CN111273431B - Three-piece infrared wavelength projection lens set - Google Patents
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- CN111273431B CN111273431B CN201811471878.8A CN201811471878A CN111273431B CN 111273431 B CN111273431 B CN 111273431B CN 201811471878 A CN201811471878 A CN 201811471878A CN 111273431 B CN111273431 B CN 111273431B
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Abstract
The invention relates to a three-piece infrared wavelength projection lens group, which comprises the following components in sequence from an imaging side to an image source side: an aperture; 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; the second lens element with negative refractive power has a concave image-source-side surface at the paraxial region; and a third lens element with positive refractive power having a concave image-side surface at the paraxial region and a convex image-source side surface at the paraxial region. Therefore, the three-piece infrared wavelength projection lens set with better image sensing function is achieved.
Description
Technical Field
The present invention relates to a projection lens assembly, and more particularly to a miniaturized three-piece infrared wavelength projection lens assembly for use in electronic products.
Background
Nowadays, digital image technology is continuously updated and changed, especially digital carriers of digital cameras and mobile phones are all developed to be miniaturized, so that photosensitive devices such as CCD or CMOS are also required to be more miniaturized, and in addition to being applied to the field of infrared focusing lens, in recent years, the infrared focusing lens is also widely used in the field of infrared receiving and sensing of game machines, and in order to make the game machines sense a wider range of users, the current lens group for receiving infrared wavelengths is mostly the wide-angle lens group with a larger drawing angle.
The applicant has also previously proposed a plurality of lens sets related to infrared wavelength reception, but the current game machines are mainly 3D games with more three-dimensional, real and more realistic sense, while the current or previous lens sets of the applicant have been required to be detected by 2D plane games, so that the depth sensing effect of 3D game emphasis cannot be satisfied.
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, as mentioned above, the current infrared wavelength receiving lens set cannot satisfy two technical problems of the precise sensing of the depth distance of the 3D game.
Therefore, how to provide a lens assembly with accurate depth distance detection and reception and prevent the lens assembly from varying its focal length to affect the depth detection effect is a technical bottleneck that infrared wavelength receiving lens assemblies are currently in the limelight to overcome.
Disclosure of Invention
The invention provides a three-piece infrared wavelength projection lens set, and mainly aims to provide a three-piece infrared wavelength projection lens set with a better image sensing function.
In order to achieve the above object, the present invention provides a three-piece infrared wavelength projection lens set, sequentially comprising: an aperture; the first lens element with positive refractive power has a convex imaging-side surface at the paraxial region and a concave image-source-side surface at the paraxial region, and at least one of the imaging-side surface and the image-source-side surface is aspheric; the second lens element with negative refractive power has a concave image-source side surface at the paraxial region thereof, and at least one of the image-source side surface and the image-source side surface thereof is aspheric; and a third lens element with positive refractive power having a concave image-side surface at the paraxial region and a convex image-source side surface at the paraxial region, wherein at least one of the image-side surface and the image-source side surface is aspheric.
Preferably, the overall focal length of the three-piece infrared wavelength projection lens set is f, and the combined focal length of the first lens and the second lens is f12, and the following conditions are satisfied: 0.4< f/f12< 1.2. Therefore, by properly configuring the refractive powers of the first lens element and the second lens element, the advantages of large viewing angle and miniaturization can be effectively achieved.
Preferably, the overall focal length of the three-piece infrared wavelength projection lens set is f, and the combined focal length of the second lens and the third lens is f23, and the following conditions are satisfied: 0.6< f/f23< 1.8. Therefore, the three-piece infrared wavelength projection lens set can balance shortening of the total optical length and correction of aberration.
Preferably, the focal length of the first lens is f1, the focal length of the second lens is f2, and the following conditions are satisfied: -3.0< f1/f2< -1.2. 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 the system aberration.
Preferably, the focal length of the second lens is f2, the focal length of the third lens is f3, and the following conditions are satisfied: -1.3< f2/f3< -0.1. Therefore, the refractive power configurations of the second lens element and the third lens element are balanced, which is helpful for aberration correction and sensitivity reduction.
Preferably, the focal length of the first lens is f1, the focal length of the third lens is f3, and the following conditions are satisfied: 0.7< f1/f3< 1.8. Therefore, the positive refractive power of the first lens element is effectively distributed, and the sensitivity of the three-piece infrared wavelength projection lens assembly is reduced.
Preferably, the focal length of the first lens is f1, the combined focal length of the second lens and the third lens is f23, and the following conditions are satisfied: 0.1< f1/f23< 1.2. Therefore, the resolution capability of the three-piece infrared wavelength projection lens set is remarkably improved.
Preferably, the combined focal length of the first lens and the second lens is f12, the focal length of the third lens is f3, and the following conditions are satisfied: 2.3< f12/f3< 4.4. Therefore, the resolution capability of the three-piece infrared wavelength projection lens set is remarkably improved.
Preferably, 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 first lens is R2, and the following conditions are satisfied: 0.01< R1/R2< 1.04. Therefore, the spherical aberration and astigmatism of the three-piece infrared wavelength projection lens set are effectively reduced.
Preferably, the radius of curvature of the image-side surface of the second lens is R3, the radius of curvature of the image-source-side surface of the second lens is R4, and the following conditions are satisfied: -1.65< R3/R4< 13.5. Therefore, the spherical aberration and astigmatism of the three-piece infrared wavelength projection lens set are effectively reduced.
Preferably, the radius of curvature of the image-side surface of the third lens is R5, the radius of curvature of the image-source-side surface of the third lens is R6, and the following conditions are satisfied: 1.6< R5/R6< 4.4. Therefore, the spherical aberration and astigmatism of the three-piece infrared wavelength projection lens set are effectively reduced.
Preferably, the thickness of the first lens element along the optical axis is CT1, the thickness of the second lens element along the optical axis is CT2, and the following conditions are satisfied: 2.5< CT1/CT2< 4.0. This contributes to the moldability and homogeneity of the lens.
Preferably, the second lens element has a thickness CT2 along the optical axis, and the third lens element has a thickness CT3 along the optical axis, and the following conditions are satisfied: 0.05< CT2/CT3< 1.05. Thereby, an appropriate balance between imaging quality and sensitivity is obtained.
Preferably, the thickness of the first lens element along the optical axis is CT1, the thickness of the third lens element along the optical axis is CT3, and the following conditions are satisfied: 0.6< CT1/CT3< 2.6. This contributes to the moldability and homogeneity of the lens.
Preferably, the overall focal length of the three-piece infrared wavelength projection lens set is f, the distance between the imaging-side surface of the first lens element and the image source surface on the optical axis is TL, and the following conditions are satisfied: 0.7< f/TL < 1.9. Therefore, the three-piece infrared wavelength projection lens set can be kept miniaturized and can be favorably carried on light and thin electronic products.
Preferably, the refractive index of the first lens is n1, the refractive index of the second lens is n2, and the refractive index of the third lens is n3, and the following conditions are satisfied: 1.5< n1, n2, n3< 1.7. Thereby, a larger refractive index is provided to enhance the refractive power of the lens.
Drawings
Fig. 1A is a schematic view of a three-piece infrared wavelength projection lens set according to embodiment 1 of the present invention.
Fig. 1B is a graph sequentially showing the non-point aberration and distortion aberration curves of the three-piece infrared wavelength projection lens assembly of example 1 from left to right.
Fig. 2A is a schematic view of a three-piece infrared wavelength projection lens set in embodiment 2 of the invention.
Fig. 2B is a graph of non-point aberration and distortion aberration curves of the three-piece infrared wavelength projection lens assembly of embodiment 2 in order from left to right.
Fig. 3A is a schematic view of a three-piece infrared wavelength projection lens set according to embodiment 3 of the present invention.
Fig. 3B is a graph of non-point aberration and distortion aberration curves of the three-piece infrared wavelength projection lens assembly of embodiment 3 in order from left to right.
Fig. 4A is a schematic view of a three-piece infrared wavelength projection lens set according to embodiment 4 of the present invention.
Fig. 4B is a graph of non-point aberration and distortion aberration curves of the three-piece infrared wavelength projection lens assembly of embodiment 4 in order from left to right.
Fig. 5A is a schematic view of a three-piece infrared wavelength projection lens set according to embodiment 5 of the invention.
FIG. 5B is a graph showing the non-point aberration and distortion aberration curves of the three-piece infrared wavelength projection lens assembly of example 5 from left to right.
Fig. 6A is a schematic view of a three-piece infrared wavelength projection lens set according to embodiment 6 of the present invention.
FIG. 6B is a graph showing the non-point aberration and distortion aberration curves of the three-piece infrared wavelength projection lens assembly of example 6 from left to right.
Description of the symbols in the drawings:
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
130. 230, 330, 430, 530, 630: third lens
131. 231, 331, 431, 531, 631: imaging side surface
132. 232, 332, 432, 532, 632: 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 three-piece infrared wavelength projection lens set
Fno: aperture value of three-piece infrared wavelength projection lens set
FOV: maximum field angle in three-piece infrared wavelength projection lens group
f 1: focal length of the first lens
f 2: focal length of the second lens
f 3: focal length of the third lens
f 12: the combined focal length of the first lens and the second lens
f 23: the combined focal length of the second lens and the third 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
R5: radius of curvature of imaging side surface of third lens
R6: radius of curvature of image source side surface of third lens
CT 1: thickness of the first lens on the optical axis
CT 2: thickness of the second lens on the optical axis
CT 3: thickness of the third 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
n 1: refractive index of the first lens
n 2: refractive index of the second lens
n 3: refractive index of third lens
Detailed Description
The technical solutions of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1:
as shown in fig. 1A and fig. 1B, fig. 1A is a schematic view illustrating a three-piece infrared wavelength projection lens set according to embodiment 1 of the present invention, and fig. 1B is a graph sequentially showing a non-point aberration curve and a distortion aberration curve of the three-piece infrared wavelength projection lens set according to embodiment 1 from left to right.
The present invention provides a three-piece infrared wavelength projection lens assembly, as shown in fig. 1A, the three-piece infrared wavelength projection lens assembly sequentially comprises an aperture 100, a first lens 110, a second lens 120, a third lens 130, and an image plane 180 along an optical axis 190 from an imaging side to an image source side, wherein the three-piece infrared wavelength projection lens assembly comprises three lenses (110, 120, 130) with refractive power, and an air space is formed between any two adjacent lenses of the three-piece infrared wavelength projection lens assembly on the optical axis 190.
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 negative refractive power has a convex imaging-side surface 121 at a paraxial region 190 and a concave image-source-side surface 122 at a paraxial region 190, and the imaging-side surface 121 and the image-source-side surface 122 are aspheric.
The third lens element 130 with positive refractive power has a convex imaging-side surface 131 at a paraxial region 190 and a concave image-source-side surface 132 at a paraxial region 190, and the imaging-side surface 131 and the image-source-side surface 132 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, F, G, … … are high order aspheric coefficients.
In the three-piece infrared wavelength projection lens assembly of example 1, the focal length of the three-piece infrared wavelength projection lens assembly is f, the aperture value (f-number) of the three-piece infrared wavelength projection lens assembly is Fno, and the maximum field angle (view angle) of the three-piece infrared wavelength projection lens assembly is FOV, which are as follows: f ═ 4.48 (millimeters); fno 2.88; and FOV 13.4 (degrees).
In the three-piece infrared wavelength projection lens assembly of embodiment 1, the overall focal length of the three-piece infrared wavelength projection lens assembly is f, the combined focal length of the first lens element 110 and the second lens element 120 is f12, and the following conditions are satisfied: f/f12 is 0.79.
In the three-piece infrared wavelength projection lens assembly of embodiment 1, the overall focal length of the three-piece infrared wavelength projection lens assembly is f, and the combined focal length of the second lens element 120 and the third lens element 130 is f23, and the following conditions are satisfied: f/f23 is 1.36.
In the three-piece infrared wavelength projection lens assembly of embodiment 1, the focal length of the first lens element 110 is f1, the focal length of the second lens element 120 is f2, and the following conditions are satisfied: f1/f2 is-2.59.
In the three-piece infrared wavelength projection lens assembly of embodiment 1, the focal length of the second lens element 120 is f2, the focal length of the third lens element 130 is f3, and the following conditions are satisfied: f2/f3 is-0.53.
In the three-piece infrared wavelength projection lens assembly of embodiment 1, the focal length of the first lens element 110 is f1, the focal length of the third lens element 130 is f3, and the following conditions are satisfied: f1/f3 equals 1.36.
In the three-piece infrared wavelength projection lens assembly of embodiment 1, the focal length of the first lens element 110 is f1, and the combined focal length of the second lens element 120 and the third lens element 130 is f23, wherein the following conditions are satisfied: f1/f23 is 0.60.
In the three-piece infrared wavelength projection lens assembly of embodiment 1, the combined focal length of the first lens element 110 and the second lens element 120 is f12, the focal length of the third lens element 130 is f3, and the following conditions are satisfied: f12/f3 is 3.87.
In the three-piece infrared wavelength projection lens assembly of embodiment 1, 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 ═ 0.40.
In the three-piece infrared wavelength projection lens assembly of embodiment 1, 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 is 12.82.
In the three-piece infrared wavelength projection lens assembly of embodiment 1, the radius of curvature of the image-side surface 131 of the third lens element 130 is R5, the radius of curvature of the image-source-side surface 132 of the third lens element 130 is R6, and the following conditions are satisfied: R5/R6 ═ 2.88.
In the three-piece infrared wavelength projection lens assembly of embodiment 1, the thickness of the first lens element 110 along the optical axis 190 is CT1, the thickness of the second lens element 120 along the optical axis 190 is CT2, and the following conditions are satisfied: CT1/CT2 is 3.42.
In the three-piece infrared wavelength projection lens assembly of embodiment 1, the thickness of the second lens element 120 along the optical axis 190 is CT2, the thickness of the third lens element 130 along the optical axis 190 is CT3, and the following conditions are satisfied: CT2/CT3 is 0.40.
In the three-piece infrared wavelength projection lens assembly of embodiment 1, the thickness of the first lens element 110 on the optical axis 190 is CT1, the thickness of the third lens element 130 on the optical axis 190 is CT3, and the following conditions are satisfied: CT1/CT3 equals 1.37.
In the three-piece infrared wavelength projection lens assembly of embodiment 1, the overall focal length of the three-piece infrared 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 1.35.
The set of three-piece infrared wavelength projection lenses of embodiment 1, wherein the refractive index of the first lens 110 is n1, the refractive index of the second lens 120 is n2, and the refractive index of the third lens 130 is n3, and the following conditions are satisfied: n1, n2 and n3 are 1.64.
Further, the following tables 1 and 2 were referred to.
Table 1 shows the detailed structural data of embodiment 1 of FIG. 1A, wherein the unit of the radius of curvature, the thickness and the focal length is mm, and surfaces 0-9 sequentially represent the surfaces from the imaging side to the image source side. Table 2 shows aspheric data in example 1, where k denotes a cone coefficient in the aspheric curve equation and A, B, C, D, E, F, G … … denotes a higher-order aspheric coefficient. 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 embodiment 1.
Example 2:
as shown in fig. 2A and fig. 2B, fig. 2A is a schematic diagram of a three-piece infrared wavelength projection lens assembly according to embodiment 2 of the present invention, and fig. 2B is a graph of non-point aberration and distortion aberration curves of the three-piece infrared wavelength projection lens assembly of embodiment 2 from left to right.
As shown in fig. 2A, the three-piece infrared wavelength projection lens assembly sequentially includes an aperture stop 200, a first lens element 210, a second lens element 220, a third lens element 230, and an image plane 280 along an optical axis 290 from an imaging side to an image source side, wherein the three-piece infrared wavelength projection lens assembly includes three lens elements (210, 220, 230) with refractive power, and an air space is formed between any two adjacent lens elements of the three-piece infrared wavelength projection lens assembly on the optical axis 290.
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 negative refractive power has a convex imaging-side surface 221 at a paraxial region 290 and a concave 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.
The third lens element 230 with positive refractive power has a concave imaging-side surface 231 at a paraxial region 290, a convex image-source-side surface 232 at the paraxial region 290, and both the imaging-side surface 231 and the image-source-side surface 232 are aspheric.
Further, refer to the following tables 3 and 4.
In example 2, the curve equation of the aspherical surface shows the form as in example 1. In addition, the following parameters are defined as in example 1 and are not repeated herein.
The following data can be derived from tables 3 and 4:
example 3:
as shown in fig. 3A and fig. 3B, wherein fig. 3A is a schematic diagram of a three-piece infrared wavelength projection lens assembly according to embodiment 3 of the present invention, and fig. 3B is a graph of non-point aberration and distortion aberration curves of the three-piece infrared wavelength projection lens assembly of embodiment 3 from left to right. As shown in fig. 3A, the three-piece infrared wavelength projection lens assembly includes an aperture stop 300, a first lens element 310, a second lens element 320, a third lens element 330, and an image plane 380 along an optical axis 390 in order from an imaging side to an image source side, wherein the three-piece infrared wavelength projection lens assembly includes three refractive lenses (310, 320, 330), and an air space is formed between any two adjacent lens elements of the three-piece infrared wavelength projection lens assembly on the optical axis 390.
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 negative refractive power has a convex imaging-side surface 321 at a paraxial region 390, a concave 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.
The third lens element 330 with positive refractive power has a concave imaging-side surface 331 at a paraxial region 390, a convex image-source-side surface 332 at the paraxial region 390, and both the imaging-side surface 331 and the image-source-side surface 332 are aspheric.
The following tables 5 and 6 were referred to.
In example 3, the curve equation of the aspherical surface shows the form as in example 1. In addition, the following parameters are defined as in example 1 and are not repeated herein.
The following data can be derived from tables 5 and 6:
example 4:
as shown in fig. 4A and 4B, fig. 4A is a schematic view of a three-piece infrared wavelength projection lens assembly according to embodiment 4 of the present invention, and fig. 4B is a graph of non-point aberration and distortion aberration curves of the three-piece infrared wavelength projection lens assembly of embodiment 4 from left to right. As shown in fig. 4A, the three-piece infrared wavelength projection lens assembly sequentially includes an aperture stop 400, a first lens element 410, a second lens element 420, a third lens element 430, and an image plane 480 along an optical axis 490 from an imaging side to an image source side, wherein the three-piece infrared wavelength projection lens assembly includes three refractive lenses (410, 420, and 430), and an air space is formed between any two adjacent lens elements of the three-piece infrared wavelength projection lens assembly on the optical axis 490.
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 421 and the image-source-side surface 422 are aspheric.
The second lens element 420 with negative refractive power has a convex imaging-side surface 421 near the optical axis 490, a concave 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.
The third lens element 430 with positive refractive power has a concave imaging-side surface 431 at a paraxial region 490 and a convex image-source-side surface 432 at the paraxial region 490, and is made of plastic material, wherein the imaging-side surface 431 and the image-source-side surface 432 are aspheric.
Further, refer to the following tables 7 and 8.
In example 4, the curve equation of the aspherical surface shows the form as in example 1. In addition, the following parameters are defined as in example 1 and are not repeated herein.
The following data can be derived from tables 7 and 8:
example 5:
referring to fig. 5A and 5B, wherein fig. 5A is a schematic view of a three-piece infrared wavelength projection lens set according to embodiment 5 of the invention, and fig. 5B is a graph of non-aberration and distortion aberration curves of the three-piece infrared wavelength projection lens set of embodiment 5 from left to right. As shown in fig. 5A, the three-piece infrared wavelength projection lens assembly includes an aperture stop 500, a first lens element 510, a second lens element 520, a third lens element 530, and an image plane 580 along an optical axis 590 in order from an imaging side to an image source side, wherein the three-piece infrared wavelength projection lens assembly includes three refractive lenses (510, 520, 530), and an air space is formed between any two adjacent lens elements of the three-piece infrared wavelength projection lens assembly on the optical axis 590.
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 negative refractive power has a concave imaging-side surface 521 at a paraxial region 590, a concave image-source-side surface 522 at a paraxial region 590, and both the imaging-side surface 511 and the image-source-side surface 512 are aspheric.
The third lens element 530 with positive refractive power has a concave image-side surface 531 at a paraxial region 590, a convex image-source side surface 532 at a paraxial region 590, and both the image-side surface 531 and the image-source side surface 532 are aspheric.
Further, refer to the following table 9 and table 10.
In example 5, the curve equation of the aspherical surface shows the form as in example 1. In addition, the following parameters are defined as in example 1 and are not repeated herein.
The following data can be derived from tables 9 and 10:
example 6:
as shown in fig. 6A and 6B, fig. 6A is a schematic view of a three-piece infrared wavelength projection lens assembly according to embodiment 6 of the present invention, and fig. 6B is a graph of non-point aberration and distortion aberration curves of the three-piece infrared wavelength projection lens assembly of embodiment 6 from left to right. As shown in fig. 6A, the three-piece infrared wavelength projection lens assembly sequentially includes an aperture 600, a first lens element 610, a second lens element 620, a third lens element 630 and an image plane 680 along an optical axis 690 from an image side to an image source side, wherein the three-piece infrared wavelength projection lens assembly includes three refractive lenses (610, 620, 630), and an air space is formed between any two adjacent lens elements of the three-piece infrared wavelength projection lens assembly on the optical axis 690.
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 the imaging-side surface 611 and the image-source-side surface 612 are aspheric.
The second lens element 620 with negative refractive power has a convex imaging-side surface 621 near the optical axis 690 and a concave image-source-side surface 622 near the optical axis 690, and the imaging-side surface 611 and the image-source-side surface 612 are aspheric.
The third lens element 630 with positive refractive power is made of plastic, and has a concave imaging-side surface 631 near the optical axis 690 and a convex image-source-side surface 632 near the optical axis 690, wherein the imaging-side surface 631 and the image-source-side surface 632 are aspheric.
Further, refer to the following table 11 and table 12.
In example 6, the curve equation of the aspherical surface shows the form as in example 1. In addition, the following parameters are defined as in example 1 and are not repeated herein.
The following data can be derived from tables 11 and 12:
the three-piece infrared wavelength projection lens set provided by the invention has the advantages that the material of the lens can be plastic or glass, the production cost can be effectively reduced when the material of the lens is plastic, and in addition, the degree of freedom of the configuration of the refractive power of the three-piece infrared wavelength projection lens set can be increased when the material of the lens is glass. In addition, the imaging side surface and the image source side surface of the lens in the three-piece infrared wavelength projection lens group 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 three-piece infrared wavelength projection lens group can be effectively reduced.
In the three-piece infrared wavelength projection lens assembly provided by the invention, regarding the lens with refractive power, if the lens surface is convex and the position of the convex is not defined, the lens surface is convex at the position close to the optical axis; 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.
In summary, the above embodiments are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (15)
1. A three-piece infrared wavelength projection lens set, in order from an image side to an image source side, comprising:
an aperture;
the first lens element with positive refractive power has a convex imaging-side surface at the paraxial region and a concave image-source-side surface at the paraxial region, and at least one of the imaging-side surface and the image-source-side surface is aspheric;
the second lens element with negative refractive power has a concave image-source side surface at the paraxial region thereof, and at least one of the image-source side surface and the image-source side surface thereof is aspheric;
a third 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;
the first lens element has an optical axis thickness of CT1, the second lens element has an optical axis thickness of CT2, and the following conditions are satisfied: 3.15 ≦ CT1/CT2< 4.0.
2. The set of three-piece infrared wavelength projection lenses of claim 1, wherein the overall focal length of the set of three-piece infrared wavelength projection lenses is f, the combined focal length of the first and second lenses is f12, and the following conditions are satisfied: 0.4< f/f12< 1.2.
3. The set of three-piece infrared wavelength projection lenses of claim 1, wherein the overall focal length of the set of three-piece infrared wavelength projection lenses is f, and the combined focal length of the second lens and the third lens is f23, and the following conditions are satisfied: 0.6< f/f23< 1.8.
4. The set of three-piece infrared wavelength projection lenses of claim 1, wherein the first lens has a focal length of f1 and the second lens has a focal length of f2, and wherein the following conditions are satisfied: -3.0< f1/f2< -1.2.
5. The set of three-piece infrared wavelength projection lenses of claim 1, wherein the second lens has a focal length of f2 and the third lens has a focal length of f3, and the following conditions are satisfied: -1.3< f2/f3< -0.1.
6. The set of three-piece infrared wavelength projection lenses of claim 1, wherein the first lens has a focal length of f1 and the third lens has a focal length of f3, and wherein the following conditions are satisfied: 0.7< f1/f3< 1.8.
7. The set of three-piece infrared wavelength projection lenses of claim 1, wherein the first lens has a focal length of f1, and the combined focal length of the second and third lenses is f23, wherein the following conditions are satisfied: 0.1< f1/f23< 1.2.
8. The set of three-piece infrared wavelength projection lenses of claim 1, wherein the first and second lenses have a combined focal length of f12, and the third lens has a focal length of f3, and the following conditions are satisfied: 2.3< f12/f3< 4.4.
9. The set of three-piece infrared wavelength projection lenses of claim 1, wherein the first lens 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, and wherein the following conditions are satisfied: 0.01< R1/R2< 1.04.
10. The set of three-piece infrared wavelength projection lenses of claim 1, wherein the second lens 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, and wherein the following conditions are satisfied: -1.65< R3/R4< 13.5.
11. The set of three-piece infrared wavelength projection lenses of claim 1, wherein the third lens has an image-side surface with a radius of curvature of R5 and an image-source side surface with a radius of curvature of R6, and wherein the following conditions are satisfied: 1.6< R5/R6< 4.4.
12. The set of three-piece infrared wavelength projection lenses of claim 1, wherein the second lens element has an optical thickness CT2, and the third lens element has an optical thickness CT3, wherein the following conditions are satisfied: 0.05< CT2/CT3< 1.05.
13. The set of three-piece infrared wavelength projection lenses of claim 1, wherein the first lens element has an optical thickness CT1, and the third lens element has an optical thickness CT3, wherein the following conditions are satisfied: 0.6< CT1/CT3< 2.6.
14. The set of three-piece infrared wavelength projection lenses of claim 1, wherein the overall focal length of the set of three-piece infrared wavelength projection lenses is f, the distance from the image-side surface to the image-source surface of the first lens on the optical axis is TL, and the following conditions are satisfied: 0.7< f/TL < 1.9.
15. The set of three-piece infrared wavelength projection lenses of claim 1, wherein the refractive index of the first lens is n1, the refractive index of the second lens is n2, and the refractive index of the third lens is n3, and the following conditions are satisfied: 1.5< n1, n2, n3< 1.7.
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| KR101425791B1 (en) * | 2012-12-31 | 2014-08-14 | 주식회사 코렌 | Imaging lens system |
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