CN114690388B - Zoom lens - Google Patents
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- CN114690388B CN114690388B CN202210612509.6A CN202210612509A CN114690388B CN 114690388 B CN114690388 B CN 114690388B CN 202210612509 A CN202210612509 A CN 202210612509A CN 114690388 B CN114690388 B CN 114690388B
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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
- G02B15/143—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 three groups only
- G02B15/1431—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 three groups only the first group being positive
- G02B15/143103—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 three groups only the first group being positive arranged ++-
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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
- G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
Abstract
The invention discloses a zoom lens, which sequentially comprises the following components from an object side to an imaging surface along an optical axis: a diaphragm; a first group having positive optical power, a second group having positive optical power, a third group having negative optical power; the first group includes in order from the object side to the imaging surface along the optical axis: a first lens having a positive power, a second lens having a negative power, a third lens having a negative power; the second group sequentially comprises from the object side to the image plane along the optical axis: a fourth lens having a focal power, a fifth lens having a positive focal power, a sixth lens having a positive focal power; the third group includes, in order from the object side to the image plane along the optical axis: a seventh lens having a positive power, an eighth lens having a negative power, and a filter. The zoom lens can realize continuous zooming, and simultaneously ensures the effects of large imaging target surface, high pixel and high imaging quality.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to a zoom lens.
Background
With the continuous upgrading and upgrading of intelligent terminal products, the development of the lens of portable electronic products such as mobile phones and the like is also rapidly advanced. Nowadays, in order to achieve a zoom photographing effect, a solution generally adopted by portable electronic products such as mobile phones is "baton" zoom, that is, a zoom effect is simulated by switching three lenses, namely, a wide-angle lens, a standard lens and a telephoto lens.
However, the drawbacks of this multi-lens scheme are very significant. Firstly, when a plurality of lenses simulate the zooming effect, the lenses need to be switched, so that zooming is discontinuous, and meanwhile, the white balance is unstable due to lens switching, so that the visual effect is poor and satisfactory in use. Secondly, the focal length is still the principle of digital cutting zooming utilized in the process of switching from the wide-angle state to the standard state or from the standard state to the tele state, so that the performance and the pixel have great loss, and the zooming experience effect of portable electronic products such as mobile phones and the like is greatly reduced.
Disclosure of Invention
Therefore, an object of the present invention is to provide a zoom lens, which can achieve 2.3 times of optical continuous zooming from a telephoto end to a wide-angle end of the lens by changing a spacing distance between different groups, and pixels are maintained at the same level during zooming, so that pixel loss is effectively reduced, a large imaging target surface, high pixels, and high imaging quality are ensured, and the use requirements of portable electronic products such as mobile phones can be better met.
The embodiment of the invention implements the above object by the following technical scheme.
The invention provides a zoom lens, which sequentially comprises the following components from an object side to an imaging surface along an optical axis: a diaphragm; a first group having positive optical power, a second group having positive optical power, a third group having negative optical power; the first group sequentially includes from an object side to an imaging surface along an optical axis: a first lens having a positive power, a second lens having a negative power, a third lens having a negative power; the second group comprises, in order from the object side to the image plane along the optical axis: a fourth lens having a focal power, a fifth lens having a positive focal power, a sixth lens having a positive focal power; the third group comprises, in order from the object side to the image plane along the optical axis: a seventh lens with positive focal power, an eighth lens with negative focal power and an optical filter; wherein, the lenses are not adhered to each other; the air space between each adjacent group among the first group, the second group and the third group and the imaging surface on the optical axis is variable; the zoom lens satisfies the following conditional expression: 0.2<(T1 W +T2 W +T3 W )/(T1 T +T2 T +T3 T )<0.6; wherein, T1 W Represents a separation distance, T2, on the optical axis of the first group and the second group at the wide-angle end W Represents a separation distance on the optical axis of the second group and the third group at the wide-angle end, T3 W Represents a separation distance, T1, of the third group and the imaging plane on the optical axis at the wide-angle end T Represents a separation distance, T2, on the optical axis of the first group and the second group at the telephoto end T Represents a separation distance on the optical axis of the second and third clusters at the telephoto end, T3 T Indicating the separation distance of the third group and the imaging plane on the optical axis at the telephoto end.
In the prior art, a relay baton type zoom is usually adopted, namely, a zoom effect is simulated by switching three lenses, namely a wide-angle lens, a standard lens and a telephoto lens, so that the zoom is discontinuous, and the pixel loss is low and the quality is low. Compared with the prior art, the zoom lens provided by the invention can realize continuous lossless zooming of the lens by changing the air intervals among the adjacent groups and between the third group and the imaging surface, simultaneously ensures large imaging target surface, high pixel and high imaging quality effect, and can better meet the use requirements of portable electronic products such as mobile phones and the like.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic configuration diagram of a zoom lens according to a first embodiment of the present invention at a wide-angle end;
FIG. 2 is a schematic structural diagram of a zoom lens system at a telephoto end according to a first embodiment of the present invention;
fig. 3 is a f-tan θ distortion graph of the zoom lens at the wide-angle end according to the first embodiment of the present invention;
FIG. 4 is a paraxial curvature of field plot of the zoom lens of the first embodiment of the present invention at the wide-angle end;
FIG. 5 is a graph of axial chromatic aberration at the wide-angle end of the zoom lens according to the first embodiment of the present invention;
FIG. 6 is a graph showing the f-tan θ distortion of the zoom lens of the first embodiment of the present invention at the telephoto end;
FIG. 7 is a paraxial curvature of field graph of the zoom lens of the first embodiment of the present invention at the telephoto end;
FIG. 8 is a graph showing axial chromatic aberration at the telephoto end of the zoom lens according to the first embodiment of the present invention;
fig. 9 is a schematic structural view of a zoom lens according to a second embodiment of the present invention at a wide-angle end;
FIG. 10 is a schematic structural diagram of a zoom lens according to a second embodiment of the present invention at the telephoto end;
fig. 11 is a f-tan θ distortion curve diagram of a zoom lens at the wide-angle end according to a second embodiment of the present invention;
FIG. 12 is a paraxial curvature of field curve graph at the wide-angle end of the zoom lens according to the second embodiment of the present invention;
FIG. 13 is a graph of axial chromatic aberration at the wide-angle end of a zoom lens according to the second embodiment of the present invention;
FIG. 14 is a graph showing the f-tan θ distortion of the zoom lens of the second embodiment of the present invention at the telephoto end;
FIG. 15 is a paraxial curvature of field graph of the zoom lens of the second embodiment of the present invention at the telephoto end;
FIG. 16 is a graph showing an axial chromatic aberration at a telephoto end in the zoom lens according to the second embodiment of the present invention;
fig. 17 is a schematic configuration view of a zoom lens according to a third embodiment of the present invention at the wide-angle end;
FIG. 18 is a schematic structural view of a zoom lens according to a third embodiment of the present invention at the telephoto end;
fig. 19 is a f-tan θ distortion curve diagram of a zoom lens according to a third embodiment of the present invention at the wide-angle end;
FIG. 20 is a paraxial curvature of field curve graph at the wide-angle end of the zoom lens according to the third embodiment of the present invention;
FIG. 21 is a graph of axial chromatic aberration at the wide-angle end of a zoom lens according to the third embodiment of the present invention;
FIG. 22 is a graph showing the f-tan θ distortion of the zoom lens of the third embodiment of the present invention at the telephoto end;
FIG. 23 is a paraxial curvature of field plot of the zoom lens of the third embodiment of the present invention at the telephoto end;
FIG. 24 is a graph showing axial chromatic aberration at the telephoto end of the zoom lens according to the third embodiment of the present invention;
FIG. 25 is a diagram showing a vertical distance Y from an inflection point on an image-side surface of the eighth lens element to an optical axis R82 Schematic representation of (a).
Detailed Description
In order to make the objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures are described in detail below. Several embodiments of the invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Like reference numerals refer to like elements throughout the specification.
The invention provides a zoom lens, which sequentially comprises the following components from an object side to an imaging surface along an optical axis: a diaphragm; a first group having positive optical power, a second group having positive optical power, a third group having negative optical power;
the first group sequentially includes from an object side to an imaging surface along an optical axis: a first lens having a positive power, a second lens having a negative power, a third lens having a negative power;
the second group comprises, in order from the object side to the image plane along the optical axis: a fourth lens having a focal power, a fifth lens having a positive focal power, a sixth lens having a positive focal power;
the third group comprises, in order from the object side to the image plane along the optical axis: a seventh lens with positive focal power, an eighth lens with negative focal power and an optical filter;
wherein, the lenses are not adhered to each other;
the air space between each adjacent group among the first group, the second group and the third group and the imaging surface on the optical axis is variable;
the zoom lens satisfies the following conditional expression:
0.2<(T1 W +T2 W +T3 W )/(T1 T +T2 T +T3 T )<0.6；（1）
wherein, T1 W Represents a separation distance, T2, of the first group and the second group on the optical axis at the wide-angle end W Represents a separation distance on the optical axis of the second group and the third group at the wide-angle end, T3 W Represents a separation distance, T1, of the third group and the imaging plane on the optical axis at the wide-angle end T Represents a separation distance, T2, on the optical axis of the first and second clusters at the telephoto end T Represents a separation distance on the optical axis of the second and third clusters at the telephoto end, T3 T And a separation distance between the third group and the imaging surface on the optical axis at the telephoto end.
The optical zoom lens meets the condition formula (1), and the spacing distances of the adjacent groups on the optical axis between the first group, the second group, the third group and the imaging surface in the wide-angle state and the telephoto state are reasonably distributed, so that the optical zoom lens has good imaging quality in the continuous zooming process, has excellent zooming capability, and is beneficial to reducing the moving amount of the zoom lens in the zooming process and reducing the design difficulty of driving a zoom motor.
The zoom lens of the present invention can achieve continuous lossless zooming of the lens between the wide-angle end and the telephoto end by changing the distance of separation of the first group and the second group on the optical axis, the distance of separation of the second group and the third group on the optical axis, and the distance of separation of the third group from the imaging surface on the optical axis.
Specifically, in the embodiment of the present invention, the object-side surface of the first lens is a convex surface; the image side surface of the second lens is a concave surface; the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; the object side surface of the fourth lens element is concave, and the image side surface of the fourth lens element is convex at a paraxial region; the object-side surface of the fifth lens element is convex at a paraxial region thereof, and the image-side surface of the fifth lens element is convex; the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface; the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface; an object-side surface of the eighth lens element is concave at a paraxial region thereof, and an image-side surface of the eighth lens element is concave at a paraxial region thereof;
wherein the zoom lens comprises at least one aspheric lens.
In some embodiments, the fourth lens has a negative power, the image-side surface of the first lens is concave, and the object-side surface of the second lens is convex. In other embodiments, the fourth lens element has a positive optical power, the image-side surface of the first lens element is convex, and the object-side surface of the second lens element is concave.
In some embodiments, the zoom lens satisfies the following conditional expression:
1.3<f T /f W <2.3；（2）
wherein f is T Representing the effective focal length of the zoom lens at the telephoto end, f W An effective focal length of the zoom lens at the wide-angle end is indicated.
The zoom lens can have a wide zooming range by meeting the conditional expression (2), can realize 2.3 times of optical continuous zooming from a telephoto end to a wide-angle end, ensures that the image quality can be zoomed without damage in the process from a wide-angle state to a telephoto state, and improves the shooting experience of a user to a certain extent.
In some embodiments, the zoom lens satisfies the following conditional expression:
1.1<TL T /TL W <1.8；（3）
wherein, TL T Represents the distance, TL, on the optical axis from the object side surface of the first lens to the imaging surface at the telephoto end W And a distance on an optical axis from an object side surface of the first lens to the image plane at a wide angle end.
The conditional expression (3) is satisfied, and in the switching process of the wide-angle end and the telephoto end, the total length variation ratio in two states is controlled, so that the total length of the whole lens can be reduced, the size of the module is reduced, and the installation space is saved.
In some embodiments, the zoom lens satisfies the following conditional expression:
2<f Q1 /f W <50；（4）
wherein, f Q1 Representing the combined focal length of the first group, f W An effective focal length of the zoom lens at the wide-angle end is indicated. When f is Q1 /f W When the value of (A) exceeds the upper limit, the deflection capability of the first group is too weak, and the zoom lens is suitable for correcting various aberrations, but the total length of the zoom system is too long, the aperture of the lens is too large, and the miniaturization of the lens is difficult to realize; when f is Q1 /f W When the value of (a) exceeds the lower limit, the deflection capability of the first group is too strong, at this time, the total length can be reduced, but the field curvature cannot be well balanced, and at the same time, barrel distortion is easy to appear at the wide-angle end, which affects the imaging quality.
In some embodiments, the zoom lens satisfies the following conditional expression:
0.2<f Q2 /f T <0.65；（5）
wherein, f Q2 Representing the combined focal length of the second group, f T And the effective focal length of the zoom lens at the long focal end is represented.
Satisfy above-mentioned conditional expression (5), the focus of rational distribution second group is favorable to better correcting the spherical aberration under the long focal end state, shortens the overall length of long focal state simultaneously, can better maintain the miniaturization of system.
In some embodiments, the zoom lens satisfies the following conditional expression:
-0.5<f Q3 /(f W +f T )<-0.2；（6）
wherein f is Q3 Represents a combined focal length of the third group, f T Representing the effective focal length of the zoom lens at the telephoto end, f W An effective focal length of the zoom lens at the wide-angle end is indicated.
The condition formula (6) is satisfied, and the focal length of the third group is reasonably distributed, so that the aberration of the system in the zooming process is balanced, and the system has a good imaging effect in the zooming process.
In some embodiments, the zoom lens satisfies the following conditional expression:
0.8<IH W /IH T <1.4；（7）
wherein IH W IH representing the actual half image height of the zoom lens at the wide angle end T Representing the actual half-image height of the zoom lens at the telephoto end.
The condition formula (7) is satisfied, the size of an imaging circle of the optical system tends to be stable in the continuous zooming process, pixels realize continuous lossless change, and the shooting effect of images at the wide angle end and the telephoto end is ensured.
In some embodiments, the zoom lens satisfies the following conditional expression:
2.5<(f T +f W )/ΣCT18<7.5；（8）
wherein f is T Representing the effective focal length of the zoom lens at the telephoto end, f W Represents an effective focal length of the zoom lens at a wide-angle end, and Σ CT18 represents a sum of thicknesses of the first lens to the eighth lens on an optical axis.
The condition (8) is met, the center thickness of each lens is reasonably distributed, the better zooming effect is guaranteed while the processing and manufacturing are met, and meanwhile, the total length of the lens is shortened.
In some embodiments, the zoom lens satisfies the following conditional expression:
0.05<BFL W /TL W <0.2；（9）
wherein, BFL W Denotes a back focal length, TL, of the zoom lens at a wide angle end W And a distance on an optical axis from an object side surface of the first lens to the imaging surface at a wide angle end.
Satisfying the above conditional expression (9), a shorter back focal length is obtained in the arrangement in the wide angle state, so that the optical system can be further miniaturized.
In some embodiments, the zoom lens satisfies the following conditional expression:
0.2<BFL T /TL T <0.7；（10）
wherein, BFL T Representing the back focal length, TL, of the zoom lens at the telephoto end T Representing the object side of the first lens at the telephoto end to the image planeDistance on the optical axis.
Satisfying the conditional expression (10) above, a shorter back focus is obtained in the arrangement in the telephoto state, so that the optical system is further miniaturized.
In some embodiments, the zoom lens satisfies the following conditional expression:
0.1<(R61-R62)/(R61+R62)<0.5；（11）
wherein R61 denotes a radius of curvature of an object-side surface of the sixth lens element, and R62 denotes a radius of curvature of an image-side surface of the sixth lens element.
Satisfying the above conditional expression (11), adjusting the surface shapes of the two surfaces of the sixth lens at the paraxial region can slow down the shape change of the sixth lens, reduce the generation of stray light, and improve the manufacturability of the lens.
In some embodiments, the zoom lens satisfies the following conditional expression:
-7<(R81-R82)/(R81+R82)<-1；（12）
wherein R81 denotes a radius of curvature of an object-side surface of the eighth lens element, and R82 denotes a radius of curvature of an image-side surface of the eighth lens element.
Satisfying the above conditional expression (12), the surface shape of the eighth lens element can be adjusted to correct off-axis aberration, and the light can have appropriate incident and emergent angles in the eighth lens element, which is helpful for increasing the area of the imaging surface, and simultaneously, the edge angle of the lens element can be effectively controlled, thereby effectively reducing the generation of flare light.
In some embodiments, the zoom lens satisfies the following conditional expression:
0.5<Y R82 /IH W <0.8；（13）
wherein, Y R82 Denotes a vertical distance, Y, of an inflection point on an image-side surface of the eighth lens element from an optical axis R82 Can be seen in fig. 25, IH W Representing the actual half image height of the zoom lens at the wide-angle end. Satisfy above-mentioned conditional expression (13), anti-camber point position on the image side face of setting up the eighth lens that can be reasonable can revise the coma and the field curvature of off-axis field of view better, is favorable to promoting the imaging quality.
In some embodiments, the zoom lens satisfies the following conditional expression:
0.01mm 3 <CT2×CT3×CT7<0.06mm 3 ；（14）
wherein CT2 denotes a thickness of the second lens on the optical axis, CT3 denotes a thickness of the third lens on the optical axis, and CT7 denotes a thickness of the seventh lens on the optical axis. The central thicknesses of the second lens, the third lens and the seventh lens are reasonably controlled when the conditional expression (14) is satisfied, and the total length of the system is favorably shortened on the premise of satisfying the molding and manufacturing requirements.
In some embodiments, the zoom lens satisfies the following conditional expression:
1.5<ET8/CT8<3.9；（15）
where ET8 denotes an edge thickness of the eighth lens, and CT8 denotes a thickness of the eighth lens on the optical axis. The condition (15) is met, and the thickness ratio of the eighth lens is reasonably controlled, so that the phenomenon that the air trapping phenomenon of the lens is caused by fast plastic filling at the edge of the lens due to overlarge thickness ratio of the lens in the forming process, and the welding line occurs on the final product to influence the imaging effect can be avoided; meanwhile, the thickness ratio is too small, so that the total length of the system is increased, and the miniaturization is not facilitated.
As an embodiment, the zoom lens includes at least one aspheric lens, specifically, an all-plastic aspheric lens may be adopted, and a glass-plastic hybrid matching may also be adopted, so that a good imaging effect can be obtained; in the invention, in order to better reduce the volume and the weight of the lens, the structure of eight plastic aspheric lenses is adopted, so that the cost can be effectively reduced, the aberration can be corrected, and a product with higher performance-price ratio and optical performance can be provided.
In all the embodiments of the invention, in order to realize the continuous lossless zooming of the lens between the wide-angle end and the telephoto end, the continuous lossless zooming is mainly realized by adjusting and changing the air spacing distance between each group and the imaging surface, and the air spacing between the lenses inside each group is kept unchanged; when the spacing distances between the three groups and the imaging surface are adjusted, the zoom lens can achieve good imaging quality, the imaging target surface of the lens is always larger than the photosensitive area of the chip in the zooming process, and pixels are not lost; and the ultra-high definition imaging can be realized by matching with a 50M/108M imaging chip, and the somatosensory effect of a user is greatly improved.
It should be noted that, when the zoom lens is at the wide-angle end, the focal length is short, and the angle of view of shooting is large, but the distant view imaging is not very clear, so the wide-angle end is generally used for shooting close views, especially close views of large scenes; when the zoom lens is at the telephoto end, the focal length is long, the angle of view of shooting is small, but things far away can be shot clearly, so the telephoto end is generally used for shooting long shots, especially local close-ups. The zoom lens can realize 2.3 times of optical continuous lossless zooming from a telephoto end to a wide-angle end, and can meet different use scenes and shooting requirements of users.
The invention is further illustrated below in the following examples. In various embodiments, the thickness, the curvature radius, and the material selection part of each lens in the zoom lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the innovative points of the present invention should be construed as being equivalent substitutions and shall be included within the scope of the present invention.
In each embodiment of the present invention, when an aspherical lens is used as a lens, the surface shape of the aspherical lens satisfies the following equation:
wherein z is the distance rise from the aspheric surface vertex when the aspheric surface is at the position with the height h along the optical axis direction, c is the paraxial curvature of the surface, k is the quadric coefficient, A 2i The coefficient of the aspheric surface type of the 2 i-th order.
First embodiment
Referring to fig. 1 and fig. 2, which are schematic structural diagrams of a zoom lens 100 according to a first embodiment of the present invention at a wide angle end and a telephoto end, respectively, and as can be seen from the diagrams, the zoom lens 100 sequentially includes, from an object side to an image plane S19 along an optical axis: a diaphragm ST, a first group Q1 with positive focal power, a second group Q2 with positive focal power, and a third group Q3 with negative focal power.
The first group Q1 includes, in order from the object side to the image plane, a first lens L1, a second lens L2, and a third lens L3; the second group Q2 includes, in order from the object side to the image plane, a fourth lens L4, a fifth lens L5, and a sixth lens L6; the third group Q3 includes, in order from the object side to the image plane, a seventh lens L7 and an eighth lens L8, and a filter G1.
Specifically, the first lens L1 has positive focal power, the object-side surface S1 of the first lens is a convex surface, and the image-side surface S2 of the first lens is a concave surface;
the second lens L2 has negative focal power, the object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface;
the third lens L3 has negative focal power, the object side surface S5 of the third lens is a concave surface, and the image side surface S6 of the third lens is a convex surface;
the fourth lens element L4 has negative power, the fourth lens element has a concave object-side surface S7, and a convex image-side surface S8 at the paraxial region;
the fifth lens L5 has positive optical power, the object-side surface S9 of the fifth lens is convex at the paraxial region, and the image-side surface S10 of the fifth lens is convex;
the sixth lens element L6 has positive refractive power, and the object-side surface S11 and the image-side surface S12 of the sixth lens element are concave and convex, respectively;
the seventh lens L7 has positive refractive power, the object-side surface S13 of the seventh lens is a concave surface, and the image-side surface S14 of the seventh lens is a convex surface;
the eighth lens element L8 has a negative optical power, an object-side surface S15 of the eighth lens element being concave at the paraxial region, and an image-side surface S16 of the eighth lens element being concave at the paraxial region;
the object-side surface of the filter G1 is S17, and the image-side surface is S18.
The first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6, the seventh lens element L7 and the eighth lens element L8 are all plastic aspheric lens elements.
Specifically, the design parameters of each lens of the zoom lens 100 provided in the present embodiment are shown in table 1.
TABLE 1
Wherein the distance between the first group Q1 and the second group Q2 on the optical axis is T1, the distance between the second group Q2 and the third group Q3 on the optical axis is T2, and the distance between the third group Q3 and the image forming surface S19 is T3, and the continuous lossless zooming of the zoom lens from the wide angle state to the telephoto state or from the telephoto state to the wide angle state is realized by changing the distances T1, T2, T3 between the adjacent groups.
Table 2 shows specific parameter values of the separation distances T1 to T3 on the optical axis between the adjacent two groups and the imaging surface in the wide-angle state (i.e., wide-angle end) and the telephoto state (i.e., telephoto end) of the zoom lens 100 of embodiment 1, and the focal length and maximum angle of view of the zoom lens in this state.
TABLE 2
In the present embodiment, aspheric parameters of the respective lenses in the zoom lens 100 are shown in table 3.
TABLE 3
Referring to fig. 3 to 5 and fig. 6 to 8, f-tan θ distortion curves, paraxial curvature of field curves and axial chromatic aberration curves of the zoom lens 100 at the telephoto end and the wide-angle end are respectively shown. As can be seen from fig. 3 and 6, the optical distortion at the telephoto end and the wide-angle end is controlled within ± 2%, which illustrates that the distortion of the zoom lens 100 is well corrected during the whole zooming process; it can be seen from fig. 4 and 7 that the curvature of field at the telephoto end and the wide-angle end are controlled within ± 0.07mm, which illustrates that the curvature of field of the zoom lens 100 is better corrected in the zooming process; it can be seen from fig. 5 and 8 that the axial chromatic aberration at different wavelengths at the telephoto end and the wide-angle end is controlled within ± 0.04 mm, which illustrates that the axial chromatic aberration of the zoom lens 100 is well corrected in the zooming process; as can be seen from fig. 3 to 5 and 6 to 8, the aberration of the zoom lens 100 is well balanced during the whole zooming process, and the zoom lens has good optical imaging quality.
Second embodiment
Referring to fig. 9 and 10, which are schematic structural diagrams of a zoom lens 200 according to a second embodiment of the present invention at a wide-angle end and a telephoto end, respectively, the zoom lens 200 of the present embodiment is substantially the same as the zoom lens 100 of the first embodiment, except that an image-side surface S2 of a first lens in the zoom lens 200 is a convex surface; the image side surface S4 of the second lens is a concave surface; the fourth lens L4 has positive refractive power; and the thickness and air space between the lenses are different.
Specifically, the design parameters of each lens of the zoom lens 200 according to the present embodiment are shown in table 4.
TABLE 4
Table 5 shows specific parameter values of the separation distances T1 to T3 on the optical axis between the adjacent two groups and the imaging surface when the zoom lens 200 of embodiment 2 is in the wide-angle state (i.e., wide-angle end) and the telephoto state (i.e., telephoto end), and the focal length and maximum angle of view of the zoom lens in this state.
TABLE 5
In the present embodiment, aspheric parameters of the respective lenses in the zoom lens 200 are shown in table 6.
TABLE 6
Referring to fig. 11 to 13 and 14 to 16, f-tan θ distortion curves, paraxial curvature of field curves and axial chromatic aberration curves of the telephoto end and the wide-angle end of the zoom lens 200 are shown, respectively. It can be seen from fig. 11 and 14 that the optical distortion at the telephoto end and the wide-angle end is controlled within ± 2%, which illustrates that the distortion of the zoom lens 200 is well corrected during zooming; as can be seen from fig. 12 and 15, the field curvature at the telephoto end and the wide-angle end is controlled within ± 0.15mm, which illustrates that the field curvature of the zoom lens 200 is better corrected during zooming; it can be seen from fig. 13 and 16 that the axial chromatic aberration at different wavelengths at the telephoto end and the wide-angle end is controlled within ± 0.05 mm, which illustrates that the axial chromatic aberration of the zoom lens 200 is well corrected during zooming; it can be seen from fig. 11 to 13 and 14 to 16 that the aberration of the zoom lens 200 is well balanced during zooming, and the zoom lens has good optical imaging quality.
Third embodiment
Referring to fig. 17 and 18, which are schematic structural diagrams of a zoom lens 300 according to a third embodiment of the present invention at a wide-angle end and a telephoto end, respectively, the zoom lens 300 in this embodiment is substantially the same as the zoom lens 100 in the first embodiment, except that there are differences in relevant parameters such as thickness and air space between lenses.
Specifically, the design parameters of each lens of the zoom lens 300 according to the present embodiment are shown in table 7.
TABLE 7
Table 8 shows specific parameter values of the separation distances T1 to T3 on the optical axis between two adjacent groups and an imaging surface when the zoom lens 300 of embodiment 3 is in a wide angle state (i.e., wide angle end) and a telephoto state (i.e., telephoto end), and the focal length and maximum angle of view of the zoom lens in this state.
TABLE 8
In the present embodiment, aspheric parameters of the respective lenses in the zoom lens 300 are shown in table 9.
TABLE 9
Referring to fig. 19 to 21 and 22 to 24, f-tan θ distortion curves, paraxial curvature of field curves and axial chromatic aberration curves of the telephoto end and the wide-angle end of the zoom lens 300 are shown, respectively. It can be seen from fig. 19 and 22 that the optical distortion at the telephoto end and the wide-angle end is controlled within ± 2%, which illustrates that the distortion of the zoom lens 300 is well corrected during zooming; as can be seen from fig. 20 and 23, the field curvature at the telephoto end and the wide-angle end is controlled within ± 0.17mm, which illustrates that the field curvature of the zoom lens 300 is better corrected during zooming; it can be seen from fig. 21 and 24 that the axial chromatic aberration at different wavelengths at the telephoto end and the wide-angle end is controlled within ± 0.05 mm, which illustrates that the axial chromatic aberration of the zoom lens 300 is well corrected during zooming; it can be seen from fig. 19 to 21 and 22 to 24 that the aberrations of the zoom lens 300 are well balanced during zooming, and the zoom lens has good optical imaging quality.
Referring to table 10, optical characteristics of the zoom lenses provided in the above three embodiments are shown, including the field angle 2 θ at the wide-angle end W Focal length f W Total optical length TL W Actual half image height IH W (ii) a Field angle 2 theta of zoom lens at telephoto end T Focal length f T Total optical length TL T Actual half image height IH T And a correlation value corresponding to each of the aforementioned conditional expressions.
TABLE 10
As can be seen from the f-tan θ distortion curves, the field curvature curves and the axial chromatic aberration curves of the zoom lens at the wide-angle end and the telephoto end in the above embodiments, the zoom lens provided in the embodiments of the present invention can implement continuous zooming without damaging pixels by matching with a large target surface photosensitive chip, and has the advantages of good resolving power and miniaturization in the whole zooming process.
Compared with the prior art, the zoom lens provided by the invention at least has the following advantages:
(1) The diaphragm is designed in a front mode, namely the diaphragm is arranged in front of the first lens, so that the size of the head of the zoom lens is reduced; meanwhile, the diaphragm is positioned at the front end of the optical system, so that the total length of the optical system can be shorter, and the occupation ratio of a lens in the whole space is favorably reduced; and the diaphragm position is not influenced by the movement of the assembly position during zooming, so that the design difficulty of the zooming module can be reduced.
(2) The continuous lossless zooming of the lens is realized and the high imaging quality is kept by reasonably distributing the focal power ratios of the three groups and adjusting and changing the air interval distance between each group and the imaging surface, and meanwhile, the incident light can be effectively converged, the optical total length of the zoom lens is reduced, and the machinability of the lens is improved by reasonably matching the focal length, the surface type, the center thickness, the on-axis distance and the like of each lens.
In summary, according to the zoom lens provided by the present invention, since the focal powers of the groups are reasonably set, and the focal powers, surface shapes, thicknesses, and spacings of the lenses in the groups are reasonably collocated, 2.3 times of continuous optical lossless zooming of the lens from the telephoto end to the wide-angle end can be realized by changing the air spacing distances between the three groups and the imaging surface, and the imaging target surface of the lens is always larger than the photosensitive area of the chip in the zooming process, so that pixels are not lost; meanwhile, the ultra-high definition imaging can be realized by matching with a 50M/108M imaging chip, and the somatosensory effect of a user is greatly improved.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (11)
1. A zoom lens, comprising, in order from an object side to an image plane along an optical axis, three groups: a diaphragm; a first group having positive optical power, a second group having positive optical power, a third group having negative optical power;
the first group of three lenses in total sequentially comprises from the object side to the imaging surface along the optical axis: a first lens with positive focal power, a second lens with negative focal power, and a third lens with negative focal power;
the second group comprises three lenses in total, and the three lenses sequentially comprise the following lenses from the object side to the imaging surface along the optical axis: a fourth lens having a focal power, a fifth lens having a positive focal power, a sixth lens having a positive focal power;
the third group includes two lenses, and includes, in order from the object side to the image plane along the optical axis: a seventh lens with positive focal power, an eighth lens with negative focal power and an optical filter;
wherein, the lenses are not adhered to each other;
the air space between each adjacent group among the first group, the second group and the third group and the imaging surface on the optical axis is variable;
the zoom lens satisfies the following conditional expression:
0.2<(T1 W +T2 W +T3 W )/(T1 T +T2 T +T3 T )<0.6；
wherein, T1 W Represents a separation distance, T2, of the first group and the second group on the optical axis at the wide-angle end W Represents a separation distance on the optical axis of the second group and the third group at the wide-angle end, T3 W Represents a separation distance, T1, of the third group and the imaging plane on the optical axis at the wide-angle end T Represents a separation distance, T2, on the optical axis of the first group and the second group at the telephoto end T Represents a separation distance on the optical axis of the second group and the third group at the telephoto end, T3 T And a separation distance between the third group and the imaging surface on the optical axis at the telephoto end.
2. The zoom lens according to claim 1, wherein:
the object side surface of the first lens is a convex surface;
the image side surface of the second lens is a concave surface;
the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface;
the object side surface of the fourth lens element is concave, and the image side surface of the fourth lens element is convex at a paraxial region;
the object side surface of the fifth lens element is convex at a paraxial region, and the image side surface of the fifth lens element is convex;
the object side surface of the sixth lens element is a concave surface, and the image side surface of the sixth lens element is a convex surface;
the object side surface of the seventh lens element is a concave surface, and the image side surface of the seventh lens element is a convex surface;
an object-side surface of the eighth lens element is concave at a paraxial region thereof, and an image-side surface of the eighth lens element is concave at a paraxial region thereof;
wherein the zoom lens comprises at least one aspheric lens.
3. The zoom lens according to claim 1, wherein the zoom lens satisfies the following conditional expression:
1.3<f T /f W <2.3；
wherein, f T Representing the effective focal length of the zoom lens at the telephoto end, f W An effective focal length of the zoom lens at the wide-angle end is indicated.
4. The zoom lens according to claim 1, wherein the zoom lens satisfies the following conditional expression:
1.1<TL T /TL W <1.8；
wherein TL T Represents the distance, TL, on the optical axis from the object side surface of the first lens to the imaging surface at the telephoto end W And a distance on an optical axis from an object side surface of the first lens to the imaging surface at a wide angle end.
5. The zoom lens according to claim 1, wherein the zoom lens satisfies the following conditional expression:
2<f Q1 /f W <50；
wherein f is Q1 Representing the combined focal length of the first group, f W An effective focal length of the zoom lens at the wide-angle end is indicated.
6. The zoom lens according to claim 1, wherein the zoom lens satisfies the following conditional expression:
0.2<f Q2 /f T <0.65；
wherein f is Q2 Representing the combined focal length of the second group, f T And the effective focal length of the zoom lens at the long focal end is represented.
7. The zoom lens according to claim 1, wherein the zoom lens satisfies the following conditional expression:
-0.5<f Q3 /(f W +f T )<-0.2；
wherein f is Q3 Representing the combined focal length of the third group, f T Representing the effective focal length of the zoom lens at the telephoto end, f W An effective focal length of the zoom lens at the wide-angle end is indicated.
8. The zoom lens according to claim 1, wherein the zoom lens satisfies the following conditional expression:
0.8<IH W /IH T <1.4；
wherein IH W IH representing the actual half image height of the zoom lens at the wide angle end T Representing the actual half-image height of the zoom lens at the telephoto end.
9. The zoom lens according to claim 1, wherein the zoom lens satisfies the following conditional expression:
2.5<(f T +f W )/ΣCT18<7.5；
wherein f is T Representing the effective focal length of the zoom lens at the telephoto end, f W Represents an effective focal length of the zoom lens at a wide-angle end, and Σ CT18 represents a sum of thicknesses of the first lens to the eighth lens on an optical axis.
10. The zoom lens according to claim 1, wherein the fourth lens has a negative power, and wherein the image-side surface of the first lens is a concave surface and the object-side surface of the second lens is a convex surface.
11. The zoom lens according to claim 1, wherein the fourth lens has positive optical power, the image-side surface of the first lens is convex, and the object-side surface of the second lens is concave.
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