CN220773330U - Optical imaging system - Google Patents
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- CN220773330U CN220773330U CN202322094827.0U CN202322094827U CN220773330U CN 220773330 U CN220773330 U CN 220773330U CN 202322094827 U CN202322094827 U CN 202322094827U CN 220773330 U CN220773330 U CN 220773330U
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- 238000012634 optical imaging Methods 0.000 title claims abstract description 132
- 125000006850 spacer group Chemical group 0.000 claims abstract description 228
- 230000003287 optical effect Effects 0.000 claims abstract description 84
- 239000013256 coordination polymer Substances 0.000 claims description 10
- 238000003384 imaging method Methods 0.000 description 26
- 238000010586 diagram Methods 0.000 description 11
- 230000004075 alteration Effects 0.000 description 10
- 230000035945 sensitivity Effects 0.000 description 10
- 201000009310 astigmatism Diseases 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 6
- 230000003071 parasitic effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 230000014509 gene expression Effects 0.000 description 2
- MKYBYDHXWVHEJW-UHFFFAOYSA-N N-[1-oxo-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propan-2-yl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(C(C)NC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 MKYBYDHXWVHEJW-UHFFFAOYSA-N 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
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Abstract
The application discloses an optical imaging system, which comprises a lens barrel, and a six-piece lens group and a spacing element group which are arranged in the lens barrel, wherein the six-piece lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side along an optical axis, the first lens and the sixth lens have negative focal power, the second lens and the fifth lens have positive focal power, and the positive and negative attributes of the focal power of the third lens and the fourth lens are opposite; the spacing element group comprises a second spacing element which is arranged on the image side surface of the second lens and is contacted with the image side surface of the second lens; the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: 1.2< |f3|/f2<3.6, the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, the inner diameter D2s of the object-side surface of the second spacer element and the outer diameter D2s of the object-side surface of the second spacer element satisfy: -3< (R4/R3) × (D2 s/D2 s) < -2.
Description
Technical Field
The application relates to the field of optical devices, in particular to a six-piece optical imaging system.
Background
Electronic products such as smart phones, head-mounted devices, unmanned aerial vehicles and the like are provided with camera lenses so as to achieve the functions of shooting pictures and videos, space recognition, positioning and the like. With the upgrade of electronic products and the development of new functions, the imaging requirements on the camera lens are also higher and higher.
In order to meet the high imaging requirement of the imaging lens, the imaging lens is usually configured in a six-piece type lens, however, the focal power of a part of the lens and the spacing element at the lens position are easy to be unreasonable in design, especially the focal power of the lens close to the object side and the spacing element at the lens position are easy to be unreasonable in design, the unreasonable causes stray light to be generated at the lenses by incident light, and when the size of the spacing element is unreasonable, the spacing element is further caused to shield effective light or can not shield the stray light, so that the imaging quality of the imaging lens is seriously affected.
Disclosure of Invention
The present application provides an optical imaging system that at least solves or partially solves at least one problem, or other problems, present in the prior art.
An aspect of the present application provides an optical imaging system including a lens barrel, and a six-piece lens group and a spacing element group disposed within the lens barrel, the six-piece lens group including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in order from an object side to an image side along an optical axis, wherein the first lens and the sixth lens have negative optical power, the second lens and the fifth lens have positive optical power, and positive and negative properties of the optical power of the third lens and the fourth lens are opposite; the spacing element group comprises a second spacing element which is arranged on the image side surface of the second lens and is contacted with the image side surface of the second lens; wherein, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: 1.2< |f3|/f2<3.6, the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, the inner diameter D2s of the object-side surface of the second spacer element and the outer diameter D2s of the object-side surface of the second spacer element satisfy: -3< (R4/R3) × (D2 s/D2 s) < -2.
According to an exemplary embodiment of the present application, the curvature radius R12 of the image side surface of the sixth lens, the center thickness CT6 of the sixth lens on the optical axis, the inner diameter D0m of the image side end surface of the lens barrel, and the outer diameter D0m of the image side end surface of the lens barrel satisfy: 9.3< (R12/CT 6) × (D0 m/D0 m) <13.8.
According to an exemplary embodiment of the present application, the effective focal length f2 of the second lens, the radius of curvature R4 of the image side of the second lens, the outer diameter D2m of the image side of the second spacer element and the maximum thickness CP2 of the second spacer element satisfy: -8.5< - (f 2/R4) × (D2 m/CP 2) < -6.1.
According to an exemplary embodiment of the present application, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the inner diameter D2m of the image side surface of the second spacing element and the outer diameter D2m of the image side surface of the second spacing element satisfy: (d2m×d2m)/|f2×f3| <1.2.
According to an exemplary embodiment of the present application, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens, the inner diameter D0s of the object side end surface of the lens barrel, and the outer diameter D0s of the object side end surface of the lens barrel satisfy: 0< (d0sxd0s)/(r1×r2) <2.2.
According to one exemplary embodiment of the present application, the length L of the lens barrel in the direction in which the optical axis is located, the air interval T12 of the first lens and the second lens on the optical axis, the air interval T45 of the fourth lens and the fifth lens on the optical axis, and the air interval T56 of the fifth lens and the sixth lens on the optical axis satisfy: 2.6< L/(T12+T45+T56) <3.6.
According to an exemplary embodiment of the present application, the spacer element group further comprises a third spacer element disposed at and in contact with the image side surface of the third lens, wherein the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the inner diameter D3s of the object side surface of the third spacer element and the outer diameter D3s of the object side surface of the third spacer element satisfy: -1.3< (d3sxd3s)/(f3xf4) <0.
According to an exemplary embodiment of the present application, the spacer element group further includes a third spacer element disposed on and in contact with the image side surface of the third lens, wherein a radius of curvature R6 of the image side surface of the third lens, a radius of curvature R7 of the object side surface of the fourth lens, an inner diameter D3m of the image side surface of the third spacer element, and an outer diameter D3m of the image side surface of the third spacer element satisfy: 1.3< (R6/R7) × (D3 m/D3 m) <2.1.
According to an exemplary embodiment of the present application, the spacer element group further includes a fourth spacer element disposed on and in contact with the image side surface of the fourth lens, wherein an effective focal length f4 of the fourth lens, a radius of curvature R8 of the image side surface of the fourth lens, an inner diameter D4m of the image side surface of the fourth spacer element, and an outer diameter D4m of the image side surface of the fourth spacer element satisfy: 0.2< |f4/R8|× (D4 m/D4 m) <1.8.
According to an exemplary embodiment of the present application, the spacer element group further comprises a fourth spacer element disposed at and in contact with the image side of the fourth lens, wherein the total effective focal length f of the optical imaging system, the effective focal length f5 of the fifth lens and the outer diameter D4s of the object side of the fourth spacer element satisfy: 0.5< d4 s/(f+f5) <1.1.
According to an exemplary embodiment of the present application, the spacer element group further includes a fifth spacer element disposed at and in contact with the image side surface of the fifth lens, wherein an effective focal length f5 of the fifth lens, an effective focal length f6 of the sixth lens, an inner diameter D5s of the object side surface of the fifth spacer element, an outer diameter D5s of the object side surface of the fifth spacer element, an inner diameter D5m of the image side surface of the fifth spacer element and an outer diameter D5m of the image side surface of the fifth spacer element satisfy: 0< (D5s+D5m-D5 s-D5 m)/(f 5-f 6) <1.
According to an exemplary embodiment of the present application, the spacer element group further includes a third spacer element disposed at and in contact with the image side surface of the third lens and a fourth spacer element disposed at and in contact with the image side surface of the fourth lens, wherein an air space T34 of the third lens and the fourth lens on the optical axis, a center thickness CT4 of the fourth lens on the optical axis, a maximum thickness CP3 of the third spacer element, and a space EP34 of the third spacer element and the fourth spacer element along the optical axis satisfy: 1.1< (T34+CT4)/(CP3+EP 34) <2.5.
According to an exemplary embodiment of the present application, the spacer element group further includes a fourth spacer element disposed at and in contact with the image side surface of the fourth lens and a fifth spacer element disposed at and in contact with the image side surface of the fifth lens, wherein an effective focal length f4 of the fourth lens, an effective focal length f5 of the fifth lens, an effective focal length f6 of the sixth lens, a maximum thickness CP4 of the fourth spacer element, a maximum thickness CP5 of the fifth spacer element, and a spacing EP45 of the fourth spacer element and the fifth spacer element along the optical axis satisfy: (CP 4+ EP45+ CP 5)/|f4 + f5+ f6| <0.3.
According to an exemplary embodiment of the present application, the spacer element group further includes a fourth spacer element disposed at and in contact with the image side surface of the fourth lens and a fifth spacer element disposed at and in contact with the image side surface of the fifth lens, wherein a combined focal length f34 of the third lens and the fourth lens, a combined focal length f56 of the fifth lens and the sixth lens, an inner diameter d4s of the object side surface of the fourth spacer element and an inner diameter d5s of the object side surface of the fifth spacer element satisfy: 0.4< |f56/f34|× (d 5s/d4 s) <2.5.
According to an exemplary embodiment of the present application, the spacer element group further includes a third spacer element disposed at and in contact with the image side surface of the third lens, a fourth spacer element disposed at and in contact with the image side surface of the fourth lens, and a fifth spacer element disposed at and in contact with the image side surface of the fifth lens, wherein the total effective focal length f of the optical imaging system, the maximum thickness CP2 of the second spacer element, the maximum thickness CP3 of the third spacer element, the maximum thickness CP4 of the fourth spacer element, and the maximum thickness CP5 of the fifth spacer element satisfy: 2.1< f/(CP 2+ CP3+ CP4+ CP 5) <5.2.
According to the six-piece optical imaging system provided by the application, under the condition that the effective focal length of the second lens and the third lens is 1.2< |f3|/f2<3.6, the principal ray in the incident ray can be ensured to be transmitted according to the preset path by reasonably configuring the correlations between the object side surface of the second lens, the curvature radius of the image side surface and the inner diameter and the outer diameter of the object side surface of the second interval element, and the stray light generated by the incident ray at the third lens can be effectively shielded by the second interval element under the condition that the principal ray path in the incident ray is not influenced, so that the imaging quality of the optical imaging system is improved.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings, in which:
FIG. 1 shows a schematic structural diagram of an optical imaging system according to the present application;
FIG. 2 shows a parasitic schematic diagram of an optical imaging system under the condition that |f3|/f2 is less than or equal to 1.2 or |f3|/f2 is more than or equal to 3.6;
FIG. 3 shows a parasitic schematic diagram of an optical imaging system under conditions of 1.2< |f3|/f2< 3.6;
fig. 4 shows a schematic structural view of an optical imaging system according to embodiment 1 of the present application;
fig. 5 shows a schematic structural view of an optical imaging system according to embodiment 2 of the present application;
fig. 6 shows a schematic structural diagram of an optical imaging system according to embodiment 3 of the present application;
fig. 7A to 7C show on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the optical imaging systems according to embodiments 1, 2, and 3 of the present application, respectively;
fig. 8 shows a schematic structural view of an optical imaging system according to embodiment 4 of the present application;
fig. 9 shows a schematic configuration diagram of an optical imaging system according to embodiment 5 of the present application;
fig. 10 shows a schematic structural diagram of an optical imaging system according to embodiment 6 of the present application;
Fig. 11A to 11C show on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the optical imaging systems according to embodiments 4, 5, and 6 of the present application, respectively;
fig. 12 shows a schematic configuration diagram of an optical imaging system according to embodiment 7 of the present application;
fig. 13 shows a schematic structural view of an optical imaging system according to embodiment 8 of the present application;
fig. 14 shows a schematic structural view of an optical imaging system according to embodiment 9 of the present application; and
fig. 15A to 15C show on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the optical imaging systems according to embodiments 7, 8, and 9 of the present application, respectively.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. Specifically, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when describing embodiments of the present application, use of "may" means "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
A first aspect of the present application provides an optical imaging system that may include a lens barrel and a six-piece lens group disposed within the lens barrel, the six-piece lens group may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in order from an object side to an image side along an optical axis. In the first lens to the sixth lens, any adjacent two lenses may have an air space therebetween. Wherein the first lens and the sixth lens have negative optical power, the second lens and the fifth lens have positive optical power, and the positive and negative properties of the optical power of the third lens and the fourth lens are opposite.
In an exemplary embodiment, the optical imaging system may further include a spacer element group disposed within the lens barrel. The set of spacing elements may include one or more of a second spacing element, a third spacing element, a fourth spacing element, and a fifth spacing element. The second spacing element is arranged on the image side surface of the second lens and is at least partially contacted with the image side surface of the second lens, the third spacing element is arranged on the image side surface of the third lens and is at least partially contacted with the image side surface of the third lens, the fourth spacing element is arranged on the image side surface of the fourth lens and is at least partially contacted with the image side surface of the fourth lens, and the fifth spacing element is arranged on the image side surface of the fifth lens and is at least partially contacted with the image side surface of the fifth lens. The reasonable use of the spacing element can effectively avoid the stray light risk, reduce the interference to the image quality, and further improve the imaging quality of the optical imaging system.
In an exemplary embodiment, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens may satisfy: 1.2< |f3|/f2<3.6, and the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, the inner diameter D2s of the object-side surface of the second spacing element and the outer diameter D2s of the object-side surface of the second spacing element may satisfy: -3< (R4/R3) × (D2 s/D2 s) < -2. Under the condition that the effective focal lengths of the second lens and the third lens meet 1.2< |f3|/f2<3.6, the correlations among the object side surface of the second lens, the curvature radius of the image side surface and the inner diameter and the outer diameter of the object side surface of the second interval element are reasonably configured, so that the transmission of the principal ray in the incident ray according to a preset path can be ensured, the second interval element can effectively shield the stray light generated by the incident ray at the third lens under the condition that the principal ray path in the incident ray is not influenced, and the imaging quality of the optical imaging system is improved. Fig. 2 shows a parasitic light schematic diagram of the optical imaging system under the condition that |f3|/f2 is less than or equal to 1.2 or |f3|/f2 is more than or equal to 3.6, fig. 3 shows a parasitic light schematic diagram of the optical imaging system under the condition that 1.2< |f3|/f2<3.6, and from the view of fig. 2 and 3, the parasitic light of the optical imaging system can be obviously reduced by enabling the optical imaging system to meet 1.2< |f3|/f2< 3.6.
In the exemplary embodiment, the radius of curvature R12 of the image side surface of the sixth lens, the center thickness CT6 of the sixth lens on the optical axis, the inner diameter D0m of the image side end surface of the lens barrel, and the outer diameter D0m of the image side end surface of the lens barrel may satisfy: 9.3< (R12/CT 6) × (D0 m/D0 m) <13.8. The correlations between the radius of curvature of the image side surface of the sixth lens, the center thickness of the sixth lens on the optical axis, and the inner and outer diameters of the image side end surface of the lens barrel are reasonably arranged, so that not only can the workability of the sixth lens be improved, but also the radial dimension of the sixth lens and the optical overall length of the optical imaging system can be reduced, thereby limiting the overall dimension of the optical imaging system.
In an exemplary embodiment, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens may satisfy: 1.2< |f3|/f2<3.6, the effective focal length f2 of the second lens, the radius of curvature R4 of the image side of the second lens, the outer diameter D2m of the image side of the second spacing element and the maximum thickness CP2 of the second spacing element satisfy: -8.5< - (f 2/R4) × (D2 m/CP 2) < -6.1. Under the condition that the effective focal length of the second lens and the third lens meets 1.2< |f3|/f2<3.6, the interrelationship among the effective focal length of the second lens, the curvature radius of the image side surface of the second lens, the outer diameter of the image side surface of the second interval element and the maximum thickness of the second interval element is reasonably configured, so that the deflection angle of the edge view field in the second lens can be adjusted, the transmission of principal rays in incident rays according to a preset path is ensured, the sensitivity of the second lens and the third lens is effectively reduced, and the performance of an optical imaging system is improved.
Table a is a schematic diagram of the sensitivity of the optical imaging system under the condition that |f3|/f2 is less than or equal to 1.2 or |f3|/f2 is more than or equal to 3.6, and Table b is a schematic diagram of the sensitivity of the optical imaging system under the condition that 1.2< |f3|/f2< 3.6.
Table a
Table b
In an exemplary embodiment, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the inner diameter D2m of the image side surface of the second spacing element, and the outer diameter D2m of the image side surface of the second spacing element may satisfy: (d2m×d2m)/|f2×f3| <1.2. The effective focal length of the second lens, the effective focal length of the third lens, the inner diameter of the image side surface of the second interval element and the outer diameter of the image side surface of the second interval element are reasonably configured, so that the second interval element can effectively shield stray light generated by the incident light on the second lens under the condition that the main light ray path in the incident light is not influenced.
In an exemplary embodiment, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens, the inner diameter D0s of the object side end surface of the lens barrel, and the outer diameter D0s of the object side end surface of the lens barrel may satisfy: 0< (d0sxd0s)/(r1×r2) <2.2. By controlling the curvature radiuses of the object side surface and the image side surface of the first lens, the deflection angle of the edge view field in the first lens can be adjusted, the transmission of the principal ray in the incident ray according to a preset path is ensured, and meanwhile, the head size of the optical imaging system can be limited by matching the inner diameter and the outer diameter of the object side end surface of the reasonable lens barrel, so that the maximum half view angle of the optical imaging system is limited.
In the exemplary embodiment, the length L of the lens barrel in the direction of the optical axis, the air space T12 of the first and second lenses on the optical axis, the air space T45 of the fourth and fifth lenses on the optical axis, and the air space T56 of the fifth and sixth lenses on the optical axis may satisfy: 2.6< L/(T12+T45+T56) <3.6. The length of the lens barrel in the direction of the optical axis, the air interval of the first lens and the second lens on the optical axis, the air interval of the fourth lens and the fifth lens on the optical axis and the air interval of the fifth lens and the sixth lens on the optical axis are reasonably configured, so that the structure of the lens group is more compact, and good matching between the image side end face of the lens barrel and the lens group can be realized.
In an exemplary embodiment, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the inner diameter D3s of the object side surface of the third spacing element, and the outer diameter D3s of the object side surface of the third spacing element may satisfy: -1.3< (d3sxd3s)/(f3xf4) <0. The radial dimension of the third interval element can be restrained by reasonably configuring the interrelationship between the effective focal length of the third lens, the effective focal length of the fourth lens and the inner diameter and the outer diameter of the object side surface of the third interval element, which is beneficial to reducing the overall dimension of the optical imaging system and reducing the influence of stray light.
In an exemplary embodiment, the radius of curvature R6 of the image side of the third lens, the radius of curvature R7 of the object side of the fourth lens, the inner diameter D3m of the image side of the third spacing element, and the outer diameter D3m of the image side of the third spacing element may satisfy: 1.3< (R6/R7) × (D3 m/D3 m) <2.1. By controlling the curvature radius of the image side surface of the third lens and the curvature radius of the object side surface of the fourth lens, the deflection angle of the edge view field in the fourth lens can be adjusted, the transmission of the principal ray in the incident ray according to a preset path is ensured, the sensitivity of an optical imaging system is effectively reduced, and meanwhile, the inner and outer diameters of the image side surface of the third spacing element are reasonably matched, so that the third spacing element can effectively shield stray light generated by the incident ray in the fourth lens under the condition that the path of the principal ray in the incident ray is not influenced.
In an exemplary embodiment, the effective focal length f4 of the fourth lens, the curvature radius R8 of the image side surface of the fourth lens, the inner diameter D4m of the image side surface of the fourth spacing element, and the outer diameter D4m of the image side surface of the fourth spacing element may satisfy: 0.2< |f4/R8|× (D4 m/D4 m) <1.8. The deflection angle of the edge view field in the fourth lens can be adjusted by controlling the effective focal length of the fourth lens and the curvature radius of the image side surface of the fourth lens, so that the transmission of the principal ray in the incident ray according to a preset path is ensured, the sensitivity of an optical imaging system is effectively reduced, and meanwhile, the stray light generated by the incident ray in the fourth lens can be effectively shielded by the fourth spacing element under the condition that the path of the principal ray in the incident ray is not influenced by the reasonable inner and outer diameters of the image side surface of the fourth spacing element.
In an exemplary embodiment, the total effective focal length f of the optical imaging system, the effective focal length f5 of the fifth lens, and the outer diameter D4s of the object side surface of the fourth spacing element may satisfy: 0.5< d4 s/(f+f5) <1.1. The interrelationship among the total effective focal length of the optical imaging system, the effective focal length of the fifth lens and the outer diameter of the object side surface of the fourth interval element is reasonably configured, so that the radial dimension of the fourth interval element can be restrained, and the whole dimension of the optical imaging system is reduced.
In an exemplary embodiment, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the inner diameter D5s of the object-side surface of the fifth spacing element, the outer diameter D5s of the object-side surface of the fifth spacing element, the inner diameter D5m of the image-side surface of the fifth spacing element, and the outer diameter D5m of the image-side surface of the fifth spacing element may satisfy: 0< (D5s+D5m-D5 s-D5 m)/(f 5-f 6) <1. By controlling the effective focal lengths of the fifth lens and the sixth lens, the imaging quality of the optical imaging system can be improved, the sensitivities of the fifth lens and the sixth lens are restrained, and meanwhile, the inner diameter and the outer diameter of the fifth spacing element are reasonably selected according to the sensitivities of the fifth lens and the sixth lens, so that the assembly stability of the optical imaging system can be improved.
In an exemplary embodiment, the air interval T34 of the third lens and the fourth lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, the maximum thickness CP3 of the third interval element, and the interval EP34 of the third interval element and the fourth interval element along the optical axis may satisfy: 1.1< (T34+CT4)/(CP3+EP 34) <2.5. The air interval of the third lens and the fourth lens on the optical axis, the center thickness of the fourth lens on the optical axis, the maximum thickness of the third interval element and the mutual relation between the intervals of the third interval element and the fourth interval element along the optical axis are reasonably configured, so that the positions of the third lens and the fourth lens are effectively limited, the structural compactness of the optical imaging system is improved, the off-axis aberration is corrected, and the overall image quality of the optical imaging system is improved.
In an exemplary embodiment, the effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the maximum thickness CP4 of the fourth spacing element, the maximum thickness CP5 of the fifth spacing element, and the spacing EP45 of the fourth spacing element and the fifth spacing element along the optical axis may satisfy: (CP 4+ EP45+ CP 5)/|f4 + f5+ f6| <0.3. The ratio of the maximum thickness of the fourth interval element, the interval between the fourth interval element and the fifth interval element along the optical axis and the maximum thickness of the fifth interval element to the sum of the effective focal lengths of the fourth lens and the sixth lens is controlled within a reasonable range, so that the optical power of each lens can be reasonably distributed, the relative positions of the fourth lens, the fifth lens and the sixth lens can be clearly determined, the structure of the optical imaging system is more compact, and the imaging quality of the optical imaging system is improved.
In an exemplary embodiment, the combined focal length f34 of the third lens and the fourth lens, the combined focal length f56 of the fifth lens and the sixth lens, the inner diameter d4s of the object side surface of the fourth spacing element, and the inner diameter d5s of the object side surface of the fifth spacing element may satisfy: 0.4< |f56/f34|× (d 5s/d4 s) <2.5. By controlling the combined focal length of the third lens and the fourth lens and the combined focal length of the fifth lens and the sixth lens, the relative positions of the third lens, the fourth lens, the fifth lens and the sixth lens can be reasonably configured, the imaging quality of the optical imaging system is improved, and meanwhile, the fourth spacer element and the fifth spacer element can effectively shield stray light under the condition that the main ray path in incident rays is not affected by matching with the reasonable inner diameters of the object sides of the fourth spacer element and the fifth spacer element.
In an exemplary embodiment, the total effective focal length f of the optical imaging system, the maximum thickness CP2 of the second spacer element, the maximum thickness CP3 of the third spacer element, the maximum thickness CP4 of the fourth spacer element, and the maximum thickness CP5 of the fifth spacer element may satisfy: 2.1< f/(CP 2+ CP3+ CP4+ CP 5) <5.2. The ratio of the total effective focal length of the optical imaging system to the sum of the maximum thicknesses of all the interval elements from the second interval element to the fifth interval element is controlled within a certain range, so that the distance between the lenses can be reasonably distributed, the total optical length of the optical imaging system is further restrained, the gap sensitivity is reduced, and the imaging quality of the optical imaging system is improved.
The optical imaging system according to the above-described embodiments of the present application may employ six lenses and at least one spacer element. By reasonably distributing parameters of each lens and each interval element, the structure of the optical imaging system can be more compact, the sensitivity of the optical imaging system is reduced, the stray light phenomenon of the optical imaging system is improved, and the assembly stability and the imaging quality of the optical imaging system are improved.
In an embodiment of the present application, at least one of the surfaces of each of the first to sixth lenses is an aspherical surface. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring during imaging can be eliminated as much as possible, thereby improving imaging quality. Optionally, the object side surface and the image side surface of each of the first lens element to the sixth lens element are aspheric surfaces.
However, those skilled in the art will appreciate that the number of lenses and spacer elements making up the optical imaging system may be varied to achieve the various results and advantages described in the specification without departing from the technical solutions claimed herein.
A second aspect of the present application provides an optical imaging system that may include a barrel and a six-piece lens group and a spacer element group disposed within the barrel. The six-piece lens group may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, which are sequentially arranged from the object side to the image side along the optical axis. Wherein the first lens and the sixth lens have negative optical power, the second lens and the fifth lens have positive optical power, and the positive and negative properties of the optical power of the third lens and the fourth lens are opposite.
The curvature radius R12 of the image side surface of the sixth lens, the center thickness CT6 of the sixth lens on the optical axis, the inner diameter D0m of the image side end surface of the lens barrel, and the outer diameter D0m of the image side end surface of the lens barrel may satisfy: 9.3< (R12/CT 6) × (D0 m/D0 m) <13.8. The correlations between the radius of curvature of the image side surface of the sixth lens, the center thickness of the sixth lens on the optical axis, and the inner and outer diameters of the image side end surface of the lens barrel are reasonably arranged, so that not only can the workability of the sixth lens be improved, but also the radial dimension of the sixth lens and the optical overall length of the optical imaging system can be reduced, thereby limiting the overall dimension of the optical imaging system.
A third aspect of the present application provides an optical imaging system that may include a barrel and a six-piece lens group and a spacer element group disposed within the barrel. The six-piece lens group may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, which are sequentially arranged from the object side to the image side along the optical axis. Wherein the first lens and the sixth lens have negative optical power, the second lens and the fifth lens have positive optical power, and the positive and negative properties of the optical power of the third lens and the fourth lens are opposite. The object side surface of the sixth lens is a concave surface, and the image side surface is a concave surface. The set of spacing elements may include a second spacing element disposed on and at least partially in contact with the image side of the second lens.
The effective focal length f2 of the second lens and the effective focal length f3 of the third lens may satisfy: 1.2< |f3|/f2<3.6, the effective focal length f2 of the second lens, the radius of curvature R4 of the image side of the second lens, the outer diameter D2m of the image side of the second spacing element, and the maximum thickness CP2 of the second spacing element may satisfy: -8.5< - (f 2/R4) × (D2 m/CP 2) < -6.1. Under the condition that the effective focal length of the second lens and the third lens meets 1.2< |f3|/f2<3.6, the interrelationship among the effective focal length of the second lens, the curvature radius of the image side surface of the second lens, the outer diameter of the image side surface of the second interval element and the maximum thickness of the second interval element is reasonably configured, so that the deflection angle of the edge view field in the second lens can be adjusted, the transmission of principal rays in incident rays according to a preset path is ensured, the sensitivity of the second lens and the third lens is effectively reduced, and the performance of an optical imaging system is improved.
Specific examples of the optical imaging system applicable to the above-described embodiments are further described below with reference to the accompanying drawings.
Example 1
An optical imaging system according to embodiment 1 of the present application is described below with reference to fig. 4.
As shown in fig. 4, the optical imaging systems 100 each include a lens barrel P0, and a six-piece lens group and a spacer element group disposed within the lens barrel P0, the six-piece lens group including, in order from an object side to an image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. The stop STO may be disposed between the first lens E1 and the second lens E2. The spacer element group includes: a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5. The spacing element can block excessive light rays in the imaging process from entering the next lens, and meanwhile, the lens and the lens barrel P0 are better supported, so that the structural stability of the optical imaging system is enhanced.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The filter has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
Table 1 shows the basic parameter table of the optical imaging system of example 1, in which the radius of curvature, thickness/distance are each in millimeters (mm).
TABLE 1
In the present embodiment, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspheric, and the surface shape x of each aspheric lens can be defined by, but not limited to, the following aspheric formula:
wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. Table 2 shows the higher order coefficients A that can be used for each of the aspherical surfaces S1-S12 in example 1 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 1.6475E-02 | -2.9418E-02 | 1.3356E-02 | 3.2498E-03 | -5.5989E-03 | 2.0234E-03 | -2.4563E-04 |
| S2 | 4.5711E-02 | -3.9262E-02 | 4.1752E-01 | -1.4360E+00 | 2.7160E+00 | -2.4698E+00 | 9.1195E-01 |
| S3 | -3.0185E-02 | 1.0407E-01 | -8.0902E-01 | 2.4370E+00 | -4.2066E+00 | 3.7463E+00 | -1.4124E+00 |
| S4 | -1.3840E-01 | 9.5095E-02 | -4.5605E-01 | 1.3010E+00 | -1.6499E+00 | 9.5701E-01 | -2.1147E-01 |
| S5 | -3.1067E-01 | 8.5990E-01 | -3.2537E+00 | 6.6652E+00 | -7.4875E+00 | 4.4153E+00 | -1.0706E+00 |
| S6 | -2.6168E-01 | 1.5311E+00 | -4.2902E+00 | 6.8184E+00 | -6.2683E+00 | 3.1374E+00 | -6.6039E-01 |
| S7 | -1.5930E-01 | 4.9473E-01 | -7.8950E-01 | 6.0076E-01 | -2.1069E-01 | 6.8242E-02 | -2.4392E-02 |
| S8 | -1.2153E-01 | -2.3707E-01 | 4.6005E-01 | -2.7571E-01 | -1.0469E-01 | 2.0333E-01 | -6.2846E-02 |
| S9 | 1.2199E-01 | -4.2744E-01 | 4.8123E-01 | -1.7487E-01 | -9.2124E-02 | 1.0441E-01 | -2.7607E-02 |
| S10 | -4.2938E-02 | 9.7784E-02 | -3.3794E-01 | 5.9023E-01 | -4.8967E-01 | 1.9692E-01 | -3.1103E-02 |
| S11 | -1.3601E-01 | -1.3130E-01 | 3.8923E-01 | -3.2419E-01 | 1.1775E-01 | -1.2560E-02 | -1.1759E-03 |
| S12 | -2.5364E-01 | 1.2568E-01 | -2.2101E-02 | -1.5392E-02 | 8.9876E-03 | -1.4715E-03 | 4.9850E-07 |
TABLE 2
Example 2
An optical imaging system according to embodiment 2 of the present application is described below with reference to fig. 5.
As shown in fig. 5, the optical imaging systems 200 each include a lens barrel P0, and a six-piece lens group and a spacer element group disposed within the lens barrel P0, the six-piece lens group including, in order from an object side to an image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. The stop STO may be disposed between the first lens E1 and the second lens E2. The spacer element group includes: a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5.
The lens of this embodiment has the same structure as that of the lens of embodiment 1, that is, the basic parameter table of the optical imaging system of this embodiment is the same as table 1, and the aspherical coefficient table is the same as table 2. This embodiment differs from embodiment 1 in that: the lens barrel P0, the second interval element P2, the third interval element P3, the fourth interval element P4, and the fifth interval element P5 are different in structural size. For example, the number of the cells to be processed, an inner diameter D2s of the object side of the second spacer element, an inner diameter D2m of the image side of the second spacer element, an outer diameter D2s of the object side of the second spacer element, an inner diameter D2m of the image side of the second spacer element, an inner diameter D3s of the object side of the third spacer element, an inner diameter D3m of the image side of the third spacer element, an outer diameter D3s of the object side of the third spacer element, an outer diameter D3m of the image side of the third spacer element, an inner diameter D4s of the object side of the fourth spacer element, an inner diameter D4m of the image side of the fourth spacer element, an outer diameter D4m of the image side of the fourth spacer element, an inner diameter D5s of the object side of the fifth spacer element the parameters of the inner diameter D5m of the image side surface of the fifth spacing element, the outer diameter D5s of the object side surface of the fifth spacing element, the outer diameter D5m of the image side surface of the fifth spacing element, the inner diameter D0s of the object side end surface of the lens barrel, the inner diameter D0m of the image side end surface of the lens barrel, the outer diameter D0s of the object side end surface of the lens barrel, the outer diameter D0m of the image side end surface of the lens barrel, the maximum thickness CP2 of the second spacing element, the maximum thickness CP3 of the third spacing element, the spacing EP34 of the third spacing element and the fourth spacing element along the optical axis, the maximum thickness CP4 of the fourth spacing element, the spacing EP45 of the fourth spacing element and the fifth spacing element along the optical axis, the maximum thickness CP5 of the fifth spacing element, and the length L of the lens barrel in the direction in which the optical axis is located are different.
Example 3
An optical imaging system according to embodiment 3 of the present application is described below with reference to fig. 6.
As shown in fig. 6, the optical imaging systems 300 each include a lens barrel P0, and a six-piece lens group and a spacer element group disposed within the lens barrel P0, the six-piece lens group including, in order from an object side to an image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. The stop STO may be disposed between the first lens E1 and the second lens E2. The spacer element group includes: a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5.
The lens of this embodiment has the same structure as that of the lens of embodiment 1, that is, the basic parameter table of the optical imaging system of this embodiment is the same as table 1, and the aspherical coefficient table is the same as table 2. This embodiment differs from embodiment 1 in that: the lens barrel P0, the second interval element P2, the third interval element P3, the fourth interval element P4, and the fifth interval element P5 are different in structural size. For example, the number of the cells to be processed, an inner diameter D2s of the object side of the second spacer element, an inner diameter D2m of the image side of the second spacer element, an outer diameter D2s of the object side of the second spacer element, an inner diameter D2m of the image side of the second spacer element, an inner diameter D3s of the object side of the third spacer element, an inner diameter D3m of the image side of the third spacer element, an outer diameter D3s of the object side of the third spacer element, an outer diameter D3m of the image side of the third spacer element, an inner diameter D4s of the object side of the fourth spacer element, an inner diameter D4m of the image side of the fourth spacer element, an outer diameter D4m of the image side of the fourth spacer element, an inner diameter D5s of the object side of the fifth spacer element the parameters of the inner diameter D5m of the image side surface of the fifth spacing element, the outer diameter D5s of the object side surface of the fifth spacing element, the outer diameter D5m of the image side surface of the fifth spacing element, the inner diameter D0s of the object side end surface of the lens barrel, the inner diameter D0m of the image side end surface of the lens barrel, the outer diameter D0s of the object side end surface of the lens barrel, the outer diameter D0m of the image side end surface of the lens barrel, the maximum thickness CP2 of the second spacing element, the maximum thickness CP3 of the third spacing element, the spacing EP34 of the third spacing element and the fourth spacing element along the optical axis, the maximum thickness CP4 of the fourth spacing element, the spacing EP45 of the fourth spacing element and the fifth spacing element along the optical axis, the maximum thickness CP5 of the fifth spacing element, and the length L of the lens barrel in the direction in which the optical axis is located are different.
Fig. 7A shows on-axis chromatic aberration curves of the optical imaging systems of embodiments 1, 2, and 3, which represent the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging systems. Fig. 7B shows astigmatism curves of the optical imaging systems of embodiments 1, 2, and 3, which represent meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Fig. 7C shows distortion curves of the optical imaging systems of embodiments 1, 2, and 3, which represent distortion magnitude values corresponding to different image heights. As can be seen from fig. 7A to 7C, the optical imaging systems given in embodiments 1, 2 and 3 can achieve good imaging quality.
Example 4
An optical imaging system according to embodiment 4 of the present application is described below with reference to fig. 8.
As shown in fig. 8, the optical imaging systems 400 each include a lens barrel P0, and a six-piece lens group and a spacer element group disposed within the lens barrel P0, the six-piece lens group including, in order from an object side to an image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. The stop STO may be disposed between the first lens E1 and the second lens E2. The spacer element group includes: a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5. The spacing element can block excessive light rays in the imaging process from entering the next lens, and meanwhile, the lens and the lens barrel P0 are better supported, so that the structural stability of the optical imaging system is enhanced.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The filter has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
Table 3 shows the basic parameter table of the optical imaging system of example 4, in which the unit of radius of curvature, thickness/distance is millimeter (mm).
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TABLE 3 Table 3
In the present embodiment, the object side surface and the image side surface of any one of the first to sixth lenses E1 to E6 are aspherical surfaces. Table 4 shows the higher order coefficients A that can be used for each of the aspherical surfaces S1-S12 in example 4 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
TABLE 4 Table 4
Example 5
An optical imaging system according to embodiment 5 of the present application is described below with reference to fig. 9.
As shown in fig. 9, the optical imaging systems 500 each include a lens barrel P0, and a six-piece lens group and a spacer element group disposed within the lens barrel P0, the six-piece lens group including, in order from an object side to an image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. The stop STO may be disposed between the first lens E1 and the second lens E2. The spacer element group includes: a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5.
The lens of this embodiment has the same structure as that of the lens of embodiment 4, that is, the basic parameter table of the optical imaging system of this embodiment is the same as table 3, and the aspherical coefficient table is the same as table 4. This embodiment differs from embodiment 4 in that: the lens barrel P0, the second interval element P2, the third interval element P3, the fourth interval element P4, and the fifth interval element P5 are different in structural size. For example, the number of the cells to be processed, an inner diameter D2s of the object side of the second spacer element, an inner diameter D2m of the image side of the second spacer element, an outer diameter D2s of the object side of the second spacer element, an inner diameter D2m of the image side of the second spacer element, an inner diameter D3s of the object side of the third spacer element, an inner diameter D3m of the image side of the third spacer element, an outer diameter D3s of the object side of the third spacer element, an outer diameter D3m of the image side of the third spacer element, an inner diameter D4s of the object side of the fourth spacer element, an inner diameter D4m of the image side of the fourth spacer element, an outer diameter D4m of the image side of the fourth spacer element, an inner diameter D5s of the object side of the fifth spacer element the parameters of the inner diameter D5m of the image side surface of the fifth spacing element, the outer diameter D5s of the object side surface of the fifth spacing element, the outer diameter D5m of the image side surface of the fifth spacing element, the inner diameter D0s of the object side end surface of the lens barrel, the inner diameter D0m of the image side end surface of the lens barrel, the outer diameter D0s of the object side end surface of the lens barrel, the outer diameter D0m of the image side end surface of the lens barrel, the maximum thickness CP2 of the second spacing element, the maximum thickness CP3 of the third spacing element, the spacing EP34 of the third spacing element and the fourth spacing element along the optical axis, the maximum thickness CP4 of the fourth spacing element, the spacing EP45 of the fourth spacing element and the fifth spacing element along the optical axis, the maximum thickness CP5 of the fifth spacing element, and the length L of the lens barrel in the direction in which the optical axis is located are different.
Example 6
An optical imaging system according to embodiment 6 of the present application is described below with reference to fig. 10.
As shown in fig. 10, the optical imaging systems 600 each include a lens barrel P0, and a six-piece lens group and a spacer element group disposed within the lens barrel P0, the six-piece lens group including, in order from an object side to an image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. The stop STO may be disposed between the first lens E1 and the second lens E2. The spacer element group includes: a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5.
The lens of this embodiment has the same structure as that of the lens of embodiment 4, that is, the basic parameter table of the optical imaging system of this embodiment is the same as table 3, and the aspherical coefficient table is the same as table 4. This embodiment differs from embodiment 4 in that: the lens barrel P0, the second interval element P2, the third interval element P3, the fourth interval element P4, and the fifth interval element P5 are different in structural size. For example, the number of the cells to be processed, an inner diameter D2s of the object side of the second spacer element, an inner diameter D2m of the image side of the second spacer element, an outer diameter D2s of the object side of the second spacer element, an inner diameter D2m of the image side of the second spacer element, an inner diameter D3s of the object side of the third spacer element, an inner diameter D3m of the image side of the third spacer element, an outer diameter D3s of the object side of the third spacer element, an outer diameter D3m of the image side of the third spacer element, an inner diameter D4s of the object side of the fourth spacer element, an inner diameter D4m of the image side of the fourth spacer element, an outer diameter D4m of the image side of the fourth spacer element, an inner diameter D5s of the object side of the fifth spacer element the parameters of the inner diameter D5m of the image side surface of the fifth spacing element, the outer diameter D5s of the object side surface of the fifth spacing element, the outer diameter D5m of the image side surface of the fifth spacing element, the inner diameter D0s of the object side end surface of the lens barrel, the inner diameter D0m of the image side end surface of the lens barrel, the outer diameter D0s of the object side end surface of the lens barrel, the outer diameter D0m of the image side end surface of the lens barrel, the maximum thickness CP2 of the second spacing element, the maximum thickness CP3 of the third spacing element, the spacing EP34 of the third spacing element and the fourth spacing element along the optical axis, the maximum thickness CP4 of the fourth spacing element, the spacing EP45 of the fourth spacing element and the fifth spacing element along the optical axis, the maximum thickness CP5 of the fifth spacing element, and the length L of the lens barrel in the direction in which the optical axis is located are different.
Fig. 11A shows on-axis chromatic aberration curves of the optical imaging systems of examples 4, 5, and 6, which represent the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging systems. Fig. 11B shows astigmatism curves of the optical imaging systems of embodiments 4, 5, and 6, which represent meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Fig. 11C shows distortion curves of the optical imaging systems of embodiments 4, 5, and 6, which represent distortion magnitude values corresponding to different image heights. As can be seen from fig. 11A to 11C, the optical imaging systems given in embodiments 4, 5 and 6 can achieve good imaging quality.
Example 7
An optical imaging system according to embodiment 7 of the present application is described below with reference to fig. 12.
As shown in fig. 12, the optical imaging systems 700 each include a lens barrel P0, and a six-piece lens group and a spacer element group disposed within the lens barrel P0, the six-piece lens group including, in order from an object side to an image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. The stop STO may be disposed between the first lens E1 and the second lens E2. The spacer element group includes: a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5. The spacing element can block excessive light rays in the imaging process from entering the next lens, and meanwhile, the lens and the lens barrel P0 are better supported, so that the structural stability of the optical imaging system is enhanced.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The filter has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
Table 5 shows the basic parameter table of the optical imaging system of example 7, in which the unit of radius of curvature, thickness/distance is millimeter (mm).
TABLE 5
In the present embodiment, the object side surface and the image side surface of any one of the first to sixth lenses E1 to E6 are aspherical surfaces. Table 6 shows the higher order coefficients A that can be used for each of the aspherical surfaces S1-S12 in example 7 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 7.5887E-03 | -1.7130E-02 | 7.4595E-03 | 3.8535E-03 | -5.3059E-03 | 2.0347E-03 | -2.7219E-04 |
| S2 | 7.8517E-02 | -1.2575E-01 | 7.7041E-01 | -2.3239E+00 | 4.0801E+00 | -3.6416E+00 | 1.3468E+00 |
| S3 | -2.4704E-02 | 2.7609E-02 | -3.7068E-01 | 1.0432E+00 | -1.7148E+00 | 1.4439E+00 | -5.2895E-01 |
| S4 | -8.0427E-02 | -1.0804E-01 | -1.9391E-01 | 1.1513E+00 | -1.6314E+00 | 9.8870E-01 | -2.2806E-01 |
| S5 | -2.9455E-01 | 7.9995E-01 | -3.0975E+00 | 6.0917E+00 | -6.3764E+00 | 3.4653E+00 | -7.7278E-01 |
| S6 | -1.9388E-01 | 1.1210E+00 | -3.1683E+00 | 4.8531E+00 | -4.1726E+00 | 1.9367E+00 | -3.7969E-01 |
| S7 | -7.7450E-02 | 9.9294E-02 | 6.1611E-02 | -6.0148E-01 | 8.8645E-01 | -4.9832E-01 | 9.9316E-02 |
| S8 | 6.1741E-02 | -7.8135E-01 | 1.2150E+00 | -8.6289E-01 | 2.7553E-01 | -1.0065E-02 | -6.4964E-03 |
| S9 | 1.6078E-01 | -6.5052E-01 | 4.5306E-01 | 5.2481E-01 | -9.0612E-01 | 4.7171E-01 | -8.7235E-02 |
| S10 | -2.9990E-02 | 4.0891E-02 | -3.0933E-01 | 5.8714E-01 | -4.4380E-01 | 1.4261E-01 | -1.4748E-02 |
| S11 | -1.7737E-01 | -1.5765E-03 | 2.1500E-01 | -2.0450E-01 | 7.6347E-02 | -6.6406E-03 | -1.2598E-03 |
| S12 | -2.9377E-01 | 2.1673E-01 | -1.2184E-01 | 4.9745E-02 | -1.5595E-02 | 3.4638E-03 | -4.0341E-04 |
TABLE 6
Example 8
An optical imaging system according to embodiment 8 of the present application is described below with reference to fig. 13.
As shown in fig. 13, the optical imaging systems 800 each include a lens barrel P0, and a six-piece lens group and a spacer element group disposed within the lens barrel P0, the six-piece lens group including, in order from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. The stop STO may be disposed between the first lens E1 and the second lens E2. The spacer element group includes: a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5.
The lens of this embodiment has the same structure as that of the lens of embodiment 7, that is, the basic parameter table of the optical imaging system of this embodiment is the same as table 5, and the aspherical coefficient table is the same as table 6. This embodiment differs from embodiment 7 in that: the lens barrel P0, the second interval element P2, the third interval element P3, the fourth interval element P4, and the fifth interval element P5 are different in structural size. For example, the number of the cells to be processed, an inner diameter D2s of the object side of the second spacer element, an inner diameter D2m of the image side of the second spacer element, an outer diameter D2s of the object side of the second spacer element, an inner diameter D2m of the image side of the second spacer element, an inner diameter D3s of the object side of the third spacer element, an inner diameter D3m of the image side of the third spacer element, an outer diameter D3s of the object side of the third spacer element, an outer diameter D3m of the image side of the third spacer element, an inner diameter D4s of the object side of the fourth spacer element, an inner diameter D4m of the image side of the fourth spacer element, an outer diameter D4m of the image side of the fourth spacer element, an inner diameter D5s of the object side of the fifth spacer element the parameters of the inner diameter D5m of the image side surface of the fifth spacing element, the outer diameter D5s of the object side surface of the fifth spacing element, the outer diameter D5m of the image side surface of the fifth spacing element, the inner diameter D0s of the object side end surface of the lens barrel, the inner diameter D0m of the image side end surface of the lens barrel, the outer diameter D0s of the object side end surface of the lens barrel, the outer diameter D0m of the image side end surface of the lens barrel, the maximum thickness CP2 of the second spacing element, the maximum thickness CP3 of the third spacing element, the spacing EP34 of the third spacing element and the fourth spacing element along the optical axis, the maximum thickness CP4 of the fourth spacing element, the spacing EP45 of the fourth spacing element and the fifth spacing element along the optical axis, the maximum thickness CP5 of the fifth spacing element, and the length L of the lens barrel in the direction in which the optical axis is located are different.
Example 9
An optical imaging system according to embodiment 9 of the present application is described below with reference to fig. 14.
As shown in fig. 14, the optical imaging systems 900 each include a lens barrel P0, and a six-piece lens group and a spacer element group disposed within the lens barrel P0, the six-piece lens group including, in order from an object side to an image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. The stop STO may be disposed between the first lens E1 and the second lens E2. The spacer element group includes: a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5.
The lens of this embodiment has the same structure as that of the lens of embodiment 7, that is, the basic parameter table of the optical imaging system of this embodiment is the same as table 5, and the aspherical coefficient table is the same as table 6. This embodiment differs from embodiment 7 in that: the lens barrel P0, the second interval element P2, the third interval element P3, the fourth interval element P4, and the fifth interval element P5 are different in structural size. For example, the number of the cells to be processed, an inner diameter D2s of the object side of the second spacer element, an inner diameter D2m of the image side of the second spacer element, an outer diameter D2s of the object side of the second spacer element, an inner diameter D2m of the image side of the second spacer element, an inner diameter D3s of the object side of the third spacer element, an inner diameter D3m of the image side of the third spacer element, an outer diameter D3s of the object side of the third spacer element, an outer diameter D3m of the image side of the third spacer element, an inner diameter D4s of the object side of the fourth spacer element, an inner diameter D4m of the image side of the fourth spacer element, an outer diameter D4m of the image side of the fourth spacer element, an inner diameter D5s of the object side of the fifth spacer element the parameters of the inner diameter D5m of the image side surface of the fifth spacing element, the outer diameter D5s of the object side surface of the fifth spacing element, the outer diameter D5m of the image side surface of the fifth spacing element, the inner diameter D0s of the object side end surface of the lens barrel, the inner diameter D0m of the image side end surface of the lens barrel, the outer diameter D0s of the object side end surface of the lens barrel, the outer diameter D0m of the image side end surface of the lens barrel, the maximum thickness CP2 of the second spacing element, the maximum thickness CP3 of the third spacing element, the spacing EP34 of the third spacing element and the fourth spacing element along the optical axis, the maximum thickness CP4 of the fourth spacing element, the spacing EP45 of the fourth spacing element and the fifth spacing element along the optical axis, the maximum thickness CP5 of the fifth spacing element, and the length L of the lens barrel in the direction in which the optical axis is located are different.
Fig. 15A shows on-axis chromatic aberration curves of the optical imaging systems of examples 7, 8, and 9, which represent the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging systems. Fig. 15B shows astigmatism curves of the optical imaging systems of embodiments 7, 8, and 9, which represent meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Fig. 15C shows distortion curves of the optical imaging systems of embodiments 7, 8, and 9, which represent distortion magnitude values corresponding to different image heights. As can be seen from fig. 15A to 15C, the optical imaging systems given in embodiments 7, 8 and 9 can achieve good imaging quality.
Table 7 shows the optical imaging system of each of embodiments 1 to 9 and the focal length value of each lens, wherein the unit of focal length is millimeters (mm).
| Focal length/embodiment | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| f | 2.08 | 2.08 | 2.08 | 2.08 | 2.08 | 2.08 | 2.08 | 2.08 | 2.08 |
| f1 | -3.21 | -3.21 | -3.21 | -3.13 | -3.13 | -3.13 | -3.09 | -3.09 | -3.09 |
| f2 | 2.50 | 2.50 | 2.50 | 2.49 | 2.49 | 2.49 | 2.52 | 2.52 | 2.52 |
| f3 | -3.18 | -3.18 | -3.18 | 8.75 | 8.75 | 8.75 | -3.45 | -3.45 | -3.45 |
| f4 | 2.55 | 2.55 | 2.55 | -3.74 | -3.74 | -3.74 | 2.24 | 2.24 | 2.24 |
| f5 | 2.40 | 2.40 | 2.40 | 1.54 | 1.54 | 1.54 | 3.14 | 3.14 | 3.14 |
| f6 | -1.84 | -1.84 | -1.84 | -1.62 | -1.62 | -1.62 | -1.87 | -1.87 | -1.87 |
| f34 | 14.05 | 14.05 | 14.05 | -6.80 | -6.80 | -6.80 | 6.09 | 6.09 | 6.09 |
| f56 | 29.24 | 29.24 | 29.24 | 2.76 | 2.76 | 2.76 | -9.57 | -9.57 | -9.57 |
TABLE 7
Table 8 shows some basic parameters of the lens barrel and the spacer element of each of embodiments 1 to 9, such as D2s, D2m, D3s, D3m, D4s, D4m, D5s, D5m, D0s, D0m, CP2, CP3, EP34, CP4, EP45, CP5, L, etc., and some basic parameters listed in table 8 were measured according to the labeling method shown in fig. 1, and the basic parameters listed in table 8 were all in millimeters (mm).
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TABLE 8
Table 9 shows the values of the conditional expressions of each of examples 1 to 9.
| Condition/example | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| |f3|/f2 | 1.27 | 1.27 | 1.27 | 3.51 | 3.51 | 3.51 | 1.37 | 1.37 | 1.37 |
| (R4/R3)×(D2s/d2s) | -2.14 | -2.78 | -2.83 | -2.40 | -2.27 | -2.27 | -2.47 | -2.36 | -2.21 |
| (R12/CT6)×(D0m/d0m) | 13.65 | 13.71 | 13.71 | 9.49 | 9.35 | 9.53 | 12.80 | 12.89 | 12.84 |
| (f2/R4)×(D2m/CP2) | -6.20 | -7.95 | -7.93 | -8.00 | -7.56 | -7.56 | -8.40 | -7.79 | -7.54 |
| (d2m×D2m)/|f2×f3| | 0.90 | 1.16 | 1.14 | 0.37 | 0.35 | 0.35 | 1.01 | 0.94 | 0.91 |
| (d0s×D0s)/(R1×R2) | 2.16 | 1.59 | 1.59 | 0.84 | 0.92 | 0.84 | 0.66 | 0.65 | 0.68 |
| L/(T12+T45+T56) | 2.76 | 2.65 | 2.65 | 3.51 | 3.51 | 3.51 | 2.90 | 2.90 | 2.90 |
| (d3s×D3s)/(f3×f4) | -0.95 | -1.20 | -1.20 | -0.28 | -0.27 | -0.27 | -1.26 | -1.14 | -1.20 |
| (R6/R7)×(D3m/d3m) | 1.60 | 2.01 | 2.01 | 1.43 | 1.36 | 1.36 | 1.85 | 1.67 | 1.76 |
| |f4/R8|×(D4m/d4m) | 0.24 | 0.30 | 0.30 | 1.73 | 1.65 | 1.65 | 0.39 | 0.35 | 0.29 |
| D4s/(f+f5) | 0.75 | 0.95 | 0.95 | 1.02 | 0.97 | 0.97 | 0.82 | 0.75 | 0.61 |
| (D5s+D5m-d5s-d5m)/(f5-f6) | 0.39 | 0.47 | 0.94 | 0.88 | 0.75 | 0.77 | 0.73 | 0.57 | 0.65 |
| (T34+CT4)/(CP3+EP34) | 2.41 | 2.41 | 2.41 | 1.13 | 1.13 | 1.13 | 1.97 | 1.97 | 2.45 |
| (CP4+EP45+CP5)/|f4+f5+f6| | 0.27 | 0.24 | 0.24 | 0.25 | 0.25 | 0.20 | 0.11 | 0.11 | 0.14 |
| |f56/f34|×(d5s/d4s) | 2.45 | 2.39 | 2.39 | 0.47 | 0.47 | 0.45 | 1.68 | 1.68 | 1.70 |
| f/(CP2+CP3+CP4+CP5) | 2.12 | 2.80 | 2.80 | 2.67 | 2.67 | 2.67 | 5.17 | 5.17 | 5.17 |
TABLE 9
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the utility model referred to in this application is not limited to the specific combinations of features described above, but also covers other technical solutions which may be formed by any combination of the features described above or their equivalents without departing from the inventive concept. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.
Claims (15)
1. An optical imaging system, comprising:
a six-piece lens group including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in order from an object side to an image side along an optical axis, wherein the first lens and the sixth lens have negative optical power, the second lens and the fifth lens have positive optical power, and positive and negative properties of the optical power of the third lens and the fourth lens are opposite;
A spacer element group including a second spacer element disposed on and in contact with an image side surface of the second lens; and
a lens barrel in which the six-piece lens group and the spacing element group are disposed;
wherein, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: 1.2< |f3|/f2<3.6,
the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, the inner diameter D2s of the object-side surface of the second spacer element and the outer diameter D2s of the object-side surface of the second spacer element satisfy: -3< (R4/R3) × (D2 s/D2 s) < -2.
2. The optical imaging system according to claim 1, wherein a curvature radius R12 of an image side surface of the sixth lens, a center thickness CT6 of the sixth lens on the optical axis, an inner diameter D0m of an image side end surface of the lens barrel, and an outer diameter D0m of the image side end surface of the lens barrel satisfy: 9.3< (R12/CT 6) × (D0 m/D0 m) <13.8.
3. The optical imaging system of claim 1, wherein an effective focal length f2 of the second lens, a radius of curvature R4 of an image side of the second lens, an outer diameter D2m of an image side of the second spacer element, and a maximum thickness CP2 of the second spacer element satisfy: -8.5< - (f 2/R4) × (D2 m/CP 2) < -6.1.
4. The optical imaging system of claim 1, wherein an effective focal length f2 of the second lens, an effective focal length f3 of the third lens, an inner diameter D2m of an image side of the second spacing element, and an outer diameter D2m of the image side of the second spacing element satisfy: (d2m×d2m)/|f2×f3| <1.2.
5. The optical imaging system according to claim 1, wherein a radius of curvature R1 of the object side surface of the first lens, a radius of curvature R2 of the image side surface of the first lens, an inner diameter D0s of the object side end surface of the lens barrel, and an outer diameter D0s of the object side end surface of the lens barrel satisfy: 0< (d0sxd0s)/(r1×r2) <2.2.
6. The optical imaging system according to claim 1, wherein a length L of the lens barrel in a direction in which the optical axis is located, an air interval T12 of the first lens and the second lens on the optical axis, an air interval T45 of the fourth lens and the fifth lens on the optical axis, and an air interval T56 of the fifth lens and the sixth lens on the optical axis satisfy: 2.6< L/(T12+T45+T56) <3.6.
7. The optical imaging system of any of claims 1 to 6, wherein the set of spacer elements further comprises a third spacer element disposed on and in contact with the image side of the third lens,
Wherein an effective focal length f3 of the third lens, an effective focal length f4 of the fourth lens, an inner diameter D3s of the object side surface of the third spacing element, and an outer diameter D3s of the object side surface of the third spacing element satisfy: -1.3< (d3sxd3s)/(f3xf4) <0.
8. The optical imaging system of any of claims 1 to 6, wherein the set of spacer elements further comprises a third spacer element disposed on and in contact with the image side of the third lens,
wherein a radius of curvature R6 of the image side surface of the third lens, a radius of curvature R7 of the object side surface of the fourth lens, an inner diameter D3m of the image side surface of the third spacer element, and an outer diameter D3m of the image side surface of the third spacer element satisfy: 1.3< (R6/R7) × (D3 m/D3 m) <2.1.
9. The optical imaging system of any of claims 1 to 6, wherein the set of spacer elements further comprises a fourth spacer element disposed on and in contact with the image side of the fourth lens,
wherein an effective focal length f4 of the fourth lens, a curvature radius R8 of an image side surface of the fourth lens, an inner diameter D4m of the image side surface of the fourth spacing element, and an outer diameter D4m of the image side surface of the fourth spacing element satisfy: 0.2< |f4/R8|× (D4 m/D4 m) <1.8.
10. The optical imaging system of any of claims 1 to 6, wherein the set of spacer elements further comprises a fourth spacer element disposed on and in contact with the image side of the fourth lens,
wherein the total effective focal length f of the optical imaging system, the effective focal length f5 of the fifth lens and the outer diameter D4s of the object side surface of the fourth spacing element satisfy: 0.5< d4 s/(f+f5) <1.1.
11. The optical imaging system of any of claims 1 to 6, wherein the set of spacer elements further comprises a fifth spacer element disposed on and in contact with the image side of the fifth lens,
the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the inner diameter D5s of the object side surface of the fifth spacing element, the outer diameter D5s of the object side surface of the fifth spacing element, the inner diameter D5m of the image side surface of the fifth spacing element and the outer diameter D5m of the image side surface of the fifth spacing element satisfy the following conditions: 0< (D5s+D5m-D5 s-D5 m)/(f 5-f 6) <1.
12. The optical imaging system of any of claims 1 to 6, wherein the set of spacer elements further comprises a third spacer element disposed on and in contact with the image side of the third lens and a fourth spacer element disposed on and in contact with the image side of the fourth lens,
Wherein an air interval T34 of the third lens and the fourth lens on the optical axis, a center thickness CT4 of the fourth lens on the optical axis, a maximum thickness CP3 of the third interval element, and an interval EP34 of the third interval element and the fourth interval element along the optical axis satisfy: 1.1< (T34+CT4)/(CP3+EP 34) <2.5.
13. The optical imaging system of any of claims 1 to 6, wherein the set of spacer elements further comprises a fourth spacer element disposed on and in contact with the image side of the fourth lens and a fifth spacer element disposed on and in contact with the image side of the fifth lens,
wherein an effective focal length f4 of the fourth lens, an effective focal length f5 of the fifth lens, an effective focal length f6 of the sixth lens, a maximum thickness CP4 of the fourth spacing element, a maximum thickness CP5 of the fifth spacing element, and a spacing EP45 of the fourth spacing element and the fifth spacing element along the optical axis satisfy: (CP 4+ EP45+ CP 5)/|f4 + f5+ f6| <0.3.
14. The optical imaging system of any of claims 1 to 6, wherein the set of spacer elements further comprises a fourth spacer element disposed on and in contact with the image side of the fourth lens and a fifth spacer element disposed on and in contact with the image side of the fifth lens,
Wherein a combined focal length f34 of the third lens and the fourth lens, a combined focal length f56 of the fifth lens and the sixth lens, an inner diameter d4s of an object side surface of the fourth spacing element, and an inner diameter d5s of the object side surface of the fifth spacing element satisfy: 0.4< |f56/f34|× (d 5s/d4 s) <2.5.
15. The optical imaging system of any of claims 1 to 6, wherein the set of spacer elements further comprises a third spacer element disposed on and in contact with the image side of the third lens, a fourth spacer element disposed on and in contact with the image side of the fourth lens, and a fifth spacer element disposed on and in contact with the image side of the fifth lens,
wherein the total effective focal length f of the optical imaging system, the maximum thickness CP2 of the second spacer element, the maximum thickness CP3 of the third spacer element, the maximum thickness CP4 of the fourth spacer element and the maximum thickness CP5 of the fifth spacer element satisfy: 2.1< f/(CP 2+ CP3+ CP4+ CP 5) <5.2.
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