CN109782415B - Two-piece infrared single-wavelength projection lens set - Google Patents
Two-piece infrared single-wavelength projection lens set Download PDFInfo
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- CN109782415B CN109782415B CN201711119764.2A CN201711119764A CN109782415B CN 109782415 B CN109782415 B CN 109782415B CN 201711119764 A CN201711119764 A CN 201711119764A CN 109782415 B CN109782415 B CN 109782415B
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Abstract
The invention relates to a two-piece infrared single-wavelength projection lens group, which comprises the following components from an imaging side to an image source side in sequence: a first lens element with positive refractive power having a convex image-side surface at a paraxial region and a concave image-source side surface at a paraxial region, at least one of the image-side surface and the image-source side surface being aspheric; a second lens element with positive refractive power having a concave image-side surface at a paraxial region thereof and a convex image-source side surface at a paraxial region thereof, at least one of the image-side surface and the image-source side surface being aspheric; and the diaphragm is arranged in front of the image source side surface of the first lens or between the image source side surface of the first lens and the imaging side surface of the second lens. Therefore, the two-piece infrared single-wavelength projection lens set with a better image sensing function is achieved.
Description
Technical Field
The present invention relates to a projection lens assembly, and more particularly to a miniaturized two-piece infrared single-wavelength projection lens assembly applied to electronic products.
Background
Nowadays, digital imaging technology is continuously updated and changed, especially digital carriers of digital cameras and mobile phones are being miniaturized, so that the photosensitive devices such as CCD or CMOS are required to be more miniaturized, and besides being applied to the field of photography, the infrared focusing lens is also applied to the field of infrared receiving and sensing of game machines in recent years, and in order to make the range of sensing users of the game machines wider, the current lens group for receiving infrared wavelength is mostly the wide-angle lens group with larger field angle.
The applicant also previously proposed a plurality of lens sets related to infrared wavelength reception, but the current game machine mainly provides a 3D game with more stereoscopic, real and realistic feelings, but the current or previous lens sets of the applicant are all used for meeting the requirement of 2D plane game detection, so that the effect of 3D game emphasis depth sensing cannot be met.
Furthermore, regarding the dedicated infrared receiving and sensing lens set for game machine, in order to pursue low cost, plastic lenses are adopted, the poor light transmittance of the first material is one of the key factors that affect the depth detection precision of the game machine, and the second plastic lens is easy to change the focal length of the lens set due to the overheating or overcooling of the environment temperature, so that the precise focusing detection cannot be performed.
In view of the above, how to provide a lens assembly capable of accurately detecting and receiving depth distances and preventing the lens assembly from changing focal length to affect the depth detection effect is a technical bottleneck that needs to be overcome in the infrared wavelength receiving lens assembly.
Disclosure of Invention
The present invention provides a two-piece infrared single-wavelength projection lens set, and more particularly, to a two-piece infrared single-wavelength projection lens set with better image sensing function.
To achieve the above object, the present invention provides a two-piece infrared single-wavelength projection lens set, sequentially comprising: a first lens element with positive refractive power having a convex image-side surface at a paraxial region and a concave image-source side surface at a paraxial region, at least one of the image-side surface and the image-source side surface being aspheric; a second lens element with positive refractive power having a concave image-side surface at a paraxial region thereof and a convex image-source side surface at a paraxial region thereof, at least one of the image-side surface and the image-source side surface being aspheric; and the diaphragm is arranged in front of the image source side surface of the first lens or between the image source side surface of the first lens and the imaging side surface of the second lens.
Preferably, wherein the focal length of the first lens is f1, the focal length of the second lens is f2, and the following conditions are satisfied: 0.7< f1/f2< 1.4. Therefore, the refractive power configuration of the first lens element and the second lens element is suitable, which is beneficial to reducing the excessive increase of system aberration.
Preferably, the overall focal length of the two-piece infrared single-wavelength projection lens set is f, the focal length of the first lens is f1, and the following conditions are satisfied: 1.0< f/f1< 1.7. Therefore, the refractive power strength of the first lens element can be effectively controlled, so as to avoid poor light converging effect caused by too weak refractive power or excessive spherical aberration caused by too strong refractive power.
Preferably, the overall focal length of the two-piece infrared single-wavelength projection lens set is f, the focal length of the second lens is f2, and the following conditions are satisfied: 0.9< f/f2< 1.7. Thereby, the sensitivity can be advantageously reduced.
Preferably, wherein the focal length of the first lens is f1, the imaging-side surface of the first lens has a radius of curvature of R1, and the following condition is satisfied: 2.2< f1/R1< 3.0. Thus, distortion can be advantageously reduced.
Preferably, wherein the focal length of the first lens is f1, the radius of curvature of the image-source-side surface of the first lens is R2, and the following condition is satisfied: 0.85< f1/R2< 2.35. Therefore, the curvature of the image source side surface of the first lens is proper, and the total length of the two-piece infrared single-wavelength projection lens set is favorably shortened.
Preferably, wherein the focal length of the second lens is f2, the imaging-side surface of the second lens has a radius of curvature of R3, and the following condition is satisfied: -4.7< f2/R3< -2.5. Therefore, the sensitivity of the two-piece infrared single-wavelength projection lens set is reduced, and the production yield can be effectively improved.
Preferably, wherein the focal length of the second lens is f2, the radius of curvature of the image-source-side surface of the second lens is R4, and the following condition is satisfied: -3.9< f2/R4< -2.6. Therefore, the aberration of the two-piece infrared single-wavelength projection lens set can be corrected and the sensitivity of the two-piece infrared single-wavelength projection lens set can be reduced, so that the imaging quality can be improved.
Preferably, wherein the first lens has an image-side surface curvature radius of R1, and the first lens has an image-source-side surface curvature radius of R2, and the following conditions are satisfied: 0.25< R1/R2< 0.95. This is advantageous for correction of spherical aberration.
Preferably, wherein the second lens has an image-side surface curvature radius of R3 and an image-source-side surface curvature radius of R4, and the following conditions are satisfied: 0.6< R3/R4< 1.3. Therefore, the problem that the yield is reduced due to overhigh sensitivity caused by overlarge curvature of the image source side surface of the second lens can be avoided.
Preferably, wherein the first lens has an image-source-side surface curvature radius of R2, and the second lens has an image-source-side surface curvature radius of R4, and the following conditions are satisfied: -0.81< R2/R4< -0.13. Thereby, the aberration is corrected.
Preferably, wherein the first lens has an image source side surface curvature radius of R2, and the second lens has an image side surface curvature radius of R3, and the following conditions are satisfied: -3.4< R2/R3< -1.2. Thereby, the aberration is corrected.
Preferably, wherein the radius of curvature of the image-side surface of the first lens is R1, the radius of curvature of the image-source-side surface of the second lens is R4, and the following conditions are satisfied: -1.7< R1/R4< -0.8. Thereby, the aberration is corrected.
Preferably, the thickness of the first lens element on the optical axis is CT1, the thickness of the second lens element on the optical axis is CT2, and the following conditions are satisfied: 0.2< CT1/CT2< 1.3. Therefore, the lens is firmer in contact with the external environment and easy to maintain, and the appropriateness of products is improved.
Preferably, the overall focal length of the two-piece infrared single-wavelength projection lens set is f, the distance between the imaging-side surface of the first lens and the image source surface on the optical axis is TL, and the following conditions are satisfied: 0.7< f/TL < 1.2. Therefore, the two-piece infrared single-wavelength projection lens group can be miniaturized to be carried on a light and thin electronic product.
Preferably, wherein the refractive index of the first lens is n1, the refractive index of the second lens is n2, and the following conditions are satisfied: n1 > 1.6 and n2 > 1.6. Therefore, the lens matching and the blending of the whole two-piece infrared single-wavelength projection lens group are facilitated, and better aberration balancing capability is provided.
To achieve the above objects, the present invention provides a method, a device and a system for implementing the method, which are described in detail below with reference to the accompanying drawings.
Drawings
FIG. 1A is a schematic diagram of a two-piece infrared single-wavelength projection lens set according to a first embodiment of the present invention.
Fig. 1B is a graph sequentially showing a non-point differential collection curve and a distortion differential collection curve of the two-piece infrared single-wavelength projection lens set according to the first embodiment from left to right.
FIG. 2A is a schematic diagram of a two-piece infrared single-wavelength projection lens set according to a second embodiment of the present invention.
Fig. 2B is a graph sequentially showing the non-point differential collection and distortion differential collection curves of the two-piece infrared single-wavelength projection lens set according to the second embodiment from left to right.
FIG. 3A is a schematic diagram of a two-piece infrared single-wavelength projection lens set according to a third embodiment of the present invention.
Fig. 3B is a graph sequentially showing the non-point differential and distortion differential curves of the two-piece infrared single-wavelength projection lens set according to the third embodiment from left to right.
FIG. 4A is a schematic diagram of a two-piece infrared single-wavelength projection lens set according to a fourth embodiment of the present invention.
Fig. 4B is a graph sequentially showing the non-point differential and distortion differential curves of the two-piece infrared single-wavelength projection lens set according to the fourth embodiment from left to right.
FIG. 5A is a schematic diagram of a two-piece infrared single-wavelength projection lens set according to a fifth embodiment of the present invention.
Fig. 5B is a graph sequentially showing the non-point aberration and distortion aberration curves of the two-piece infrared single-wavelength projection lens set according to the fifth embodiment from left to right.
FIG. 6A is a schematic diagram of a two-piece infrared single-wavelength projection lens set according to a sixth embodiment of the present invention.
Fig. 6B is a graph sequentially showing the non-point aberration and distortion aberration curves of the two-piece infrared single-wavelength projection lens set according to the sixth embodiment from left to right.
Reference numerals indicate the same.
100. 200, 300, 400, 500, 600: aperture
110. 210, 310, 410, 510, 610: first lens
111. 211, 311, 411, 511, 611: imaging side surface
112. 212, 312, 412, 512, 612: side surface of image source
120. 220, 320, 420, 520, 620: second lens
121. 221, 321, 421, 521, 621: imaging side surface
122. 222, 322, 422, 522, 622: side surface of image source
180. 280, 380, 480, 580, 680: image source surface
190. 290, 390, 490, 590, 690: optical axis
f: focal length of two-piece infrared single-wavelength projection lens set
Fno: aperture value of two-piece infrared single-wavelength projection lens set
FOV: maximum field angle in two-piece infrared single-wavelength projection lens group
f 1: focal length of the first lens
f 2: focal length of the second lens
R1: radius of curvature of imaging side surface of first lens
R2: radius of curvature of image source side surface of first lens
R3: radius of curvature of imaging side surface of second lens
R4: radius of curvature of image source side surface of second lens
CT 1: thickness of the first lens on the optical axis
CT 2: thickness of the second lens on the optical axis
TL: distance between the imaging side surface of the first lens and the image source surface on the optical axis
Detailed Description
< first embodiment >
Referring to fig. 1A and fig. 1B, wherein fig. 1A is a schematic diagram of a two-piece infrared single-wavelength projection lens set according to a first embodiment of the invention, and fig. 1B is a graph of non-stippling difference and distortion difference of the two-piece infrared single-wavelength projection lens set of the first embodiment sequentially from left to right. As shown in fig. 1A, the two-piece infrared single-wavelength projection lens assembly includes an aperture 100 and an optical assembly, the optical assembly includes a first lens element 110, a second lens element 120, and an image source surface 180 in sequence from an imaging side to an image source side, wherein the two-piece infrared single-wavelength projection lens assembly includes two lens elements with refractive power. The aperture stop 100 is disposed between an image source side surface 112 of the first lens 110 and an image side surface 121 of the second lens 120.
The first lens element 110 with positive refractive power has a convex imaging-side surface 111 near the optical axis 190 and a concave image-source-side surface 112 near the optical axis 190, and the imaging-side surface 111 and the image-source-side surface 112 are aspheric.
The second lens element 120 with positive refractive power has a concave imaging-side surface 121 at a paraxial region 190 and a convex image-source-side surface 122 at a paraxial region 190, and both the imaging-side surface 121 and the image-source-side surface 122 are aspheric.
The curve equation of the aspherical surface of each lens described above is as follows:
wherein z is a position value referenced to the surface vertex at a position of height h along the optical axis 190; c is a curvature of the lens surface near the optical axis 190 and is an inverse of a curvature radius (R) (c is 1/R), R is a curvature radius of the lens surface near the optical axis 190, h is a perpendicular distance of the lens surface from the optical axis 190, k is a conic coefficient (conic constant), and A, B, C, D, E, G, … … are high order aspheric coefficients.
In the first embodiment of the two-piece infrared single-wavelength projection lens set, the focal length of the two-piece infrared single-wavelength projection lens set is f, the aperture value (f-number) of the two-piece infrared single-wavelength projection lens set is Fno, and the maximum field angle in the two-piece infrared single-wavelength projection lens set is FOV, which has the following values: f ═ 3.40 (millimeters); fno 2.5; and FOV is 14.8 (degrees).
In the first embodiment of the two-piece infrared single-wavelength projection lens set, the focal length of the first lens element 110 is f1, and the focal length of the second lens element 120 is f2, and the following conditions are satisfied: f1/f2 is 1.072.
In the first embodiment of the two-piece infrared single-wavelength projection lens set, the focal length of the two-piece infrared single-wavelength projection lens set is f, and the focal length of the first lens element 110 is f1, and the following conditions are satisfied: f/f1 ═ 1.336
In the first embodiment of the two-piece infrared single-wavelength projection lens set, the focal length of the two-piece infrared single-wavelength projection lens set is f, and the focal length of the second lens element 120 is f2, and the following conditions are satisfied: f/f2 is 1.432.
In the first embodiment of the two-piece infrared single-wavelength projection lens set, the focal length of the first lens element 110 is f1, the radius of curvature 111 of the image-side surface of the first lens element 110 is R1, and the following conditions are satisfied: f1/R1 ═ 2.785.
In the first embodiment of the two-piece infrared single-wavelength projection lens set, the focal length of the first lens element 110 is f1, the radius of curvature of the image-source-side surface 112 of the first lens element 110 is R2, and the following conditions are satisfied: f1/R2 equals 1.482.
In the first embodiment of the two-piece infrared single-wavelength projection lens set, the focal length of the second lens element 120 is f2, the radius of curvature 121 of the image-side surface of the second lens element 120 is R3, and the following conditions are satisfied: f 2/R3-4.344.
In the first embodiment of the two-piece infrared single-wavelength projection lens, the focal length of the second lens 120 is f2, the radius of curvature of the image source side surface 122 of the second lens 120 is R4, and the following conditions are satisfied: f 2/R4-3.624.
In the first embodiment of the two-piece infrared single-wavelength projection lens set, the radius of curvature of the image-side surface 111 of the first lens element 110 is R1, the radius of curvature of the image-source-side surface 112 of the first lens element 110 is R2, and the following conditions are satisfied: R1/R2 is 0.532.
In the first embodiment of the two-piece infrared single-wavelength projection lens set, the radius of curvature of the image-side surface 121 of the second lens element 120 is R3, the radius of curvature of the image-source-side surface 122 of the second lens element 120 is R4, and the following conditions are satisfied: R3/R4 ═ 0.834.
In the first embodiment of the two-piece infrared single-wavelength projection lens set, the radius of curvature of the image-source-side surface 112 of the first lens element 110 is R2, and the radius of curvature of the image-source-side surface 122 of the second lens element 120 is R4, and the following conditions are satisfied: R2/R4 ═ 0.382.
In the first embodiment of the two-piece infrared single-wavelength projection lens set, the radius of curvature of the image-source-side surface 112 of the first lens element 110 is R2, the radius of curvature of the image-side surface 121 of the second lens element 120 is R3, and the following conditions are satisfied: R2/R3 ═ 3.141.
In the first embodiment of the two-piece infrared single-wavelength projection lens set, the radius of curvature of the image-side surface 111 of the first lens element 110 is R1, and the radius of curvature of the image-source-side surface 122 of the second lens element 120 is R4, and the following conditions are satisfied: R1/R4 ═ 1.394.
In the first embodiment of the two-piece infrared single-wavelength projection lens set, the thickness of the first lens element 110 on the optical axis 190 is CT1, and the thickness of the second lens element 120 on the optical axis 190 is CT2, and the following conditions are satisfied: CT1/CT2 is 0.578.
In the first embodiment of the two-piece infrared single-wavelength projection lens assembly, the overall focal length of the two-piece infrared single-wavelength projection lens assembly is f, the distance between the image-side surface 111 of the first lens element 110 and the image source surface 180 on the optical axis 190 is TL, and the following conditions are satisfied: f/TL is 0.968.
In the first embodiment of the two-piece infrared single-wavelength projection lens set, the refractive index of the first lens element 110 is n1, the refractive index of the second lens element 120 is n2, and the following conditions are satisfied: n 1-1.636 and n 2-1.636.
Further, refer to the following Table 1 and Table 2.
Table 1 shows detailed structural data of the first embodiment of fig. 1A, wherein the unit of the radius of curvature, the thickness and the focal length is mm, and surfaces 0 to 7 sequentially represent the surfaces from the image side to the image source side. Table 2 shows aspheric data in the first embodiment, where k denotes a cone coefficient in the aspheric curve equation, and A, B, C, D, E, F and … … denote higher-order aspheric coefficients. In addition, the following tables of the embodiments correspond to the schematic diagrams and aberration graphs of the embodiments, and the definitions of the data in the tables are the same as those in tables 1 and 2 of the first embodiment, which are not repeated herein.
< second embodiment >
Referring to fig. 2A and fig. 2B, fig. 2A is a schematic diagram of a two-piece infrared single-wavelength projection lens set according to a second embodiment of the invention, and fig. 2B is a graph of non-stippling and skew difference curves of the two-piece infrared single-wavelength projection lens set of the second embodiment sequentially from left to right. As shown in fig. 2A, the two-piece infrared single-wavelength projection lens assembly includes an aperture stop 200 and an optical assembly, the optical assembly includes a first lens element 210, a second lens element 220, and an image plane 280 in sequence from an imaging side to an image source side, wherein the two-piece infrared single-wavelength projection lens assembly includes two lens elements with refractive power. The aperture stop 200 is disposed between the rubber-side surface 212 of the first lens 210 and the image-side surface 221 of the second lens 220.
The first lens element 210 with positive refractive power has a convex imaging-side surface 211 at a paraxial region 290, a concave image-source-side surface 212 at the paraxial region 290, and both the imaging-side surface 211 and the image-source-side surface 212 are aspheric.
The second lens element 220 with positive refractive power has a concave imaging-side surface 221 at a paraxial region 290 and a convex image-source-side surface 222 at the paraxial region 290, and the imaging-side surface 221 and the image-source-side surface 222 are aspheric.
Further, the following Table 3 and Table 4 are referred to.
In the second embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined as the same as those in the first embodiment, and are not repeated herein.
The following data can be derived from tables 3 and 4:
< third embodiment >
Referring to fig. 3A and fig. 3B, fig. 3A is a schematic diagram of a two-piece infrared single-wavelength projection lens set according to a third embodiment of the invention, and fig. 3B is a graph sequentially showing a non-stippling difference curve and a distortion difference curve of the two-piece infrared single-wavelength projection lens set according to the third embodiment from left to right. As shown in fig. 3A, the two-piece infrared single-wavelength projection lens assembly includes an aperture stop 300 and an optical assembly, the optical assembly includes a first lens element 310, a second lens element 320, and an image source surface 380 sequentially from an imaging side to an image source side, wherein the two-piece infrared single-wavelength projection lens assembly includes two lens elements with refractive power. The aperture stop 300 is disposed in front of the image source side surface 312 of the first lens 310.
The first lens element 310 with positive refractive power has a convex imaging-side surface 311 at a paraxial region 390, a concave image-source-side surface 312 at the paraxial region 390, and both the imaging-side surface 311 and the image-source-side surface 312 are aspheric.
The second lens element 320 with positive refractive power has a concave imaging-side surface 321 at the paraxial region 390, a convex image-source-side surface 322 at the paraxial region 390, and both the imaging-side surface 321 and the image-source-side surface 322 are aspheric.
Further, the following Table 5 and Table 6 were referred to.
In the third embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined as the same as the first embodiment, and are not repeated herein.
The following data can be derived from tables 5 and 6:
< fourth embodiment >
Referring to fig. 4A and 4B, fig. 4A is a schematic diagram of a two-piece infrared single-wavelength projection lens set according to a fourth embodiment of the invention, and fig. 4B is a graph sequentially showing a non-stippling difference curve and a distortion difference curve of the two-piece infrared single-wavelength projection lens set according to the fourth embodiment from left to right. As shown in fig. 4A, the two-piece infrared single-wavelength projection lens assembly includes an aperture 400 and an optical assembly, the optical assembly includes a first lens element 410, a second lens element 420 and an image source surface 480 in sequence from an imaging side to an image source side, wherein the two-piece infrared single-wavelength projection lens assembly includes two lens elements with refractive power. The aperture stop 400 is disposed in front of the image source side surface 422 of the first lens 410.
The first lens element 410 with positive refractive power has a convex imaging-side surface 411 at a paraxial region 490, a concave image-source-side surface 412 at the paraxial region 490, and both the imaging-side surface 411 and the image-source-side surface 412 are aspheric.
The second lens element 420 with positive refractive power has a concave imaging-side surface 421 near the optical axis 490, a convex image-source-side surface 422 near the optical axis 490, and both the imaging-side surface 421 and the image-source-side surface 422 are aspheric.
Further, the following Table 7 and Table 8 are referred to.
In the fourth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined as the same as the first embodiment, and are not repeated herein.
The following data can be derived from tables 7 and 8:
< fifth embodiment >
Referring to fig. 5A and 5B, fig. 5A is a schematic diagram of a two-piece infrared single-wavelength projection lens set according to a fifth embodiment of the invention, and fig. 5B is a graph sequentially showing a non-stippling difference curve and a distortion difference curve of the two-piece infrared single-wavelength projection lens set according to the fifth embodiment from left to right. As shown in fig. 5A, the two-piece infrared single-wavelength projection lens assembly includes an aperture stop 500 and an optical assembly, the optical assembly includes a first lens element 510, a second lens element 520, and an image plane 580 in sequence from an image side to an image source side, wherein the two-piece infrared single-wavelength projection lens assembly includes two lens elements with refractive power. The aperture stop 500 is disposed in front of the image source side surface 512 of the first lens 510.
The first lens element 510 with positive refractive power has a convex imaging-side surface 511 at a paraxial region 590, a concave imaging-side surface 512 at a paraxial region 590, and both the imaging-side surface 511 and the image-source side surface 512 are aspheric.
The second lens element 520 with positive refractive power has a concave imaging-side surface 521 at a paraxial region 590, a convex image-source-side surface 522 at a paraxial region 590, and both the imaging-side surface 521 and the image-source-side surface 522 are aspheric.
Further, the following table 9 and table 10 are referred to.
In the fifth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined as the same as the first embodiment, and are not repeated herein.
The following data can be derived from tables 9 and 10:
< sixth embodiment >
Referring to fig. 6A and 6B, fig. 6A is a schematic diagram of a two-piece infrared single-wavelength projection lens set according to a sixth embodiment of the invention, and fig. 6B is a graph sequentially showing a non-stippling difference curve and a distortion difference curve of the two-piece infrared single-wavelength projection lens set according to the sixth embodiment from left to right. As shown in fig. 6A, the two-piece infrared single-wavelength projection lens assembly includes an aperture 600 and an optical assembly, the optical assembly includes a first lens element 610, a second lens element 620, and an image source surface 680 sequentially from an imaging side to an image source side, wherein the two-piece infrared single-wavelength projection lens assembly includes two lens elements with refractive power. The aperture 600 is disposed in front of an image source side surface 612 of the first lens 610.
The first lens element 610 with positive refractive power has a convex imaging-side surface 611 at a paraxial region 690 and a concave image-source-side surface 612 at a paraxial region 690, and both the imaging-side surface 611 and the image-source-side surface 612 are aspheric.
The second lens element 620 with positive refractive power has a concave imaging-side surface 621 near the optical axis 690 and a convex image-source-side surface 622 near the optical axis 690, and the imaging-side surface 621 and the image-source-side surface 622 are aspheric.
Further, the following table 11 and table 12 are referred to.
In the sixth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined as the same as the first embodiment, and are not repeated herein.
The following data can be derived from tables 11 and 12:
in the two-piece infrared single-wavelength projection lens set provided by the invention, the material of the lens can be plastic or glass, when the material of the lens is plastic, the production cost can be effectively reduced, and when the material of the lens is glass, the degree of freedom of refractive power configuration of the two-piece infrared single-wavelength projection lens set can be increased. In addition, the imaging side surface and the image source side surface of the lens in the two-piece infrared single-wavelength projection lens set can be aspheric surfaces, the aspheric surfaces can be easily made into shapes other than spherical surfaces, more control variables are obtained to reduce aberration, and the number of the used lenses is further reduced, so that the total length of the two-piece infrared single-wavelength projection lens set can be effectively reduced.
In the two-piece infrared single-wavelength projection lens set provided by the invention, regarding the lens with refractive power, if the lens surface is a convex surface and the position of the convex surface is not defined, the lens surface is a convex surface at a paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at the paraxial region.
It should be noted that the above-mentioned embodiments and drawings are only preferred embodiments of the present invention, and the scope of the present invention should not be limited thereby.
Claims (15)
1. A two-piece infrared single-wavelength projection lens set is characterized by sequentially comprising, from an image side to an image source side:
a first lens element with positive refractive power having a convex image-side surface at a paraxial region and a concave image-source side surface at a paraxial region, at least one of the image-side surface and the image-source side surface being aspheric;
a second lens element with positive refractive power having a concave image-side surface at a paraxial region thereof and a convex image-source side surface at a paraxial region thereof, at least one of the image-side surface and the image-source side surface being aspheric;
an aperture stop disposed in front of the image source side surface of the first lens or between the image source side surface of the first lens and the image side surface of the second lens;
the focal length of the first lens is f1, the radius of curvature of the imaging side surface of the first lens is R1, and the following conditions are satisfied: 2.2< f1/R1< 3.0.
2. The two-piece infrared single wavelength projection lens set of claim 1 wherein the first lens has a focal length of f1 and the second lens has a focal length of f2, wherein the following conditions are satisfied: 0.7< f1/f2< 1.4.
3. The two-piece infrared single wavelength projection lens assembly of claim 1 wherein the overall focal length of the two-piece infrared single wavelength projection lens assembly is f, the focal length of the first lens element is f1, and the following conditions are satisfied: 1.0< f/f1< 1.7.
4. The two-piece infrared single wavelength projection lens assembly of claim 1 wherein the overall focal length of the two-piece infrared single wavelength projection lens assembly is f, the focal length of the second lens element is f2, and the following conditions are satisfied: 0.9< f/f2< 1.7.
5. The two-piece infrared single wavelength projection lens set of claim 1 wherein the first lens has a focal length of f1 and an image-source-side surface radius of curvature of R2, wherein the following conditions are satisfied: 0.85< f1/R2< 2.35.
6. The two-piece infrared single wavelength projection lens package of claim 1 wherein the second lens has a focal length of f2 and an imaging side surface with a radius of curvature of R3, wherein the following conditions are satisfied: -4.7< f2/R3< -2.5.
7. The two-piece infrared single wavelength projection lens assembly of claim 1 wherein the second lens element has a focal length of f2 and an image-source-side surface with a radius of curvature of R4, wherein the following conditions are satisfied: -3.9< f2/R4< -2.6.
8. The two-piece infrared single wavelength projection lens package of claim 1, wherein the first lens element has an image-side surface with a radius of curvature of R1 and an image-source side surface with a radius of curvature of R2, wherein the following conditions are satisfied: 0.25< R1/R2< 0.95.
9. The two-piece infrared single wavelength projection lens package of claim 1, wherein the second lens element has an image-side surface with a radius of curvature of R3 and an image-source side surface with a radius of curvature of R4, wherein the following conditions are satisfied: 0.6< R3/R4< 1.3.
10. The two-piece infrared single wavelength projection lens package of claim 1 wherein the first lens element has a source-side surface curvature radius of R2 and the second lens element has a source-side surface curvature radius of R4, wherein the following conditions are satisfied: -0.81< R2/R4< -0.13.
11. The two-piece infrared single wavelength projection lens package of claim 1 wherein the first lens element has a source-side surface curvature radius of R2 and the second lens element has an image-side surface curvature radius of R3, wherein the following conditions are satisfied: -3.4< R2/R3< -1.2.
12. The two-piece infrared single wavelength projection lens package of claim 1 wherein the first lens element has an image-side surface with a radius of curvature of R1 and the second lens element has an image-source side surface with a radius of curvature of R4, wherein the following conditions are satisfied: -1.7< R1/R4< -0.8.
13. The two-piece infrared single wavelength projection lens assembly of claim 1 wherein the first lens element has an optical thickness CT1 and the second lens element has an optical thickness CT2, wherein the following conditions are satisfied: 0.2< CT1/CT2< 1.3.
14. The two-piece infrared single-wavelength projection lens assembly of claim 1, wherein the overall focal length of the two-piece infrared single-wavelength projection lens assembly is f, the distance from the image-side surface to the image-source surface of the first lens element on the optical axis is TL, and the following conditions are satisfied: 0.7< f/TL < 1.2.
15. The two-piece infrared single wavelength projection lens package of claim 1 wherein the refractive index of the first lens element is n1 and the refractive index of the second lens element is n2, wherein the following conditions are satisfied: n1 > 1.6 and n2 > 1.6.
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| CN201711119764.2A CN109782415B (en) | 2017-11-14 | 2017-11-14 | Two-piece infrared single-wavelength projection lens set |
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| CN109782415B true CN109782415B (en) | 2021-02-26 |
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| CN116909001A (en) * | 2023-07-14 | 2023-10-20 | 云南驰宏国际锗业有限公司 | High-resolution long-focus infrared sighting telescope |
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