CN113759528B - Optical lens and electronic device - Google Patents
Optical lens and electronic device Download PDFInfo
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- CN113759528B CN113759528B CN202010507281.5A CN202010507281A CN113759528B CN 113759528 B CN113759528 B CN 113759528B CN 202010507281 A CN202010507281 A CN 202010507281A CN 113759528 B CN113759528 B CN 113759528B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 134
- 238000003384 imaging method Methods 0.000 claims abstract description 18
- 239000004033 plastic Substances 0.000 description 12
- 239000011521 glass Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000005499 meniscus Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 1
- 239000004713 Cyclic olefin copolymer Substances 0.000 description 1
- 101150059062 apln gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
- G02B15/144111—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged ++-+
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
An optical lens sequentially comprises a first lens with positive diopter, a second lens with negative diopter, a third lens with positive diopter, a fourth lens with positive diopter, a fifth lens with negative diopter, a sixth lens with negative diopter, a seventh lens with negative diopter and an eighth lens with positive diopter from an object side to an image side. The optical lens provided by the invention has the characteristics of light weight, high zoom ratio, low distortion, high imaging quality and the like.
Description
Technical Field
The present invention relates to an optical lens and an electronic device, and more particularly, to a light and thin optical lens and an electronic device with high zoom magnification and good imaging quality.
Background
The optical lens can be divided into a fixed focus lens and a zoom lens, wherein the zoom lens has the advantage of variable focal length, so that the applicability of the zoom lens is wider. In order to achieve a zoom lens with high zoom magnification, low distortion and high imaging quality, a plurality of lenses are needed in most cases, so that the optical volume of the zoom lens cannot be reduced; if the number of lenses is reduced, the performance requirements of the zoom lens cannot be met. Therefore, there is an urgent need to provide a new optical lens that can meet the requirements of light weight, high zoom magnification and high imaging quality.
Disclosure of Invention
The invention aims to solve the technical problems of providing an optical lens and an electronic device, which have the characteristics of light weight, high zoom ratio, low distortion, high imaging quality and the like.
In order to achieve the above object, the present invention provides an optical lens having a total lens length of TTL, an effective focal length at a telephoto end of Ft, and an effective focal length at a wide-angle end of Fw. The optical lens sequentially comprises a first lens with positive diopter, a second lens with negative diopter, a third lens with positive diopter, a fourth lens with positive diopter, a fifth lens with negative diopter, a sixth lens with negative diopter, a seventh lens with negative diopter and an eighth lens with positive diopter from an object side to an image side.
The invention further provides an optical lens, wherein the effective focal length of the telescope end is Ft, and the effective focal length of the wide-angle end is Fw. The optical lens sequentially comprises a first lens with positive diopter, a second lens with negative diopter, a third lens with positive diopter, a fourth lens with positive diopter, a fifth lens with negative diopter, a sixth lens with negative diopter, a seventh lens with negative diopter and an eighth lens with diopter from an object side to an image side. The total lens length of the optical lens is TTL, the total lens length of the optical lens at the telephoto end is TLt, the total lens length of the optical lens at the wide-angle end is TLw, and the optical lens satisfies at least one of the following conditions: TTL is 70 mm or less and 100 mm or less, tlt=tlw and tlt=tlw=ttl.
The invention also provides an optical lens, wherein the total lens length is TTL. The optical lens sequentially comprises a first lens with positive diopter, a second lens with negative diopter, a third lens with positive diopter, a fourth lens with positive diopter, a fifth lens with negative diopter, a sixth lens with negative diopter, a seventh lens with negative diopter and an eighth lens with diopter from an object side to an image side. The effective focal length of the optical lens at the telephoto end is Ft, the effective focal length of the optical lens at the wide-angle end is Fw, and the optical lens satisfies at least one of the following conditions: ft is more than or equal to 80 mm and less than or equal to 120 mm, fw is more than or equal to 35 mm and less than or equal to 60 mm, and Ft/Fw is more than or equal to 1.3 and less than or equal to 4.
The invention further provides an electronic device which comprises an optical lens, a control module and a driving module. The optical lens continuously acquires a plurality of frame images; the control module is electrically connected with the optical lens and calculates focusing data of the optical lens according to a target object in the frame image; and the driving module is electrically connected with the control module and the optical lens and drives the optical lens to focus according to the focusing data.
The invention has the beneficial effects that: the optical lens and the electronic device have the characteristics of light weight, high zoom ratio, low distortion, high imaging quality and the like.
The invention will now be described in more detail with reference to the drawings and specific examples, which are not intended to limit the invention thereto.
Drawings
FIG. 1 is a schematic view of lens positions of an optical lens in an embodiment of the invention;
FIG. 2 is a schematic view of lens positions of the optical lens of FIG. 1 at a wide-angle end;
FIG. 3 is a diagram showing an embodiment of lens parameters of the optical lens of FIG. 1 at a telephoto end;
FIG. 4 is a diagram illustrating an embodiment of lens parameters of the optical lens system of FIG. 2 at the wide-angle end;
FIG. 5 is an aspherical mathematical formula coefficient of an aspherical lens of an embodiment of the optical lens of FIG. 1; and
Fig. 6 is a specific parameter representation of the optical lens of fig. 1.
Fig. 7 is a schematic diagram of an electronic device according to an embodiment of the invention.
Detailed Description
The structural and operational principles of the present invention are described in detail below with reference to the accompanying drawings:
embodiments of the present invention will be described in detail below with reference to the drawings as examples. In addition to these details, the present invention may be widely practiced in other embodiments, and easy alternatives, modifications, and equivalents of any of the described embodiments are included within the scope of the present disclosure and subject to the following claims. In the description of the present invention, numerous specific details are provided to provide a thorough understanding of the present invention; however, the invention may be practiced without some or all of these specific details. Furthermore, well-known steps or elements have not been described in detail in order to avoid unnecessarily limiting the present invention. The same or similar elements in the drawings will be denoted by the same or similar symbols. It is particularly noted that the drawings are for illustrative purposes only and do not represent actual dimensions or numbers of elements unless specifically stated.
Fig. 1 is a schematic view illustrating positions of lenses when an optical lens OL1 is at a telescopic (tele) end according to an embodiment of the present invention, and fig. 2 is a schematic view illustrating positions of lenses when the optical lens OL1 is at a wide (wide) end according to fig. 1. Only the structures related to the embodiments of the present invention are shown and the remaining structures are omitted in order to reveal the features of the embodiments.
The optical lens OL1 may be a zoom lens, which may be applied to a device having an image projection or image acquisition function, including but not limited to a handheld computer system, a handheld communication system, an aerial camera, a sports camera lens, a vehicular camera lens, a monitoring system, a webcam, a digital camera, a digital video camera or a projector.
Referring to fig. 1 and 2, the left side is an object side (object side), the right side is an image-forming side (image-forming side), and the light beam can penetrate through each lens in the optical lens OL1 from the object side and be imaged on an imaging plane IMA of the image side. The optical lens OL1 sequentially includes, from an object side to an image side, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, a seventh lens element L7 and an eighth lens element L8, which are arranged along an optical axis OA. The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 may have diopters, respectively.
In one embodiment, the first lens L1 may have positive refractive power; the second lens L2 may have a negative diopter; the third lens L3 may have a positive refractive power; the fourth lens L4 may have positive refractive power; the fifth lens L5 may have negative diopter; the sixth lens L6 may have negative diopter; the seventh lens L7 may have negative diopter; the eighth lens L8 may have diopter. In one embodiment, the eighth lens L8 has positive refractive power.
In one embodiment, the total lens length is defined as a distance between the object-side surface S1 of the first lens element L1 and the image plane IMA. The total lens length of the optical lens OL1 is TTL, the total lens length of the optical lens OL1 at the telephoto end is TLt, the total lens length of the optical lens at the wide-angle end is TLw, and the optical lens OL1 may satisfy the condition of tlt=tlw.
In one embodiment, the optical lens OL1 may satisfy the condition of ttl=tlt=tlw, that is, the total lens length of the optical lens OL1 remains constant during zooming of the optical lens OL1.
In one embodiment, the optical lens OL1 may satisfy at least one of the following conditions: 70 mm TTL, 75 mm TTL, 80 mm TTL, 90 mm TTL, 95 mm TTL and 100 mm TTL.
In one embodiment, the effective focal length (Effective Focal Length) of the optical lens OL1 at the telephoto end is Ft, the effective focal length of the optical lens OL1 at the wide-angle end is Fw, and the optical lens OL1 may satisfy at least one of the following conditions: ft/Fw is less than or equal to 1.3, ft/Fw is less than or equal to 1.5, ft/Fw is less than or equal to 1.7, ft/Fw is less than or equal to 2.3, ft/Fw is less than or equal to 3, ft/Fw is less than or equal to 3.5 and Ft/Fw is less than or equal to 4.
In one embodiment, the effective focal length of the telephoto end of the optical lens OL1 may satisfy at least one of the following conditions: ft is less than or equal to 80 mm, ft is less than or equal to 85 mm, ft is less than or equal to 90 mm, ft is less than or equal to 95 mm, ft is less than or equal to 100 mm, ft is less than or equal to 110 mm, and Ft is less than or equal to 120 mm.
In one embodiment, the effective focal length of the wide-angle end of the optical lens OL1 may satisfy at least one of the following conditions: fw is less than or equal to 35 mm, fw is less than or equal to 40 mm, fw is less than or equal to 45 mm, fw is less than or equal to 50 mm, fw is less than or equal to 55 mm, and Fw is less than or equal to 60 mm.
In one embodiment, the telescopic end of the optical lens OL1 may satisfy at least one of the following conditions: TTL/Ft is more than or equal to 0.8 and less than or equal to 0.85, TTL/Ft is more than or equal to 0.9 and less than or equal to 0.95, TTL/Ft is more than or equal to 1, TTL/Ft is more than or equal to 1.1 and TTL/Ft is more than or equal to 1.2.
In one embodiment, the wide-angle end of the optical lens OL1 may satisfy at least one of the following conditions: 1.3.ltoreq.TTL/Fw, 1.4.ltoreq.TTL/Fw, 1.5.ltoreq.TTL/Fw, 1.6.ltoreq.TTL/Fw, 1.68.ltoreq.TTL/Fw, 1.75.ltoreq.TTL/Fw, 1.8.ltoreq.TTL/Fw, 1.85.ltoreq.TTL/Fw, 1.9.ltoreq.TTL/Fw.ltoreq.2, 2.ltoreq.TTL/Fw and 2.5.ltoreq.TTL/Fw.
In one embodiment, the incident light beam incident on the optical lens OL1 may be converged on the imaging plane IMA. If the imaging height on the imaging plane IMA is Y, the telephoto end of the optical lens OL1 may satisfy at least one of the following conditions: ft/Y is more than 20 and less than or equal to 21 and less than or equal to Ft/Y, ft/Y, ft/Y is more than or equal to 23 and less than or equal to 25, ft/Y is more than or equal to 27 and Ft/Y is less than 30.
In one embodiment, the wide-angle end of the optical lens OL1 may satisfy at least one of the following conditions: fw/Y is more than 8 and less than or equal to 10, fw/Y, fw/Y is more than or equal to 13, fw/Y is more than or equal to 18, and Fw/Y is more than or equal to 20.
Furthermore, in an embodiment, the first lens L1 has a refractive index N1 and an abbe number V1, the second lens L2 has a refractive index N2 and an abbe number V2, the third lens L3 has a refractive index N3 and an abbe number V3, the fourth lens L4 has a refractive index N4 and an abbe number V4, the fifth lens L5 has a refractive index N5 and an abbe number V5, the sixth lens L6 has a refractive index N6 and an abbe number V6, the seventh lens L7 has a refractive index N7 and an abbe number V7, the eighth lens L8 has a refractive index N8 and an abbe number V8, and the optical lens OL1 can satisfy at least one of the following conditions: n2 > N5, N4 > N5, N5 > N1, N1 > N7, N7 > N8, N8 > N3, N8 > N6, V3 > V8, V6 > V8, V8 > V1, V1 > V5, V1 > V7, V7 > V2, and V7 > V4.
In an embodiment, the radius of curvature of the object-side surface S1 of the first lens L1 is R1, the radius of curvature of the image-side surface S2 of the first lens L1 is R2, and the optical lens OL1 may satisfy at least one of the following conditions: 0.ltoreq.l (R1-R2)/(R1+R2) | 0.1.ltoreq.l (R1-R2)/(R1+R2) | 0.25, | (R1-R2)/(R1+R2) | ltoreq.0.3, | (R1-R2)/(R1+R2) | ltoreq.0.5, | (R1-R2)/(R1+R2) | 1.
In one embodiment, the optical lens OL1 may satisfy at least one of the following conditions: -1 < R1-R2)/(R1+R2), -0.5 < R1-R2)/(R1+R2), -0.3 < R1-R2)/(R1+R2), -0.25 < R1-R2)/(R1+R2), (R1-R2)/(R1+R2) < 0.1 and (R1-R2)/(R1+R2) < 0.
In one embodiment, the radius of curvature of the object-side surface S15 of the eighth lens L8 is R15, the radius of curvature of the image-side surface S16 of the eighth lens L8 is R16, and the optical lens OL1 may satisfy at least one of the following conditions: 0.ltoreq.l (R15+R16)/(R15-R16) | 0.05.ltoreq.l (R15+R16)/(R15-R16) | 0.15, | (R15+R16)/(R15-R16) | ltoreq.0.3, | (R15+R16)/(R15-R16) | ltoreq.0.5, | (R15+R16)/(R15-R16) | ltoreq.1.
In one embodiment, the optical lens OL1 may satisfy at least one of the following conditions: (R15+R16)/(R15-R16), and 0.05.ltoreq.R15+R16)/(R15-R16), (R15+R16)/(R15-R16).ltoreq.0.15, (R15+R16)/(R15-R16).ltoreq.0.3, (R15+R16)/(R15-R16).ltoreq.0.5, and (R15+R16)/(R15-R16).ltoreq.1.
In an embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 can be spherical or aspherical lenses, respectively.
Specifically, each aspheric lens has at least one aspheric surface, that is, the object-side surface and/or the image-side surface of the aspheric lens are aspheric surfaces. And each aspheric surface can satisfy the following mathematical formula:
wherein Z is a coordinate value in the direction of the optical axis OA, A2, A4, A6, A8, and a10 are aspherical coefficients with the light transmission direction being a positive direction, K is a quadric constant, c=1/R, R is a radius of curvature, Y is a coordinate value in the direction orthogonal to the optical axis OA, and a direction away from the optical axis OA is a positive direction. In addition, the values of the parameters or coefficients of each aspheric surface formula can be set to determine the focal length of each location point of the aspheric surface.
In one embodiment, at least one of the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 is a spherical lens; in another embodiment, at least one of the first lens L1, the sixth lens L6, the seventh lens L7 and the eighth lens L8 is an aspherical lens.
In addition, in an embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 may be glass lenses made of glass materials or plastic lenses made of plastic materials, respectively. In one embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are all glass lenses, but the invention is not limited thereto; in another embodiment, at least one of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 is a plastic lens.
Further, the plastic material may include, but is not limited to, polycarbonate (polycarbonate), cyclic olefin copolymer (e.g., APEL), and polyester resin (e.g., OKP or OKP HT), etc., or may be a mixed and/or compounded material comprising at least one of the foregoing.
Referring to fig. 1 and 2, the object-side surface S1 of the first lens L1 may be a convex surface protruding toward the object side, which has a positive refractive index; the image side surface S2 of the first lens L1 may be a concave surface concave toward the object side, which has a positive refractive index. In one embodiment, the first lens L1 may be a lens with positive refractive power, including but not limited to a convex-concave lens with positive refractive power, a glass lens or a plastic lens, and any one or combination of a spherical lens and an aspherical lens.
The object-side surface S3 of the second lens L2 may be a convex surface approaching the plane and slightly protruding toward the object side at the optical axis OA, which has a positive refractive index; the image side surface S4 of the second lens L2 may be a concave surface concave toward the object side, which has a positive refractive index. In one embodiment, the second lens L2 may be a lens with negative refractive power, including but not limited to any one or combination of a convex-concave lens, a glass lens or a plastic lens with negative refractive power, and a spherical lens or an aspherical lens.
The object-side surface S5 of the third lens L3 may be a convex surface protruding toward the object side, which has a positive refractive index; the image side surface S6 of the third lens L3 may be a convex surface protruding toward the image side, which has a negative refractive index. In one embodiment, the third lens L3 may be a lens with positive refractive power, including but not limited to a biconvex lens, a glass lens or a plastic lens with positive refractive power, and any one or combination of a spherical lens and an aspherical lens.
The object-side surface S7 of the fourth lens L4 may be a convex surface protruding toward the object side, which has a positive refractive index; the image side surface S8 may be a convex surface protruding toward the image side, which has a negative refractive index. In one embodiment, the fourth lens L4 may be a lens with positive refractive power, including but not limited to a biconvex lens, a glass lens or a plastic lens with positive refractive power, and any one or combination of a spherical lens and an aspherical lens.
The object-side surface S9 of the fifth lens L5 may be a concave surface concave toward the image side, which has a negative refractive index; the image side surface S10 of the fifth lens L5 may be a concave surface concave toward the object side, which has a positive refractive index. In one embodiment, the fifth lens L5 may be a lens with negative refractive power, including but not limited to any one or combination of a biconcave lens, a glass lens, or a plastic lens with negative refractive power, and a spherical lens or an aspherical lens.
The object-side surface S11 of the sixth lens L6 may be a concave surface concave toward the image side, which has a negative refractive index; the image side surface S12 of the sixth lens L6 may be a convex surface protruding toward the image side, which has a negative refractive index. In one embodiment, the sixth lens L6 may be a lens with negative refractive power, including but not limited to a meniscus lens, a glass lens or a plastic lens with negative refractive power, and any one or combination of a spherical lens and an aspherical lens.
The object-side surface S13 of the seventh lens L7 may be a concave surface concave toward the image side, which has a negative refractive index; the image side surface S14 of the seventh lens L7 may be a convex surface protruding toward the image side, which has a negative refractive index. In one embodiment, the seventh lens L7 may be a lens with negative refractive power, including but not limited to a meniscus lens, a glass lens or a plastic lens with negative refractive power, and any one or combination of a spherical lens and an aspherical lens.
The object-side surface S15 of the eighth lens L8 may be a convex surface protruding toward the object side, which has a positive refractive index; the image side surface S16 may be a convex surface protruding toward the image side, which has a negative refractive index. In one embodiment, the eighth lens L8 may be a lens with positive refractive power, including but not limited to a biconvex lens, a glass lens or a plastic lens with positive refractive power, and any one or combination of a spherical lens and an aspherical lens.
In one embodiment, the optical lens OL1 may further include an aperture stop; in another embodiment, an image acquisition unit (not shown) may be further disposed on the imaging plane IMA, which may perform photoelectric conversion on the light beam penetrating the optical lens OL1. The aperture stop may be disposed on the object side of the first lens element L1, in any of the gaps between any two lens elements of the first lens element L1 to the eighth lens element L8, or between the eighth lens element L8 and the image plane IMA. In one embodiment, the aperture stop is disposed between the first lens L1 and the second lens L2.
Furthermore, the optical lens OL1 may further include an optical filter F and/or a protection sheet C. In one embodiment, the filter F may be disposed between the eighth lens L8 and the imaging plane IMA. In one embodiment, the Filter F may be an infrared Filter (IR Filter); in another embodiment, the protection sheet C may be disposed between the optical filter F and the imaging plane IMA, and a filter film (not shown) may be further formed on the protection sheet C; in still another embodiment, only the protective sheet C integrating the functions of protecting the image acquisition unit and filtering the infrared light beam may be used.
Fig. 3 is an embodiment of lens parameters of the optical lens OL1 in fig. 1 at the telephoto end, and fig. 4 is an embodiment of lens parameters of the optical lens OL1 in fig. 2 at the wide-angle end. Fig. 3 and 4 include the radius of curvature, thickness, refractive index, abbe number (abbe number), effective diameter, effective focal length, and the like of each lens, respectively. Wherein the surface codes of the lenses are sequentially arranged from the object side to the image side, for example: "STO" represents the aperture STO, "S1" represents the object side surface S1 of the first lens L1, "S2" represents the image side surface S2 of the first lens L1, respectively, "S17" and "S18" represent the object side surface S17 and the image side surface S18 of the filter F, respectively, "S19" and "S20" represent the object side surface S19 and the image side surface S20 of the protection sheet C, respectively, and so on. In addition, the "thickness" represents the distance between the surface and the next surface adjacent to the image side direction, for example, the "thickness" of the object side surface S1 is the distance between the object side surface S1 of the first lens L1 and the image side surface S2 of the first lens L1; the "thickness" of the image side surface S2 is the distance between the image side surface S2 of the first lens element L1 and the object side surface S3 of the second lens element L2.
Referring to fig. 1 to 4, the first lens group L1 and the sixth lens L6 are at the same position at the wide-angle end and the telephoto end, but during zooming of the optical lens OL1, the first lens group L1 and the sixth lens L6 can move or fix on the optical axis OA respectively.
Fig. 5 is an aspherical mathematical formula coefficient of an aspherical lens of an embodiment of the optical lens OL1 of fig. 1. If the object side surfaces S1, S13, S15 and the image side surfaces S12, S14, S16 of the first lens L1, the sixth lens L6, the seventh lens L7 and the eighth lens L8 of the optical lens OL1 are aspheric surfaces, the coefficients of the aspheric mathematical formulas can be as shown in fig. 5.
Further, referring to fig. 1 and 2, in an embodiment, the optical lens OL1 may be defined as a first lens group G1, a second lens group G2, a third lens group G3 and a fourth lens group G4. The first lens group G1 may include a first lens L1; the second lens group G2 may include a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5; the third lens group G3 may include a sixth lens L6; the fourth lens group G4 may include a seventh lens L7 and an eighth lens L8. In one embodiment, the first lens group G1 may have positive refractive power, the second lens group G2 may have positive refractive power, the third lens group G3 may have negative refractive power, and the fourth lens group G4 may have positive refractive power; in another embodiment, the first lens group G1, the second lens group G2, the third lens group G3 and the fourth lens group G4 of the optical lens OL1 can be displaced along the optical axis OA between the telephoto end and the wide-angle end during zooming; in another embodiment, the aperture stop STO can move along the optical axis OA along with the movement of the second lens group G2, but not limited thereto; in another embodiment, during zooming, the aperture stop STO can move along the optical axis OA along with the movement of the second lens group G2, but not limited thereto.
Fig. 6 is a parametric representation of an embodiment of the optical lens OL1 of fig. 1, which includes an effective focal length Fw of the optical lens OL1 at the wide-angle end, an effective focal length Ft at the telephoto end, and an effective focal length F of the first lens group G1 G1 Effective focal length F of the second lens group G2 G2 Effective focal length F of third lens group G3 G3 Effective focal length F of fourth lens group G4 G4 The distance TTL between the object side surface S1 of the first lens L1 and the imaging plane IMA, the aperture value FNo, the viewing angle FOVt of the optical lens OL1 at the telephoto end, the viewing angle FOvw at the wide-angle end, the imaging height Y, the curvature radii R1, R15, R2 and R16 of the object side surfaces S1, S15 and the image side surfaces S2, S16 at the optical axis OA, and the values of the relation between the parameters.
Furthermore, in one embodiment, the optical lens OL1 may satisfy at least one of the following conditions: f is more than or equal to 0.5 G1 /F G2 、0.7≤F G1 /F G2 、0.75≤F G1 /F G2 、F G1 /F G2 ≤0.8、F G1 /F G2 Less than or equal to 0.85 and F G1 /F G2 ≤1。
Fig. 7 is a schematic diagram of an electronic device 100 according to an embodiment of the invention. Referring to fig. 1, 2 and 7, the electronic device 100 includes an optical lens OL1, a control module 30 and a driving module 50, wherein the control module 30 is electrically connected to the optical lens OL1, and the driving module 50 is electrically connected to the control module 30 and the optical lens OL1.
The optical lens OL1 may continuously acquire a plurality of frame images and transmit the images to the control module 30. At least two of the plurality of frame images include a target object, wherein the target object may be a person, a face, an animal, an object pre-designated by a user, or a target automatically selected by the control module 30, but the invention is not limited thereto; the control module 30 calculates focusing data of the optical lens according to the object in the frame image, wherein the focusing data may include positions of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 on the optical axis OA; thereafter, the driving module 50 drives the optical lens OL1 to focus according to the focusing data, so that the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 move to the focusing position according to the focusing data. In one embodiment, the optical lens OL1 continuously acquires an image, the control module 30 continuously updates the focusing data according to the latest image, and the driving module 50 continuously drives the optical lens OL1 to the focusing position with the updated focusing data.
In one embodiment, the electronic device 100 is an aerial camera, the optical lens OL1 has a viewing angle of FOVt at the telephoto end and a viewing angle of FOVw at the wide-angle end, and the optical lens OL1 may satisfy at least one of the following conditions: FOVt is less than or equal to 5 degrees, FOVt is less than or equal to 8 degrees, FOVw is less than or equal to 10 degrees, FOVw is less than or equal to 12 degrees, and FOVw is less than or equal to 15 degrees.
As can be seen from the above embodiments, the optical lens provided by the present invention has the characteristics of light weight, high zoom ratio, low distortion, high imaging quality, and the like.
Of course, the present invention is capable of other various embodiments and its several details are capable of modification and variation in light of the present invention, as will be apparent to those skilled in the art, without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. An optical lens having total lens length TTL, imaging height Y, effective focal length Ft at a telephoto end and effective focal length Fw at a wide-angle end, wherein the optical lens comprises eight lenses and sequentially from an object side to an image side:
a first lens having positive diopter;
a second lens having negative diopter;
a third lens having positive diopter;
a fourth lens having positive diopter;
a fifth lens having negative diopter;
a sixth lens having negative diopter;
a seventh lens having negative diopter; and
an eighth lens having positive diopter, wherein the optical lens satisfies at least one of the following conditions: 20< Ft/Y <30, 8< Fw/Y <20, 0.8.ltoreq.TTL/Ft.ltoreq.1.2, 1.3.ltoreq.TTL/Fw.ltoreq.2.5.
2. An optical lens having an effective focal length Ft at a telephoto end and an effective focal length Fw at a wide-angle end, wherein the optical lens comprises eight lenses, and the order from an object side to an image side is:
a first lens having positive diopter;
a second lens having negative diopter;
a third lens having positive diopter;
a fourth lens having positive diopter;
a fifth lens having negative diopter;
a sixth lens having negative diopter;
a seventh lens having negative diopter; and
an eighth lens having positive diopter, wherein the total lens length of the optical lens is TTL, the total lens length of the optical lens at the telephoto end is TLt, the total lens length of the optical lens at the wide-angle end is TLw, and the optical lens satisfies at least one of the following conditions: tlt=tlw and tlt=tlw=ttl.
3. The total lens length of the optical lens is TTL, and the optical lens is characterized by comprising eight lenses from an object side to an image side in sequence:
a first lens having positive diopter;
a second lens having negative diopter;
a third lens having positive diopter;
a fourth lens having positive diopter;
a fifth lens having negative diopter;
a sixth lens having negative diopter;
a seventh lens having negative diopter; and
an eighth lens having positive diopter, wherein the effective focal length of the optical lens at the telephoto end is Ft, the effective focal length of the optical lens at the wide-angle end is Fw, and the optical lens satisfies Ft/Fw being 1.3.ltoreq.Ft/Fw.ltoreq.4.
4. An optical lens as claimed in any one of claims 2 to 3, wherein an imaging height of the optical lens is Y, and the optical lens satisfies at least one of the following conditions: 20< Ft/Y <30, 8< Fw/Y <20, 0.8.ltoreq.TTL/Ft.ltoreq.1.2, 1.3.ltoreq.TTL/Fw.ltoreq.2.5.
5. The optical lens of any one of claims 1 to 3, wherein the first lens has a refractive index N1, an abbe number V1, the second lens has a refractive index N2, an abbe number V2, the third lens has a refractive index N3, an abbe number V3, the fourth lens has a refractive index N4, an abbe number V4, the fifth lens has a refractive index N5, an abbe number V5, the sixth lens has a refractive index N6, an abbe number V6, the seventh lens has a refractive index N7, an abbe number V7, the eighth lens has a refractive index N8, an abbe number V8, and the optical lens satisfies at least one of the following conditions: n2 > N5, N4 > N5, N5 > N1, N1 > N7, N7 > N8, N8 > N3, N8 > N6, V3 > V8, V6 > V8, V8 > V1, V1 > V5, V1 > V7, V7 > V2, and V7 > V4.
6. The optical lens as claimed in any one of claims 1 to 3, wherein a radius of curvature of the object-side surface of the first lens element is R1, 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 eighth lens element is R15 and a radius of curvature of the image-side surface of the eighth lens element is R16, and the optical lens assembly meets at least one of: (R1-R2)/(R1+R2) 1, -1 (R1-R2)/(R1+R2) 0 (R15+R16)/(R15-R16) 1 (R1-R2).
7. An optical lens as claimed in any one of claims 1 to 3, wherein the optical lens satisfies at least one of the following conditions: the second lens, the third lens, the fourth lens and the fifth lens are all positive diopters, and the seventh lens and the eighth lens are all positive diopters.
8. The optical lens as claimed in any one of claims 1 to 3, wherein the first lens is defined as a first lens group, the second lens, the third lens, the fourth lens and the fifth lens are defined as a second lens group, and an effective focal length of the first lens group is F G1 The effective focal length of the second lens group is F G2 The optical lens satisfies F being more than or equal to 0.5 G1 /F G2 ≤1。
9. An optical lens as claimed in any one of claims 1 to 3, wherein the optical lens satisfies at least one of the following conditions: the first lens is a convex-concave lens, the second lens is a convex-concave lens, the third lens is a biconvex lens, the fourth lens is a biconvex lens, the fifth lens is a biconcave lens, the sixth lens is a concave-convex lens, the seventh lens is a concave-convex lens, and the eighth lens is a biconvex lens.
10. An electronic device, comprising:
the optical lens according to any one of claims 1 to 3, wherein a plurality of frame images are acquired continuously;
the control module is electrically connected with the optical lens and used for calculating focusing data of the optical lens according to a target object in the frame images; and
the driving module is electrically connected with the control module and the optical lens and drives the optical lens to focus according to the focusing data.
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| CN202010507281.5A CN113759528B (en) | 2020-06-05 | 2020-06-05 | Optical lens and electronic device |
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| CN113759528B true CN113759528B (en) | 2023-11-21 |
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| JP4914999B2 (en) * | 2007-04-11 | 2012-04-11 | ペンタックスリコーイメージング株式会社 | Telephoto lens system |
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