CN115268014A - Wide-angle lens - Google Patents
Wide-angle lens Download PDFInfo
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- CN115268014A CN115268014A CN202110472094.2A CN202110472094A CN115268014A CN 115268014 A CN115268014 A CN 115268014A CN 202110472094 A CN202110472094 A CN 202110472094A CN 115268014 A CN115268014 A CN 115268014A
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- 230000005499 meniscus Effects 0.000 claims abstract description 21
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- 238000010586 diagram Methods 0.000 description 16
- 238000003384 imaging method Methods 0.000 description 7
- 239000011521 glass Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000006059 cover glass Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
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- 101100233058 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) IMA2 gene Proteins 0.000 description 1
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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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
- G02B13/18—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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Abstract
A wide-angle lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens element has refractive power and includes a concave surface facing the image side. The second lens has refractive power and is a meniscus lens. The third lens has a positive refractive power. The fourth lens has positive refractive power. The fifth lens has refractive power and is a meniscus lens. The sixth lens has refractive power. The seventh lens element with positive refractive power has a concave surface facing the image side. The first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element are sequentially disposed along an optical axis from an object side to an image side.
Description
Technical Field
The invention relates to a wide-angle lens.
Background
The development trend of the existing wide-angle lens is continuously towards the large field of view, and along with different application requirements, the existing wide-angle lens also needs to have the characteristics of large aperture, high resolution and environmental temperature change resistance.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a wide-angle lens, which has a large field of view, a small aperture value, a high resolution, and resistance to ambient temperature change, 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, large aperture, high resolution, and resistance to ambient temperature change.
The present invention provides a wide-angle lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens element has refractive power and includes a concave surface facing the image side. The second lens has refractive power and is a meniscus lens. The third lens has positive refractive power. The fourth lens has positive refractive power. The fifth lens has refractive power and is a meniscus lens. The sixth lens has refractive power. The seventh lens element with positive refractive power has a concave surface facing the image side. The first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element are sequentially arranged along an optical axis from an object side to an image side.
The invention provides another wide-angle lens which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens element has refractive power and includes a concave surface facing the image side. The second lens has refractive power and is a meniscus lens. The third lens has positive refractive power. The fourth lens has positive refractive power and comprises a concave surface facing the object side. The fifth lens has refractive power and is a meniscus lens. The sixth lens has a positive refractive power. The seventh 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, the sixth lens element and the seventh lens element are sequentially arranged along an optical axis from an object side to an image side.
The first lens has negative refractive power, the second lens has negative refractive power, and the sixth lens has positive refractive power.
The first lens element can further include a convex surface facing the object side, and the second lens element can include a concave surface facing the object side and a convex surface facing the image side.
The first lens element can further include a convex surface facing the object side, and the second lens element can include a convex surface facing the object side and a concave surface facing the image side.
The sixth lens element includes a convex surface or a concave surface facing the object side.
The fourth lens element includes a convex surface facing the image side, the sixth lens element includes a convex surface facing the image side, and the seventh lens element includes a convex surface facing the object side.
The fifth lens element has positive refractive power and includes a convex surface facing the object side and a concave surface facing the image side.
The fifth lens element has negative refractive power and includes a concave surface facing the object side and a convex surface facing the image side.
Wherein the wide-angle lens further comprises a stop disposed between the second lens and the fourth lens, and the wide-angle lens at least satisfies one of the following conditions: 65mm2X degree is less than or equal to ((f is multiplied by the FOV multiplied by the pi)/360) x TTL is less than or equal to 70mm2Degree of x; L1D/R12Less than or equal to 1.8; L2T1/L2T2 is more than or equal to 0.4 and less than or equal to 0.8; nd2 is more than or equal to 1.54 and less than or equal to 1.68; nd5 is more than or equal to 1.54 and less than or equal to 1.68; nd3 xf 3 is not less than 9mm and not more than 18mm; nd4 xf 4 is more than or equal to 25mm and less than or equal to 55mm; ndLG multiplied by fLG which is more than or equal to 20mm and less than or equal to 40mm;13 mm-fAS 2 is less than or equal to 40mm;3.5 mm-fAS-5.5 mm; wherein f is an effective focal length of the wide-angle lens, f3 is an effective focal length of the third lens, f4 is an effective focal length of the fourth lens, fLG is an effective focal length of a lens closest to the image side, the FOV is a field of view of the wide-angle lens, TTL is an axial distance between an object side surface and an image plane of the first lens, L1D is an optical effective diameter of an image side surface of the first lens, and R is an optical effective diameter of the image side surface of the first lens12Is the radius of curvature of the image-side surface of the first lens element, L2T1 is the thickness of the second lens element on the optical axis, L2T2 is the edge thickness of the second lens element, nd2 is the refractive index of the second lens element, the refractive index of the Nd3 third lens element, the refractive index of the Nd4 fourth lens element, nd5 is the refractive index of the fifth lens element, ndLG is the refractive index of the lens element closest to the image side, fAS is the effective focal length of the second lens element from the aperture toward the image side, fAS is the combined effective focal length of all lenses from the aperture to the image side.
The wide-angle lens has the advantages of larger field of view, smaller aperture value, higher resolution and resistance to environmental temperature change, but still has 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 lens arrangement of a first embodiment of a wide-angle lens according to the present invention.
Fig. 2A, 2B, 2C, and 2D are a Longitudinal Aberration (Longitudinal Aberration) diagram, a Field Curvature (Field Curvature) diagram, a Distortion (Distortion) diagram, and a transverse chromatic Aberration (lareal Color) diagram, respectively, of the first embodiment of the wide-angle lens according to the present invention.
Fig. 3 is a lens arrangement diagram of a second embodiment of a wide-angle lens according to the present invention.
Fig. 4A, 4B, 4C, and 4D are a longitudinal aberration diagram, a field curvature diagram, a distortion diagram, and a lateral aberration diagram, respectively, of a second embodiment of the wide-angle lens according to the invention.
Fig. 5 is a lens arrangement diagram of a third embodiment of a wide-angle lens according to the present invention.
Fig. 6A, 6B, 6C and 6D are a longitudinal aberration diagram, a field curvature diagram, a distortion diagram and a lateral aberration diagram of a third embodiment of the wide-angle lens according to the invention.
Detailed Description
The present invention provides a wide-angle lens, including: the first lens has refractive power and comprises a concave surface facing the image side; the second lens has refractive power and is a meniscus lens; the third lens has positive refractive power; the fourth lens has positive refractive power; the fifth lens has refractive power and is a meniscus lens; the sixth lens has refractive power; the seventh lens has positive refractive power and comprises a concave surface facing the image side; the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element are sequentially arranged along an optical axis from an object side to an image side.
The present invention provides another wide-angle lens, including: the first lens has refractive power and comprises a concave surface facing the image side; the second lens has refractive power and is a meniscus lens; the third lens has positive refractive power; the fourth lens has positive refractive power and comprises a concave surface facing the object side; the fifth lens has refractive power and is a meniscus lens; the sixth lens has positive refractive power; and the seventh 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, the sixth lens element and the seventh lens element are sequentially arranged along an optical axis from an object side to an image side.
Please refer to the following tables i, ii, iv, v, seventh and eighth, wherein the tables i, iv and seventh are the related parameter tables of the lenses according to the first to third embodiments of the wide-angle lens of the present invention, respectively, and the tables ii, iv and eighth are the related parameter tables of the aspheric surfaces of the aspheric lenses of the first, fourth and seventh, respectively, in the following embodiments, the aspheric surface sag z of the aspheric lens is obtained by the following formula: z = ch2/{1+[1-(k+1)c2h2]1/2}+Ah4+Bh6+Ch8+Dh10+Eh12Wherein: c is curvature, h is the perpendicular distance from any point of the lens surface to the optical axis, k is Conic coefficient (Conic Constant), A-E are aspheric coefficients, and E represents scientific notation, E-03 represents 10-3。
Fig. 1, 3 and 5 are schematic lens configurations of the first, second and third embodiments of the wide-angle lens of the present invention, wherein the first lenses L11, L21 and L31 are meniscus lenses with negative refractive power, and are made of glass material, and the object side surfaces S11, S21 and S31 are convex surfaces, the image side surfaces S12, S22 and S32 are concave surfaces, and the object side surfaces S11, S21 and S31 and the image side surfaces S12, S22 and S32 are spherical surfaces. The second lenses L12, L22, and L32 are meniscus lenses having negative refractive power, and are made of plastic material, and the object side surfaces S13, S23, and S33 and the image side surfaces S14, S24, and S34 are aspheric surfaces. The third lenses L13, L23, and L33 are biconvex lenses having positive refractive power, and are made of glass material, and have object side surfaces S15, S25, and S36 being convex surfaces, image side surfaces S16, S26, and S37 being convex surfaces, and all of the object side surfaces S15, S25, and S36 and the image side surfaces S16, S26, and S37 being spherical surfaces. The fourth lenses L14, L24, and L34 are meniscus lenses having positive refractive power, and the object-side surfaces S18, S28, and S38 are concave surfaces, so as to reduce the phenomenon that light rays blocked by an infrared filter (IR cut filter) are reflected to the object-side surface of the fourth lens, and then reflected ghost images are focused, and the image-side surfaces S19, S29, and S39 are convex surfaces. The fifth lenses L15, L25, and L35 are meniscus lenses made of plastic material, and the object sides S110, S210, and S310 and the image sides S111, S211, and S311 are aspheric surfaces. The sixth lenses L16, L26, and L36 have positive refractive power and contribute to the dispersion of lens sensitivity, and the image side surfaces S113, S213, and S313 thereof are convex surfaces. The seventh lenses L17, L27, and L37 are meniscus lenses having positive refractive power, made of glass material, and have convex object-side surfaces S114, S214, and S314 and concave image-side surfaces S115, S215, and S315, which can focus the ghost image reflected by the light blocked by the infrared filter to the concave image-side surface of the seventh lens into the light source, so that the ghost image is overlapped with the light source and is not easily found, and the object-side surfaces S114, S214, and S314 and the image-side surfaces S115, S215, and S315 are spherical surfaces. When the object side surface of the fourth lens element is concave, the sixth lens element has positive refractive power, and the image side surface of the seventh lens element is concave, the occurrence of ghost images can be effectively reduced.
In addition, the wide- angle lenses 1, 2, 3 satisfy at least one of the following conditions:
65mm2x degree is less than or equal to ((f is multiplied by the FOV multiplied by the pi)/360) x TTL is less than or equal to 70mm2Degree of x; (1)
L1D/R12≤1.8； (2)
0.4≤L2T1/L2T2≤0.8； (3)
1.54≤Nd2≤1.68； (4)
1.54≤Nd5≤1.68； (5)
9mm≤Nd3×f3≤18mm； (6)
25mm≤Nd4×f4≤55mm； (7)
20mm≤NdLG×fLG≤40mm； (8)
13mm≤fAS2≤40mm； (9)
3.5mm≤fAS≤5.5mm； (10)
Wherein f is an effective focal length of the wide-angle lenses 1, 2, 3, f3 is an effective focal length of the third lenses L13, L23, L33, f4 is an effective focal length of the fourth lenses L14, L24, L34, fLG is an effective focal length of the lens closest to the image side in the first to third embodiments, FOV is a field of view of the wide-angle lenses 1, 2, 3 in the first to third embodiments, TTL is a distance between the object side surfaces S11, S21, S31 of the first lenses L11, L21, L31 and the imaging surfaces IMA1, IMA2, IMA3 on the optical axes OA1, OA2, OA3, L1D is an effective diameter of the image side surfaces S12, S22, S32, R32 of the first lenses L11, L21, L31 in the first to third embodiments, L4 is an effective focal length of the image side surfaces S12, S22, S32 of the first lenses L11, L21, L31, L3 in the first to third embodiments12In the first to third embodiments, the radius of curvature of the image-side surfaces S12, S22, S32 of the first lenses L11, L21, L31, L2T1 is the thickness of the second lenses L12, L22, L32 on the optical axes OA1, OA2, OA3, L2T2 is the edge thickness of the second lenses L12, L22, L32, nd2 is the refractive index of the second lenses L12, L22, L32, nd3 is the refractive index of the third lenses L13, L23, L33 in the first to third embodiments, nd4 is the refractive index of the fourth lenses L14, L24, L34, nd5 is the refractive index of the fifth lenses L15, L25, L35, ndLG is the refractive index of the lenses L17, L27, L37 closest to the image side, fAS is the effective focal length of the second lens from the stop ST1, ST2, ST3 to the image side in the first to third embodiments, fAS is the effective focal length of the second lens from the stop ST1, ST2, ST3 to the image side in the first to third embodiments, and the stop ST1, ST2, ST3 to the image side in the first to third embodimentsThe combined effective focal length of all the lenses in between. Therefore, the wide- angle lenses 1, 2 and 3 can effectively improve the field of view, effectively reduce the aperture value, effectively improve the resolution and effectively correct the aberration.
When condition (1) is satisfied: 65mm2X degree is less than or equal to ((f is multiplied by the FOV multiplied by the pi)/360) x TTL is less than or equal to 70mm2The distortion can be effectively corrected at x degrees. When condition (2) is satisfied: L1D/R12When the thickness is less than or equal to 1.8, the processing cost of the lens can be effectively reduced. When condition (3) is satisfied: when the ratio L2T1/L2T2 is more than or equal to 0.4 and less than or equal to 0.8, the processing cost of the lens can be effectively reduced. When condition (4) is satisfied: when Nd2 is more than or equal to 1.54 and less than or equal to 1.68, the spherical aberration can be effectively corrected. When condition (5) is satisfied: when Nd5 is more than or equal to 1.54 and less than or equal to 1.68, the spherical aberration can be effectively corrected. When condition (6) is satisfied: when Nd3 xf 3 is more than or equal to 9mm and less than or equal to 18mm, the influence of temperature on the back focal length offset can be effectively reduced. When condition (7) is satisfied: when Nd4 xf 4 is more than or equal to 25mm and less than or equal to 5.5mm, the field curvature can be effectively corrected. When condition (8) is satisfied: when NdLG multiplied by fLG is less than or equal to 20mm and less than or equal to 40mm, the field curvature can be effectively corrected. When condition (9) is satisfied: when the diameter is less than or equal to 13mm and less than or equal to fAS2 and less than or equal to 40mm, the distortion can be effectively corrected. When condition (10) is satisfied: when the distance between the two lenses is less than or equal to 3.5mm and less than or equal to fAS and less than or equal to 5.5mm, the sensitivity of the lens combination on the two sides of the aperture can be effectively balanced.
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 first lens element L11, a second lens element L12, a third lens element L13, an aperture stop ST1, a fourth lens element L14, a fifth lens element L15, a sixth lens element L16, a seventh lens element L17, a filter OF1, and a protective glass CG1. In imaging, light from the object side is finally imaged on the imaging surface IMA 1. According to [ embodiments ] the first to fourth paragraphs, wherein: the object-side surface S13 of the second lens element L12 is a concave surface, and the image-side surface S14 is a convex surface; the object-side surface S18 and the image-side surface S19 of the fourth lens element L14 are spherical surfaces; the fifth lens element L15 has positive refractive power, and has a convex object-side surface S110 and a concave image-side surface S111; the sixth lens element L16 is a biconvex lens element, wherein the object-side surface S112 is a convex surface, and both the object-side surface S112 and the image-side surface S113 are spherical surfaces; the object-side surface S116 and the image-side surface S117 OF the filter OF1 are both planar; the object-side surface S118 and the image-side surface S119 of the cover glass CG1 are both flat; by using the design that the lens, the aperture ST1 and at least one of the conditions (1) to (10) are satisfied, the wide-angle lens 1 can effectively improve the field of view, effectively reduce the aperture value, effectively improve the resolution and effectively correct the aberration.
Table one is a table of relevant parameters of each lens of the wide-angle lens 1 in fig. 1.
The second table is a table of the relevant parameters of the aspheric surface of the aspheric lens in the first table.
Table three shows the relevant parameter values of the wide-angle lens 1 of the first embodiment and the calculated values corresponding to the conditions (1) to (10), 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 (10).
Watch III
In addition, the optical performance of the wide-angle lens 1 of the first embodiment can also meet the requirement, and as can be seen from fig. 2A, the longitudinal aberration of the wide-angle lens 1 of the first embodiment is between-0.015 mm and 0.015 mm. As can be seen from fig. 2B, the field curvature of the wide-angle lens 1 of the first embodiment is between-0.04 mm and 0.03 mm. As can be seen from fig. 2C, the wide-angle lens 1 of the first embodiment has a distortion of-10% to 0%. As can be seen from fig. 2D, the lateral chromatic aberration of the wide-angle lens 1 of the first embodiment is between-2.1 μm and 2.1 μm. It is apparent that the longitudinal aberration, curvature of field, distortion, and lateral chromatic aberration of the wide-angle lens 1 of the first embodiment can be effectively corrected, thereby obtaining a better optical performance.
Referring to fig. 3, fig. 3 is a schematic lens configuration diagram of a wide-angle lens according to a second embodiment of the invention. The wide-angle lens 2 includes, in order from an object side to an image side along an optical axis OA2, a first lens L21, a second lens L22, a third lens L23, an aperture stop ST2, a fourth lens L24, a fifth lens L25, a sixth lens L26, a seventh lens L27, a filter OF2, and a cover glass CG2. In imaging, light from the object side is finally imaged on an imaging surface IMA 2. According to [ embodiments ] the first to fourth paragraphs, wherein: the object-side surface S23 of the second lens element L22 is a concave surface, and the image-side surface S24 is a convex surface; the object-side surface S28 and the image-side surface S29 of the fourth lens element L24 are spherical surfaces; the fifth lens element L25 has positive refractive power, and has a convex object-side surface S210 and a concave image-side surface S211; the sixth lens element L26 is a meniscus lens element, wherein the object-side surface S212 is concave, and both the object-side surface S212 and the image-side surface S213 are aspheric surfaces; the object-side surface S216 and the image-side surface S217 OF the filter OF2 are both flat; the object-side surface S218 and the image-side surface S219 of the cover glass CG2 are both planar; by using the design that the lens, the aperture ST2 and at least one of the conditions (1) to (10) are satisfied, the wide-angle lens 2 can effectively improve the field of view, effectively reduce the aperture value, effectively improve the resolution and effectively correct the aberration.
Table four is a table of the relevant parameters of each lens of the wide-angle lens 2 in fig. 3.
Watch four
Table five is a table of relevant parameters of the aspherical surface of the aspherical lens in table four.
Watch five
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 (10), 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 (10).
Watch six
In addition, the optical performance of the wide-angle lens 2 of the second embodiment can also meet the requirement, and as can be seen from fig. 4A, the longitudinal aberration of the wide-angle lens 2 of the second embodiment is between-0.01 mm and 0.01 mm. As can be seen from fig. 4B, the field curvature of the wide-angle lens 2 of the second embodiment is between-0.04 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-11% to 0%. As can be seen from fig. 4D, the lateral chromatic aberration of the wide-angle lens 2 of the second embodiment is between-1.8 μm and 1.8 μm. It is apparent that the longitudinal aberration, curvature of field, distortion, and lateral chromatic aberration 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 lens configuration diagram 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 first lens L31, a second lens L32, an aperture stop ST3, a third lens L33, a fourth lens L34, a fifth lens L35, a sixth lens L36, a seventh lens L37, a filter OF3, and a protective glass CG3. In imaging, light from the object side is finally imaged on an imaging surface IMA 3. According to [ embodiments ] the first to fourth paragraphs, wherein: the object-side surface S33 of the second lens element L32 is convex, and the image-side surface S34 is concave; the object-side surface S28 and the image-side surface S29 of the fourth lens element L34 are aspheric surfaces; the fifth lens element L35 has negative refractive power, and has a concave object-side surface S310 and a convex image-side surface S311; the sixth lens element L36 is a meniscus lens element, with the object-side surface S312 being a concave surface, and both the object-side surface S312 and the image-side surface S313 being aspheric surfaces; the object-side surface S316 and the image-side surface S317 OF the filter OF3 are both flat; the object-side surface S318 and the image-side surface S319 of the cover glass CG3 are both flat; by using the design that the lens, the aperture ST3 and at least one of the conditions (1) to (10) are satisfied, the wide-angle lens 3 can effectively improve the field of view, effectively reduce the aperture value, effectively improve the resolution and effectively correct the aberration.
Table seven is a table of the relevant parameters of each lens of the wide-angle lens 3 in fig. 5.
Watch seven
Table eight is a table of relevant parameters of the aspherical surfaces of the aspherical lenses in table seven.
Table eight
Table nine shows the related parameter values of the wide-angle lens 3 of the third embodiment and the calculated values corresponding to the conditions (1) to (10), 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 (10).
Watch nine
In addition, the optical performance of the wide-angle lens 3 of the third embodiment can also meet the requirement, and as can be seen from fig. 6A, the longitudinal aberration of the wide-angle lens 3 of the third embodiment is between-0.02 mm and 0.03 mm. As can be seen from fig. 6B, the wide-angle lens 3 of the third embodiment has a curvature of field between-0.03 mm and 0.05 mm. As can be seen from fig. 6C, the wide-angle lens 3 of the third embodiment has a distortion of-12% to 0%. As can be seen from fig. 6D, the lateral chromatic aberration of the wide-angle lens 3 of the third embodiment is between-1.6 μm and 1.6 μm. It is apparent that the longitudinal aberration, curvature of field, distortion, and lateral chromatic aberration of the wide-angle lens 3 of the third embodiment can be effectively corrected, thereby obtaining better optical performance.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (10)
1. A wide-angle lens, comprising:
the first lens has refractive power and comprises a concave surface facing to the image side;
the second lens has refractive power and is a meniscus lens;
the third lens has positive refractive power;
the fourth lens has positive refractive power;
the fifth lens has refractive power and is a meniscus lens;
the sixth lens has refractive power; and
the seventh lens element with positive refractive power comprises a concave surface facing the image side;
the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element are sequentially disposed along an optical axis from an object side to an image side.
2. A wide-angle lens, comprising:
the first lens has refractive power and comprises a concave surface facing to the image side;
the second lens has refractive power and is a meniscus lens;
the third lens has positive refractive power;
the fourth lens has positive refractive power and comprises a concave surface facing the object side;
the fifth lens has refractive power and is a meniscus lens;
the sixth lens has positive refractive power; and
the seventh 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, the sixth lens element and the seventh lens element are sequentially disposed along an optical axis from an object side to an image side.
3. The wide-angle lens of any one of claims 1 to 2, wherein the first lens has a negative refractive power, the second lens has a negative refractive power, and the sixth lens has a positive refractive power.
4. The wide-angle lens of claim 3, wherein:
the first lens further comprises a convex surface facing the object side; and
the second lens element includes a concave surface facing the object side and a convex surface facing the image side.
5. The wide-angle lens of claim 3, wherein:
the first lens further comprises a convex surface facing the object side; and
the second lens element includes a convex surface facing the object side and a concave surface facing the image side.
6. The wide-angle lens of claim 3, wherein the sixth lens element comprises a convex surface or a concave surface facing the object side.
7. The wide-angle lens of any one of claims 1 to 2, wherein:
the third lens element includes a convex surface facing the object side and another convex surface facing the image side;
the fourth lens element includes a convex surface facing the image side;
the sixth lens element includes a convex surface facing the image side; and
the seventh lens element includes a convex surface facing the object side.
8. The wide-angle lens of any one of claims 1 to 2, wherein the fifth lens element has positive refractive power and comprises a convex surface facing the object side and a concave surface facing the image side.
9. The wide-angle lens assembly as claimed in any one of claims 1 to 2, wherein the fifth lens element has negative refractive power and includes a concave surface facing the object side and a convex surface facing the image side.
10. The wide-angle lens of any one of claims 1 to 2, further comprising an aperture disposed between the second lens element and the fourth lens element, wherein the wide-angle lens at least satisfies one of the following conditions:
65mm2x degree is less than or equal to ((f is multiplied by the FOV multiplied by the pi)/360) x TTL is less than or equal to 70mm2Degree of x;
L1D/R12≤1.8；
0.4≤L2T1/L2T2≤0.8；
1.54≤Nd2≤1.68；
1.54≤Nd5≤1.68；
9mm≤Nd3×f3≤18mm；
25mm≤Nd4×f4≤55mm；
20mm≤NdLG×fLG≤40mm；
13mm≤fAS2≤40mm；
3.5mm≤fAS≤5.5mm；
wherein f is an effective focal length of the wide-angle lens, f3 is an effective focal length of the third lens element, f4 is an effective focal length of the fourth lens element, fLG is an effective focal length of a lens element closest to the image side, FOV is a field of view of the wide-angle lens, TTL is an axial distance between an object side surface and an image side surface of the first lens element, L1D is an optical effective diameter of an image side surface of the first lens element, R1D is an optical effective diameter of the image side surface of the first lens element, and12a radius of curvature of the image-side surface of the first lens element, L2T1 a thickness of the second lens element on the optical axis, L2T 2a thickness of an edge of the second lens element, and Nd2 the second lens elementThe refractive index of the mirror, the refractive index of the Nd3 third lens, the refractive index of the Nd4 fourth lens, the refractive index of the Nd5 fifth lens, the refractive index of the lens closest to the image side NdLG, fAS, the effective focal length of the second lens from the aperture stop to the image side, fAS, the combined effective focal length of all the lenses from the aperture stop to the image side.
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| CN202110472094.2A CN115268014B (en) | 2021-04-29 | 2021-04-29 | Wide-angle lens |
| US17/665,659 US20220276469A1 (en) | 2021-02-26 | 2022-02-07 | Lens Assembly |
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