CN113204106B - Wide-width high-resolution visible light lens optical system - Google Patents
Wide-width high-resolution visible light lens optical system Download PDFInfo
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- CN113204106B CN113204106B CN202110548073.4A CN202110548073A CN113204106B CN 113204106 B CN113204106 B CN 113204106B CN 202110548073 A CN202110548073 A CN 202110548073A CN 113204106 B CN113204106 B CN 113204106B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 27
- 230000000694 effects Effects 0.000 claims abstract description 8
- 239000011521 glass Substances 0.000 claims description 13
- 201000009310 astigmatism Diseases 0.000 claims description 3
- 238000012634 optical imaging Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 abstract description 10
- 230000004075 alteration Effects 0.000 abstract description 6
- 230000008859 change Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 238000003491 array Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/146—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having more than five groups
- G02B15/1461—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having more than five groups the first group being positive
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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
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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
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
- G02B13/146—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation with corrections for use in multiple wavelength bands, such as infrared and visible light, e.g. FLIR systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
Abstract
The invention relates to a wide-width high-resolution visible light lens optical system, which is sequentially provided with a first lens group with positive focal length, a second lens group with negative focal length, an iris diaphragm, a third lens group with positive focal length, a fourth lens group with positive focal length, a fifth lens group, a sixth lens group with negative focal length and a photosensitive image surface from an object side to an image side; the first lens group is used as a focusing group to move back and forth relative to the second lens group according to the distance of an object to realize the focusing effect, so that light from an object is focused on a photosensitive image surface again; the second lens group, the variable diaphragm, the third lens group, the fourth lens group, the fifth lens group and the sixth lens group are all fixed on the photosensitive image surface. The first lens of the second lens group and the first lens of the fourth lens group are aspheric lenses; in the scheme, the aspheric lens can correct aberration and reduce distortion, so that the optical system can obtain high image quality in wide-image-width imaging.
Description
Technical Field
The invention relates to the technical field of aerial remote sensing optical lenses, in particular to a wide-width high-resolution visible light lens optical system.
Background
At present, the transmission type lens is widely applied to the field of aerial remote sensing, the current market develops towards the direction of large image plane, high resolution and high image quality, in order to obtain aerial remote sensing images with large-range coverage and high resolution, the use of a photosensitive image plane with more pixel points, smaller pixels and larger target surface size is one of the fundamental ways for solving the problems, but the current aerial remote sensing lens has the following defects:
the common optical lens can not meet the requirement of 200mm of the image plane size required by aerial remote sensing, the lens with a large image plane in the current market, such as the lens with about 1' and the image plane size of 16.0mm, adopts a scheme of splicing a plurality of lenses for realizing wide imaging of aerial remote sensing, the volume and the weight of a system are uncontrollable, and the application development of the aerial remote sensing technology is seriously hindered;
the long-distance high-resolution imaging of aerial remote sensing requires that the focal length of a lens is larger than 300mm, and large-picture optical lenses in the market at present, such as lenses about 1', have short focal lengths and cannot meet the requirements.
At present, most of high-definition optical lenses on the market are 1080p, the number of pixels is 200 tens of thousands, however, for 36000 pixels of aerial remote sensing linear imaging and more than 12 hundred million pixels of area array imaging, the existing lenses on the market cannot meet the requirements.
The optical lens on the market at present only eliminates lens aberration in a visible spectrum range, and aerial remote sensing requires the optical lens to image in a wide spectrum range from visible light to near infrared to obtain a better low-illumination imaging effect, so that the optical system aberration needs to be eliminated in a wide visible near infrared spectrum range.
Disclosure of Invention
In view of the above, the present invention provides an optical system of a wide high-resolution visible light lens, which achieves the effect of eliminating aberration in a wide frame, a high resolution, a small volume and a visible near-infrared wide-band by using a long-focus optical lens with an image plane larger than 200mm and a focal length larger than 330mm, a large image plane, a high resolution and a low tolerance sensitivity.
In order to solve the technical problems, the invention adopts the technical scheme that: a wide-width high-resolution visible light lens optical system comprises an object side and an image side; the optical imaging system further comprises a first lens group with positive focal length, a second lens group with negative focal length, an iris diaphragm, a third lens group with positive focal length, a fourth lens group with positive focal length, a fifth lens group, a sixth lens group with negative focal length and a photosensitive image surface which are sequentially arranged between the object side and the image side;
the first lens group can move relative to the photosensitive image surface to serve as a focusing group and can move back and forth relative to the second lens group according to the distance of an object so as to realize the focusing effect, and therefore light rays from an object can be focused on the photosensitive image surface again;
the second lens group, the iris diaphragm, the third lens group, the fourth lens group, the fifth lens group and the sixth lens group are fixed relative to the photosensitive image surface.
Furthermore, the distance between the first lens group and the second lens group is 20.1mm, the distance between the second lens group and the third lens group is 2mm, the distance between the third lens group and the fourth lens group is 30.4mm, the distance between the fourth lens group and the fifth lens group is 101.4mm, the distance between the fifth lens group and the sixth lens group is 123mm, and the distance between the sixth lens group and the photosensitive image plane is 20 mm;
the focal length of the first lens group is positive and is used for eliminating astigmatism of an edge field, and the focal length range is 500-600 mm;
the sixth lens group is a negative single lens and is used for eliminating field curvature of the optical system, and the focal length range is-200 mm to-300 mm.
Further, the first lens group includes, in order from the object side to the image side, a first lens with a positive focal length and a second lens with a negative focal length; the refractive index of the first lens is less than 1.5, and the Abbe number is less than 50; the refractive index of the second lens is more than 1.7, and the Abbe number is more than 70; the first lens and the second lens form a double-separation lens with a negative focal length.
Further, the second lens group includes a third lens having a negative focal length and being a single lens, and further includes a fourth lens and a fifth lens cemented to each other; the refractive index of the third lens is more than 1.6, the Abbe number is more than 60, and the rear surface of the third lens is a quadratic aspheric surface; the fourth lens is a negative lens, the refractive index of the fourth lens is greater than 1.7, and the Abbe number of the fourth lens is less than 40; the fifth lens is a positive lens, the refractive index of the fifth lens is less than 1.5, and the Abbe number of the fifth lens is greater than 80.
Further, the third lens group includes a sixth lens and a seventh lens which are mutually cemented, the sixth lens is a negative lens, the front surface of the sixth lens is a quadratic aspheric surface, the refractive index of the sixth lens is greater than 1.6, and the abbe number is greater than 60; the seventh lens is a positive lens, the refractive index of the seventh lens is greater than 1.7, and the Abbe number of the seventh lens is less than 40.
Further, the fourth lens group comprises an eighth lens and a ninth lens which are mutually cemented, the focal length of the eighth lens from the object side to the image side is negative, the refractive index of the eighth lens is greater than 1.55, and the abbe number is greater than 65; the ninth lens is a single lens with a positive focal length, the refractive index of the ninth lens is greater than 1.7, and the Abbe number is less than 40; the fourth lens group further comprises a tenth lens with a positive focal length, the refractive index of the tenth lens is larger than 1.8, and the Abbe number is smaller than 30.
Furthermore, the sixth lens group comprises an eleventh lens which has a negative focal length and is a single lens, and the refractive index of the eleventh lens is greater than 1.6 and the abbe number of the eleventh lens is greater than 60.
Furthermore, the fifth lens group is a reflector, the distance between the reflector and the tenth lens is 90-110 mm, and the distance between the reflector and the eleventh lens is 120-130 mm.
Further, the third lens and the eighth lens are both aspheric lenses;
the surface shape of the aspherical lens satisfies the following relational expression:
in the formula, the parameter c is the curvature corresponding to the radius, r is a radial coordinate, the unit of the radial coordinate is the same as the unit of the length of the lens, and k is a conic coefficient.
Further, the caliber of the aspheric lens is less than or equal to 80 mm;
the aspheric surfaces of the aspheric lens are secondary aspheric surfaces and are glass aspheric lenses.
Compared with the prior art, the invention has the beneficial effects that: first, the zoom optical system of the present invention uses 11 lenses including 2 second aspheric glass lenses, and has high quality in a small number, a small volume, and a high lens transmittance.
Second, the head full field angle θ is 2 × tan (d/EFL), and the focal length EFL, d is half-image high. The imaging lens has a long focal length, the image height is not easy to design greatly, so the full field angle of the lens is small, for the lens with a focal length EFL of 330mm, the general field angle is about 1-2 degrees, the lens EFL of the invention is 330mm, d is 100mm, the designed full field angle is 32 degrees, and the wide picture image can be obtained under the limited space volume of the remote sensing camera by using the space remote sensing application.
Thirdly, the optical system of the invention uses the glass aspheric lens and does not use the plastic aspheric lens, so the temperature change has little influence on the performance of the lens, can be used in various environments, and is suitable for occasions with severe environmental temperature change, such as aviation airborne and vehicle-mounted situations.
Fourthly, the invention uses a piece of reflector to fold the light path of the lens, thereby reducing the length of the light path and reducing the volume of the lens.
Fifthly, the invention can realize ultrahigh resolution imaging with linear arrays higher than 36000 pixels and 1 hundred million pixels of an area array, and can achieve the effects that the central resolution is higher than 200lp/mm and the peripheral resolution of 0.7H (70 percent of diagonal position) is higher than 180 lp/mm.
Sixthly, the lens of the invention can eliminate aberration in a visible near-infrared full-spectrum band of 400 nm-850nm, and can simultaneously achieve clearness in a visible light wavelength band of 430nm-650nm and a near-infrared band of 650nm-850nm, so that the whole picture is clear under a wide-band condition.
Seventhly, the calibers of the glass aspheric lenses are smaller than 80mm, so that the processing difficulty is avoided, and the glass aspheric lenses are easy to popularize to the market.
The invention only uses two glass aspheric lenses, so that the sensitivity of the lens is reduced, the lens is easy to process, and the rate of finished products of lens assembly is greatly increased.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: 1. a first lens group; 2. a second lens group; 3. a third lens group; 4. a fourth lens group; 5. a fifth lens group; 6. a sixth lens group; 7. a photosensitive image surface; 8. an iris diaphragm; 101. a first lens; 102. a second lens; 201. a third lens; 202. a fourth lens; 203. a fifth lens; 301. a sixth lens; 302. a seventh lens; 401. an eighth lens; 402. a ninth lens; 403. a tenth lens; 101a, a front surface of the first lens; 101b, a rear surface of the first lens; 102a, a front surface of the second lens; 102b, a rear surface of the second lens; 201a, the front surface of the third lens; 201b, the rear surface of the third lens; 202a, the front surface of the fourth lens; 202b, the rear surface of the fourth lens; 203a, the front surface of the fifth lens; 203b, the rear surface of the fifth lens; 301a, the front surface of the sixth lens; 301b, the rear surface of the sixth lens; 302a, front surface of seventh lens; 302b, the rear surface of the seventh lens; 401a, the front surface of the eighth lens; 401b, the rear surface of the eighth lens; 402a, the front surface of the ninth lens; 402b, the rear surface of the ninth lens; 403a, the front surface of the tenth lens; 403b, the rear surface of the tenth lens; 6a, the front surface of the eleventh lens; 6b, the front surface of the eleventh lens.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in the figure, a wide-width high-resolution visible light lens optical system includes an object side and an image side; the zoom lens further comprises a first lens group 1 with a positive focal length, a second lens group 2 with a negative focal length, an iris diaphragm 8, a third lens group 3 with a positive focal length, a fourth lens group 4 with a positive focal length, a fifth lens group 5, a sixth lens group 6 with a negative focal length and a photosensitive image surface 7 which are sequentially arranged between the object side and the image side;
the first lens group 1 can move relative to the photosensitive image surface to serve as a focusing group, and can move back and forth relative to the second lens group 2 according to the distance between an object and the photosensitive image surface so as to realize a focusing effect, so that light rays from an object can be focused on the photosensitive image surface 7 again;
the second lens group 2, the iris diaphragm 8, the third lens group 3, the fourth lens group 4, the fifth lens group 5 and the sixth lens group 6 are all fixed relative to the photosensitive image plane 7.
The distance between the first lens group 1 and the second lens group 2 is 20.1mm, the distance between the second lens group 2 and the third lens group 3 is 2mm, the distance between the third lens group 3 and the fourth lens group 4 is 30.4mm, the distance between the fourth lens group 4 and the fifth lens group 5 is 101.4mm, the distance between the fifth lens group 5 and the sixth lens group 6 is 123mm, and the distance between the sixth lens group 6 and the photosensitive image plane 7 is 20 mm;
the focal length of the first lens group 1 is positive and is used for eliminating astigmatism of an edge field, and the focal length range is 500-600 mm;
the sixth lens group 6 is a negative single lens for eliminating field curvature of the optical system, and the focal length range is-200 mm to-300 mm.
The first lens group 1 includes, in order from an object side to an image side, a first lens 101 having a negative focal length and a second lens 102 having a positive focal length; the refractive index of the first lens 101 is less than 1.5, and the Abbe number is less than 50; the refractive index of the second lens 102 is more than 1.7, and the Abbe number is more than 70; the first lens 101 and the second lens 102 form a double-split lens with a positive focal length.
The second lens group 2 includes a third lens 201 which has a negative focal length and is a single lens, and further includes a fourth lens 202 and a fifth lens 203 which are cemented with each other; from the object side to the image side, the refractive index of the third lens 201 is greater than 1.6, the abbe number is greater than 60, and the rear surface 201b of the third lens 201 is a quadratic aspheric surface; the fourth lens 202 is a negative lens, the refractive index of the fourth lens 202 is greater than 1.7, and the abbe number is less than 40; the fifth lens 203 is a positive lens, and the refractive index of the fifth lens 203 is less than 1.5 and the abbe number is greater than 80.
The third lens group 3 includes a sixth lens 301 and a seventh lens 302 cemented with each other, the sixth lens 301 is a positive lens, a front surface 301a of the sixth lens 301 is a second order aspheric surface, a refractive index of the sixth lens is greater than 1.6, and an abbe number is greater than 60; the seventh lens 302 is a negative lens, and the refractive index of the seventh lens 302 is greater than 1.7 and the abbe number is less than 40.
The fourth lens group 4 includes an eighth lens 401 and a ninth lens 402 cemented with each other, a focal length of the eighth lens 401 from the object side to the image side is positive, a refractive index of the eighth lens 401 is greater than 1.55, and an abbe number is greater than 65; the ninth lens 402 is a single lens with a negative focal length, the refractive index of the ninth lens 402 is greater than 1.7, and the abbe number is less than 40; the fourth lens group 4 further includes a tenth lens 403 having a positive focal length, and the tenth lens 403 has a refractive index greater than 1.8 and an abbe number smaller than 30.
The sixth lens group 6 includes an eleventh lens which has a negative focal length and is a single lens, and the eleventh lens has a refractive index of greater than 1.6 and an abbe number of greater than 60.
The fifth group of lens group 5 is a reflector, the distance between the reflector 5 and the tenth lens 403 is 90-110 mm, and the distance between the reflector 5 and the eleventh lens is 120-130 mm.
The third lens 201 and the eighth lens 401 are both aspheric lenses;
the surface shape of the aspherical lens satisfies the following relational expression:
in the formula, the parameter c is the curvature corresponding to the radius, r is a radial coordinate, the unit of the radial coordinate is the same as the unit of the length of the lens, k is a conical conic coefficient, when the k coefficient is less than-1, the surface-shaped curve is a hyperbolic curve, when the k coefficient is equal to-1, the curve is a parabola, when the k coefficient is between-1 and 0, the curve is an ellipse, when the k coefficient is equal to 0, the curve is a circle, and when the k coefficient is greater than 0, the curve is an oblate.
The caliber of the aspheric lens is less than or equal to 80 mm;
the aspheric surfaces of the aspheric lens are secondary aspheric surfaces and are glass aspheric lenses.
Specifically, the zoom optical system of the present invention uses 11 lenses including 2 secondary aspherical glass lenses, and has high quality in a small number, a small volume, and a high lens transmittance.
The full field angle θ of the lens is 2 × tan (d/EFL), and the focal length EFL, d is half-image height. The imaging lens has a long focal length, the image height is not easy to design greatly, so the full field angle of the lens is small, for the lens with a focal length EFL of 330mm, the general field angle is about 1-2 degrees, the lens EFL of the invention is 330mm, d is 100mm, the designed full field angle is 32 degrees, and the wide picture image can be obtained under the limited space volume of the remote sensing camera by using the space remote sensing application.
The optical system of the invention uses the glass aspheric lens and does not use the plastic aspheric lens, so the temperature change has little influence on the performance of the lens, and the optical system can be used in various environments and is suitable for occasions with severe environmental temperature change, such as aviation airborne and vehicle-mounted occasions.
The invention uses a piece of reflector to fold the light path of the lens, thus reducing the length of the light path and reducing the volume of the lens.
The invention can realize ultrahigh resolution imaging with linear arrays higher than 36000 pixels and area array 1 hundred million pixels, and can achieve the effects that the central resolution is higher than 100lp/mm and the peripheral 0.7H (70% diagonal position) resolution is higher than 80 lp/mm.
The lens of the invention can eliminate aberration in the visible near-infrared full-spectrum band of 400 nm-850nm, and can simultaneously achieve the purpose of being clear in the visible light wavelength band of 430nm-650nm and the near-infrared band of 650nm-850nm, thereby ensuring that the whole picture is clear under the condition of wide wavelength band.
The calibers of the glass aspheric lenses are all smaller than 80mm, so that the processing difficulty is avoided, and the glass aspheric lenses are easy to popularize to the market.
The invention only uses two glass aspheric lenses, so that the sensitivity of the lens is reduced, the lens is easy to process, and the rate of finished products of lens assembly is greatly increased.
As shown in table 1, for a practical design case of the present invention:
the front surface 101a of the first lens is a spherical surface, the rear surface 101b of the first lens is a spherical surface, the front surface 102a of the second lens is a spherical surface, the rear surface 102b of the second lens is a spherical surface, the front surface 201a of the third lens is a spherical surface, the rear surface 201b of the third lens is an aspherical surface, the front surface 202a of the fourth lens is a spherical surface, the rear surface 202b of the fourth lens is a spherical surface, the front surface 203a of the fifth lens is a spherical surface, the rear surface 203b of the fifth lens is a spherical surface, the front surface 301a of the sixth lens is an aspherical surface, the rear surface 301b of the sixth lens is a spherical surface, the front surface 302a of the seventh lens is a spherical surface, the rear surface 302b of the seventh lens is a spherical surface, the front surface 401a of the eighth lens is a spherical surface, and the rear surface 401b of the eighth lens is a spherical surface, the front surface 402a of the ninth lens is a spherical surface, the rear surface 402b of the ninth lens is a spherical surface, the front surface 403a of the tenth lens is a spherical surface, the rear surface 403b of the tenth lens is a spherical surface, the front surface 6a of the eleventh lens is a spherical surface, and the front surface 6b of the eleventh lens is a spherical surface.
Table 1.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (3)
1. A wide-width high-resolution visible light lens optical system is characterized in that: comprising an object side and an image side; the optical imaging system further comprises a first lens group with positive focal length, a second lens group with negative focal length, an iris diaphragm, a third lens group with positive focal length, a fourth lens group with positive focal length, a fifth lens group, a sixth lens group with negative focal length and a photosensitive image surface which are sequentially arranged between the object side and the image side;
the first lens group can move relative to the photosensitive image surface to serve as a focusing group and can move back and forth relative to the second lens group according to the distance of an object so as to realize the focusing effect, and therefore light rays from an object can be focused on the photosensitive image surface again;
the second lens group, the iris diaphragm, the third lens group, the fourth lens group, the fifth lens group and the sixth lens group are fixed relative to the photosensitive image surface;
the distance between the first lens group and the second lens group is 20.1mm, the distance between the second lens group and the third lens group is 2mm, the distance between the third lens group and the fourth lens group is 30.4mm, the distance between the fourth lens group and the fifth lens group is 101.4mm, the distance between the fifth lens group and the sixth lens group is 123mm, and the distance between the sixth lens group and the photosensitive image plane is 20 mm;
the focal length of the first lens group is positive and is used for eliminating astigmatism of an edge field, and the focal length range is 500-600 mm;
the sixth lens group is a negative single lens and is used for eliminating field curvature of the optical system, and the focal length range is-200 mm to-300 mm;
the first lens group comprises a first lens with a positive focal length and a second lens with a negative focal length in sequence from the object side to the image side; the refractive index of the first lens is less than 1.5, and the Abbe number is less than 50; the refractive index of the second lens is more than 1.7, and the Abbe number is more than 70; the first lens and the second lens form a double-separation lens with positive focal length;
the second lens group comprises a third lens with a negative focal length and a single lens, and further comprises a fourth lens and a fifth lens which are mutually glued; the refractive index of the third lens is more than 1.6, the Abbe number is more than 60, and the rear surface of the third lens is a quadratic aspheric surface; the fourth lens is a negative lens, the refractive index of the fourth lens is greater than 1.7, and the Abbe number of the fourth lens is less than 40; the fifth lens is a positive lens, the refractive index of the fifth lens is less than 1.5, and the Abbe number is greater than 80;
the third lens group comprises a sixth lens and a seventh lens which are mutually cemented, the sixth lens is a positive lens, the front surface of the sixth lens is a quadratic aspheric surface, the refractive index of the sixth lens is more than 1.6, and the Abbe number is more than 60; the seventh lens is a negative lens, the refractive index of the seventh lens is greater than 1.7, and the Abbe number of the seventh lens is less than 40;
the fourth lens group comprises an eighth lens and a ninth lens which are mutually cemented, the focal length of the eighth lens from the object side to the image side is positive, the refractive index of the eighth lens is more than 1.55, and the Abbe number is more than 65; the ninth lens is a single lens with a negative focal length, the refractive index of the ninth lens is greater than 1.7, and the Abbe number is less than 40; the fourth lens group further comprises a tenth lens with a positive focal length, the refractive index of the tenth lens is greater than 1.8, and the Abbe number is smaller than 30;
the sixth lens group comprises an eleventh lens which has a negative focal length and is a single lens, and the refractive index of the eleventh lens is greater than 1.6 and the Abbe number is greater than 60;
the fifth lens group is a reflector, the distance between the reflector and the tenth lens is 90-110 mm, and the distance between the reflector and the eleventh lens is 120-130 mm.
2. The wide-width high-resolution visible light lens optical system according to claim 1, wherein: the third lens and the eighth lens are both aspheric lenses;
the surface shape of the aspherical lens satisfies the following relational expression:
in the formula, the parameter c is the curvature corresponding to the radius, r is a radial coordinate, the unit of the radial coordinate is the same as the unit of the length of the lens, and k is a conic coefficient.
3. The wide-format high-resolution visible light lens optical system according to claim 2, wherein: the caliber of the aspheric lens is less than or equal to 80 mm;
the aspheric surfaces of the aspheric lens are secondary aspheric surfaces and are glass aspheric lenses.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09113807A (en) * | 1995-10-20 | 1997-05-02 | Konica Corp | Zoom lens for finite distance |
| JP5517546B2 (en) * | 2009-10-05 | 2014-06-11 | キヤノン株式会社 | Optical system and optical apparatus having the same |
| CN103930814B (en) * | 2011-11-14 | 2016-06-29 | 富士胶片株式会社 | Middle-range long shot and camera head |
| CN108681051A (en) * | 2018-05-23 | 2018-10-19 | 中山联合光电科技股份有限公司 | High-resolution, big multiplying power, the infrared confocal varifocal optical system in short focus end |
| CN109581638A (en) * | 2019-01-23 | 2019-04-05 | 中山联合光电科技股份有限公司 | A kind of high-resolution, small distortion, small size, big image planes varifocal optical system |
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2021
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