CN106772947B - DV lens with large image plane motion - Google Patents
DV lens with large image plane motionDownload PDFInfo
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- CN106772947B CN106772947BCN201710054189.6ACN201710054189ACN106772947BCN 106772947 BCN106772947 BCN 106772947BCN 201710054189 ACN201710054189 ACN 201710054189ACN 106772947 BCN106772947 BCN 106772947B
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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
- 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
- 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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Abstract
Description
Technical Field
The invention belongs to the technical field of optical devices, and particularly relates to a DV lens with large image plane motion.
Background
Motion DV cameras, which are used more and more widely in outdoor activities, are different from conventional cameras because they are used in various harsh environments and only one fixed-focus lens is used, so that the requirement for the pixels of the camera chip is very high. Meanwhile, the motion DV camera has strict requirements on the lens, the traditional monitoring lens has lower pixel ratio and small phase area, and the image quality at the edge of the lens is reduced very fast along with the increase of the angle.
In view of the above, it is necessary to provide a DV lens with large image plane motion, which adopts a 7G glass lens (seven glass lenses) structure, fully utilizes the advantages of easy processing of the glass lenses, chromatic aberration elimination of the cemented lenses and image quality improvement, makes the lens pixels reach 1600W, and has the advantages of large depth of field and large phase plane.
Disclosure of Invention
The invention aims to: the DV lens with the large image plane motion is provided to overcome the defects in the prior art, adopts a 7G glass lens (seven glass lenses) structure, fully exerts the advantages of easy processing of the glass lenses, chromatic aberration elimination of the cemented lenses and image quality improvement, enables the lens pixels to reach 1600W, and has the advantages of large depth of field and large phase plane.
In order to achieve the purpose, the invention adopts the following technical scheme:
the DV lens with large image plane motion comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from an object space to an image space, wherein the first lens is a convex-concave negative power glass spherical lens, the second lens is a biconcave negative power glass spherical lens, the third lens is a biconvex positive power glass spherical lens, the fourth lens is a biconvex positive power glass spherical lens, and the fifth lens is a biconcave negative power glass spherical lens; the sixth lens is a plano-convex positive focal power glass spherical lens, and the seventh lens is a double-convex positive focal power glass spherical lens;
the fourth lens and the fifth lens are connected in a gluing mode;
the ratio of the focal lengths of the fourth lens and the fifth lens to the focal length of the whole lens meets the following condition:
0.8＜|f4/f|＜1.0；
0.65＜|f5/f|＜0.8；
wherein f is the focal length of the entire lens; f4 is the focal length of the fourth lens; f5 is the focal length of the fifth lens.
As an improvement of the DV lens with large image plane movement according to the present invention, the focal length, refractive index, and radius of curvature of the first lens to the seventh lens satisfy the following conditions:
| -7.1≤f1≤-5.3 | 1.65≤n1≤1.82 | 17≤R1≤19 | 3.5≤R2≤4.5 |
| -7.3≤f2≤-5.8 | 1.45≤n2≤1.62 | -10≤R3≤-8 | 4.0≤R4≤6.5 |
| 5.2≤f3≤6.3 | 1.80≤n3≤1.95 | 5≤R5≤7 | -21≤R6≤-19 |
| 2.1≤f4≤3.2 | 1.65≤n4≤1.82 | 7.2≤R7≤8.2 | -3≤R8≤-2 |
| -3.5≤f5≤-1.8 | 1.65≤n5≤1.82 | -3≤R9≤-2 | 8.5≤R10≤9.6 |
| 7.9≤f6≤9.2 | 1.65≤n6≤1.82 | R11=∞ | -8≤R12≤-6 |
| 10.2≤f7≤12.3 | 1.85≤n7≤2.05 | 12.2≤R13≤14.1 | -60≤R14≤-40 |
in the above table, "f" is the focal length, "n" is the refractive index, "R" is the radius of curvature, and the "-" number indicates that the direction is negative;
wherein f1 to f7 correspond to focal lengths of the first to seventh lenses, respectively; n1 to n7 correspond to refractive indices of the first lens to the seventh lens, respectively; r1, R3, R5, R7, R9, R11, and R13 correspond to radii of curvature of the surfaces of the first to seventh lenses close to the object side, respectively, and R2, R4, R6, R8, R10, R12, and R14 correspond to radii of curvature of the surfaces of the first to seventh lenses far from the object side, respectively.
As an improvement of the DV lens with large image plane movement, the first lens and the second lens are directly abutted.
As an improvement of the DV lens with large image plane movement, the second lens and the third lens are tightly matched through a space ring.
As an improvement of the large image plane motion DV lens of the present invention, the third lens and the fourth lens are tightly fitted through a spacer.
As an improvement of the DV lens with large image plane movement according to the present invention, the fifth lens directly abuts against the sixth lens.
As an improvement of the DV lens with large image plane movement, the sixth lens and the seventh lens are tightly fitted through a spacer.
Compared with the prior art, the invention has the following advantages:
firstly, the invention adopts a 7G glass lens (seven glass lenses) structure, fully exerts the advantages of easy processing of the glass lenses, chromatic aberration elimination of the cemented lenses and image quality improvement, enables the lens pixels to reach 1600W, and has the advantages of large depth of field and large phase area.
Secondly, the invention realizes a large image surface of 1/2.3' through reasonably using the glass lens and the adhesive sheet, the imaging quality is excellent, and the light transmission is F2.5. The depth of field of the lens is large, namely the lens is not out of focus in a slight out-of-focus state, and the lens can be clearly focused from a near object distance of 1 meter to an infinite object distance without focusing again, so that the special requirements of motion DV on image quality and environment can be met.
In a word, the invention has compact structure and high imaging quality, and can ensure the image quality in a large depth of field range.
Drawings
FIG. 1 is a schematic view of an optical structure according to the present invention.
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, the DV lens with large image plane movement provided by the present invention includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6 and a seventh lens 7, which are sequentially arranged from an object space to an image space, wherein the first lens 1 is a convex-concave negative power glass spherical lens, the second lens 2 is a double-concave negative power glass spherical lens, the third lens 3 is a double-convex positive power glass spherical lens, the fourth lens 4 is a double-convex positive power glass spherical lens, and the fifth lens 5 is a double-concave negative power glass spherical lens; the sixth lens 6 is a plano-convex positive focal power glass spherical lens, and the seventh lens 7 is a double-convex positive focal power glass spherical lens;
the fourth lens 4 and the fifth lens 5 are connected in a gluing mode; namely, the invention relates to a fixed focus lens comprising 6 groups of seven-piece lens structures.
The ratio of the focal lengths of the fourth lens 4 and the fifth lens 5 to the focal length of the entire lens satisfies the following condition:
0.8＜|f4/f|＜1.0；
0.65＜|f5/f|＜0.8；
wherein f is the focal length of the entire lens; f4 is the focal length of the fourth lens 4; f5 is the focal length of the fifth lens 5 to achieve the efficacy of high pixel and large image plane.
The focal length, refractive index, and radius of curvature of the first lens 1 to the seventh lens 7 satisfy the following conditions:
| -7.1≤f1≤-5.3 | 1.65≤n1≤1.82 | 17≤R1≤19 | 3.5≤R2≤4.5 |
| -7.3≤f2≤-5.8 | 1.45≤n2≤1.62 | -10≤R3≤-8 | 4.0≤R4≤6.5 |
| 5.2≤f3≤6.3 | 1.80≤n3≤1.95 | 5≤R5≤7 | -21≤R6≤-19 |
| 2.1≤f4≤3.2 | 1.65≤n4≤1.82 | 7.2≤R7≤8.2 | -3≤R8≤-2 |
| -3.5≤f5≤-1.8 | 1.65≤n5≤1.82 | -3≤R9≤-2 | 8.5≤R10≤9.6 |
| 7.9≤f6≤9.2 | 1.65≤n6≤1.82 | R11=∞ | -8≤R12≤-6 |
| 10.2≤f7≤12.3 | 1.85≤n7≤2.05 | 12.2≤R13≤14.1 | -60≤R14≤-40 |
in the above table, "f" is the focal length, "n" is the refractive index, "R" is the radius of curvature, and the "-" number indicates that the direction is negative;
wherein f1 to f7 correspond to focal lengths of the first lens 1 to the seventh lens 7, respectively; n1 to n7 correspond to refractive indices of the first lens 1 to the seventh lens 7, respectively; r1, R3, R5, R7, R9, R11, and R13 correspond to the radii of curvature of the surfaces of the first to seventh lenses 1 to 7 close to the object side, respectively, and R2, R4, R6, R8, R10, R12, and R14 correspond to the radii of curvature of the surfaces of the first to seventh lenses 1 to 7 far from the object side, respectively.
The first lens 1 is directly abutted against the second lens 2, the second lens 2 is tightly matched with the third lens 3 through a spacer, the third lens 3 is tightly matched with the fourth lens 4 through a spacer, the fifth lens 5 is directly abutted against the sixth lens 6, and the sixth lens 6 is tightly matched with the seventh lens 7 through a spacer.
Example 1
As shown in fig. 1, the present embodiment provides a large image plane motion DV lens, which includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, and a seventh lens 7, which are arranged in sequence from an object side to an image side, wherein the first lens 1 is a convex-concave negative power glass spherical lens, the second lens 2 is a double-concave negative power glass spherical lens, the third lens 3 is a double-convex positive power glass spherical lens, the fourth lens 4 is a double-convex positive power glass spherical lens, and the fifth lens 5 is a double-concave negative power glass spherical lens; the sixth lens 6 is a plano-convex positive focal power glass spherical lens, and the seventh lens 7 is a double-convex positive focal power glass spherical lens; the fourth lens 4 and the fifth lens 5 are cemented.
The surface type, the radius of curvature R, the lens thickness, the lens pitch, and the lens refractive index nd of each lens satisfy the following conditions (table 1), respectively:
in table 1, "R" is a radius of curvature, "a" - "indicates a negative direction," PL "indicates a plane on which both refractive index data nd and data D are assigned to the same plane, data D indicates a thickness at the axial line of the lens, the same plane is assigned only data D without refractive index data nd, and data D indicates a distance from the lens to the next lens plane. The surface numbers 1 and 2 correspond to the surface of the first lens 1 facing the object side and the surface facing the image side, respectively; the surface numbers 3 and 4 correspond to the surface of the second lens 2 facing the object and the surface facing the image, respectively; the surface numbers 5 and 6 correspond to the object side surface and the image side surface of the third lens element 3, respectively; the surface numbers 7 and 8 correspond to the object side surface and the image side surface of the fourth lens element 4, respectively; the surface numbers 9 and 10 correspond to the object side surface and the image side surface of the fifth lens 5, the surface numbers 11 and 12 correspond to the object side surface and the image side surface of the sixth lens 6, and the surface numbers 13 and 14 correspond to the object side surface and the image side surface of the seventh lens 7, respectively.
In summary, the present invention has the following advantages:
firstly, the invention adopts a 7G glass lens (seven glass lenses) structure, fully exerts the advantages of easy processing of the glass lenses, chromatic aberration elimination of the cemented lenses and image quality improvement, enables the lens pixels to reach 1600W, and has the advantages of large depth of field and large phase area.
Secondly, the invention realizes 1/2.3' of large image surface by reasonably using the glass lens and the adhesive sheet, and has excellent imaging quality and light transmission F2.5. The depth of field of the lens is large, namely the lens is not out of focus in a slight out-of-focus state, and the lens can be clearly focused from a near object distance of 1 meter to an infinite object distance without focusing again, so that the special requirements of motion DV on image quality and environment can be met.
In a word, the invention has compact structure and high imaging quality, and can ensure the image quality in a large depth of field range.
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 (6)
1. Big image plane motion DV camera lens, its characterized in that: the optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from an object space to an image space, wherein the first lens is a convex-concave negative focal power glass spherical lens, the second lens is a biconcave negative focal power glass spherical lens, the third lens is a biconvex positive focal power glass spherical lens, the fourth lens is a biconvex positive focal power glass spherical lens, and the fifth lens is a biconcave negative focal power glass spherical lens; the sixth lens is a plano-convex positive focal power glass spherical lens, and the seventh lens is a double-convex positive focal power glass spherical lens;
the fourth lens and the fifth lens are connected in a gluing mode;
the ratio of the focal lengths of the fourth lens and the fifth lens to the focal length of the whole lens meets the following condition:
0.8＜|f4/f|＜1.0；
0.65＜|f5/f|＜0.8；
the focal length, refractive index and radius of curvature of the first lens to the seventh lens satisfy the following conditions:
in the above table, f is the focal length of the entire lens, "n" is the refractive index, "R" is the radius of curvature, and the "-" number indicates that the direction is negative;
wherein f1 to f7 correspond to focal lengths of the first to seventh lenses, respectively; n1 to n7 correspond to refractive indices of the first lens to the seventh lens, respectively; r1, R3, R5, R7, R9, R11, and R13 correspond to radii of curvature of the surfaces of the first to seventh lenses close to the object side, respectively, and R2, R4, R6, R8, R10, R12, and R14 correspond to radii of curvature of the surfaces of the first to seventh lenses far from the object side, respectively.
2. The large image plane motion DV lens according to claim 1, wherein: the first lens is in direct abutment with the second lens.
3. The large image plane motion DV lens according to claim 1, wherein: the second lens and the third lens are tightly matched through a space ring.
4. The large image plane motion DV lens according to claim 1, wherein: the third lens and the fourth lens are tightly matched through a space ring.
5. The large image plane motion DV lens according to claim 1, wherein: the fifth lens is in direct abutment with the sixth lens.
6. The large image plane motion DV lens according to claim 1, wherein: the sixth lens and the seventh lens are tightly matched through a spacer ring.
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| CN201710054189.6ACN106772947B (en) | 2017-01-22 | 2017-01-22 | DV lens with large image plane motion |
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| CN201710054189.6ACN106772947B (en) | 2017-01-22 | 2017-01-22 | DV lens with large image plane motion |
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| CN108873270B (en)* | 2018-07-13 | 2024-04-12 | 舜宇光学(中山)有限公司 | Glass-plastic mixed prime lens |
| CN109557644B (en)* | 2019-01-24 | 2021-10-22 | 宁波舜宇车载光学技术有限公司 | Optical lens and imaging apparatus |
| CN110045486B (en)* | 2019-05-14 | 2024-03-29 | 厦门力鼎光电股份有限公司 | Optical imaging lens |
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| CN110737075B (en)* | 2019-11-20 | 2025-04-25 | 杭州图谱光电科技有限公司 | A high-pixel, large-aperture, all-glass motion DV lens |
| CN111580251B (en)* | 2020-05-22 | 2022-02-08 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
| CN111580252B (en)* | 2020-05-22 | 2022-04-22 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
| CN115291365A (en)* | 2022-08-22 | 2022-11-04 | 信华精机有限公司 | Optical system with large aperture and vehicle-mounted camera device |
| CN118818719A (en)* | 2024-08-06 | 2024-10-22 | 广东弘景光电科技股份有限公司 | A low-distortion, wide-angle, high-resolution vehicle-mounted forward-looking optical system and a camera module used therein |
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| CN202735577U (en)* | 2012-08-07 | 2013-02-13 | 厦门力鼎光电技术有限公司 | Mini type day and night dual-use zoom lens |
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