CN109116511B - Four-piece imaging lens group - Google Patents
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- CN109116511B CN109116511B CN201710493549.2A CN201710493549A CN109116511B CN 109116511 B CN109116511 B CN 109116511B CN 201710493549 A CN201710493549 A CN 201710493549A CN 109116511 B CN109116511 B CN 109116511B
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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 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. Therefore, the invention provides a four-piece imaging lens set which can be applied to portable electronic products, does not cause the total length of the lens to be overlong, and simultaneously has long focal length, high pixels and low lens height.
Description
Technical Field
The present invention relates to a four-piece imaging lens assembly, and more particularly to a miniaturized four-piece imaging lens assembly for use in electronic products.
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 known four-piece lens group cannot meet the requirement of higher-order photographing lens modules.
Therefore, it is a motivation for the present invention to develop an imaging lens assembly to solve the above-mentioned drawbacks.
Disclosure of Invention
The present invention provides a four-piece imaging lens assembly, and more particularly, to a four-piece imaging lens assembly that can be applied to a portable electronic device, and has a long focal length, high pixels, and a low lens height without causing an overlong total lens length.
Therefore, in order to achieve the above object, the present invention provides a four-piece imaging lens assembly, in order from an object side to an image side: an aperture; a first lens element with positive refractive power having an object-side surface being convex at a paraxial region thereof and an image-side surface being convex at a paraxial region thereof, at least one of the object-side surface and the image-side surface being aspheric; a second 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, at least one of the object-side surface and the image-side surface being 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 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 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: -0.9< f1/f2< -0.4. 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, the focal length of the second lens is f2, the focal length of the third lens is f3, and the following conditions are satisfied: -1.0< f2/f3< -0.3. Therefore, the refractive power configurations of the second lens element and the third lens element are balanced, which is helpful for aberration correction and sensitivity reduction.
Preferably, the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the following conditions are satisfied: -1.9< f3/f4< -1.3. Therefore, the total optical length of the system is effectively reduced.
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: f1/f3 is more than 0.35 and less than 0.48. Therefore, the refractive power of the first lens element is effectively distributed, and the sensitivity of the four-piece imaging lens assembly is reduced.
Preferably, the focal length of the first lens is f1, the focal length of the third lens is f4, and the following conditions are satisfied: -0.9< f1/f4< -0.4. Therefore, the refractive power of the first lens element is effectively distributed, and the sensitivity of the four-piece imaging 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: f2/f4 is more than 0.7 and less than 1.4. Therefore, the distribution of the negative refractive power of the system is more appropriate, and the aberration of the system 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: -0.3< f1/f23< 0.2. Therefore, when f1/f23 satisfies the above condition, the resolution capability of the four-piece imaging lens assembly is significantly improved.
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: -0.6< f12/f34 < -0.2. Thus, 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: -28< f23/f4< 7.2. When f23/f4 satisfies the above relationship, the four-piece imaging lens assembly has high pixel and low lens height, and the resolution capability is significantly improved, otherwise, if the data value range of the above optical formula is exceeded, the performance, resolution capability, and yield of the four-piece imaging lens assembly are low, and the yield is insufficient.
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: -1.3< f1/f234< -0.7. By proper configuration of the refractive power, the spherical aberration and astigmatism can be reduced.
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: -1.1< f123/f4< -0.7. By proper configuration of the refractive power, the spherical aberration and astigmatism can be reduced.
Preferably, the first lens has an abbe number of V1, the second lens has an abbe number of V2, and the following conditions are satisfied: 27< V1-V2< 40. Therefore, the chromatic aberration of the four-piece imaging lens group is effectively reduced.
Preferably, the fourth lens has an abbe number of V4, the third lens has an abbe number of V3, and the following conditions are satisfied: 27< V4-V3< 40. Therefore, the chromatic aberration of the four-piece imaging lens group is effectively reduced.
Preferably, the overall focal length of the four-piece imaging lens assembly 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: f/TL is more than 0.8 and less than 1.2. Therefore, the four-piece imaging lens group can be kept miniaturized and can be carried on light and thin electronic products.
To achieve the above objects, the present invention provides a method, a computer program product and a computer program product for implementing the method.
Drawings
FIG. 1A is a schematic view of a four-piece imaging lens set according to a first embodiment of the present invention.
Fig. 1B is a graph illustrating the curvature of field and distortion of the four-piece imaging lens assembly of the first embodiment in order from left to right.
FIG. 2A is a diagram of a four-piece imaging lens set according to a second embodiment of the present invention.
Fig. 2B is a graph of field curvature and distortion aberration curves of the four-piece imaging lens assembly of the second embodiment in order from left to right.
FIG. 3A is a diagram of a four-piece imaging lens set according to a third embodiment of the present invention.
Fig. 3B is a graph illustrating the curvature of field and distortion of the four-piece imaging lens assembly of the third embodiment in order from left to right.
FIG. 4A is a diagram of a fourth embodiment of the imaging lens assembly.
Fig. 4B is a graph of field curvature and distortion aberration curves of the four-piece imaging lens assembly of the fourth embodiment in order from left to right.
FIG. 5A is a diagram of a fourth imaging lens set according to a fifth embodiment of the present invention.
Fig. 5B is a graph illustrating the curvature of field and distortion of the four-piece imaging lens assembly of the fifth embodiment in order from left to right.
The reference numbers in the figures illustrate:
100. 200, 300, 400, 500: aperture
110. 210, 310, 410, 510: first lens
111. 211, 311, 411, 511: object side surface
112. 212, 312, 412, 512: surface of image side
120. 220, 320, 420, 520: second lens
121. 221, 321, 421, 521: object side surface
122. 222, 322, 422, 522: surface of image side
130. 230, 330, 430, 530: third lens
131. 231, 331, 431, 531: object side surface
132. 232, 332, 432, 532: surface of image side
140. 240, 340, 440, 540: fourth lens
141. 241, 341, 441, 541: object side surface
142. 242, 342, 442, 542: surface of image side
170. 270, 370, 470, 570: infrared filtering component
180. 280, 380, 480, 580: image plane
190. 290, 390, 490, 590: optical axis
f: focal length of four-piece imaging lens group
Fno: aperture value of four-piece imaging lens group
FOV: maximum field angle in four-piece 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 5: focal length of fifth 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
V1: abbe number of first lens
V2: abbe number of second lens
V3: abbe number of third lens
V4: abbe number of fourth lens
TL: distance between the object side surface of the first lens element and the image plane on the optical axis
Detailed Description
< first embodiment >
Referring to fig. 1A and fig. 1B, fig. 1A is a schematic view of a four-piece 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 imaging lens assembly of the first embodiment in order from left to right. In fig. 1A, the four-piece imaging lens assembly includes an aperture stop 100 and an optical assembly including, 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 lens elements in the four-piece imaging lens assembly have four refractive power. The aperture stop 100 is disposed between an object-side surface 111 and an image-side surface 112 of the first lens element 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 convex 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 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 concave at a paraxial region 190 and an image-side surface 142 being convex 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 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 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 four-piece imaging lens group of the first embodiment, the focal length of the four-piece imaging lens group is f, the aperture value (f-number) of the four-piece imaging lens group is Fno, and the maximum field angle (angle of view) of the four-piece imaging lens group is FOV, which is as follows: f ═ 5.366 (millimeters); fno 2.4; and FOV 45.8 (degrees).
In the four-piece imaging 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-0.64.
In the four-piece imaging 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 is-0.54.
In the four-piece imaging 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-1.74.
In the four-piece imaging 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 0.35.
In the first embodiment of the four-piece imaging lens assembly, 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-0.60.
In the four-piece 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 0.94.
In the four-piece 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, which satisfies the following conditions: f1/f23 is-0.14.
In the four-piece imaging 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 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-0.43.
In the four-piece imaging 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 4.21.
In the four-piece imaging lens assembly of the first embodiment, the focal length of the first lens element 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 ═ 1.02.
In the first embodiment of the four-piece imaging lens assembly, 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 is-0.90.
In the four-piece imaging lens assembly of the first embodiment, the abbe number of the first lens element 110 is V1, the abbe number of the second lens element 120 is V2, and the following conditions are satisfied: V1-V2 ═ 34.20.
In the four-piece imaging lens assembly of the first embodiment, the fourth lens element 140 has an abbe number of V4, the third lens element 130 has an abbe number of V3, and the following conditions are satisfied: V4-V3 ═ 34.20.
In the first embodiment of the present invention, the overall focal length of the four-piece imaging lens assembly is f, the distance between the object-side surface 111 of the first lens element 110 and the image plane 180 on the optical axis 190 is TL, and the following conditions are satisfied: f/TL is 1.02.
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 … 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 fig. 2B, fig. 2A is a schematic diagram of a four-piece 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 imaging lens assembly of the second embodiment in order from left to right. In fig. 2A, the four-piece imaging 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 lens elements in the four-piece imaging lens assembly have four refractive power. The aperture stop 200 is disposed between an object-side surface 211 and an image-side surface 212 of the first lens element 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 convex 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 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 concave at a paraxial region 290 thereof and an image-side surface 242 being convex at 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 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 fig. 3B, fig. 3A is a schematic view of a four-piece 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 imaging lens assembly of the third embodiment in order from left to right. In fig. 3A, the four-piece imaging 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 lens elements in the four-piece imaging lens assembly have four refractive power. The stop 300 is disposed between an object-side surface 311 and an image-side surface 312 of the first lens element 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 convex 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 negative 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 concave at a position close to the optical axis 390, and an image-side surface 342 being convex at 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 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, fig. 4A is a schematic view of a four-piece 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 imaging lens assembly of the fourth embodiment in order from left to right. In fig. 4A, the four-piece 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 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 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 negative refractive power has an object-side surface 421 being convex at a paraxial region 490 thereof and an image-side surface 422 being concave 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 concave at a paraxial region 490 thereof and an image-side surface 442 being convex 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 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, fig. 5A is a schematic view of a four-piece 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 imaging lens assembly of the fifth embodiment in order from left to right. In fig. 5A, the four-piece 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 570 and an image plane 580, wherein the four lens elements in the four-piece imaging lens assembly have four refractive power. The stop 500 is disposed between an object-side surface 511 and an image-side surface 512 of the first lens element 510.
The first lens element 510 with positive refractive power has an object-side surface 511 being convex in a paraxial region 590, and an image-side surface 512 being convex in a paraxial region 590, wherein the object-side surface 511 and the image-side surface 512 are aspheric.
The second lens element 520 with negative refractive power has an object-side surface 521 being convex 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 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 concave in a paraxial region 590 and an image-side surface 542 being convex in a paraxial region 590, the object-side surface 541 and the image-side surface 542 are both 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 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:
in the four-piece 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 refractive power configuration of the four-piece 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 in the four-piece imaging lens assembly can be aspheric, and the aspheric surface can be easily made into shapes other than a spherical surface, so that more control variables can be obtained to reduce the aberration, and further the number of the lens used can be reduced, thereby effectively reducing the total length of the four-piece imaging lens assembly.
In the four-lens imaging lens assembly provided by the invention, for a 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 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 imaging lens group 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 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 in the claims of the present invention should be covered by the claims of the present invention.
Claims (14)
1. A four-lens imaging lens assembly, in order from an object side to an image side comprising:
an aperture;
a first lens element with positive refractive power having an object-side surface being convex at a paraxial region thereof and an image-side surface being convex at a paraxial region thereof, at least one of the object-side surface and the image-side surface being aspheric;
a second 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, at least one of the object-side surface and the image-side surface being 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 concave at a paraxial region thereof and an image-side surface being convex at a paraxial region thereof, at least one of the object-side surface and the image-side surface being aspheric;
the combined focal length of the first lens and the second lens is f12, the combined focal length of the third lens and the fourth lens is f34, and the following conditions are satisfied: -0.6< f12/f34 ≦ 0.41.
2. The set of four-piece imaging 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: -0.9< f1/f2< -0.4.
3. The four-piece imaging lens assembly 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: -1.0< f2/f3< -0.3.
4. The four-piece imaging lens assembly of claim 1, wherein the third lens element has a focal length f3, and the fourth lens element has a focal length f4, wherein the following conditions are satisfied: -1.9< f3/f4< -1.3.
5. The four-piece imaging lens assembly 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: 0.35< f1/f3< 0.48.
6. The four-piece imaging lens assembly of claim 1, wherein the first lens element has a focal length f1, and the fourth lens element has a focal length f4, wherein the following conditions are satisfied: -0.9< f1/f4< -0.4.
7. The four-piece imaging lens assembly 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: 0.7< f2/f4< 1.4.
8. The four-piece imaging lens assembly 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, wherein the following conditions are satisfied: -0.3< f1/f23< 0.2.
9. The four-piece imaging lens assembly 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: 28< f23/f4< 7.2.
10. The four-piece imaging lens assembly 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 the following conditions are satisfied: -1.3< f1/f234< -0.7.
11. The four-piece imaging lens assembly 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: -1.1< f123/f4< -0.7.
12. The four-piece imaging lens assembly of claim 1, wherein the first lens element has an abbe number of V1 and the second lens element has an abbe number of V2, wherein the following conditions are satisfied: 27< V1-V2< 40.
13. The four-piece imaging lens assembly of claim 1, wherein the fourth lens element has an abbe number of V4, the third lens element has an abbe number of V3, and the following conditions are satisfied: 27< V4-V3< 40.
14. The four-piece imaging lens assembly of claim 1, wherein the overall focal length of the four-piece imaging lens assembly is f, the distance between the object-side surface of the first lens element and the image plane is TL, and the following conditions are satisfied: 0.8< f/TL < 1.2.
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| WO2022061676A1 (en) * | 2020-09-24 | 2022-03-31 | 欧菲光集团股份有限公司 | Optical lens, image capture module, and electronic apparatus |
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| CN105785554A (en) * | 2014-11-25 | 2016-07-20 | 大立光电股份有限公司 | Optical photographing lens assembly, image capturing device and electronic device |
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| CN105785554A (en) * | 2014-11-25 | 2016-07-20 | 大立光电股份有限公司 | Optical photographing lens assembly, image capturing device and electronic device |
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