CN110632737A - Four-piece infrared single-wavelength lens group - Google Patents
Four-piece infrared single-wavelength lens group Download PDFInfo
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- CN110632737A CN110632737A CN201810659734.9A CN201810659734A CN110632737A CN 110632737 A CN110632737 A CN 110632737A CN 201810659734 A CN201810659734 A CN 201810659734A CN 110632737 A CN110632737 A CN 110632737A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/004—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Abstract
The invention discloses a four-piece infrared single-wavelength lens group, which comprises the following components in sequence from an object side to an image side: an aperture; a first lens element with refractive power having an object-side surface being convex at a paraxial region thereof; a second lens element with positive refractive power; a third lens element with positive refractive power having an object-side surface being concave at a paraxial region and an image-side surface being convex at a paraxial region; and a fourth lens element with negative refractive power having an object-side surface being convex at a paraxial region and an image-side surface being concave at a paraxial region. Therefore, the lens has the effects of improving the field angle, large aperture, short lens length and small distortion.
Description
Technical Field
The present invention relates to a lens assembly, and more particularly to a miniaturized four-piece infrared single-wavelength lens assembly applied to an electronic product.
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 the application of infrared focusing lens, besides the application in the field of photography, in recent years, the infrared receiving and sensing field of game machines is also greatly changed, and in order to make the range of the game machines sensing users wider, the current lens group receiving infrared wavelength mostly uses the wide-angle lens group with larger field angle as the main stream.
The applicant also previously proposed a plurality of lens sets related to infrared wavelength reception, and the current game machine mainly uses a 3D game with more stereoscopic, real and realistic feelings, so that the current or previous lens sets of the applicant both use 2D plane game detection as a appeal, 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 overheat or overcool at 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 satisfy two major technical problems of 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 four-piece infrared single-wavelength lens set, and more particularly, to a four-piece infrared single-wavelength lens set with improved field angle, large aperture, short lens length, and small distortion.
To achieve the above object, the present invention provides a four-piece infrared single-wavelength lens assembly, in order from an object side to an image side, comprising: an aperture; a first lens element with refractive power having an object-side surface being convex at a paraxial region thereof and at least one surface of the object-side surface and the image-side surface being aspheric; a second lens element with positive refractive power having an object-side surface and an image-side surface, at least one of which is aspheric; a third lens element with positive refractive power having an object-side surface being concave at a paraxial region thereof and an image-side surface being convex at a paraxial region thereof, wherein at least one of the object-side surface and the image-side surface thereof is aspheric; and a fourth lens element with negative refractive power having an object-side surface being convex at a paraxial region and an image-side surface being concave at a paraxial region, wherein at least one of the object-side surface and the image-side surface is aspheric.
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: -45< f1/f2< 10. Therefore, the refractive power configurations of the first lens element and the second lens element are suitable, which is beneficial to obtaining a wide field angle and reducing excessive increase of 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: 0.3< f2/f3< 18. Therefore, the peripheral resolution and illumination of the system can be improved.
Preferably, the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the following conditions are satisfied: -1.7< f3/f4< -0.1. Therefore, the refractive power configuration of the system can be effectively balanced, and the sensitivity is reduced to improve the manufacturing yield.
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: -55< f1/f3< 10. Therefore, the positive refractive power of the first lens element is effectively distributed, and the sensitivity of the four-piece infrared single-wavelength lens assembly is reduced.
Preferably, the focal length of the first lens is f1, the focal length of the fourth lens is f4, and the following conditions are satisfied: -1.6< f1/f4< 20. Therefore, the positive refractive power of the first lens element is effectively distributed, and the sensitivity of the four-piece infrared single-wavelength lens assembly is reduced.
Preferably, the focal length of the second lens is f2, the focal length of the fourth lens is f4, and the following conditions are satisfied: -17< f2/f4< -0.1. Therefore, the positive refractive power distribution of the system is more appropriate, and the system aberration can be corrected to improve the imaging quality of the system.
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: -80< f1/f23< 15. Therefore, when f1/f23 satisfies the above condition, the four-piece infrared single-wavelength lens set can obtain a wide field angle and the resolution capability thereof is significantly 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: 0.05< f12/f3< 1.8. This is advantageous in that a wide field angle can be obtained and the field curvature can be effectively corrected.
Preferably, a focal length of the first lens and the second lens is f12, a focal length of the fourth lens is f4, and the following conditions are satisfied: -1< f12/f4< -0.05. This is advantageous in that a wide field angle can be obtained and the field curvature can be effectively corrected.
Preferably, a combined focal length of the first lens element and the second lens element is f12, a combined focal length of the third lens element and the fourth lens element is f34, and the following conditions are satisfied: -0.15< f12/f34< 1.4. This is advantageous in that a wide field angle can be obtained and the field curvature can be effectively corrected.
Preferably, the focal length of the second lens element is f2, the combined focal length of the third lens element and the fourth lens element is f34, and the following conditions are satisfied: -0.4< f2/f34< 2.7. This is advantageous in that a wide field angle can be obtained and the field curvature can be effectively corrected.
Preferably, a focal length of the second lens element and the third lens element is f23, a focal length of the fourth lens element is f4, and the following conditions are satisfied: -1.0< f23/f4< -0.05. This is advantageous in that a wide field angle can be obtained and the field curvature can be effectively corrected.
Preferably, the focal length of the first lens element is f1, the combined focal length of the second lens element, the third lens element and the fourth lens element is f234, and the following conditions are satisfied: -75< f1/f234< 15. Thus, a wide field angle can be obtained and the field curvature can be effectively corrected.
Preferably, a focal length of the first lens element, the second lens element and the third lens element is f123, a focal length of the fourth lens element is f4, and the following conditions are satisfied: -0.7< f123/f4< -0.05. Thus, a wide field angle can be obtained and the field curvature can be effectively corrected.
Preferably, the refractive index of the fourth lens is N4, the abbe number of the fourth lens is V4, and the following conditions are satisfied: 1.61< N4; v4< 25. Therefore, the transmittance of the whole four-piece infrared single-wavelength lens group is facilitated, and the absorption rate of the lens group to the infrared single wavelength is reduced.
Preferably, the aperture value of the four-piece infrared single-wavelength lens set is Fno, and the following conditions are satisfied: 1.2< Fno, whereby the imaging plane can be made to have sufficient and appropriate illuminance.
Preferably, the overall focal length of the four-piece infrared single-wavelength lens set is f, the distance between the object-side surface of the first lens element and the image plane on the optical axis is TL, and the following conditions are satisfied: 0.5< f/TL < 0.9. Therefore, the four-piece infrared single-wavelength lens group can be favorably kept small and long in focus so as to be carried on light and thin electronic products.
To achieve the above objects, the present invention provides a method, a device and a system for implementing the method, which are capable of implementing six preferred embodiments and are described in detail below with reference to the accompanying drawings.
Drawings
Fig. 1A is a schematic view of a four-piece infrared single-wavelength lens set according to a first embodiment of the invention.
Fig. 1B is a graph sequentially showing the curvature of field and the distortion of the image plane of the four-piece infrared single-wavelength lens assembly of the first embodiment from left to right.
Fig. 2A is a schematic view of a four-piece infrared single-wavelength lens set according to a second embodiment of the invention.
Fig. 2B is a graph sequentially showing the curvature of field and the distortion of the image plane of the four-piece infrared single-wavelength lens assembly of the second embodiment from left to right.
Fig. 3A is a schematic view of a four-piece infrared single-wavelength lens set according to a third embodiment of the invention.
Fig. 3B is a graph sequentially showing the curvature of field and the distortion of the four-piece infrared single-wavelength lens assembly of the third embodiment from left to right.
Fig. 4A is a schematic view of a four-piece infrared single-wavelength lens set according to a fourth embodiment of the invention.
Fig. 4B is a graph sequentially showing the curvature of field and the distortion of the four-piece infrared single-wavelength lens assembly of the fourth embodiment from left to right.
Fig. 5A is a schematic view of a four-piece infrared single-wavelength lens set according to a fifth embodiment of the invention.
Fig. 5B is a graph sequentially showing the curvature of field and distortion aberration of the four-piece infrared single-wavelength lens assembly of the fifth embodiment from left to right.
Fig. 6A is a schematic view of a four-piece infrared single-wavelength lens assembly according to a sixth embodiment of the invention.
Fig. 6B is a graph sequentially showing the curvature of field and distortion aberration of the four-piece infrared single-wavelength lens assembly of 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: object side surface
112. 212, 312, 412, 512, 612: surface of image side
120. 220, 320, 420, 520, 620: second lens
121. 221, 321, 421, 521, 621: object side surface
122. 222, 322, 422, 522, 622: surface of image side
130. 230, 330, 430, 530, 630: third lens
131. 231, 331, 431, 531, 631: object side surface
132. 232, 332, 432, 532, 632: surface of image side
140. 240, 340, 440, 540, 640: fourth lens
141. 241, 341, 441, 541, 641: object side surface
142. 242, 342, 442, 542, 642: surface of image side
170. 270, 370, 470, 570, 670: infrared filtering filter
180. 280, 380, 480, 580, 680: image plane
190. 290, 390, 490, 590, 690: optical axis
f: focal length of four-piece infrared single-wavelength lens group
Fno: aperture value of four-piece infrared single-wavelength lens group
FOV: maximum field angle in four-piece infrared single-wavelength 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 4: focal length of the fourth 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
f 34: the combined focal length of the third lens and the fourth lens
f 123: the combined focal length of the first lens, the second lens and the third lens
f 234: the combined focal length of the second lens, the third lens and the fourth lens
TL: the distance from the object side surface of the first lens element to the image plane on the optical axis
Detailed Description
< first embodiment >
Referring to fig. 1A and fig. 1B, fig. 1A is a schematic diagram of a four-piece infrared single-wavelength lens assembly according to a first embodiment of the disclosure, and fig. 1B is a graph sequentially showing an image plane curvature and a distortion tolerance curve of the four-piece infrared single-wavelength lens assembly of the first embodiment from left to right. As shown in fig. 1A, the four-piece infrared single-wavelength lens assembly includes an aperture stop 100 and an optical assembly, which includes, in order from an object side to an image side, a first lens element 110, a second lens element 120, a third lens element 130, a fourth lens element 140, an ir-cut filter 170, and an image plane 180, wherein the four-piece infrared single-wavelength lens assembly includes four lens elements with refractive power. The aperture stop 100 is disposed in front of the first lens 110.
The first lens element 110 with positive refractive power has an object-side surface 111 being convex at a paraxial region 190 and an image-side surface 112 being concave at a paraxial region 190, and the object-side surface 111 and the image-side surface 112 are aspheric.
The second lens element 120 with positive refractive power has an object-side surface 121 being convex in a paraxial region 190 and an image-side surface 122 being concave in a paraxial region 190, and the object-side surface 121 and the image-side surface 122 are aspheric.
The third lens element 130 with positive refractive power has an object-side surface 131 being concave at a paraxial region 190 and an image-side surface 132 being convex at a paraxial region 190, wherein the third lens element 130 is made of plastic material, and both the object-side surface 131 and the image-side surface 132 are aspheric.
The fourth lens element 140 with negative refractive power has an object-side surface 141 being convex at a paraxial region 190 and an image-side surface 142 being concave at a paraxial region 190, wherein the object-side surface 141 and the image-side surface 142 are aspheric and at least one of the object-side surface 141 and the image-side surface 142 has at least one inflection point.
The ir-cut filter 170 is made of glass, and is disposed between the fourth lens element 140 and the image plane 180 without affecting the focal length of the four-piece ir single-wavelength lens assembly.
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 four-piece infrared single-wavelength lens group of the first embodiment, the focal length of the four-piece infrared single-wavelength lens group is f, the aperture value (f-number) of the four-piece infrared single-wavelength lens group is Fno, and the maximum field angle in the four-piece infrared single-wavelength lens group is FOV, which has the following values: f 2.08 (mm); fno 1.11; and FOV 75.3 (degrees).
In the four-piece infrared single-wavelength lens assembly of the first embodiment, 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 1.95.
In the four-piece infrared single-wavelength lens assembly of the first embodiment, 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 equals 2.00.
In the four-piece infrared single-wavelength lens assembly of the first embodiment, the focal length of the third lens element 130 is f3, the focal length of the fourth lens element 140 is f4, and the following conditions are satisfied: f3/f4 is-0.49.
In the four-piece infrared single-wavelength lens assembly of the first embodiment, 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 3.89.
In the four-piece infrared single-wavelength lens assembly of the first embodiment, the focal length of the first lens element 110 is f1, the focal length of the fourth lens element 140 is f4, and the following conditions are satisfied: f1/f4 is-1.91.
In the four-piece infrared single-wavelength lens assembly of the first embodiment, the focal length of the second lens element 120 is f2, the focal length of the fourth lens element 140 is f4, and the following conditions are satisfied: f2/f4 is-0.98.
In the four-piece infrared single-wavelength lens assembly of the first embodiment, 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 4.93.
In the four-piece infrared single-wavelength lens assembly of the first embodiment, a combined focal length of the first lens element 110 and the second lens element 120 is f12, a focal length of the third lens element 130 is f3, and the following conditions are satisfied: f12/f3 is 1.41.
In the four-piece infrared single-wavelength lens assembly of the first embodiment, a combined focal length of the first lens element 110 and the second lens element 120 is f12, a focal length of the fourth lens element 140 is f4, and the following conditions are satisfied: f12/f4 is-0.69.
In the first embodiment of the four-piece infrared single-wavelength lens assembly, a combined focal length of the first lens element 110 and the second lens element 120 is f12, a combined focal length of the third lens element 130 and the fourth lens element 140 is f34, and the following conditions are satisfied: f12/f34 is 0.91.
In the four-piece infrared single-wavelength lens assembly of the first embodiment, the focal length of the first lens element 110 is f2, the combined focal length of the third lens element 130 and the fourth lens element 140 is f34, and the following conditions are satisfied: f2/f34 is 1.29.
In the four-piece infrared single-wavelength lens assembly of the first embodiment, a combined focal length of the second lens element 120 and the third lens element 130 is f23, a focal length of the fourth lens element 140 is f4, and the following conditions are satisfied: f23/f4 is-0.39.
In the four-piece infrared single-wavelength lens assembly of the first embodiment, the focal length of the first lens element 110 is f1, and the combined focal length of the second lens element 120, the third lens element 130 and the fourth lens element 140 is f234, and the following conditions are satisfied: f1/f234 is 4.13.
In the four-piece infrared single-wavelength lens assembly of the first embodiment, a combined focal length of the first lens element 110, the second lens element 120 and the third lens element 130 is f123, a focal length of the fourth lens element 140 is f4, and the following conditions are satisfied: f123/f4 ═ 0.38.
In the first embodiment of the four-piece infrared single-wavelength lens assembly, the overall focal length of the four-piece infrared single-wavelength lens assembly is f, the distance from the object-side surface 111 of the first lens element 110 to the image plane 180 on the optical axis 190 is TL, and the following conditions are satisfied: f/TL is 0.69.
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 units of the radius of curvature, the thickness and the focal length are mm, and surfaces 0-13 sequentially represent the surfaces from the object side to the image 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, G, H … … 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 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 four-piece infrared single-wavelength lens assembly according to a second embodiment of the disclosure, and fig. 2B is a graph sequentially showing an image plane curvature and a distortion tolerance of the four-piece infrared single-wavelength lens assembly of the second embodiment from left to right. In fig. 2A, the four-piece infrared single-wavelength lens assembly includes an aperture stop 200 and an optical assembly including, in order from an object side to an image side, a first lens element 210, a second lens element 220, a third lens element 230, a fourth lens element 240, an ir-cut filter 270 and an image plane 280, wherein the four-piece infrared single-wavelength lens assembly includes four lens elements with refractive power. The aperture stop 200 is disposed in front of the first lens 210.
The first lens element 210 with negative refractive power has an object-side surface 211 being convex at a paraxial region 290 and an image-side surface 212 being concave at a paraxial region 290, and the object-side surface 211 and the image-side surface 212 are aspheric.
The second lens element 220 with positive refractive power has an object-side surface 221 being convex at a paraxial region 290 and an image-side surface 222 being concave at a paraxial region 290, and the object-side surface 221 and the image-side surface 222 are aspheric.
The third lens element 230 with positive refractive power has an object-side surface 231 being concave at a paraxial region 290 and an image-side surface 232 being convex at a paraxial region 290, and is made of plastic material, wherein the object-side surface 231 and the image-side surface 232 are aspheric.
The fourth lens element 240 with negative refractive power has an object-side surface 241 being convex at a paraxial region 290 and an image-side surface 242 being concave at a paraxial region 290, wherein the object-side surface 241 and the image-side surface 242 are aspheric and at least one of the object-side surface 241 and the image-side surface 242 has at least one inflection point.
The ir-cut filter 270 is made of glass, and is disposed between the fourth lens element 240 and the image plane 280 without affecting the focal length of the four-piece ir single-wavelength lens assembly.
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 four-piece infrared single-wavelength lens assembly according to a third embodiment of the disclosure, and fig. 3B is a graph sequentially showing an image plane curvature and a distortion tolerance curve of the four-piece infrared single-wavelength lens assembly of the third embodiment from left to right. In fig. 3A, the four-piece infrared single-wavelength lens assembly includes an aperture stop 300 and an optical assembly including, in order from an object side to an image side, a first lens element 310, a second lens element 320, a third lens element 330, a fourth lens element 340, an ir-cut filter 370 and an image plane 380, wherein the four-piece infrared single-wavelength lens assembly includes four lens elements with refractive power. The aperture stop 300 is disposed in front of the first lens 310.
The first lens element 310 with positive refractive power has an object-side surface 311 being convex at a paraxial region 390, and an image-side surface 312 being concave at a paraxial region 390, wherein the object-side surface 311 and the image-side surface 312 are aspheric.
The second lens element 320 with positive refractive power has an object-side surface 321 being convex at a paraxial region 390 and an image-side surface 322 being concave at a paraxial region 390, and the object-side surface 321 and the image-side surface 322 are aspheric.
The third lens element 330 with positive refractive power has an object-side surface 331 being concave at a paraxial region 390 thereof and an image-side surface 332 being convex at a paraxial region 390 thereof, wherein the object-side surface 331 and the image-side surface 332 are aspheric.
The fourth lens element 340 with negative refractive power is made of plastic material, and has an object-side surface 341 being convex in a position close to the optical axis 390, and an image-side surface 342 being concave in a position close to the optical axis 390, wherein the object-side surface 341 and the image-side surface 342 are both aspheric, and at least one of the object-side surface 341 and the image-side surface 342 has at least one inflection point.
The ir-cut filter 370 is made of glass and disposed between the fourth lens element 340 and the image plane 380 without affecting the focal length of the four-piece ir single-wavelength lens assembly.
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 four-piece infrared single-wavelength lens assembly according to a fourth embodiment of the disclosure, and fig. 4B is a graph sequentially showing an image plane curvature and a distortion tolerance of the four-piece infrared single-wavelength lens assembly of the fourth embodiment from left to right. In fig. 4A, the four-piece infrared single-wavelength lens assembly includes an aperture stop 400 and an optical assembly including, in order from an object side to an image side, a first lens element 410, a second lens element 420, a third lens element 430, a fourth lens element 440, an ir-cut filter 470 and an image plane 480, wherein the four-piece infrared single-wavelength lens assembly includes four lens elements with refractive power. The aperture stop 400 is disposed before the first lens 410.
The first lens element 410 with positive refractive power has an object-side surface 411 being convex at a paraxial region 490 thereof and an image-side surface 412 being convex at a paraxial region 490 thereof, and the object-side surface 411 and the image-side surface 412 are aspheric.
The second lens element 420 with positive refractive power has an object-side surface 421 being concave at a paraxial region 490 thereof and an image-side surface 422 being convex at a paraxial region 490 thereof, wherein the object-side surface 421 and the image-side surface 422 are aspheric.
The third lens element 430 with positive refractive power has an object-side surface 431 being concave at a paraxial region 490 thereof and an image-side surface 432 being convex at a paraxial region 490 thereof, and the object-side surface 431 and the image-side surface 432 are aspheric.
The fourth lens element 440 with negative refractive power has an object-side surface 441 being convex at a paraxial region 490 thereof and an image-side surface 442 being concave at a paraxial region 490 thereof, wherein the object-side surface 441 and the image-side surface 442 are aspheric and at least one of the object-side surface 441 and the image-side surface 442 has at least one inflection point.
The ir-cut filter 470 is made of glass, and is disposed between the fourth lens element 440 and the image plane 480 without affecting the focal length of the four-piece ir single-wavelength lens assembly.
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 four-piece infrared single-wavelength lens assembly according to a fifth embodiment of the disclosure, and fig. 5B is a graph sequentially showing an image plane curvature and a distortion tolerance of the four-piece infrared single-wavelength lens assembly of the fifth embodiment from left to right. In fig. 5A, the four-piece infrared single-wavelength lens assembly includes an aperture stop 500 and an optical assembly including, in order from an object side to an image side, a first lens element 510, a second lens element 520, a third lens element 530, a fourth lens element 540, an ir-cut filter 570 and an image plane 580, wherein the four-piece infrared single-wavelength lens assembly includes four lens elements with refractive power. The aperture 500 is disposed in front of the first lens 510.
The first lens element 510 with positive refractive power has an object-side surface 511 being convex in a paraxial region 590, an image-side surface 512 being concave in a paraxial region 590, and both the object-side surface 511 and the image-side surface 512 being aspheric.
The second lens element 520 with positive refractive power has an object-side surface 521 being concave in a paraxial region 590, and an image-side surface 522 being convex in a paraxial region 590, and the object-side surface 521 and the image-side surface 522 are aspheric.
The third lens element 530 with positive refractive power has an object-side surface 531 being concave at a paraxial region 590 and an image-side surface 532 being convex at a paraxial region 590, and both the object-side surface 531 and the image-side surface 532 are aspheric.
The fourth lens element 540 with negative refractive power has an object-side surface 541 being convex in a paraxial region 590 and an image-side surface 542 being concave in a paraxial region 590, and the object-side surface 541 and the image-side surface 542 are aspheric, and at least one of the object-side surface 541 and the image-side surface 542 has at least one inflection point.
The ir-cut filter 570 is made of glass, and is disposed between the fourth lens element 540 and the image plane 580 without affecting the focal length of the four-piece ir single-wavelength lens assembly.
Further, the following table 9 and table 10 are referred to.
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:
< sixth embodiment >
Referring to fig. 6A and 6B, fig. 6A is a schematic diagram illustrating a four-piece infrared single-wavelength lens assembly according to a sixth embodiment of the invention, and fig. 6B is a graph sequentially showing an image plane curvature and a distortion tolerance curve of the four-piece infrared single-wavelength lens assembly of the sixth embodiment from left to right. In fig. 6A, the four-piece infrared single-wavelength lens assembly includes an aperture stop 600 and an optical assembly including, in order from an object side to an image side, a first lens element 610, a second lens element 620, a third lens element 630, a fourth lens element 640, an ir-cut filter 670 and an image plane 680, wherein the four-piece infrared single-wavelength lens assembly includes four lens elements with refractive power. The aperture 600 is disposed in front of the first lens 610.
The first lens element 610 with positive refractive power has an object-side surface 611 being convex at a paraxial region 690 and an image-side surface 612 being concave at a paraxial region 690, and is made of plastic material, wherein the object-side surface 611 and the image-side surface 612 are aspheric.
The second lens element 620 with positive refractive power has an object-side surface 621 being concave in a paraxial region 690 thereof and an image-side surface 622 being convex in a paraxial region 690 thereof, and is made of plastic material, wherein the object-side surface 621 and the image-side surface 622 are aspheric.
The third lens element 630 with positive refractive power has an object-side surface 631 being concave at a paraxial region 690 and an image-side surface 632 being convex at a paraxial region 690, and the object-side surface 631 and the image-side surface 632 are aspheric.
The fourth lens element 640 with negative refractive power is made of plastic material, and has an object-side surface 641 being convex in a paraxial region 690 and an image-side surface 642 being concave in a paraxial region 690, wherein the object-side surface 641 and the image-side surface 642 are aspheric, and at least one of the object-side surface 641 and the image-side surface 642 has at least one inflection point.
The ir-cut filter 670 is made of glass, and is disposed between the fourth lens element 640 and the image plane 680 without affecting the focal length of the four-piece ir single-wavelength lens assembly.
Further, the following table 11 and table 12 are referred to.
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 four-piece infrared single-wavelength lens group 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 the configuration of the refractive power of the four-piece infrared single-wavelength lens group can be increased. In addition, the object-side surface and the image-side surface of the lenses in the four-piece infrared single-wavelength lens group can be aspheric surfaces, the aspheric surfaces can be easily made into shapes other than spherical surfaces, more control variables are obtained for reducing the aberration, and the number of the lenses is further reduced, so that the total length of the four-piece infrared single-wavelength lens group can be effectively reduced.
In the four-piece infrared single-wavelength lens assembly provided by the present invention, regarding the lens with refractive power, if the lens surface is convex and the position of the convex is not defined, it means that the lens surface is convex at the 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.
The four-piece infrared single-wavelength lens group provided by the invention can be applied to an optical system for moving focusing according to requirements, has the characteristics of excellent aberration correction and good imaging quality, and can be applied to electronic image systems such as 3D (three-dimensional) image acquisition, digital cameras, mobile devices, digital drawing boards or vehicle photography and the like in many aspects.
In summary, the above embodiments and drawings are only preferred embodiments of the present invention, and the scope of the present invention should not be limited thereby, and all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the present invention.
Claims (18)
1. A four-piece infrared single-wavelength lens assembly, in order from an object side to an image side, comprises:
an aperture;
a first lens element with refractive power having an object-side surface being convex at a paraxial region thereof and at least one surface of the object-side surface and the image-side surface being aspheric;
a second lens element with positive refractive power having an object-side surface and an image-side surface, at least one of which is aspheric;
a third lens element with positive refractive power having an object-side surface being concave at a paraxial region thereof and an image-side surface being convex at a paraxial region thereof, wherein at least one of the object-side surface and the image-side surface thereof is aspheric; and
the fourth lens element with negative refractive power has an object-side surface being convex at a paraxial region and an image-side surface being concave at a paraxial region, and at least one of the object-side surface and the image-side surface is aspheric.
2. The set of four-piece infrared single wavelength lens of claim 1, wherein the first lens element has a focal length of f1 and the second lens element has a focal length of f2, wherein the following conditions are satisfied: -45< f1/f2< 10.
3. The set of four-piece infrared single wavelength lens of claim 1, wherein the second lens element has a focal length of f2 and the third lens element has a focal length of f3, wherein the following conditions are satisfied: 0.3< f2/f3< 18.
4. The set of four-piece infrared single wavelength lens of claim 1, wherein the third lens element has a focal length of f3 and the fourth lens element has a focal length of f4, wherein the following conditions are satisfied: -1.7< f3/f4< -0.1.
5. The set of four-piece infrared single wavelength lens of claim 1, wherein the first lens element has a focal length of f1 and the third lens element has a focal length of f3, wherein the following conditions are satisfied: -55< f1/f3< 10.
6. The set of four-piece infrared single wavelength lens of claim 1, wherein the first lens element has a focal length of f1 and the fourth lens element has a focal length of f4, wherein the following conditions are satisfied: -1.6< f1/f4< 20.
7. The set of four-piece infrared single wavelength lens of claim 1, wherein the second lens element has a focal length of f2 and the fourth lens element has a focal length of f4, wherein the following conditions are satisfied: -17< f2/f4< -0.1.
8. The set of four-piece infrared single-wavelength lens of claim 1, wherein the first lens element has a focal length f1, and the combined focal length of the second lens element and the third lens element is f23, wherein the following conditions are satisfied: -80< f1/f23< 15.
9. The set of four-piece infrared single-wavelength lens of claim 1, wherein the combined focal length of the first lens element and the second lens element is f12, and the focal length of the third lens element is f3, and the following conditions are satisfied: 0.05< f12/f3< 1.8.
10. The set of four-piece infrared single-wavelength lens of claim 1, wherein the combined focal length of the first lens element and the second lens element is f12, and the focal length of the fourth lens element is f4, and the following conditions are satisfied: -1< f12/f4< -0.05.
11. The set of four-piece infrared single-wavelength lens of claim 1, wherein the combined focal length of the first lens element and the second lens element is f12, and the combined focal length of the third lens element and the fourth lens element is f34, wherein the following conditions are satisfied: -0.15< f12/f34< 1.4.
12. The set of four-piece infrared single-wavelength lens of claim 1, wherein the second lens element has a focal length f2, and the combined focal length of the third lens element and the fourth lens element is f34, wherein the following conditions are satisfied: -0.4< f2/f34< 2.7.
13. The set of four-piece infrared single-wavelength lens of claim 1, wherein the combined focal length of the second lens element and the third lens element is f23, the focal length of the fourth lens element is f4, and the following conditions are satisfied: -1.0< f23/f4< -0.05.
14. The set of four-piece infrared single wavelength lens of claim 1, wherein the first lens element has a focal length f1, and the combined focal length of the second, third and fourth lens elements is f234, and satisfies the following condition: -75< f1/f234< 15.
15. The set of four-piece infrared single wavelength lens of claim 1, wherein the combined focal length of the first lens element, the second lens element and the third lens element is f123, and the focal length of the fourth lens element is f4, and the following conditions are satisfied: -0.7< f123/f4< -0.05.
16. The set of four-piece infrared single-wavelength lens of claim 1, wherein the refractive index of the fourth lens element is N4, the abbe number of the fourth lens element is V4, and the following conditions are satisfied: 1.61< N4; v4< 25.
17. The set of four-piece infrared single wavelength lens of claim 1, wherein the aperture value of the set of four-piece infrared single wavelength lens is Fno, and the following condition is satisfied: 1.2< Fno.
18. The four-piece infrared single-wavelength lens assembly of claim 1, wherein the overall focal length of the four-piece infrared single-wavelength lens assembly is f, the distance from the object-side surface of the first lens element to the image plane is TL, and the following conditions are satisfied: 0.5< f/TL < 0.9.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021138760A1 (en) * | 2020-01-06 | 2021-07-15 | 南昌欧菲精密光学制品有限公司 | Optical imaging system and image capturing device having same, and electronic device |
| CN113671665A (en) * | 2020-05-15 | 2021-11-19 | 新巨科技股份有限公司 | Four-piece infrared single-wavelength lens group |
| CN114815146A (en) * | 2022-03-10 | 2022-07-29 | 支付宝(杭州)信息技术有限公司 | Optical system, image capturing module, electronic equipment and carrier |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TW201433816A (en) * | 2013-12-30 | 2014-09-01 | 玉晶光電股份有限公司 | Optical imaging lens and electronic device using the optical imaging lens |
| CN107884915A (en) * | 2016-09-30 | 2018-04-06 | 新巨科技股份有限公司 | The infrared Single wavelength lens set of four-piece type |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201433816A (en) * | 2013-12-30 | 2014-09-01 | 玉晶光電股份有限公司 | Optical imaging lens and electronic device using the optical imaging lens |
| CN107884915A (en) * | 2016-09-30 | 2018-04-06 | 新巨科技股份有限公司 | The infrared Single wavelength lens set of four-piece type |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021138760A1 (en) * | 2020-01-06 | 2021-07-15 | 南昌欧菲精密光学制品有限公司 | Optical imaging system and image capturing device having same, and electronic device |
| CN113671665A (en) * | 2020-05-15 | 2021-11-19 | 新巨科技股份有限公司 | Four-piece infrared single-wavelength lens group |
| CN113671665B (en) * | 2020-05-15 | 2022-10-21 | 新巨科技股份有限公司 | Four-piece infrared single-wavelength lens group |
| CN114815146A (en) * | 2022-03-10 | 2022-07-29 | 支付宝(杭州)信息技术有限公司 | Optical system, image capturing module, electronic equipment and carrier |
| CN114815146B (en) * | 2022-03-10 | 2024-03-01 | 支付宝(杭州)信息技术有限公司 | Optical system, image capturing module, electronic device and carrier |
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