CN218886284U - Imaging system - Google Patents
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- CN218886284U CN218886284U CN202222443343.8U CN202222443343U CN218886284U CN 218886284 U CN218886284 U CN 218886284U CN 202222443343 U CN202222443343 U CN 202222443343U CN 218886284 U CN218886284 U CN 218886284U
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Abstract
The application discloses imaging system includes: the 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, wherein the first lens has negative focal power, at least one of the first lens and the second lens is a meniscus lens, and the image side surface of the sixth lens is provided with at least one inflection point; a plurality of spacer elements including a first spacer element positioned between the first lens and the second lens and in contact with an image side surface of the first lens; a lens barrel accommodating the lens group and the plurality of spacing elements; and the imaging system satisfies: 102< | f1 × T12 |/(EP 01 × CP 1) <159, wherein f1 is an effective focal length of the first lens, T12 is an air space between the first lens and the second lens on the optical axis, EP01 is a space between a front end surface of the lens barrel and an object-side surface of the first spacer element on the optical axis, and CP1 is a maximum thickness of the first spacer element.
Description
Technical Field
The present application relates to the field of optical elements, and in particular, to an imaging system.
Background
Currently, the global mobile phone lens market is developing towards multi-functions and diversification, and various mobile phone manufacturers combine lenses such as telephoto, wide angle, periscope and the like which are specialized in a certain function to be used, and use the combined lenses as selling points to attract users. Lens manufacturers actively focus on development and research of various lenses in order to improve product competitiveness and aim to optimize lens performance and production efficiency.
Nowadays, with the popularization of wide-angle lens application and the increasing demand of user market, mobile phone manufacturers no longer restrict the wide-angle lens to be used only in flagships or high-end models, but popularize the wide-angle lens in full-price models. Such lenses include a plurality of lenses and a spacer element for bearing against adjacent lenses, the presence of which increases the requirements on the processing accuracy of the lens edge thickness and the barrel front face thickness for lenses having six or even more lenses. Meanwhile, the section difference between the lenses can increase the molding difficulty of the lens, and even influence the imaging quality and the product yield of the lens.
Therefore, how to develop a lens with smaller size, easier processing and lower cost on the basis of ensuring the performance and optimizing the use feeling of the lens is a problem to be solved currently.
SUMMERY OF THE UTILITY MODEL
One aspect of the present application provides an imaging system comprising: a 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 has a negative focal power, at least one of the first lens and the second lens is a meniscus lens, and an image side surface of the sixth lens has at least one inflection point; a plurality of spacer elements including a first spacer element positioned between the first lens and the second lens and in contact with an image side surface of the first lens; a lens barrel accommodating the lens group and the plurality of spacing elements; and the imaging system satisfies: 102< | f1 × T12 |/(EP 01 × CP 1) <159, wherein f1 is an effective focal length of the first lens, T12 is an air space between the first lens and the second lens on the optical axis, EP01 is a space between a front end surface of the lens barrel and an object-side surface of the first spacer element on the optical axis, and CP1 is a maximum thickness of the first spacer element.
In one embodiment, the imaging system satisfies: 0.5 < | f2 |/(D1 s + D1 s) < 13.5, wherein f2 is the effective focal length of the second lens, D1s is the outer diameter of the object-side surface of the first spacer element, and D1s is the inner diameter of the object-side surface of the first spacer element.
In one embodiment, the plurality of spacer elements further comprises: a second spacer element positioned between the second lens and the third lens and in contact with an image side surface of the second lens, and the imaging system satisfies: 36 < (f 23/T23) > (D2 m/D2 m) < 54, wherein f23 is a composite focal length of the second lens and the third lens, T23 is an air space between the second lens and the third lens on the optical axis, D2m is an outer diameter of an image-side surface of the second spacer element, and D2m is an inner diameter of the image-side surface of the second spacer element.
In one embodiment, the plurality of spacer elements further comprises: a third spacer element positioned between the third lens and the fourth lens and in contact with an image side surface of the third lens; a fourth spacer element positioned between the fourth lens element and the fifth lens element and in contact with an image side surface of the fourth lens element; a fifth spacer element positioned between the fifth lens element and the sixth lens element and in contact with an image side surface of the fifth lens element; and the imaging system satisfies: d3s < d4s < d5s, wherein d3s is the inner diameter of the object-side surface of the third spacer element, d4s is the inner diameter of the object-side surface of the fourth spacer element, and d5s is the inner diameter of the object-side surface of the fifth spacer element.
In one embodiment, the plurality of spacer elements further comprises: a second spacer element positioned between the second lens and the third lens and in contact with an image side surface of the second lens, and the imaging system satisfies: d2m < D3m < D4m, wherein D2m is the outer diameter of the image side surface of the second spacer element, D3m is the outer diameter of the image side surface of the third spacer element, and D4m is the outer diameter of the image side surface of the fourth spacer element.
In one embodiment, a maximum thickness of each of the plurality of spacer elements between the first lens and the sixth lens is less than 0.1 mm.
In one embodiment, the third lens has positive optical power, and the object-side surface of the third lens is a convex surface and the image-side surface of the third lens is a convex surface.
In one embodiment, the fifth lens and the sixth lens have different positive and negative power properties, and both the fifth lens and the sixth lens are meniscus lenses.
In one embodiment, the plurality of spacer elements further comprises: a second spacer element positioned between the second lens and the third lens and in contact with an image side surface of the second lens, and the imaging system satisfies: 3 < | f3+ f4 |/(EP 23+ CP 3) < 13, wherein f3 is an effective focal length of the third lens, f4 is an effective focal length of the fourth lens, EP23 is a separation on the optical axis of an image-side surface of the second spacer element and an object-side surface of the third spacer element, and CP3 is a maximum thickness of the third spacer element.
In one embodiment, the imaging system satisfies: 1 < | R6 |/(D3 s |, D3 s) < 14, wherein R6 is the radius of curvature of the image-side surface of the third lens, R7 is the radius of curvature of the object-side surface of the fourth lens, D3s is the inner diameter of the object-side surface of the third spacing element, and D3s is the outer diameter of the object-side surface of the third spacing element.
In one embodiment, the imaging system satisfies: 15 < (d 3m d4 m)/(CT 4 EP 34) < 30, wherein d3m is an inner diameter of an image-side surface of the third spacer element, d4m is an inner diameter of an image-side surface of the fourth spacer element, CT4 is a center thickness of the fourth lens on the optical axis, and EP34 is a spacing between the image-side surface of the third spacer element and an object-side surface of the fourth spacer element on the optical axis.
In one embodiment, the imaging system satisfies: 1 < (D4 s + D4 s)/f 45 < 7, wherein D4s is the outer diameter of the object-side surface of the fourth spacer element, D4s is the inner diameter of the object-side surface of the fourth spacer element, and f45 is the composite focal length of the fourth lens element and the fifth lens element.
In one embodiment, the imaging system satisfies: 6 < (D5 s + D5 s)/(CT 5+ T56) < 11, wherein D5s is an inner diameter of an object-side surface of the fifth spacing element, D5s is an outer diameter of the object-side surface of the fifth spacing element, CT5 is a center thickness of the fifth lens on the optical axis, and T56 is an air space between the fifth lens and the sixth lens on the optical axis.
In one embodiment, the plurality of spacer elements further comprises: a sixth spacing element in contact with an image side surface of the sixth lens, and the imaging system satisfies: if 6/f 5 > 1; v6 is less than 50; EP56/CP6 > 1, wherein f6 is the effective focal length of the sixth lens, f5 is the effective focal length of the fifth lens, V6 is the Abbe number of the sixth lens, EP56 is the interval between the image side surface of the fifth spacing element and the object side surface of the sixth spacing element along the optical axis, and CP6 is the maximum thickness of the sixth spacing element.
In one embodiment, the imaging system satisfies: 2< (D0 s x D0 s)/(f x TD) < 6, wherein D0s is an inner diameter of the lens barrel front end face, D0s is an outer diameter of the lens barrel front end face, f is an effective focal length of the imaging system, and TD is an interval between an object side face of the first lens and an image side face of the sixth lens on the optical axis.
In one embodiment, the imaging system satisfies: 0.2 < (f 1 f 6)/(d 1m d6 m) < 3.2, wherein f1 is an effective focal length of the first lens, f6 is an effective focal length of the sixth lens, d1m is an inner diameter of an image-side surface of the first spacing element, and d6m is an inner diameter of an image-side surface of the sixth spacing element.
The imaging system adopts a six-piece type imaging system framework, and the space positions and the mutual distances of the lens and the spacing element, particularly the air interval on the optical axis, are reasonably arranged, so that the miniaturization of the imaging system is facilitated, the optical performance of the imaging system can be ensured, and particularly the allowance of defocusing performance is controlled; by controlling the interval between the front end surface of the lens cone and the side surface of the first spacing element object along the optical axis, the thickness of the first lens edge and the thickness of the front end of the lens cone can be effectively controlled, and the forming difficulty is reduced; the incident range of the light can be reasonably controlled by restricting the focal length of the first lens and the air interval between the first lens and the second lens; the field curvature can be effectively improved by adjusting the thickness of the first spacing element, so that the optical system has good optical performance, and the yield is effectively improved.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 shows a parametric annotation schematic for an imaging system according to any one of embodiments 1 to 3 of the present application;
fig. 2 shows a schematic configuration diagram of an imaging system according to embodiment 1 of the present application;
fig. 3 shows a schematic configuration diagram of another imaging system according to embodiment 1 of the present application;
fig. 4 shows a schematic configuration diagram of still another imaging system according to embodiment 1 of the present application;
fig. 5A to 5C show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging system of embodiment 1, respectively;
fig. 6 is a schematic configuration diagram showing an imaging system according to embodiment 2 of the present application;
fig. 7 shows a schematic configuration diagram of another imaging system according to embodiment 2 of the present application;
fig. 8 is a schematic configuration diagram showing still another imaging system according to embodiment 2 of the present application;
fig. 9A to 9C show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve of the imaging system of embodiment 2, respectively;
fig. 10 is a schematic structural view showing an imaging system according to embodiment 3 of the present application;
fig. 11 is a schematic configuration diagram showing another imaging system according to embodiment 3 of the present application;
fig. 12 is a schematic configuration diagram showing still another imaging system according to embodiment 3 of the present application; and
fig. 13A to 13C show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the imaging system of embodiment 3.
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 the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and 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, it means that 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 called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.
It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" 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. Moreover, when a statement such as "at least one of" appears after the list of listed features, that the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "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 the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The following examples merely represent several embodiments of the present application, which are described in more detail and detail, but are not to be construed as limiting the scope of the claimed technical solution. It should be noted that, for a person skilled in the art, it is possible to make several variations and improvements without departing from the concept of the present application, which all fall within the protection scope of the present application, for example, any combination between the lens group, the lens barrel and the spacing element may be used in the embodiments of the present application, and the lens group in one embodiment is not limited to be combined with the lens barrel and the spacing element of the embodiment. Features, principles and other aspects of the present application will be described in detail below with reference to the drawings and in conjunction with embodiments.
An imaging system according to an exemplary embodiment of the present application may include six lenses having optical power, a plurality of spacer elements, and a lens barrel for accommodating the lenses and the plurality of spacer elements. The six lenses with optical power comprise a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are arranged in sequence from an object side to an image side along an optical axis. The plurality of spacer elements includes at least a first spacer element positioned between the first lens and the second lens and in contact with the image side surface of the first lens.
In an exemplary embodiment, the first lens may have a negative power, at least one of the first lens and the second lens is a meniscus lens, and the image side surface of the sixth lens has at least one inflection point.
In an exemplary embodiment, an imaging system according to the present application may satisfy: 102< | f1 × T12 |/(EP 01 × CP 1) <159, where f1 is an effective focal length of the first lens, T12 is an air space on an optical axis between the first lens and the second lens, EP01 is an interval on the optical axis between a front end surface of the lens barrel and an object side surface of the first spacer element, and CP1 is a maximum thickness of the first spacer element. By controlling the interval EP01 between the front end surface of the lens cone and the side surface of the first spacing element object along the optical axis, the edge thickness of the first lens and the thickness of the front end of the lens cone can be effectively controlled, and the forming difficulty is reduced; the incident range of light can be reasonably controlled by restricting the focal length f1 of the first lens and the air interval T12 between the first lens and the second lens; the field curvature can be effectively improved by adjusting the thickness CP1 of the first spacing element; by comprehensively regulating and controlling the absolute value of the product of f1 and T12 and the ratio of the product of EP01 and CP1, the optical system has good optical performance, thereby effectively improving the yield.
In an exemplary embodiment, an imaging system according to the present application may satisfy: 0.5 < | f2 |/(D1 s + D1 s) < 13.5, f2 being the effective focal length of the second lens, D1s being the outer diameter of the object-side surface of the first spacer element, D1s being the inner diameter of the object-side surface of the first spacer element. By controlling the inner and outer diameters of the first spacer element, the optical stability of the imaging system can be effectively improved.
In an exemplary embodiment, the plurality of spacer elements of the imaging system according to the present application further includes a second spacer element positioned between the second lens and the third lens and in contact with the image side surface of the second lens. The imaging system according to the present application may satisfy: 36 < (f 23/T23) > (D2 m/D2 m) < 54, f23 is the composite focal length of the second lens and the third lens, T23 is the air space between the second lens and the third lens on the optical axis, D2m is the outer diameter of the image side surface of the second spacing element, and D2m is the inner diameter of the image side surface of the second spacing element. The imaging system can be a wide-angle lens, the second spacing element is generally a diaphragm, the optical performance can be effectively controlled by controlling the dimensions D2m and D2m of the inner and outer diameters of the image side surface, and meanwhile, the air space T23 between the second lens and the third lens on the optical axis is one of the most sensitive dimensions of the imaging system and needs to be strictly controlled to prevent performance variation.
In an exemplary embodiment, the plurality of spacer elements of the imaging system according to the present application further includes a third spacer element positioned between the third lens and the fourth lens and in contact with the image-side surface of the third lens, a fourth spacer element positioned between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens; and a fifth spacing element positioned between the fifth lens element and the sixth lens element and in contact with the image side surface of the fifth lens element. The imaging system according to the present application satisfies: d3s < d4s < d5s, d3s being the inner diameter of the object-side face of the third spacer element, d4s being the inner diameter of the object-side face of the fourth spacer element and d5s being the inner diameter of the object-side face of the fifth spacer element. The imaging system is a wide-angle lens, the field angle of the imaging system is larger than that of other lenses, the second spacing element is a diaphragm, and the inner diameters of the third spacing element, the fourth spacing element and the fifth spacing element are sequentially and obviously increased, so that the non-effective diameter part of the lens can be shielded to the maximum extent under the condition of not shielding the edge light path of the optical system, and the effect of preventing stray light is achieved.
In an exemplary embodiment, the plurality of spacer elements of the imaging system according to the present application further comprises a second spacer element located between the second lens and the third lens and in contact with the image side surface of the second lens. The imaging system according to the present application satisfies: d2m < D3m < D4m, D2m being the outer diameter of the image-side face of the second spacer element, D3m being the outer diameter of the image-side face of the third spacer element, D4m being the outer diameter of the image-side face of the fourth spacer element. The imaging system adopts a structure that the lenses are externally supported and stacked, the function is to optimize the performance reliability, and because of the general stability and optical performance requirements of the lens, the object side surface is generally smaller than the image side surface, and for the uniformity of the lens cone wall, the outer diameters of the third, fourth and fifth spacing pieces need to be matched with the inner diameter of the lens cone in sequence to be increased.
In an exemplary embodiment, a maximum thickness of each of the plurality of spacer elements between the first lens to the sixth lens of the imaging system according to the present application is less than 0.1 mm. All the spacers in the imaging system are used as bearing parts and are thin-specification spacing elements, the air interval of the lens on the optical axis is controlled through the material thickness, the performance quality and the yield can be stabilized, the material hardness of the spacing elements within the thickness of 0.1mm is high, and the imaging system is suitable for being used as the bearing parts.
In an exemplary embodiment, the third lens in the imaging system according to the present application has a positive optical power, with a convex object-side surface and a convex image-side surface. The optical system can be a wide-angle lens, the characteristics of the diaphragm are determined by the wide-angle lens, the air interval where the diaphragm is located is the interval between the second lens and the third lens on the optical axis, and the interval has the largest influence on the performance of the lens, so that the object side surface and the image side surface of the third lens are both convex surfaces, the deformation of the lens is stabilized to the maximum extent while the optical system is satisfied, and the size of the air interval is controlled.
In an exemplary embodiment, the optical powers of the fifth lens and the sixth lens of the imaging system according to the present application are opposite in positive and negative, and both the fifth lens and the sixth lens are meniscus lenses. Through the setting of the fifth lens and the sixth lens, the intensity of lens stray light and ghost can be reduced to a certain degree, and the user experience is improved.
In an exemplary embodiment, the plurality of spacer elements of the imaging system according to the present application further comprises a second spacer element located between the second lens and the third lens and in contact with an image side surface of the second lens. And the imaging system according to the application satisfies: 3 < | f3+ f4 |/(EP 23+ CP 3) < 13, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, EP23 is the separation on the optical axis of the image-side face of the second spacer element and the object-side face of the third spacer element, and CP3 is the maximum thickness of the third spacer element. Because of the requirement of performance stability, the fitting size of the lens, especially the sensitive lens, and other parts needs to be stable, so that the spacing size between adjacent spacing elements is directly controlled, the fitting size among the spacing element, the lens and the lens can be effectively stabilized, and the performance of the product is kept stable in mass production.
In an exemplary embodiment, an imaging system according to the present application satisfies: 1 < | R6R 7 |/(D3 s D3 s) < 14, R6 is the radius of curvature of the image-side surface of the third lens, R7 is the radius of curvature of the object-side surface of the fourth lens, D3s is the inner diameter of the object-side surface of the third spacer element, and D3s is the outer diameter of the object-side surface of the third spacer element. By controlling the inner and outer diameters D3s and D3s of the third spacer element, the impact on the overall performance of the lens during assembly can be minimized. The main control point is that after the assembly, the spacing element should not touch the effective optical system, thereby avoiding the performance loss of unconventional performance and finally ensuring the quality and yield of the product to reach the standard.
In an exemplary embodiment, an imaging system according to the present application satisfies: 15 < (d 3m d4 m)/(CT 4 EP 34) < 30, d3m is the inner diameter of the image side surface of the third spacing element, d4m is the inner diameter of the image side surface of the fourth spacing element, CT4 is the central thickness of the fourth lens on the optical axis, EP34 is the interval between the image side surface of the third spacing element and the object side surface of the fourth spacing element along the optical axis, the central thickness CT4 of the fourth lens on the optical axis is controlled within a certain range in actual production, the field curvature performance of the imaging system can be corrected, the sensitivity of the central thickness is lower than the central thicknesses of the third and second lenses, so the adjustable amplitude is larger, the effect is better, and the thickness in the fourth lens can be finely adjusted within the control range in the production process to improve the quality and the yield.
In an exemplary embodiment, an imaging system according to the present application satisfies: 1 < (D4 s + D4 s)/f 45 < 7, D4s is the outer diameter of the object-side surface of the fourth spacing element, D4s is the inner diameter of the object-side surface of the fourth spacing element, and f45 is the composite focal length of the fourth lens and the fifth lens. Like the third spacer, the fourth spacer does not touch the effective optical system after being assembled, so that the negative influence on the lens is minimized, and the product quality and yield are ensured.
In an exemplary embodiment, an imaging system according to the present application satisfies: 6 < (D5 s + D5 s)/(CT 5+ T56) < 11, D5s is the inner diameter of the object-side surface of the fifth spacing element, D5s is the outer diameter of the object-side surface of the fifth spacing element, CT5 is the center thickness of the fifth lens on the optical axis, and T56 is the air space between the fifth lens and the sixth lens on the optical axis. In actual production, the central thickness CT5 of the fifth lens on the optical axis is controlled within a certain range, so that the field curvature performance of the imaging system can be corrected, and the central thickness of the fifth lens also has the advantages of relatively low sensitivity and large adjustable range, so that the field curvature performance can be finely adjusted, and the product yield is increased.
In an exemplary embodiment, the plurality of spacer elements of the imaging system according to the present application further comprises a sixth spacer element in contact with the image side surface of the sixth lens. When the focal length | f6|/| f5| > 1 and the abbe number V6 of the sixth lens is less than 50, the imaging system satisfies: EP56/CP6 > 1. f6 is the effective focal length of the sixth lens, f5 is the effective focal length of the fifth lens, V6 is the abbe number of the sixth lens, EP56 is the distance between the image-side surface of the fifth spacing element and the object-side surface of the sixth spacing element along the optical axis, and CP6 is the maximum thickness of the sixth spacing element. The imaging system is a wide-angle lens, the sixth lens is sensitive close to the image side due to the particularity of the wide-angle lens, a high-refractive-index material is used, deformation and inclination of the sixth lens are more difficult to control relative to the previous lens in a lens assembling state, and when f6 and EP56 meet conditions, the performance of the image side and the performance of the object side of the sixth lens can be complemented to a certain extent, so that negative effects of assembling deviation on the lens are reduced, and the quality yield is guaranteed.
In an exemplary embodiment, an imaging system according to the present application satisfies: 2< (D0 s D0 s)/(f TD) < 6, D0s is the inner diameter of the front end face of the lens barrel, D0s is the outer diameter of the front end face of the lens barrel, f is the effective focal length of the optical imaging lens, and TD is the on-axis distance from the object side face of the first lens to the image side face of the sixth lens. Generally, the effective focal length of a mobile phone lens is controlled by the clear aperture of a lens barrel and the total length of a full lens on an optical axis, and the main parameters of the lens are ensured not to be out of tolerance by controlling the parameters in actual manufacturing.
In an exemplary embodiment, an imaging system according to the present application satisfies: 0.2 < (f 1 x f 6)/(d 1m x d6 m) < 3.2, f1 is the effective focal length of the first lens, f6 is the effective focal length of the sixth lens, d1m is the inner diameter of the image-side face of the first spacing element, and d6m is the inner diameter of the image-side face of the sixth spacing element. The imaging system can be a large wide-angle lens, the effective field angle of the imaging system is enlarged by adopting a mode of a middle diaphragm, the inner diameter sizes of the first and the last two lenses are required to be controlled most, and the main parameters related to the field angle are prevented from being out of tolerance.
In an exemplary embodiment, the on-axis distance TD of the first lens object-side surface to the sixth lens image-side surface may be, for example, in the range of 3.5mm to 4.5mm, and the half ImgH of the diagonal length of the effective pixel area on the imaging plane of the imaging system may be, for example, in the range of 3.0mm to 3.5 mm.
Optionally, the above-described imaging system may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element located on the imaging surface.
The application provides an imaging system scheme, which can realize the miniaturization, the easy processing and the good optical performance effect of the imaging system. The imaging system according to the above-mentioned embodiment of the present application may employ a plurality of lenses, for example, six lenses as described above, and by reasonably setting the spatial positions and mutual distances of the lenses and the spacers, especially the air space thereof on the optical axis, the miniaturization of the imaging system is facilitated, and the optical performance of the imaging system can be ensured, especially the margin of controlling the defocus performance; by controlling the interval between the front end surface of the lens cone and the side surface of the first spacing element object along the optical axis, the thickness of the first lens edge and the thickness of the front end of the lens cone can be effectively controlled, and the forming difficulty is reduced; the incident range of the light can be reasonably controlled by restricting the focal length of the first lens and the air interval between the first lens and the second lens; the field curvature can be effectively improved by adjusting the thickness of the first spacing element, so that the optical system has good optical performance, and the yield is effectively improved.
In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object-side surface of the first lens to the image-side surface of the sixth lens is an aspherical mirror surface. The aspheric 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 better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, and the imaging quality is improved. Optionally, at least one of an object-side surface and an image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens is an aspheric mirror surface. Optionally, each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens has an object-side surface and an image-side surface which are aspheric mirror surfaces.
However, it will be appreciated by those skilled in the art that the number of lenses making up the imaging system can be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter. For example, although six lenses are exemplified in the embodiment, the imaging system is not limited to including six lenses. The imaging system may also include other numbers of lenses, if desired.
Specific examples of imaging systems that can be adapted to the above-described embodiments are further described below with reference to the accompanying drawings. Fig. 1 is a schematic parameter labeling diagram of an imaging system according to an embodiment of the present application, and reference may be made to fig. 1 for structural parameters of each part of any imaging system provided in embodiments 1 to 3 of the present application.
Example 1
An imaging system according to embodiment 1 of the present application is described below with reference to fig. 2 to 5C. Fig. 2 to 4 respectively show structural schematic diagrams of the imaging system 110, the imaging system 120, and the imaging system 130 according to embodiment 1 of the present application.
As shown in fig. 2 to 4, the imaging system 110, the imaging system 120, and the imaging system 130 each include a lens group E1 to E6, a plurality of spacing elements P1 to P6, and a lens barrel, respectively.
The imaging system 110, the imaging system 120, and the imaging system 130 may employ the same lens group, which in order from an object side to an image side comprises: 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 first lens element E1 has a negative refractive power, and has a concave object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive refractive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has a negative refractive power, and has a concave object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive refractive power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12.
Optionally, the imaging systems 110, 120, and 130 may also each include filters and an imaging plane (not shown). The filter has an object side surface S13 (not shown) and an image side surface S14 (not shown). The light from the object passes through the first lens E1 to the filter in order and is finally imaged on the imaging plane S15 (not shown).
Table 1 shows a basic parameter table of the imaging systems 110, 120, and 130 of embodiment 1, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).
TABLE 1
In this example, the total effective focal lengths f of the imaging systems 110, 120, and 130 are each 1.83mm, and the on-axis distances TD from the object-side surface of the first lens to the image-side surface of the sixth lens of the imaging systems 110, 120, and 130 are each 4.05mm. The imaging system has an ImgH of 3.19mm for half of the diagonal length of the effective pixel area on the imaging plane.
In embodiment 1, 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 is not limited to, the following aspheric formula:
wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of 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 i-th order of the aspheric surface. The high-order coefficient A for each of the aspherical mirror surfaces S1 to S12 used in example 1 is shown in tables 2-1 and 2-2 below 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 And A 30 。
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 7.1871E-01 | -1.2798E+00 | 2.2687E+00 | -3.5060E+00 | 4.4569E+00 | -4.4994E+00 | 3.5241E+00 |
| S2 | 8.1127E-01 | -1.6835E+00 | 6.3881E+00 | -2.7389E+01 | 9.2167E+01 | -2.2352E+02 | 3.8911E+02 |
| S3 | -1.1225E-＜2 | 2.6979E-01 | -5.3729E+00 | 3.5173E+01 | -1.4642E+02 | 4.0715E+02 | -7.6258E+＜2 |
| S4 | -4.8140E-02 | 4.1098E+00 | -1.0040E+02 | 1.4496E+03 | -1.3962E+04 | 9.4069E+04 | -4.5455E+05 |
| S5 | -4.4957E-03 | 4.4733E-01 | -7.1367E+00 | 6.5157E+01 | -3.9001E+02 | 1.4661E+03 | -3.3583E+03 |
| S6 | -1.4095E-01 | -1.2412E+00 | 2.7622E+01 | -3.4952E+02 | 2.6741E+03 | -1.3161E+04 | 4.2564E+04 |
| S7 | -3.2047E-01 | -2.3625E+00 | 3.2674E+01 | -2.6193E+02 | 1.5071E+03 | -6.4942E+03 | 2.0663E+04 |
| S8 | -5.6557E-02 | -3.4182E+00 | 2.7331E+01 | -1.3452E+02 | 4.7258E+02 | -1.2293E+03 | 2.3952E+03 |
| S9 | 2.3850E-01 | -1.8962E+00 | 4.6047E+00 | 7.5010E+00 | -9.8085E+01 | 3.8493E+02 | -9.2659E+02 |
| S10 | 5.2172E-01 | -1.9788E+00 | 6.3393E+00 | -1.8567E+01 | 5.0938E+01 | -1.1878E+02 | 2.1421E+02 |
| S11 | -4.3975E-02 | -1.3122E+00 | 4.1364E+00 | -7.6742E+00 | 9.6992E+00 | -8.6633E+00 | 5.5315E+00 |
| S12 | -8.2845E-01 | 1.0031E+00 | -1.0638E+00 | 9.0434E-01 | -5.9791E-01 | 3.0521E-01 | -1.2055E-01 |
TABLE 2-1
Tables 2 to 2
With continued reference to fig. 2-4, the plurality of spacer elements of the imaging systems 110, 120, and 130 may include a first spacer element P1 located between the first lens E1 and the second lens E2, a second spacer element P2 located between the second lens E2 and the third lens E3 (the second spacer element P2 may be implemented as a stop STO), a third spacer element P3 located between the third lens E3 and the fourth lens E4, a fourth spacer element P4 located between the fourth lens E4 and the fifth lens E5, a fifth spacer element P5 located between the fifth lens E5 and the sixth lens E6, and a sixth spacer element P6 located on an image-side surface side of the sixth lens E6, respectively. Through reasonable arrangement of the spacing elements, the overall strength and stability of the imaging system can be enhanced, and stray light can be effectively blocked. In addition, the field curvature can be effectively improved by adjusting the thickness of the first spacing element P1, so that the optical system has good optical performance. The spacing elements of the imaging systems 110, 120, 130 and the basic parameters of the lens barrel are shown in detail in table 7 below.
Fig. 5A shows on-axis chromatic aberration curves of the imaging systems 110, 120, and 130 of embodiment 1, which represent convergent focus deviations of light rays of different wavelengths after passing through the imaging systems. Fig. 5B shows astigmatism curves representing meridional field curvature and sagittal field curvature of image planes of the imaging systems 110, 120, and 130 of embodiment 1. Fig. 5C shows distortion curves for imaging systems 110, 120, and 130 of embodiment 1, which represent distortion magnitude values for different image heights. As can be seen from fig. 5A to 5C, the imaging systems 110, 120, and 130 according to embodiment 1 can achieve good imaging quality.
Example 2
An imaging system according to embodiment 2 of the present application is described below with reference to fig. 6 to 9C. Fig. 6 to 8 respectively show structural schematic diagrams of an imaging system 210, an imaging system 220, and an imaging system 230 according to embodiment 2 of the present application.
As shown in fig. 6 to 8, the imaging system 210, the imaging system 220, and the imaging system 230 each include a lens group E1 to E6, a plurality of spacing elements P1 to P6, and a lens barrel, respectively.
The imaging system 210, the imaging system 220, and the imaging system 230 can employ the same lens group, which in order from an object side to an image side comprises: 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 first lens element E1 has negative power, and has a concave object-side surface S1 and a convex image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive refractive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has a negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12.
Optionally, the imaging systems 210, 220, and 230 may also each include filters and an imaging plane (not shown). The filter has an object side S13 (not shown) and an image side S14 (not shown). The light from the object passes through the first lens E1 to the filter in order and is finally imaged on the imaging plane S15 (not shown).
In this example, the total effective focal length f of the imaging systems 210, 220, and 230 is 1.83mm, and the on-axis distance TD from the object-side surface of the first lens to the image-side surface of the sixth lens of the imaging systems 210, 220, and 230 is 3.94mm. The imaging system has an ImgH of 3.20mm for half of the diagonal length of the effective pixel area on the imaging plane.
Table 3 shows a basic parameter table of the imaging systems 210, 220, and 230 of example 2, in which the units of the radius of curvature, the thickness/distance, and the focal length are millimeters (mm). Tables 4-1 and 4-2 show high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.
TABLE 3
TABLE 4-1
| Flour mark | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | -5.5274E-01 | 2.1875E-01 | -6.3380E-02 | 1.3024E-02 | -1.7942E-03 | 1.4841E-04 | -5.5639E-06 |
| S2 | -3.2360E+02 | 2.6301E+02 | .1.5219E+02 | 6.1136E+01 | -1.6197E+01 | 2.5438E+00 | -1.7926E-01 |
| S3 | -1.6120E+02 | 6.4184E+01 | -5.7958E+00 | -2.4563E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S4 | -5.5897E+05 | 1.5416E+06 | -3.0429E+06 | 4.1817E+06 | -3.7960E+06 | 2.0444E+06 | -4.9434E+05 |
| S5 | 2.5413E+04 | -1.4461E+04 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S6 | -1.0301E+05 | 1.3752E+05 | -1.0485E+05 | 3.4792E+04 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S7 | 7.4585E+05 | -1.7760E+06 | 3.0310E+06 | -3.6126E+06 | 2.8546E+06 | -1.3435E+06 | 2.8506E+05 |
| S8 | -3.8841E+01 | 2.6387E+01 | -1.0628E+01 | 1.9193E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S9 | -3.3073E+03 | 4.4117E+03 | -4.1784E+03 | 2.7461E+03 | -1.1911E+03 | 3.0665E+02 | -3.5479E+01 |
| S10 | -6.1769E+02 | 5.9096E+02 | -4.0214E+02 | 1.8941E+02 | -5.8610E+01 | 1.0706E+01 | -8.7407E-01 |
| S11 | -7.9924E+00 | 3.3132E+00 | -9.9256E-01 | 2.0924E-01 | -2.9440E-02 | 2.4812E-03 | -9.4691E-05 |
| S12 | 5.6387E-02 | -5.2142E-03 | -6.8906E-04 | 2.9638E-04 | -4.2692E-05 | 3.0356E-06 | -8.8817E-08 |
TABLE 4-2
With continued reference to fig. 6-8, the plurality of spacer elements of the imaging systems 210, 220, and 230 may include a first spacer element P1 located between the first lens E1 and the second lens E2, a second spacer element P2 located between the second lens E2 and the third lens E3 (the second spacer element P2 may be implemented as a stop STO), a third spacer element P3 located between the third lens E3 and the fourth lens E4, a fourth spacer element P4 located between the fourth lens E4 and the fifth lens E5, a fifth spacer element P5 located between the fifth lens E5 and the sixth lens E6, and a sixth spacer element P6 located on an image-side surface side of the sixth lens E6, respectively. Through reasonable arrangement of the spacing elements, the overall strength and stability of the imaging system can be enhanced, and stray light can be effectively blocked. In addition, the field curvature can be effectively improved by adjusting the thickness of the first spacing element P1, so that the optical system has good optical performance. The spacing elements of the imaging systems 210, 220, 230 and the basic parameters of the lens barrel are specifically shown in table 7 below.
Fig. 9A shows on-axis chromatic aberration curves of the imaging systems 210, 220, and 230 of embodiment 2, which represent the convergent focus deviations of light rays of different wavelengths after passing through the imaging systems. Fig. 9B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging systems 210, 220, and 230 of embodiment 2. Fig. 9C shows distortion curves for imaging systems 210, 220, and 230 of example 2, which represent distortion magnitude values for different image heights. As can be seen from fig. 9A to 9C, the imaging systems 210, 220, and 230 according to embodiment 2 can achieve good imaging quality.
Example 3
An imaging system according to embodiment 3 of the present application is described below with reference to fig. 10 to 13C. Fig. 10 to 12 respectively show structural schematic diagrams of an imaging system 310, an imaging system 320, and an imaging system 330 according to embodiment 3 of the present application.
As shown in fig. 10 to 12, the imaging system 310, the imaging system 320, and the imaging system 330 each include a lens group E1 to E6, a plurality of spacing elements P1 to P6, and a lens barrel, respectively.
The imaging system 310, the imaging system 320, and the imaging system 330 can employ the same lens group, which in order from an object side to an image side comprises: 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 first lens element E1 has a negative power, and has a concave object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and the object-side surface S3 is convex and the image-side surface S4 is concave. The third lens element E3 has positive refractive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has a negative refractive power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12.
Optionally, imaging systems 310, 320, and 330 may each further include filters and imaging planes (not shown). The filter has an object side S13 (not shown) and an image side S14 (not shown). The light from the object passes through the first lens E1 to the filter in order and is finally imaged on the imaging plane S15 (not shown).
In this example, the total effective focal lengths f of the imaging systems 310, 320, and 330 are each 1.83mm, and the on-axis distances TD from the object-side surface of the first lens to the image-side surface of the sixth lens of the imaging systems 310, 320, and 330 are each 3.96mm. The imaging system has an ImgH of 3.20mm for half of the diagonal length of the effective pixel area on the imaging plane.
Table 5 shows a basic parameter table for the imaging systems 310, 320, and 330 of example 3, in which the units of the radius of curvature, thickness/distance, and focal length are millimeters (mm). Tables 6-1 and 6-2 show the coefficients of high-order terms that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.
TABLE 5
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 4.2282E-01 | -4.6108E-01 | 5.0392E-01 | -4.6307E-01 | 3.4088E-01 | -1.9126E-01 | 7.4774E-02 |
| S2 | 5.7913E-01 | -1.1705E+00 | 4.9204E+00 | -2.0194E+01 | 6.0741E+01 | -1.2862E+02 | 1.9315E+02 |
| S3 | 1.8076E-01 | -2.7685E+00 | 2.2666E+01 | -1.2934E+02 | 4.9418E+02 | -1.2748E+03 | 2.2222E+03 |
| S4 | -1.2479E-03 | 2.3920E+00 | -5.6708E+01 | 8.2863E+02 | -8.3645E+03 | 5.9807E+04 | -3.0543E+05 |
| S5 | -5.6645E-02 | 2.0658E+00 | -3.7662E+01 | 3.9905E+02 | -2.6879E+03 | 1.1353E+04 | -2.9067E+04 |
| S6 | -1.2112E-01 | -1.0200E+00 | 1.9956E+01 | -2.4870E+02 | 1.8104E+03 | -8.2862E+03 | 2.4564E+04 |
| S7 | -7.2358E-01 | 7.2804E+00 | -9.0733E+01 | 8.4732E+02 | -5.8455E+03 | 2.9676E+04 | -1.1110E+05 |
| S8 | -5.2447E-01 | 1.9820E+00 | -7.7426E+00 | 2.4954E+01 | -6.3333E+01 | 1.2051E+02 | -1.6470E+02 |
| S9 | -6.0204E-02 | -3.6240E-01 | 4.4336E+00 | -3.0434E+01 | 1.5509E+02 | -5.6253E+02 | 1.4391E+03 |
| S10 | 5.8048E-01 | -2.3946E+00 | 9.8206E+00 | -3.6929E+01 | 1.1797E+02 | -2.9391E+02 | 5.4471E+02 |
| S11 | -1.0721E-01 | -1.1720E+00 | 4.7183E+00 | -1.0754E+01 | 1.6379E+01 | -1.7559E+01 | 1.3585E+01 |
| S12 | -1.0323E+00 | 1.7373E+00 | -2.5454E+00 | 2.8295E+00 | -2.3159E+00 | 1.3933E+00 | -6.1855E-01 |
TABLE 6-1
| Flour mark | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | -1.5423E-02 | -2.0778E-03 | 2.8387E-03 | -1.0553E-03 | 2.1609E-04 | -2.4411E-05 | 1.1904E-06 |
| S2 | -2.0796E+02 | 1.6091E+＜2 | -8.8648E+01 | 3.3904E+01 | -8.5517E+00 | 1.2787E+00 | -8.5787E-02 |
| S3 | -2.5742E+03 | 1.8963E+03 | -8.0359E+02 | 1.4910E+02 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S4 | 1.1176E+06 | -2.9212E+06 | 5.3891E+06 | -6.8305E+06 | 5.6422E+06 | -2.7266E+06 | 5.8274E+05 |
| S5 | 4.1087E+04 | -2.4554E+04 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S6 | -4.7156E+04 | 5.6557E+04 | -3.8469E+04 | 1.1305E+04 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S7 | 3.0666E+05 | -6.2047E+05 | 9.0699E+05 | -9.3079E+05 | 6.3544E+05 | -2.5890E+05 | 4.7592E+04 |
| S8 | 1.5507E+02 | -9.4849E+01 | 3.3772E+01 | -5.2925E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
| S9 | -2.6177E+03 | 3.4023E+03 | -3.1397E+03 | 2.0105E+03 | -8.4971E+02 | 2.1314E+02 | -2.4028E+01 |
| S10 | -7.3641E+02 | 7.1844E+02 | -4.9853E+02 | 2.3944E+02 | -7.5554E+01 | 1.4073E+01 | -1.1716E+00 |
| S11 | -7.6735E+00 | 3.1666E+00 | -9.4436E-01 | 1.9818E-01 | -2.7758E-02 | 2.3289E-03 | -8.8476E-05 |
| S12 | 2.0298E-01 | -4.9042E-02 | 8.6141E-03 | -1.0710E-03 | 8.9517E-05 | -4.5229E-06 | 1.0467E-07 |
TABLE 6-2
With continued reference to fig. 10-12, the plurality of spacers of the imaging systems 310, 320, and 330 may include a first spacer element P1 between the first lens E1 and the second lens E2, a second spacer element P2 between the second lens E2 and the third lens E3 (the second spacer element P2 may be implemented as an optical stop STO), a third spacer element P3 between the third lens E3 and the fourth lens E4, a fourth spacer element P4 between the fourth lens E4 and the fifth lens E5, a fifth spacer element P5 between the fifth lens E5 and the sixth lens E6, and a sixth spacer element P6 on the image side of the sixth lens E6, respectively. Through rationally setting up spacing component, can strengthen the holistic intensity of imaging system and stability to can effectively block veiling glare. In addition, the field curvature can be effectively improved by adjusting the thickness of the first spacing element P1, so that the optical system has good optical performance. The spacing elements of the imaging systems 310, 320, 330 and the basic parameters of the lens barrel are shown in more detail in table 7 below.
Fig. 13A shows on-axis chromatic aberration curves of the imaging systems 310, 320, and 330 of embodiment 3, which represent the convergent focus deviations of light rays of different wavelengths after passing through the imaging systems. Fig. 13B shows astigmatism curves representing meridional field curvature and sagittal field curvature of image planes of the imaging systems 310, 320, and 330 of embodiment 3. Fig. 13C shows distortion curves for imaging systems 310, 320, and 330 of example 3, which represent the magnitude of distortion for different image heights. As can be seen from fig. 13A to 13C, the imaging systems 310, 320, and 330 according to embodiment 3 can achieve good imaging quality.
Basic parameters of the spacer elements and the lens barrel of each imaging system provided in embodiments 1 to 3 of the present application are shown in table 7, and satisfy the relationships shown in table 8, respectively.
TABLE 7
TABLE 8
The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging apparatus is equipped with the imaging system described above.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be understood by those skilled in the art that the scope of the present invention is not limited to the specific combination of the above-mentioned features, but also covers other embodiments formed by any combination of the above-mentioned features or their equivalents without departing from the spirit of the present invention. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (16)
1. An imaging system, comprising:
a 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 has a negative focal power, at least one of the first lens and the second lens is a meniscus lens, and an image side surface of the sixth lens has at least one inflection point;
a plurality of spacer elements including a first spacer element positioned between the first lens and the second lens and in contact with an image side surface of the first lens;
a lens barrel accommodating the lens group and the plurality of spacing elements; and
the imaging system satisfies the following conditions:
102<|f1*T12|/(EP01*CP1)<159，
wherein f1 is an effective focal length of the first lens, T12 is an air space between the first lens and the second lens on the optical axis, EP01 is a space between a front end surface of the lens barrel and an object side surface of the first spacer element on the optical axis, and CP1 is a maximum thickness of the first spacer element.
2. The imaging system of claim 1, wherein the imaging system satisfies:
0.5<|f2|/(D1s+d1s)<13.5，
wherein f2 is an effective focal length of the second lens, D1s is an outer diameter of an object-side surface of the first spacer element, and D1s is an inner diameter of the object-side surface of the first spacer element.
3. The imaging system of claim 1, wherein the plurality of spacing elements further comprises:
a second spacer element positioned between the second lens and the third lens and in contact with an image side surface of the second lens, an
The imaging system satisfies the following conditions:
36<(f23/T23)*(D2m/d2m)<54，
wherein f23 is a composite focal length of the second lens element and the third lens element, T23 is an air space between the second lens element and the third lens element on the optical axis, D2m is an outer diameter of an image-side surface of the second spacer element, and D2m is an inner diameter of the image-side surface of the second spacer element.
4. The imaging system of claim 1, wherein the plurality of spacing elements further comprises:
a third spacer element positioned between the third lens and the fourth lens and in contact with an image side surface of the third lens;
a fourth spacer element positioned between the fourth lens element and the fifth lens element and in contact with an image side surface of the fourth lens element;
a fifth spacer element positioned between the fifth lens element and the sixth lens element and in contact with an image side surface of the fifth lens element; and
the imaging system satisfies the following conditions:
d3s<d4s<d5s，
wherein d3s is the inner diameter of the object-side surface of the third spacing element, d4s is the inner diameter of the object-side surface of the fourth spacing element, and d5s is the inner diameter of the object-side surface of the fifth spacing element.
5. The imaging system of claim 4, wherein the plurality of spacing elements further comprises:
a second spacer element positioned between the second lens and the third lens and in contact with the image side surface of the second lens, an
The imaging system satisfies the following conditions:
D2m<D3m<D4m，
wherein D2m is the outer diameter of the image-side surface of the second spacer element, D3m is the outer diameter of the image-side surface of the third spacer element, and D4m is the outer diameter of the image-side surface of the fourth spacer element.
6. The imaging system of claim 1, wherein a maximum thickness of each of the plurality of spacer elements between the first lens and the sixth lens is less than 0.1 millimeters.
7. The imaging system of claim 1, wherein the third lens has a positive optical power, and wherein the object-side surface is convex and the image-side surface is convex.
8. The imaging system of claim 1, wherein the fifth lens and the sixth lens have different positive and negative power properties, and wherein the fifth lens and the sixth lens are meniscus lenses.
9. The imaging system of claim 4, wherein the plurality of spacing elements further comprises:
a second spacer element positioned between the second lens and the third lens and in contact with the image side surface of the second lens, an
The imaging system satisfies:
3<|f3+f4|/(EP23+CP3)<13，
wherein f3 is an effective focal length of the third lens, f4 is an effective focal length of the fourth lens, EP23 is a distance between an image-side surface of the second spacer element and an object-side surface of the third spacer element on the optical axis, and CP3 is a maximum thickness of the third spacer element.
10. The imaging system of claim 4, wherein the imaging system satisfies:
1<|R6*R7|/(d3s*D3s)<14，
wherein R6 is a radius of curvature of an image-side surface of the third lens element, R7 is a radius of curvature of an object-side surface of the fourth lens element, D3s is an inner diameter of an object-side surface of the third spacer element, and D3s is an outer diameter of an object-side surface of the third spacer element.
11. The imaging system of claim 4, wherein the imaging system satisfies:
15<(d3m*d4m)/(CT4*EP34)<30，
wherein d3m is an inner diameter of an image-side surface of the third spacer element, d4m is an inner diameter of an image-side surface of the fourth spacer element, CT4 is a center thickness of the fourth lens on the optical axis, and EP34 is a distance between the image-side surface of the third spacer element and an object-side surface of the fourth spacer element on the optical axis.
12. The imaging system of claim 4, wherein the imaging system satisfies:
1<(D4s+d4s)/f45<7，
wherein D4s is an outer diameter of an object-side surface of the fourth spacer element, D4s is an inner diameter of the object-side surface of the fourth spacer element, and f45 is a composite focal length of the fourth lens element and the fifth lens element.
13. The imaging system of claim 4, wherein the imaging system satisfies:
6<(d5s+D5s)/(CT5+T56)<11，
wherein D5s is an inner diameter of an object-side surface of the fifth spacing element, D5s is an outer diameter of the object-side surface of the fifth spacing element, CT5 is a center thickness of the fifth lens on the optical axis, and T56 is an air space between the fifth lens and the sixth lens on the optical axis.
14. The imaging system of claim 4, wherein the plurality of spacing elements further comprises:
a sixth spacing element in contact with an image-side surface of the sixth lens, an
The imaging system satisfies:
|f6|/|f5|>1；
V6＜50；
EP56/CP6>1，
wherein f6 is an effective focal length of the sixth lens, f5 is an effective focal length of the fifth lens, V6 is an abbe number of the sixth lens, EP56 is a distance between an image-side surface of the fifth spacer element and an object-side surface of the sixth spacer element along the optical axis, and CP6 is a maximum thickness of the sixth spacer element.
15. The imaging system of claim 1, wherein the imaging system satisfies:
2<(d0s*D0s)/(f*TD)<6，
wherein D0s is an inner diameter of the front end surface of the lens barrel, D0s is an outer diameter of the front end surface of the lens barrel, f is an effective focal length of the imaging system, and TD is an interval between an object side surface of the first lens and an image side surface of the sixth lens on the optical axis.
16. The imaging system of claim 14, wherein the imaging system satisfies:
0.2<(f1*f6)/(d1m*d6m)<3.2，
wherein f1 is an effective focal length of the first lens element, f6 is an effective focal length of the sixth lens element, d1m is an inner diameter of an image-side surface of the first spacer element, and d6m is an inner diameter of an image-side surface of the sixth spacer element.
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