US20180180844A1 - Lens assembly - Google Patents
Lens assembly Download PDFInfo
- Publication number
- US20180180844A1 US20180180844A1 US15/600,871 US201715600871A US2018180844A1 US 20180180844 A1 US20180180844 A1 US 20180180844A1 US 201715600871 A US201715600871 A US 201715600871A US 2018180844 A1 US2018180844 A1 US 2018180844A1
- Authority
- US
- United States
- Prior art keywords
- lens
- assembly
- refractive power
- focal length
- effective focal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/64—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having more than six components
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/002—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials
- G02B1/007—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials made of negative effective refractive index materials
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
Definitions
- the invention relates to a lens assembly.
- the total lens length and diameter are large for a lens assembly with field of view of more than 200 degrees. It is difficult to meet the requirements of miniaturization. Therefore, the lens assembly needs a new structure in order to meet the requirements of wide field of view, small F-number and miniaturization.
- the invention provides a lens assembly to solve the above problems.
- the lens assembly of the invention is provided with characteristics of a shortened total lens length, a wider field of view, a decreased F-number, and still has a good optical performance.
- the lens assembly in accordance with an exemplary embodiment of the invention includes a first lens, a second lens, a third lens, a fourth lens, a stop, a fifth lens, a sixth lens, a seventh lens and an eighth lens, all of which are arranged in order from an object side to an image side along an optical axis.
- the first lens is a meniscus lens with refractive power.
- the second lens is a meniscus lens with refractive power.
- the third lens is a biconcave lens with negative refractive power.
- the fourth lens is a biconvex lens with positive refractive power.
- the fifth lens is a biconvex lens with positive refractive power.
- the sixth lens is with positive refractive power.
- the seventh lens is with negative refractive power.
- the eighth lens is with positive refractive power.
- the sixth lens and the seventh lens are cemented together.
- the first lens is with negative refractive power
- the second lens is with negative refractive power
- the lens assembly satisfies: ⁇ 15 ⁇ f 1 /f ⁇ 1.8, wherein f 1 is an effective focal length of the first lens and f is an effective focal length of the lens assembly.
- the lens assembly satisfies: ⁇ 15 ⁇ f 2 /f ⁇ 1.8, wherein f 2 is an effective focal length of the second lens and f is an effective focal length of the lens assembly.
- the lens assembly satisfies: ⁇ 15 ⁇ f 3 /f ⁇ 1.8, wherein f 3 is an effective focal length of the third lens and f is an effective focal length of the lens assembly.
- the lens assembly satisfies: ⁇ 0.8 ⁇ f 123 /f ⁇ 0.6, wherein f 123 is an effective focal length of a combination of the first lens, the second lens and the third lens, and f is an effective focal length of the lens assembly.
- the lens assembly satisfies: 2.4 ⁇ f 8 /f ⁇ 2.8, wherein f 8 is an effective focal length of the eighth lens and f is an effective focal length of the lens assembly.
- the lens assembly satisfies: ⁇ 0.8 ⁇ f 1234 /f 5678 ⁇ 0.6, wherein f 1234 is an effective focal length of a combination of the first lens, the second lens, the third lens and the fourth lens, and f 5678 is an effective focal length of a combination of the fifth lens, the sixth lens, the seventh lens and the eighth lens.
- the lens assembly satisfies: 0.8 ⁇ TTL/D 1 ⁇ 1.6, wherein TTL is an interval from an object surface of the first lens to an image plane along the optical axis and D 1 is an effective diameter of the first lens.
- the lens assembly satisfies: 200° ⁇ FOV ⁇ 240°, wherein FOV is a maximum field of view in degree for the lens assembly.
- the first lens further comprises a convex surface facing the object side and a concave surface facing the image side.
- the second lens further comprises a convex surface facing the object side and a concave surface facing the image side.
- the third lens is a spherical lens.
- the second lens further includes two surfaces, at least one of which is an aspheric surface
- the third lens further includes two surfaces, at least one of which is an aspheric surface
- the fifth lens further includes two surfaces, at least one of which is an aspheric surface
- the eighth lens further includes two surfaces, at least one of which is an aspheric surface.
- the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are made of glass material.
- the lens assembly in accordance with an exemplary embodiment of the invention includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, all of which are arranged in order from an object side to an image side along an optical axis.
- the first lens is with negative refractive power.
- the second lens is with negative refractive power.
- the third lens is a biconcave lens with negative refractive power.
- the fourth lens is a biconvex lens with positive refractive power.
- the fifth lens is a biconvex lens with positive refractive power.
- the sixth lens is with positive refractive power.
- the seventh lens is with negative refractive power.
- the eighth lens is with positive refractive power.
- the lens assembly satisfies: ⁇ 15 ⁇ f 1 /f ⁇ f 2 /f ⁇ f 3 /f ⁇ 1.8, wherein f 1 is an effective focal length of the first lens, f 2 is an effective focal length of the second lens, f 3 is an effective focal length of the third lens and f is an effective focal length of the lens assembly.
- the lens assembly further comprises a stop disposed between the fourth lens and the fifth lens.
- FIG. 1 is a lens layout diagram of a lens assembly in accordance with a first embodiment of the invention
- FIG. 2A depicts a longitudinal aberration diagram of the lens assembly in accordance with the first embodiment of the invention
- FIG. 2B is a field curvature diagram of the lens assembly in accordance with the first embodiment of the invention.
- FIG. 2C is a distortion diagram of the lens assembly in accordance with the first embodiment of the invention.
- FIG. 3 is a lens layout diagram of a lens assembly in accordance with a second embodiment of the invention.
- FIG. 4A depicts a longitudinal aberration diagram of the lens assembly in accordance with the second embodiment of the invention.
- FIG. 4B is a field curvature diagram of the lens assembly in accordance with the second embodiment of the invention.
- FIG. 4C is a distortion diagram of the lens assembly in accordance with the second embodiment of the invention.
- FIG. 1 is a lens layout diagram of a lens assembly in accordance with a first embodiment of the invention.
- the lens assembly 1 includes a first lens L 11 , a second lens L 12 , a third lens L 13 , a fourth lens L 14 , a stop ST 1 , a fifth lens L 15 , a sixth lens L 16 , a seventh lens L 17 , an eighth lens L 18 and an optical filter OF 1 , all of which are arranged in order from an object side to an image side along an optical axis OA 1 .
- an image of light rays from the object side is formed at an image plane IMA 1 .
- the first lens L 11 is a meniscus lens with negative refractive power and made of glass material, wherein the object side surface S 11 is a convex surface, the image side surface S 12 is a concave surface and both of the object side surface S 11 and image side surface S 12 are spherical surfaces.
- the second lens L 12 is a meniscus lens with negative refractive power and made of glass material, wherein the object side surface S 13 is a convex surface, the image side surface S 14 is a concave surface and both of the object side surface S 13 and image side surface S 14 are aspheric surfaces.
- the third lens L 13 is a biconcave lens with negative refractive power and made of glass material, wherein the object side surface S 15 is a concave surface, the image side surface S 16 is a concave surface and both of the object side surface S 15 and image side surface S 16 are aspheric surfaces.
- the fourth lens L 14 is a biconvex lens with positive refractive power and made of glass material, wherein the object side surface S 17 is a convex surface, the image side surface S 18 is a convex surface and both of the object side surface S 17 and image side surface S 18 are spherical surfaces.
- the fifth lens L 15 is a biconvex lens with positive refractive power and made of glass material, wherein the object side surface S 110 is a convex surface, the image side surface S 111 is a convex surface and both of the object side surface S 110 and image side surface S 111 are aspheric surfaces.
- the sixth lens L 16 is a biconvex lens with positive refractive power and made of glass material, wherein the object side surface S 112 is a convex surface, the image side surface S 113 is a convex surface and both of the object side surface S 112 and image side surface S 113 are spherical surfaces.
- the seventh lens L 17 is a biconcave lens with negative refractive power and made of glass material, wherein the object side surface S 113 is a concave surface, the image side surface S 114 is a concave surface and both of the object side surface S 113 and image side surface S 114 are spherical surfaces.
- the sixth lens L 16 and the seventh lens L 17 are cemented together. That is, the air gap is not provided between the sixth lens L 16 and the seventh lens L 17 .
- the eighth lens L 18 is a biconvex lens with positive refractive power and made of glass material, wherein the object side surface S 115 is a convex surface, the image side surface S 116 is a convex surface and both of the object side surface S 115 and image side surface S 116 are aspheric surfaces.
- Both of the object side surface S 117 and image side surface S 118 of the optical filter OF 1 are plane surfaces.
- the lens assembly 1 satisfies at least one of the following conditions:
- f1 1 is an effective focal length of the first lens L 11
- f1 2 is an effective focal length of the second lens L 12
- f1 3 is an effective focal length of the third lens L 13
- f1 is an effective focal length of the lens assembly 1
- f1 123 is an effective focal length of a combination of the first lens L 11 , the second lens L 12 and the third lens L 13
- f1 8 is an effective focal length of the eighth lens L 18
- f1 1234 is an effective focal length of a combination of the first lens L 11 , the second lens L 12 , the third lens L 13 and the fourth lens L 14
- f1 5678 is an effective focal length of a combination of the fifth lens L 15 , the sixth lens L 16 , the seventh lens L 17 and the eighth lens L 18
- TTL1 is an interval from the object surface S 11 of the first lens L 11 to the image plane IMA 1 along the optical axis OA′
- D1 1 is an effective diameter of the first lens L 11 and FOV
- condition (1) can also be expressed as ⁇ 15 ⁇ f1 1 /f1 ⁇ 1.8, ⁇ 15 ⁇ f1 2 /f1 ⁇ 1.8, ⁇ 15 ⁇ f1 3 /f1 ⁇ 1.8.
- the lens assembly 1 is provided with an increased field of view, a decreased F-number, a shortened total lens length and an effective corrected aberration.
- the lens assembly 1 in accordance with the first embodiment of the invention is provided with the optical specifications shown in Table 1, which include the effective focal length, F-number, total lens length, radius of curvature of each lens surface, thickness between adjacent surface, refractive index of each lens and Abbe number of each lens.
- Table 1 shows that the effective focal length is equal to 1.26 mm, F-number is equal to 2.4, total lens length is equal to 19.5 mm and maximum field of view is equal to 235 degrees for the lens assembly 1 of the first embodiment of the invention.
- the aspheric surface sag z of each lens in table 1 can be calculated by the following formula:
- c curvature
- h the vertical distance from the lens surface to the optical axis
- k is conic constant
- A, B, C, D, E, F and G are aspheric coefficients.
- the conic constant k and the aspheric coefficients A, B, C, D, E, F, G of each surface are shown in Table 2.
- the effective focal length f1 is equal to 1.26 mm
- the effective focal length f1 1 of the first lens L 11 is equal to ⁇ 14.38 mm
- the effective focal length f1 2 of the second lens L 12 is equal to ⁇ 4.27 mm
- the effective focal length f1 3 of the third lens L 13 is equal to ⁇ 2.79 mm
- the effective focal length f1 8 of the eighth lens L 18 is equal to 3.19 mm
- the effective focal length f1 123 of the combination of the first lens L 11 , the second lens L 12 and the third lens L 13 is equal to ⁇ 0.98 mm
- the effective focal length f1 1234 of the combination of the first lens L 11 , the second lens L 12 , the third lens L 13 and the fourth lens L 14 is equal to ⁇ 2.74 mm
- the effective focal length f1 5678 of the combination of the fifth lens L 15 , the sixth lens L 16 , the seventh lens L 17 and the eighth lens L 18 is equal to 3.47 mm
- FIGS. 2A-2C show a longitudinal aberration diagram of the lens assembly 1 in accordance with the first embodiment of the invention
- FIG. 2B shows a field curvature diagram of the lens assembly 1 in accordance with the first embodiment of the invention
- FIG. 2C shows a distortion diagram of the lens assembly 1 in accordance with the first embodiment of the invention.
- the longitudinal aberration in the lens assembly 1 of the first embodiment ranges from ⁇ 0.0012 mm to 0.016 mm for the wavelength of 0.436 ⁇ m, 0.486 ⁇ m, 0.546 ⁇ m, 0.588 ⁇ m and 0.656 ⁇ m.
- the field curvature of tangential direction and sagittal direction in the lens assembly 1 of the first embodiment ranges from ⁇ 0.005 mm to 0.05 mm for the wavelength of 0.436 ⁇ m, 0.486 ⁇ m, 0.546 ⁇ m, 0.588 ⁇ m and 0.656 ⁇ m.
- the distortion in the lens assembly 1 of the first embodiment ranges from ⁇ 16% to 0% for the wavelength of 0.436 ⁇ m, 0.486 ⁇ m, 0.546 ⁇ m, 0.588 ⁇ m and 0.656 ⁇ m.
- the lens assembly 1 of the first embodiment is capable of good optical performance.
- FIG. 3 is a lens layout diagram of a lens assembly in accordance with a second embodiment of the invention.
- the lens assembly 2 includes a first lens L 21 , a second lens L 22 , a third lens L 23 , a fourth lens L 24 , a stop ST 2 , a fifth lens L 25 , a sixth lens L 26 , a seventh lens L 27 , an eighth lens L 28 and an optical filter OF 2 , all of which are arranged in order from an object side to an image side along an optical axis OA 2 .
- an image of light rays from the object side is formed at an image plane IMA 2 .
- the first lens L 21 is a meniscus lens with negative refractive power and made of glass material, wherein the object side surface S 21 is a convex surface, the image side surface S 22 is a concave surface and both of the object side surface S 21 and image side surface S 22 are spherical surfaces.
- the second lens L 22 is a meniscus lens with negative refractive power and made of glass material, wherein the object side surface S 23 is a convex surface, the image side surface S 24 is a concave surface and both of the object side surface S 23 and image side surface S 24 are aspheric surfaces.
- the third lens L 23 is a biconcave lens with negative refractive power and made of glass material, wherein the object side surface S 25 is a concave surface, the image side surface S 26 is a concave surface and both of the object side surface S 25 and image side surface S 26 are aspheric surfaces.
- the fourth lens L 24 is a biconvex lens with positive refractive power and made of glass material, wherein the object side surface S 27 is a convex surface, the image side surface S 28 is a convex surface and both of the object side surface S 27 and image side surface S 28 are spherical surfaces.
- the fifth lens L 25 is a biconvex lens with positive refractive power and made of glass material, wherein the object side surface S 210 is a convex surface, the image side surface S 211 is a convex surface and both of the object side surface S 210 and image side surface S 211 are aspheric surfaces.
- the sixth lens L 26 is a biconvex lens with positive refractive power and made of glass material, wherein the object side surface S 212 is a convex surface, the image side surface S 213 is a convex surface and both of the object side surface S 212 and image side surface S 213 are spherical surfaces.
- the seventh lens L 27 is a biconcave lens with negative refractive power and made of glass material, wherein the object side surface S 213 is a concave surface, the image side surface S 214 is a concave surface and both of the object side surface S 213 and image side surface S 214 are spherical surfaces.
- the sixth lens L 26 and the seventh lens L 27 are cemented together. That is, the air gap is not provided between the sixth lens L 26 and the seventh lens L 27 .
- the eighth lens L 28 is a biconvex lens with positive refractive power and made of glass material, wherein the object side surface S 215 is a convex surface, the image side surface S 216 is a convex surface and both of the object side surface S 215 and image side surface S 216 are aspheric surfaces.
- Both of the object side surface S 217 and image side surface S 218 of the optical filter OF 2 are plane surfaces.
- the lens assembly 2 satisfies at least one of the following conditions:
- f2, f2 1 , f2 2 , f2 3 , f2 8 , f2 123 , f2 1234 , f 2 5678 , TTL2, D2 1 and FOV2 are the same as that of f1, f1 1 , f1 2 , f1 3 , f1 8 , f1 123 , f1 1234 , f1 5678 , TTL1, D1 1 and FOV1 in the first embodiment, and is not described here again.
- condition (7) can also be expressed as ⁇ 15 ⁇ f2 1 /f2 ⁇ 1.8, ⁇ 15 ⁇ f2 2 /f2 ⁇ 1.8, ⁇ 15 ⁇ f2 3 /f2 ⁇ 1.8.
- the lens assembly 2 is provided with an increased field of view, a decreased F-number, a shortened total lens length and an effective corrected aberration.
- the lens assembly 2 in accordance with the second embodiment of the invention is provided with the optical specifications shown in Table 3, which include the effective focal length, F-number, total lens length, radius of curvature of each lens surface, thickness between adjacent surface, refractive index of each lens and Abbe number of each lens.
- Table 3 shows that the effective focal length is equal to 1.63 mm, F-number is equal to 2.4, total lens length is equal to 19.0 mm and maximum field of view is equal to 207 degrees for the lens assembly 2 of the second embodiment of the invention.
- the aspheric surface sag z of each lens in table 3 can be calculated by the following formula:
- c curvature
- h the vertical distance from the lens surface to the optical axis
- k is conic constant
- A, B, C, D, E, F and G are aspheric coefficients.
- the conic constant k and the aspheric coefficients A, B, C, D, E, F, G of each surface are shown in Table 4.
- the effective focal length f2 is equal to 1.63 mm
- the effective focal length f2 1 of the first lens L 21 is equal to ⁇ 7.91 mm
- the effective focal length f2 2 of the second lens L 22 is equal to ⁇ 7.04 mm
- the effective focal length f2 3 of the third lens L 23 is equal to ⁇ 3.17 mm
- the effective focal length f2 8 of the eighth lens L 28 is equal to 4.27 mm
- the effective focal length f2 123 of the combination of the first lens L 21 , the second lens L 22 and the third lens L 23 is equal to ⁇ 1.11 mm
- the effective focal length f2 1234 of the combination of the first lens L 21 , the second lens L 22 , the third lens L 23 and the fourth lens L 24 is equal to ⁇ 2.56 mm
- the effective focal length f2 5678 of the combination of the fifth lens L 25 , the sixth lens L 26 , the seventh lens L 27 and the eighth lens L 28 is equal to 3.99 mm
- FIGS. 4A-4C show a longitudinal aberration diagram of the lens assembly 2 in accordance with the second embodiment of the invention
- FIG. 4B shows a field curvature diagram of the lens assembly 2 in accordance with the second embodiment of the invention
- FIG. 4C shows a distortion diagram of the lens assembly 2 in accordance with the second embodiment of the invention.
- the longitudinal aberration in the lens assembly 2 of the second embodiment ranges from ⁇ 0.016 mm to 0.013 mm for the wavelength of 0.436 ⁇ m, 0.486 ⁇ m, 0.546 ⁇ m, 0.587 ⁇ m and 0.656 ⁇ m.
- the field curvature of tangential direction and sagittal direction in the lens assembly 2 of the second embodiment ranges from ⁇ 0.03 mm to 0.025 mm for the wavelength of 0.436 ⁇ m, 0.486 ⁇ m, 0.546 ⁇ m, 0.587 ⁇ m and 0.656 ⁇ m.
- the distortion in the lens assembly 2 of the second embodiment ranges from ⁇ 11% to 0% for the wavelength of 0.436 ⁇ m, 0.486 ⁇ m, 0.546 ⁇ m, 0.587 ⁇ m and 0.656 ⁇ m.
- the lens assembly 2 of the second embodiment is capable of good optical performance.
Abstract
Description
- This Application claims priority of China Patent Application No. 201611205833.7 filed on Dec. 23, 2016, the entirety of which is incorporated by reference herein.
- The invention relates to a lens assembly.
- Nowadays, the total lens length and diameter are large for a lens assembly with field of view of more than 200 degrees. It is difficult to meet the requirements of miniaturization. Therefore, the lens assembly needs a new structure in order to meet the requirements of wide field of view, small F-number and miniaturization.
- The invention provides a lens assembly to solve the above problems. The lens assembly of the invention is provided with characteristics of a shortened total lens length, a wider field of view, a decreased F-number, and still has a good optical performance.
- The lens assembly in accordance with an exemplary embodiment of the invention includes a first lens, a second lens, a third lens, a fourth lens, a stop, a fifth lens, a sixth lens, a seventh lens and an eighth lens, all of which are arranged in order from an object side to an image side along an optical axis. The first lens is a meniscus lens with refractive power. The second lens is a meniscus lens with refractive power. The third lens is a biconcave lens with negative refractive power. The fourth lens is a biconvex lens with positive refractive power. The fifth lens is a biconvex lens with positive refractive power. The sixth lens is with positive refractive power. The seventh lens is with negative refractive power. The eighth lens is with positive refractive power. The sixth lens and the seventh lens are cemented together.
- The first lens is with negative refractive power, and the second lens is with negative refractive power.
- The lens assembly satisfies: −15<f1/f<−1.8, wherein f1 is an effective focal length of the first lens and f is an effective focal length of the lens assembly.
- The lens assembly satisfies: −15<f2/f<−1.8, wherein f2 is an effective focal length of the second lens and f is an effective focal length of the lens assembly.
- The lens assembly satisfies: −15<f3/f<−1.8, wherein f3 is an effective focal length of the third lens and f is an effective focal length of the lens assembly.
- The lens assembly satisfies: −0.8<f123/f<−0.6, wherein f123 is an effective focal length of a combination of the first lens, the second lens and the third lens, and f is an effective focal length of the lens assembly.
- The lens assembly satisfies: 2.4<f8/f<2.8, wherein f8 is an effective focal length of the eighth lens and f is an effective focal length of the lens assembly.
- The lens assembly satisfies: −0.8<f1234/f5678<−0.6, wherein f1234 is an effective focal length of a combination of the first lens, the second lens, the third lens and the fourth lens, and f5678 is an effective focal length of a combination of the fifth lens, the sixth lens, the seventh lens and the eighth lens.
- The lens assembly satisfies: 0.8<TTL/D1<1.6, wherein TTL is an interval from an object surface of the first lens to an image plane along the optical axis and D1 is an effective diameter of the first lens.
- The lens assembly satisfies: 200°<FOV<240°, wherein FOV is a maximum field of view in degree for the lens assembly.
- The first lens further comprises a convex surface facing the object side and a concave surface facing the image side.
- The second lens further comprises a convex surface facing the object side and a concave surface facing the image side.
- The third lens is a spherical lens.
- The second lens further includes two surfaces, at least one of which is an aspheric surface, the third lens further includes two surfaces, at least one of which is an aspheric surface, the fifth lens further includes two surfaces, at least one of which is an aspheric surface, and the eighth lens further includes two surfaces, at least one of which is an aspheric surface.
- The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are made of glass material.
- The lens assembly in accordance with an exemplary embodiment of the invention includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, all of which are arranged in order from an object side to an image side along an optical axis. The first lens is with negative refractive power. The second lens is with negative refractive power. The third lens is a biconcave lens with negative refractive power. The fourth lens is a biconvex lens with positive refractive power. The fifth lens is a biconvex lens with positive refractive power. The sixth lens is with positive refractive power. The seventh lens is with negative refractive power. The eighth lens is with positive refractive power. The lens assembly satisfies: −15<f1/f<f2/f<f3/f<−1.8, wherein f1 is an effective focal length of the first lens, f2 is an effective focal length of the second lens, f3 is an effective focal length of the third lens and f is an effective focal length of the lens assembly.
- The lens assembly further comprises a stop disposed between the fourth lens and the fifth lens.
- A detailed description is given in the following embodiments with reference to the accompanying drawings.
- The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:
-
FIG. 1 is a lens layout diagram of a lens assembly in accordance with a first embodiment of the invention; -
FIG. 2A depicts a longitudinal aberration diagram of the lens assembly in accordance with the first embodiment of the invention; -
FIG. 2B is a field curvature diagram of the lens assembly in accordance with the first embodiment of the invention; -
FIG. 2C is a distortion diagram of the lens assembly in accordance with the first embodiment of the invention; -
FIG. 3 is a lens layout diagram of a lens assembly in accordance with a second embodiment of the invention; -
FIG. 4A depicts a longitudinal aberration diagram of the lens assembly in accordance with the second embodiment of the invention; -
FIG. 4B is a field curvature diagram of the lens assembly in accordance with the second embodiment of the invention; and -
FIG. 4C is a distortion diagram of the lens assembly in accordance with the second embodiment of the invention. - The following description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims.
- Referring to
FIG. 1 ,FIG. 1 is a lens layout diagram of a lens assembly in accordance with a first embodiment of the invention. Thelens assembly 1 includes a first lens L11, a second lens L12, a third lens L13, a fourth lens L14, a stop ST1, a fifth lens L15, a sixth lens L16, a seventh lens L17, an eighth lens L18 and an optical filter OF1, all of which are arranged in order from an object side to an image side along an optical axis OA1. In operation, an image of light rays from the object side is formed at an image plane IMA1. - The first lens L11 is a meniscus lens with negative refractive power and made of glass material, wherein the object side surface S11 is a convex surface, the image side surface S12 is a concave surface and both of the object side surface S11 and image side surface S12 are spherical surfaces.
- The second lens L12 is a meniscus lens with negative refractive power and made of glass material, wherein the object side surface S13 is a convex surface, the image side surface S14 is a concave surface and both of the object side surface S13 and image side surface S14 are aspheric surfaces.
- The third lens L13 is a biconcave lens with negative refractive power and made of glass material, wherein the object side surface S15 is a concave surface, the image side surface S16 is a concave surface and both of the object side surface S15 and image side surface S16 are aspheric surfaces.
- The fourth lens L14 is a biconvex lens with positive refractive power and made of glass material, wherein the object side surface S17 is a convex surface, the image side surface S18 is a convex surface and both of the object side surface S17 and image side surface S18 are spherical surfaces.
- The fifth lens L15 is a biconvex lens with positive refractive power and made of glass material, wherein the object side surface S110 is a convex surface, the image side surface S111 is a convex surface and both of the object side surface S110 and image side surface S111 are aspheric surfaces.
- The sixth lens L16 is a biconvex lens with positive refractive power and made of glass material, wherein the object side surface S112 is a convex surface, the image side surface S113 is a convex surface and both of the object side surface S112 and image side surface S113 are spherical surfaces.
- The seventh lens L17 is a biconcave lens with negative refractive power and made of glass material, wherein the object side surface S113 is a concave surface, the image side surface S114 is a concave surface and both of the object side surface S113 and image side surface S114 are spherical surfaces.
- The sixth lens L16 and the seventh lens L17 are cemented together. That is, the air gap is not provided between the sixth lens L16 and the seventh lens L17.
- The eighth lens L18 is a biconvex lens with positive refractive power and made of glass material, wherein the object side surface S115 is a convex surface, the image side surface S116 is a convex surface and both of the object side surface S115 and image side surface S116 are aspheric surfaces.
- Both of the object side surface S117 and image side surface S118 of the optical filter OF1 are plane surfaces.
- In order to maintain excellent optical performance of the lens assembly in accordance with the first embodiment of the invention, the
lens assembly 1 satisfies at least one of the following conditions: -
−15<f1123 /f1<f12 /f1<f13 /f1<−1.8 (1) -
−0.8<f1123 /f1<−0.6 (2) -
2.4<f18 /f1<2.8 (3) -
−0.8<f11234 /f15678<−0.6 (4) -
0.8<TTL1/D11<1.6 (5) -
200°<FOV1<240° (6) - wherein f11 is an effective focal length of the first lens L11, f12 is an effective focal length of the second lens L12, f13 is an effective focal length of the third lens L13, f1 is an effective focal length of the
lens assembly 1, f1123 is an effective focal length of a combination of the first lens L11, the second lens L12 and the third lens L13, f18 is an effective focal length of the eighth lens L18, f11234 is an effective focal length of a combination of the first lens L11, the second lens L12, the third lens L13 and the fourth lens L14, f15678 is an effective focal length of a combination of the fifth lens L15, the sixth lens L16, the seventh lens L17 and the eighth lens L18, TTL1 is an interval from the object surface S11 of the first lens L11 to the image plane IMA1 along the optical axis OA′, D11 is an effective diameter of the first lens L11 and FOV1 is a maximum field of view in degree for thelens assembly 1. - Since f1 is a positive value, so that f13>f12>f11 can be deduced from condition (1). The condition (1) can also be expressed as −15<f11/f1<−1.8, −15<f12/f1<−1.8, −15<f13/f1<−1.8.
- By the above design of the lenses and stop ST1, the
lens assembly 1 is provided with an increased field of view, a decreased F-number, a shortened total lens length and an effective corrected aberration. - In order to achieve the above purposes and effectively enhance the optical performance, the
lens assembly 1 in accordance with the first embodiment of the invention is provided with the optical specifications shown in Table 1, which include the effective focal length, F-number, total lens length, radius of curvature of each lens surface, thickness between adjacent surface, refractive index of each lens and Abbe number of each lens. Table 1 shows that the effective focal length is equal to 1.26 mm, F-number is equal to 2.4, total lens length is equal to 19.5 mm and maximum field of view is equal to 235 degrees for thelens assembly 1 of the first embodiment of the invention. -
TABLE 1 Effective Focal Length = 1.26 mm F-number = 2.4 Total Lens Length = 19.5 mm Maximum Field of View = 235 Degrees Radius of Surface Curvature Thickness Number (mm) (mm) Nd Vd Remark S11 14.840 2.270 1.95 18.0 The First Lens L11 S12 6.610 3.400 S13 40.018 0.550 1.59 61.2 The Second Lens L12 S14 2.366 1.790 S15 −3.910 0.500 1.62 63.7 The Third Lens L13 S16 3.265 0.390 S17 5.100 3.150 1.85 23.8 The Fourth Lens L14 S18 −11.870 0.080 S19 ∞ 0.020 1.866 Stop ST1 S110 3.165 1.310 1.50 81.1 The Fifth Lens L15 S111 −4.954 0.100 S112 3.720 1.760 1.50 81.6 The Sixth Lens L16 S113 −2.050 0.500 1.85 23.8 The Seventh Lens L17 S114 4.620 0.280 S115 3.667 1.430 1.80 40.9 The Eighth Lens L18 S116 −7.154 0.100 S117 ∞ 0.500 1.52 64.2 Optical Filter OF1 S118 ∞ 1.377 - The aspheric surface sag z of each lens in table 1 can be calculated by the following formula:
-
z=ch 2/{1+[1−(k+1)c 2 h 2]1/2 }+Ah 4 +Bh 6 +Ch 8 +Dh 10 +Eh 12 +Fh 14 +Gh 16 - where c is curvature, h is the vertical distance from the lens surface to the optical axis, k is conic constant and A, B, C, D, E, F and G are aspheric coefficients.
- In the first embodiment, the conic constant k and the aspheric coefficients A, B, C, D, E, F, G of each surface are shown in Table 2.
-
TABLE 2 Surface Number k A B C D E F G S13 −78.023 3.72E−04 7.56E−05 −8.14E−07 −2.17E−07 6.60E−09 1.53E−10 −5.31E−12 S14 −0.262 −3.53E−03 9.32E−04 −7.58E−05 −8.15E−05 2.18E−05 1.68E−06 −4.53E−07 S15 −0.700 1.11E−03 4.46E−04 5.64E−05 7.57E−07 −2.30E−06 −3.35E−07 0.00E+00 S16 0.864 1.38E−02 −4.55E−04 1.13E−03 −3.41E−04 3.12E−05 −3.49E−06 0.00E+00 S110 0.665 2.50E−03 −1.30E−03 3.22E−03 −1.79E−03 4.83E−04 −7.32E−05 0.00E+00 S111 −11.248 −3.32E−03 1.04E−03 1.33E−03 −3.34E−04 6.45E−04 −2.58E−04 0.00E+00 S115 0.246 −9.70E−03 1.87E−03 −1.83E−04 2.87E−05 −9.54E−06 1.26E−06 −5.63E−08 S116 −3.296 2.32E−03 8.48E−04 1.19E−04 3.19E−05 −1.27E−05 3.16E−07 5.62E−08 - For the
lens assembly 1 of the first embodiment, the effective focal length f1 is equal to 1.26 mm, the effective focal length f11 of the first lens L11 is equal to −14.38 mm, the effective focal length f12 of the second lens L12 is equal to −4.27 mm, the effective focal length f13 of the third lens L13 is equal to −2.79 mm, the effective focal length f18 of the eighth lens L18 is equal to 3.19 mm, the effective focal length f1123 of the combination of the first lens L11, the second lens L12 and the third lens L13 is equal to −0.98 mm, the effective focal length f11234 of the combination of the first lens L11, the second lens L12, the third lens L13 and the fourth lens L14 is equal to −2.74 mm, the effective focal length f15678 of the combination of the fifth lens L15, the sixth lens L16, the seventh lens L17 and the eighth lens L18 is equal to 3.47 mm, the interval TTL1 from the object side surface S11 of the first lens L11 to the image plane IMA1 along the optical axis OA′ is equal to 19.5 mm, the effective diameter D11 of the first lens L11 is equal to 22.6 mm and the maximum field of view FOV1 for thelens assembly 1 is equal to 235 degrees. According to the above data, the following values can be obtained: -
f11 /f1=−11.41, -
f12 /f1=−3 0.39, -
f13 /f1=−2.21, -
f1123 /f1=−0.78, -
f18 /f1=2.53, -
f11234 /f15678=−0.789, -
TTL1/D11=0.86, -
FOV1=235 Degrees - which respectively satisfy the above conditions (1)-(6).
- By the above arrangements of the lenses and stop ST1, the
lens assembly 1 of the first embodiment can meet the requirements of optical performance as seen inFIGS. 2A-2C , whereinFIG. 2A shows a longitudinal aberration diagram of thelens assembly 1 in accordance with the first embodiment of the invention,FIG. 2B shows a field curvature diagram of thelens assembly 1 in accordance with the first embodiment of the invention andFIG. 2C shows a distortion diagram of thelens assembly 1 in accordance with the first embodiment of the invention. - It can be seen from
FIG. 2A that the longitudinal aberration in thelens assembly 1 of the first embodiment ranges from −0.0012 mm to 0.016 mm for the wavelength of 0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm and 0.656 μm. - It can be seen from
FIG. 2B that the field curvature of tangential direction and sagittal direction in thelens assembly 1 of the first embodiment ranges from −0.005 mm to 0.05 mm for the wavelength of 0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm and 0.656 μm. - It can be seen from
FIG. 2C (in which the five lines in the figure almost coincide to appear as if a signal line) that the distortion in thelens assembly 1 of the first embodiment ranges from −16% to 0% for the wavelength of 0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm and 0.656 μm. - It is obvious that the longitudinal aberration, the field curvature and the distortion of the
lens assembly 1 of the first embodiment can be corrected effectively. Therefore, thelens assembly 1 of the first embodiment is capable of good optical performance. - Referring to
FIG. 3 ,FIG. 3 is a lens layout diagram of a lens assembly in accordance with a second embodiment of the invention. Thelens assembly 2 includes a first lens L21, a second lens L22, a third lens L23, a fourth lens L24, a stop ST2, a fifth lens L25, a sixth lens L26, a seventh lens L27, an eighth lens L28 and an optical filter OF2, all of which are arranged in order from an object side to an image side along an optical axis OA2. In operation, an image of light rays from the object side is formed at an image plane IMA2. - The first lens L21 is a meniscus lens with negative refractive power and made of glass material, wherein the object side surface S21 is a convex surface, the image side surface S22 is a concave surface and both of the object side surface S21 and image side surface S22 are spherical surfaces.
- The second lens L22 is a meniscus lens with negative refractive power and made of glass material, wherein the object side surface S23 is a convex surface, the image side surface S24 is a concave surface and both of the object side surface S23 and image side surface S24 are aspheric surfaces.
- The third lens L23 is a biconcave lens with negative refractive power and made of glass material, wherein the object side surface S25 is a concave surface, the image side surface S26 is a concave surface and both of the object side surface S25 and image side surface S26 are aspheric surfaces.
- The fourth lens L24 is a biconvex lens with positive refractive power and made of glass material, wherein the object side surface S27 is a convex surface, the image side surface S28 is a convex surface and both of the object side surface S27 and image side surface S28 are spherical surfaces.
- The fifth lens L25 is a biconvex lens with positive refractive power and made of glass material, wherein the object side surface S210 is a convex surface, the image side surface S211 is a convex surface and both of the object side surface S210 and image side surface S211 are aspheric surfaces.
- The sixth lens L26 is a biconvex lens with positive refractive power and made of glass material, wherein the object side surface S212 is a convex surface, the image side surface S213 is a convex surface and both of the object side surface S212 and image side surface S213 are spherical surfaces.
- The seventh lens L27 is a biconcave lens with negative refractive power and made of glass material, wherein the object side surface S213 is a concave surface, the image side surface S214 is a concave surface and both of the object side surface S213 and image side surface S214 are spherical surfaces.
- The sixth lens L26 and the seventh lens L27 are cemented together. That is, the air gap is not provided between the sixth lens L26 and the seventh lens L27.
- The eighth lens L28 is a biconvex lens with positive refractive power and made of glass material, wherein the object side surface S215 is a convex surface, the image side surface S216 is a convex surface and both of the object side surface S215 and image side surface S216 are aspheric surfaces.
- Both of the object side surface S217 and image side surface S218 of the optical filter OF2 are plane surfaces.
- In order to maintain excellent optical performance of the lens assembly in accordance with the second embodiment of the invention, the
lens assembly 2 satisfies at least one of the following conditions: -
−15<f21 /f2<f22 /f2<f23 /f2<−1.8 (7) -
−0.8<f2123 /f2<−0.6 (8) -
2.4<f28 /f2<2.8 (9) -
−0.8<f21234 /f25678<−0.6 (10) -
0.8<TTL2/D21<1.6 (11) -
200°<FOV2<240° (12) - The definition of f2, f21, f22, f23, f28, f2123, f21234, f2 5678, TTL2, D21 and FOV2 are the same as that of f1, f11, f12, f13, f18, f1123, f11234, f15678, TTL1, D11 and FOV1 in the first embodiment, and is not described here again.
- Since f2 is a positive value, so that f23>f22>f21 can be deduced from condition (7). The condition (7) can also be expressed as −15<f21/f2<−1.8, −15<f22/f2<−1.8, −15<f23/f2<−1.8.
- By the above design of the lenses and stop ST2, the
lens assembly 2 is provided with an increased field of view, a decreased F-number, a shortened total lens length and an effective corrected aberration. - In order to achieve the above purposes and effectively enhance the optical performance, the
lens assembly 2 in accordance with the second embodiment of the invention is provided with the optical specifications shown in Table 3, which include the effective focal length, F-number, total lens length, radius of curvature of each lens surface, thickness between adjacent surface, refractive index of each lens and Abbe number of each lens. Table 3 shows that the effective focal length is equal to 1.63 mm, F-number is equal to 2.4, total lens length is equal to 19.0 mm and maximum field of view is equal to 207 degrees for thelens assembly 2 of the second embodiment of the invention. -
TABLE 3 Effective Focal Length = 1.63 mm F-number = 2.4 Total Lens Length = 19.0 mm Maximum Field of View = 207 Degrees Radius of Surface Curvature Thickness Number (mm) (mm) Nd Vd Remark S21 11.240 0.690 1.95 18.0 The First Lens L21 S22 4.390 2.030 S23 8.269 0.500 1.59 61.2 The Second Lens L22 S24 2.708 1.880 S25 −4.830 0.500 1.62 63.7 The Third Lens L23 S26 3.440 0.370 S27 4.890 4.290 1.85 23.8 The Fourth Lens L24 S28 −28.190 0.260 S29 ∞ −0.180 2.743 Stop ST2 S210 2.782 1.500 1.50 81.1 The Fifth Lens L25 S211 −7.336 0.600 S212 3.950 2.030 1.49 70.4 The Sixth Lens L26 S213 −2.000 0.500 1.85 23.8 The Seventh Lens L27 S214 6.200 0.450 S215 4.515 1.480 1.81 40.9 The Eighth Lens L28 S216 −12.695 0.100 S217 ∞ 0.500 1.52 64.2 Optical Filter OF2 S218 ∞ 1.504 - The aspheric surface sag z of each lens in table 3 can be calculated by the following formula:
-
z=ch 2/{1+[1−(k+1)c 2 h 2]1/2 }+Ah 4 +Bh 6 +Ch 8 +Dh 10 +Eh 12 ±Fh 14 ±Gh 16 - where c is curvature, h is the vertical distance from the lens surface to the optical axis, k is conic constant and A, B, C, D, E, F and G are aspheric coefficients.
- In the second embodiment, the conic constant k and the aspheric coefficients A, B, C, D, E, F, G of each surface are shown in Table 4.
-
TABLE 4 Surface Number k A B C D E F G S23 0.763 −2.85E−03 6.60E−05 1.67E−05 −1.15E−06 5.80E−09 8.53E−10 0.00E+00 S24 −0.401 −1.74E−03 −1.58E−04 4.93E−04 −1.45E−04 7.95E−06 4.13E−06 −4.97E−07 S210 0.130 −3.31E−03 6.30E−04 −4.04E−04 2.03E−04 −3.68E−05 −1.89E−06 0.00E+00 S211 −18.852 −1.15E−03 2.14E−03 −8.72E−04 4.48E−04 −9.17E−05 5.75E−06 0.00E+00 S215 0.483 −4.39E−03 6.75E−04 −2.18E−04 5.59E−05 −9.16E−06 6.79E−07 −1.81E−08 S216 −8.085 3.59E−03 −2.25E−04 2.53E−05 2.09E−05 −5.92E−06 3.94E−07 −2.76E−09 - For the
lens assembly 2 of the second embodiment, the effective focal length f2 is equal to 1.63 mm, the effective focal length f21 of the first lens L21 is equal to −7.91 mm, the effective focal length f22 of the second lens L22 is equal to −7.04 mm, the effective focal length f23 of the third lens L23 is equal to −3.17 mm, the effective focal length f28 of the eighth lens L28 is equal to 4.27 mm, the effective focal length f2123 of the combination of the first lens L21, the second lens L22 and the third lens L23 is equal to −1.11 mm, the effective focal length f21234 of the combination of the first lens L21, the second lens L22, the third lens L23 and the fourth lens L24 is equal to −2.56 mm, the effective focal length f25678 of the combination of the fifth lens L25, the sixth lens L26, the seventh lens L27 and the eighth lens L28 is equal to 3.99 mm, the interval TTL2 from the object side surface S21 of the first lens L21 to the image plane IMA2 along the optical axis OA2 is equal to 19.0 mm, the effective diameter D21 of the first lens L21 is equal to 12.5 mm and the maximum field of view FOV2 for thelens assembly 2 is equal to 207 degrees. According to the above data, the following values can be obtained: -
f21 /f2=−4.84, -
f22 /f2=−4.31, -
f23 /f2=−1.94, -
f2123 /f2=−0.68, -
f28 /f2=2.62, -
f21234 /f25678=−0.64, -
TTL2/D21=1.52, -
FOV1=207 Degrees - which respectively satisfy the above conditions (7)-(12).
- By the above arrangements of the lenses and stop ST2, the
lens assembly 2 of the second embodiment can meet the requirements of optical performance as seen inFIGS. 4A-4C , whereinFIG. 4A shows a longitudinal aberration diagram of thelens assembly 2 in accordance with the second embodiment of the invention,FIG. 4B shows a field curvature diagram of thelens assembly 2 in accordance with the second embodiment of the invention andFIG. 4C shows a distortion diagram of thelens assembly 2 in accordance with the second embodiment of the invention. - It can be seen from
FIG. 4A that the longitudinal aberration in thelens assembly 2 of the second embodiment ranges from −0.016 mm to 0.013 mm for the wavelength of 0.436 μm, 0.486 μm, 0.546 μm, 0.587 μm and 0.656 μm. - It can be seen from
FIG. 4B that the field curvature of tangential direction and sagittal direction in thelens assembly 2 of the second embodiment ranges from −0.03 mm to 0.025 mm for the wavelength of 0.436 μm, 0.486 μm, 0.546 μm, 0.587 μm and 0.656 μm. - It can be seen from
FIG. 4C (in which the five lines in the figure almost coincide to appear as if a signal line) that the distortion in thelens assembly 2 of the second embodiment ranges from −11% to 0% for the wavelength of 0.436 μm, 0.486 μm, 0.546 μm, 0.587 μm and 0.656 μm. - It is obvious that the longitudinal aberration, the field curvature and the distortion of the
lens assembly 2 of the second embodiment can be corrected effectively. Therefore, thelens assembly 2 of the second embodiment is capable of good optical performance. - While the invention has been described by way of example and in terms of the preferred embodiment(s), it is to be understood that the invention is not limited thereto. On the contrary, it is intended to cover various modifications and similar arrangements and procedures, and the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements and procedures.
Claims (19)
−15<f 1 /f<−1.8,
−15<f 2 /f<−1.8,
−15<f 3 /f<−1.8,
−0.8<f 123 /f<−0.6,
2.4<f 8 /f<2.8,
0.8<f 1234 /f 5678<−0.6,
0.8<TTL/D 1<1.6,
200°<FOV<240°,
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/600,871 US9989732B1 (en) | 2017-05-22 | 2017-05-22 | Lens assembly |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201611205833.7 | 2016-12-23 | ||
US15/600,871 US9989732B1 (en) | 2017-05-22 | 2017-05-22 | Lens assembly |
Publications (2)
Publication Number | Publication Date |
---|---|
US9989732B1 US9989732B1 (en) | 2018-06-05 |
US20180180844A1 true US20180180844A1 (en) | 2018-06-28 |
Family
ID=62234974
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/600,871 Active US9989732B1 (en) | 2017-05-22 | 2017-05-22 | Lens assembly |
Country Status (1)
Country | Link |
---|---|
US (1) | US9989732B1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20190033558A1 (en) * | 2017-07-27 | 2019-01-31 | Ability Opto-Electronics Technology Co.Ltd. | Optical image capturing system |
US10302914B2 (en) * | 2017-05-15 | 2019-05-28 | Ability Opto-Electronics Technology Co. Ltd. | Optical image capturing system |
US10353183B2 (en) * | 2017-07-27 | 2019-07-16 | Ability Opto-Electronics Technology Co. Ltd. | Optical image capturing system |
US10502933B2 (en) * | 2017-01-06 | 2019-12-10 | Ability Opto-Electronics Technology Co., Ltd. | Optical image capturing system |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112946860B (en) * | 2019-12-11 | 2022-07-26 | 信泰光学(深圳)有限公司 | Wide-angle lens |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090303608A1 (en) * | 2006-02-14 | 2009-12-10 | Jos. Schneider Optische Werke Gmbh | Optical system for digital cinema projection |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI439722B (en) | 2012-07-27 | 2014-06-01 | Young Optics Inc | Fixed-focus lens |
-
2017
- 2017-05-22 US US15/600,871 patent/US9989732B1/en active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090303608A1 (en) * | 2006-02-14 | 2009-12-10 | Jos. Schneider Optische Werke Gmbh | Optical system for digital cinema projection |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10502933B2 (en) * | 2017-01-06 | 2019-12-10 | Ability Opto-Electronics Technology Co., Ltd. | Optical image capturing system |
US10302914B2 (en) * | 2017-05-15 | 2019-05-28 | Ability Opto-Electronics Technology Co. Ltd. | Optical image capturing system |
US20190033558A1 (en) * | 2017-07-27 | 2019-01-31 | Ability Opto-Electronics Technology Co.Ltd. | Optical image capturing system |
US10353183B2 (en) * | 2017-07-27 | 2019-07-16 | Ability Opto-Electronics Technology Co. Ltd. | Optical image capturing system |
US10444474B2 (en) * | 2017-07-27 | 2019-10-15 | Ability Opto-Electronics Technology Co. Ltd. | Optical image capturing system |
Also Published As
Publication number | Publication date |
---|---|
US9989732B1 (en) | 2018-06-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US9989732B1 (en) | Lens assembly | |
US9696520B2 (en) | Wide-angle lens | |
CN108241202B (en) | Imaging lens | |
US20170248775A1 (en) | Wide-Angle Lens | |
US9733450B2 (en) | Lens assembly | |
US9523840B2 (en) | Lens assembly | |
US9939612B2 (en) | Wide-angle lens | |
US9690082B2 (en) | Wide-angle projection lens | |
US11391922B2 (en) | Lens assembly including seven lenses of −−+++−+ refractive powers | |
US9256057B2 (en) | Projection lens | |
US11187874B2 (en) | Wide-angle lens assembly | |
US10156698B2 (en) | Wide-angle lens assembly | |
US9057870B2 (en) | Zoom lens | |
US10234654B2 (en) | Lens assembly | |
US11385437B2 (en) | Lens assembly | |
US10866388B2 (en) | Lens assembly | |
US10739570B2 (en) | Telephoto lens assembly | |
US10598908B2 (en) | Wide-angle lens assembly | |
US10948698B2 (en) | Lens assembly | |
US11947092B2 (en) | Lens assembly | |
US10261291B2 (en) | Lens assembly | |
CN216052400U (en) | Fingerprint identification optical lens | |
US11099363B2 (en) | Lens device | |
CN111766679B (en) | Imaging lens | |
US11604334B2 (en) | Lens assembly |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SINTAI OPTICAL (SHENZHEN) CO., LTD., CHINA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FU, TAO;REEL/FRAME:042448/0152 Effective date: 20170428 Owner name: ASIA OPTICAL CO., INC., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FU, TAO;REEL/FRAME:042448/0152 Effective date: 20170428 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1551); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Year of fee payment: 4 |