CN113031210A - Four-piece type optical imaging lens group - Google Patents
Four-piece type optical imaging lens group Download PDFInfo
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- CN113031210A CN113031210A CN201911357044.9A CN201911357044A CN113031210A CN 113031210 A CN113031210 A CN 113031210A CN 201911357044 A CN201911357044 A CN 201911357044A CN 113031210 A CN113031210 A CN 113031210A
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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
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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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Abstract
The invention is a four-piece optical imaging lens group, in order from an object side to an image side comprising: an aperture; 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 a fourth lens element with negative refractive power; 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: 0.6< f12/f3< 1.6. Therefore, the invention provides the four-piece optical imaging lens group which can be applied to the portable electronic product, can not cause the total length of the lens to be overlong, has long focal length, high pixels and low lens height, and can obviously improve the resolution capability of the four-piece optical imaging lens group.
Description
Technical Field
The present invention relates to a four-piece optical imaging lens assembly, and more particularly to a miniaturized four-piece optical imaging lens assembly applied to an electronic product.
Background
With the advance of semiconductor manufacturing, the pixel area on the electronic photosensitive device is becoming smaller, and the camera lens needs to have finer resolution to display finer image quality.
The miniaturized photographing lens generally mounted on a portable electronic product mostly adopts a four-piece lens structure, but as electronic products such as mobile phone cameras and the like continuously develop towards lightness, thinness, high performance and high pixel, the pixel area of a photosensitive component is gradually reduced, and under the condition that the requirement of system imaging quality is continuously improved, the existing four-piece lens group cannot meet the requirement of higher-order photographing lens modules.
Therefore, it is an motivation for the present invention to develop an imaging lens assembly that can solve the above-mentioned drawbacks.
Disclosure of Invention
The present invention provides a four-piece optical imaging lens assembly, and more particularly, to a four-piece optical imaging lens assembly that can be applied to a portable electronic product, and has a long focal length, high pixels, and a low lens height without causing an overlong total lens length.
To achieve the above objective, the present invention provides a four-piece optical imaging lens assembly, which comprises an aperture stop and an optical assembly consisting of four lens elements, in order from an object side to an image side: the aperture; the first lens element with positive refractive power has an object-side surface being convex at a paraxial region thereof and an image-side surface being concave at a paraxial region thereof, and at least one of the object-side surface and the image-side surface of the first lens element is aspheric; the second lens element with negative refractive power has an object-side surface being concave at a paraxial region thereof and an image-side surface being concave at a paraxial region thereof, and at least one of the object-side surface and the image-side surface of the second lens element is aspheric; the third lens element with positive refractive power has an object-side surface being concave at a paraxial region thereof and an image-side surface being convex at a paraxial region thereof, and at least one of the object-side surface and the image-side surface of the third lens element is aspheric; the fourth lens element with negative refractive power has a concave image-side surface at a paraxial region thereof, at least one of an object-side surface and the image-side surface of the fourth lens element is aspheric, and at least one of the object-side surface and the image-side surface of the fourth lens element has an inflection point;
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: 0.6< f12/f3< 1.6. Therefore, the resolution capability of the four-piece optical imaging lens group can be improved remarkably.
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: 0.4< f1/f3< 1.2. Therefore, the sensitivity and the aberration generation of the four-piece optical imaging lens group can be 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: -1.5< f1/f4< -0.7. Therefore, the positive refractive power of the first lens element is effectively distributed, and the sensitivity of the four-piece optical imaging lens assembly is reduced.
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: -3.2< f2/f3< -1.7. Therefore, the aberration of the four-piece optical imaging lens group is corrected.
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: 2.7< f2/f4< 4.1. Therefore, the refractive power configuration of the optical system is balanced, and the sensitivity of the four-piece optical imaging lens group to tolerance 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: 0.2< f1/f23< 1.1. Therefore, the resolving power of the four-piece optical imaging lens group can be remarkably improved.
Preferably, a combined focal length of the first lens and the second lens is f12, a combined focal length of the fourth lens is f4, and the following conditions are satisfied: -2.0< f12/f4< -1.0. Thus, the field curvature is effectively corrected.
Preferably, a radius of curvature of an object-side surface of the third lens is R5, a radius of curvature of an image-side surface of the third lens is R6, and the following condition is satisfied: 1.5< R5/R6< 2.7. Therefore, the spherical aberration and astigmatism of the four-piece optical imaging lens group are effectively reduced.
Preferably, the focal length of the second lens is f2, the thickness of the fourth lens on the optical axis is CT4, and the following conditions are satisfied: -29< f2/CT4< -20. Therefore, the peripheral resolution and illumination of the system can be improved.
Preferably, wherein the focal length of the third lens is f3, the thickness of the first lens on the optical axis is CT1, and the following conditions are satisfied: 3< f3/CT1< 7.2. Therefore, the system aberration can be corrected to improve the imaging quality of the system.
Drawings
FIG. 1A is a schematic view of a four-piece optical imaging lens assembly according to a first embodiment of the present invention.
Fig. 1B is a graph illustrating the curvature of field and distortion aberration of the four-piece optical imaging lens assembly of the first embodiment in order from left to right.
FIG. 2A is a schematic view of a four-piece optical imaging lens assembly according to a second embodiment of the present invention.
Fig. 2B is a graph illustrating the curvature of field and distortion aberration of the four-piece optical imaging lens assembly of the second embodiment in order from left to right.
FIG. 3A is a schematic view of a four-piece optical imaging lens assembly according to a third embodiment of the present invention.
Fig. 3B is a graph illustrating the curvature of field and distortion aberration of the four-piece optical imaging lens assembly of the third embodiment in order from left to right.
FIG. 4A is a schematic view of a four-piece optical imaging lens assembly according to a fourth embodiment of the present invention.
Fig. 4B is a graph illustrating the curvature of field and distortion aberration of the four-piece optical imaging lens assembly of the fourth embodiment in order from left to right.
FIG. 5A is a schematic view of a four-piece optical imaging lens assembly according to a fifth embodiment of the present invention.
Fig. 5B is a graph illustrating the curvature of field and distortion aberration of the four-piece optical imaging lens assembly of the fifth embodiment in order from left to right.
FIG. 6A is a schematic view of a four-piece optical imaging lens assembly according to a sixth embodiment of the present invention.
FIG. 6B is a graph showing the curvature of field and distortion aberration of the four-piece optical imaging lens assembly of the sixth embodiment in order 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: 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 component
180. 280, 380, 480, 580, 680: image plane
190. 290, 390, 490, 590, 690: optical axis
f: focal length of four-piece optical imaging lens group
Fno: aperture value of four-piece optical imaging lens group
FOV: maximum field angle in four-piece optical imaging 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
R5: radius of curvature of object-side surface of third lens
R6: radius of curvature of image-side surface of third lens
CT 1: thickness of the first lens on the optical axis
CT 4: thickness of the fourth lens on the optical axis
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.
The first embodiment:
referring to fig. 1A and 1B, fig. 1A is a schematic view of a four-piece optical imaging lens assembly according to a first embodiment of the invention, and fig. 1B is a graph of curvature of field and distortion aberration of the four-piece optical imaging lens assembly according to the first embodiment, in order from left to right. In fig. 1A, the four-piece optical imaging 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 element 170, and an image plane 180, wherein the four lens elements have refractive power. The aperture stop 100 is disposed between an object side surface 111 and an image side surface 112 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 negative refractive power has an object-side surface 121 being concave in a paraxial region 190 thereof and an image-side surface 122 being concave in a paraxial region 190 thereof, 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 assembly 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 optical imaging 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 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 … … is a higher order aspheric coefficient.
In the four-piece optical imaging lens assembly of the first embodiment, the focal length of the four-piece optical imaging lens assembly is f, the aperture value (f-number) of the four-piece optical imaging lens assembly is Fno, and the maximum field angle (view angle) of the four-piece optical imaging lens assembly is FOV, which has the following values: f ═ 3.64 (millimeters); fno 2.27; and FOV 76.56 (degrees).
In the four-piece optical imaging lens assembly of the first embodiment, 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 0.832.
In the four-piece optical imaging lens assembly of the first embodiment, the focal length of the first lens element 110 is f1, and the focal length of the third lens element 130 is f3, and the following conditions are satisfied: f1/f3 equals 0.626.
In the four-piece optical imaging 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-0.904.
In the four-piece optical imaging lens assembly of the first embodiment, the focal length of the second lens element 120 is f2, and the focal length of the third lens element 130 is f3, and the following conditions are satisfied: f2/f 3-1.977.
In the four-piece optical imaging 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 2.856.
In the four-piece optical imaging 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 equals 0.424.
In the four-piece optical imaging lens assembly of the first embodiment, the combined focal length of the first lens element 110 and the second lens element 120 is f12, the focal length of the fourth lens element 140 is f4, and the following conditions are satisfied: f12/f4 is-1.202.
In the fourth embodiment of the present optical imaging lens assembly, the radius of curvature of the object-side surface of the third lens element is R5, the radius of curvature of the image-side surface of the third lens element is R6, and the following requirements are satisfied: R5/R6 ═ 1.742.
In the first embodiment of the four-piece optical imaging lens assembly, the focal length of the second lens element 120 is f2, the thickness of the fourth lens element 140 along the optical axis 190 is CT4, and the following conditions are satisfied: f2/CT 4-24.367.
In the first embodiment of the four-piece optical imaging lens assembly, the focal length of the third lens element 130 is f3, the thickness of the first lens element 110 along the optical axis 190 is CT1, and the following conditions are satisfied: f3/CT 1-6.639.
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 the surfaces 0-12 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 … denotes a higher-order aspheric coefficient. In addition, the following tables of the embodiments correspond to the schematic diagrams of the embodiments and the field curvature and distortion aberration curves, and the definitions of the data in the tables are the same as those in tables 1 and 2 of the first embodiment, which are not repeated herein.
Second embodiment
Referring to fig. 2A and 2B, fig. 2A is a schematic view of a four-piece optical imaging lens assembly according to a second embodiment of the invention, and fig. 2B is a graph of curvature of field and distortion aberration of the four-piece optical imaging lens assembly according to the second embodiment, in order from left to right. In fig. 2A, the four-piece optical imaging lens assembly includes an aperture stop 200 and an optical assembly, which includes, 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 lens elements have refractive power. The aperture stop 200 is disposed between an object-side surface 211 and an image-side surface 212 of the first lens 210.
The first lens element 210 with positive 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 negative refractive power has an object-side surface 221 being concave at a paraxial region 290 thereof and an image-side surface 222 being concave at a paraxial region 290 thereof, 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 thereof and an image-side surface 232 being convex at a paraxial region 290 thereof, and both 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 concave in a paraxial region 290 thereof and an image-side surface 242 being concave in a paraxial region 290 thereof, 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 disposed between the fourth lens element 240 and the image plane 280 without affecting the focal length of the four-piece optical imaging 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 3B, fig. 3A is a schematic view of a four-piece optical imaging lens assembly according to a third embodiment of the invention, and fig. 3B is a graph of curvature of field and distortion aberration of the four-piece optical imaging lens assembly according to the third embodiment, in order from left to right. In fig. 3A, the four-piece optical imaging lens assembly includes an aperture stop 300 and an optical assembly, which includes, 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 element 370 and an image plane 380, wherein the four lens elements in the four-piece optical imaging lens assembly have four refractive power. The aperture stop 300 is disposed between the object-side surface 311 and the image-side surface 312 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, an image-side surface 312 being concave at a paraxial region 390, and both the object-side surface 311 and the image-side surface 312 being aspheric.
The second lens element 320 with negative refractive power has an object-side surface 321 being concave at a paraxial region 390, and an image-side surface 322 being concave at a paraxial region 390, wherein 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, an image-side surface 332 being convex at a paraxial region 390, and both the object-side surface 331 and the image-side surface 332 being aspheric.
The fourth lens element 340 with negative refractive power is made of plastic material, and has an object-side surface 341 being convex at a position close to the optical axis 390, an image-side surface 342 being concave at a position close to the optical axis 390, the object-side surface 341 and the image-side surface 342 being aspheric, and at least one of the object-side surface 341 and the image-side surface 342 having 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 optical imaging 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, wherein fig. 4A is a schematic view of a four-piece optical imaging lens assembly according to a fourth embodiment of the invention, and fig. 4B is a graph of curvature of field and distortion aberration of the four-piece optical imaging lens assembly according to the fourth embodiment, in order from left to right. In fig. 4A, the four-piece optical imaging 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 lens elements in the four-piece optical imaging lens assembly have four refractive power. The aperture stop 400 is disposed between an object-side surface 411 and an image-side surface 412 of the first lens 410.
The first lens element 410 with positive refractive power has an object-side surface 411 being convex at a position close to an optical axis 490, an image-side surface 412 being concave at the position close to the optical axis 490, and both the object-side surface 411 and the image-side surface 412 being aspheric.
The second lens element 420 with negative refractive power has an object-side surface 421 being concave at a paraxial region 490 thereof, an image-side surface 422 being concave at a paraxial region 490 thereof, and the object-side surface 421 and the image-side surface 422 being 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 concave 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 disposed between the fourth lens element 440 and the image plane 480 without affecting the focal length of the four-piece optical imaging 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, wherein fig. 5A is a schematic view of a four-piece optical imaging lens assembly according to a fifth embodiment of the invention, and fig. 5B is a graph of curvature of field and distortion aberration of the four-piece optical imaging lens assembly according to the fifth embodiment, in order from left to right. In fig. 5A, the four-piece optical imaging 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 element 570 and an image plane 580, wherein the four lens elements in the four-piece optical imaging lens assembly have four refractive power. The aperture stop 500 is disposed between the object-side surface 511 and the image-side surface 512 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 negative refractive power has an object-side surface 521 being concave in a paraxial region 590, and an image-side surface 522 being concave 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 in a paraxial region 590, an image-side surface 532 being concave in a paraxial region 590, and both the object-side surface 531 and the image-side surface 532 being aspheric.
The fourth lens element 540 with negative refractive power has an object-side surface 541 being concave in a paraxial region 590, an image-side surface 542 being concave in a paraxial region 590, the object-side surface 541 and the image-side surface 542 being 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 optical imaging lens assembly.
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:
sixth embodiment
Referring to fig. 6A and 6B, wherein fig. 6A is a schematic diagram of a four-piece optical imaging lens assembly according to a sixth embodiment of the invention, and fig. 6B is a graph of curvature of field and distortion aberration of the four-piece optical imaging lens assembly according to the sixth embodiment, in order from left to right. In fig. 6A, the four-piece optical imaging lens assembly includes an aperture stop 600 and an optical assembly, which includes, 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 element 670 and an image plane 680, wherein the four lens elements in the four-piece optical imaging lens assembly have refractive power. The aperture stop 600 is disposed between an object-side surface 611 and an image-side surface 612 of the first lens 610.
The first lens element 610 with positive refractive power has an object-side surface 611 being convex in a paraxial region 690 thereof and an image-side surface 612 being concave in a paraxial region 690 thereof, and the object-side surface 611 and the image-side surface 612 are aspheric.
The second lens element 620 with negative refractive power has an object-side surface 621 being concave in a paraxial region 690 thereof and an image-side surface 622 being concave in a paraxial region 690 thereof, and the object-side surface 621 and the image-side surface 622 thereof 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, wherein the third lens element 630 is made of plastic material, 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 disposed between the fourth lens element 640 and the image plane 680 without affecting the focal length of the four-piece optical imaging lens assembly.
Further, the following table 11 and table 12 are referred to.
In the sixth embodiment, the curve equation of the aspherical surface represents the form as in the first embodiment. In addition, the following parameters are defined in the same way as in the first embodiment and will not be described herein.
The following data can be derived from tables 11 and 12:
in the four-piece optical imaging lens group provided by the invention, the lens can be made of plastic or glass, the production cost can be effectively reduced when the lens is made of plastic, and the degree of freedom of the configuration of the refractive power of the four-piece optical imaging lens group can be increased when the lens is made of glass. In addition, the object-side surface and the image-side surface of the lens elements of the four-piece optical imaging lens assembly can be aspheric, and the aspheric surfaces can be easily made into shapes other than spherical surfaces, so that more control variables can be obtained to reduce the aberration, and further the number of the lens elements can be reduced, thereby effectively reducing the total length of the four-piece optical imaging lens assembly.
In the four-piece optical imaging lens assembly provided by the invention, regarding the lens with refractive power, if the lens surface is convex and the position of the convex surface is not defined, the lens surface is convex at a position close to the optical axis; if a lens surface is concave and the concave position is not defined, that lens surface is concave at the paraxial region.
The four-piece optical imaging lens set provided by the invention can be applied to an optical system for moving focusing according to the 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 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 (10)
1. A four-piece optical imaging lens assembly comprising an aperture stop and an optical assembly comprising four lens elements, in order from an object side to an image side:
the aperture;
the first lens element with positive refractive power has an object-side surface being convex at a paraxial region thereof and an image-side surface being concave at a paraxial region thereof, and at least one of the object-side surface and the image-side surface of the first lens element is aspheric;
the second lens element with negative refractive power has an object-side surface being concave at a paraxial region thereof and an image-side surface being concave at a paraxial region thereof, and at least one of the object-side surface and the image-side surface of the second lens element is aspheric;
the third lens element with positive refractive power has an object-side surface being concave at a paraxial region thereof and an image-side surface being convex at a paraxial region thereof, and at least one of the object-side surface and the image-side surface of the third lens element is aspheric; and
the fourth lens element with negative refractive power has a concave image-side surface at a paraxial region thereof, at least one of an object-side surface and the image-side surface of the fourth lens element is aspheric, and at least one of the object-side surface and the image-side surface of the fourth lens element has an inflection point;
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: 0.6< f12/f3< 1.6.
2. The set of four-piece optical imaging 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 the following conditions are satisfied: 0.4< f1/f3< 1.2.
3. The set of four-piece optical imaging lenses of claim 1, wherein the first lens has a focal length of f1 and the fourth lens has a focal length of f4, and the following conditions are satisfied: -1.5< f1/f4< -0.7.
4. The set of four-piece optical imaging lenses 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, and the following conditions are satisfied: -3.2< f2/f3< -1.7.
5. The set of four-piece optical imaging lenses of claim 1, wherein the second lens has a focal length of f2, and the fourth lens has a focal length of f4, and the following conditions are satisfied: 2.7< f2/f4< 4.1.
6. The set of four-piece optical imaging lenses of claim 1, wherein the first lens element has a focal length f1, and the combined focal length of the second and third lens elements is f23, and the following conditions are satisfied: 0.2< f1/f23< 1.1.
7. The set of four-piece optical imaging lenses of claim 1, wherein the combined focal length of the first and second lenses is f12, and the combined focal length of the fourth lens is f4, and the following conditions are satisfied: -2.0< f12/f4< -1.0.
8. The objective lens assembly of claim 1, wherein the radius of curvature of the object-side surface of the third lens element is R5, and the radius of curvature of the image-side surface of the third lens element is R6, and the following conditions are satisfied: 1.5< R5/R6< 2.7.
9. The set of four-piece optical imaging lenses of claim 1, wherein the second lens element has a focal length of f2, and the fourth lens element has a thickness along the optical axis of CT4, wherein the following conditions are satisfied: -29< f2/CT4< -20.
10. The set of four-piece optical imaging lenses of claim 1, wherein the third lens element has a focal length of f3, the first lens element has a thickness CT1 along the optical axis, and the following conditions are satisfied: 3< f3/CT1< 7.2.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116819726A (en) * | 2023-06-21 | 2023-09-29 | 湖北华鑫光电有限公司 | 4p notebook computer lens |
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