CN108614346B - Six-piece wide-angle lens group - Google Patents
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- CN108614346B CN108614346B CN201611149495.XA CN201611149495A CN108614346B CN 108614346 B CN108614346 B CN 108614346B CN 201611149495 A CN201611149495 A CN 201611149495A CN 108614346 B CN108614346 B CN 108614346B
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- G—PHYSICS
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- 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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- G—PHYSICS
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Abstract
The invention discloses a six-piece wide-angle lens group, which comprises the following components in sequence from an object side to an image side: a first lens element with negative refractive power; a second lens element with positive refractive power; an aperture; a third lens element with positive refractive power; a fourth lens element with negative refractive power; a fifth lens element with positive refractive power; a sixth lens element with negative refractive power; the third lens element, the fourth lens element, the fifth lens element and the sixth lens element have abbe numbers V3, V4, V5 and V6, respectively, a total focal length f of the six-piece wide-angle lens assembly, a distance TL from an object-side surface of the first lens element to an image plane on an optical axis, and satisfy the following conditions: 29< V3-V4< 42; 29< V5-V6< 42; 0.1< f/TL < 0.4. The purpose of improving the drawing angle, having the capability of simultaneously shooting visible light wave band and infrared single wave band, having high resolution capability, short lens length and small distortion is achieved.
Description
Technical Field
The invention relates to a wide-angle lens group, in particular to a miniaturized six-piece wide-angle lens group applied to an electronic product.
Background
With the rise of electronic products with a photographing function, the demand of optical systems is increasing. In order to obtain a wide shooting range in shooting, the angle of view of the lens is required to meet certain requirements, and thus the requirements for the shooting angle and the image quality of the lens are becoming stricter. In general, the field angle (FOV) of the lens is designed to be 50 to 60 degrees, and if the field angle exceeds the designed angle, not only is the aberration large, but also the design of the lens is complicated. Conventionally, US 8335043 and US 8576497 use 2 lens groups, 5-6 lens groups for achieving the purpose of large angle, but the distortion (distortion) is too large, and US 8593737, US 8576497 and US8395853 for achieving the purpose of large angle, but the Total Length (TL) of the lens group is too long.
Therefore, how to develop a miniaturized wide-angle lens set, which not only can be configured in electronic products such as a lens used by a digital camera, a lens used by a network camera, or a mobile phone lens, but also has the effects of having a larger drawing angle, having the capability of simultaneously shooting a visible light band and an infrared single-wavelength slope band, and reducing aberration, so as to reduce the complexity of lens design, namely the motivation for research and development of the invention.
Disclosure of Invention
The present invention provides a six-piece wide-angle lens set, and more particularly, to a wide-angle lens set with improved view angle, simultaneous image capturing capability in both visible and infrared single-wavelength slopes, high resolution, short lens length, and small distortion.
To achieve the above object, the present invention provides a six-lens wide-angle lens assembly, in order from an object side to an image side, comprising: a first 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 second lens element with positive refractive power having an object-side surface being convex at a paraxial region thereof and an image-side surface being convex at a paraxial region thereof, wherein at least one of the object-side surface and the image-side surface thereof is aspheric; an aperture; a third lens element with positive refractive power having an object-side surface being convex at a paraxial region thereof and an image-side surface being convex at a paraxial region thereof, wherein at least one of the object-side surface and the image-side surface is aspheric; a fourth 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 fifth lens element with positive refractive power having an object-side surface being convex at a paraxial region and an image-side surface being convex at a paraxial region, at least one of the object-side surface and the image-side surface being aspheric; a sixth 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, and at least one of the object-side surface and the image-side surface having at least one inflection point;
wherein an abbe number of the third lens element is V3, an abbe number of the fourth lens element is V4, an abbe number of the fifth lens element is V5, an abbe number of the sixth lens element is V6, a total focal length of the six-piece wide-angle lens assembly is f, a distance between an object-side surface of the first lens element and an image plane on an optical axis is TL, and the following conditions are satisfied: 29< V3-V4< 42; 29< V5-V6< 42; 0.1< f/TL < 0.4.
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: -0.5< f1/f2< -0.2. 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 third lens is f3, and the following conditions are satisfied: 4.0< f2/f3< 7.0. Therefore, the refractive power of the third lens element can be effectively distributed, and the refractive power of the third lens element is not too large, thereby facilitating the reduction of system sensitivity and the reduction of aberration.
Preferably, the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the following conditions are satisfied: -1.05< f3/f4< -0.7. Therefore, the arrangement of the refractive power can be effectively balanced to strengthen and correct the aberration of the wide-angle lens group.
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: -1.2< f4/f5< -0.8. Therefore, the chromatic aberration of the image lens assembly can be balanced, and the imaging quality is improved.
Preferably, the focal length of the fifth lens element is f5, the focal length of the sixth lens element is f6, and the following conditions are satisfied: -0.7< f5/f6< -0.35. Therefore, the refractive power configuration of the rear group lens system is balanced, and the reduction of the system sensitivity and the correction of the high-order aberration are facilitated.
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: -2.1< f1/f3< -1.5. Therefore, the refractive power of the first lens element is effectively distributed, and the sensitivity of the six-lens wide-angle lens assembly is reduced.
Preferably, the focal length of the second lens is f2, the focal length of the fourth lens is f4, and the following conditions are satisfied: -6.0< f2/f4< -3.5. Therefore, the large-view angle and large-aperture characteristics of the six-piece wide-angle lens group are improved, the sensitivity of the six-piece wide-angle lens group can be reduced, the manufacture of each lens is facilitated, and the production yield is improved.
Preferably, the focal length of the third lens is f3, the focal length of the fifth lens is f5, and the following conditions are satisfied: 0.65< f3/f5< 1.1. Therefore, the large-view angle and large-aperture characteristics of the six-piece wide-angle lens group are improved, the sensitivity of the six-piece wide-angle lens group can be reduced, the manufacture of each lens is facilitated, and the production yield is improved.
Preferably, the focal length of the fourth lens element is f4, the focal length of the sixth lens element is f6, and the following conditions are satisfied: 0.4< f4/f6< 0.75. Therefore, the sensitivity of the six-piece wide-angle lens set can be reduced, and the total track length thereof can be effectively shortened.
Preferably, the focal length of the first lens and the second lens is f12, the focal length of the third lens is f3, and the following conditions are satisfied: -4.2< f12/f3< -2.8. Therefore, when f12/f3 satisfies the above condition, the resolution of the six-piece wide-angle lens assembly can be significantly improved while a wide field of view (field angle) is obtained.
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: -0.95< f23/f4< -0.67. Therefore, the large-view angle and large-aperture characteristics of the six-piece wide-angle lens group are improved, the sensitivity of the six-piece wide-angle lens group can be reduced, the manufacture of each lens is facilitated, and the production yield is improved.
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: 0.05< f23/f45< 0.5. When f23/f45 satisfies the above relation, the resolution capability of the six-piece wide-angle lens set can be significantly improved while having a large drawing angle, a high drawing number and a low lens height, whereas if the resolution capability exceeds the data value range of the above optical formula, the performance and resolution capability of the six-piece wide-angle lens set are low, and the yield is insufficient.
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: -1.65< f12/f34< -1.0. When f12/f34 satisfies the above relation, the resolution capability of the six-piece wide-angle lens set can be significantly improved while having a large drawing angle, a high drawing number and a low lens height, whereas if the resolution capability exceeds the data value range of the above optical formula, the performance and resolution capability of the six-piece wide-angle lens set are low, and the yield is insufficient.
Preferably, a combined focal length of the third lens element and the fourth lens element is f34, a combined focal length of the fifth lens element and the sixth lens element is f56, and the following conditions are satisfied: 1.0< f34/f56< 2.4. When f34/f56 satisfies the above relation, the resolution capability of the six-piece wide-angle lens set can be significantly improved while having a large drawing angle, a high drawing number and a low lens height, whereas if the resolution capability exceeds the data value range of the above optical formula, the performance and resolution capability of the six-piece wide-angle lens set are low, and the yield is insufficient.
Preferably, a focal length of the fourth lens element is f45, a focal length of the sixth lens element is f6, and the following conditions are satisfied: -1.4< f45/f6< -2.5. When f45/f6 satisfies the above relation, the resolution capability of the six-piece wide-angle lens set can be significantly improved while having a large drawing angle, a high drawing number and a low lens height, whereas if the resolution capability exceeds the data value range of the above optical formula, the performance and resolution capability of the six-piece wide-angle lens set are low, and the yield is insufficient.
Preferably, the focal length of the first lens element is f1, the combined focal length of the second lens element, the third lens element and the fourth lens element is f234, and the following conditions are satisfied: -1.3< f1/f234< -0.8. 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: 1.0< f234/f5< 2.0. By proper configuration of the refractive power, the spherical aberration and astigmatism can be reduced.
Preferably, a combined focal length of the second lens element, the third lens element and the fourth lens element is f234, and a combined focal length of the fifth lens element and the sixth lens element is f56, and the following conditions are satisfied: 0.8< f234/f56< 1.4. 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: -0.9< f123/f4< -0.5. 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: 0.05< f123/f45< 0.4. When f123/f45 satisfies the above relation, the resolution capability of the six-piece wide-angle lens set can be significantly improved while having a large drawing angle, a high drawing number and a low lens height, whereas if the resolution capability exceeds the data value range of the above optical formula, the performance and resolution capability of the six-piece wide-angle lens set are low, and the yield is insufficient.
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, the fifth lens element and the sixth lens element is f456, and the following conditions are satisfied: -0.5< f123/f456< -0.05. When f123/f456 satisfies the above relation, the resolution capability of the six-piece wide-angle lens group can be significantly improved while having a large drawing angle, a high drawing number, and a low lens height, whereas if the resolution capability exceeds the data value range of the optical formula, the performance and resolution capability of the six-piece wide-angle lens group are low, and the yield is insufficient.
To achieve the above objects, the present invention provides four preferred embodiments, which are illustrated in the accompanying drawings.
Drawings
Fig. 1A is a schematic view of a six-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 six-piece wide-angle lens assembly according to the first embodiment, in order from left to right.
Fig. 2A is a schematic view of a six-lens wide-angle lens assembly according to a second embodiment of the invention.
Fig. 2B is a graph illustrating the curvature of field and distortion of the image plane of the six-piece wide-angle lens assembly of the second embodiment in order from left to right.
Fig. 3A is a schematic view of a six-lens wide-angle lens assembly according to a third embodiment of the invention.
FIG. 3B is a graph showing the curvature of field and distortion of the image plane of the six-piece wide-angle lens assembly of the third embodiment in order from left to right.
Fig. 4A is a schematic view of a six-lens wide-angle lens assembly according to a fourth embodiment of the invention.
FIG. 4B is a graph showing the curvature of field and distortion of the image plane of the six-piece wide-angle lens assembly of the fourth embodiment in order from left to right.
Description of the symbols in the drawings:
100. 200, 300, 400: aperture
110. 210, 310, 410: first lens
111. 211, 311, 411: object side surface
112. 212, 312, 412: surface of image side
120. 220, 320, 420: second lens
121. 221, 321, 421: object side surface
122. 222, 322, 422: surface of image side
130. 230, 330, 430: third lens
131. 231, 331, 431: object side surface
132. 232, 332, 432: surface of image side
140. 240, 340, 440: fourth lens
141. 241, 341, 441: object side surface
142. 242, 342, 442: surface of image side
150. 250, 350, 450: fifth lens element
151. 251, 351, 451: object side surface
152. 252, 352, 452: surface of image side
160. 260, 360, 460: sixth lens element
161. 261, 361, 461: object side surface
162. 262, 362, 462: surface of image side
270. 470: visible and infrared single wavelength band filter components 180, 280, 380, 480: image plane
190. 290, 390, 490: optical axis
f: focal length of six-piece wide-angle lens group
Fno: aperture value of six-piece wide-angle lens group
FOV: maximum field angle in six-piece wide-angle 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 6: focal length of sixth 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 56: the combined focal length of the fifth lens and the sixth 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
f 456: the combined focal length of the fourth lens, the fifth lens and the sixth lens
V3: abbe number of third lens
V4: abbe number of fourth lens
V5: abbe number of fifth lens
V6: abbe number of sixth 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.
Example one
Referring to fig. 1A and fig. 1B, in which fig. 1A is a schematic diagram of a six-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 six-piece wide-angle lens assembly according to the first embodiment, in order from left to right. In fig. 1A, the six-piece wide-angle lens group includes an aperture stop 100 and an optical group 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, a sixth lens element 160 and an image plane 180, wherein six lens elements have refractive power. The aperture stop 100 is disposed between the image-side surface 122 of the second lens element 120 and the image-side surface 132 of the third lens element 130.
The first lens element 110 with negative refractive power has an object-side surface 111 being convex at a paraxial region 190 and an image-side surface 112 being concave at a paraxial region 190, and the object-side surface 111 and the image-side surface 112 are aspheric.
The second lens element 120 with positive refractive power has an object-side surface 121 being convex at a paraxial region 190 and an image-side surface 122 being convex at a paraxial region 190, and both the object-side surface 121 and the image-side surface 122 are aspheric.
The third lens element 130 with positive refractive power has an object-side surface 131 being convex at a paraxial region 190 and an image-side surface 132 being convex at a paraxial region 190, wherein the third lens element 130 is made of plastic material, and both the object-side surface 131 and the image-side surface 132 are aspheric.
The fourth lens element 140 with negative refractive power has an object-side surface 141 being concave at a paraxial region 190 and an image-side surface 142 being concave at a paraxial region 190, and the object-side surface 141 and the image-side surface 142 are aspheric.
The fifth lens element 150 with positive refractive power has an object-side surface 151 being convex at a paraxial region 190 and an image-side surface 152 being convex at a paraxial region 190, wherein the fifth lens element 150 is made of plastic material, and both the object-side surface 151 and the image-side surface 152 are aspheric.
The sixth lens element 160 with negative refractive power has an object-side surface 161 being convex at a paraxial region 190 and an image-side surface 162 being concave at a paraxial region 190, wherein the object-side surface 161 and the image-side surface 162 are aspheric, and at least one of the object-side surface 161 and the image-side surface 162 has at least one inflection point.
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 six-piece wide-angle lens assembly of the first embodiment, the focal length of the six-piece wide-angle lens assembly is f, the aperture value (f-number) of the six-piece wide-angle lens assembly is Fno, and the maximum field of view of the six-piece wide-angle lens assembly is FOV, which has the following values: 1.924 (millimeters); fno 2.0; and FOV 103 (degrees).
In the sixth lens element of the first embodiment, the focal length of the first lens element 110 is f1, the focal length of the second lens element 120 is f2, and the following conditions are satisfied: f1/f2 is-0.39.
In the sixth lens element of the first embodiment, the focal length of the second lens element 120 is f2, and the focal length of the third lens element 130 is f3, and the following conditions are satisfied: f2/f3 is 4.49.
In the sixth lens element of the first embodiment, the focal length of the third lens element 130 is f3, the focal length of the fourth lens element 140 is f4, and the following conditions are satisfied: f3/f4 is-0.89.
In the sixth lens element 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-1.05.
In the sixth lens element of the first embodiment, the focal length of the fifth lens element 150 is f5, the focal length of the sixth lens element 160 is f6, and the following conditions are satisfied: f5/f6 is-0.58.
In the sixth lens element 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-1.73.
In the sixth lens element 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-4.02.
In the sixth lens element of the first embodiment, the focal length of the third lens element 130 is f3, the focal length of the fifth lens element 150 is f5, and the following conditions are satisfied: f3/f5 is 0.94.
In the sixth lens element of the first embodiment, the focal length of the fourth lens element 140 is f4, the focal length of the sixth lens element 160 is f6, and the following conditions are satisfied: f4/f6 is 0.60.
In the sixth lens element of the first embodiment, the combined focal length of the first lens element 110 and the second lens element 120 is f12, the focal length of the third lens element 130 is f3, and the following conditions are satisfied: f12/f3 is-3.68.
In the sixth lens element of the first embodiment, the combined focal length of the second lens element 120 and the third lens element 130 is f23, the focal length of the fourth lens element 140 is f4, and the following conditions are satisfied: f23/f4 is-0.82.
In the sixth lens element 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 0.30.
In the sixth lens element of the first embodiment, a combined focal length of the first lens element 110 and the second lens element 120 is f12, and a combined focal length of the third lens element 130 and the fourth lens element 140 is f34, and the following conditions are satisfied: f12/f34 is-1.29.
In the sixth lens element of the first embodiment, a combined focal length of the third lens element 130 and the fourth lens element 140 is f34, a combined focal length of the fifth lens element 150 and the sixth lens element 160 is f56, and the following conditions are satisfied: f34/f56 is 2.05.
In the sixth lens element of the first embodiment, the combined focal length of the fourth lens element 140 and the fifth lens element 150 is f45, the focal length of the sixth lens element 160 is f6, and the following conditions are satisfied: f45/f6 is-1.64.
In the sixth lens assembly of the first embodiment, the focal length of the first lens element 110 is f1, and the combined focal length of the second lens element 120, the third lens element 130 and the fourth lens element 140 is f234, and the following conditions are satisfied: f1/f234 is-1.01.
In the sixth lens element 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, and a focal length of the fifth lens element 150 is f5, and the following conditions are satisfied: f234/f5 is 1.62.
In the sixth lens element 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, and a combined focal length of the fifth lens element 150 and the sixth lens element 160 is f56, and the following conditions are satisfied: f234/f56 is 1.23.
In the sixth lens element of the first embodiment, the combined focal length of the first lens element 110, the second lens element 120 and the third lens element 130 is f123, and the focal length of the fourth lens element 140 is f4, and the following conditions are satisfied: f123/f4 is-0.71.
In the sixth lens element 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 0.26.
In the sixth lens element 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, the fifth lens element 150 and the sixth lens element 160 is f456, and the following conditions are satisfied: f123/f456 is-0.21.
In the sixth wide-angle lens assembly of the first embodiment, the third lens element 130 has an abbe number of V3, and the fourth lens element 140 has an abbe number of V4, and the following conditions are satisfied: V3-V4 ═ 32.1.
In the sixth wide-angle lens assembly of the first embodiment, the abbe number of the fifth lens element 150 is V5, the abbe number of the sixth lens element 160 is V6, and the following conditions are satisfied: V5-V6 ═ 32.1.
In the first embodiment of the present invention, a total focal length of the six-piece wide angle lens assembly is f, 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, and the following conditions are satisfied: f/TL is 0.23.
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 coefficients in the aspheric curve equation, and A, B, C, D and … … represent the higher-order aspheric coefficients. In addition, the following tables of the embodiments correspond to the schematic diagrams and the field curvature graphs of the embodiments, and the definitions of the data in the tables are the same as those in tables 1 and 2 of the first embodiment, which is not repeated herein.
Example two
Referring to fig. 2A and fig. 2B, fig. 2A is a schematic diagram of a six-piece wide-angle lens assembly according to a second embodiment of the disclosure, and fig. 2B is a graph of field curvature and distortion aberration of the six-piece wide-angle lens assembly according to the second embodiment, in order from left to right. In fig. 2A, the six-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, a sixth lens element 260, a visible light band and infrared single-wavelength band filter 270, and an image plane 280, wherein six lens elements have refractive power. The aperture stop 200 is disposed between an image-side surface 222 of the second lens element 220 and an image-side surface 232 of the third lens element 230.
The first lens element 210 with negative refractive power has an object-side surface 211 being convex at a paraxial region 290 and an image-side surface 212 being concave at a paraxial region 290, and the object-side surface 211 and the image-side surface 212 are aspheric.
The second lens element 220 with positive refractive power has an object-side surface 221 being convex at a paraxial region 290 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 positive refractive power has an object-side surface 231 being convex at a paraxial region 290 and an image-side surface 232 being convex at a paraxial region 290, and is made of plastic material, wherein the object-side surface 231 and the image-side surface 232 are aspheric.
The fourth lens element 240 with negative refractive power has an object-side surface 241 being concave at a paraxial region 290 thereof and an image-side surface 242 being concave 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 positive refractive power has an object-side surface 251 being convex at a paraxial region 290 and an image-side surface 252 being convex at a paraxial region 290, wherein the object-side surface 251 and the image-side surface 252 are aspheric.
The sixth lens element 260 with negative refractive power has an object-side surface 261 being convex at a paraxial region 290 and an image-side surface 262 being concave at a paraxial region 290, wherein the object-side surface 261 and the image-side surface 262 are aspheric and at least one of the object-side surface 261 and the image-side surface 262 has at least one inflection point.
The visible light band and infrared single wavelength band filtering component 270 is made of glass material, and is disposed between the sixth lens 260 and the imaging plane 280 without affecting the focal length of the six-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 III
Referring to fig. 3A and fig. 3B, fig. 3A is a schematic diagram of a six-piece wide-angle lens assembly according to a third embodiment of the disclosure, and fig. 3B is a graph of field curvature and distortion aberration of the six-piece wide-angle lens assembly according to the third embodiment, in order from left to right. In fig. 3A, the six-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, a sixth lens element 360 and an image plane 380, wherein six lens elements have refractive power. The aperture stop 300 is disposed between the image-side surface 322 of the second lens element 320 and the image-side surface 332 of the third lens element 330.
The first lens element 310 with negative refractive power has an object-side surface 311 being convex at a paraxial region 390, and an image-side surface 312 being concave at a paraxial region 390, wherein the object-side surface 311 and the image-side surface 312 are aspheric.
The second lens element 320 with positive refractive power has an object-side surface 321 being convex at a paraxial region 390, and an image-side surface 322 being 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 positive refractive power has an object-side surface 331 being convex at a paraxial region 390 and an image-side surface 332 being convex at a paraxial region 390, and the object-side surface 331 and the image-side surface 332 are aspheric.
The fourth lens element 340 with negative refractive power has an object-side surface 341 being concave in a paraxial region 390 thereof and an image-side surface 342 being concave in a paraxial region 390 thereof, and the object-side surface 341 and the image-side surface 342 are both aspheric.
The fifth lens element 350 with positive refractive power has an object-side surface 351 being convex at a paraxial region 390 and an image-side surface 352 being convex at a paraxial region 390, and the object-side surface 351 and the image-side surface 352 are aspheric.
The sixth lens element 360 with negative refractive power has an object-side surface 361 being convex at a paraxial region 390 thereof and an image-side surface 362 being concave at the paraxial region 390 thereof, wherein the object-side surface 361 and the image-side surface 362 are aspheric, and the object-side surface 361 and the image-side surface 362 have at least one inflection point.
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
Referring to fig. 4A and fig. 4B, fig. 4A is a schematic diagram of a six-piece wide-angle lens assembly according to a fourth embodiment of the disclosure, and fig. 4B is a graph of field curvature and distortion aberration of the six-piece wide-angle lens assembly according to the fourth embodiment, in order from left to right. In fig. 4A, the six-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, a sixth lens element 460, a visible light band and infrared single-wavelength band filtering element 470 and an image plane 480, wherein six lens elements have refractive power. The aperture stop 400 is disposed between an image-side surface 422 of the second lens 420 and an image-side surface 432 of the third lens 430.
The first lens element 410 with negative refractive power has an object-side surface 411 being convex at a paraxial region 490 thereof and an image-side surface 412 being concave 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 positive refractive power has an object-side surface 431 being convex at a paraxial region 490 thereof and an image-side surface 432 being convex at a paraxial region 490 thereof, and the object-side surface 431 and the image-side surface 432 are aspheric.
The fourth lens element 440 with negative refractive power has an object-side surface 441 being concave at a paraxial region 490 thereof and an image-side surface 442 being concave at a paraxial region 490 thereof, wherein the object-side surface 441 and the image-side surface 442 are aspheric.
The fifth lens element 450 with positive refractive power has an object-side surface 451 being convex at a paraxial region 490 thereof and an image-side surface 452 being convex at a paraxial region 490 thereof, and the object-side surface 451 and the image-side surface 452 are aspheric.
The sixth lens element 460 with negative refractive power has an object-side surface 461 being convex at a paraxial region 490 and an image-side surface 462 being concave at a paraxial region 490, wherein the object-side surface 461 and the image-side surface 462 are aspheric, and the object-side surface 461 and the image-side surface 462 have at least one inflection point.
The visible light band and infrared single wavelength band filtering component 470 is made of glass material, and is disposed between the sixth lens 460 and the imaging plane 480 without affecting the focal length of the six-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:
in the six-piece wide-angle lens group provided by the invention, the material of the lens can be plastic or glass, when the material of the lens is plastic, the production cost can be effectively reduced, and when the material of the lens is glass, the degree of freedom of the configuration of the refractive power of the six-piece wide-angle lens group can be increased. In addition, the object-side surface and the image-side surface of the lenses in the six-piece wide-angle lens group can be aspheric surfaces, the aspheric surfaces can be easily made into shapes other than spherical surfaces, more control variables are obtained for reducing the aberration, and the number of the lenses is further reduced, so that the total length of the six-piece wide-angle lens group can be effectively reduced.
In the six-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 a 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 six-piece wide-angle lens group provided by the invention can be applied to an optical system for moving focusing according to the requirements, has the characteristics of excellent aberration correction and good imaging quality, and can be applied to electronic image systems such as 3D (three-dimensional) image acquisition, digital cameras, mobile devices, digital drawing boards or vehicle photography and the like in many aspects.
In summary, the above embodiments and drawings are only preferred embodiments of the present invention and 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 (9)
1. A six-piece wide-angle lens set, comprising an aperture and an optical set, wherein the optical set comprises six lenses, and the six-piece wide-angle lens set sequentially comprises, from an object side to an image side:
a first 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 second lens element with positive refractive power having an object-side surface being convex at a paraxial region thereof and an image-side surface being convex at a paraxial region thereof, wherein at least one of the object-side surface and the image-side surface thereof is aspheric;
an aperture;
a third lens element with positive refractive power having an object-side surface being convex at a paraxial region thereof and an image-side surface being convex at a paraxial region thereof, wherein at least one of the object-side surface and the image-side surface is aspheric;
a fourth 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 fifth lens element with positive refractive power having an object-side surface being convex at a paraxial region and an image-side surface being convex at a paraxial region, at least one of the object-side surface and the image-side surface being aspheric;
a sixth 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, and at least one of the object-side surface and the image-side surface having at least one inflection point;
the abbe number of the third lens element is V3, the abbe number of the fourth lens element is V4, the abbe number of the fifth lens element is V5, the abbe number of the sixth lens element is V6, the overall focal length of the six-piece wide-angle lens assembly is f, the distance from the object-side surface of the first lens element to the image plane on the optical axis is TL, the focal length of the first lens element is f1, and the focal length of the second lens element is f2, where the following conditions are satisfied: 29< V3-V4< 42; 29< V5-V6< 42; 0.1< f/TL < 0.4; -0.5< f1/f2< -0.2.
2. The six-piece wide-angle lens group of claim 1, wherein the second lens element has a focal length of f2 and the third lens element has a focal length of f3, wherein the following conditions are satisfied: 4.0< f2/f3< 7.0.
3. The six-piece wide-angle lens group of claim 1, wherein the third lens element has a focal length of f3 and the fourth lens element has a focal length of f4, wherein the following conditions are satisfied: -1.05< f3/f4< -0.7.
4. The six-piece wide-angle lens group 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: -1.2< f4/f5< -0.8.
5. The six-piece wide-angle lens group of claim 1, wherein the focal length of the fifth lens element is f5, the focal length of the sixth lens element is f6, and the following conditions are satisfied: -0.7< f5/f6< -0.35.
6. The six-piece wide-angle lens group 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: -2.1< f1/f3< -1.5.
7. The six-piece wide-angle lens group 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: -6.0< f2/f4< -3.5.
8. The six-piece wide-angle lens group of claim 1, wherein the third lens element has a focal length of f3 and the fifth lens element has a focal length of f5, wherein the following conditions are satisfied: 0.65< f3/f5< 1.1.
9. The six-piece wide-angle lens group of claim 1, wherein the focal length of the fourth lens element is f4, the focal length of the sixth lens element is f6, and the following conditions are satisfied: 0.4< f4/f6< 0.75.
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| CN111123471B (en) * | 2018-10-31 | 2022-01-07 | 宁波舜宇车载光学技术有限公司 | Optical lens |
| CN111221096B (en) * | 2018-11-23 | 2023-01-06 | 南昌欧菲光电技术有限公司 | Ultra-wide-angle lens, camera module and electronic device |
| CN109541783B (en) * | 2019-01-07 | 2024-04-19 | 浙江舜宇光学有限公司 | Image pickup lens |
| WO2021128235A1 (en) * | 2019-12-27 | 2021-07-01 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
| CN111413781B (en) * | 2020-04-08 | 2021-11-19 | 惠州市星聚宇光学有限公司 | Infrared lens |
| CN113467059B (en) * | 2021-09-03 | 2022-02-11 | 江西联创电子有限公司 | Infrared confocal wide-angle lens |
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