CN112987233A - Wide-angle lens - Google Patents

Wide-angle lens Download PDF

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Publication number
CN112987233A
CN112987233A CN201911273285.5A CN201911273285A CN112987233A CN 112987233 A CN112987233 A CN 112987233A CN 201911273285 A CN201911273285 A CN 201911273285A CN 112987233 A CN112987233 A CN 112987233A
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lens
wide
angle
refractive power
surface facing
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CN201911273285.5A
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CN112987233B (en
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戴瑜玟
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Sintai Optical Shenzhen Co Ltd
Asia Optical Co Inc
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Sintai Optical Shenzhen Co Ltd
Asia Optical Co Inc
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Priority to CN201911273285.5A priority Critical patent/CN112987233B/en
Priority to US17/114,778 priority patent/US20210173180A1/en
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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
    • G02B13/0045—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
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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Abstract

A wide-angle lens includes a front lens group and a rear lens group. The front lens group comprises a first lens, a second lens and a third lens. The rear lens group comprises a fourth lens, a fifth lens and a sixth lens. The first lens has refractive power and comprises a concave surface facing the image side. The second lens has negative refractive power and comprises a convex surface facing the object side. The third lens element has refractive power and includes a convex surface facing the image side. The fourth lens has positive refractive power. The fifth lens has refractive power. The sixth lens has positive refractive power. The first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are sequentially arranged from an object side to an image side along an optical axis. The wide-angle lens satisfies the following conditions: -8.3. ltoreq. ffThe/f is less than or equal to 14; wherein f is the effective focal length of the wide-angle lens, ffIs the effective focal length of the front lens group.

Description

Wide-angle lens
Technical Field
The invention relates to a wide-angle lens.
Background
The current wide-angle lens cannot meet the current requirements, and needs another wide-angle lens with a new framework to meet the requirements of large field of view, miniaturization and high resolution at the same time.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a wide-angle lens, which has a large field of view, a short total length, and a high resolution, but still has good optical performance, aiming at the defect that the wide-angle lens in the prior art cannot simultaneously meet the requirements of large field of view, miniaturization, and high resolution.
The present invention provides a wide-angle lens including a front lens group and a rear lens group. The front lens group comprises a first lens, a second lens and a third lens. The rear lens group comprises a fourth lens, a fifth lens and a sixth lens. The first lens has refractive power and comprises a concave surface facing the image side. The second lens has negative refractive power and comprises a convex surface facing the object side. The third lens element has refractive power and includes a convex surface facing the image side. The fourth lens has positive refractive power. The fifth lens has refractive power. The sixth lens has a positive refractive power. The first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are sequentially arranged from an object side to an image side along an optical axis. The wide-angle lens satisfies the following conditions: -8.3. ltoreq. ffThe/f is less than or equal to 14; wherein f is the effective focal length of the wide-angle lens, ffIs the effective focal length of the front lens group.
Another wide-angle lens of the present invention includes a front lens group and a rear lens group. The front lens group comprises a first lens, a second lens and a third lens. The rear lens group comprises a fourth lens, a fifth lens and a sixth lens. The first lens has refractive power and comprises a concave surface facing the image side. The second lens has negative refractive power and comprises a convex surface facing the object side. The third lens element has refractive power and includes a convex surface facing the image side. The fourth lens has positive refractive power. The fifth lens has refractive power. The sixth lens has a positive refractive power. The first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are sequentially arranged from an object side to an image side along an optical axis. The wide-angle lens satisfies the following conditions:4mm≤f+f4less than or equal to 5 mm; wherein f is the effective focal length of the wide-angle lens, f4Is the effective focal length of the fourth lens.
Another wide-angle lens of the present invention includes a front lens group and a rear lens group. The front lens group comprises a first lens, a second lens and a third lens. The rear lens group comprises a fourth lens, a fifth lens and a sixth lens. The first lens has refractive power and comprises a concave surface facing the image side. The second lens has negative refractive power and comprises a convex surface facing the object side. The third lens element has refractive power and includes a convex surface facing the image side. The fourth lens has positive refractive power. The fifth lens has refractive power. The sixth lens has a positive refractive power. The first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are sequentially arranged from an object side to an image side along an optical axis. The wide-angle lens satisfies the following conditions: less than or equal to-5.65 mm (R)31×R32)/(R31+R32) Less than or equal to-3.8 mm; wherein R is31Is the radius of curvature, R, of the object-side surface of the third lens32Is the radius of curvature of the image-side surface of the third lens.
Another wide-angle lens of the present invention includes a front lens group and a rear lens group. The front lens group comprises a first lens, a second lens and a third lens. The rear lens group comprises a fourth lens, a fifth lens and a sixth lens. The first lens has refractive power and comprises a concave surface facing the image side. The second lens has negative refractive power and comprises a convex surface facing the object side. The third lens element has refractive power and includes a convex surface facing the image side. The fourth lens has positive refractive power. The fifth lens has refractive power. The sixth lens has a positive refractive power. The first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are sequentially arranged from an object side to an image side along an optical axis. The wide-angle lens satisfies the following conditions: 0.5 < | (CRA-MRA)/CRA | < 1.02; the CRA is a chief ray angle at the maximum image height of the wide-angle lens, and the MRA is an edge ray angle at the maximum image height of the wide-angle lens.
The fifth lens element with negative refractive power has a concave surface facing the object side and another concave surface facing the image side, and the sixth lens element with convex surface facing the object side and another convex surface facing the image side.
The wide-angle lens meets the following conditions: 45 DEG/mm < FOV/f1Less than or equal to-22 degrees/mm; vd is not less than 1051+Vd4Less than or equal to 140; wherein FOV is the field of view of the wide-angle lens, f1Is the effective focal length of the first lens, Vd1Abbe number of the first lens, Vd4Is the abbe number of the fourth lens.
The wide-angle lens meets the following conditions: -5.1 ≦ (f)2+f5) -3.6,/f; wherein f is the effective focal length of the wide-angle lens, f2Is the effective focal length of the second lens, f5Is the effective focal length of the fifth lens.
The wide-angle lens meets the following conditions: BFL/TTL is more than or equal to 0.12 and less than or equal to 0.23; TTL/T is not less than 94Less than or equal to 19; BFL is the distance between the image side surface of the lens closest to the image side and the imaging surface on the optical axis, TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, T4The thickness of the fourth lens on the optical axis.
The wide-angle lens of the invention may further include a seventh lens element disposed between the sixth lens element and the image side, the seventh lens element having positive refractive power and including a concave surface facing the object side and a convex surface facing the image side.
The wide-angle lens of the invention may further include a seventh lens element disposed between the sixth lens element and the image side, the seventh lens element having negative refractive power and including a concave surface facing the object side and another concave surface facing the image side.
When the wide-angle lens satisfies f being more than or equal to-8.3fF is less than or equal to 14 and f + f is less than or equal to 4mm4Less than or equal to 5mm, and can improve the yield.
The wide-angle lens has the following beneficial effects: the lens has the advantages of large visual field, short total length of the lens, high resolution ratio and good optical performance
Drawings
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Fig. 1 is a schematic diagram of a lens configuration and an optical path of a wide-angle lens according to a first embodiment of the present invention.
Fig. 2A, 2B, and 2C are a Longitudinal Aberration (Longitudinal Aberration) diagram, a Field Curvature (Field) diagram, and a Distortion (Distortion) diagram of the first embodiment of the wide-angle lens according to the present invention, respectively.
Fig. 3 is a schematic diagram of a lens configuration and an optical path of a wide-angle lens according to a second embodiment of the present invention.
Fig. 4A, 4B, and 4C are a longitudinal aberration diagram, a field curvature diagram, and a distortion diagram of a wide-angle lens according to a second embodiment of the present invention.
Fig. 5 is a lens configuration and optical path diagram of a wide-angle lens according to a third embodiment of the present invention.
Fig. 6A, 6B, and 6C are a longitudinal aberration diagram, a field curvature diagram, and a distortion diagram of a wide-angle lens according to a third embodiment of the present invention.
Fig. 7 is a schematic diagram of a lens configuration and an optical path of a fourth embodiment of a wide-angle lens according to the present invention.
Fig. 8A, 8B, and 8C are a longitudinal aberration diagram, a field curvature diagram, and a distortion diagram of a fourth embodiment of the wide-angle lens according to the present invention.
Fig. 9 is a schematic diagram of a lens configuration and an optical path of a fifth embodiment of a wide-angle lens according to the present invention.
Fig. 10A, 10B, and 10C are a longitudinal aberration diagram, a field curvature diagram, and a distortion diagram of a fifth embodiment of the wide-angle lens according to the present invention.
Detailed Description
The present invention provides a wide-angle lens, including: a front lens group, which comprises a first lens, a second lens and a third lens; the rear lens group comprises a fourth lens, a fifth lens and a sixth lens; the first lens has refractive power, the first lensA lens having a concave surface facing the image side; the second lens has negative refractive power and comprises a convex surface facing the object side; the third lens element with refractive power has a convex surface facing the image side; the fourth lens has positive refractive power; the fifth lens has refractive power; the sixth lens has positive refractive power; the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are sequentially arranged from an object side to an image side along an optical axis; the wide-angle lens satisfies the following conditions: -8.3. ltoreq. ffThe/f is less than or equal to 14; wherein f is the effective focal length of the wide-angle lens, ffIs the effective focal length of the front lens group.
The present invention provides another wide-angle lens, including: a front lens group, which comprises a first lens, a second lens and a third lens; the rear lens group comprises a fourth lens, a fifth lens and a sixth lens; the first lens has refractive power and comprises a concave surface facing the image side; the second lens has negative refractive power and comprises a convex surface facing the object side; the third lens element with refractive power has a convex surface facing the image side; the fourth lens has positive refractive power; the fifth lens has refractive power; the sixth lens has positive refractive power; the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are sequentially arranged from an object side to an image side along an optical axis; the wide-angle lens satisfies the following conditions: f + f is not less than 4mm4Less than or equal to 5 mm; wherein f is the effective focal length of the wide-angle lens, f4Is the effective focal length of the fourth lens.
The present invention provides another wide-angle lens, including: a front lens group, which comprises a first lens, a second lens and a third lens; the rear lens group comprises a fourth lens, a fifth lens and a sixth lens; the first lens has refractive power and comprises a concave surface facing the image side; the second lens has negative refractive power and comprises a convex surface facing the object side; the third lens element with refractive power has a convex surface facing the image side; the fourth lens has positive refractive power; the fifth lens has refractive power; the sixth lens has positive refractive power; first lens, second lens, third lens and third lensThe fourth lens element, the fifth lens element and the sixth lens element are arranged along an optical axis in order from an object side to an image side; the wide-angle lens satisfies the following conditions: less than or equal to-5.65 mm (R)31×R32)/(R31+R32) Less than or equal to-3.8 mm; wherein R is31Is the radius of curvature, R, of the object-side surface of the third lens32Is the radius of curvature of the image-side surface of the third lens.
The present invention provides another wide-angle lens, including: a front lens group, which comprises a first lens, a second lens and a third lens; the rear lens group comprises a fourth lens, a fifth lens and a sixth lens; the first lens has refractive power and comprises a concave surface facing the image side; the second lens has negative refractive power and comprises a convex surface facing the object side; the third lens element with refractive power has a convex surface facing the image side; the fourth lens has positive refractive power; the fifth lens has refractive power; the sixth lens has positive refractive power; the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are sequentially arranged from an object side to an image side along an optical axis; the wide-angle lens satisfies the following conditions: 0.5 < | (CRA-MRA)/CRA | < 1.02; the CRA is a chief ray angle at the maximum image height of the wide-angle lens, and the MRA is an edge ray angle at the maximum image height of the wide-angle lens.
Please refer to the following tables, table one, table two, table four, table five, table seven, table eight, table ten, table eleven, table thirteen and table fourteen, wherein table one, table four, table seven, table ten and table thirteen are related parameter tables of the lenses according to the first to fifth embodiments of the wide-angle lens of the present invention, respectively, and table two, table five, table eight, table eleven and table fourteen are related parameter tables of aspheric surfaces of aspheric lenses of table one, table four, table seven, table ten and table thirteen, respectively.
FIGS. 1, 3, 5, 7 and 9 are schematic diagrams of lens configurations and optical paths of first, second, third, fourth and fifth embodiments of the wide-angle lens of the invention, respectively, wherein the front lens group LG1f、LG2f、LG3f、LG4f、LG5fComprises a first lens L11, a second lens L12, a third lens L13, a first lens L21 and a second lensA mirror L22 third lens L23, a first lens L31 second lens L32 third lens L33, a first lens L41 second lens L42 third lens L43, a first lens L51 second lens L52 third lens L53, and a rear lens group LG1r、LG2r、LG3r、LG4r、LG5rThe lens group comprises a fourth lens L14, a fifth lens L15, a sixth lens L16, a fourth lens L24, a fifth lens L25, a sixth lens L26, a fourth lens L34, a fifth lens L35, a sixth lens L36, a fourth lens L44, a fifth lens L45, a sixth lens L46, a seventh lens L47, a fourth lens L54, a fifth lens L55, a sixth lens L56 and a seventh lens L57.
The first lenses L11, L21, L31, L41, and L51 are meniscus lenses having negative refractive power, and are made of glass material, and the object side surfaces S11, S21, S31, S41, and S51 are convex surfaces, the image side surfaces S12, S22, S32, S42, and S52 are concave surfaces, and the object side surfaces S11, S21, S31, S41, and S51 and the image side surfaces S12, S22, S32, S42, and S52 are spherical surfaces.
The second lenses L12, L22, L32, L42, and L52 are meniscus lenses having negative refractive power, and are made of plastic material, and the object side surfaces S13, S23, S33, S43, and S53 are convex surfaces, the image side surfaces S14, S24, S34, S44, and S54 are concave surfaces, and the object side surfaces S13, S23, S33, S43, and S53 and the image side surfaces S14, S24, S34, S44, and S54 are aspheric surfaces.
The third lenses L13, L23, L33, L43, and L53 have positive refractive power, are made of plastic material, and have convex image-side surfaces S16, S26, S36, S46, and S56, and aspheric surfaces on the image-side surfaces S15, S25, S35, S45, S55 and the image-side surfaces S16, S26, S36, S46, and S56.
The fourth lenses L14, L24, L34, L44, and L54 are biconvex lenses having positive refractive power, and are made of glass material, and the object side surfaces S18, S28, S38, S48, and S58 are convex surfaces, the image side surfaces S19, S29, S39, S49, and S59 are convex surfaces, and the object side surfaces S18, S28, S38, S48, and S58 and the image side surfaces S19, S29, S39, S49, and S59 are spherical surfaces.
The fifth lenses L15, L25, L35, L45, and L55 are biconcave lenses having negative refractive power, and are made of plastic material, wherein the object side surfaces S110, S210, S310, S410, and S510 are concave surfaces, the image side surfaces S111, S211, S311, S411, and S511 are concave surfaces, and the object side surfaces S110, S210, S310, S410, and S510 and the image side surfaces S111, S211, S311, S411, and S511 are aspheric surfaces.
The sixth lenses L16, L26, L36, L46, and L56 are biconvex lenses having positive refractive power, and are made of plastic materials, wherein the object-side surfaces S112, S212, S312, S412, and S512 are convex surfaces, the image-side surfaces S113, S213, S313, S413, and S513 are convex surfaces, and the object-side surfaces S112, S212, S312, S412, and S512 and the image-side surfaces S113, S213, S313, S413, and S513 are aspheric surfaces.
In addition, the wide- angle lenses 1, 2, 3, 4, 5 at least satisfy one of the following conditions:
-8.3≤ff/f≤14 (1)
4mm≤f+f4≤5mm (2)
-5.65mm≤(R31×R32)/(R31+R32)≤-3.8mm (3)
0.5＜|(CRA-MRA)/CRA|＜1.02 (4)
45 DEG/mm < FOV/f1Less than or equal to-22 degree/mm (5)
105≤Vd1+Vd4≤140 (6)
-5.1≤(f2+f5)/f＜-3.6 (7)
0.12≤BFL/TTL≤0.23 (8)
9≤TTL/T4≤19 (9)
Where f is the effective focal length of the wide-angle lenses 1, 2, 3, 4, 5 in the first to fifth embodiments, and f1Effective focal lengths of the first lenses L11, L21, L31, L41, L51, f in the first to fifth embodiments2Effective focal lengths of the second lenses L12, L22, L32, L42, L52, f in the first to fifth embodiments4Effective focal lengths of the fourth lenses L14, L24, L34, L44, L54, f in the first to fifth embodiments5Effective focal lengths of the fifth lenses L15, L25, L35, L45, L55, f in the first to fifth embodimentsfIn the first to fifth embodiments, the front lens group LG1f、LG2f、LG3f、LG4f、LG5fIs effectiveFocal length, R31In the first to fifth embodiments, the radii of curvature, R45, S55, of the object-side surfaces S15, S25, S35, S45, and S55 of the third lenses L13, L23, L33, L43, and L5332In the first to fifth embodiments, the curvature radius of the image-side surface S16, S26, S36, S46, S56 of the third lens L13, L23, L33, L43, L53, the CRA is the chief ray angle at the maximum image height of the wide-angle lens 1, 2, 3, 4, 5 in the first to fifth embodiments, the MRA is the marginal ray angle at the maximum image height of the wide-angle lens 1, 2, 3, 4, 5 in the first to fifth embodiments, the FOV is the field of view of the wide-angle lens 1, 2, 3, 4, Vd 5 in the first to fifth embodiments, and the Vd is the central line of1Abbe numbers, Vd, of the first lenses L11, L21, L31, L41, L51 in the first to fifth embodiments4In the first to fifth embodiments, the abbe numbers of the fourth lenses L14, L24, L34, L44 and L54, the BFL is the distance between the image side surfaces S113, S213, S313, S415 and S515 of the lenses L16, L26, L36, L47 and L57 closest to the image side to the imaging surfaces IMA1, IMA2, IMA3, IMA4 and IMA5 on the optical axes OA1, OA2, OA3, OA4 and OA5 respectively in the first to fifth embodiments, and the TTL is the distance between the first lenses L5, L5 and the object side surfaces of the lenses L5, S5 and S5 to the imaging surfaces IMA5, L5, IMA5, OA5 and OA5 respectively on the optical axes OA5, OA5 respectively in the first to fifth embodiments, BFL 5, and the distances between the imaging surfaces IMA5 and the imaging surfaces OA5 respectively4In the first to fifth embodiments, the fourth lenses L14, L24, L34, L44, and L54 have thicknesses on the optical axes OA1, OA2, OA3, OA4, and OA 5. The wide- angle lenses 1, 2, 3, 4 and 5 can effectively shorten the total length of the lenses, effectively increase the field of view, effectively improve the resolution, effectively correct aberration and effectively correct chromatic aberration.
Satisfies the condition (1): -8.3. ltoreq. ffAnd/f is less than or equal to 14, so that the relative illumination of the wide-angle lens can be improved.
Satisfies the condition (2): f + f is not less than 4mm4The refractive power of the fourth lens can be controlled to be less than or equal to 5mm, so that the refractive power of the fourth lens is not too large, and the processing and the manufacturing of the fourth lens are facilitated.
Satisfies the condition (3): less than or equal to-5.65 mm (R)31×R32)/(R31+R32) The manufacturing sensitivity of the third lens can be reduced to be less than or equal to-3.8 mm, so that the manufacturing yield of the wide-angle lens is improved.
Satisfies the condition (4): 0.5 < | (CRA-MRA)/CRA | is less than 1.02, and the angle of the marginal light at the maximum image height can be adjusted to improve the illumination and the image quality of the wide-angle lens.
Satisfies the condition (5): 45 DEG/mm < FOV/f1The refractive power of the first lens is controlled to be less than or equal to-22 degrees/mm, so that the refractive power of the first lens is not too large, and the processing and manufacturing of the first lens are facilitated.
Satisfies the condition (6): vd is not less than 1051+Vd4Less than or equal to 140, can reduce the chromatic aberration of the wide-angle lens and improve the image quality.
Satisfies the condition (7): -5.1 ≦ (f)2+f5) And/f is less than-3.6, the manufacturing sensitivity of the wide-angle lens can be reduced, and the image quality is improved.
Satisfies the condition (8): BFL/TTL is more than or equal to 0.12 and less than or equal to 0.23, the back focal length can be increased, and the assembly and the manufacture of the wide-angle lens are facilitated.
Satisfies the condition (9): TTL/T is not less than 94Less than or equal to 19, can effectively reduce the influence of temperature change on the image quality, and is beneficial to the manufacture of wide-angle lenses.
A first embodiment of the wide-angle lens of the present invention will now be described in detail. Referring to FIG. 1, the wide-angle lens 1 includes, in order from an object side to an image side along an optical axis OA1, a front lens group LG1fA diaphragm ST1, and a rear lens group LG1rA filter OF1 and a cover glass CG 1. Front lens group LG1fIncludes a first lens L11, a second lens L12, and a third lens L13. Rear lens group LG1rIncludes a fourth lens L14, a fifth lens L15, and a sixth lens L16. In imaging, light from the object side is finally imaged on the imaging surface IMA 1. According to [ embodiments ] the first to twelfth paragraphs, wherein:
the third lens element L13 is a biconvex lens element, and its object-side surface S15 is a convex surface;
the filter OF1 has an object-side surface S114 and an image-side surface S115 both being planar;
the object-side surface S116 and the image-side surface S117 of the cover glass CG1 are both planar;
by using the design that the lens, the diaphragm ST1 and at least one of the conditions (1) to (9) are satisfied, the wide-angle lens 1 can effectively shorten the total length of the lens, effectively increase the field of view, effectively improve the resolution, effectively correct the aberration, and effectively correct the chromatic aberration.
Table one is a table of relevant parameters of each lens of the wide-angle lens 1 in fig. 1.
Watch 1
Figure BDA0002314825070000091
The aspherical surface sag z of the aspherical lens in table i is obtained by the following equation:
z＝ch2/{1+[1-(k+1)c2h2]1/2}+Ah4+Bh6+Ch8+Dh10+Eh12+Fh14+Gh16
wherein:
c: a curvature;
h: the vertical distance from any point on the surface of the lens to the optical axis;
k: a cone coefficient;
a to G: an aspheric surface coefficient.
The second table is a table of the relevant parameters of the aspheric surface of the aspheric lens in the first table, where k is the Conic coefficient (Conic Constant) and A-G are aspheric coefficients.
Watch two
Figure BDA0002314825070000101
Table three shows the correlation parameter values of the wide-angle lens 1 of the first embodiment and the calculated values corresponding to the conditions (1) to (9), and it can be seen from table three that the wide-angle lens 1 of the first embodiment can satisfy the requirements of the conditions (1) to (9).
Watch III
Figure BDA0002314825070000102
In addition, the optical performance of the wide-angle lens 1 of the first embodiment can also meet the requirements.
As can be seen from fig. 2A, the longitudinal aberration of the wide-angle lens 1 of the first embodiment is between-0.01 mm and 0.025 mm.
As can be seen from fig. 2B, the field curvature of the wide-angle lens 1 of the first embodiment is between-0.02 mm to 0.005 mm.
As can be seen from fig. 2C, the wide-angle lens 1 of the first embodiment has a distortion of-30% to 0%.
It is apparent that the longitudinal aberration, curvature of field, and distortion of the wide-angle lens 1 of the first embodiment can be effectively corrected, thereby obtaining better optical performance.
Referring to fig. 3, fig. 3 is a schematic diagram of a lens configuration and an optical path of a wide-angle lens according to a second embodiment of the invention. The wide-angle lens 2 comprises, in order from object side to image side along an optical axis OA2, a front lens group LG2fA diaphragm ST2, and a rear lens group LG2rA filter OF2 and a cover glass CG 2. Front lens group LG2fIncludes a first lens L21, a second lens L22, and a third lens L23. Rear lens group LG2rIncludes a fourth lens L24, a fifth lens L25, and a sixth lens L26. In imaging, light from the object side is finally imaged on the imaging surface IMA 2. According to [ embodiments ] the first to twelfth paragraphs, wherein:
the third lens element L23 is a biconvex lens element, and its object-side surface S25 is a convex surface;
the filter OF2 has an object-side surface S214 and an image-side surface S215 that are both planar;
the object side surface S216 and the image side surface S217 of the protective glass CG2 are both planes;
by using the design that the lens, the diaphragm ST2 and at least one of the conditions (1) to (9) are satisfied, the wide-angle lens 2 can effectively shorten the total length of the lens, effectively increase the field of view, effectively improve the resolution, effectively correct the aberration, and effectively correct the chromatic aberration.
Table four is a table of the relevant parameters of each lens of the wide-angle lens 2 in fig. 3.
Watch four
Figure BDA0002314825070000111
Figure BDA0002314825070000121
The definition of the aspherical surface sag z of the aspherical lens in table four is the same as that of the aspherical lens in table one of the first embodiment, and is not repeated herein.
Table V is a table of parameters related to the aspherical surface of the aspherical lens of Table IV, where k is a Conic coefficient (Conic Constant) and A to G are aspherical coefficients.
Watch five
Figure BDA0002314825070000122
Table six shows the relevant parameter values of the wide-angle lens 2 of the second embodiment and the calculated values corresponding to the conditions (1) to (9), and it can be seen from table six that the wide-angle lens 2 of the second embodiment can satisfy the requirements of the conditions (1) to (9).
Watch six
Figure BDA0002314825070000131
In addition, the optical performance of the wide-angle lens 2 of the second embodiment may also be satisfactory.
As can be seen from fig. 4A, the longitudinal aberration of the wide-angle lens 2 of the second embodiment is between-0.005 mm and 0.005 mm.
As can be seen from fig. 4B, the field curvature of the wide-angle lens 2 of the second embodiment is between-0.035 mm and 0.01 mm.
As can be seen from fig. 4C, the wide-angle lens 2 of the second embodiment has a distortion of-15% to 0%.
It is apparent that the longitudinal aberration, curvature of field, and distortion of the wide-angle lens 2 of the second embodiment can be effectively corrected, thereby obtaining better optical performance.
Referring to fig. 5, fig. 5 is a schematic diagram of a lens configuration and an optical path of a wide-angle lens according to a third embodiment of the invention. The wide-angle lens 3 includes, in order from an object side to an image side along an optical axis OA3, a front lens group LG3fA diaphragm ST3, and a rear lens group LG3rA filter OF3 and a cover glass CG 3. Front lens group LG3fIncludes a first lens L31, a second lens L32, and a third lens L33. Rear lens group LG3rIncludes a fourth lens L34, a fifth lens L35, and a sixth lens L36. In imaging, light from the object side is finally imaged on the imaging surface IMA 3. According to [ embodiments ] the first to twelfth paragraphs, wherein:
the third lens L33 is a meniscus lens with the object side S35 being concave;
the filter OF3 has an object-side surface S314 and an image-side surface S315 that are both planar;
the object-side surface S316 and the image-side surface S317 of the cover glass CG3 are both planar;
by using the design that the lens, the diaphragm ST3 and at least one of the conditions (1) to (9) are satisfied, the wide-angle lens 3 can effectively shorten the total length of the lens, effectively increase the field of view, effectively improve the resolution, effectively correct the aberration, and effectively correct the chromatic aberration.
Table seven is a table of the relevant parameters of each lens of the wide-angle lens 3 in fig. 5.
Watch seven
Figure BDA0002314825070000132
Figure BDA0002314825070000141
The definition of the aspherical surface sag z of the aspherical lens in table seven is the same as that of the aspherical lens in table one of the first embodiment, and is not repeated herein.
Table eight is a table of parameters related to the aspherical surfaces of the aspherical lenses of Table seven, wherein k is a Conic coefficient (Conic Constant) and A to G are aspherical coefficients.
Table eight
Figure BDA0002314825070000142
Figure BDA0002314825070000151
Table nine shows the values of the parameters associated with the wide-angle lens 3 of the third embodiment and the calculated values corresponding to the conditions (1) to (9), and it can be seen from table nine that the wide-angle lens 3 of the third embodiment can satisfy the requirements of the conditions (1) to (9).
Watch nine
Figure BDA0002314825070000152
In addition, the optical performance of the wide-angle lens 3 of the third embodiment may also be satisfactory.
As can be seen from fig. 6A, the longitudinal aberration of the wide-angle lens 3 of the third embodiment is between-0.005 mm and 0.025 mm.
As can be seen from fig. 6B, the field curvature of the wide-angle lens 3 of the third embodiment is between-0.025 mm and 0.01 mm.
As can be seen from fig. 6C, the wide-angle lens 3 of the third embodiment has a distortion of-30% to 0%.
It is apparent that the longitudinal aberration, curvature of field, and distortion of the wide-angle lens 3 of the third embodiment can be effectively corrected, thereby obtaining better optical performance.
Referring to fig. 7, fig. 7 is a schematic diagram illustrating a lens configuration and an optical path of a wide-angle lens according to a fourth embodiment of the invention. The wide-angle lens 4 includes, in order from an object side to an image side along an optical axis OA4, a front lens group LG4fA diaphragm ST4, and a rear lens group LG4rA filter OF4 and a cover glass CG 4. Front lens group LG4fComprises a first lens L41 and a second lens L42And a third lens L43. Rear lens group LG4rIncludes a fourth lens L44, a fifth lens L45, a sixth lens L46, and a seventh lens L47. In imaging, light from the object side is finally imaged on the imaging surface IMA 4. According to [ embodiments ] the first to twelfth paragraphs, wherein:
the third lens element L43 is a biconvex lens element, and its object-side surface S45 is a convex surface;
the seventh lens element L47 is a meniscus lens element with positive refractive power and made of plastic material, wherein the object-side surface S414 is concave, the image-side surface S415 is convex, and both the object-side surface S414 and the image-side surface S415 are aspheric surfaces.
The optical filter OF4 has an object-side surface S416 and an image-side surface S417 which are both planar;
the object side surface S418 and the image side surface S419 of the cover glass CG4 are both planar;
by using the design that the lens, the diaphragm ST4 and at least one of the conditions (1) to (9) are satisfied, the wide-angle lens 4 can effectively shorten the total length of the lens, effectively increase the field of view, effectively improve the resolution, effectively correct the aberration, and effectively correct the chromatic aberration.
Table ten is a table of the relevant parameters of each lens of the wide-angle lens 4 in fig. 7.
Watch ten
Figure BDA0002314825070000161
Figure BDA0002314825070000171
The definition of the aspheric surface sag z of the aspheric lens in table ten is the same as that of the aspheric lens in the first embodiment, and is not repeated herein.
Table eleven is a table of parameters related to the aspherical surface of the aspherical lens of Table eleven, where k is a Conic coefficient (Conic Constant) and A to G are aspherical coefficients.
Watch eleven
Figure BDA0002314825070000172
Table twelve shows the correlation parameter values of the wide-angle lens 4 of the fourth embodiment and the calculated values corresponding to the conditions (1) to (9), and it can be seen from table twelve that the wide-angle lens 4 of the fourth embodiment can satisfy the requirements of the conditions (1) to (9).
Watch twelve
Figure BDA0002314825070000173
Figure BDA0002314825070000181
In addition, the optical performance of the wide-angle lens 4 of the fourth embodiment may also be satisfactory.
As can be seen from fig. 8A, the wide-angle lens 4 of the fourth embodiment has a longitudinal aberration between-0.01 mm and 0.035 mm.
As can be seen from fig. 8B, the field curvature of the wide-angle lens 4 of the fourth embodiment is between-0.015 mm and 0.025 mm.
As can be seen from fig. 8C, the wide-angle lens 4 of the fourth embodiment has a distortion of-30% to 0%.
It is apparent that the longitudinal aberration, curvature of field, and distortion of the wide-angle lens 4 of the fourth embodiment can be effectively corrected, thereby obtaining better optical performance.
Referring to fig. 9, fig. 9 is a schematic diagram of a lens configuration and an optical path of a wide-angle lens according to a fifth embodiment of the invention. The wide-angle lens 5 comprises, in order from an object side to an image side along an optical axis OA5, a front lens group LG5fA diaphragm ST5, and a rear lens group LG5rA filter OF5 and a cover glass CG 5. Front lens group LG5fIncludes a first lens L51, a second lens L52, and a third lens L53. Rear lens group LG5rIncludes a fourth lens L54, a fifth lens L55, a sixth lens L56, and a seventh lens L57. When imaging, the light from the object side is finally imaged on the imaging surface IMA5. According to [ embodiments ] the first to twelfth paragraphs, wherein:
the third lens element L53 is a biconvex lens element, and its object-side surface S55 is a convex surface;
the seventh lens element L57 is a biconcave lens element with negative refractive power and made of plastic material, wherein the object-side surface S514 is concave, the image-side surface S515 is concave, and both the object-side surface S514 and the image-side surface S515 are aspheric surfaces.
The optical filter OF5 has an object-side surface S516 and an image-side surface S517 which are both planar;
the object side surface S518 and the image side surface S519 of the protective glass CG5 are both planes;
by using the design that the lens, the diaphragm ST5 and at least one of the conditions (1) to (9) are satisfied, the wide-angle lens 5 can effectively shorten the total length of the lens, effectively increase the field of view, effectively improve the resolution, effectively correct the aberration, and effectively correct the chromatic aberration.
Table thirteen is a table of relevant parameters of each lens of the wide-angle lens 5 in fig. 9.
Watch thirteen
Figure BDA0002314825070000182
Figure BDA0002314825070000191
The definition of the aspherical surface sag z of the aspherical lens in table thirteen is the same as that of the aspherical lens in table one of the first embodiment, and is not repeated herein.
TABLE fourteen is a table of relevant parameters of the aspheric surfaces of the aspheric lenses in TABLE thirteen, where k is the Conic coefficient (Conic Constant) and A-G are aspheric coefficients.
Table fourteen
Figure BDA0002314825070000192
Figure BDA0002314825070000201
Table fifteen shows the relevant parameter values of the wide-angle lens 5 of the fifth embodiment and the calculated values corresponding to the conditions (1) to (9), and it can be seen from table fifteen that the wide-angle lens 5 of the fifth embodiment can satisfy the requirements of the conditions (1) to (9).
Fifteen items of table
Figure BDA0002314825070000202
In addition, the optical performance of the wide-angle lens 5 of the fifth embodiment can also be satisfied.
As can be seen from fig. 10A, the longitudinal aberration of the wide-angle lens 5 of the fifth embodiment is between-0.005 mm and 0.025 mm. As can be seen from fig. 10B, the field curvature of the wide-angle lens 5 of the fifth embodiment is between-0.025 mm and 0.005 mm. As can be seen from fig. 10C, the wide-angle lens 5 of the fifth embodiment has a distortion of-30% to 0%.
It is apparent that the longitudinal aberration, curvature of field, and distortion of the wide-angle lens 5 of the fifth embodiment can be effectively corrected, thereby obtaining better optical performance.
When the wide-angle lens satisfies f being more than or equal to-8.3fF is less than or equal to 14 and f + f is less than or equal to 4mm4Less than or equal to 5mm, and can improve the yield.

Claims (10)

1. A wide-angle lens, comprising:
a front lens group including a first lens, a second lens and a third lens; and
a rear lens group including a fourth lens, a fifth lens and a sixth lens;
the first lens has refractive power and comprises a concave surface facing to the image side;
the second lens has negative refractive power and comprises a convex surface facing the object side;
the third lens element has refractive power and comprises a convex surface facing the image side;
the fourth lens has positive refractive power;
the fifth lens has refractive power;
the sixth lens has positive refractive power;
the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are sequentially disposed along an optical axis from an object side to an image side;
the wide-angle lens satisfies the following conditions:
-8.3≤ff/f≤14；
wherein f is the effective focal length of the wide-angle lens, ffIs the effective focal length of the front lens group.
2. A wide-angle lens, comprising:
a front lens group including a first lens, a second lens and a third lens; and
a rear lens group including a fourth lens, a fifth lens and a sixth lens;
the first lens has refractive power and comprises a concave surface facing to the image side;
the second lens has negative refractive power and comprises a convex surface facing the object side;
the third lens element has refractive power and comprises a convex surface facing the image side;
the fourth lens has positive refractive power;
the fifth lens has refractive power;
the sixth lens has positive refractive power;
the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are sequentially disposed along an optical axis from an object side to an image side;
the wide-angle lens satisfies the following conditions:
4mm≤f+f4≤5mm；
wherein f is the effective focal length of the wide-angle lensDistance, f4Is the effective focal length of the fourth lens.
3. The wide-angle lens of any one of claims 1 to 2, wherein the wide-angle lens satisfies the following condition:
-5.65mm≤(R31×R32)/(R31+R32)≤-3.8mm；
wherein R is31Is the radius of curvature, R, of the object-side surface of the third lens32The radius of curvature of the image-side surface of the third lens.
4. The wide-angle lens of any one of claims 1 to 2, wherein the wide-angle lens satisfies the following condition:
0.5＜|(CRA-MRA)/CRA|＜1.02；
the CRA is a chief ray angle at the maximum image height of the wide-angle lens, and the MRA is an edge ray angle at the maximum image height of the wide-angle lens.
5. The wide-angle lens of any one of claims 1 to 2,
the first lens has negative refractive power, and further comprises a convex surface facing the object side;
the second lens element further includes a concave surface facing the image side;
the third lens element with negative refractive power has a convex surface facing the object side or a concave surface facing the object side;
the fourth lens element includes a convex surface facing the object side and another convex surface facing the image side;
the fifth lens element with negative refractive power comprises a concave surface facing the object side and another concave surface facing the image side; and
the sixth lens element includes a convex surface facing the object side and another convex surface facing the image side.
6. The wide-angle lens of any one of claims 1 to 2, wherein the wide-angle lens satisfies the following condition:
45 DEG/mm < FOV/f1Less than or equal to-22 degrees/mm;
105≤Vd1+Vd4≤140；
wherein FOV is the field of view of the wide-angle lens, f1Is the effective focal length of the first lens, Vd1Is Abbe number, Vd, of the first lens4Is the abbe number of the fourth lens.
7. The wide-angle lens of any one of claims 1 to 2, wherein the wide-angle lens satisfies the following condition:
-5.1≤(f2+f5)/f＜-3.6；
wherein f is the effective focal length of the wide-angle lens, f2Is the effective focal length of the second lens, f5Is the effective focal length of the fifth lens.
8. The wide-angle lens of any one of claims 1 to 2, wherein the wide-angle lens satisfies the following condition:
0.12≤BFL/TTL≤0.23；
9≤TTL/T4≤19；
wherein BFL is the distance between the image side surface of the lens closest to the image side and the image plane on the optical axis, TTL is the distance between the object side surface of the first lens and the image plane on the optical axis, T4The thickness of the fourth lens element on the optical axis.
9. The wide-angle lens assembly as claimed in any one of claims 1 to 2, further comprising a seventh lens element disposed between the sixth lens element and the image side, the seventh lens element having a positive refractive power, the seventh lens element comprising a concave surface facing the object side and a convex surface facing the image side.
10. The wide-angle lens assembly as claimed in any one of claims 1 to 2, further comprising a seventh lens element disposed between the sixth lens element and the image side, the seventh lens element having a negative refractive power, the seventh lens element comprising a concave surface facing the object side and another concave surface facing the image side.
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