CN109782421B - Three-piece infrared single-wavelength projection lens set - Google Patents
Three-piece infrared single-wavelength projection lens set Download PDFInfo
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- CN109782421B CN109782421B CN201711119742.6A CN201711119742A CN109782421B CN 109782421 B CN109782421 B CN 109782421B CN 201711119742 A CN201711119742 A CN 201711119742A CN 109782421 B CN109782421 B CN 109782421B
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Abstract
The invention relates to a three-piece infrared single-wavelength projection lens group, which sequentially comprises the following components from an imaging side to an image source side: a first lens element with positive refractive power; a second lens element with negative refractive power; a third lens element with positive refractive power; 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 image source side surface of the second lens. Therefore, the three-piece infrared single-wavelength projection lens set with better image sensing function is achieved.
Description
Technical Field
The present invention relates to a projection lens set, and more particularly to a miniaturized three-piece infrared single-wavelength projection lens set applied to electronic products.
Background
Nowadays, digital imaging technology is continuously updated and changed, especially digital carriers of digital cameras and mobile phones are all miniaturized, and the photosensitive devices such as CCD or CMOS are also required to be miniaturized, and in addition to being applied to the field of photography, infrared focusing lens is also widely applied to the field of infrared reception and sensing of game machines in recent years, and in order to make the range of the game machines for sensing users wider, the current lens group for receiving infrared wavelengths 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 is mainly a 3D game with more stereoscopic, real and realistic feelings, so that the prior art or the lens sets previously proposed by the applicant both seek for 2D planar game detection, so that the effect of 3D game emphasis depth sensing 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 overheat or overcool the ambient temperature, so that the focal length of the lens set is changed and the accurate focusing detection cannot be performed, as mentioned above, the current infrared wavelength receiving lens set cannot meet the two technical problems of the accurate sensing of the depth distance of the 3D game.
Therefore, how to provide a lens assembly capable of accurately detecting and receiving depth distances and preventing the focal length of the lens assembly from changing to affect the depth detection effect is a technical bottleneck to be overcome by the infrared wavelength receiving lens assembly.
Disclosure of Invention
The present invention provides a three-piece infrared single-wavelength projection lens set, and more particularly, to a three-piece infrared single-wavelength projection lens set with better image sensing function.
Therefore, in order to achieve the above object, the present invention provides a three-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 thereof and at least one of the image-side surface and the image-source side surface thereof being aspheric; a second lens element with negative refractive power having a concave image-source side surface at a paraxial region thereof and at least one of an image-side surface and an image-source side surface thereof being aspheric. 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. 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 image source side surface of the second lens.
Preferably, wherein the overall focal length of the three-piece infrared single-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: 0.6< f/f12< 1.6. Therefore, through the proper configuration of the refractive power 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 single-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: 0.1< f/f23< 1.3. Therefore, the three-piece infrared single-wavelength projection lens set can balance between shortening the total optical length and correcting aberration.
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: -3.0< f1/f2< -1.7. Therefore, the refractive power configuration of the first lens element and the second lens element is more suitable, which is beneficial to reducing the excessive increase of system aberration.
Preferably, wherein the focal length of the second lens is f2, the focal length of the third lens is f3, and the following conditions are satisfied: -0.55< f2/f3< -0.15. 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, wherein the focal length of the first lens is f1, the focal length of the third lens is f3, and the following conditions are satisfied: 0.5< f1/f3< 1.3. Therefore, the positive refractive power of the first lens element is effectively distributed, and the sensitivity of the three-piece infrared single-wavelength projection lens assembly is reduced.
Preferably, wherein 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: 0.02< f1/f23< 0.46. Therefore, the resolution capability of the three-piece infrared single-wavelength projection lens set is remarkably improved.
Preferably, the 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: 1.34< f12/f3< 4.05. Therefore, the resolution capability of the three-piece infrared single-wavelength projection lens set is remarkably 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: -3.38< R1/R2< 0.45. Therefore, the spherical aberration and astigmatism of the three-piece infrared single-wavelength projection lens set are effectively reduced.
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: -1.87< R3/R4< 6.23. Therefore, the spherical aberration and astigmatism of the three-piece infrared single-wavelength projection lens set are effectively reduced.
Preferably, wherein the third lens has an image-side surface curvature radius of R5 and an image-source-side surface curvature radius of R6, and the following conditions are satisfied: 0.5< R5/R6< 3.2. Therefore, the spherical aberration and astigmatism of the three-piece infrared single-wavelength projection lens set are effectively reduced.
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: 0.8< CT1/CT2< 3.5. This contributes to the moldability and homogeneity of the lens.
Preferably, the thickness of the second lens element on the optical axis is CT2, the thickness of the third lens element on the optical axis is CT3, and the following conditions are satisfied: 0.1< CT2/CT3< 1.6. Thereby, a proper balance between imaging quality and sensitivity is obtained.
Preferably, the thickness of the first lens element on the optical axis is CT1, the thickness of the third lens element on the optical axis is CT3, and the following conditions are satisfied: 0.1< CT1/CT3< 1.1. This contributes to the moldability and homogeneity of the lens.
Preferably, the overall focal length of the three-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: 1.0< f/TL < 2.0. Therefore, the three-piece infrared single-wavelength projection lens set can be kept miniaturized and can be carried on light and thin electronic products.
Preferably, 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: n1, n2, n3 > 1.6. Therefore, the lens matching and blending of the whole three-piece infrared single-wavelength projection lens set are facilitated, and the optimal aberration balancing capability is provided.
To achieve the above objects, the present invention provides techniques, means and other effects, which are described in detail below with reference to the accompanying drawings.
Drawings
FIG. 1A is a schematic diagram of a three-piece infrared single-wavelength projection lens set according to a first embodiment of the present invention.
Fig. 1B is a non-point aberration-correcting and distortion aberration-correcting curve diagram of the three-piece infrared single-wavelength projection lens set according to the first embodiment in order from left to right.
FIG. 2A is a schematic diagram of a three-piece infrared single-wavelength projection lens set according to a second embodiment of the present invention.
Fig. 2B is a non-point aberration-correcting and distortion aberration-correcting curve diagram of the three-piece infrared single-wavelength projection lens set according to the second embodiment in order from left to right.
FIG. 3A is a schematic diagram of a three-piece infrared single-wavelength projection lens set according to a third embodiment of the present invention.
Fig. 3B is a non-point aberration-correcting and distortion aberration-correcting curve diagram of the three-piece infrared single-wavelength projection lens set according to the third embodiment in order from left to right.
FIG. 4A is a schematic diagram of a three-piece infrared single-wavelength projection lens set according to a fourth embodiment of the present invention.
Fig. 4B is a non-point aberration-correcting and distortion aberration-correcting curve diagram of the three-piece infrared single-wavelength projection lens set according to the fourth embodiment in order from left to right.
FIG. 5A is a schematic diagram of a three-piece infrared single-wavelength projection lens set according to a fifth embodiment of the present invention.
Fig. 5B is a graph of non-point aberration and distortion aberration curves of the three-piece infrared single-wavelength projection lens set according to the fourth embodiment in order from left to right.
Reference numerals indicate the same.
100. 200, 300, 400, 500: aperture
110. 210, 310, 410, 510: first lens
111. 211, 311, 411, 511: imaging side surface
112. 212, 312, 412, 512: side surface of image source
120. 220, 320, 420, 520: second lens
121. 221, 321, 421, 521: imaging side surface
122. 222, 322, 422, 522: side surface of image source
130. 230, 330, 430, 530: third lens
131. 231, 331, 431, 531: imaging side surface
132. 232, 332, 432, 532: side surface of image source
180. 280, 380, 480, 580: image source surface
190. 290, 390, 490, 590: optical axis
f: focal length of three-piece infrared single-wavelength projection lens group
Fno: aperture value of three-piece infrared single-wavelength projection lens set
FOV: maximum field angle in three-piece infrared single-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: the distance from the imaging side surface of the first lens to the image source surface on the optical axis.
Detailed Description
< first embodiment >
Referring to fig. 1A and fig. 1B, fig. 1A is a schematic diagram of a three-piece infrared single-wavelength projection lens set according to a first embodiment of the invention, and fig. 1B is a non-stippling and skew shading curve diagram of the three-piece infrared single-wavelength projection lens set of the first embodiment in order from left to right. As shown in fig. 1A, the three-piece infrared single-wavelength projection lens assembly includes an aperture stop 100 and an optical assembly, the optical assembly includes, in order from an image side to an image source side, a first lens element 110, a second lens element 120, a third lens element 130, and an image source surface 180, wherein the three-piece infrared single-wavelength projection lens assembly includes three lens elements with refractive power. The aperture stop 100 is disposed between an image-side surface 111 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 an imaging-side surface 111 being convex at a paraxial region 190 and an image-source side surface 112 being convex at a paraxial region 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 concave imaging-side surface 131 near the optical axis 190 and a convex image-source-side surface 132 near the optical axis 190, wherein 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, G, … … are high order aspheric coefficients.
In the first embodiment of the three-piece infrared single-wavelength projection lens set, the focal length of the three-piece infrared single-wavelength projection lens set is f, the aperture value (f-number) of the three-piece infrared single-wavelength projection lens set is Fno, and the maximum field angle (view angle) of the three-piece infrared single-wavelength projection lens set is FOV, which is as follows: f ═ 5.97 (millimeters); fno 2.6; and FOV 4.89 (degrees).
In the first embodiment of the three-piece infrared single-wavelength projection lens set, the overall focal length of the three-piece infrared single-wavelength projection lens set is f, and 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 1.429.
In the first embodiment of the three-piece infrared single-wavelength projection lens set, the overall focal length of the three-piece infrared single-wavelength projection lens set 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 0.512.
In the first embodiment of the three-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/f 2-2.088.
In the first embodiment of the three-piece infrared single-wavelength projection lens set, 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-0.383.
In the first embodiment of the three-piece infrared single-wavelength projection lens set, 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 is 0.8.
In the first embodiment of the three-piece infrared single-wavelength projection lens assembly, 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, and the following conditions are satisfied: f1/f23 is 0.175.
In the first embodiment of the three-piece infrared single-wavelength projection lens assembly, the combined focal length of the first lens element 110 and the second lens element 120 is f12, and the focal length of the third lens element 130 is f3, and the following conditions are satisfied: f12/f3 is 1.637.
In the first embodiment of the three-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 ═ 3.076.
In the first embodiment of the three-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 ═ 3.559.
In the first embodiment of the three-piece infrared single-wavelength projection lens set, 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 ═ 0.75.
In the first embodiment of the three-piece infrared single-wavelength projection lens assembly, 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 1.004.
In the first embodiment of the three-piece infrared single-wavelength projection lens set, 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/CT 3-1.354.
In the first embodiment of the three-piece infrared single-wavelength projection lens assembly, the thickness of the first lens element 110 along the optical axis 190 is CT1, the thickness of the third lens element 130 along the optical axis 190 is CT3, and the following conditions are satisfied: CT1/CT3 is 1.360.
In the first embodiment of the three-piece infrared single-wavelength projection lens assembly, the overall focal length of the three-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 1.637.
In the first embodiment of the three-piece infrared single-wavelength projection lens set, 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 1.65.
Further, refer to the following Table 1 and Table 2.
Table 1 shows the 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 the surfaces 0-9 sequentially represent the surfaces from the imaging 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 is not repeated herein.
< second embodiment >
Referring to fig. 2A and fig. 2B, fig. 2A is a schematic diagram of a three-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 three-piece infrared single-wavelength projection lens set of the second embodiment in order from left to right. As shown in fig. 2A, the three-piece infrared single-wavelength projection lens assembly includes an aperture stop 200 and an optical assembly, the optical assembly includes, in order from an image side to an image source side, a first lens element 210, a second lens element 220, a third lens element 230, and an image source surface 280, wherein the three-piece infrared single-wavelength projection lens assembly includes three lens elements with refractive power. The aperture stop 200 is disposed between an image source side surface 212 of the first lens 210 and an 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 convex image-source-side surface 212 at a 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, 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 in the same way as in the first embodiment and will not be described 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 three-piece infrared single-wavelength projection lens set according to a third embodiment of the invention, and fig. 3B is a non-stippling and skew curve-focusing graph of the three-piece infrared single-wavelength projection lens set of the third embodiment in order from left to right. As shown in fig. 3A, the three-piece infrared single-wavelength projection lens assembly includes an aperture stop 300 and an optical assembly, the optical assembly includes, in order from the image side to the image source side, a first lens element 310, a second lens element 320, a third lens element 330, and an image source surface 380, wherein the three-piece infrared single-wavelength projection lens assembly includes two lens elements with refractive power. The aperture stop 300 is disposed between an image side surface 311 and an 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 convex 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 concave imaging-side surface 321 at the 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.
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 in the same way as in the first embodiment and will not be described 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 three-piece infrared single-wavelength projection lens set according to a fourth embodiment of the invention, and fig. 4B is a graph of non-stippling and skew difference curves of the three-piece infrared single-wavelength projection lens set of the fourth embodiment in order from left to right. As shown in fig. 4A, the three-piece infrared single-wavelength projection lens assembly includes an aperture stop 400 and an optical assembly, the optical assembly includes, in order from an image side to an image source side, a first lens element 410, a second lens element 420, a third lens element 430, and an image source surface 480, wherein the three-piece infrared single-wavelength projection lens assembly includes three lens elements with refractive power. The aperture stop 400 is disposed between an image side surface 411 and an image source side surface 412 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 negative refractive power has a concave 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, 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 in the same way as in the first embodiment and will not be described 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 three-piece infrared single-wavelength projection lens set according to a fifth embodiment of the invention, and fig. 5B is a graph of non-stippling aberration and distortion aberration of the three-piece infrared single-wavelength projection lens set of the fifth embodiment in order from left to right. As shown in fig. 5A, the three-piece infrared single-wavelength projection lens assembly includes an aperture stop 500 and an optical assembly, the optical assembly includes, in order from the image side to the image source side, a first lens element 510, a second lens element 520, a third lens element 530, and an image source surface 580, wherein the three-piece infrared single-wavelength projection lens assembly includes three lens elements with refractive power. The aperture stop 500 is disposed between an image side surface 511 and an 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 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 521 and the image-source-side surface 522 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, 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 in the same way as in the first embodiment and will not be described herein.
The following data can be derived from tables 9 and 10:
in the three-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 three-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 three-piece infrared single-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 single-wavelength projection lens group can be effectively reduced.
In the three-piece infrared single-wavelength projection lens assembly provided by the present 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, it means that 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 understood that the above-mentioned embodiments and drawings are only preferred embodiments of the present invention, and are not intended to limit the scope of the invention, so that the present invention is not limited by the above-mentioned embodiments and drawings.
Claims (15)
1. A three-piece infrared single-wavelength projection lens set, in order from an image side to an image source side, comprises:
a first lens element with positive refractive power having a convex image-side surface at a paraxial region thereof and at least one of the image-side surface and the image-source side surface thereof being aspheric;
a second lens element with negative refractive power having a concave image-source side surface at a paraxial region thereof, wherein at least one of the image-source side surface and the image-source side surface is aspheric;
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, 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 source side surface of the second lens;
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< -1.7.
2. The three-piece infrared single wavelength projection lens set of claim 1 wherein the overall focal length of the three-piece infrared single wavelength projection lens set is f, the combined focal length of the first lens element and the second lens element is f12, and the following conditions are satisfied: 0.6< f/f12< 1.6.
3. The three-piece infrared single wavelength projection lens set of claim 1 wherein the overall focal length of the three-piece infrared single wavelength projection lens set is f, the combined focal length of the second lens element and the third lens element is f23, and the following conditions are satisfied: 0.1< f/f23< 1.3.
4. The set of three-piece infrared single 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, wherein the following conditions are satisfied: -0.55< f2/f3< -0.15.
5. The set of three-piece infrared single 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, wherein the following conditions are satisfied: 0.5< f1/f3< 1.3.
6. The set of three-piece infrared single wavelength projection lenses of claim 1, wherein the first lens has a focal length of f1, and the combined focal length of the second lens and the third lens is f23, wherein the following conditions are satisfied: 0.02< f1/f23< 0.46.
7. The set of three-piece infrared single wavelength projection lenses of claim 1, wherein 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: 1.34< f12/f3< 4.05.
8. The set of three-piece infrared single wavelength projection lenses 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: -3.38< R1/R2< 0.45.
9. The set of three-piece infrared single 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, wherein the following conditions are satisfied: -1.87< R3/R4< 6.23.
10. The set of three-piece infrared single wavelength projection lenses of claim 1, wherein the third lens element 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, wherein the following conditions are satisfied: 0.5< R5/R6< 3.2.
11. The set of three-piece infrared single wavelength projection lenses 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: 0.8< CT1/CT2< 3.5.
12. The set of three-piece infrared single 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: 0.1< CT2/CT3< 1.6.
13. The set of three-piece infrared single 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: 0.1< CT1/CT3< 1.1.
14. The three-piece infrared single-wavelength projection lens assembly of claim 1, wherein the overall focal length of the three-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: 1.0< f/TL < 2.0.
15. The set of three-piece infrared single 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, wherein the following conditions are satisfied: n1, n2, n3 > 1.6.
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| TWI680322B (en) * | 2018-11-27 | 2019-12-21 | 大立光電股份有限公司 | Lens system, projection apparatus, detecting module and electronic device |
| CN111273431B (en) * | 2018-12-04 | 2021-11-16 | 新巨科技股份有限公司 | Three-piece infrared wavelength projection lens set |
| CN112230381B (en) * | 2020-10-31 | 2022-01-07 | 诚瑞光学(苏州)有限公司 | Image pickup optical lens |
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