CN117666095B - Large-view-field short-focus ultra-short-distance ultra-high definition imaging system and lens - Google Patents
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Abstract
The application provides a large-view-field short-focus ultra-short-distance ultra-high definition imaging system and a lens, and relates to the field of optical imaging; the 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 front to back along an optical axis; the object side surface of the first lens is a convex aspheric surface, and the image side surface of the first lens is a concave aspheric surface; the second lens is a biconcave biconvex surface; the object side surface of the third lens is a convex spherical surface, and the image side surface of the third lens is a convex spherical surface; the fourth lens is a biconcave biconvex surface; the fifth lens is a biconvex spherical surface; the object side surface of the sixth lens is a concave aspheric surface, and the image side surface of the sixth lens is a convex aspheric surface; the object side surface of the seventh lens is a concave spherical surface, and the image side surface of the seventh lens is a convex spherical surface. The imaging system has high resolution, good imaging quality and low cost, can overcome the DLP imaging with high cost, and can select LCD liquid crystal screen imaging with various sizes to replace DLP imaging.
Description
Technical Field
The invention relates to the field of optical imaging, in particular to a large-view-field short-focus ultra-short-distance ultra-high-definition imaging system and a lens.
Background
With the continuous development of projection technology, the demands of people for high-definition and ultra-short distance imaging are increasing, and the ultra-short distance imaging technology enables users to obtain large-size high-quality images at extremely close projection distances, so that attractive and convenient solutions are provided for the fields of industry, business, education, vehicle-mounted and the like.
However, the challenge of implementing ultra-short imaging is the design of the optical system and the limitations of the lens technology, and conventional projection lenses generally require a long projection distance, whereas ultra-short imaging requires large-sized imaging within a relatively short distance, which is difficult to meet. Among them, digital light processing projection Devices (DLPs) have been increasingly mainstream projection devices by virtue of their high definition pictures, high brightness images, rich colors, and high contrast display.
The existing vehicle-mounted imaging lens, particularly the HUD head-up display, adopts a DLP imaging system, but DLP imaging is a technology for completing visual digital information display based on a digital micro-mirror element-DMD (Digital Micromirror Device), has high cost, is only a few tenths of an inch, and is small-field short-distance long-focus imaging; in order to realize the vehicle-mounted large-view-field short-distance short-focus imaging picture, a projection lens with higher performance is required to be matched, which leads to the increase of the number of lenses and the increase of manufacturing cost.
Disclosure of Invention
The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a large field of view short focal length ultra-short range ultra-high definition imaging system and lens which overcomes or at least partially solves the above-mentioned problems.
In order to solve the problems, the invention discloses a large-view-field short-focus ultra-short-distance ultra-high definition imaging system, which 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 front to back along an optical axis;
the object side surface of the first lens is a convex aspheric surface, and the image side surface of the first lens is a concave aspheric surface;
the second lens is a biconcave biconvex surface;
the object side surface of the third lens is a convex spherical surface, and the image side surface of the third lens is a convex spherical surface;
the fourth lens is a biconcave biconvex surface;
the fifth lens is a biconvex spherical surface;
the object side surface of the sixth lens is a concave aspheric surface, and the image side surface of the sixth lens is a concave aspheric surface;
the object side surface of the seventh lens is a concave spherical surface, and the image side surface of the seventh lens is a convex spherical surface.
Preferably, a diaphragm is arranged between the third lens and the fourth lens.
Preferably, the aspherical surfaces of the first lens, the second lens, and the sixth lens satisfy an aspherical equation:
；
where z is the surface sagittal height, y is the radial radius, R is the curvature, k is the conic coefficient, and A, B, C, D, E, F, G, H, J is the aspheric coefficient.
Preferably, the spherical surface is made of glass material, and the aspheric surface is made of acrylic material.
Preferably, the first lens, the second lens and the sixth lens are made of acrylic material with the model of 'P-CARBO';
the third lens and the fifth lens are made of glass materials with the model of HLAF 3B-CDGM;
the fourth lens is made of glass materials with the model of HZF 3-CDGM;
the seventh lens is made of glass materials with the model of HZK 9B-CDGM.
Preferably, a distance between the first lens and the second lens is 15.79mm, a distance between the second lens and the third lens is 13.2mm, a distance between the third lens and the fourth lens is 9.51mm, the fourth lens, the fifth lens and the sixth lens are glued to each other, and a distance between the sixth lens and the seventh lens is 61.02mm.
Preferably, the distance between the seventh lens and the image plane is 39.1576mm.
The large-view-field short-focus ultra-short-distance ultra-high definition imaging lens comprises the imaging system, and the length TL of the imaging lens and the focal length F of the imaging lens satisfy the following conditions: TL/F is less than or equal to 5.06.
Preferably, the optical back focal length BFL of the imaging lens and the length TL of the imaging lens satisfy: BFL/TL is greater than or equal to 0.015.
The application specifically comprises the following advantages:
in the embodiments of the present application, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are disposed in this order from front to back along the optical axis; the object side surface of the first lens is a convex aspheric surface, and the image side surface of the first lens is a concave aspheric surface; the second lens is a biconcave biconvex surface; the object side surface of the third lens is a convex spherical surface, and the image side surface of the third lens is a convex spherical surface; the fourth lens is a biconcave biconvex surface; the fifth lens is a biconvex spherical surface; the object side surface of the sixth lens is a concave aspheric surface, and the image side surface of the sixth lens is a concave aspheric surface; the object side surface of the seventh lens is a concave spherical surface, and the image side surface of the seventh lens is a convex spherical surface. By adopting a mixed and crossed design of seven spherical lenses and aspheric lenses, positive and negative condensation are mutually counteracted, so that temperature drift is reduced, aberration is improved, and field curvature and distortion can be corrected by aspheric surface alternate arrangement; the spherical lens is made of optical glass, and the aspherical lens is made of acrylic material, so that the manufacturing cost can be reduced; the curvature radius, the material and the distance between the lenses are adjusted, so that the concentration degree of the transfer function is improved, the dispersity is reduced, the resolution and the contrast of the lens are optimized, the distance between the lens and the image surface is adjusted to enable the lens to be close to a liquid crystal screen, the purpose of improving the contrast is to improve the uniformity of brightness, and finally, the large-view-field short-focus ultra-short-distance high-definition imaging is realized. The imaging system and the imaging lens have high resolution, good imaging quality and low cost, can overcome DLP imaging with high cost, can select LCD liquid crystal display imaging with various sizes to replace DLP imaging, and improve practicality.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the description of the present application will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a large field of view short focal length ultra-short range ultra-high definition imaging system and optical path of the present invention;
FIG. 2 is a schematic representation of the transfer function of the imaging system of the present invention;
FIG. 3 is a field curvature and distortion map of an imaging system of the present invention;
FIG. 4 is a point column diagram of an imaging system of the present invention;
fig. 5 is a schematic structural diagram of a large-view-field short-focus ultra-short-distance ultra-high definition imaging lens.
Reference numerals illustrate:
11. a first lens; 12. a second lens; 13. a third lens; 14. a fourth lens; 15. a fifth lens; 16. a sixth lens; 17. and a seventh lens.
Detailed Description
In order to make the objects, features and advantages of the present application more comprehensible, the present application is described in further detail below with reference to the accompanying drawings and detailed description. It will be apparent that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
Referring to fig. 1 to fig. 5, a schematic structural diagram of a large-field-of-view short-focus ultra-short-distance ultra-high definition imaging system according to the present invention is shown, which may specifically include the following structures: a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, and a seventh lens 17, which are disposed in this order from front to back along the optical axis;
the object side surface of the first lens 11 is a convex aspheric surface, and the image side surface of the first lens 11 is a concave aspheric surface;
the second lens 12 is a biconcave biconvex surface;
the object side surface of the third lens element 13 is a convex spherical surface, and the image side surface of the third lens element 13 is a convex spherical surface;
the fourth lens 14 is a biconcave biconvex surface;
the fifth lens 15 is a biconvex bicospherical surface;
the object side surface of the sixth lens element 16 is a concave aspheric surface, and the image side surface of the sixth lens element 16 is a concave aspheric surface;
the object side surface of the seventh lens element 17 is a concave spherical surface, and the image side surface of the seventh lens element 17 is a convex spherical surface.
In the embodiment of the present application, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16, and the seventh lens 17 are disposed in this order from front to back along the optical axis; the object side surface of the first lens 11 is a convex aspheric surface, and the image side surface of the first lens 11 is a concave aspheric surface; the second lens 12 is a biconcave biconvex surface; the object side surface of the third lens element 13 is a convex spherical surface, and the image side surface of the third lens element 13 is a convex spherical surface; the fourth lens 14 is a biconcave biconvex surface; the fifth lens 15 is a biconvex bicospherical surface; the object side surface of the sixth lens element 16 is a concave aspheric surface, and the image side surface of the sixth lens element 16 is a concave aspheric surface; the object side surface of the seventh lens element 17 is a concave spherical surface, and the image side surface of the seventh lens element 17 is a convex spherical surface. By adopting a mixed and crossed design of seven spherical lenses and aspheric lenses, positive and negative condensation are mutually counteracted, so that temperature drift is reduced, aberration is improved, and field curvature and distortion can be corrected by aspheric surface alternate arrangement; the spherical lens is made of optical glass, and the aspherical lens is made of acrylic material, so that the manufacturing cost can be reduced; the curvature radius, the material and the distance between the lenses are adjusted, so that the concentration degree of the transfer function is improved, the dispersity is reduced, the resolution and the contrast of the lens are optimized, the distance between the lens and the image surface is adjusted to enable the lens to be close to a liquid crystal screen, the purpose of improving the contrast is to improve the uniformity of brightness, and finally, the large-view-field short-focus ultra-short-distance high-definition imaging is realized. The imaging system and the imaging lens have high resolution, good imaging quality and low cost, can overcome DLP imaging with high cost, can select LCD liquid crystal display imaging with various sizes to replace DLP imaging, and improve practicality.
Next, a large-field short-focus ultra-short-range ultra-high definition imaging system in the present exemplary embodiment will be further described.
In the embodiment of the application, the large-view-field short-focus ultra-short-distance ultra-high definition imaging system comprises seven lenses, namely a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16 and a seventh lens 17 which are sequentially arranged from front to back along an optical axis; the object side surface of the first lens 11 is a convex aspheric surface, the image side surface of the first lens 11 is a concave aspheric surface, the first lens 11 receives incident light rays and plays roles in focusing and guiding the light rays, and the first lens 11 with the aspheric surface can effectively correct primary spherical aberration, distortion and the like;
the second lens 12 is a biconcave double aspheric surface, is a negative focal power lens, has a radius of curvature of the front surface smaller than 0, and has a radius of curvature of the rear surface larger than 0, and is used for eliminating spherical aberration, coma aberration and astigmatism;
the object side surface of the third lens 13 is a convex spherical surface, the image side surface of the third lens 13 is a convex spherical surface, and is a positive focal power lens, the curvature radius of the front surface is larger than 0, and the curvature radius of the rear surface is smaller than 0, so as to eliminate spherical aberration and coma;
the fourth lens element 14, the fifth lens element 15 and the sixth lens element 16 are cemented lens elements to compensate each other for chromatic aberration thereof, so as to greatly correct spherical aberration and axial chromatic aberration, wherein the fourth lens element 14 is a biconcave hyperboloid, the fifth lens element 15 is a biconcave hyperboloid, the object side surface of the sixth lens element 16 is a concave aspheric surface, and the image side surface of the sixth lens element 16 is a concave aspheric surface, so as to correct curvature of field and distortion during light emission, and eliminate aberration and astigmatism;
the object side surface of the seventh lens element 17 is a concave spherical surface, the image side surface of the seventh lens element 17 is a convex spherical surface, the seventh lens element 17 is disposed close to the image surface, and is only 39.1576mm away from the LCD panel, so that the contrast ratio and the brightness uniformity of the lens assembly can be improved.
In this embodiment, the optical parameters of each lens of the imaging system are shown in the following table:
table one:
the order of the surface numbers corresponds to the order of the mirror surfaces of the first lens 11 to the seventh lens 17.
The spherical surface is made of glass, the aspheric surface is made of acrylic, and specifically, the first lens 11, the second lens 12 and the sixth lens 16 are made of acrylic with the model of 'P-CARBO'; the third lens 13 and the fifth lens 15 are made of glass materials with the model of HLAF3B-CDGM, and HLAF3B is high-refractive-index glass with high light transmittance and low dispersion, can focus light rays, reduce chromatic aberration and improve imaging definition and accuracy; the fourth lens 14 is made of glass material with the model of HZF3-CDGM, and the HZF3 is low-dispersion glass with good dispersion correction performance, can reduce chromatic aberration and aberration, and improves imaging resolution and color accuracy; the seventh lens 17 is made of glass material with the model of HZK9B-CDGM, and the HZK9B is low-refractive-index low-dispersion glass, so that the scattering and reflection loss of transmitted light can be reduced, the energy transmission efficiency can be improved, and the aberration in an optical system can be reduced. The aspheric lens is made of acrylic materials, the materials are easy to obtain, the product cost can be greatly reduced, and the imaging quality can be improved by adopting the spherical lens made of glass materials with good optical performance.
As an example, the interval between the first lens 11 and the second lens 12 is 15.79mm, the interval between the second lens 12 and the third lens 13 is 13.2mm, the interval between the third lens 13 and the fourth lens 14 is 9.51mm, the fourth lens 14, the fifth lens 15 and the sixth lens 16 are glued to each other, the interval between the sixth lens 16 and the seventh lens 17 is 61.02mm, and the distance between the seventh lens 17 and the image plane is 39.1576mm.
The spherical aberration, the coma aberration, the astigmatism and the chromatic aberration of the imaging system are balanced by adjusting the parameters such as the materials, the curvature radius, the spacing between the lenses and the like of the seven lenses, so that the concentration of a transfer function is improved, and the dispersivity is reduced.
As an example, a diaphragm is provided between the third lens 13 and the fourth lens 14 for controlling the depth of field, the range of the imaging object space, and the brightness of the image.
As an example, the aspherical surfaces of the first lens 11, the second lens 12, and the sixth lens 16 satisfy the aspherical equation:
；
where z is the surface sagittal height, y is the radial radius, R is the curvature, k is the conic coefficient, and A, B, C, D, E, F, G, H, J is the aspheric coefficient.
The higher order coefficients of each aspherical lens are shown in table two below:
and (II) table:
the surface number in table two corresponds to the surface number in table one.
The transfer function curve of this embodiment is shown in fig. 2.
The Diffraction MTF (Modulation Transfer Function) refers to a Diffraction modulation transfer function, representing the integrated resolving power of the optical system, and the horizontal axis in the figure represents spatial frequency (Spatial Frequency), in units of: turns per millimeter (cycles/mm). The vertical axis represents the value "Modulation" of the Modulation Transfer Function (MTF), the value of MTF is used to evaluate the imaging quality of the lens, the range of the value is 0-1, the higher the MTF curve is, the straighter the imaging quality of the lens is, the stronger the reduction capability on the real image is, the better the curve coincidence degree of each view field is, and the better the consistency of the image quality is. From the figure, it can be seen that the MTF of the full field of view is greater than 0.2 and the concentration is better when the spatial frequency of the visible light wave band is 32, which proves that the resolution of the lens is higher and the edge and the middle are clear at the same time.
As shown in the left diagram of fig. 3, the field curvature chart (ASTIGMATICFIELD CURVES) of the present embodiment shows the FOCUS Offset (FOCUS), in units of: millimeter (MILLIMETERS); the vertical axis represents image height (IMG HT). The S curve represents the sagittal field curvature, the T curve represents the meridional field curvature, three light rays with the wavelengths of 656.27nm, 587.56nm and 486.13nm pass through the optical imaging system, the focal offset of the sagittal field curvature and the meridional field curvature is in the range of-0.7 mm to 0.7mm, the field curvature of the optical imaging system is smaller, the field curvature and the astigmatism of each field (especially the edge field) are well corrected, and the center and the edge of the field have clear imaging.
The DISTORTION map (DISTORTION) of this embodiment is shown in the right-hand diagram of fig. 3. In the figure, the horizontal axis represents DISTORTION ratio (DISTORTION), units: percentage; the vertical axis represents image height (IMG HT). As can be seen from the distortion chart, three light rays with the wavelengths of 656.27nm, 587.56nm and 486.13nm pass through the optical imaging system, the distortion rate is in the range of-0.02%, the image deformation caused by the main light beam is small, and the imaging quality of the optical imaging system is excellent.
The point diagram of this embodiment is shown in fig. 4. The distance from the center of the imaging system to the edge (FIELD POSITION) is shown on the left side, the RMS on the right side represents the radius of the square root, and the horizontal axis represents Defocus (DEFOCUSING), so that the size of a diffuse spot formed after light rays with different wavelengths are imaged on an image plane can be reflected; it can be seen from the figure that the diffuse spots are more and more dispersed from the center to the edge, representing the imaging more and more difference from the middle to the edge, and it can also be seen from the figure that the spherical difference is obvious when the spherical difference is 40mm away from the center, the coma difference is generated when the spherical difference is 56mm away from the center, and the aberration is generated subsequently. The focusing degree of the spot light spots at the center and the edge of the imaging system is good, the center and the edge are clear, and particularly, no spherical aberration, coma aberration and the like exist within 40mm from the center, so that the imaging quality is excellent.
As shown in fig. 5, the embodiment of the present application further provides a large-field-of-view short-focal-length ultra-short-distance ultra-high definition imaging lens, including the above imaging system, where the length TL of the imaging lens and the focal length F of the imaging lens satisfy: TL/F is less than or equal to 5.06; the optical back focal length BFL of the imaging lens and the length TL of the imaging lens satisfy: BFL/TL is greater than or equal to 0.015.
In one embodiment, specific optical parameters of the imaging lens are shown in the following table three:
table three:
the embodiment adopts a seven-piece lens structure, realizes that the focal length EFL is about 65mm, the angle of view ANG can reach 34.3956 degrees, the practical use F Number (FNO) can reach 3.9, the lens length TTL can realize 329.0278mm, and the imaging size is high in selectivity and low in cost, and can be applied to a vehicle-mounted camera and can be installed in a small area of an instrument desk by adopting 4 inch, 5 inch or 6 inch liquid crystal display to image instead of DLP imaging of a few tenths of an inch.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or terminal device comprising the element.
The invention provides a large-view-field short-focus ultra-short-distance ultra-high definition imaging system and a lens, which are described in detail, wherein specific examples are applied to illustrate the principle and the implementation of the invention, and the description of the above examples is only used for helping to understand the method and the core idea of the invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (3)
1. The large-view-field short-focus ultra-short-distance ultra-high definition imaging system is characterized by comprising 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 plane to an image plane along an optical axis, wherein the number of the lenses with refractive power in the imaging system is seven;
the object side surface of the first lens is a convex aspheric surface, the image side surface of the first lens is a concave aspheric surface, and the focal length of the first lens is-470 mm;
the object side surface of the second lens is a concave aspheric surface, the image side surface of the second lens is a concave aspheric surface, and the focal length of the second lens is-140 mm;
the object side surface of the third lens is a convex spherical surface, the image side surface of the third lens is a convex spherical surface, and the focal length of the third lens is 57mm;
the object side surface of the fourth lens is a concave spherical surface, the image side surface of the fourth lens is a concave spherical surface, and the focal length of the fourth lens is-50 mm;
the object side surface of the fifth lens is a convex spherical surface, the image side surface of the fifth lens is a convex spherical surface, and the focal length of the fifth lens is 35mm;
the object side surface of the sixth lens is a concave aspheric surface, the image side surface of the sixth lens is a concave aspheric surface, and the focal length of the sixth lens is-179 mm;
the object side surface of the seventh lens is a concave spherical surface, the image side surface of the seventh lens is a convex spherical surface, and the focal length of the seventh lens is-108 mm;
the first lens, the second lens and the sixth lens are all made of materials with the model of P-CARBO;
the third lens and the fifth lens are made of glass materials with the model of HLAF 3B-CDGM;
the fourth lens is made of glass materials with the model of HZF 3-CDGM;
the seventh lens is made of glass materials with the model of HZK 9B-CDGM;
a pitch between the first lens and the second lens is 15.7927mm, a pitch between the second lens and the third lens is 13.199mm, a pitch between the third lens and the fourth lens is 9.5056mm, a pitch between the fourth lens and the fifth lens is 0.0002mm, a pitch between the sixth lens and the seventh lens is 61.0161mm, and a distance from an image side surface of the seventh lens to the image surface is 39.1576mm;
the focal length of the imaging system is 65mm.
2. The large field of view short focus ultrashort range ultra high definition imaging system of claim 1, wherein a stop is disposed between the third lens and the fourth lens.
3. A large field of view short focus ultra short range ultra high definition imaging lens comprising an imaging system according to any of claims 1-2, wherein the object plane to the image plane distance is 329.0278mm.
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| CN108873273A (en) * | 2015-01-30 | 2018-11-23 | 大立光电股份有限公司 | Optical image taking system and image-taking device |
| CN112346205A (en) * | 2019-08-07 | 2021-02-09 | 江西晶超光学有限公司 | Optical system, lens module and electronic equipment |
| JP6903850B1 (en) * | 2020-03-27 | 2021-07-14 | エスゼット ディージェイアイ テクノロジー カンパニー リミテッドＳｚ Ｄｊｉ Ｔｅｃｈｎｏｌｏｇｙ Ｃｏ．，Ｌｔｄ | Lens system, image pickup device, and moving object |
| CN113741000A (en) * | 2020-05-29 | 2021-12-03 | 大立光电股份有限公司 | Image capturing lens assembly, image capturing device and electronic device |
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