CN111830670B - Five-piece type wide-angle lens group - Google Patents
Five-piece type wide-angle lens group Download PDFInfo
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- CN111830670B CN111830670B CN201910311920.8A CN201910311920A CN111830670B CN 111830670 B CN111830670 B CN 111830670B CN 201910311920 A CN201910311920 A CN 201910311920A CN 111830670 B CN111830670 B CN 111830670B
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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Abstract
The present invention is a five-piece wide-angle lens set from an object side to an image sideThe sequence is as follows: a first lens element with negative refractive power, an aperture stop, a second lens element with positive refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, and a fifth lens element with negative refractive power; the radius of curvature of the object-side surface of the second lens element is R3, the radius of curvature of the image-side surface of the second lens element is R4, the overall focal length of the five-piece wide-angle lens group is f, and the focal lengths of the first, second and fourth lens elements are f1, f2 and f4, respectively, and the following conditions are satisfied: 1.9 mm<f+(R3+R4)/(R3‑R4)<2.9 mm and-2.0 mm‑1<f1/(f2*f4)<1.2 mm‑1Therefore, the present invention provides a five-piece wide-angle lens assembly with wide viewing angle, high resolution, short lens length and small distortion.
Description
Technical Field
The invention relates to a five-piece wide-angle lens group, in particular to a miniaturized five-piece wide-angle lens group applied to electronic products.
Background
With the development of high-specification mobile devices such as smart phones and tablet computers, small photographic lenses with high image quality are equipped in a standard manner, and with the popularity of network communities, more and more people like to take pictures or share pictures with others after self-photographing, and requirements on the shooting angle are more and more increased for game machines, driving recorders, security cameras and the like, so that the requirements on the shooting angle and the image quality of the lenses are more and more strict. Patents US 8335043 and US8576497 use 2 lens groups, 5-6 lens groups to achieve the purpose of large angle, but the distortion (distortion) is too large, and as in patents US 8593737, US8576497 and US 8395853, the maximum field of view (FOV) is less than 85 degrees, and the Total Length (TL) of the lens group is too long.
Secondly, the requirement of large aperture is not too strict, but the requirements of angle drawing and lens length are the problems that manufacturers need to solve further, when the camera lens is applied to the biomedical, driving recorder, video camera or other electronic products, but the current traditional camera lens mounted on the electronic products in the aforementioned field mainly adopts a four-piece lens structure, which has the defects of insufficient angle drawing and overlong lens length.
Therefore, how to develop a wide-angle lens assembly with wide viewing angle, high resolution, short lens length and small distortion is the motivation for the present invention.
Disclosure of Invention
The present invention provides a five-piece wide-angle lens assembly, and more particularly, to a five-piece wide-angle lens assembly with wide viewing angle, high resolution, short lens length, and small distortion.
To achieve the aforesaid objective, the present invention provides a five-lens wide-angle lens assembly, comprising an aperture stop and an optical assembly consisting of five lenses, in order from an object side to an image side: the first lens element with negative refractive power has at least one of an object-side surface and an image-side surface thereof being aspheric; the aperture; the second lens element with positive refractive power has an object-side surface being convex 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 second lens element is aspheric; the third lens element with negative 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 second lens element is aspheric; the fourth 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 fourth lens element is aspheric; the fifth lens element with negative 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, wherein at least one of the object-side surface and the image-side surface of the fifth lens element is aspheric, and at least one of the object-side surface and the image-side surface of the fifth lens element has at least one inflection point;
the radius of curvature of the object-side surface of the second lens element is R3, the radius of curvature of the image-side surface of the second lens element is R4, the overall focal length of the five-piece wide-angle lens group is f, the focal length of the first lens element is f1, the focal length of the second lens element is f2, and the focal length of the fourth lens element is f4, where: 1.9 mm<f+(R3+R4)/(R3-R4)<2.9 mm and-2.0 mm-1<f1/(f2*f4)<1.2 mm-1。
Preferably, the overall focal length of the five-piece wide-angle lens group is f, the focal length of the first lens element is f1, and the following conditions are satisfied: -0.68< f/f1< -0.26. Therefore, the refractive power of the first lens is maintained in a proper range, the field of view (FOV) of the five-piece wide-angle lens group is maintained at a proper angle, and the assembly sensitivity of the first lens is reduced.
Preferably, the combined focal length of the third lens element, the fourth lens element and the fifth lens element is f345, and the overall focal length of the five-piece wide-angle lens group is f, and the following conditions are satisfied: -13.0< f345/f < 28.5. Therefore, the refractive power configuration of the object side end and the image side end of the five-piece wide-angle lens assembly is beneficial to meeting the requirements of better aberration balance and miniaturization.
Preferably, a combined focal length of the second lens and the third lens is f23, a combined focal length of the fourth lens and the fifth lens is f45, and the following conditions are satisfied: 0.29< f23/f45< 0.87. This is advantageous in obtaining a wide field angle (angle of view) and effectively correcting field curvature.
Preferably, the focal length of the first lens is f1, and the combined focal length of the second lens, the third lens, the fourth lens and the fifth lens is f2345, and the following conditions are satisfied: -4.0< f1/f2345< -1.6. Therefore, when f1/f2345 satisfies the above relational expression, the resolution capability of the five-piece type wide-angle lens group can be significantly improved while having a large viewing angle, whereas if the data value range of the above optical expression is exceeded, the performance and resolution of the five-piece type wide-angle lens group are low, and the yield is insufficient.
Preferably, a radius of curvature of the image-side surface of the first lens element is R2, a focal length of the first lens element is f1, and the following condition is satisfied: -19.6< R2/f1< 6.7. Therefore, the five-piece wide-angle lens group has the performance of low length, large aperture and high and low-distance scene imaging quality.
Preferably, a radius of curvature of the image-side surface of the first lens element is R2, a radius of curvature of the object-side surface of the first lens element is R1, and the following condition is satisfied: -34.6< R2/R1< 13.5. Therefore, the five-piece wide-angle lens group has a large visual angle function and meets the requirement of miniaturization.
Preferably, a radius of curvature of the object-side surface of the fourth lens element is R7, a radius of curvature of the image-side surface of the fourth lens element is R8, and the following condition is satisfied: 2.2< R7/R8< 17.8. Therefore, the surface shape of the fourth lens element can be balanced, and the symmetry of the five-piece wide-angle lens group can be increased so as to maintain better imaging quality.
Preferably, the thickness of the fourth lens element along the optical axis is CT4, the thickness of the fifth lens element along the optical axis is CT5, and the following conditions are satisfied: 1.3< CT4/CT5< 3.8. Thereby, the five-piece wide-angle lens group is further miniaturized.
Preferably, an axial distance between the object-side surface of the first lens element and the image plane is TL, an overall focal length of the five-piece wide-angle lens assembly is f, and the following conditions are satisfied: 1.9< TL/f < 3.35. Therefore, the five-piece wide-angle lens group can be favorably mounted on a light and thin electronic product, and a wide angle of view (angle of view) can be favorably obtained, and the five-piece wide-angle lens group can be favorably kept miniaturized.
Preferably, a distance between the object-side surface of the first lens element and the image plane on the optical axis is TL, an imaging height of the five-piece type wide-angle lens group on the image plane is IMH, and the following conditions are satisfied: 1.3< TL/IMH < 2.3. Therefore, the balance between the reduction of the volume of the five-piece wide-angle lens group and the increase of the area of the imaging surface can be obtained.
Preferably, an axial distance between the image-side surface of the fifth lens element and the image plane is BFL, an axial distance between the object-side surface of the first lens element and the image plane is TL, and the following conditions are satisfied: 0.14< BFL/TL < 0.27. Therefore, the balance between the reduction of the volume of the five-piece wide-angle lens group and the increase of the area of an imaging surface can be obtained.
Preferably, the second lens has an abbe number of V2, the third lens has an abbe number of V3, and the following conditions are satisfied: 30< V2-V3< 42. Therefore, the second lens and the third lens can be matched with each other to reduce the chromatic aberration of the five-piece type wide-angle lens group.
Preferably, the fourth lens has an abbe number of V4, the fifth lens has an abbe number of V5, and the following conditions are satisfied: 30< V4-V5< 42. Therefore, the fourth lens and the fifth lens can be matched with each other to reduce the chromatic aberration of the five-piece type wide-angle lens group.
Drawings
Fig. 1A is a schematic view of a five-lens wide-angle lens assembly according to a first embodiment of the invention.
Fig. 1B is a graph illustrating the curvature of field and distortion of the image plane of the five-piece wide-angle lens assembly according to the first embodiment of the present invention.
Fig. 2A is a schematic view of a five-lens wide-angle lens assembly according to a second embodiment of the invention.
Fig. 2B is a graph illustrating the curvature of field and the distortion of the image plane of the five-piece wide-angle lens set according to the second embodiment, in order from left to right.
Fig. 3A is a schematic view of a five-lens wide-angle 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-piece wide-angle lens assembly of the third embodiment in order from left to right.
FIG. 4A is a schematic view of a five-lens wide-angle lens assembly according to a fourth embodiment of the present invention.
Fig. 4B is a graph illustrating the curvature of field and distortion of the image plane of the five-piece wide-angle lens assembly of the fourth embodiment in order from left to right.
Fig. 5A is a schematic view of a five-piece wide-angle lens group according to a fifth embodiment of the present invention.
Fig. 5B is a graph illustrating the curvature of field and distortion of the five-piece wide-angle lens set of the fifth embodiment in order from left to right.
Fig. 6A is a schematic view of a five-lens wide-angle lens assembly according to a sixth embodiment of the invention.
Fig. 6B is a graph illustrating the curvature of field and the distortion of the image plane of the five-piece wide-angle lens set according to the sixth embodiment in order from left to right.
Fig. 7A is a schematic view of a five-piece wide-angle lens group according to a seventh embodiment of the present invention.
Fig. 7B is a graph illustrating the curvature of field and distortion of the five-piece wide-angle lens set of the seventh embodiment in order from left to right.
Description of the symbols in the drawings:
100. 200, 300, 400, 500, 600, 700: aperture
110. 210, 310, 410, 510, 610, 710: first lens
111. 211, 311, 411, 511, 611, 711: object side surface
112. 212, 312, 412, 512, 612, 712: surface of image side
120. 220, 320, 420, 520, 620, 720: second lens
121. 221, 321, 421, 521, 621, 721: object side surface
122. 222, 322, 422, 522, 622, 722: surface of image side
130. 230, 330, 430, 530, 630, 730: third lens
131. 231, 331, 431, 531, 631, 731: object side surface
132. 232, 332, 432, 532, 632, 732: surface of image side
140. 240, 340, 440, 540, 640, 740: fourth lens
141. 241, 341, 441, 541, 641, 741: object side surface
142. 242, 342, 442, 542, 642, 742: surface of image side
150. 250, 350, 450, 550, 650, 750: fifth lens element
151. 251, 351, 451, 551, 651, 751: object side surface
152. 252, 352, 452, 552, 652, 752: surface of image side
160. 260, 360, 470, 570, 670, 770: infrared filtering component
180. 280, 380, 480, 580, 680, 780: image plane
190. 290, 390, 490, 590, 690, 790: optical axis
f: focal length of five-piece wide-angle lens group
Fno: aperture value of five-piece wide-angle lens group
FOV: maximum field angle in five-piece wide-angle lens group
f 1: focal length of the first lens
f 2: focal length of the second lens
f 4: focal length of fourth lens
f 23: the combined focal length of the second lens and the third lens
f 45: the combined focal length of the fourth lens and the fifth lens
f 345: the combined focal length of the third lens, the fourth lens and the fifth lens
f 2345: the combined focal length of the second lens, the third lens, the fourth lens and the fifth lens
R1: radius of curvature of object-side surface of first lens
R2: radius of curvature of image-side surface of first lens
R3: radius of curvature of object-side surface of second lens
R4: radius of curvature of image-side surface of second lens
R7: radius of curvature of object-side surface of fourth lens
R8: radius of curvature of image-side surface of fourth lens element
CT 4: thickness of the fourth lens on the optical axis
CT 5: thickness of the fifth lens element on the optical axis
V2: abbe number of second lens
V3: abbe number of third lens
V4: abbe number of fourth lens
V5: abbe number of fifth lens
TL: distance between the object side surface of the first lens element and the image plane on the optical axis
IMH: imaging height of five-piece type wide-angle lens group capable of being captured on imaging surface
BFL: the distance between the image side surface of the fifth 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 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 making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 1A and fig. 1B, fig. 1A is a schematic diagram of a five-piece wide-angle lens assembly according to a first embodiment of the invention, and fig. 1B is a graph of field curvature and distortion aberration of the five-piece wide-angle lens assembly according to the first embodiment of the invention in order from left to right. In fig. 1A, the five-piece wide-angle 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, a fifth lens element 150, an ir-cut filter 160, a cover glass 170, and an image plane 180, wherein five lens elements have refractive power. The diaphragm 100 is disposed between the first lens 110 and the second lens 120.
The first lens element 110 with negative refractive power has an object-side surface 111 being concave at a paraxial region 190 thereof and an image-side surface 112 being concave at a paraxial region 190 thereof, wherein the object-side surface 111 and the image-side surface 112 are aspheric.
The second lens element 120 with positive refractive power has an object-side surface 121 being convex in a paraxial region 190 and an image-side surface 122 being convex 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 both 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 convex in a paraxial region 190 and an image-side surface 152 being concave in 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 wide-angle lens set.
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 … … is a higher order aspheric coefficient.
In the five-piece wide-angle lens assembly of the first embodiment, the focal length of the five-piece wide-angle lens assembly is f, the aperture (f-number) of the five-piece wide-angle lens assembly is Fno, and the maximum field angle (view angle) of the five-piece wide-angle lens assembly is FOV, which is as follows: f 2.09 (mm); fno 2.20; and FOV 124.3 (degrees).
In the first five-lens wide-angle lens assembly of embodiment i, the radius of curvature of the object-side surface 121 of the second lens element 120 is R3, the radius of curvature of the image-side surface 122 of the second lens element 120 is R4, and the total focal length of the five-lens wide-angle lens assembly is f, which satisfies the following conditions: f + (R3+ R4)/(R3-R4) ═ 2.639 millimeters.
In the five-lens wide-angle 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 focal length of the fourth lens element 140 is f4, which satisfies the following conditions: f1/(f2 f4) — 1.736 mm-1。
In the five-piece wide-angle lens assembly of the first embodiment, the overall focal length of the five-piece wide-angle lens assembly is f, the focal length of the first lens element 110 is f1, and the following conditions are satisfied: f/f1 is-0.355.
In the five-piece wide-angle lens assembly of the first embodiment, the combined focal length of the third lens element 130, the fourth lens element 140 and the fifth lens element 150 is f345, and the overall focal length of the five-piece wide-angle lens assembly is f, and the following conditions are satisfied: f 345/f-10.85.
In the five-lens wide-angle lens assembly of the first embodiment, a combined focal length of the second lens element 120 and the third lens element 130 is f23, 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: f23/f45 is 0.464.
In the five-lens wide-angle lens assembly of the first embodiment, the focal length of the first lens element 110 is f1, and the combined focal length of the second lens element 120, the third lens element 130, the fourth lens element 140 and the fifth lens element 150 is f2345, and the following conditions are satisfied: f1/f 2345-3.209.
In the first five-lens wide-angle lens group, the radius of curvature of the image-side surface 112 of the first lens element 110 is R2, the focal length of the first lens element 110 is f1, and the following conditions are satisfied: r2/f1 ═ 5.683.
In the first five-lens wide-angle lens group of embodiment i, the radius of curvature of the image-side surface 112 of the first lens element 110 is R2, the radius of curvature of the object-side surface 111 of the first lens element 110 is R1, and the following condition is satisfied: R2/R1 ═ 9.385.
In the first five-piece wide-angle lens group of embodiment i, the radius of curvature of the object-side surface 141 of the fourth lens element 140 is R7, the radius of curvature of the image-side surface 142 of the fourth lens element 140 is R8, and the following condition is satisfied: R7/R8 is 4.752.
In the first embodiment of the five-lens wide-angle lens assembly, the thickness of the fourth lens element 140 on the optical axis 190 is CT4, the thickness of the fifth lens element 150 on the optical axis 190 is CT5, and the following conditions are satisfied: CT4/CT5 is 2.079.
In the first embodiment of the present invention, a 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, a total focal length of the five-piece wide-angle lens assembly is f, and the following conditions are satisfied: TL/f 2.441.
In the first embodiment of the present invention, a 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, an image height of the five-piece wide-angle lens assembly on the image plane 180 is IMH, and the following conditions are satisfied: TL/IMH ═ 1.675.
In the first embodiment of the present disclosure, a distance between the image-side surface 152 of the fifth lens element 150 and the image plane 180 along the optical axis 190 is BFL, a distance between the object-side surface 111 of the first lens element 110 and the image plane 180 along the optical axis 190 is TL, and the following conditions are satisfied: BFL/TL is 0.214.
In the five-lens wide-angle lens assembly of the first embodiment, the second lens element 120 has an abbe number of V2, the third lens element 130 has an abbe number of V3, and the following conditions are satisfied: V2-V3 ═ 35.5.
In the five-piece wide-angle lens assembly of the first embodiment, the fourth lens element 140 has an abbe number of V4, the fifth lens element 150 has an abbe number of V5, and the following conditions are satisfied: V4-V5 ═ 35.5.
Further, refer to the following Table 1 and Table 2.
Table 1 shows detailed structural data of the embodiment of FIG. 1A, wherein the radius of curvature, the thickness and the focal length are expressed in mm, and surfaces 0-15 sequentially represent surfaces from the object side to the image side. Table 2 shows aspheric data in the first embodiment, wherein k represents the cone coefficient in the aspheric curve equation, and A, B, C, D, E, F, G … represents the higher order aspheric coefficients. 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 is not repeated herein.
Example two:
as shown in fig. 2A and fig. 2B, fig. 2A is a schematic diagram of a five-piece wide-angle lens set according to a second embodiment of the present invention, and fig. 2B is a graph of field curvature and distortion aberration of the five-piece wide-angle lens set according to the second embodiment, in order from left to right. In fig. 2A, the five-piece wide-angle 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 in the five-piece wide-angle lens assembly have refractive power. The diaphragm 200 is disposed between the first lens 210 and the second lens 220.
The first lens element 210 with negative refractive power has an object-side surface 211 being concave at a paraxial region 290 thereof and an image-side surface 212 being convex at a paraxial region 290 thereof, and the object-side surface 211 and the image-side surface 212 are aspheric.
The second lens element 220 with positive refractive power has an object-side surface 221 being convex at a paraxial region 290 thereof and an image-side surface 222 being convex at a paraxial region 290 thereof, wherein 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 convex at a paraxial region 290 and an image-side surface 232 being concave at a paraxial region 290, and both 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 in a paraxial region 290, an image-side surface 242 being convex in a paraxial region 290, and both 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 wide-angle lens set.
Further, the following Table 3 and Table 4 are referred to.
In the second embodiment, the curve equation of the aspherical surface is shown 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:
example three:
as shown in fig. 3A and fig. 3B, fig. 3A is a schematic diagram of a five-piece wide-angle lens assembly according to a third embodiment of the present invention, and fig. 3B is a graph of field curvature and distortion aberration of the five-piece wide-angle lens assembly according to the third embodiment of the present invention, in order from left to right. In fig. 3A, the five-piece wide-angle 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 in the five-piece wide-angle lens assembly have refractive power. The diaphragm 300 is disposed between the first lens 310 and the second lens 320.
The first lens element 310 with negative refractive power has an object-side surface 311 being concave at a paraxial region 390, an image-side surface 312 being convex 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 positive refractive power has an object-side surface 321 being convex at a paraxial region 390, and an image-side surface 322 being convex 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 negative refractive power has an object-side surface 331 being convex at a paraxial region 390, an image-side surface 332 being concave 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 positive refractive power has an object-side surface 341 being concave at a paraxial region 390, an image-side surface 342 being convex at a paraxial region 390, and both the object-side surface 341 and the image-side surface 342 being aspheric.
The fifth lens element 350 with negative refractive power has an object-side surface 351 being convex in a paraxial region 390, an image-side surface 352 being concave in a paraxial region 390, the object-side surface 351 and the image-side surface 352 being 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 is disposed between the fifth lens element 350 and the image plane 380 without affecting the focal length of the five-piece wide-angle lens set.
Further, the following Table 5 and Table 6 were referred to.
In the third embodiment, the curve equation of the aspherical surface is expressed 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:
example four:
as shown in fig. 4A and 4B, fig. 4A is a schematic diagram of a five-piece wide angle lens assembly according to a fourth embodiment of the present invention, and fig. 4B is a graph of field curvature and distortion aberration curves of the five-piece wide angle lens assembly according to the fourth embodiment of the present invention. In fig. 4A, the five-piece wide-angle 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, a fifth lens element 450, an ir-cut filter 470 and an image plane 480, wherein five lens elements in the five-piece wide-angle lens assembly have refractive power. The diaphragm 400 is disposed between the first lens 410 and the second lens 420.
The first lens element 410 with negative refractive power has an object-side surface 411 being concave at a paraxial region 490 thereof and an image-side surface 412 being convex at a paraxial region 490 thereof, and the object-side surface 411 and the image-side surface 412 are aspheric.
The second lens element 420 with positive refractive power has an object-side surface 421 being convex at a paraxial region 490 thereof and an image-side surface 422 being convex at a paraxial region 490 thereof, wherein the object-side surface 421 and the image-side surface 422 are aspheric.
The third lens element 430 with negative refractive power has an object-side surface 431 being convex at a paraxial region 490 thereof and an image-side surface 432 being concave 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 positive 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 the paraxial region 490 thereof, wherein the fourth lens element 440 is made of plastic material and both the object-side surface 441 and the image-side surface 442 are aspheric.
The fifth lens element 450 with negative refractive power has an object-side surface 451 being convex at a paraxial region 490 thereof and an image-side surface 452 being concave at a paraxial region 490 thereof, wherein the object-side surface 451 and the image-side surface 452 are aspheric, and at least one of the object-side surface 451 and the image-side surface 452 has at least one inflection point.
The ir-cut filter 470 is made of glass, and is disposed between the fifth lens element 450 and the image plane 480 without affecting the focal length of the five-piece wide-angle lens set.
Further, the following Table 7 and Table 8 are referred to.
In the fourth embodiment, the curve equation of the aspherical surface is expressed 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:
example five:
as shown in fig. 5A and 5B, fig. 5A is a schematic view of a five-piece type wide-angle lens set according to a fifth embodiment of the present invention, and fig. 5B is a graph of curvature of field and distortion aberration of the five-piece type wide-angle lens set according to the fifth embodiment, in order from left to right. In fig. 5A, the five-piece wide-angle 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, a fifth lens element 550, an ir-cut filter 570 and an image plane 580, wherein five lens elements in the five-piece wide-angle lens assembly have refractive power. The diaphragm 500 is disposed between the first lens 510 and the second lens 520.
The first lens element 510 with negative refractive power has an object-side surface 511 being convex in a paraxial region 590, an image-side surface 512 being concave in the paraxial region 590, and both the object-side surface 511 and the image-side surface 512 being aspheric.
The second lens element 520 with positive refractive power has an object-side surface 521 being convex in a paraxial region 590, and an image-side surface 522 being convex in a paraxial region 590, and the object-side surface 521 and the image-side surface 522 are aspheric.
The third lens element 530 with negative refractive power has an object-side surface 531 being convex at a paraxial region 590 and an image-side surface 532 being concave 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 positive refractive power has an object-side surface 541 being concave in a paraxial region 590, an image-side surface 542 being convex in a paraxial region 590, and both the object-side surface 541 and the image-side surface 542 being aspheric.
The fifth lens element 550 with negative refractive power has an object-side surface 551 being convex in a paraxial region 590, an image-side surface 552 being concave in a paraxial region 590, the object-side surface 551 and the image-side surface 552 being aspheric, and at least one of the object-side surface 551 and the image-side surface 552 has at least one inflection point.
The ir-cut filter 570 is made of glass, and is disposed between the fifth lens element 550 and the image plane 580 without affecting the focal length of the five-piece wide-angle lens set.
Further, the following table 9 and table 10 are referred to.
In the fifth embodiment, the curve equation of the aspherical surface is expressed 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:
example six:
as shown in fig. 6A and 6B, fig. 6A is a schematic diagram of a five-piece wide-angle lens assembly according to a sixth embodiment of the present invention, and fig. 6B is a graph of field curvature and distortion aberration of the five-piece wide-angle lens assembly according to the sixth embodiment, in order from left to right. In fig. 6A, the five-piece wide-angle 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, a fifth lens element 650, an ir-cut filter element 670 and an image plane 680, wherein five lens elements in the five-piece wide-angle lens assembly have refractive power. The diaphragm 600 is disposed between the first lens 610 and the second lens 620.
The first lens element 610 with negative refractive power has an object-side surface 611 being concave at a paraxial region 690 and an image-side surface 612 being convex at a paraxial region 690, and is made of plastic material, wherein the object-side surface 611 and the image-side surface 612 are aspheric.
The second lens element 620 with positive refractive power has an object-side surface 621 being convex in a paraxial region 690 thereof and an image-side surface 622 being convex 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 negative refractive power has an object-side surface 631 being convex in a paraxial region 690 and an image-side surface 632 being concave in a paraxial region 690, wherein the object-side surface 631 and the image-side surface 632 are aspheric.
The fourth lens element 640 with positive refractive power has an object-side surface 641 being concave in a paraxial region 690 thereof, an image-side surface 642 being convex in a paraxial region 690 thereof, and the object-side surface 641 and the image-side surface 642 being aspheric.
The fifth lens element 650 with negative refractive power is made of plastic material, and has an object-side surface 651 being convex at a paraxial region 690 and an image-side surface 652 being concave at a paraxial region 690, wherein the object-side surface 651 and the image-side surface 652 are aspheric, and at least one of the object-side surface 651 and the image-side surface 652 has at least one inflection point.
The ir-cut filter 670 is made of glass, and is disposed between the fifth lens element 650 and the image plane 680 without affecting the focal length of the five-piece wide-angle lens set.
Further, the following table 11 and table 12 are referred to.
In a sixth embodiment, the aspheric curve equation is in the form of 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:
example seven:
referring to fig. 7A and 7B, fig. 7A is a schematic diagram of a five-piece wide-angle lens assembly according to a seventh embodiment of the invention, and fig. 7B is a graph of field curvature and distortion aberration of the five-piece wide-angle lens assembly according to the seventh embodiment, in order from left to right. In fig. 7A, the five-piece wide-angle lens assembly includes an aperture stop 700 and an optical assembly including, in order from an object side to an image side, a first lens element 710, a second lens element 720, a third lens element 730, a fourth lens element 740, a fifth lens element 750, an ir-cut filter 770 and an image plane 780, wherein five lens elements in the five-piece wide-angle lens assembly have refractive power. The diaphragm 700 is disposed between the first lens 710 and the second lens 720.
The first lens element 710 with negative refractive power has an object-side surface 711 being concave at a paraxial region 790, an image-side surface 712 being concave at a paraxial region 790, and both the object-side surface 711 and the image-side surface 712 being aspheric.
The second lens element 720 with positive refractive power has an object-side surface 721 being convex at a paraxial region 790, an image-side surface 722 being convex at a paraxial region 790, and both the object-side surface 721 and the image-side surface 722 being aspheric.
The third lens element 730 with negative refractive power has an object-side surface 731 being convex in a paraxial region 790, an image-side surface 732 being concave in a paraxial region 790, and both the object-side surface 731 and the image-side surface 732 being aspheric.
The fourth lens element 740 with positive refractive power has an object-side surface 741 being concave at a paraxial region 790, an image-side surface 742 being convex at the paraxial region 790, and both the object-side surface 741 and the image-side surface 742 are aspheric.
The fifth lens element 750 with negative refractive power is made of plastic material, and has an object-side surface 751 which is convex at a paraxial region 790, an image-side surface 752 which is concave at a paraxial region 790, wherein the object-side surface 751 and the image-side surface 752 are aspheric, and at least one of the object-side surface 751 and the image-side surface 752 has at least one inflection point.
The ir-cut filter 770 is made of glass and disposed between the fifth lens element 750 and the image plane 780 without affecting the focal length of the five-piece wide-angle lens set.
Further, the following table 13 and table 14 are referred to.
In example seven, the curve equation for the aspheric surface is in the form of example one. 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 the coordination tables 13 and 14:
in the five-piece wide-angle 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 five-piece wide-angle 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 wide-angle lens group can be aspheric surfaces, 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 reduce the number of the lenses, and therefore, the total length of the five-piece wide-angle lens group can be effectively reduced.
In the five-lens wide-angle 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 the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at the paraxial region.
The five-piece wide-angle 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 (13)
1. A five-lens wide-angle lens assembly comprising an aperture stop and an optical assembly comprising five lens elements, in order from an object side to an image side:
the first 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 first lens element is aspheric;
the aperture;
the second lens element with positive refractive power has an object-side surface being convex 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 second lens element is aspheric;
the third lens element with negative 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 third lens element is aspheric;
the fourth 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 fourth lens element is aspheric; and
a fifth lens element with negative refractive power having a convex object-side surface and a concave image-side surface, wherein at least one of the object-side surface and the image-side surface of the fifth lens element is aspheric, and the at least one of the object-side surface and the image-side surface of the fifth lens element has at least one inflection point;
wherein a radius of curvature of the image-side surface of the first lens element is R2, a radius of curvature of the object-side surface of the second lens element is R3, a radius of curvature of the image-side surface of the second lens element is R4, a focal length of the five-piece wide-angle lens assembly is f, a focal length of the first lens element is f1, a focal length of the second lens element is f2, and a focal length of the fourth lens element is f4, and the following conditions are satisfied:
2.581 mm ≦ f + (R3+ R4)/(R3-R4) ≦ 2.639 mm, and-2.0 mm-1< f1/(f2*f4)<1.2 mm-1And simultaneously contains-19.6<R2/f1 ≦ 5.683 or-0.407 ≦ R2/f1 ≦ 3.345.
2. The five-piece wide angle lens group of claim 1, wherein the overall focal length of said five-piece wide angle lens group is f, and the focal length of said first lens element is f1, wherein the following conditions are satisfied: -0.68< f/f1< -0.26.
3. The five-piece wide angle lens assembly of claim 1, wherein the combined focal length of the third, fourth and fifth lenses is f345, and the overall focal length of the five-piece wide angle lens assembly is f, wherein the following conditions are satisfied: -13.0< f345/f < 28.5.
4. The five-piece wide-angle lens group of claim 1, wherein the combined focal length of the second and third lenses is f23, and the combined focal length of the fourth and fifth lenses is f45, wherein the following conditions are satisfied: 0.29< f23/f45< 0.87.
5. The five-piece wide-angle lens group of claim 1, wherein the first lens element has a focal length of f1, and the combined focal length of the second, third, fourth and fifth lens elements is f2345, wherein the following conditions are satisfied: -4.0< f1/f2345< -1.6.
6. The five-piece wide-angle lens group of claim 1, wherein the radius of curvature of the image-side surface of the first lens element is R2, and the radius of curvature of the object-side surface of the first lens element is R1, wherein: -34.6< R2/R1< 13.5.
7. The five-piece wide-angle lens group of claim 1, wherein the fourth lens element has an object-side surface with a radius of curvature R7 and an image-side surface with a radius of curvature R8, wherein the following conditions are satisfied: 2.2< R7/R8< 17.8.
8. The five-piece wide-angle lens assembly of claim 1, wherein the fourth lens element has an axial thickness of CT4, and the fifth lens element has an axial thickness of CT5, wherein the following conditions are satisfied: 1.3< CT4/CT5< 3.8.
9. The five-piece wide-angle lens assembly of claim 1, wherein the distance from the object-side surface of the first lens element to the image plane is TL, the overall focal length of the five-piece wide-angle lens assembly is f, and the following conditions are satisfied: 1.9< TL/f < 3.35.
10. The five-piece wide-angle lens assembly of claim 1, wherein the distance from the object-side surface of the first lens element to the image plane is TL, the height of the five-piece wide-angle lens assembly captured at the image plane is IMH, and the following conditions are satisfied: 1.3< TL/IMH < 2.3.
11. The five-piece wide-angle lens assembly of claim 1, wherein an axial distance between the image-side surface of the fifth lens element and the image plane is BFL, an axial distance between the object-side surface of the first lens element and the image plane is TL, and wherein the following conditions are satisfied: 0.14< BFL/TL < 0.27.
12. The five-piece wide-angle lens group of claim 1, wherein the second lens element has an abbe number of V2 and the third lens element has an abbe number of V3, and wherein the following conditions are satisfied: 30< V2-V3< 42.
13. The five-piece wide-angle lens group of claim 1, wherein the fourth lens element has an abbe number of V4, and the fifth lens element has an abbe number of V5, and the following conditions are satisfied: 30< V4-V5< 42.
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| TWI534470B (en) * | 2013-10-03 | 2016-05-21 | 光燿科技股份有限公司 | Wide-angle image taking lens system |
| EP3171211B1 (en) * | 2014-07-15 | 2019-08-14 | Zhejiang Sunny Optics Co., Ltd. | Camera lens |
| TWI611204B (en) * | 2015-12-15 | 2018-01-11 | 大立光電股份有限公司 | Imaging lens assembly, image capturing apparatus and electronic device |
| TWI601994B (en) * | 2015-12-15 | 2017-10-11 | 大立光電股份有限公司 | Imaging optical lens assembly, image capturing apparatus and electronic device |
| TWI656374B (en) * | 2017-05-26 | 2019-04-11 | 大立光電股份有限公司 | Optical image capturing lens group, image capturing device and electronic device |
| CN109085694B (en) * | 2017-06-13 | 2021-08-13 | 新巨科技股份有限公司 | Five-piece type wide-angle lens group |
| CN109116523B (en) * | 2017-06-26 | 2020-11-17 | 新巨科技股份有限公司 | Five-piece type wide-angle lens group |
| TWI678572B (en) * | 2017-08-21 | 2019-12-01 | 鴻海精密工業股份有限公司 | Image pickup lens |
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