CN107870407B - Five-piece imaging lens group - Google Patents
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- CN107870407B CN107870407B CN201610840625.8A CN201610840625A CN107870407B CN 107870407 B CN107870407 B CN 107870407B CN 201610840625 A CN201610840625 A CN 201610840625A CN 107870407 B CN107870407 B CN 107870407B
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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
- G02B13/0045—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 five or more 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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention discloses a five-piece imaging lens group, which comprises the following components 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 and an image-side surface being concave at a paraxial region; 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; a third lens element with negative refractive power having a concave image-side surface at a paraxial region; a fourth 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; a fifth lens element with negative refractive power, wherein the image-side surface of the fifth lens element is concave at a position close to the optical axis, thereby achieving a five-lens imaging lens assembly with high resolution, low distortion and low manufacturing tolerance.
Description
Technical Field
The present invention relates to an imaging lens assembly, and more particularly to a miniaturized five-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.
Conventional 3-4 piece small lenses, such as US7,564,635 and US7,920,340, mounted on mobile devices, such as mobile phones, tablet computers, and other wearable electronic devices, cannot exhibit finer image quality; while the five-piece type small lens may have a better image quality, when the aperture is large, such as US8,605,368, US8,649,113, TW application numbers 102137030, 102121155, the sensitivity problem of manufacturing and assembling is often accompanied, so that the mass production is not easy, and the mass production cost is increased. Or to reduce assembly tolerances, the imaging quality of the periphery must be sacrificed, obscuring or distorting the imaging of the periphery.
Therefore, the present invention is motivated to develop a high-quality lens with high resolution and low manufacturing assembly tolerance.
Disclosure of Invention
The present invention provides a five-piece imaging lens assembly, and more particularly, to a five-piece imaging lens assembly with high resolution, low distortion and low manufacturing tolerance.
To achieve the above object, the present invention provides a five-piece 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 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 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 negative refractive power having a concave image-side surface at a paraxial region thereof, wherein at least one of an object-side surface and the image-side surface thereof is aspheric; a fourth 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 is aspheric; the fifth lens element with negative refractive power has a concave image-side surface at a paraxial region thereof, and at least one of an object-side surface and the image-side surface thereof is aspheric.
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: -2.7< f23/f4< -1.5. Therefore, the large visual angle and the large aperture characteristic of the five-piece imaging lens group are favorably improved, the sensitivity of the five-piece imaging lens group can be reduced, the manufacture of each lens is favorably realized, and the production yield is improved.
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: -0.7< f1/f2< -0.3. Therefore, the refractive power configuration of the first lens element and the second lens element is 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 fourth lens is f4, and the following conditions are satisfied: -3.1< f2/f4< -1.8. Therefore, the large visual angle and the large aperture characteristic of the five-piece imaging lens group are favorably improved, the sensitivity of the five-piece imaging lens group can be reduced, the manufacture of each lens is favorably realized, and the production yield is improved.
Preferably, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, and the following conditions are satisfied: -1.5< f4/f5< -0.9. Therefore, the back focal length of the five-piece imaging lens group can be effectively shortened, and the miniaturization of the five-piece imaging lens group is maintained.
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: -0.15< f1/f3< -0.05. Therefore, the balance of the refractive power of the five-piece imaging lens set can be maintained, and the optimal imaging effect is achieved.
Preferably, the focal length of the second lens is f2, the focal length of the fifth lens is f5, and the following conditions are satisfied: 2.3< f2/f5< 3.7. Therefore, the total length of the five-piece imaging lens group is favorably shortened, and the miniaturization of the five-piece imaging lens group is maintained.
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: 0.7< f1/f4< 1.6. Therefore, the balance of the refractive power of the five-piece imaging lens set can be maintained, and the optimal imaging effect is achieved.
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: -0.75< f1/f23< -0.35. Therefore, the balance of the refractive power of the five-piece imaging lens set can be maintained, and the optimal imaging effect is achieved.
Preferably, a combined focal length of the second lens element and the third lens element is f23, a combined focal length of the fourth lens element and the fifth lens element is f45, and the following conditions are satisfied: -0.1< f23/f45< -0.005. When f23/f45 satisfies the above relation, the resolution capability of the five-piece imaging lens assembly is significantly improved while having a large angle, a high frame count and a low lens height, whereas if the resolution capability exceeds the data value range of the above optical formula, the performance, resolution capability and yield of the five-piece imaging lens assembly are low.
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: 1.0< f12/f34< 2.4. When f12/f34 satisfies the above relation, the resolution capability of the five-piece imaging lens assembly is significantly improved while having a large angle, a high frame count and a low lens height, whereas if the resolution capability exceeds the data value range of the above optical formula, the performance, resolution capability and yield of the five-piece imaging lens assembly are low.
Preferably, a focal length of the third lens element and the fourth lens element is f34, a focal length of the fifth lens element is f5, and the following conditions are satisfied: -1.6< f34/f5< -0.9. When f34/f5 satisfies the above relation, the resolution capability of the five-piece imaging lens assembly is significantly improved while having a large angle, a high frame count and a low lens height, whereas if the resolution capability exceeds the data value range of the above optical formula, the performance, resolution capability and yield of the five-piece imaging lens assembly are low.
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: 0.5< f1/f234< 1.5. By proper configuration of the refractive power, the spherical aberration and astigmatism can be reduced.
Preferably, a focal length of the second lens element, the third lens element and the fourth lens element is f234, a focal length of the fifth lens element is f5, and the following conditions are satisfied: -2.0< f234/f5< -1.1. 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: 1.3< f123/f4< 2.6. By proper configuration of the refractive power, the spherical aberration and astigmatism can be reduced.
Preferably, a combined focal length of the first lens element, the second lens element and the third lens element is f123, and a combined focal length of the fourth lens element and the fifth lens element is f45, and the following conditions are satisfied: 0.005< f123/f45< 0.1. 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: 30< V1-V2< 42. Therefore, the chromatic aberration of the five-piece imaging lens group can be corrected.
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: 30< V4-V3< 42. Therefore, the chromatic aberration of the five-piece imaging lens group can be corrected.
Preferably, the overall focal length of the five-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: 0.6< f/TL < 0.95. Therefore, the five-piece imaging lens group can be favorably mounted on a light and thin electronic product, and a wide picture angle (field angle) can be favorably obtained, and the miniaturization of the five-piece imaging lens group can be favorably maintained.
To achieve the above objects, the present invention provides a technique, means and other effects, which are described in detail below with reference to the accompanying drawings.
Drawings
Fig. 1A is a schematic view of a five-piece imaging lens set according to a first embodiment of the invention.
Fig. 1B is a graph illustrating the curvature of field and distortion aberration of the five-lens imaging lens assembly of the first embodiment in order from left to right.
Fig. 2A is a schematic view of a five-piece imaging lens assembly according to a second embodiment of the invention.
Fig. 2B is a graph of field curvature and distortion aberration curves of the five-piece imaging lens assembly of the second embodiment in order from left to right.
Fig. 3A is a schematic view of a five-piece imaging lens assembly according to a third embodiment of the invention.
Fig. 3B is a graph illustrating the curvature of field and distortion of the image plane of the five-lens imaging lens assembly of the third embodiment in order from left to right.
Description of the symbols in the drawings:
100. 200 and 300: aperture
110. 210, 310: first lens
111. 211, 311: object side surface
112. 212, 312: surface of image side
120. 220, 320: second lens
121. 221, 321: object side surface
122. 222, 322: surface of image side
130. 230, 330: third lens
131. 231, 331: object side surface
132. 232, 332: surface of image side
140. 240, 340: fourth lens
141. 241, 341: object side surface
142. 242, 342: surface of image side
150. 250, 350: fifth lens element
151. 251, 351: object side surface
152. 252, 352: surface of image side
170. 270, 370: infrared filtering component
180. 280, 380: image plane
190. 290, 390: optical axis
f: focal length of five-piece imaging lens group
Fno: aperture value of five-piece imaging lens group
FOV: maximum field angle in five-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 45: the combined focal length of the fourth lens and the fifth 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
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood 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.
First embodiment
Referring to fig. 1A and fig. 1B, fig. 1A is a schematic view of a five-piece imaging lens assembly according to a first embodiment of the disclosure, and fig. 1B is a graph of curvature of field and distortion aberration of the five-piece imaging lens assembly of the first embodiment in order from left to right. In fig. 1A, the five-lens 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, a fifth lens element 150, an ir-cut filter 170 and an image plane 180, wherein five lens elements have refractive power. The aperture stop 100 is disposed between the image-side surface 112 of the first lens 110 and an object.
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 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 negative refractive power has an object-side surface 131 being convex in a paraxial region 190 and an image-side surface 132 being concave in 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 positive 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, and is made of plastic material, wherein the object-side surface 141 and the image-side surface 142 are aspheric.
The fifth lens element 150 with negative refractive power has an object-side surface 151 being concave at a paraxial region 190 and an image-side surface 152 being convex at a paraxial region 190, wherein the object-side surface 151 and the image-side surface 152 are aspheric, and at least one of the object-side surface 151 and the image-side surface 152 has at least one inflection point.
The ir-cut filter assembly 170 is made of glass, and is disposed between the fifth lens element 150 and the image plane 180 without affecting the focal length of the five-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 five-piece imaging lens assembly of the first embodiment, the focal length of the five-piece imaging lens assembly is f, the aperture value (f-number) of the five-piece imaging lens assembly is Fno, and the maximum field angle of view of the five-piece imaging lens assembly is FOV, which is as follows: f ═ 3.38 (millimeters); fno 2.2; and FOV 84 (degrees).
In the first embodiment of the five-piece imaging lens assembly, 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-0.45.
In the fifth 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-2.30.
In the fifth lens element set of the first embodiment, the focal length of the fourth lens element 140 is f4, the focal length of the fifth lens element 150 is f5, and the following conditions are satisfied: f4/f5 is-1.19.
In the fifth lens group 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-0.10.
In the fifth lens element set of the first embodiment, the focal length of the second lens element 120 is f2, the focal length of the fifth lens element 150 is f5, and the following conditions are satisfied: f2/f5 is 2.73.
In the fifth 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 1.03.
In the fifth 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-0.56.
In the fifth 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-1.84.
In the fifth 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 combined focal length of the fourth lens element 140 and the fifth lens element 150 is f45, and the following conditions are satisfied: f23/f45 is-0.06.
In the fifth 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 equals 1.47.
In the fifth imaging lens assembly of the first embodiment, a combined focal length of the third lens element 130 and the fourth lens element 140 is f34, a focal length of the fifth lens element 150 is f5, and the following conditions are satisfied: f34/f5 is-1.27.
In the fifth 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 is 0.74.
In the fifth imaging lens assembly of the first embodiment, a combined focal length of the second lens element 120, the third lens element 130 and the fourth lens element 140 is f234, a focal length of the fifth lens element 150 is f5, and the following conditions are satisfied: f234/f5 is-1.64.
In the first embodiment of the five-lens 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 1.76.
In the fifth imaging 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, and a combined focal length of the fourth lens element 140 and the fifth lens element 150 is f45, and the following conditions are satisfied: f123/f45 is 0.06.
In the five-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 ═ 34.5.
In the five-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 ═ 34.5.
In the first embodiment of the present invention, the total focal length of the five-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 0.86.
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 0-15 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 and … … denote higher-order aspheric coefficients. In addition, the following tables in the embodiments correspond to the schematic diagrams and the field curvature diagrams 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 are not repeated herein.
Second embodiment
Referring to fig. 2A and fig. 2B, fig. 2A is a schematic view of a five-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 five-piece imaging lens assembly of the second embodiment in order from left to right. In fig. 2A, the five-lens 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, a fifth lens element 250, an ir-cut filter 270 and an image plane 280, wherein five lens elements have refractive power. The aperture stop 200 is disposed between the image-side surface 212 of the first lens element 210 and an object.
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 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 negative refractive power has an object-side surface 231 being concave at a paraxial region 290 thereof and an image-side surface 232 being concave at a paraxial region 290 thereof, and the object-side surface 231 and the image-side surface 232 are aspheric.
The fourth lens element 240 with positive 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, and the object-side surface 241 and the image-side surface 242 are aspheric.
The fifth lens element 250 with negative refractive power has an object-side surface 251 being convex at a paraxial region 290 and an image-side surface 252 being concave at a paraxial region 290, wherein the object-side surface 251 and the image-side surface 252 are aspheric and at least one of the object-side surface 251 and the image-side surface 252 has at least one inflection point.
The ir-cut filter 270 is made of glass, and is disposed between the fifth lens element 250 and the image plane 280 without affecting the focal length of the five-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 five-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 five-piece imaging lens assembly of the third embodiment in order from left to right. In fig. 3A, the five-lens 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, a fifth lens element 350, an ir-cut filter 370 and an image plane 380, wherein five lens elements have refractive power. The aperture stop 300 is disposed between the image-side surface 312 of the first lens element 310 and an object.
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 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 negative refractive power has an object-side surface 331 being concave at a paraxial region 390 thereof and an image-side surface 332 being concave at a paraxial region 390 thereof, and the object-side surface 331 and the image-side surface 332 are aspheric.
The fourth lens element 340 with positive refractive power has an object-side surface 341 being concave at a paraxial region 390, and an image-side surface 342 being convex at a paraxial region 390, wherein the fourth lens element 340 is made of plastic material, and both the object-side surface 341 and the image-side surface 342 are aspheric.
The fifth lens element 350 with negative refractive power has an object-side surface 351 being concave in a paraxial region 390 thereof and an image-side surface 352 being concave in a paraxial region 390 thereof, wherein the object-side surface 351 and the image-side surface 352 are aspheric, and at least one of the object-side surface 351 and the image-side surface 352 has at least one inflection point.
The ir-cut filter 370 is made of glass and disposed between the fifth lens element 350 and the image plane 380 without affecting the focal length of the five-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:
in the five-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 five-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 five-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 five-piece imaging lens assembly.
In the five-piece 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 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 five-piece imaging 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 in many aspects.
In summary, the above embodiments and drawings are only preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (18)
1. A five-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 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 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 negative refractive power having a concave image-side surface at a paraxial region thereof, wherein at least one of an object-side surface and the image-side surface thereof is aspheric;
a fourth 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 is aspheric;
a fifth lens element with negative refractive power having a concave image-side surface at a paraxial region thereof, at least one of an object-side surface and the image-side surface thereof being aspheric, and at least one of the object-side surface and the image-side surface thereof having at least one inflection point;
the combined focal length of the second lens and the third lens is f23, the combined focal length of the fourth lens and the fifth lens is f45, and the following conditions are satisfied: -0.1< f23/f45< -0.005.
2. The five-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: -2.7< f23/f4< -1.5.
3. The five-piece imaging lens assembly 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: -0.7< f1/f2< -0.3.
4. The five-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: -3.1< f2/f4< -1.8.
5. The five-piece imaging lens assembly of claim 1, wherein the focal length of the fourth lens element is f4, the focal length of the fifth lens element is f5, and the following conditions are satisfied: -1.5< f4/f5< -0.9.
6. The five-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: -0.15< f1/f3< -0.05.
7. The five-piece imaging lens assembly of claim 1, wherein the second lens element has a focal length of f2, and the fifth lens element has a focal length of f5, wherein the following conditions are satisfied: 2.3< f2/f5< 3.7.
8. The five-piece imaging lens assembly 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: 0.7< f1/f4< 1.6.
9. The five-piece imaging lens assembly of claim 1, wherein the first lens element has a focal length of f1, and the combined focal length of the second and third lens elements is f23, wherein the following conditions are satisfied: -0.75< f1/f23< -0.35.
10. The five-piece imaging lens assembly 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: 1.0< f12/f34< 2.4.
11. The five-piece imaging lens assembly of claim 1, wherein the combined focal length of the third lens element and the fourth lens element is f34, the focal length of the fifth lens element is f5, and the following conditions are satisfied: -1.6< f34/f5< -0.9.
12. The five-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, wherein the following conditions are satisfied: 0.5< f1/f234< 1.5.
13. The five-piece imaging lens assembly of claim 1, wherein the combined focal length of the second lens element, the third lens element and the fourth lens element is f234, the focal length of the fifth lens element is f5, and the following conditions are satisfied: -2.0< f234/f5< -1.1.
14. The five-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: 1.3< f123/f4< 2.6.
15. The five-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 combined focal length of the fourth lens element and the fifth lens element is f45, and the following conditions are satisfied: 0.005< f123/f45< 0.1.
16. The five-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: 30< V1-V2< 42.
17. The five-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: 30< V4-V3< 42.
18. The five-piece imaging lens assembly of claim 1, wherein the overall focal length of the five-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: 0.6< f/TL < 0.95.
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| CN114236754B (en) * | 2018-12-24 | 2023-12-29 | 浙江舜宇光学有限公司 | Optical imaging system |
| CN110361852B (en) * | 2019-07-24 | 2021-10-26 | Oppo广东移动通信有限公司 | Lens, camera module and electronic equipment |
| CN110596866B (en) * | 2019-10-29 | 2024-08-20 | 浙江舜宇光学有限公司 | Optical imaging lens |
| WO2021119928A1 (en) * | 2019-12-16 | 2021-06-24 | 诚瑞光学(常州)股份有限公司 | Optical camera lens |
| WO2021127824A1 (en) * | 2019-12-23 | 2021-07-01 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
| TWI750615B (en) | 2020-01-16 | 2021-12-21 | 大立光電股份有限公司 | Image capturing optical lens assembly, imaging apparatus and electronic device |
| CN111142238A (en) * | 2020-02-20 | 2020-05-12 | 浙江舜宇光学有限公司 | Optical imaging lens |
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