CN109358404B - Large-target-surface ultra-wide-angle high-definition lens - Google Patents
Large-target-surface ultra-wide-angle high-definition lens Download PDFInfo
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- CN109358404B CN109358404B CN201811238309.9A CN201811238309A CN109358404B CN 109358404 B CN109358404 B CN 109358404B CN 201811238309 A CN201811238309 A CN 201811238309A CN 109358404 B CN109358404 B CN 109358404B
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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
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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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
- G02B13/0055—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
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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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Abstract
The invention discloses a large-target-surface ultra-wide-angle high-definition lens, which consists of a lens barrel and a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are coaxially arranged in the lens barrel along the object space to the image space in sequence, wherein the first lens, the second lens, the third lens and the fifth lens are glass spherical lenses with negative focal power; this fourth lens, sixth lens and seventh lens are the glass sphere lens of positive focal power, and each lens adopts specific curvature radius, thickness and interval setting, makes the visual angle theta of this camera lens great, can reach 170 degrees, and the diaphragm can accomplish 2.0, and the resolution is high, and it satisfies the requirement of high definition quality and can possess bigger visual angle, is suitable for monitoring on a large scale, and the specially adapted resolution is on joining in marriage the high definition sensitization product of 800 ten thousand pixel chips, for example: police law enforcement, frontier defense monitoring lenses, etc.
Description
Technical Field
The invention relates to the technical field of electronic products, in particular to a large-target-surface ultra-wide-angle high-definition lens.
Background
In recent years, as the application range of the camera lens is more and more extensive, for example, a police law enforcement instrument, a frontier monitoring lens, etc., however, the existing law enforcement instrument and frontier monitoring lens generally have the following defects: the visual angle is not large enough, the aperture is small, the overall dimension is large, the size is large when the device is used, and the occupied space is large.
At present, the total optical length of a lens matched with a high-definition chip with more than one third of an inch is less than 36mm, the visual angle is often less than 140 degrees, the whole range of a shot image is too small, so that the effect of large-range monitoring can be achieved only by installing one or even a few more lenses, and the total cost is high.
In the prior art, most lenses all adopt spherical lenses, optical distortion is easy to generate, imaging deformation is large, and pictures are fuzzy and unclear.
Therefore, a new technical solution is urgently needed to solve the above problems.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the large-target-surface ultra-wide-angle high-definition lens which is simple in structure, reasonable in design, high in definition and small in size.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a large-target-surface ultra-wide-angle high-definition lens comprises a lens barrel and a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are coaxially arranged in the lens barrel along the object space to the image space, wherein the first lens, the second lens, the third lens and the fifth lens are all glass spherical lenses with negative focal power; the fourth lens, the sixth lens and the seventh lens are all glass spherical lenses with positive focal power;
the first lens is a meniscus glass spherical lens with the front surface and the rear surface both protruding towards the object space, the effective aperture value of the first lens is larger than 13mm, the curvature radius of the front surface facing the object space is 13< R <20mm, and the curvature radius of the rear surface facing the image space is 3< R <5 mm; the first lens has a center thickness of 0.5< CT <2 mm;
the second lens is a meniscus glass spherical lens with the front surface and the rear surface both protruding to the object space, the effective caliber value of the second lens is more than 6.5mm, the curvature radius of the front surface facing to the object space is 4.5< R <7mm, and the curvature radius of the rear surface facing to the image space is 3< R <4 mm; the second lens has a center thickness of 1< CT <2.5 mm;
the third lens is a meniscus glass spherical lens with the front surface and the rear surface both protruding towards the object space, the effective aperture value of the third lens is more than 4mm, the curvature radius of the front surface facing the object space is 8< R <15mm, and the curvature radius of the rear surface facing the image space is 3< R <5 mm; the third lens has a center thickness of 0.4< CT <1 mm;
the fourth lens is a double-convex glass spherical lens with a front surface convex to an object space and a rear surface convex to an image space, the effective aperture value of the fourth lens is more than 4mm, the curvature radius of the front surface of the fourth lens facing the object space is 4< R <6mm, and the curvature radius of the rear surface of the fourth lens facing the image space is-100 mm; the fourth lens has a center thickness of 0.8< CT <1.5 mm;
the fifth lens is a biconcave glass spherical mirror with a front surface convex to the image space and a rear surface convex to the object space, the effective aperture value of the fifth lens is more than 3.5mm, the curvature radius of the front surface of the fifth lens facing the object space is-40 < R < -100mm, and the curvature radius of the rear surface of the fifth lens facing the image space is 6< R <9 mm; the fifth lens has a center thickness of 2.5< CT <3.5 mm;
the sixth lens is a biconvex glass spherical lens with a front surface convex to an object space and a rear surface convex to an image space, the radius of curvature of the front surface of the sixth lens facing the object space is 6< R <9mm, and the radius of curvature of the rear surface of the sixth lens facing the image space is-4 < R < -6 mm; the sixth lens has a center thickness of 1.5< CT <2.5 mm;
the seventh lens is a biconvex glass spherical lens with a front surface convex to an object space and a rear surface convex to an image space, the radius of curvature of the front surface of the seventh lens facing the object space is 10< R <20mm, and the radius of curvature of the rear surface of the seventh lens facing the image space is-10 < R < -20 mm; the seventh lens has a center thickness of 1.5< CT <2.5 mm;
the first lens, the second lens, the third lens, the fourth lens and the fifth lens, and the sixth lens and the seventh lens are all arranged at a micro-interval, and the rear surface of the fifth lens and the front surface of the sixth lens are glued with each other;
the distance between the second lens and the two adjacent surfaces at the center of the first lens is 1.5< M <3 mm; the distance between the third lens and the adjacent two surfaces at the center of the second lens is 0.4< M <1 mm; the distance between the adjacent two surfaces at the center of the fourth lens and the third lens is 0.1< M <0.5 mm; the distance between the adjacent two surfaces at the center of the fifth lens and the fourth lens is 0.3< M <0.7 mm; the distance between the adjacent two surfaces at the center of the seventh lens and the sixth lens is 0.05< M <0.2 Mm.
In the above description, the total optical length of the lens is preferably 23Mm or less.
In the above description, it is preferable that Vd of the first lens is 49 and Nd is 1.74; vd of the second lens is 61, and Nd is 1.59; vd of the third lens is 49, Nd is 1.74; vd of the fourth lens is 21, and Nd is 1.9; vd of the fifth lens is 18, and Nd is 1.9; vd of the sixth lens is 63, and Nd is 1.6; vd of the seventh lens is 63, Nd is 1.6;
where Vd is the dispersion coefficient of each optical material and Nd is the refractive index of each optical material.
In the above description, preferably, a curvature radius of a front surface of the first lens facing the object side is 17.4mm, and a curvature radius of a rear surface of the first lens facing the image side is 3.9 mm;
the curvature radius of the front surface of the second lens facing the object space is 5.6mm, and the curvature radius of the rear surface of the second lens facing the image space is 3.3 mm;
the curvature radius of the front surface of the third lens facing the object space is 10.7mm, and the curvature radius of the rear surface of the fourth lens facing the image space is 3.6 mm;
the curvature radius of the front surface of the fourth lens facing the object space is 4.7 mm-;
the curvature radius of the front surface of the fifth lens facing the object space is-57 mm, and the curvature radius of the rear surface of the fifth lens facing the image space is 7.3 mm;
the curvature radius of the front surface of the sixth lens facing the object space is 7.3mm, and the curvature radius of the rear surface of the sixth lens facing the image space is-4.4 mm;
the curvature radius of the front surface of the seventh lens facing the object side is 12.2mm, and the curvature radius of the rear surface of the sixth lens facing the image side is-13 mm.
In the above description, it is preferable that an ink layer is formed on the surface of the first lens element other than the spherical surface of the rear surface facing the image side, and the ink layer has a thickness of 5 to 10 μm.
In the above description, the angle of view of the lens is preferably greater than 170 degrees.
The beneficial effects produced by the invention are as follows: through adopting the structural design of aforementioned first, second, third, fourth, fifth, sixth and seventh lens, the visual angle theta of this camera lens is great, can reach 170 degrees, and the diaphragm can accomplish 2.0, and the resolution is high, and it satisfies the requirement of high definition quality and can possess bigger visual angle, and specially adapted is monitored on a large scale to and be used for the resolution to join in marriage on the high definition sensitization product of 800 ten thousand pixel chips, for example: police law enforcement, frontier defense monitoring lenses, etc. Compared with the prior art, the total optical length of the lens of the product is greatly shortened, the total optical length L of the lens is less than or equal to 23mm, the overall volume is reduced, and the miniaturization requirement of the product is met. In addition, the first, second, fourth, fifth, sixth and seventh lenses of the invention are all spherical lenses, the processing process is simple, the cost is lower, and the market competitiveness is improved.
To more clearly illustrate the structural features and technical means of the present invention and the specific objects and functions attained thereby, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments:
drawings
FIG. 1: is a cross-sectional view of an assembly structure of an embodiment of the present invention;
FIG. 2: is an enlarged schematic view of the structure of the first lens in the embodiment of the present invention;
FIG. 3: is an enlarged schematic view of the structure of the second lens in the embodiment of the present invention;
FIG. 4: is an enlarged schematic view of the third lens structure in the embodiment of the present invention;
FIG. 5: is an enlarged schematic view of the structure of the fourth lens element in the embodiment of the present invention;
FIG. 6: is an enlarged schematic view of the fifth lens element according to the embodiment of the present invention;
FIG. 7: is an enlarged schematic view of the structure of the sixth lens element in the embodiment of the present invention;
FIG. 8: is an enlarged schematic view of the structure of the seventh lens in the embodiment of the present invention;
the attached drawings indicate the following: 10. a first lens, 20, a second lens, 30, a third lens, 40, a fourth lens, 50, a fifth lens, 60, a sixth lens, 70, a seventh lens, 80, a lens barrel;
r11, R12, R21, R22, R31, R32, R41, R42, R51, R52, R61, R62, R71, R72, radius of curvature;
CT13, CT23, CT33, CT43, CT53, CT63, CT73, center thickness;
m1, M2, M3, M4, M5, pitch.
Detailed Description
As shown in fig. 1-8, a large-target ultra-wide-angle high-definition lens comprises a lens barrel 80, and a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60, and a seventh lens 70 coaxially arranged in the lens barrel 80 along an object space to an image space, wherein the first lens 10, the second lens 20, the third lens 30, and the fifth lens 50 are all glass spherical lenses with negative focal power; the fourth lens 40, the sixth lens 60 and the seventh lens 70 are all glass spherical lenses with positive focal power, the first lens 10, the second lens 20, the third lens 30, the fourth lens 40 and the fifth lens 50, and the sixth lens 60 and the seventh lens 70 are all arranged at a micro-distance from each other, and the rear surface of the fifth lens 50 and the front surface of the sixth lens 60 are glued with each other;
the first lens 10 is a meniscus glass spherical lens with a front surface 11 and a rear surface 12 both protruding towards an object space, the effective aperture value of the first lens 10 is larger than 13mm, the Vd of the first lens 10 is 49, and the Nd is 1.74; the radius of curvature of its object-oriented front surface 11 is 13< R11<20mm, and the radius of curvature of its image-oriented rear surface 12 is 3< R12<5 mm; the center thickness of the first lens 10 is 0.5< CT13<2mm, the curvature radius R11 of the front surface 11 facing the object side is 17.4mm, and the curvature radius R12 of the rear surface 12 facing the image side is 3.9mm in the present embodiment; the central thickness CT13 of the first lens 10 is 1.2 mm. An ink layer is formed outside the spherical surface of the rear surface 12 of the first lens 10 facing the image side, and the thickness of the ink layer is 0.005 mm.
The second lens 20 is a meniscus glass spherical lens with a front surface 21 and a rear surface 22 both protruding towards the object space, the effective caliber value of the second lens 20 is more than 6.5mm, the Vd of the second lens 20 is 61, and the Nd is 1.59; its object-side facing front surface 21 has a radius of curvature of 4.5< R21<7mm, and its image-side facing rear surface 22 has a radius of curvature of 3< R22<4 mm; the center thickness of the second lens 20 is 1< CT23<2.5mm, the curvature radius R21 of the front surface 21 facing the object side is 5.6mm, and the curvature radius R22 of the rear surface 22 facing the image side is 3.3mm in the present embodiment; the central thickness CT23 of the second lens 20 is 1.9 mm. The distance M1 between the adjacent two surfaces of the second lens 20 and the center of the first lens 10 is 2.4 Mm.
The third lens 30 is a meniscus glass spherical lens with a front surface 31 and a rear surface 32 both protruding towards the object space, the effective aperture value of the third lens 30 is more than 4mm, the Vd of the third lens 30 is 49, and the Nd is 1.74; its front surface 31 facing the object has a radius of curvature of 8< R31<15mm, its rear surface 32 facing the image has a radius of curvature of 3< R32<5 mm; the third lens 30 has a center thickness of 0.4< CT33<1mm, a radius of curvature R31 of the object-side front surface 31 of 10.7mm and a radius of curvature R32 of the image-side rear surface 32 of 3.6mm in the present embodiment; the third lens 30 has a central thickness CT33 of 0.5 mm. The distance M2 between the adjacent two surfaces of the third lens 30 and the second lens 20 at the center is 0.6 Mm.
The fourth lens 40 is a biconvex glass spherical lens with a front surface protruding to an object space 41 and a rear surface 42 protruding to an image space, the effective aperture value of the fourth lens 40 is more than 4mm, the Vd of the fourth lens 40 is 21, and the Nd is 1.9; its object-oriented front surface 41 has a radius of curvature of 4< R41<6mm and its image-oriented rear surface 42 has a radius of curvature of-100 mm; the center thickness of the fourth lens 40 is 0.8< CT43<1.5mm, and the curvature radius R41 of the front surface 41 facing the object space is 4.7mm in the present embodiment; the central thickness CT42 of the fourth lens 40 is 1.2 mm; the distance M3 between the adjacent surfaces of the fourth lens element 40 and the third lens element 30 is 0.2 mm.
The fifth lens 50 is a biconcave glass spherical mirror with a front surface 51 convex to the image side and a rear surface 52 convex to the object side, the effective aperture value of the fifth lens 50 is more than 3.5mm, Vd of the fifth lens 50 is 21, and Nd is 1.9; its object-oriented front surface 51 has a radius of curvature of-40 < R51< -100mm and its image-oriented rear surface 52 has a radius of curvature of 6< R52<9 mm; the center thickness of the fifth lens 50 is 2.5< CT53<3.5mm, the curvature radius R51 of the front surface 51 facing the object side is-57 mm, and the curvature radius R52 of the rear surface 52 facing the image side is 7.3mm in the present embodiment; the central thickness CT53 of the fifth lens element 50 is 3mm, and the distance M4 between the adjacent two surfaces of the fifth lens element 50 and the fourth lens element 40 is 0.45 mm.
The sixth lens element 60 is a double-convex spherical glass lens with a front surface 61 convex toward the object side and a rear surface 62 convex toward the image side, and the sixth lens element 60 has an abbe number Vd of 18 and a refractive index Nd of 1.9; its front surface 61 facing the object has a radius of curvature of 6< R61<9mm and its rear surface 62 facing the image has a radius of curvature of-4 < R62< -6 mm; the sixth lens 60 has a center thickness of 1.5< CT63<2.5 mm; in the present embodiment, the radius of curvature R61 of its object-side facing front surface 61 is 7.3mm, and the radius of curvature R62 of its image-side facing rear surface 62 is-4.4 mm; the central thickness CT63 of the sixth lens element 60 is 2Mm, and the front surface 61 of the sixth lens element 60 is bonded to the rear surface 52 of the fifth lens element 50.
The seventh lens 70 is a double-convex glass spherical lens with a front surface 71 convex to the object side and a rear surface 72 convex to the image side, the dispersion coefficient Vd of the seventh lens 70 is 63, and the refractive index Nd is 1.6; its object-oriented front surface 71 has a radius of curvature of 10< R71<20mm and its image-oriented rear surface 72 has a radius of curvature of-10 < R72< -20 mm; the center thickness of the seventh lens 70 is 1.5< CT73<2.5 mm; in the present embodiment, the radius of curvature R71 of the object-side front surface 71 is 12.2mm, and the radius of curvature R72 of the image-side rear surface 72 is-13 mm; the central thickness CT73 of the seventh lens 70 is 1.7 mm; the distance M5 between the adjacent two surfaces of the seventh lens 70 and the sixth lens 60 is 0.05 mm;
in particular, when the curvature radius R11 of the object-side front surface 11 of the first lens 10 is 17.4mm, the curvature radius R12 of the object-side rear surface 12 of the first lens 10 is 3.9 mm; the curvature radius R21 of the front surface 21 facing the image side of the second lens 20 is 5.6mm, and the curvature radius R22 of the rear surface 22 facing the object side of the second lens 20 is 3.3 mm; the radius of curvature R31 of the front image-facing surface 31 of the third lens 30 is 10.7mm, the radius of curvature R32 of the rear object-facing surface 32 of the third lens 30 is 3.6mm, the radius of curvature R41 of the front object-facing surface 41 of the fourth lens 40 is 4.7mm, and the radius of curvature R42 of the rear image-facing surface 42 of the fourth lens 40 is-100 mm; the curvature radius R51 of the front surface 51 facing the image side of the fifth lens 50 is-57 mm, and the curvature radius R52 of the rear surface 52 facing the object side of the fifth lens 50 is 7.3 mm; the radius of curvature R61 of the object-side front surface 61 of the sixth lens 60 is 7.3mm, the radius of curvature R62 of the image-side rear surface 62 of the sixth lens 60 is-4.4 mm, the radius of curvature R71 of the image-side front surface 71 of the seventh lens 70 is 12.2mm, and the radius of curvature R72 of the object-side rear surface 72 of the seventh lens 70 is-13 mm.
The first lens 10 has a center thickness CT13 of 1.2 mm; the central thickness CT23 of the second lens 20 is 1.9 mm; the third lens 30 has a center thickness CT33 of 0.5 mm; the central thickness CT43 of the fourth lens 40 is 1.2 mm; the central thickness CT53 of the fifth lens 50 is 3 mm; the sixth lens 60 has a center thickness CT63 of 2 mm; the central thickness CT73 of the seventh lens 70 is 1.9 mm. The aperture of the lens can be 2.0, the visual angle theta of the lens can reach 170 degrees, and the optical total length of the lens is smaller than or equal to 23 mm.
In summary, the design of the present invention is focused on that, by adopting the structural design of the first, second, third, fourth, fifth, sixth, and seventh lenses, the total optical length of the lens is smaller than or equal to 23mm, the viewing angle θ of the lens is larger and can reach 170 degrees, the aperture can be 2.0, the resolution is high, the lens meets the requirement of high definition quality, has a larger viewing angle, is suitable for large-scale monitoring, is particularly suitable for a high definition photosensitive product with a resolution of 800 ten thousand pixel chips, and meets the requirement of motion shooting.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the present invention, so that any modifications, equivalents, improvements, etc. made to the above embodiment according to the present invention are within the scope of the present invention.
Claims (6)
1. The utility model provides a big super wide angle high definition camera lens of target surface which characterized in that: the lens comprises a lens barrel and a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are coaxially arranged in the lens barrel along the object space to the image space, wherein the first lens, the second lens, the third lens and the fifth lens are all glass spherical lenses with negative focal power; the fourth lens, the sixth lens and the seventh lens are all glass spherical lenses with positive focal power;
the first lens is a meniscus glass spherical lens with the front surface and the rear surface both protruding towards the object space, the effective aperture value of the first lens is larger than 13mm, the curvature radius of the front surface facing the object space is 13< R <20mm, and the curvature radius of the rear surface facing the image space is 3< R <5 mm; the first lens has a center thickness of 0.5< CT <2 mm;
the second lens is a meniscus glass spherical lens with the front surface and the rear surface both protruding to the object space, the effective caliber value of the second lens is more than 6.5mm, the curvature radius of the front surface facing to the object space is 4.5< R <7mm, and the curvature radius of the rear surface facing to the image space is 3< R <4 mm; the second lens has a center thickness of 1< CT <2.5 mm;
the third lens is a meniscus glass spherical lens with the front surface and the rear surface both protruding towards the object space, the effective aperture value of the third lens is more than 4mm, the curvature radius of the front surface facing the object space is 8< R <15mm, and the curvature radius of the rear surface facing the image space is 3< R <5 mm; the third lens has a center thickness of 0.4< CT <1 mm;
the fourth lens is a double-convex glass spherical lens with a front surface convex to an object space and a rear surface convex to an image space, the effective aperture value of the fourth lens is more than 4mm, the curvature radius of the front surface of the fourth lens facing the object space is 4< R <6mm, and the curvature radius of the rear surface of the fourth lens facing the image space is-100 mm; the fourth lens has a center thickness of 0.8< CT <1.5 mm;
the fifth lens is a biconcave glass spherical mirror with a front surface convex to the image space and a rear surface convex to the object space, the effective aperture value of the fifth lens is more than 3.5mm, the curvature radius of the front surface of the fifth lens facing the object space is-40 < R < -100mm, and the curvature radius of the rear surface of the fifth lens facing the image space is 6< R <9 mm; the fifth lens has a center thickness of 2.5< CT <3.5 mm;
the sixth lens is a biconvex glass spherical lens with a front surface convex to an object space and a rear surface convex to an image space, the radius of curvature of the front surface of the sixth lens facing the object space is 6< R <9mm, and the radius of curvature of the rear surface of the sixth lens facing the image space is-4 < R < -6 mm; the sixth lens has a center thickness of 1.5< CT <2.5 mm;
the seventh lens is a biconvex glass spherical lens with a front surface convex to an object space and a rear surface convex to an image space, the radius of curvature of the front surface of the seventh lens facing the object space is 10< R <20mm, and the radius of curvature of the rear surface of the seventh lens facing the image space is-10 < R < -20 mm; the seventh lens has a center thickness of 1.5< CT <2.5 mm;
the first lens, the second lens, the third lens, the fourth lens and the fifth lens, and the sixth lens and the seventh lens are all arranged at a micro-interval, and the rear surface of the fifth lens and the front surface of the sixth lens are glued with each other;
the distance between the second lens and the two adjacent surfaces at the center of the first lens is 1.5< M <3 mm; the distance between the third lens and the adjacent two surfaces at the center of the second lens is 0.4< M <1 mm; the distance between the adjacent two surfaces at the center of the fourth lens and the third lens is 0.1< M <0.5 mm; the distance between the adjacent two surfaces at the center of the fifth lens and the fourth lens is 0.3< M <0.7 mm; the distance between the adjacent two surfaces at the center of the seventh lens and the sixth lens is 0.05< M <0.2 Mm.
2. The large-target-surface ultra-wide-angle high-definition lens as claimed in claim 1, wherein: the total optical length of the lens is less than or equal to 23 Mm.
3. The large-target-surface ultra-wide-angle high-definition lens as claimed in claim 1, wherein: vd of the first lens is 49, and Nd is 1.74; vd of the second lens is 61, and Nd is 1.59; vd of the third lens is 49, Nd is 1.74; vd of the fourth lens is 21, and Nd is 1.9; vd of the fifth lens is 18, and Nd is 1.9; vd of the sixth lens is 63, and Nd is 1.6; vd of the seventh lens is 63, Nd is 1.6;
where Vd is the dispersion coefficient of each optical material and Nd is the refractive index of each optical material.
4. The large-target-surface ultra-wide-angle high-definition lens as claimed in claim 1, wherein: the curvature radius of the front surface of the first lens facing the object space is 17.4mm, and the curvature radius of the rear surface of the first lens facing the image space is 3.9 mm;
the curvature radius of the front surface of the second lens facing the object space is 5.6mm, and the curvature radius of the rear surface of the second lens facing the image space is 3.3 mm;
the curvature radius of the front surface of the third lens facing the object space is 10.7mm, and the curvature radius of the rear surface of the fourth lens facing the image space is 3.6 mm;
the curvature radius of the front surface of the fourth lens facing the object space is 4.7 mm;
the curvature radius of the front surface of the fifth lens facing the object space is-57 mm, and the curvature radius of the rear surface of the fifth lens facing the image space is 7.3 mm;
the curvature radius of the front surface of the sixth lens facing the object space is 7.3mm, and the curvature radius of the rear surface of the sixth lens facing the image space is-4.4 mm;
the curvature radius of the front surface of the seventh lens facing the object side is 12.2mm, and the curvature radius of the rear surface of the sixth lens facing the image side is-13 mm.
5. The large-target-surface ultra-wide-angle high-definition lens as claimed in claim 1, wherein: and an ink coating layer is formed outside the spherical surface of the rear surface of the first lens facing the image space, and the thickness of the ink coating layer is 5-10 mu m.
6. The large-target-surface ultra-wide-angle high-definition lens as claimed in claim 1, wherein: the visual angle of the lens is larger than 170 degrees.
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| JP5369867B2 (en) * | 2009-04-24 | 2013-12-18 | 株式会社リコー | Wide angle lens and imaging device |
| JP5594107B2 (en) * | 2010-12-09 | 2014-09-24 | 株式会社リコー | Reading lens, image reading apparatus, and image forming apparatus |
| JP6376561B2 (en) * | 2014-10-29 | 2018-08-22 | カンタツ株式会社 | Imaging lens |
| TWI534471B (en) * | 2015-05-12 | 2016-05-21 | 亞太精密工業（深圳）有限公司 | Wide-angle lens |
| CN104880808B (en) * | 2015-06-12 | 2017-12-22 | 中山联合光电科技股份有限公司 | A kind of small perspective distortion, ultra-wide angle optical system |
| US10551593B2 (en) * | 2016-04-08 | 2020-02-04 | Young Optics Inc. | Optical lens |
| CN108663783B (en) * | 2018-08-28 | 2023-10-10 | 深圳市特莱斯光学有限公司 | Large-aperture low-cost panoramic fisheye lens |
-
2018
- 2018-10-23 CN CN201811238309.9A patent/CN109358404B/en active Active
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