CN107632379A - Small-sized ultra-large aperture starlight level ultra-wide angle zoom lens - Google Patents
Small-sized ultra-large aperture starlight level ultra-wide angle zoom lens Download PDFInfo
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Abstract
The invention belongs to field of optical device technology, a kind of more particularly to small-sized ultra-large aperture starlight level ultra-wide angle zoom lens, including the compensation group, fixed group and zoom group being arranged in order from the object side to the image side, total focal power of compensation group is negative, total focal power of fixed group is just, total focal power of zoom group meets following relational expression for just between the focal length Ff' of compensation group and the focal length Bf' of zoom group：0.35<|Ff'/Bf'|<1.87.Relative to prior art, the present invention adds the optical texture of 2 Glass aspheric eyeglasses using three constituent elements, 8 glass spheric glasses, F1.0 super large apertures can be reached, more than 3.5 times of zoom ratio, visual field scope is less than 32 degree to more than 145 degree, while possesses resolution ratio more than 6,000,000 pixels, and optics overall length is less than 51mm, whole camera lens perfectly combines performance with volume, possesses wide market prospects.
Description
Technical Field
The invention belongs to the technical field of optical devices, and particularly relates to a small ultra-large aperture starlight-level ultra-wide angle zoom lens.
Background
The concept of the starlight level gradually deepens people in the security industry, and compared with a black and white mode of a traditional monitoring camera in the daytime at a color and at night, the day and night full-color picture brings completely different effects for security monitoring. The hardware base of the starlight level camera must rely on a starlight level imaging chip with high sensitivity and a large-aperture optical lens. The current common wide-angle zoom lens generally has an aperture of F1.6-1.8, and the resolution can meet the requirement of 3 million pixels. However, this is still insufficient for the concept of star level, so that it is necessary to develop a new type of wide-angle zoom lens to meet the requirement of star level.
In addition, the wide-angle zoom lens has a wide visual field, so that a target in a wider range can be monitored, but the off-axis aberration which is difficult to correct is brought by an ultra-large visual angle, and the focusing difficulty of the wide-angle zoom lens with an ultra-large aperture is doubled. Moreover, most of the conventional wide-angle zoom lenses adopt a two-element optical system, and the structure has the advantage of simple structure, so that the wide-angle zoom lens is widely applied to the conventional optical system with low requirements on magnification and relative aperture, and can generally obtain a result of better image quality. However, the relatively simple structure cannot be balanced in terms of magnification, relative aperture, image quality, and volume in the application of a large-aperture optical system.
In view of the above, the present invention aims to provide a small-sized ultra-large aperture star-level ultra-wide angle zoom lens, which adopts an optical structure of three components, 8 glass spherical lenses and 2 glass aspheric lenses, and can achieve F1.0 ultra-large aperture, a zoom magnification of more than 3.5 times, a field angle range of 32 degrees or less and 145 degrees or more, and simultaneously has a resolution of more than 600 ten thousand pixels, an optical total length of less than 51mm, and the whole lens perfectly combines performance and volume, thereby having a broad market prospect.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, the small-sized ultra-large-aperture star-light-level ultra-wide-angle zoom lens adopts an optical structure comprising three components, 8 glass spherical lenses and 2 glass aspheric lenses, can achieve F1.0 ultra-large aperture and zoom magnification of more than 3.5 times, has a field angle range of 32 degrees to 145 degrees, has resolution of more than 600 ten thousand pixels, has an optical total length of less than 51mm, perfectly combines the performance and the volume, and has wide market prospect.
In order to achieve the purpose, the invention adopts the following technical scheme:
the small-size super large aperture star optical level super wide-angle zoom lens includes compensation group, fixed group and the variable power group that arrange in proper order from the object space to the image space, the total focal power of compensation group is the burden, the total focal power of fixed group is positive, the total focal power of variable power group is positive, and the focus Ff 'of compensation group with satisfy following relational expression between the focus Bf' of variable power group: 0.35< | Ff '/Bf' | <1.87; the zooming purpose is achieved by changing the relative positions of the zooming group and the compensation group, and the zooming ratio of the focal length is larger than 3.5.
The focal lengths Gf' of the fixed group and fw and ft respectively satisfy the following relations: 6< | Gf'/fw | <25.5;2< | Gf'/ft | <15.3; where fw is a focal length of the lens at the wide-angle end, and ft is a focal length of the lens at the telephoto end.
As an improvement of the small-sized ultra-large aperture star-level ultra-wide-angle zoom lens, the compensation group comprises a first lens, a second lens and a third lens which are sequentially arranged from an object side to an image side, wherein the first lens is a convex-concave negative power lens, the second lens is a biconcave negative power lens, and the third lens is a convex-concave positive power lens.
As an improvement of the small ultra-large aperture starlight ultra-wide angle zoom lens, the first lens, the second lens and the third lens are all glass spherical lenses, the first lens and the second lens are supported by lens edges, and the second lens and the third lens are supported by space rings.
As an improvement of the small-sized ultra-large aperture starlight ultra-wide angle zoom lens of the present invention, the fixed group includes a fourth lens with positive focal power, one surface of the fourth lens facing the object side is a convex surface, a concave surface or a flat surface, and one surface of the fourth lens facing the image side is a convex surface, a concave surface or a flat surface.
As an improvement of the small-sized ultra-large-aperture starlight ultra-wide-angle zoom lens, the fourth lens is a glass aspheric lens. When the zoom lens zooms, the aperture diaphragm and the fourth lens are fixed, and the compensation group and the zoom group can be selectively moved.
As an improvement of the small-sized ultra-large aperture starlight-level ultra-wide-angle zoom lens, the zoom group includes a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens which are sequentially arranged from an object side to an image side, the fifth lens is a double-convex positive power lens, the sixth lens is a negative power lens, one surface of the sixth lens facing the object side is a concave surface, a plane surface or a convex surface, and one surface of the sixth lens facing the image side is a concave surface; the seventh lens is a biconvex positive focal power lens, the eighth lens is a biconvex positive focal power lens, the ninth lens is a biconcave negative focal power lens, the tenth lens is a positive focal power lens, one surface of the tenth lens, facing the object space, is a convex surface, and one surface of the tenth lens, facing the image space, is a convex surface, a plane or a concave surface.
As an improvement of the small-sized ultra-large-aperture starlight ultra-wide-angle zoom lens, the fifth lens is a glass aspheric lens.
As an improvement of the small-sized ultra-large aperture starlight-level ultra-wide angle zoom lens, the fifth lens and the sixth lens are supported by a spacer, the sixth lens and the seventh lens are bonded by optical cement, the seventh lens and the eighth lens are supported by a spacer, the eighth lens and the ninth lens are bonded by optical cement, and the ninth lens and the tenth lens are supported by a spacer.
As an improvement of the small ultra-large aperture starlight-level ultra-wide angle zoom lens of the present invention, focal lengths and refractive indices of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens respectively satisfy the following conditions:
wherein f1 to f10 are focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens, respectively, and n1 to n10 are refractive indices of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens, respectively.
As an improvement of the small ultra-large aperture starlight ultra-wide angle zoom lens of the present invention, aspheric lenses of the fourth lens and the fifth lens satisfy the following formula:
wherein: z is the distance vector from the aspheric vertex at the position of height R of the aspheric surface in the optical axis direction, c =1/R, R represents the radius of curvature of the surface type center, k represents the conic coefficient, and the parameter a 1 、a 2 、a 3 、a 4 、a 5 、a 6 、a 7 、a 8 Are high-order aspheric coefficients.
Compared with the prior art, the invention can effectively reduce the volume of the lens and improve the multiplying power and the relative aperture of the lens by using three components (a compensation group, a fixed group and a variable power group) and using an optical structure of 8 glass spherical lenses and 2 glass non-spherical lenses. Meanwhile, the invention has higher resolution, and the invention, through matching the material of the lens rationally, make the lens use under-40 duC- +80 duC environment and not run the focus, can also reach the confocal and imaging definition of visible light and infrared light above 600 ten thousand pixels, the maximum aperture reaches F1.0, and have more than 3.5 times of zoom magnification, the field of view range is below 32 degrees to above 145 degrees, the optical total length is less than 51mm, the whole lens combines the performance and volume perfectly, therefore have broad market prospects.
Drawings
Fig. 1 is a schematic diagram of the optical architecture of the present invention at the wide-angle end.
FIG. 2 is a schematic view of the optical structure of the present invention at the telephoto end.
Detailed Description
The present invention and its advantageous effects will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
As shown in fig. 1 and fig. 2, the small-sized ultra-large aperture star-level ultra-wide-angle zoom lens provided by the present invention includes a compensation group, a fixed group and a zoom group, which are sequentially arranged from an object side to an image side, wherein a total focal power of the compensation group is negative, a total focal power of the fixed group is positive, a total focal power of the zoom group is positive, and a focal length Ff 'of the compensation group and a focal length Bf' of the zoom group satisfy the following relation: 0.35< | Ff '/Bf' | <1.87; the zooming purpose is achieved by changing the relative position of the zooming group and the compensation group, and the zooming ratio of the focal length is more than 3.5.
The fixed group has focal lengths Gf' and fw and ft satisfying the following relationships, respectively: 6< | Gf'/fw | <25.5;2< | Gf'/ft | <15.3; where fw is the focal length of the lens at the wide-angle end (as shown in fig. 1), and ft is the focal length of the lens at the telephoto end (as shown in fig. 2).
The compensation group comprises a first lens 1, a second lens 2 and a third lens 3 which are sequentially arranged from an object side to an image side, wherein the first lens 1 is a convex-concave negative focal power lens, the second lens 2 is a double-concave negative focal power lens, and the third lens 3 is a convex-concave positive focal power lens.
The first lens 1, the second lens 2 and the third lens 3 are all glass spherical lenses, the first lens 1 and the second lens 2 are supported by the edges of the lenses, and the second lens 2 and the third lens 3 are supported by the space ring.
The fixed group comprises a fourth lens 4 with positive focal power, one surface of the fourth lens 4 facing the object side is a convex surface, a concave surface or a plane, and one surface of the fourth lens 4 facing the image side is a convex surface, a concave surface or a plane.
The fourth lens 4 is a glass aspherical lens. When the zoom lens zooms, the aperture stop and the fourth lens 4 are fixed, and the compensation group and the zoom group can be selectively moved.
The variable power group comprises a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9 and a tenth lens 10 which are arranged in sequence from an object side to an image side, wherein the fifth lens 5 is a double-convex positive power lens, the sixth lens 6 is a negative power lens, one surface of the sixth lens 6 facing the object side is a concave surface, a plane surface or a convex surface, and one surface of the sixth lens 6 facing the image side is a concave surface; the seventh lens element 7 is a biconvex positive power lens, the eighth lens element 8 is a biconvex positive power lens, the ninth lens element 9 is a biconcave negative power lens, the tenth lens element 10 is a positive power lens, one surface of the tenth lens element 10 facing the object side is a convex surface, and one surface of the tenth lens element 10 facing the image side is a convex surface, a plane or a concave surface.
The fifth lens 5 is a glass aspherical lens. A diaphragm 11 is arranged between the fourth lens 4 and the fifth lens 5.
The fifth lens 5 and the sixth lens 6 are supported by a spacer, the sixth lens 6 and the seventh lens 7 are bonded by optical cement, the seventh lens 7 and the eighth lens 8 are supported by a spacer, the eighth lens 8 and the ninth lens 9 are bonded by optical cement, and the ninth lens 9 and the tenth lens 10 are supported by a spacer.
The focal length and refractive index of the first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5, sixth lens 6, seventh lens 7, eighth lens 8, ninth lens 9, and tenth lens 10 satisfy the following conditions, respectively:
| -16＜f1＜-6 | 1.6＜n1＜1.95 |
| -25.7＜f2＜-7.5 | 1.43＜n2＜1.85 |
| 11.2＜f3＜35.4 | 1.7＜n3＜2.15 |
| 23.5＜f4＜78.8 | 1.43＜n4＜1.89 |
| 5.9＜f5＜20.1 | 1.43＜n5＜1.75 |
| -25＜f6＜-6.3 | 1.5＜n6＜1.85 |
| 6.2＜f7＜22.3 | 1.43＜n7＜1.7 |
| 3.3＜f8＜13.8 | 1.7＜n8＜2.15 |
| -10.3＜f9＜-2.1 | 1.6＜n9＜1.95 |
| 6.1＜f10＜25.5 | 1.5＜n10＜1.9 |
wherein f1 to f10 are focal lengths of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9 and the tenth lens 10, respectively, and n1 to n10 are refractive indices of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9 and the tenth lens 10, respectively.
The aspherical lenses of the fourth lens 4 and the fifth lens 5 satisfy the following formula:
wherein: z is the distance vector from the aspheric vertex at the position of height R of the aspheric surface in the optical axis direction, c =1/R, R represents the radius of curvature of the surface type center, k represents the conic coefficient, and the parameter a 1 、a 2 、a 3 、a 4 、a 5 、a 6 、a 7 、a 8 Are high-order aspheric coefficients.
The invention can effectively reduce the volume of the lens and improve the multiplying power and the relative aperture of the lens by using three components (a compensation group, a fixed group and a variable power group) and using an optical structure of 8 glass spherical lenses and 2 glass non-spherical lenses. Meanwhile, the invention has higher resolution, and the invention can ensure that the lens can not run out of focus when used in the environment of-40 ℃ to +80 ℃ by reasonably matching the materials of the lenses, can also achieve the confocal of visible light and infrared light, has the imaging definition of more than 600 ten thousand pixels, has the maximum aperture of F1.0 and the zoom magnification of more than 3.5 times, has the field angle range of less than 32 degrees to more than 145 degrees and the total optical length of less than 51mm, and perfectly combines the performance and the volume of the whole lens, thereby having wide market prospect.
The structure of the present invention is further illustrated by the following specific example.
Example 1
In this embodiment, the surface shape, the curvature radius R, the lens thickness, the lens pitch, and the lens refractive index nd of twenty total surfaces of the ten lenses of the zoom lens satisfy the following conditions, respectively:
table 1: physical parameters of ten lenses.
In the above table, "R" is a radius of curvature, "a" - "indicates a negative direction," PL "indicates a plane, and the same plane number in the above table has both refractive index data nd and data D, the data D indicates a thickness at the axial line of the lens, the same plane number has only data D without refractive index data nd, and the data D indicates a distance from the lens to the next lens surface. Wherein, 1-19 are the surface numbers arranged in sequence from the object side to the image side. That is, surface numbers 1 and 2 correspond to a surface of the first lens 1 facing the object and a surface facing the image, surface numbers 3 and 4 correspond to a surface of the second lens 2 facing the object and a surface facing the image, surface numbers 5 and 6 correspond to a surface of the third lens 3 facing the object and a surface facing the image, surface numbers 7 and 8 correspond to a surface of the fourth lens 4 facing the object and a surface facing the image, surface numbers 10 and 11 correspond to a surface of the fifth lens 5 facing the object and a surface facing the image, surface numbers 12 and 13 correspond to a surface of the sixth lens 6 facing the object and a surface facing the image, surface numbers 14 and 15 correspond to a surface of the seventh lens 7 facing the object and a surface facing the image, surface numbers 16 and 17 correspond to a surface of the eighth lens 8 facing the object and a surface facing the image, surface numbers 18 and 19 correspond to a surface of the ninth lens 9 facing the object and a surface facing the image, surface numbers 20 and surface facing the tenth lens, respectively. The ten lenses are all made of glass.
The surface of the fourth lens element 4 facing the object side is a convex surface, and the surface of the fourth lens element 4 facing the image side is a convex surface. The sixth lens element 6 has a convex surface on a surface facing the object side, and the sixth lens element 6 has a concave surface on a surface facing the image side. The tenth lens element 10 has a convex surface facing the object side and a concave surface facing the image side.
The shape of the 7 th, 8 th, 10 th, 11 th surfaces having an aspherical surface structure therein can be expressed by the following formula:
where c =1/R, K is the K value in table 1.
Table 2: aspheric parameters of 7 th, 8 th, 10 th and 11 th surfaces.
| Number of face: 7 | Number of face: 8 | Number of face: 10 | Noodle number: 11 | |
| Alpha 1 parameter | 0 | 0 | 0 | 0 |
| Alpha 2 parameter | -1.951807E-004 | -1.681426E-004 | 1.984651E-003 | 6.921745E-003 |
| Alpha 3 parameter | -1.631690E-004 | -2.183452E-004 | -5.614720E-004 | -2.487014E-003 |
| Alpha 4 parameter | 2.1136421E-005 | 6.191472E-005 | 3.253214E-004 | 2.331472E-004 |
| Alpha 5 parameter | -3.328164E-006 | -3.554671E-006 | -3.664723E-005 | 7.213241E-006 |
| Alpha 6 parameter | -4.110247E-008 | 1.717432E-007 | 3.297412E-007 | -3.837121E-006 |
| Alpha 7 parameter | 0 | 0 | 0 | 0 |
| Alpha 8 parameter | 0 | 0 | 0 | 0 |
In conclusion, the invention can effectively reduce the volume of the lens and improve the multiplying power and the relative aperture of the lens by using three components (a compensation group, a fixed group and a variable power group) and using an optical structure of 8 glass spherical lenses and 2 glass non-spherical lenses. Meanwhile, the invention has higher resolution, and the invention can ensure that the lens can not run out of focus when used in the environment of-40 ℃ to +80 ℃ by reasonably matching the materials of the lenses, can also achieve the confocal of visible light and infrared light, has the imaging definition of more than 600 ten thousand pixels, has the maximum aperture of F1.0 and the zoom magnification of more than 3.5 times, has the field angle range of less than 32 degrees to more than 145 degrees and the total optical length of less than 51mm, and perfectly combines the performance and the volume of the whole lens, thereby having wide market prospect.
Appropriate changes and modifications to the embodiments described above will become apparent to those skilled in the art from the disclosure and teachings of the foregoing description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. Small-size super large aperture starlight level super wide angle zoom, its characterized in that: the zoom lens comprises a compensation group, a fixed group and a zoom group which are sequentially arranged from an object side to an image side, wherein the total focal power of the compensation group is negative, the total focal power of the fixed group is positive, the total focal power of the zoom group is positive, and the focal length Ff 'of the compensation group and the focal length Bf' of the zoom group satisfy the following relational expression: 0.35< | Ff '/Bf' | <1.87;
the focal lengths Gf' of the fixed group and fw and ft respectively satisfy the following relations: 6< | Gf'/fw | <25.5;2< | Gf'/ft | <15.3; where fw is a focal length of the lens at the wide-angle end, and ft is a focal length of the lens at the telephoto end.
2. The miniature ultra-large aperture starlight ultra-wide angle zoom lens of claim 1, wherein: the compensation group comprises a first lens, a second lens and a third lens which are sequentially arranged from an object side to an image side, wherein the first lens is a convex-concave negative focal power lens, the second lens is a biconcave negative focal power lens, and the third lens is a convex-concave positive focal power lens.
3. The small ultra-large aperture starlight ultra-wide angle zoom lens of claim 2, wherein: the first lens, the second lens and the third lens are all glass spherical lenses, the first lens and the second lens are supported by the edges of the lenses, and the second lens and the third lens are supported by spacer rings.
4. The miniature ultra-large aperture starlight ultra-wide angle zoom lens of claim 2, wherein: the fixed group comprises a fourth lens with positive focal power, one surface of the fourth lens, facing the object space, is a convex surface, a concave surface or a plane, and one surface of the fourth lens, facing the image space, is a convex surface, a concave surface or a plane.
5. The small ultra-large aperture star-optics ultra-wide angle zoom lens of claim 4, wherein: the fourth lens is a glass aspheric lens.
6. The miniature ultra-large aperture starlight ultra-wide angle zoom lens of claim 5, wherein: the zoom group comprises a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens which are sequentially arranged from an object side to an image side, wherein the fifth lens is a double-convex positive focal power lens, the sixth lens is a negative focal power lens, one surface of the sixth lens facing the object side is a concave surface, a plane surface or a convex surface, and one surface of the sixth lens facing the image side is a concave surface; the seventh lens is a biconvex positive focal power lens, the eighth lens is a biconvex positive focal power lens, the ninth lens is a biconcave negative focal power lens, the tenth lens is a positive focal power lens, one surface of the tenth lens facing the object space is a convex surface, and one surface of the tenth lens facing the image space is a convex surface, a plane or a concave surface.
7. The miniature ultra-large aperture starlight ultra-wide angle zoom lens of claim 6, wherein: the fifth lens is a glass aspheric lens.
8. The small ultra-large aperture starlight ultra-wide angle zoom lens of claim 6, wherein: the fifth lens and the sixth lens are supported by a spacer, the sixth lens and the seventh lens are bonded by optical cement, the seventh lens and the eighth lens are supported by a spacer, the eighth lens and the ninth lens are bonded by optical cement, and the ninth lens and the tenth lens are supported by a spacer.
9. The miniature ultra-large aperture starlight ultra-wide angle zoom lens of claim 6, wherein: the focal lengths and refractive indices of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens satisfy the following conditions, respectively:
wherein f1 to f10 are focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens, respectively, and n1 to n10 are refractive indices of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens, respectively.
10. The miniature ultra-large aperture starlight ultra-wide angle zoom lens of claim 7, wherein: the aspheric lenses of the fourth lens and the fifth lens satisfy the following formula:
wherein: z is the distance vector from the aspheric vertex at the position of height R of the aspheric surface in the optical axis direction, c =1/R, R represents the radius of curvature of the surface type center, k represents the conic coefficient, and the parameter a 1 、a 2 、a 3 、a 4 、a 5 、a 6 、a 7 、a 8 Are high-order aspheric coefficients.
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| CN106842527A (en) * | 2016-11-10 | 2017-06-13 | 嘉兴中润光学科技有限公司 | A kind of zoom lens |
| CN106597642A (en) * | 2017-01-22 | 2017-04-26 | 东莞市宇瞳光学科技股份有限公司 | Miniaturized ultra high-definition fixed-focus lens |
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