CN219695549U - Imaging system - Google Patents
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- CN219695549U CN219695549U CN202320960111.1U CN202320960111U CN219695549U CN 219695549 U CN219695549 U CN 219695549U CN 202320960111 U CN202320960111 U CN 202320960111U CN 219695549 U CN219695549 U CN 219695549U
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Abstract
The application discloses an imaging system. The imaging system includes a lens group, a plurality of spacer elements, and a lens barrel for accommodating the lens group and the plurality of spacer elements. The lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens with focal power from an object side to an image side along an optical axis, wherein the object side of the sixth lens is a convex surface, and the optical axis is a convex surfaceThe image side surface of the seventh lens is a concave surface. The at least one spacer element comprises: and a sixth spacing element located on the image side of the sixth lens and in contact with the image side portion of the sixth lens. The imaging system satisfies: 0 < (D6 s x D6 s)/(R11 x R14) < 19 and 40mm 2 ＜(d0s+d0m)/Fno×L＜55mm 2 。
Description
Technical Field
The present application relates to the field of optical elements, and in particular to an imaging system.
Background
In recent years, with the continuous development of technology, consumer electronic products with photographing function occupy more and more market exposure. Meanwhile, as consumer electronics continue to update and iterate, related industries are driven to continuously optimize and upgrade, such as the most representative mobile phone industry. Along with the continuous optimization and upgrading of the mobile phone industry, the continuous iterative upgrading of an imaging system carried on the mobile phone is driven, and the camera shooting technology of the mobile phone becomes one of main factors for improving the competitiveness of the mobile phone.
However, in the imaging system, there often exist such phenomena as non-ideal outer diameter step between lenses. Under the passing condition, the assembly yield and the imaging quality of the imaging system can be seriously reduced due to the non-ideal outer diameter step difference between lenses. Therefore, how to improve the imaging quality of the imaging system is of great importance.
Disclosure of Invention
An aspect of the present utility model provides an imaging system including, in order from an object side to an image side along an optical axis, a lens group, at least one spacer element, and a lens barrel for accommodating the lens group and the at least one spacer element. The lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side along an optical axis, wherein the object side of the sixth lens is a convex surface, and the image side of the seventh lens is a concave surface. The at least one spacer element includes a sixth spacer element located on the image side of the sixth lens and in contact with the image side portion of the sixth lens. The imaging system can satisfy: 0 < (D6 s x D6 s)/(R11 x R14) < 19 and 40mm 2 ＜(d0s+d0m)/Fno×L＜55mm 2 D6s is the outer diameter of the object side surface of the sixth spacing element, D6s is the inner diameter of the object side surface of the sixth spacing element, R11 is the radius of curvature of the object side surface of the sixth lens, R14 is the radius of curvature of the image side surface of the seventh lens, D0s is the inner diameter of the object side end of the barrel, D0m is the inner diameter of the image side end of the barrel, fno is the aperture value of the imaging system, and L is the maximum height of the barrel.
In one embodiment, at least one of the object-side surface of the first lens to the image-side surface of the seventh lens is an aspherical mirror surface.
In one embodiment, the at least one spacer element further comprises a fourth spacer element located on the image side of the fourth lens and in contact with the image side portion of the fourth lens. The fourth lens and the fifth lens have negative focal power; the imaging system can satisfy: -26 < (f4+f5)/(d4s+d4m) < 0, wherein f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, d4s is the inner diameter of the object side of the fourth spacer element, and d4m is the inner diameter of the image side of the fourth spacer element.
In one embodiment, the sixth lens has positive optical power; the seventh lens has negative focal power; the imaging system can satisfy: 2 < (f 6-f 7)/(CP 6+ CT 7) < 21, wherein f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, CP6 is the maximum thickness of the sixth spacer element, and CT7 is the center thickness of the seventh lens on the optical axis.
In one embodiment, the at least one spacer element further comprises a first spacer element located on the image side of the first lens and in contact with the image side portion of the first lens. The imaging system can satisfy: 10mm < f1/EP01×EPD < 25mm, where f1 is the effective focal length of the first lens, EP01 is the distance from the object side end of the barrel to the object side of the first spacer element in the direction along the optical axis, and EPD is the entrance pupil diameter of the imaging system.
In one embodiment, the at least one spacer element further comprises: the image sensor includes a first spacer element located on an image side of the first lens and in contact with an image side portion of the first lens, a second spacer element located on an image side of the second lens and in contact with an image side portion of the second lens, and a third spacer element located on an image side of the third lens and in contact with an image side portion of the third lens. The imaging system can satisfy: -35 < f2/EP12 < -15 and 12 < f3/EP23 < 60, wherein f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, EP12 is the separation distance in the direction along the optical axis of the image side of the first spacer element to the object side of the second spacer element, and EP23 is the separation distance in the direction along the optical axis of the image side of the second spacer element to the object side of the third spacer element.
In one embodiment, the at least one spacer element further comprises a first spacer element located on the image side of the first lens and in contact with the image side portion of the first lens. The imaging system can satisfy: 3mm < R2/(D1 s-D1 s). Times.CT 1 < 18mm and 0mm < R3/(D1 m-D1 m). Times.CT 2 < 3mm, where R2 is the radius of curvature of the image side of the first lens, D1s is the outer diameter of the object side of the first spacer element, D1s is the inner diameter of the object side of the first spacer element, CT1 is the center thickness of the first lens on the optical axis, R3 is the radius of curvature of the object side of the second lens, D1m is the outer diameter of the image side of the first spacer element, D1m is the inner diameter of the image side of the first spacer element, CT2 is the center thickness of the second lens on the optical axis.
In one embodiment, the at least one spacer element further comprises a second spacer element located on the image side of the second lens and in contact with the image side portion of the second lens. The imaging system can satisfy: 2mm < R4×d2s/(Ct2+Cp2) < 16mm and 18mm < R5×D2m/(Cp2+Ct3) < 80mm, where R4 is the radius of curvature of the image side of the second lens, D2s is the inner diameter of the object side of the second spacer element, CT2 is the center thickness of the second lens on the optical axis, CP2 is the maximum thickness of the second spacer element, R5 is the radius of curvature of the object side of the third lens, D2m is the outer diameter of the image side of the second spacer element, and CT3 is the center thickness of the third lens on the optical axis.
In one embodiment, the at least one spacer element further comprises: a third spacing element located on the image side of the third lens and in contact with the image side portion of the third lens, and a fourth spacing element located on the image side of the fourth lens and in contact with the image side portion of the fourth lens. The imaging system can satisfy: 1 < f3/d3s < 8 and 12 < R8/(EP 34+CP3) < 70, where f3 is the effective focal length of the third lens, d3s is the inner diameter of the object side of the third spacer element, R8 is the radius of curvature of the image side of the fourth lens, EP34 is the separation distance in the direction along the optical axis of the image side of the third spacer element to the object side of the fourth spacer element, and CP3 is the maximum thickness of the third spacer element.
In one embodiment, the at least one spacer element further comprises: a fourth spacing element located on the image side of the fourth lens and in contact with the image side portion of the fourth lens, and a fifth spacing element located on the image side of the fifth lens and in contact with the image side portion of the fifth lens. The imaging system can satisfy: -12 < f4/D4m < 0 and 5 < R10/(EP 45+ T45) < 35, where f4 is the effective focal length of the fourth lens, D4m is the outer diameter of the image side of the fourth spacer element, R10 is the radius of curvature of the image side of the fifth lens, EP45 is the separation distance in the direction along the optical axis of the image side of the fourth spacer element to the object side of the fifth spacer element, and T45 is the air separation of the fourth lens and the fifth lens on the optical axis.
In one embodiment, the at least one spacer element further comprises: the image sensor includes a first spacer element located on an image side of the first lens and in contact with an image side portion of the first lens, a second spacer element located on an image side of the second lens and in contact with an image side portion of the second lens, and a third spacer element located on an image side of the third lens and in contact with an image side portion of the third lens. The imaging system can satisfy: 10mm < (-f1×d1m| |f2×d2m|| f3×d3m|)/f123 < 18mm, where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f123 is the combined focal length of the first lens, the second lens and the third lens, d1m is the inner diameter of the image side of the first spacer element, d2m is the inner diameter of the image side of the second spacer element, and d3m is the inner diameter of the image side of the third spacer element.
In one embodiment, the at least one spacer element further comprises: a first spacer element located on an image side of the first lens and in contact with an image side portion of the first lens; a second spacer element located on the image side of the second lens and in contact with the image side portion of the second lens; a third spacer element located on the image side of the third lens and in contact with the image side portion of the third lens; a fourth spacer element located on the image side of the fourth lens and in contact with the image side portion of the fourth lens; and a fifth spacer element located on an image side of the fifth lens and in contact with an image side portion of the fifth lens.
In one embodiment, the imaging system may satisfy: 40 < Va×EP12/EP23 < 86 and 5 < vb×EP45/EP56 < 40, where Va is the Abbe number of the lens having the smallest absolute value of the effective focal length among the first lens, the second lens and the third lens, vb is the Abbe number of the lens having the largest absolute value of the effective focal length among the fifth lens, the sixth lens and the seventh lens, EP12 is the separation distance in the direction along the optical axis of the image side surface of the first spacer element to the object side surface of the second spacer element, EP23 is the separation distance in the direction along the optical axis of the image side surface of the second spacer element to the object side surface of the third spacer element, EP45 is the separation distance in the direction along the optical axis of the image side surface of the fourth spacer element to the object side surface of the fifth spacer element, and EP56 is the separation distance in the direction along the optical axis of the image side surface of the fifth spacer element to the object side surface of the sixth spacer element.
In one embodiment, the imaging system may satisfy: 2mm < (D1m+D2m+D3m)/Na < 10mm and 10mm < (D4m+D5m+D6m)/Nb < 16mm, wherein Na is the refractive index of the lens having the smallest Abbe number among the first lens, the second lens and the third lens, nb is the refractive index of the lens having the largest Abbe number among the fifth lens, the sixth lens and the seventh lens, D1m is the outer diameter of the image side surface of the first spacer element, 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, D4m is the outer diameter of the image side surface of the fourth spacer element, D5m is the outer diameter of the image side surface of the fifth spacer element, and D6m is the outer diameter of the image side surface of the sixth spacer element.
In one embodiment, the third spacer element has an inside diameter of the object side surface that is smaller than an inside diameter of the object side surface of any one of the first to sixth spacer elements; and an inner diameter of the image side surface of the third spacer element is smaller than an inner diameter of the image side surface of any one of the first to sixth spacer elements.
In one embodiment, the at least one spacer element further comprises an auxiliary spacer element located at the image side of the sixth spacer element and in contact with the image side portion of the sixth spacer element.
In the exemplary embodiment of the present application, by reasonably collocating seven lenses, a spacing element and a lens barrel, and reasonably setting the surface types of the sixth lens and the seventh lens, key technical parameters of an imaging system such as 0 < (D6 s×d6s)/(R11×R14) < 19 and 40mm 2 ＜(d0s+d0m)/Fno×L＜55mm 2 The imaging system provided by the application has the characteristics of good outer diameter section difference, good assembly yield, high imaging quality and the like. For example, the imaging system can have a certain imaging effect by reasonably matching seven lenses, the spacing element and the lens barrel. On the basis, through reasonably setting the curvature radius of the relevant surfaces of the sixth lens and the seventh lens, the relevant dimensions of the lens barrel, the sixth interval element and the like, the sixth lens, the sixth interval element and the seventh lens can have better outer diameter step difference, thereby being beneficial to improving the assembly yield of the imaging system and improving the product competitiveness of the imaging system.
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 accompanying drawings in which:
fig. 1A to 1C are schematic structural views of an imaging system in three embodiments of example 1, respectively;
Fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging system of embodiment 1;
fig. 3A to 3C are schematic structural views of an imaging system in three embodiments of example 2, respectively;
fig. 4A to 4D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging system of embodiment 2;
fig. 5A to 5C are schematic structural views of an imaging system in three embodiments of example 3, respectively;
fig. 6A to 6D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging system of embodiment 3; and
fig. 7 is a partial parametric schematic of an imaging system according to an embodiment of the application.
Detailed Description
For a better understanding of the application, various aspects of the 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 application and is not intended to limit the scope of the 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 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. Thus, a first lens discussed below may also be referred to as a second lens or a third lens, and a first spacer element may also be referred to as a second spacer element or a third spacer element, 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. In particular, 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. It should be understood that the thickness, size and shape of the spacing element and the lens barrel have also been slightly exaggerated in the drawings for convenience of explanation.
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 appreciated that the surface of each spacer element closest to the subject is referred to as the object side of the spacer element, and the surface of each spacer element closest to the imaging plane is referred to as the image side of the spacer element. The surface of the lens barrel closest to the object is referred to as the object side end of the lens barrel, and the surface of the lens barrel closest to the imaging surface is referred to as the image side end of the lens barrel.
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 a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the 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, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The following examples merely illustrate a few embodiments of the present application, which are described in greater detail and are not to be construed as limiting the scope of the application. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which are all within the scope of the present application, for example, the lens group (i.e., the first lens to the seventh lens) of each embodiment of the present application, the lens barrel structure, and the spacer element may be arbitrarily combined, and the lens group of one embodiment is not limited to be combined with the lens barrel structure, the spacer element, and the like of the embodiment. The application will be described in detail below with reference to the drawings in connection with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
The imaging system according to an exemplary embodiment of the present application may include seven lenses having optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The seven lenses are arranged in order from the object side to the image side along the optical axis. Any two adjacent lenses among the first lens to the seventh lens can have a spacing distance therebetween. Any of the first to seventh lenses may have a center thickness on the optical axis.
According to an exemplary embodiment of the present application, each of the first to seventh lenses may have an optical region for optical imaging and a non-optical region extending outward from an outer circumference of the optical region. In general, an optical region refers to a region of a lens for optical imaging, and a non-optical region is a structural region of the lens. During assembly of the imaging system, spacer elements may be provided at the non-optical regions of the respective lenses and the respective lenses may be coupled into the barrel, respectively, by a process such as spot gluing. During imaging of the imaging system, the optical regions of each lens can transmit light from the object to form an optical path, forming a final optical image; the non-optical areas of the assembled lenses are accommodated in the lens barrel which cannot transmit light, so that the non-optical areas do not directly participate in the imaging process of the imaging system. It should be noted that for ease of description, the application is described with the individual lenses being divided into two parts, an optical region and a non-optical region, but it should be understood that both the optical region and the non-optical region of the lens may be formed as a single piece during manufacture rather than as separate two parts.
The imaging system according to an exemplary embodiment of the present application may include at least one spacer element, and may include, for example, at least one of a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, a fifth spacer element, a sixth spacer element, and an auxiliary spacer element. For example, the first spacer element may be located at the image side of the first lens and in contact with the image side portion of the first lens, which may abut against the non-optical region of the image side of the first lens. The second spacer element may be located at the image side of the second lens and in contact with the image side portion of the second lens, which may abut against the non-optical region of the image side of the second lens. The third spacer element may be located on the image side of the third lens and in contact with an image side portion of the third lens, which may rest against a non-optical region of the image side of the third lens. The fourth spacing element may be located on the image side of the fourth lens and in contact with an image side portion of the fourth lens, which may rest against a non-optical region of the image side of the fourth lens. The fifth spacing element may be located on the image side of the fifth lens and in contact with an image side portion of the fifth lens, which may rest against a non-optical region of the image side of the fifth lens. The sixth spacing element may be located on the image side of the sixth lens and in contact with the image side portion of the sixth lens, which may rest against the non-optical region of the image side of the sixth lens. The auxiliary spacer element may be located at the image side of the sixth spacer element and in contact with the image side portion of the sixth spacer element, which may abut at the image side of the sixth spacer element. For example, the first spacer element may be in contact with the non-optical region of the image side of the first lens and may be in contact with the non-optical region of the object side of the second lens. For example, the object-side surface of the first spacer element may be in contact with the non-optical region of the image-side surface of the first lens, and the image-side surface of the first spacer element may be in contact with the non-optical region of the object-side surface of the second lens.
An imaging system according to an exemplary embodiment of the present application may include a lens barrel accommodating a lens group and a plurality of spacer elements. As illustrated in fig. 1A to 1C, the lens barrel may be an integrated lens barrel for accommodating the first to seventh lenses and the first to sixth spacing elements, for example.
According to an exemplary embodiment of the present application, the spacer element may include at least one spacer, which is advantageous for improving the assembly of the imaging system, for shielding parasitic light, and for improving the imaging quality of the imaging system by reasonably setting the number, thickness, inner diameter, and outer diameter of the spacer.
In an exemplary embodiment, the imaging system according to the present application may include a sixth spacing element located at the image side of the sixth lens and in contact with the image side portion of the sixth lens. The imaging system can satisfy: 0 < (D6 s x D6 s)/(R11 x R14) < 19 and 40mm 2 ＜(d0s+d0m)/Fno×L＜55mm 2 D6s is the outer diameter of the object side surface of the sixth spacing element, D6s is the inner diameter of the object side surface of the sixth spacing element, R11 is the radius of curvature of the object side surface of the sixth lens, R14 is the radius of curvature of the image side surface of the seventh lens, D0s is the inner diameter of the object side end of the barrel, D0m is the inner diameter of the image side end of the barrel, fno is the aperture value of the imaging system, and L is the maximum height of the barrel.
In the present application, by reasonably collocating seven lenses, a spacing element and a lens barrel, and reasonably setting the surface of the sixth lens and the seventh lens, key technical parameters of an imaging system such as 0 < (D6 s x D6 s)/(R11 x R14) < 19 and 40mm 2 ＜(d0s+d0m)/Fno×L＜55mm 2 The imaging system provided by the application has the characteristics of good outer diameter section difference, good assembly yield, high imaging quality and the like. For example, the imaging system can have a certain imaging effect by reasonably matching seven lenses, the spacing element and the lens barrel. On the basis, through reasonably setting the curvature radius of the relevant surfaces of the sixth lens and the seventh lens, the relevant dimensions of the lens barrel, the sixth interval element and the like, the sixth lens, the sixth interval element and the seventh lens can have better outer diameter step difference, thereby being beneficial to improving the assembly yield of the imaging system and improving the product competitiveness of the imaging system.
In an exemplary embodiment, both the fourth lens and the fifth lens may have negative optical power. Illustratively, an imaging system according to the present application may include a fourth spacer element located on the image side of the fourth lens and in contact with the image side portion of the fourth lens. The imaging system can satisfy: -26 < (f4+f5)/(d4s+d4m) < 0, wherein f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, d4s is the inner diameter of the object side of the fourth spacer element, and d4m is the inner diameter of the image side of the fourth spacer element. Satisfying-26 < (f4+f5)/(d4s+d4m) < 0, the quality of imaging light rays can be ensured to the greatest extent when the light rays diverged by the fourth lens pass through the fourth interval element through reasonable control of the effective focal lengths of the fourth lens and the fifth lens and the inner diameter dimension of the fourth interval element, and the generation of light rays such as stray light is reduced, so that the quality of an imaging system is improved.
In an exemplary embodiment, the sixth lens may have positive optical power; the seventh lens may have negative optical power. Illustratively, an imaging system according to the present application may satisfy: 2 < (f 6-f 7)/(CP 6+ CT 7) < 21, wherein f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, CP6 is the maximum thickness of the sixth spacer element, and CT7 is the center thickness of the seventh lens on the optical axis. The application can ensure the quality of light rays passing through the sixth lens and the seventh lens by reasonably setting the focal power of the sixth lens and the seventh lens. Illustratively, satisfying 2 < (f 6-f 7)/(CP 6+ CT 7) < 21, the dimensions of the sixth lens and the seventh lens in the optical axis direction and the direction perpendicular to the optical axis can be within a reasonable interval range by controlling the relation among the effective focal lengths of the sixth lens and the seventh lens, the relevant dimensions of the sixth spacing element, and the center thickness of the seventh lens, thereby facilitating improvement of the assembly stability of the imaging system and the product quality of the imaging system.
In an exemplary embodiment, an imaging system according to the present application may include a first spacer element located at an image side of a first lens and in contact with an image side portion of the first lens. The imaging system can satisfy: 10mm < f1/EP01×EPD < 25mm, where f1 is the effective focal length of the first lens, EP01 is the distance from the object side end of the barrel to the object side of the first spacer element in the direction along the optical axis, and EPD is the entrance pupil diameter of the imaging system. Satisfies 10mm < f1/EP01×EPD < 25mm, can realize on the basis that incident light is sufficient through controlling the relation between the effective focal length of the first lens, the entrance pupil diameter and the spacing distance between the object side end of the lens barrel and the object side surface of the first spacing element in the direction along the optical axis, the first lens has higher structural uniformity and higher molding feasibility, and is further favorable for improving the imaging quality of an imaging system.
In an exemplary embodiment, an imaging system according to the present application may include a first spacer element located at an image side of a first lens and in contact with an image side portion of the first lens, a second spacer element located at an image side of a second lens and in contact with an image side portion of the second lens, and a third spacer element located at an image side of a third lens and in contact with an image side portion of the third lens. The imaging system can satisfy: -35 < f2/EP12 < -15 and 12 < f3/EP23 < 60, wherein f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, EP12 is the separation distance in the direction along the optical axis of the image side of the first spacer element to the object side of the second spacer element, and EP23 is the separation distance in the direction along the optical axis of the image side of the second spacer element to the object side of the third spacer element. Satisfying-35 < f2/EP12 < -15 and 12 < f3/EP23 < 60, the stability of the integral structure of the second lens and the third lens in the radial direction (i.e. the direction perpendicular to the optical axis) can be improved by controlling the ratio of the effective focal length of the second lens to the axial distance between the first spacing element and the second spacing element and the ratio of the effective focal length of the third lens to the axial distance between the second spacing element and the third spacing element, thereby being beneficial to improving the stability of the integral structure of the lens group in the axial direction (i.e. the direction of the optical axis) and the radial direction, and ensuring the assembly yield of the imaging system.
In an exemplary embodiment, an imaging system according to the present application may include a first spacer element located at an image side of a first lens and in contact with an image side portion of the first lens. The imaging system can satisfy: 3mm < R2/(D1 s-D1 s). Times.CT 1 < 18mm and 0mm < R3/(D1 m-D1 m). Times.CT 2 < 3mm, where R2 is the radius of curvature of the image side of the first lens, D1s is the outer diameter of the object side of the first spacer element, D1s is the inner diameter of the object side of the first spacer element, CT1 is the center thickness of the first lens on the optical axis, R3 is the radius of curvature of the object side of the second lens, D1m is the outer diameter of the image side of the first spacer element, D1m is the inner diameter of the image side of the first spacer element, CT2 is the center thickness of the second lens on the optical axis. Satisfying the relationship between 3mm < R2/(D1 s-D1 s). Times.CT 1 < 18mm and 0mm < R3/(D1 m-D1 m). Times.CT 2 < 3mm, the non-imaging light refracted from the first lens can be reduced by controlling the relationship among the curvature radius of the image side surface of the first lens, the difference between the inner and outer diameters of the side surfaces of the first spacing element and the center thickness of the first lens, and the relationship among the curvature radius of the object side surface of the second lens, the difference between the inner and outer diameters of the image side surfaces of the first spacing element and the center thickness of the second lens, thereby being beneficial to reducing the stray light of the imaging system and improving the imaging quality of the imaging system.
In an exemplary embodiment, the imaging system according to the present application may include a second spacer element located at the image side of the second lens and in contact with the image side portion of the second lens. The imaging system can satisfy: 2mm < R4×d2s/(Ct2+Cp2) < 16mm and 18mm < R5×D2m/(Cp2+Ct3) < 80mm, where R4 is the radius of curvature of the image side of the second lens, D2s is the inner diameter of the object side of the second spacer element, CT2 is the center thickness of the second lens on the optical axis, CP2 is the maximum thickness of the second spacer element, R5 is the radius of curvature of the object side of the third lens, D2m is the outer diameter of the image side of the second spacer element, and CT3 is the center thickness of the third lens on the optical axis. Satisfies 2mm < R4×d2s/(CT2+CP2) < 16mm and 18mm < R5×D2m/(CP2+CT3) < 80mm, and the dimensions of the non-optical areas of the second lens and the third lens, the dimensions of the second spacing element, and the like can be reasonably designed by controlling the relationship among the curvature radius, the center thickness, and the dimensions of the second spacing element of the second lens and the third lens, thereby being beneficial to ensuring the stability of assembly and improving the product yield of the imaging system.
In an exemplary embodiment, the imaging system according to the present application may include a third spacer element located at the image side of the third lens and in contact with the image side portion of the third lens, and a fourth spacer element located at the image side of the fourth lens and in contact with the image side portion of the fourth lens. The imaging system can satisfy: 1 < f3/d3s < 8 and 12 < R8/(EP 34+CP3) < 70, where f3 is the effective focal length of the third lens, d3s is the inner diameter of the object side of the third spacer element, R8 is the radius of curvature of the image side of the fourth lens, EP34 is the separation distance in the direction along the optical axis of the image side of the third spacer element to the object side of the fourth spacer element, and CP3 is the maximum thickness of the third spacer element. Satisfies 1 < f3/d3s < 8 and 12 < R8/(EP 34+CP3) < 70, the number of non-imaging light rays refracted to the fourth lens through the third lens can be reduced by controlling the ratio of the effective focal length of the third lens to the inner diameter of the object side surface of the third spacing element and adding the ratio among the curvature radius of the image side surface of the fourth lens, the maximum thickness of the third spacing element and the axial distance between the third spacing element and the fourth spacing element, and meanwhile, the stable structure can be formed among the third lens, the fourth lens and peripheral elements thereof such as the third spacing element, thereby being beneficial to improving the imaging quality and the assembly yield of the system.
In an exemplary embodiment, the imaging system according to the present application may include a fourth spacing element located at the image side of the fourth lens and in contact with the image side portion of the fourth lens, and a fifth spacing element located at the image side of the fifth lens and in contact with the image side portion of the fifth lens. The imaging system can satisfy: -12 < f4/D4m < 0 and 5 < R10/(EP 45+ T45) < 35, where f4 is the effective focal length of the fourth lens, D4m is the outer diameter of the image side of the fourth spacer element, R10 is the radius of curvature of the image side of the fifth lens, EP45 is the separation distance in the direction along the optical axis of the image side of the fourth spacer element to the object side of the fifth spacer element, and T45 is the air separation of the fourth lens and the fifth lens on the optical axis. Satisfies-12 < f4/D4m < 0 and 5 < R10/(EP 45+T45) < 35, the ratio of the effective focal length of the fourth lens to the inner diameter of the image side of the adjacent fourth spacing element can be controlled, and the ratio of the curvature radius of the image side of the fifth lens to the distances between the fourth lens, the fifth lens and peripheral elements thereof such as the fourth spacing element and the fifth spacing element in the direction of the optical axis can be controlled, so that the light rays passing through the fourth lens can be prevented from being maximally transferred to the position of the non-optical area of the fifth lens, and meanwhile, the fourth lens, the fifth lens and the peripheral elements thereof such as the fourth spacing element and the fifth spacing element can be ensured to have better structural dimensions, thereby being beneficial to improving the imaging quality of the system and the reliability of products.
In an exemplary embodiment, an imaging system according to the present application may include a first spacer element located at an image side of a first lens and in contact with an image side portion of the first lens, a second spacer element located at an image side of a second lens and in contact with an image side portion of the second lens, and a third spacer element located at an image side of a third lens and in contact with an image side portion of the third lens. The imaging system can satisfy: 10mm < (-f1×d1m| |f2×d2m|| f3×d3m|)/f123 < 18mm, where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f123 is the combined focal length of the first lens, the second lens and the third lens, d1m is the inner diameter of the image side of the first spacer element, d2m is the inner diameter of the image side of the second spacer element, and d3m is the inner diameter of the image side of the third spacer element. Satisfying 10mm < (-f1×d1m| f2×d2m|| f3×d3m|)/f123 < 18mm, the generation of non-imaging light rays in the first lens, the second lens and the third lens can be reduced by controlling the relation among the effective focal lengths of the first lens, the second lens and the third lens, the inner diameter of the image side surface of a spacing element connected with the three lenses and the combined focal length of the three lenses, and the uniformity of the sizes of the first lens, the second lens and the third lens in the optical axis direction can be controlled, thereby being beneficial to improving the product stability and the product yield of the system.
In an exemplary embodiment, an imaging system according to the present application may include a first spacer element located on an image side of a first lens and in contact with an image side portion of the first lens; a second spacer element located on the image side of the second lens and in contact with the image side portion of the second lens; a third spacer element located on the image side of the third lens and in contact with the image side portion of the third lens; a fourth spacer element located on the image side of the fourth lens and in contact with the image side portion of the fourth lens; and a fifth spacer element located on an image side of the fifth lens and in contact with an image side portion of the fifth lens.
In an exemplary embodiment, the imaging system according to the present application may satisfy: 40 < Va×EP12/EP23 < 86 and 5 < vb×EP45/EP56 < 40, where Va is the Abbe number of the lens having the smallest absolute value of the effective focal length among the first lens, the second lens and the third lens, vb is the Abbe number of the lens having the largest absolute value of the effective focal length among the fifth lens, the sixth lens and the seventh lens, EP12 is the separation distance in the direction along the optical axis of the image side surface of the first spacer element to the object side surface of the second spacer element, EP23 is the separation distance in the direction along the optical axis of the image side surface of the second spacer element to the object side surface of the third spacer element, EP45 is the separation distance in the direction along the optical axis of the image side surface of the fourth spacer element to the object side surface of the fifth spacer element, and EP56 is the separation distance in the direction along the optical axis of the image side surface of the fifth spacer element to the object side surface of the sixth spacer element. Satisfying 40 < VaxEP 12/EP23 < 86 and 5 < VxEP 45/EP56 < 40, the refractive index and dispersion generated by the first lens to the third lens and the refractive index and dispersion generated by the fifth lens to the seventh lens can be balanced through the relation between the Abbe number of the relevant lens and the axial distance between the relevant interval elements, so that the imaging system has better imaging quality and improves the overall imaging quality of the system on the premise of satisfying structural stability.
In an exemplary embodiment, the imaging system according to the present application may satisfy: 2mm < (D1m+D2m+D3m)/Na < 10mm and 10mm < (D4m+D5m+D6m)/Nb < 16mm, wherein Na is the refractive index of the lens having the smallest Abbe number among the first lens, the second lens and the third lens, nb is the refractive index of the lens having the largest Abbe number among the fifth lens, the sixth lens and the seventh lens, D1m is the outer diameter of the image side surface of the first spacer element, 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, D4m is the outer diameter of the image side surface of the fourth spacer element, D5m is the outer diameter of the image side surface of the fifth spacer element, and D6m is the outer diameter of the image side surface of the sixth spacer element. Satisfies 2mm < (D1m+D2m+D3m)/Na < 10mm and 10mm < (D4m+D5m+D6m)/Nb < 16mm, and can ensure that the imaging system has more sufficient effective imaging light under the condition of more reasonable structural size perpendicular to the optical axis direction by controlling the relation between the outer diameter of the image side surface of each related interval element and the refractive index of the related lens, thereby being beneficial to improving the imaging quality and the assembly stability of the product.
In an exemplary embodiment, the third spacer element has an inner diameter of the object side surface that is smaller than the inner diameter of the object side surface of any one of the first to sixth spacer elements; and an inner diameter of the image side surface of the third spacer element is smaller than an inner diameter of the image side surface of any one of the first to sixth spacer elements. According to the application, the inner diameters of the two sides of the object image of the third interval element are limited to be respectively smaller than the inner diameters of the two sides of the object image of any interval element from the first interval element to the sixth interval element, so that the imaging quality of the off-axis point of the imaging system can be effectively improved, the quality of the finally imaged light of the imaging system is better, and the product quality is improved.
In an exemplary embodiment, the imaging system according to the present application may further include an auxiliary spacer element located at the image side of the sixth spacer element and in contact with the image side portion of the sixth spacer element. The application can improve the performance of the imaging system in the environment test process and improve the reliability of the imaging system by adding the auxiliary spacing element on the image side of the sixth spacing element.
In an exemplary embodiment, the imaging system according to the application further comprises a diaphragm arranged between the object side and the first lens. Optionally, the 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 with the characteristics of good outer diameter section difference, high assembly yield, high imaging quality and the like. The imaging system according to the above embodiment of the present application may employ a plurality of lenses, such as the seven lenses above. By reasonably distributing the focal power, the surface shape, the material quality, the center thickness of each lens, the axial spacing between each lens and the like, incident light rays can be effectively converged, the optical total length of the imaging system is reduced, and the processability of the imaging system is improved, so that the imaging system is more beneficial to production and processing. In the imaging system according to the embodiment of the application, the interval element is arranged between the adjacent lenses and the inner diameter and the outer diameter of the interval element are designed according to the light path, so that stray light can be effectively shielded and eliminated, and the imaging quality of the imaging system is improved.
In an embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror, i.e., at least one of the object side surface of the first lens to the image side surface of the seventh lens is an aspherical mirror. 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 at the time of imaging can be eliminated as much as possible, thereby improving imaging quality. 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, the sixth lens, and the seventh lens is an aspherical mirror surface. Optionally, the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are aspherical mirror surfaces.
However, those skilled in the art will appreciate 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 scope of the application as claimed. For example, although seven lenses are described as an example in the embodiment, the imaging system is not limited to include seven lenses. The imaging system may also include other numbers of lenses, if desired.
Specific examples of imaging systems applicable to the above-described embodiments are further described below with reference to the accompanying drawings.
Example 1
An imaging system according to embodiment 1 of the present application is described below with reference to fig. 1A to 2D. Fig. 1A to 1C show imaging systems in three embodiments in example 1, respectively.
As shown in fig. 1A to 1C, the imaging system sequentially includes, from an object side to an image side: stop STO (not shown), first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter (not shown), and imaging plane (not shown).
The first lens element E1 has positive 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 negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive 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 negative 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 negative refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging plane.
Table 1 shows the basic parameter table of the imaging system of example 1, in which the radius of curvature, thickness/distance, and focal length are all in millimeters (mm).
TABLE 1
In this example, the entrance pupil diameter EPD of the imaging system is 3.3634mm, the aperture value Fno of the imaging system is 1.6050, the total effective focal length f of the imaging system is 5.3500mm, and the combined focal length f123 of the first, second and third lenses is 6.2340mm.
As shown in fig. 1A to 1C, the imaging system may include six spacer elements, which are a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth spacer element P6, respectively. The lens barrel may accommodate the first to seventh lenses E1 to E7 and the first to sixth spacing elements P1 to P6.
Table 2 shows basic parameter tables for each spacer element in three embodiments in the imaging system of example 1, wherein each basic parameter is in millimeters (mm).
TABLE 2
It should be understood that in this example, the structures and parameters of each spacer element are merely exemplified for three embodiments, and the specific structures and actual parameters of each spacer element are not explicitly defined. The specific structure and the actual parameters of the individual spacer elements may be set in any suitable manner in the actual production.
In embodiment 1, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical 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. The following tables 3-1 and 3-2 give the higher order coefficients A that can be used for each of the aspherical mirror surfaces S1-S14 in example 1 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 。
TABLE 3-1
| Face number | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | -9.4103E-05 | -4.1630E-04 | -3.8099E-04 | -2.1405E-04 | -5.1519E-05 | 8.8568E-06 | 1.4036E-05 |
| S2 | 3.6397E-04 | 1.8762E-04 | 1.4137E-04 | 6.4283E-05 | 3.1819E-05 | 9.4809E-06 | 3.8619E-06 |
| S3 | 2.6853E-05 | -6.2195E-05 | 8.8617E-06 | 3.3921E-06 | 7.5427E-06 | 3.2918E-06 | 2.5167E-06 |
| S4 | -4.3883E-05 | 1.9318E-05 | 1.2732E-04 | 7.4012E-05 | 3.2697E-05 | 1.0539E-05 | 6.1527E-06 |
| S5 | 5.9279E-06 | -2.6946E-05 | 1.8564E-05 | 1.8551E-05 | 2.4433E-06 | -1.7725E-06 | -1.4877E-06 |
| S6 | -5.7149E-05 | -7.9166E-05 | -7.6705E-05 | -6.3871E-05 | -4.4735E-05 | -3.0256E-05 | -1.4826E-05 |
| S7 | 1.0199E-03 | 8.1832E-04 | 5.6065E-04 | 2.8215E-04 | 9.2917E-05 | 8.3402E-06 | -6.3203E-06 |
| S8 | 2.1987E-05 | 1.1915E-04 | 2.4236E-04 | -9.2950E-06 | -5.6427E-05 | -2.9516E-05 | 1.5478E-05 |
| S9 | -4.6319E-03 | 7.0973E-04 | 2.4308E-03 | 2.6609E-03 | 2.1781E-03 | 1.0988E-03 | 2.4510E-04 |
| S10 | -5.6080E-03 | 2.9467E-03 | 4.5454E-03 | 1.8360E-03 | 9.3769E-05 | -2.1195E-04 | -4.7674E-05 |
| S11 | -8.0248E-03 | -1.3795E-03 | 1.3642E-03 | -7.1314E-04 | -1.2338E-03 | -7.7232E-04 | -1.4845E-04 |
| S12 | -3.0442E-03 | -7.0045E-04 | 2.9545E-04 | 1.4016E-03 | 1.1175E-03 | -1.6739E-04 | 1.6213E-04 |
| S13 | 6.6682E-03 | -6.4947E-03 | 3.8924E-03 | -1.6395E-03 | 9.8275E-04 | -7.9248E-05 | 7.0694E-04 |
| S14 | 2.1495E-02 | -5.3404E-03 | 2.6215E-03 | -5.8258E-03 | 6.2902E-04 | 7.8677E-06 | 1.3763E-03 |
TABLE 3-2
Fig. 2A shows an on-axis chromatic aberration curve of the imaging system of embodiment 1, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the imaging system. Fig. 2B shows an astigmatism curve of the imaging system of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 2C shows a distortion curve of the imaging system of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 2D shows a magnification chromatic aberration curve of the imaging system of embodiment 1, which represents the deviation of different image heights on the imaging plane after light passes through the imaging system. As can be seen from fig. 2A to 2D, the imaging system of 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. 3A to 4D. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 3A to 3C show imaging systems in three implementations in example 1, respectively.
As shown in fig. 3A to 3C, the imaging system sequentially includes, from an object side to an image side: stop STO (not shown), first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter (not shown), and imaging plane (not shown).
The first lens element E1 has positive 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 negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive 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 negative 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 negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging plane.
In this example, the entrance pupil diameter EPD of the imaging system is 3.2043mm, the aperture value Fno of the imaging system is 1.6050, the total effective focal length f of the imaging system is 5.1000mm, and the combined focal length f123 of the first, second and third lenses is 5.9896mm.
As shown in fig. 3A to 3C, the imaging system may include six spacer elements, which are a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth spacer element P6, respectively. The lens barrel may accommodate the first to seventh lenses E1 to E7 and the first to sixth spacing elements P1 to P6.
It should be understood that in this example, the structures and parameters of each spacer element are merely exemplified for three embodiments, and the specific structures and actual parameters of each spacer element are not explicitly defined. The specific structure and the actual parameters of the individual spacer elements may be set in any suitable manner in the actual production.
Table 4 shows the basic parameter table of the imaging system of example 2, wherein the radius of curvature, thickness/distance and focal length are all in millimeters (mm). Table 5 shows basic parameter tables for each spacer element in three embodiments in the imaging system of example 2, where each basic parameter is in millimeters (mm). Tables 6-1 and 6-2 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface profiles can be defined by the formula (1) given in example 1 above.
TABLE 4 Table 4
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TABLE 5
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TABLE 6-1
| Face number | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | 5.4988E-05 | -5.4433E-05 | -8.9625E-05 | -8.3927E-05 | -5.5511E-05 | -2.5337E-05 | -7.0474E-06 |
| S2 | -3.3897E-06 | 3.1116E-05 | -9.1854E-06 | 2.4436E-06 | -7.0865E-07 | 5.4419E-07 | 1.8744E-06 |
| S3 | -7.1546E-05 | 5.8557E-06 | -9.9727E-06 | 1.1210E-05 | 4.0042E-06 | 3.0183E-06 | 7.2508E-07 |
| S4 | -3.5395E-04 | -1.5662E-04 | 1.1118E-05 | 3.9498E-05 | 1.3346E-06 | -1.2978E-05 | -5.9138E-06 |
| S5 | 1.0860E-05 | -6.8408E-05 | -1.5493E-05 | 3.0146E-05 | 2.3297E-05 | 1.2164E-05 | 3.1137E-06 |
| S6 | 8.1175E-05 | 4.4291E-05 | 2.2905E-05 | 1.5129E-05 | 8.7182E-06 | 4.6956E-06 | -6.4401E-07 |
| S7 | -1.9179E-04 | -8.6678E-05 | 8.1725E-06 | 3.3655E-05 | 4.9980E-05 | 2.9998E-05 | 2.4008E-05 |
| S8 | -1.1010E-03 | -6.6169E-04 | -4.6696E-04 | -3.4839E-04 | -1.6943E-04 | -3.0849E-05 | 1.5219E-05 |
| S9 | 8.1969E-06 | 9.1252E-04 | 5.9360E-04 | 6.4565E-05 | -1.4234E-04 | -3.6324E-05 | -1.1997E-06 |
| S10 | -1.7551E-03 | -6.8445E-04 | -8.6572E-04 | -1.4782E-03 | -1.6204E-03 | -8.8244E-04 | -2.3847E-04 |
| S11 | -2.4644E-03 | 2.3623E-03 | -1.8636E-03 | -6.4305E-04 | 8.4792E-04 | 3.0522E-04 | -2.5797E-04 |
| S12 | -6.0014E-03 | 6.7948E-04 | 1.9489E-03 | 2.4415E-03 | -1.4239E-04 | -9.4879E-04 | 6.1791E-05 |
| S13 | -1.3802E-02 | 1.5381E-02 | -4.4567E-03 | -2.9032E-03 | 2.4319E-03 | -9.9191E-04 | 5.0367E-05 |
| S14 | 5.4210E-03 | -4.7840E-03 | 1.0702E-03 | -1.2105E-03 | 5.0780E-04 | -3.3538E-04 | 1.6220E-04 |
TABLE 6-2
Fig. 4A shows an on-axis chromatic aberration curve of the imaging system of embodiment 2, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the imaging system. Fig. 4B shows an astigmatism curve of the imaging system of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4C shows a distortion curve of the imaging system of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4D shows a magnification chromatic aberration curve of the imaging system of embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the imaging system. As can be seen from fig. 4A to 4D, the imaging system 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. 5A to 6D. Fig. 5A to 5C show imaging systems in three embodiments in example 3, respectively.
As shown in fig. 5A to 5C, the imaging system sequentially includes, from an object side to an image side: stop STO (not shown), first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter (not shown), and imaging plane (not shown).
The first lens element E1 has positive 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 negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, 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 negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 is concave. The filter has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging plane.
In this example, the entrance pupil diameter EPD of the imaging system is 3.2261mm, the aperture value Fno of the imaging system is 1.6000, the total effective focal length f of the imaging system is 5.1171mm, and the combined focal length f123 of the first, second and third lenses is 5.0098mm.
As shown in fig. 5A to 5C, the imaging system may include six spacer elements, which are a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth spacer element P6, respectively. The lens barrel may accommodate the first to seventh lenses E1 to E7 and the first to sixth spacing elements P1 to P6.
It should be understood that in this example, the structures and parameters of each spacer element are merely exemplified for three embodiments, and the specific structures and actual parameters of each spacer element are not explicitly defined. The specific structure and the actual parameters of the individual spacer elements may be set in any suitable manner in the actual production.
Table 7 shows a basic parameter table of the imaging system of example 3, in which the radius of curvature, thickness/distance, and focal length are all in millimeters (mm). Table 8 shows basic parameter tables for each of the spacing elements of the three embodiments in the imaging system of example 3, wherein each basic parameter is in millimeters (mm). Tables 9-1 and 9-2 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface profiles can be defined by the formula (1) given in example 1 above.
TABLE 7
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TABLE 8
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TABLE 9-1
| Face number | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | 2.5800E-05 | 2.6529E-05 | 1.2869E-05 | 7.2203E-06 | 3.5743E-06 | -1.7591E-06 | -6.2385E-06 |
| S2 | 2.9323E-04 | 2.3662E-04 | 2.3576E-04 | 1.4640E-04 | 7.5466E-05 | 1.9372E-05 | 7.2937E-06 |
| S3 | -1.5015E-05 | -1.3895E-05 | -5.5012E-06 | 5.5279E-06 | -2.1185E-06 | -6.3191E-08 | -4.0656E-06 |
| S4 | -3.0935E-05 | -9.5294E-06 | 3.7631E-05 | 3.3833E-05 | 2.3405E-05 | 1.5087E-05 | 6.2862E-06 |
| S5 | -8.6818E-05 | -1.0521E-04 | -1.7982E-05 | -1.7379E-05 | -2.0597E-06 | -5.4511E-06 | 6.5158E-06 |
| S6 | -1.1236E-04 | 2.2329E-05 | -4.0570E-05 | 1.8773E-05 | -8.9682E-06 | 1.2768E-05 | -6.9813E-06 |
| S7 | -6.0703E-04 | -3.1402E-04 | -1.2997E-04 | -3.5334E-05 | 4.7208E-06 | 1.1849E-05 | 1.0692E-05 |
| S8 | -2.2418E-04 | -5.7782E-04 | -4.9619E-04 | -4.1945E-04 | -2.3762E-04 | -1.0096E-04 | -1.2048E-05 |
| S9 | 1.5149E-03 | 5.0476E-04 | 1.6105E-04 | 6.2040E-05 | -4.1593E-05 | -3.8631E-05 | -3.3061E-05 |
| S10 | 3.5359E-04 | 7.2968E-05 | 2.9641E-04 | -1.1116E-04 | -3.3067E-04 | -2.6436E-04 | -6.8082E-05 |
| S11 | -9.5047E-04 | -1.1878E-03 | -6.9879E-04 | 8.5383E-05 | 2.6072E-04 | -6.4368E-05 | -1.5805E-04 |
| S12 | 1.8950E-03 | 2.7656E-03 | 1.1650E-03 | 2.2176E-03 | 1.6436E-03 | 5.6744E-04 | 2.7846E-04 |
| S13 | -1.4182E-02 | 3.6824E-03 | -3.6749E-03 | -1.3724E-03 | -1.3390E-03 | 6.5400E-04 | -6.1246E-04 |
| S14 | -1.5096E-03 | 2.8316E-03 | -7.8250E-04 | 2.0747E-03 | -6.7786E-04 | -1.7718E-04 | -7.2939E-04 |
TABLE 9-2
Fig. 6A shows an on-axis chromatic aberration curve of the imaging system of embodiment 3, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the imaging system. Fig. 6B shows an astigmatism curve of the imaging system of embodiment 3, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 6C shows a distortion curve of the imaging system of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6D shows a magnification chromatic aberration curve of the imaging system of embodiment 3, which represents the deviation of different image heights on the imaging plane after light passes through the imaging system. As can be seen from fig. 6A to 6D, the imaging system according to embodiment 3 can achieve good imaging quality.
In summary, examples 1 to 3 satisfy the relationships shown in tables 10-1, 10-2 and 10-3, respectively.
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TABLE 10-1
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TABLE 10-2
TABLE 10-3
The application also provides an imaging device, wherein the electronic photosensitive element can be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand alone imaging device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The imaging device is equipped with the imaging system described above.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.
Claims (15)
1. An imaging system, comprising:
the lens assembly comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which have optical power in sequence from an object side to an image side along an optical axis, wherein the object side of the sixth lens is a convex surface, and the image side of the seventh lens is a concave surface;
At least one spacer element comprising: a sixth spacing element located on the image side of the sixth lens and in contact with the image side portion of the sixth lens; and
a lens barrel for accommodating the lens group and the at least one spacer element;
wherein the imaging system satisfies: 0 < (D6 s x D6 s)/(R11 x R14) < 19 and 40mm 2 ＜(d0s+d0m)/Fno×L＜55mm 2 D6s is the outer diameter of the object side surface of the sixth spacing element, D6s is the inner diameter of the object side surface of the sixth spacing element, R11 is the radius of curvature of the object side surface of the sixth lens, R14 is the radius of curvature of the image side surface of the seventh lens, D0s is the inner diameter of the object side end of the lens barrel, D0m is the inner diameter of the image side end of the lens barrel, fno is the aperture value of the imaging system, and L is the maximum height of the lens barrel.
2. The imaging system of claim 1, wherein the at least one spacer element further comprises a fourth spacer element located on the image side of the fourth lens and in contact with the image side portion of the fourth lens, wherein,
the fourth lens and the fifth lens both have negative optical power; and
the imaging system satisfies: -26 < (f4+f5)/(d4s+d4m) < 0, wherein f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, d4s is the inner diameter of the object side of the fourth spacer element, and d4m is the inner diameter of the image side of the fourth spacer element.
3. The imaging system of claim 1, wherein the imaging system comprises a plurality of imaging devices,
the sixth lens has positive optical power;
the seventh lens has negative focal power; and
the imaging system satisfies: 2 < (f 6-f 7)/(CP 6+ CT 7) < 21, wherein f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, CP6 is the maximum thickness of the sixth spacer element, and CT7 is the center thickness of the seventh lens on the optical axis.
4. The imaging system of claim 1, wherein the at least one spacer element further comprises a first spacer element located on the image side of the first lens and in contact with the image side portion of the first lens,
the imaging system satisfies: 10mm < f1/EP01×epd < 25mm, where f1 is an effective focal length of the first lens, EP01 is a distance from an object side end of the lens barrel to an object side surface of the first spacer element in a direction along the optical axis, and EPD is an entrance pupil diameter of the imaging system.
5. The imaging system of claim 1, wherein the at least one spacer element further comprises: a first spacing element located on the image side of the first lens and in contact with the image side portion of the first lens, a second spacing element located on the image side of the second lens and in contact with the image side portion of the second lens, and a third spacing element located on the image side of the third lens and in contact with the image side portion of the third lens,
The imaging system satisfies: -35 < f2/EP12 < -15 and 12 < f3/EP23 < 60, wherein f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, EP12 is the separation distance of the image side of the first spacer element from the object side of the second spacer element in the direction along the optical axis, and EP23 is the separation distance of the image side of the second spacer element from the object side of the third spacer element in the direction along the optical axis.
6. The imaging system of claim 1, wherein the at least one spacer element further comprises a first spacer element located on the image side of the first lens and in contact with the image side portion of the first lens,
the imaging system satisfies: 3mm < R2/(D1 s-D1 s). Times.CT 1 < 18mm and 0mm < R3/(D1 m-D1 m). Times.CT 2 < 3mm, where R2 is the radius of curvature of the image side of the first spacer element, D1s is the outer diameter of the object side of the first spacer element, D1s is the inner diameter of the object side of the first spacer element, CT1 is the center thickness of the first lens on the optical axis, R3 is the radius of curvature of the object side of the second lens, D1m is the outer diameter of the image side of the first spacer element, D1m is the inner diameter of the image side of the first spacer element, CT2 is the center thickness of the second lens on the optical axis.
7. The imaging system of claim 1, wherein the at least one spacer element further comprises a second spacer element located on the image side of the second lens and in contact with the image side portion of the second lens,
the imaging system satisfies: 2mm < R4×d2s/(Ct2+Cp2) < 16mm and 18mm < R5×D2m/(Cp2+Ct3) < 80mm, where R4 is the radius of curvature of the image side of the second lens, D2s is the inner diameter of the object side of the second spacer element, CT2 is the center thickness of the second lens on the optical axis, CP2 is the maximum thickness of the second spacer element, R5 is the radius of curvature of the object side of the third lens, D2m is the outer diameter of the image side of the second spacer element, and CT3 is the center thickness of the third lens on the optical axis.
8. The imaging system of claim 1, wherein the at least one spacer element further comprises: a third spacing element located on the image side of the third lens and in contact with the image side portion of the third lens, and a fourth spacing element located on the image side of the fourth lens and in contact with the image side portion of the fourth lens,
the imaging system satisfies: 1 < f3/d3s < 8 and 12 < R8/(EP 34+CP3) < 70, where f3 is the effective focal length of the third lens, d3s is the inner diameter of the object side of the third spacer element, R8 is the radius of curvature of the image side of the fourth lens, EP34 is the separation distance of the image side of the third spacer element to the object side of the fourth spacer element in the direction along the optical axis, and CP3 is the maximum thickness of the third spacer element.
9. The imaging system of claim 1, wherein the at least one spacer element further comprises: a fourth spacing element located on the image side of the fourth lens and in contact with the image side portion of the fourth lens, and a fifth spacing element located on the image side of the fifth lens and in contact with the image side portion of the fifth lens,
the imaging system satisfies: -12 < f4/D4m < 0 and 5 < R10/(EP 45+ T45) < 35, wherein f4 is the effective focal length of the fourth lens, D4m is the outer diameter of the image side of the fourth spacer element, R10 is the radius of curvature of the image side of the fifth lens, EP45 is the separation distance of the image side of the fourth spacer element to the object side of the fifth spacer element in the direction along the optical axis, and T45 is the air separation of the fourth lens and the fifth lens on the optical axis.
10. The imaging system of claim 1, wherein the at least one spacer element further comprises: a first spacing element located on the image side of the first lens and in contact with the image side portion of the first lens, a second spacing element located on the image side of the second lens and in contact with the image side portion of the second lens, and a third spacing element located on the image side of the third lens and in contact with the image side portion of the third lens,
The imaging system satisfies: 10mm < (-f1×d1m| -f2×d2m|| f3×d3m|)/f123 < 18mm, where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f123 is a combined focal length of the first lens, the second lens, and the third lens, d1m is an inner diameter of an image side surface of the first spacer element, d2m is an inner diameter of an image side surface of the second spacer element, and d3m is an inner diameter of an image side surface of the third spacer element.
11. The imaging system of claim 1, wherein the at least one spacer element further comprises:
a first spacer element located on an image side of the first lens and in contact with an image side portion of the first lens;
a second spacer element located on an image side of the second lens and in contact with an image side portion of the second lens;
a third spacer element located on an image side of the third lens and in contact with an image side portion of the third lens;
a fourth spacing element located on the image side of the fourth lens and in contact with the image side portion of the fourth lens; and
and a fifth spacing element located on the image side of the fifth lens and in contact with the image side portion of the fifth lens.
12. The imaging system of claim 11, wherein the imaging system satisfies: 40 < Va×EP12/EP23 < 86 and 5 < vb×EP45/EP56 < 40, where Va is the Abbe number of the lens having the smallest absolute value of the effective focal length among the first lens, the second lens and the third lens, vb is the Abbe number of the lens having the largest absolute value of the effective focal length among the fifth lens, the sixth lens and the seventh lens, EP12 is the distance between the image side surface of the first spacer element and the object side surface of the second spacer element in the direction along the optical axis, EP23 is the distance between the image side surface of the second spacer element and the object side surface of the third spacer element in the direction along the optical axis, EP45 is the distance between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element in the direction along the optical axis, and EP56 is the distance between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element in the direction along the optical axis.
13. The imaging system of claim 11, wherein the imaging system satisfies: 2mm < (D1m+D2m+D3m)/Na < (D4m+D5m+D6m)/Nb < 16mm, where Na is the refractive index of the lens having the smallest Abbe number among the first, second and third lenses, nb is the refractive index of the lens having the largest Abbe number among the fifth, sixth and seventh lenses, D1m is the outer diameter of the image side of the first spacer element, D2m is the outer diameter of the image side of the second spacer element, D3m is the outer diameter of the image side of the third spacer element, D4m is the outer diameter of the image side of the fourth spacer element, D5m is the outer diameter of the image side of the fifth spacer element, and D6m is the outer diameter of the image side of the sixth spacer element.
14. The imaging system of claim 11, wherein the imaging system comprises a plurality of imaging devices,
an inner diameter of the object side surface of the third spacer element is smaller than an inner diameter of the object side surface of any one of the first to sixth spacer elements; and
an inner diameter of an image side surface of the third spacer element is smaller than an inner diameter of an image side surface of any one of the first to sixth spacer elements.
15. The imaging system of any of claims 1-14, wherein the at least one spacer element further comprises an auxiliary spacer element located on an image side of the sixth spacer element and in contact with an image side portion of the sixth spacer element.
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