CN113391432A - Large-aperture three-piece optical lens - Google Patents
Large-aperture three-piece optical lens Download PDFInfo
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- CN113391432A CN113391432A CN202110612985.3A CN202110612985A CN113391432A CN 113391432 A CN113391432 A CN 113391432A CN 202110612985 A CN202110612985 A CN 202110612985A CN 113391432 A CN113391432 A CN 113391432A
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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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Abstract
The invention provides a large-aperture three-piece optical lens, which comprises a first lens with positive focal power, a second lens with negative focal power and a third lens with positive focal power, wherein an S1 surface, an S2 surface, an S3 surface, an S4 surface, an S5 surface and an S6 surface are sequentially arranged, one side of the S6 surface is provided with an S7 surface, an aperture diaphragm is arranged outside the S1 surface or between the S2 surface and the S3 surface, and an vignetting diaphragm is arranged outside the S6 surface; the distance between the aperture stop and the object focus of the lens is | ST-FobjL, the equivalent focal length of the lens is f0，|ST‑Fobj|<0.8f0(ii) a The diameters from the surface S1 to the surface S6 satisfy di>0.9dj；|R4|<|R3|，|R5|<|R6I, the equivalent focal length of the first lens is f1The equivalent focal length of the third lens is f3，|f1‑f3|<0.5*f1；G45>G23. The invention has simple and stable integral structure and assembly toleranceThe rate is high, and the light distribution brightness can be greatly improved.
Description
Technical Field
The invention relates to an optical lens, and particularly discloses a large-aperture three-piece optical lens.
Background
In the conventional technology, a headlight lens using a projection principle is formed by combining a light source, a light energy collecting element, a bright-dark cut-off line structure and a convex lens.
The pixel headlight that newly develops now, also known as the matrix headlight has used light digital projection technique for car headlight not only has the illumination function, can also be at ground projection pattern, like weather condition, road navigation, or other symbols that supply personnel's discernment outside the car. The optical system of the pixel headlight mainly comprises a pixel (such as a mini LED, a micro LED, an LCD liquid crystal screen, an LCOS or a lighted DMD digital micromirror) capable of emitting light and a projection optical lens. In order for the projected pattern to be clearly visible, the lens needs to achieve good optical performance: eliminating various optical aberrations such as chromatic aberration, field curvature, astigmatism and the like.
The optical lens in the prior art needs to combine a plurality of positive and negative lenses properly for use, thereby eliminating aberration. The number of the optical lenses used is related to the parameters and performance indexes of the optical lens, the used optical materials and the optical process, the number of the lenses of the slightly complicated optical lens can reach more than 10, the number of the lenses in the optical lens used for the mobile phone at present is more than 6, and the cost is high.
The Cuk three-piece lens system, as shown in FIG. 1, can correct various aberrations well, and can have better imaging quality, but the numerical aperture of the original design is smaller, generally not more than 0.2, which means that the light energy utilization rate is low, and the lens needs to be adjusted very accurately when being assembled and used, and has small tolerance rate and high use requirement.
The pixel headlight has the function of illumination and formation of image concurrently, needs higher energy utilization on the one hand, and the luminance that needs is higher, and on the other hand projected formation of image has certain image quality requirement, especially needs low colour difference. In addition, due to the particularity of automotive applications, the optical lens is required to have higher thermal reliability, better vibration reliability and lighter weight, so as to further improve market competitiveness and simultaneously require lower cost.
The optical lens in the prior art cannot meet the performance requirements of high energy utilization rate, high imaging quality, simple and stable structure and low cost at the same time.
Disclosure of Invention
Therefore, it is necessary to provide a large-aperture three-piece optical lens with high energy utilization rate, high imaging quality, simple and stable structure, and low manufacturing and use cost, which aims at the problems of the prior art.
In order to solve the prior art problem, the invention discloses a large-aperture three-piece optical lens, which comprises a first lens with positive focal power, a second lens with negative focal power and a third lens with positive focal power, wherein the first lens, the second lens and the third lens are sequentially arranged, the two surfaces of the first lens are respectively an S1 surface and an S2 surface, the two surfaces of the second lens are respectively an S3 surface and an S4 surface, the two surfaces of the third lens are respectively an S5 surface and an S6 surface, the S1 surface, the S2 surface, the S3 surface, the S4 surface, the S5 surface and the S6 surface are sequentially arranged, one side, away from the S5 surface, of the S6 surface is provided with an S7 surface, the S1 surface or an aperture stop is arranged between the S2 surface and the S3 surface, the S6 surface is provided with an vignetting diaphragm, the S1 surface, the S2 surface and the S5 surface are both concave surfaces, and the S4 surface is a concave surface;
the distance between the aperture stop and the object focus of the lens is | ST-FobjL, the equivalent focal length of the lens is f0，|ST-Fobj|＜0.8f0；
Caliber d from surface S1 to surface S61～d6The following relationship is satisfied: di＞0.9djJ is less than i, i is an integer of 1-5, and j is an integer of 2-6;
radius of curvature of the S3 face is R3Radius of curvature R of S4 plane4，|R4|＜|R3The radius of curvature of the S5 surface is R5And the radius of curvature of the S6 surface is R6，|R5|＜|R6I, the equivalent focal length of the first lens is f1The equivalent focal length of the third lens is f3，|f1-f3|＜0.5*f1；
The center-to-center distance between the S4 plane and the S5 plane is G45The distance between the centers of the S2 plane and the S3 plane is G23，G45＞G23。
Further, the distance between the S6 surface and the S7 surface is more than 2 mm.
Further, the surface of S3 is convex.
Further, the surface of S6 is a plane or a convex surface.
Further, the S1, S2, S3, S4, S5 and S6 surfaces are spherical or aspherical surfaces.
Further, the first lens, the second lens and the third lens are single lenses or cemented lenses.
Furthermore, the first lens, the second lens and the third lens are glass lenses or plastic lenses.
Furthermore, the Abbe number of the first lens is Vd1The Abbe number of the second lens is Vd2The abbe number of the third lens is Vd3，Vd1-Vd2＞25，Vd3-Vd2＞25。
The invention has the beneficial effects that: the invention discloses a large-aperture three-piece optical lens, which has the advantages that only three lenses are used in the overall structure, the manufacturing cost of the optical lens is low, the overall structure is simple and stable, the vibration resistance is good, the lens quality is light, the sensitivity of each lens to axial tolerance during assembly is low, the tolerance rate is high, the assembly difficulty is low, and the assembly cost is low; before the optical lens has enough color performance and imaging quality, the energy utilization rate is improved by increasing the numerical aperture, the light distribution brightness can be greatly improved, and the application of a projection imaging system is particularly facilitated.
Drawings
Fig. 1 is a schematic structural diagram of a cuckoo three-piece lens system.
Fig. 2 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 3 is a graph of astigmatism versus field curvature and distortion in accordance with a first embodiment of the present invention.
Fig. 4 is a graph of axial chromatic aberration in accordance with the first embodiment of the present invention.
FIG. 5 is a MTF graph according to a first embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a second embodiment of the present invention.
Fig. 7 is a graph of astigmatism versus field curvature and distortion for a second embodiment of the present invention.
Fig. 8 is a graph of axial chromatic aberration in the second embodiment of the present invention.
FIG. 9 is a MTF graph according to a second embodiment of the present invention.
The reference signs are: the lens comprises a first lens 10, an S1 surface 11, an S2 surface 12, a second lens 20, an S3 surface 21, an S4 surface 22, a third lens 30, an S5 surface 31, an S6 surface 32, an S7 surface 40, an aperture stop 50 and a vignetting stop 60.
Detailed Description
For further understanding of the features and technical means of the present invention, as well as the specific objects and functions attained by the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.
Refer to fig. 1 to 9.
The basic embodiment of the invention discloses a large-aperture three-piece optical lens, which comprises a first lens 10 with positive focal power, a second lens 20 with negative focal power and a third lens 30 with positive focal power, which are arranged in sequence along the light incidence direction, wherein the two surfaces of the first lens 10 are an S1 surface 11 and an S2 surface 12 respectively, the two surfaces of the second lens 20 are an S3 surface 21 and an S4 surface 22 respectively, the two surfaces of the third lens 30 are an S5 surface 31 and an S6 surface 32 respectively, the S1 surface 11, the S2 surface 12, the S3 surface 21, the S4 surface 22, the S5 surface 31 and the S6 surface 32 are arranged in sequence, the S6 surface 32 is provided with an S84 surface 40 on the side far from the S5 surface 31, the S7 surface 40 is an image surface, the S1 surface 11 is externally provided with an aperture stop 50, or the S2 surface 12 and the S3 surface are provided with an aperture stop 50, and the S375 and the S57311 surface is positioned on the side far from the S2 and is applied to a vehicle lamp surface, in consideration of the requirement of modeling design, the aperture stop 50 can be arranged between the S2 surface 12 and the S3 surface 21, so that the aperture stop 50 is hidden inside the integral optical lens, when the aperture stop 50 is applied to the vehicle lamp lens, no structural body of the aperture stop 50 can be observed outside the vehicle lamp lens, the vignetting stop 60 is arranged outside the S6 surface 32, namely the vignetting stop 60 is arranged between the S6 surface 32 and the S7 surface 40, the vignetting stop 60 is generally a lens frame, the S1 surface 11, the S2 surface 12 and the S5 surface 31 are convex surfaces, and the S4 surface 22 is a concave surface;
the distance between the aperture stop 50 and the object focus of the entire optical lens is | ST-FobjI, ST represents the distance between the aperture stop 50 and the center of the entire optical lens, FobiRepresenting the distance between the object focus of the whole optical lens and the center of the whole optical lens, and the equivalent focal length of the whole optical lens is f0Due to practical applicationIn use, the object-side focal point of the entire optical lens may be inside the first lens 10, and therefore the aperture stop 50 is disposed near the object-side focal point of the entire optical lens, that is, the following equation is satisfied: i ST-Fobj|＜0.8f0；
Respective diameters d of S1 surfaces 11 to S6 surfaces1～d6The following relationship is satisfied: di＞0.9djI is less than j, i is an integer of 1-5, i is an integer of 2-6, d is the aperture size of the corresponding optical surface, and along the incident direction of light, the aperture change from the S1 surface 11 to the S6 surface basically conforms to the gradually decreasing trend;
the radius of curvature of the S3 surface 21 is R3Radius of curvature R of S4 face 224，|R4|＜|R3The radius of curvature of the S5 surface 31 is R5And the radius of curvature of the S6 face 32 is R6，|R5|＜|R6I, the equivalent focal length of the first lens 10 is f1The third lens 30 has an equivalent focal length f3，|f1-f3|＜0.5*f1；
The center-to-center distance between the S4 surface 22 and the S5 surface 31 is G45The center-to-center distance between the S2 plane 12 and the S3 plane 21 is G23，G45＞G23。
In operation, light reaches the S1 surface 11, the S2 surface 12, the S3 surface 21, the S4 surface 22, the S5 surface 31, the S6 surface 32 and the S7 surface 40 in sequence. The optical lens can remarkably improve the dispersion performance of a vehicle headlamp, reduces the sensitivity of the lens to axial tolerance during assembly, and is high in assembly fault tolerance rate and low in assembly difficulty.
Based on the classical cuk three-piece lens system, as shown in fig. 1, an aperture stop 50 is generally disposed at the middle lens, and common aberrations, such as field curvature, astigmatism, chromatic aberration, and the like, can be reduced or corrected through structural symmetry. However, with this structure, on one hand, the numerical aperture is small, and on the other hand, the incident angle CRA of the chief ray of a large field of view at the image plane is large, the luminous intensity of a general light source satisfies the lambert cosine law, the light intensity is maximum at the 0-degree position, the light intensity is attenuated to 0.5 at the 60-degree position, and is 0 at the 90-degree position, and the large incident angle CRA means that the energy obtained by the lens system is lower for a solid angle of the same size.
The aperture diaphragm 50 is arranged at the object focus of the whole optical lens, so that an image-side telecentric light path can be formed, and the chief rays of all the fields are parallel, namely the incidence angles CRA of the chief rays of all the fields at the image surface, namely the S7 surface 40, are all 0, which means that the energy utilization rate of the invention is higher for solid angles with the same size. In practical application, the aperture stop 50 is arranged near the object focus of the whole optical lens, and the incident angles of the chief rays of each field of view at the image plane, i.e. the S7 plane 40, are all less than 20 °, so that the energy utilization rate is high.
In this embodiment, the back intercept of the whole optical lens is greater than 2mm, that is, the distance between the S6 surface 32 and the S7 surface 40 is greater than 2mm, and since the light source generates a certain amount of heat during application, the optical lens with three lenses has a sufficiently large back intercept, which can effectively avoid the problem that the parts are deformed due to heating.
In the present embodiment, the S3 surface 21 is convex.
In this embodiment, the S6 face 32 is planar or convex.
In the present embodiment, the S1 surface 11, the S2 surface 12, the S3 surface 21, the S4 surface 22, the S5 surface 31, and the S6 surface 32 are spherical or aspherical surfaces, that is, the S1 surfaces 11 to the S6 surfaces 32 may be all spherical surfaces, the S1 surfaces 11 to the S6 surfaces 32 are all aspherical surfaces, or the S1 surfaces 11 to the S6 surfaces 32 have spherical and aspherical surfaces, and a preferable design surface type is used when the surfaces are aspherical surfaces.
In the present embodiment, the first lens 10, the second lens 20, and the third lens 30 are single lenses or cemented lenses, that is, the first lens 10, the second lens 20, and the third lens 30 may all be single lenses, or the first lens 10, the second lens 20, and the third lens 30 may all be cemented lenses, or there are single lenses and cemented lenses in the first lens 10, the second lens 20, and the third lens 30. The cemented lens is also called achromatic lens, and is formed by cementing two single lenses, and the polychromatic imaging performance of the cemented lens is greatly improved compared with the polychromatic imaging performance of the single lenses.
In this embodiment, the first lens 10, the second lens 20, and the third lens 30 are glass lenses or plastic lenses, that is, the first lens 10, the second lens 20, and the third lens 30 may all be glass lenses, or the first lens 10, the second lens 20, and the third lens 30 may all be plastic lenses, or glass lenses and plastic lenses are present in the first lens 10, the second lens 20, and the third lens 30.
In the present embodiment, the abbe number of the optical material used for the first lens 10 is Vd1The abbe number of the optical material used for the second lens 20 is Vd2The abbe number of the optical material used for the third lens 30 is Vd3，Vd1-Vd2>25，Vd3-Vd2>25。
First embodiment, an optical lens structure is shown in fig. 2, and the optical lens is configured according to tables 1, 2, 3, and 4 below.
TABLE 1 parameters of the surfaces of example one
The aspherical expression is as follows:
wherein z is the rise of the position R on the aspheric surface, c is the paraxial curvature of the aspheric surface, c is 1/R, R is the curvature radius, k is a cone coefficient, and A to J are high-order secondary coefficient.
TABLE 2 example of aspheric parameters
TABLE 3 design parameters of an optical lens of the examples
TABLE 4 constraint relationships of example one
| Constraint conditions | Results |
| |ST-Fobj|<0.8f0 | |ST-Fobj1.02, | satisfying |
| Caliber size di>0.9*dj，i<j | From Table 1, it is found that |
| The S6 surface is provided with a |
1/2FOV vignetting coefficient 0.51 |
| |R4|<|R3| | From Table 1, it is found that |
| |R5|<|R6| | From Table 1, it is found that |
| R1>0 | From Table 1, it is found that |
| R2<0 | From Table 1, it is found that |
| R4>0 | From Table 1, it is found that |
| R5>0 | From Table 1, it is found that |
| |f1-f3|<0.5*f1 | From Table 3, it is found that |
| Rear intercept is larger than 2mm | As shown in Table 1, the rear intercept is 4.79mm and satisfies |
In summary, it can be seen that the numerical aperture of the first embodiment reaches 0.82, which is much larger than 0.2 of the cucko three-piece lens system, and the energy utilization rate is significantly improved. The astigmatism, field curvature curve and distortion curve of the first embodiment are shown in fig. 3, the on-axis aberration curve is shown in fig. 4, and the MTF (modulation transfer function) curve is shown in fig. 5, which indicates that the optical lens has good imaging quality when applied to a projection imaging system.
Second embodiment, an optical lens structure is as shown in fig. 6, and the optical lens is set according to tables 5, 6, 7, and 8 below.
TABLE 5 parameters of the surfaces of example two
The aspherical expression is as follows:
wherein z is the rise of the position R on the aspheric surface, c is the paraxial curvature of the aspheric surface, c is 1/R, R is the curvature radius, k is a cone coefficient, and A to J are high-order secondary coefficient.
TABLE 6 aspheric parameters of the second example
TABLE 7 design parameters of the second optical lens of the examples
TABLE 8 constraint relationships of example two
| Constraint conditions | Results |
| |ST-Fobj|<0.8fo | |ST-Fobj19.04, | satisfying |
| Caliber size di>0.9*dj，i<j | From Table 5, it is found that |
| The S6 surface is provided with a |
1/2FOV vignetting coefficient 0.36 |
| |R4|<|R3| | From Table 5, it is found that |
| |R5|<|R6| | From Table 5, it is found that |
| R1>0 | From Table 5, it is found that |
| R2<0 | From Table 5, it is found that |
| R4>0 | From Table 5, it is found that |
| R5>0 | From Table 5, it is found that |
| |f1-f3|<0.5*f1 | From Table 7, it is found that |
| Rear intercept is larger than 2mm | As shown in Table 5, the rear intercept is 6.1mm and satisfies |
In summary, it can be seen that the numerical aperture of the second embodiment reaches 0.80, which is much larger than 0.2 of the cucko three-piece lens system, and the energy utilization rate is significantly improved. The astigmatism curve and the distortion curve of the second embodiment are shown in fig. 7, the on-axis aberration curve is shown in fig. 8, and the MTF (modulation transfer function) curve is shown in fig. 9, so that it is known that the optical lens can meet the requirements of low imaging quality and high energy when applied to a projection imaging system.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A large-aperture three-piece optical lens comprising a first lens (10) having positive refractive power, a second lens (20) having negative refractive power, and a third lens (30) having positive refractive power, wherein the first lens (10) has S1 surface (11) and S2 surface (12) on both surfaces, the second lens (20) has S3 surface (21) and S4 surface (22) on both surfaces, the third lens (30) has S5 surface (31) and S6 surface (32) on both surfaces, the S1 surface (11), the S2 surface (12), the S3 surface (21), the S4 surface (22), the S5 surface (31), and the S6 surface (32) are sequentially arranged, an S7 surface (40) is disposed on a side of the S6 surface (32) far from the S5 surface (31), and an S1 or S1 surface (50) is disposed between the S6321 and S583 surface (22), a vignetting diaphragm (60) is arranged outside the S6 surface (32), the S1 surface (11), the S2 surface (12) and the S5 surface (31) are convex surfaces, and the S4 surface (22) is a concave surface;
the distance between the aperture diaphragm (50) and the object focus of the lens is | ST-FobjL, the equivalent focal length of the lens is f0，|ST-Fobj|<0.8f0；
A caliber d of the S1 surface (11) to the S6 surface (32)1～d6The following relationship is satisfied: di>0.9dj， i<j, i is an integer of 1-5, j is an integer of 2-6;
the radius of curvature of the S3 surface (21) is R3Radius of curvature R of the S4 surface (22)4，|R4|<|R3The radius of curvature of the S5 surface (31) is R5The radius of curvature of the S6 surface (32) is R6，|R5|<|R6L, the equivalent focal length of the first lens (10) is f1The third lens (30) has an equivalent focal length f3，|f1-f3|<0.5*f1；
The center-to-center distance between the S4 surface (22) and the S5 surface (31) is G45The center of the S2 face (12) is separated from the center of the S3 face (21) by a distance G23，G45>G23。
2. A large aperture three-plate optical lens as claimed in claim 1, wherein the distance between the S6 face (32) and the S7 face (40) is greater than 2 mm.
3. A large aperture three-plate optical lens as claimed in claim 1, wherein the S3 face (21) is convex.
4. A large aperture triplet optical lens as claimed in claim 1 wherein the S6 face (32) is either planar or convex.
5. A large aperture three-plate optical lens as claimed in claim 1, wherein the S1 surface (11), the S2 surface (12), the S3 surface (21), the S4 surface (22), the S5 surface (31) and the S6 surface (32) are spherical or aspherical.
6. A large aperture three-piece optical lens as claimed in claim 1, wherein the first lens (10), the second lens (20) and the third lens (30) are single lenses or cemented lenses.
7. A large aperture three-piece optical lens as claimed in claim 1, wherein the first lens (10), the second lens (20) and the third lens (30) are glass lenses or plastic lenses.
8. A large aperture triplet optical lens as claimed in claim 1 characterised in that the abbe number of the first lens (10) is Vd1The abbe number of the second lens (20) is Vd2The abbe number of the third lens (30) is Vd3，Vd1-Vd2>25，Vd3-Vd2>25。
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| CN114609752A (en) * | 2022-03-04 | 2022-06-10 | 广东烨嘉光电科技股份有限公司 | Six-piece type optical lens |
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