Camera system

Abstract

The application discloses a camera system, comprising a lens barrel, a lens group and a plurality of positioning elements accommodated in the lens barrel, an inner ring surface of the lens barrel has at least two steps; the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from an object side to an image side along an optical axis, and among the third lens to the sixth lens, the absolute value of the effective focal length of the sixth lens is the smallest; the plurality of positioning elements comprises a fifth positioning element located on the image side of the fifth lens and in contact with the image side surface of the fifth lens, and a sixth positioning element located on the image side of the sixth lens and in contact with the image side surface of the sixth lens. The effective focal length f6 of the sixth lens, the maximum thickness CP5 of the fifth positioning element along the optical axis direction, the distance EP56 from the image side surface of the fifth positioning element to the object side surface of the sixth positioning element along the optical axis, and the central thickness CT5 of the fifth lens on the optical axis satisfy: -20 < f6 / (CP5+EP56-CT5) < -5.0.

Description

Technical Field

[0001] This application relates to the field of optical components, and more specifically, to a camera system. Background Technology

[0002] In recent years, with the rapid development of technology, people's requirements for mobile phone photography have been continuously increasing. At the same time, the industry has also put forward higher and higher requirements for the performance of camera lenses, which requires improving the quality of lenses while also improving the stability of lens production.

[0003] Among these, the demand for improving the assembly stability and imaging performance of six-element lenses is becoming increasingly significant. However, in current six-element optical systems, there are common problems such as poor assembly stability of the end module composed of the fifth and sixth lenses, unreasonable settings of optical parameters and lens spacing, which affect the field curvature, aberrations, and coma of the lens, resulting in poor lens imaging quality and unreliable system performance stability, seriously affecting lens yield.

[0004] Therefore, how to comprehensively consider various lens components such as lenses, positioning elements, and lens barrels, and further optimize the design of the fifth lens, sixth lens, and their adjacent positioning elements to improve lens quality, enhance production stability, and meet the ever-evolving high demands of the market has become one of the technical problems that urgently need to be solved by those skilled in the art. Summary of the Invention

[0005] This application provides a camera system, which may include a lens barrel and a lens assembly and a plurality of positioning elements housed within the lens barrel. The inner annular surface of the lens barrel has at least two steps; the lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially from the object side to the image side along the optical axis, wherein the sixth lens has the smallest absolute value of its effective focal length among the absolute values ​​of the effective focal lengths of the third to sixth lenses; the plurality of positioning elements includes a fifth positioning element located on the image side of the fifth lens and in contact with the image side surface of the fifth lens, and a sixth positioning element located on the image side of the sixth lens and in contact with the image side surface of the sixth lens. The effective focal length f6 of the sixth lens, the maximum thickness CP5 of the fifth positioning element along the optical axis, the distance EP56 from the image side surface of the fifth positioning element to the object side surface of the sixth positioning element along the optical axis, and the center thickness CT5 of the fifth lens on the optical axis can satisfy: -20 <f6 / (CP5+EP56-CT5)<-5.0。

[0006] In one embodiment, the plurality of positioning elements further includes a first positioning element located on the image side of the first lens and in contact with the image side surface of the first lens; the radius of curvature R2 of the image side surface of the first lens, the radius of curvature R1 of the object side surface of the first lens, the distance EP01 from the object side end face of the lens barrel to the object side surface of the first positioning element along the optical axis, and the center thickness CT1 of the first lens on the optical axis can satisfy: 3.0 < (R2 / R1) × (EP01 / CT1) < 11.

[0007] In one embodiment, the plurality of positioning elements further includes a third positioning element located on the image side of the third lens and in contact with the image side of the third lens, and a fourth positioning element located on the image side of the fourth lens and in contact with the image side of the fourth lens; the radius of curvature R7 of the object side of the fourth lens, the radius of curvature R8 of the image side of the fourth lens, the distance EP34 from the image side of the third positioning element to the object side of the fourth positioning element along the optical axis, and the air gap T34 between the third lens and the fourth lens on the optical axis can satisfy: 1.5 < |R7 / R8| × (EP34 / T34) < 7.5.

[0008] In one embodiment, the plurality of positioning elements further includes a second positioning element located on the image side of the second lens and in contact with the image side of the second lens; the effective focal length f2 of the second lens, the effective focal length f1 of the first lens, the outer diameter D1m of the image side of the first positioning element, and the inner diameter d2s of the object side of the second positioning element can satisfy: -5.0 < (f2 / f1) × ((D1m-d2s) / d2s) < -1.5.

[0009] In one embodiment, the plurality of positioning elements further includes a third positioning element located on the image side of the third lens and in contact with the image side of the third lens; the aperture coefficient Fno of the imaging system, the inner diameter d2s of the object side of the second positioning element, the inner diameter d1s of the object side of the first positioning element, and the inner diameter d3s of the object side of the third positioning element can satisfy: 0.5 <Fno×(d2s-d1s) / (d2s-d3s)<3.5。

[0010] In one embodiment, the entrance pupil diameter EPD of the imaging system, the distance EP01 from the object-side end face of the lens barrel to the object-side surface of the first positioning element along the optical axis, the maximum thickness CP1 of the first positioning element along the optical axis, and the air gap T12 between the first lens and the second lens on the optical axis can satisfy: 3.0 <EPD / (EP01+CP1-T12)<5.0。

[0011] In one embodiment, among the first to the sixth lenses, the Abbe number of the i-th lens is less than 30. A positioning element located on the image side of the i-th lens and in contact with its image side is designated as the i-th positioning element, and a positioning element located on the image side of the (i-1)-th lens and in contact with its image side is designated as the (i-1)-th positioning element. The effective focal length fi of the i-th lens, the Abbe number Vi of the i-th lens, and the distance EP from the image side of the (i-1)-th positioning element to the object side of the i-th positioning element along the optical axis are also defined. (i-1)i It can satisfy: 0 < |fi / Vi| / EP (i-1)i <25, where i is taken from 1, 2, 3, 4, 5, 6.

[0012] In one embodiment, the radius of curvature R8 of the image side of the fourth lens, the radius of curvature R9 of the object side of the fifth lens, and the inner diameter d4s of the object side of the fourth positioning element can satisfy: 5.0 < (R9-R8) / d4s < 8.5.

[0013] In one embodiment, the maximum thickness CP5 of the fifth positioning element along the optical axis, the distance EP56 from the image side of the fifth positioning element to the object side of the sixth positioning element along the optical axis, the center thickness CT6 of the sixth lens on the optical axis, the air gap T56 between the fifth and sixth lenses on the optical axis, and the refractive index N5 of the fifth lens can satisfy: 0.5 < (CP5 + EP56 + CT6) / (T56 × (N5 - 1)) ≤ 2.5.

[0014] In one embodiment, the effective focal length f5 of the fifth lens, the inner diameter d5s of the object-side surface of the fifth positioning element, and the inner diameter d5m of the image-side surface of the fifth positioning element can satisfy: 2.0 <f5 / ((d5s+d5m) / 2)<4.5。

[0015] In one embodiment, the effective focal length f1 of the first lens, the outer diameter D1m of the image side of the first positioning element, and the inner diameter d1s of the object side of the first positioning element can satisfy: 1.5mm. <f1 / ((D1m-d1s) / d1s)<7.0mm。

[0016] In one embodiment, the radius of curvature R3 of the object side of the second lens, the radius of curvature R4 of the image side of the second lens, and the distance EP12 from the image side of the first positioning element to the object side of the second positioning element along the optical axis can satisfy: 35 < |R3 + R4| / EP12 < 55.

[0017] In one embodiment, among the air gaps on the optical axis between any two adjacent lenses from the first lens to the sixth lens, the air gap between the fifth lens and the sixth lens on the optical axis is the largest.

[0018] In one embodiment, the effective focal length of the first lens is less than the absolute value of the effective focal length of the sixth lens.

[0019] The imaging system provided in this application includes a six-piece imaging lens group, a plurality of positioning elements, and a lens barrel. The first to sixth lenses are arranged in sequence from the object side to the image side along the optical axis. Among them, the absolute value of the effective focal length of the sixth lens is the smallest among the absolute values of the effective focal lengths of each lens from the third lens to the sixth lens; the inner ring surface of the lens barrel has at least two steps; and, a fifth positioning element in contact with the image side surface of the fifth lens is provided on the image side of the fifth lens, and a sixth positioning element in contact with the image side surface of the sixth lens is provided on the image side of the sixth lens, and the effective focal length f6 of the sixth lens, the maximum thickness CP5 of the fifth positioning element in the optical axis direction, the distance EP56 from the image side surface of the fifth positioning element to the object side surface of the sixth positioning element along the optical axis, and the central thickness CT5 of the fifth lens on the optical axis satisfy the conditional formula -20 < f6 / (CP5 + EP56 - CT5) < -5.0. Through this setting of the imaging system in this application, the light path after passing through the fifth lens and the sixth lens can be made better, and the maximum adjustment of the system field peak and the field curvature of the outer field can be achieved, which is beneficial for the imaging system to obtain better coma performance; and, the reasonable setting of the distance between the fifth and sixth positioning elements can control the aberration of the front-end optical lenses of the system, make the aberration of the system at a reasonable level, and at the same time, is beneficial for the stable assembly of the fifth and sixth lens groups and is beneficial for improving the structural stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Combined with the drawings, through the detailed description of the following non-limiting embodiments, other features, purposes, and advantages of this application will become more obvious. In the drawings:

[0021] Figure 1 The structure and partial parameter schematic diagram of the imaging system according to an exemplary embodiment of this application are shown;

[0022] Figure 2 The structural schematic diagram of the lens group included in the imaging system according to Embodiment 1 of this application is shown;

[0023] Figures 3 to 5 The structural schematic diagrams of the imaging system according to Embodiment 1 of this application under three embodiments are respectively shown;

[0024] Figures 6 to 9 The axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the imaging system of Embodiment 1 are respectively shown;

[0025] Figure 10 A schematic diagram of the lens group included in the imaging system according to Embodiment 2 of this application is shown;

[0026] Figures 11 to 13 Schematic diagrams of the camera system according to Embodiment 2 of this application are shown in three different implementations.

[0027] Figures 14 to 17 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the camera system of Embodiment 2 are shown respectively.

[0028] Figure 18 A schematic diagram of the lens group included in the imaging system according to Embodiment 3 of this application is shown;

[0029] Figures 19 to 21 Schematic diagrams of the camera system according to Embodiment 3 of this application are shown in three different implementations; and

[0030] Figures 22 to 25 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the camera system of Embodiment 3 are shown respectively. Detailed Implementation

[0031] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0032] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second or third lens.

[0033] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0034] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region can be determined according to methods commonly used in the art, such as using the sign of the R value (R refers to the radius of curvature of the paraxial region) to determine convexity or concavity. In this paper, the surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens. For the object-side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image-side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0035] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0036] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The following embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be pointed out that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] The features, principles and other aspects of this application are described in detail below.

[0039] The imaging system according to an exemplary embodiment of the present application may include a lens barrel, a lens group, and a plurality of positioning elements assembled in the lens barrel. The lens group may be a six-piece lens group, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side to the image side along the optical axis. The plurality of positioning elements may include a fifth positioning element located on the image side of the fifth lens and in contact with the image side surface of the fifth lens, and a sixth positioning element located on the image side of the sixth lens and in contact with the image side surface of the sixth lens.

[0040] In an exemplary embodiment, among the absolute values of the effective focal lengths of each of the four lenses, namely the third lens, the fourth lens, the fifth lens, and the sixth lens, the absolute value of the effective focal length of the sixth lens is the smallest.

[0041] In an exemplary embodiment, the lens barrel may have an object-side end face, an image-side end face, an inner annular surface, and an outer annular surface, wherein the inner annular surface of the lens barrel may have at least two steps.

[0042] In an exemplary embodiment, the imaging system of the present application may satisfy the conditional formula -20 < f6 / (CP5 + EP56 - CT5) < -5.0, where f6 is the effective focal length of the sixth lens, CP5 is the maximum thickness of the fifth positioning element along the optical axis direction, EP56 is the distance along the optical axis from the image side surface of the fifth positioning element to the object side surface of the sixth positioning element, and CT5 is the central thickness of the fifth lens on the optical axis.

[0043] According to the imaging system provided by the present application, it includes a lens barrel, a lens group, and a plurality of positioning elements assembled in the lens barrel. Among them, the lens group includes the first to sixth lenses arranged in sequence from the object side to the image side along the optical axis, and the absolute value of the effective focal length of the sixth lens is the smallest among the absolute values of the effective focal lengths of each of the third lens to the sixth lens; the inner annular surface of the lens barrel has at least two steps; and, a fifth positioning element in contact with the image side surface thereof is provided on the image side of the fifth lens, a sixth positioning element in contact with the image side surface thereof is provided on the image side of the sixth lens, and the effective focal length f6 of the sixth lens, the maximum thickness CP5 of the fifth positioning element along the optical axis direction, the distance EP56 along the optical axis from the image side surface of the fifth positioning element to the object side surface of the sixth positioning element, and the central thickness CT5 of the fifth lens on the optical axis satisfy the conditional formula -20 < f6 / (CP5 + EP56 - CT5) < -5.0. With this setting of the imaging system provided by the present application, the traveling direction of light after passing through the fifth lens and the sixth lens can be better, and the maximum adjustment of the system field-of-view peak and the field curvature of the outer field-of-view can be achieved, which is beneficial for the imaging system to obtain better coma performance; and, the reasonable setting of the distance between the fifth and sixth positioning elements can control the aberration of the front-end optical lenses of the system, making the aberration of the system at a reasonable level. At the same time, it is beneficial for the fifth and sixth lens groups to stand stably, which is beneficial to improving the structural stability of the system.

[0044] In an exemplary embodiment, the plurality of positioning elements may further include: a first positioning element located on the image side of the first lens and in contact with the image side of the first lens; a second positioning element located on the image side of the second lens and in contact with the image side of the second lens; a third positioning element located on the image side of the third lens and in contact with the image side of the third lens; and a fourth positioning element located on the image side of the fourth lens and in contact with the image side of the fourth lens.

[0045] In an exemplary embodiment, the imaging system of this application can satisfy the condition 3.0 < (R2 / R1) × (EP01 / CT1) < 11, where R2 is the radius of curvature of the image-side surface of the first lens, R1 is the radius of curvature of the object-side surface of the first lens, EP01 is the distance along the optical axis from the object-side end face of the lens barrel to the object-side surface of the first positioning element, and CT1 is the center thickness of the first lens on the optical axis. By controlling the radius of curvature of the image-side surface of the first lens, the radius of curvature of the object-side surface of the first lens, the distance along the optical axis from the object-side end face of the lens barrel to the object-side surface of the first positioning element, and the center thickness of the first lens on the optical axis to satisfy the condition 3.0 < (R2 / R1) × (EP01 / CT1) < 11, the structural space of the lens can be effectively reduced, providing more room for correcting positive off-axis aberrations and improving the imaging quality of the system.

[0046] In an exemplary embodiment, the imaging system of this application can satisfy the condition 1.5 < |R7 / R8| × (EP34 / T34) < 7.5, where R7 is the radius of curvature of the object side of the fourth lens, R8 is the radius of curvature of the image side of the fourth lens, EP34 is the distance along the optical axis from the image side of the third positioning element to the object side of the fourth positioning element, and T34 is the air gap between the third and fourth lenses on the optical axis. By controlling the radius of curvature of the object side of the fourth lens, the radius of curvature of the image side of the fourth lens, the distance along the optical axis from the image side of the third positioning element to the object side of the fourth positioning element, and the air gap between the third and fourth lenses on the optical axis to satisfy the condition 1.5 < |R7 / R8| × (EP34 / T34) < 7.5, the light intensity of the off-axis field of view can be effectively controlled, and the sensitivity of the system can be reduced while ensuring the rationality of the lens structure.

[0047] In an exemplary embodiment, the imaging system of the present application can satisfy the conditional formula -5.0 < (f2 / f1) × ((D1m - d2s) / d2s) < -1.5, where f2 is the effective focal length of the second lens, f1 is the effective focal length of the first lens, D1m is the outer diameter of the image side of the first positioning element, and d2s is the inner diameter of the object side of the second positioning element. By controlling the effective focal length of the second lens, the effective focal length of the first lens, the outer diameter of the image side of the first positioning element, and the inner diameter of the object side of the second positioning element to satisfy the conditional formula -5.0 < (f2 / f1) × ((D1m - d2s) / d2s) < -1.5, there can be sufficient adjustment space for the field height of the light rear end face. Structurally, the optical effective outer diameter of the second positioning element can be reduced, thereby making the mechanism compact and achieving the purpose that the imaging system can match multiple lens barrels.

[0048] In an exemplary embodiment, the imaging system of the present application can satisfy the conditional formula 0.5 < Fno × (d2s - d1s) / (d2s - d3s) < 3.5, where Fno is the aperture coefficient of the imaging system, d2s is the inner diameter of the object side of the second positioning element, d1s is the inner diameter of the object side of the first positioning element, and d3s is the inner diameter of the object side of the third positioning element. By controlling the aperture coefficient of the imaging system, the inner diameter of the object side of the second positioning element, the inner diameter of the object side of the first positioning element, and the inner diameter of the object side of the third positioning element to satisfy the conditional formula 0.5 < Fno × (d2s - d1s) / (d2s - d3s) < 3.5, the size of the field angle and the aperture stop can be ensured, and the inner diameter of the first positioning element, the inner diameter of the object side of the second positioning element, and the inner diameter of the object side of the third positioning element can be reduced within a certain range, leaving more space for the structure of the subsequent lenses. On the premise of meeting the optical performance, more stability structures can be used for production.

[0049] In an exemplary embodiment, the imaging system of the present application can satisfy the conditional formula 3.0 < EPD / (EP01 + CP1 - T12) < 5.0, where EPD is the entrance pupil diameter of the imaging system, EP01 is the distance along the optical axis from the object side end face of the lens barrel to the object side face of the first positioning element, CP1 is the maximum thickness of the first positioning element along the optical axis direction, and T12 is the air gap between the first lens and the second lens on the optical axis. By controlling the entrance pupil diameter of the imaging system, the distance along the optical axis from the object side end face of the lens barrel to the object side face of the first positioning element, the maximum thickness of the first positioning element along the optical axis direction, and the air gap between the first lens and the second lens on the optical axis to satisfy the conditional formula 3.0 < EPD / (EP01 + CP1 - T12) < 5.0, the compactness of the lens structure can be achieved, off-axis aberrations can be corrected, and the overall image quality of the system can be improved.

[0050] In an exemplary embodiment, the Abbe number of the i-th lens among the first to sixth lenses is less than 30. The positioning element located on the image side of the i-th lens and in contact with the image side surface of the i-th lens is the i-th positioning element, and the positioning element located on the image side of the (i-1)-th lens and in contact with the image side surface of the (i-1)-th lens is the (i-1)-th positioning element. The imaging system of this application can satisfy the condition 0 < |fi / Vi| / EP. (i-1)i <25, where fi is the effective focal length of the i-th lens, Vi is the Abbe number of the i-th lens, and EP (i-1)i It is the distance along the optical axis from the image-side surface of the (i-1)th positioning element to the object-side surface of the ith positioning element, where i is taken from 1, 2, 3, 4, 5, 6. By controlling the effective focal length of the ith lens, the Abbe number of the ith lens, and the distance along the optical axis from the image-side surface of the (i-1)th positioning element to the object-side surface of the ith positioning element, the condition 0 < |fi / Vi| / EP is satisfied. (i-1)i <25, the spacing between the first to sixth lenses along the optical axis can be adjusted, which ensures that the light transmission of the lens meets the requirements, while facilitating the adjustment of the lens structure and reducing the difficulty of lens processing.

[0051] In an exemplary embodiment, the imaging system of this application can satisfy the condition 5.0 < (R9 - R8) / d4s < 8.5, where R8 is the radius of curvature of the image side of the fourth lens, R9 is the radius of curvature of the object side of the fifth lens, and d4s is the inner diameter of the object side of the fourth positioning element. By controlling the ratio of the difference between the radius of curvature of the object side of the fifth lens and the radius of curvature of the image side of the fourth lens to the inner diameter of the object side of the fourth positioning element within this range, assembly is facilitated, and the inner diameter of the side of the fourth positioning element can be reasonably adjusted. Simultaneously, the outer diameter of the fourth lens can be used to predict the target outer diameter of the front and rear lenses, thereby enabling structural optimization.

[0052] In an exemplary embodiment, the imaging system of the present application can satisfy the conditional formula 0.5 < (CP5 + EP56 + CT6) / (T56 × (N5 - 1)) ≤ 2.5, where CP5 is the maximum thickness of the fifth positioning element along the optical axis direction, EP56 is the distance along the optical axis from the image side of the fifth positioning element to the object side of the sixth positioning element, CT6 is the central thickness of the sixth lens on the optical axis, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, and N5 is the refractive index of the fifth lens. By controlling the maximum thickness of the fifth positioning element along the optical axis direction, the distance along the optical axis from the image side of the fifth positioning element to the object side of the sixth positioning element, the central thickness of the sixth lens on the optical axis, the air gap between the fifth lens and the sixth lens on the optical axis, and the refractive index of the fifth lens to satisfy the conditional formula 0.5 < (CP5 + EP56 + CT6) / (T56 × (N5 - 1)) ≤ 2.5, while ensuring that the aperture meets the requirements of the depth of field and illuminance, the refractive index of the fifth lens can be adjusted to change the distance along the optical axis from the image side of the fifth positioning element to the object side of the sixth positioning element, and then the central thickness of the sixth lens can be adjusted and the air gap between the two lenses can be reduced, effectively reducing the structural space of the lens. Through such adjustment, more space can be provided for the correction of off-axis aberrations and the imaging quality of the system can be improved.

[0053] In an exemplary embodiment, the imaging system of the present application can satisfy the conditional formula 2.0 < f5 / ((d5s + d5m) / 2) < 4.5, where f5 is the effective focal length of the fifth lens, d5s is the inner diameter of the object side of the fifth positioning element, and d5m is the inner diameter of the image side of the fifth positioning element. By controlling the effective focal length of the fifth lens, the inner diameter of the object side of the fifth positioning element, and the inner diameter of the image side of the fifth positioning element to satisfy the conditional formula 2.0 < f5 / ((d5s + d5m) / 2) < 4.5, the central axis distance between the fifth lens and the lenses on the front end face can be reduced during the assembly process, effectively ensuring the consistency of the central optical axes of each lens. During the lens assembly process, the smaller the deviation of the optical axis, the higher the imaging quality of the system.

[0054] In an exemplary embodiment, the imaging system of the present application can satisfy the conditional formula 1.5 mm < f1 / ((D1m - d1s) / d1s) < 7.0 mm, where f1 is the effective focal length of the first lens, D1m is the outer diameter of the image side of the first positioning element, and d1s is the inner diameter of the object side of the first positioning element. By controlling the effective focal length of the first lens, the outer diameter of the image side of the first positioning element, and the inner diameter of the object side of the first positioning element to satisfy the conditional formula 1.5 mm < f1 / ((D1m - d1s) / d1s) < 7.0 mm, the effective focal length of the first lens can be stabilized within a certain range, enabling the imaging system to have a certain accuracy during the assembly process, reducing the error of the central axis distance between the lenses, and improving the imaging quality.

[0055] In an exemplary embodiment, the imaging system of this application can satisfy the condition 35<|R3+R4| / EP12<55, where R3 is the radius of curvature of the object-side surface of the second lens, R4 is the radius of curvature of the image-side surface of the second lens, and EP12 is the distance along the optical axis from the image-side surface of the first positioning element to the object-side surface of the second positioning element. By controlling the radius of curvature of the object-side surface of the second lens, the radius of curvature of the image-side surface of the second lens, and the distance along the optical axis from the image-side surface of the first positioning element to the object-side surface of the second positioning element to satisfy the condition 35<|R3+R4| / EP12<55, the radius of curvature of the rear lens can be tightened while effectively meeting the light intensity requirements, ensuring a compact lens structure. This also helps to reduce the optical axis spacing between lenses, thereby reducing system sensitivity and improving production stability.

[0056] In an exemplary embodiment, among any two adjacent lenses from the first to the sixth lens, the air gap on the optical axis is the largest between the fifth and sixth lenses.

[0057] In an exemplary embodiment, the effective focal length of the first lens is less than the absolute value of the effective focal length of the sixth lens.

[0058] In an exemplary embodiment, the imaging system of this application may include at least one aperture stop. The aperture stop can constrain the optical path and control the light intensity. The aperture stop can be set at an appropriate position in the imaging system; for example, the aperture stop can be set between the object side and the first lens.

[0059] In an exemplary embodiment, the camera system may optionally include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0060] The imaging system according to the above-described embodiment of the present application may include a six-piece imaging lens group, a plurality of positioning elements, and a lens barrel. Among them, the absolute value of the effective focal length of the sixth lens is the smallest among the absolute values of the effective focal lengths of the third to sixth lenses; the inner ring surface of the lens barrel has at least two steps; and, a fifth positioning element in contact with the image side surface thereof is provided on the image side of the fifth lens, and a sixth positioning element in contact with the image side surface thereof is provided on the image side of the sixth lens, and the effective focal length f6 of the sixth lens, the maximum thickness CP5 of the fifth positioning element in the optical axis direction, the distance EP56 along the optical axis from the image side surface of the fifth positioning element to the object side surface of the sixth positioning element, and the central thickness CT5 of the fifth lens on the optical axis satisfy the conditional formula -20 < f6 / (CP5 + EP56 - CT5) < -5.0. This can make the light path after passing through the fifth and sixth lenses better, and can achieve the maximum adjustment of the system field peak and the field curvature of the outer field of view, which is beneficial for the imaging system to obtain better coma performance; and, the reasonable setting of the distance between the fifth and sixth positioning elements can control the aberration of the front-end optical lenses of the system, make the aberration of the system at a reasonable level, and at the same time, is beneficial to the stable assembly of the fifth and sixth lens groups and is beneficial to improving the structural stability of the system.

[0061] In the embodiment of the present application, one or more aspherical surfaces may be provided on the mirror surfaces of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens. The aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and improving astigmatism aberration. After using the aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality.

[0062] However, those skilled in the art should understand that without departing from the technical solution claimed in the present application, the number of lenses constituting the imaging system may be changed, and the number of positioning elements may also be changed to obtain the various results and advantages described in this specification. For example, although six lenses are described as an example in the embodiment, the imaging system is not limited to including six lenses. If necessary, the imaging system may also include other numbers of lenses. Again, for example, although the first to sixth positioning elements are described as an example in the embodiment, the imaging system is not limited to including the first to sixth positioning elements. If necessary, the imaging system may also include other numbers of positioning elements.

[0063] The following further describes specific embodiments of the imaging system applicable to the above-mentioned embodiments with reference to the accompanying drawings.

[0064] Example 1

[0065] The following refers to Figures 2 to 9 Describe the imaging system according to Embodiment 1 of the present application. Figure 2A schematic diagram of the lens group included in the imaging system according to Embodiment 1 of this application is shown, and Figure 3 , Figure 4 , Figure 5 The diagrams show the structure of the camera system according to Embodiment 1 of this application under three different implementations.

[0066] Combination Figures 2 to 5 The camera system includes a lens barrel P0 and six lenses arranged sequentially along the optical axis from the object side to the image side, which are mounted in the lens barrel P0: 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.

[0067] The first lens E1 has positive power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has positive power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has negative power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has positive power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative power, with its object-side surface S11 being concave and its image-side surface S12 being concave.

[0068] In this embodiment, the camera system further includes a filter E7 located on the image side of the sixth lens E6, the filter E7 having an object side surface S13 and an image side surface S14. The camera system also includes an imaging surface S15, on which light from the object can sequentially pass through each surface S1 to S14 and ultimately be imaged.

[0069] Table 1 shows the basic parameters of the camera system of Example 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0070]

[0071]

[0072] Table 1

[0073] In Example 1, the object-side surface and image-side surface of any one of the first lens E1 to the sixth lens E6 are aspherical, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0074]

[0075] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Tables 2-1 and 2-2 below give the higher-order coefficients A4, A6, A8, A14, A15, A16, A17, A18, A19 ... 10 A 12 A 14 A 16 A 18 and A 20 .

[0076] Face number A4 A6 A8 A10 A12 S1 1.5007E-03 1.3884E-02 -1.2794E-01 5.9915E-01 -1.6371E+00 S2 -4.1546E-02 8.4231E-02 -6.4838E-01 3.0355E+00 -8.7291E+00 S3 -3.9923E-03 6.4190E-02 4.5743E-01 -2.9355E+00 9.9742E+00 S4 -2.1013E-02 4.8316E-01 -2.6605E+00 1.3907E+01 -4.8106E+01 S5 -1.7821E-01 3.0020E-01 -1.3462E+00 4.1648E+00 -9.8850E+00 S6 -1.7974E-01 3.9437E-01 -2.0880E+00 8.2117E+00 -2.2657E+01 S7 -1.8954E-01 8.4694E-02 6.4581E-01 -3.3352E+00 8.9834E+00 S8 -1.7666E-01 1.1677E-01 6.4821E-02 -3.2024E-01 5.7847E-01 S9 -9.4319E-02 -3.2186E-02 1.3627E-02 1.2095E-02 -2.6658E-02 S10 -1.3508E-02 -5.2810E-02 3.4111E-02 -1.4113E-02 3.4383E-03 S11 -6.1051E-02 4.0456E-02 -1.6401E-02 4.1212E-03 -6.4709E-04 S12 -5.0821E-02 1.7595E-02 -2.6890E-03 -1.0080E-04 1.0441E-04

[0077] Table 2-1

[0078]

[0079]

[0080] Table 2-2

[0081] Figure 3 , Figure 4 and Figure 5 The diagrams show the structural schematics of the camera system under three different implementations: Embodiment 1-1, 1-2, and 1-3. Figures 3 to 5 It can be seen that the camera system may also include multiple positioning elements housed in the lens barrel P0.

[0082] Specifically, in embodiments 1-1, 1-2, and 1-3, the plurality of positioning elements include: a first positioning element P1 located between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second positioning element P2 located between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third positioning element P3 located between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; a fourth positioning element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4; a fifth positioning element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth lens E5; and a sixth positioning element P6 located on the image side of the sixth lens E6 and in contact with the image side of the sixth lens E6.

[0083] The relevant parameter values ​​in Examples 1-1, 1-2, and 1-3 are shown in Table 7, respectively. Figures 3 to 5 as well as Figure 1Wherein, d1s is the inner diameter of the object-side surface of the first positioning element P1; D1m is the outer diameter of the image-side surface of the first positioning element P1; d2s is the inner diameter of the object-side surface of the second positioning element P2; d3s is the inner diameter of the object-side surface of the third positioning element P3; d4s is the inner diameter of the object-side surface of the fourth positioning element P4; d5s is the inner diameter of the object-side surface of the fifth positioning element P5; d5m is the inner diameter of the image-side surface of the fifth positioning element P5; EP01 is the distance along the optical axis from the object-side end face of the lens barrel P0 to the object-side surface of the first positioning element P1; CP1 is the first positioning element... The maximum thickness of component P1 along the optical axis; EP12 is the distance along the optical axis from the image-side surface of the first positioning element P1 to the object-side surface of the second positioning element P2; EP34 is the distance along the optical axis from the image-side surface of the third positioning element P3 to the object-side surface of the fourth positioning element P4; EP45 is the distance along the optical axis from the image-side surface of the fourth positioning element P4 to the object-side surface of the fifth positioning element P5; CP5 is the maximum thickness along the optical axis of the fifth positioning element P5; and EP56 is the distance along the optical axis from the image-side surface of the fifth positioning element P5 to the object-side surface of the sixth positioning element P6. All parameters shown in Table 7 are in millimeters (mm).

[0084] Figure 6 An on-axis chromatic aberration curve of the camera system of Embodiment 1 is shown, which represents the deviation of the convergence focal point of light of different wavelengths after passing through the lens. Figure 7 The astigmatism curves of the camera system of Embodiment 1 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 8 The distortion curve of the camera system of Embodiment 1 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 9 The magnification chromatic aberration curve of the imaging system of Embodiment 1 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 6 to 9 It can be seen that the camera system given in Example 1 can achieve good imaging quality.

[0085] Example 2

[0086] The following is for reference Figures 10 to 17 A camera system according to Embodiment 2 of this application is described. In this embodiment and the following embodiments, for the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted. Figure 10 A schematic diagram of the lens group included in the imaging system according to Embodiment 2 of this application is shown, and Figure 11 , Figure 12 , Figure 13 Schematic diagrams of the camera system according to Embodiment 2 of this application are shown in three different implementations.

[0087] Combination Figures 10 to 13The camera system includes a lens barrel P0 and six lenses arranged sequentially along the optical axis from the object side to the image side, which are mounted in the lens barrel P0: 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.

[0088] The first lens E1 has positive power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has negative power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has positive power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative power, with its object-side surface S11 being concave and its image-side surface S12 being concave.

[0089] In this embodiment, the camera system further includes a filter E7 located on the image side of the sixth lens E6, the filter E7 having an object side surface S13 and an image side surface S14. The camera system also includes an imaging surface S15, on which light from the object can sequentially pass through each surface S1 to S14 and ultimately be imaged.

[0090] Table 3 shows the basic parameters of the camera system in Example 2, where the units for radius of curvature and thickness / distance are millimeters (mm). Tables 4-1 and 4-2 show the higher-order coefficients A4, A6, A8, and A6 that can be used for the aspherical mirrors S1 to S12 in Example 2. 10 A 12 A 14 A 16 A 18 and A 20 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0091]

[0092] Table 3

[0093] Face number A4 A6 A8 A10 A12 S1 -5.5703E-05 -1.2660E-03 3.6996E-02 -2.3384E-01 6.9060E-01 S2 -4.8118E-02 1.9078E-02 -3.7165E-02 4.0617E-02 1.2430E-01 S3 -2.2944E-02 2.4814E-02 7.0822E-01 -3.3224E+00 8.8465E+00 S4 -6.5870E-03 3.2390E-01 -1.1218E+00 4.2739E+00 -9.1139E+00 S5 -1.7047E-01 7.2311E-02 7.7412E-01 -6.6339E+00 2.5504E+01 S6 -1.7682E-01 2.7783E-01 -1.2821E+00 4.5726E+00 -1.1475E+01 S7 -1.4362E-01 -1.0487E-01 1.0833E+00 -3.9909E+00 8.5040E+00 S8 -1.3284E-01 2.3163E-02 2.0033E-01 -5.0040E-01 7.0563E-01 S9 -9.3150E-02 -1.4065E-02 -4.8431E-03 1.4990E-02 -1.1364E-02 S10 -2.6122E-02 -3.2215E-02 1.4372E-02 -1.1582E-03 -2.0443E-03 S11 -6.3308E-02 4.3611E-02 -1.8363E-02 4.7596E-03 -7.6694E-04 S12 -4.6310E-02 9.4982E-03 2.7221E-03 -1.9649E-03 4.7524E-04

[0094] Table 4-1

[0095]

[0096]

[0097] Table 4-2

[0098] Figure 11 , Figure 12 and Figure 13The diagrams show the structural schematics of the camera system under three different implementations: Embodiment 2-1, 2-2, and 2-3. Figures 11 to 13 It can be seen that the camera system may also include multiple positioning elements housed in the lens barrel P0.

[0099] Specifically, in embodiments 2-1, 2-2, and 2-3, the plurality of positioning elements include: a first positioning element P1 located between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second positioning element P2 located between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third positioning element P3 located between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; a fourth positioning element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4; a fifth positioning element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth lens E5; and a sixth positioning element P6 located on the image side of the sixth lens E6 and in contact with the image side of the sixth lens E6.

[0100] The relevant parameter values ​​in Examples 2-1, 2-2 and 2-3 are shown in Table 7. The meaning of each parameter is as described above and will not be repeated here. The unit of each parameter in Table 7 is millimeters (mm).

[0101] Figure 14 The on-axis chromatic aberration curve of the camera system of Embodiment 2 is shown, which represents the deviation of the convergence focal point of light of different wavelengths after passing through the lens. Figure 15 The astigmatism curves of the camera system of Embodiment 2 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 16 The distortion curve of the camera system in Embodiment 2 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 17 The magnification chromatic aberration curve of the camera system of Embodiment 2 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 14 to 17 It can be seen that the camera system given in Example 2 can achieve good imaging quality.

[0102] Example 3

[0103] The following is for reference Figures 18 to 25 A camera system according to Embodiment 3 of this application is described. Figure 18 A schematic diagram of the lens group included in the imaging system according to Embodiment 3 of this application is shown, and Figure 19 , Figure 20 , Figure 21 Schematic diagrams of the camera system according to Embodiment 3 of this application are shown in three different implementations.

[0104] Combination Figures 18 to 21 The camera system includes a lens barrel P0 and six lenses arranged sequentially along the optical axis from the object side to the image side, which are mounted in the lens barrel P0: 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.

[0105] The first lens, E1, has positive power; its object-side surface, S1, is convex, and its image-side surface, S2, is concave. The second lens, E2, has negative power; its object-side surface, S3, is convex, and its image-side surface, S4, is concave. The third lens, E3, has negative power; its object-side surface, S5, is convex, and its image-side surface, S6, is convex. The fourth lens, E4, has positive power; its object-side surface, S7, is concave, and its image-side surface, S8, is convex. The fifth lens, E5, has positive power; its object-side surface, S9, is concave, and its image-side surface, S10, is convex. The sixth lens, E6, has negative power; its object-side surface, S11, is concave, and its image-side surface, S12, is concave.

[0106] In this embodiment, the camera system also includes an imaging surface S13 located on the image side of the sixth lens E6, where light from the object can pass sequentially through each surface S1 to S12 and finally be imaged onto the imaging surface S13.

[0107] Table 5 shows the basic parameters of the camera system in Example 3, where the units for radius of curvature and thickness / distance are millimeters (mm). Tables 6-1 and 6-2 show the higher-order coefficients A4, A6, A8, and A6 that can be used for the aspherical mirrors S1 to S12 in Example 3. 10 A 12 A 14 A 16 A 18 and A 20 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0108]

[0109] Table 5

[0110] Face number A4 A6 A8 A10 A12 S1 -1.1404E-02 -8.3971E-02 7.0528E-01 -4.9061E+00 2.0551E+01 S2 -1.9290E-01 1.1415E+00 -2.8315E+00 1.0000E+00 1.8667E+01 S3 -2.6675E-01 2.1219E+00 -5.4296E+00 -3.0990E+00 7.6892E+01 S4 -1.1968E-01 1.3441E+00 -5.8432E+00 2.0162E+01 -6.4897E+01 S5 -4.0895E-02 -7.9121E-02 3.5247E+00 -3.3386E+01 1.7435E+02 S6 -3.8241E-01 1.2066E+00 -6.7543E+00 3.2319E+01 -1.1304E+02 S7 -5.3858E-01 1.3445E+00 -8.9989E+00 4.8737E+01 -1.8278E+02 S8 -1.9767E-01 1.9142E-01 -1.2078E+00 5.2071E+00 -1.3928E+01 S9 1.4617E-03 7.5620E-02 -7.4028E-01 3.4241E+00 -8.5197E+00 S10 2.2176E-02 -1.8330E-02 5.7198E-02 1.5074E-02 2.6310E-02 S11 2.0434E-01 -3.9631E-01 4.4969E-01 -3.2107E-01 1.4823E-01 S12 1.2889E-01 -2.5813E-01 2.3419E-01 -1.3091E-01 4.7024E-02

[0111] Table 6-1

[0112]

[0113]

[0114] Table 6-2

[0115] Figure 19 , Figure 20 and Figure 21The diagrams show the structural schematics of the camera system under three different implementations: Embodiment 3-1, 3-2, and 3-3. Figures 19 to 21 It can be seen that the camera system may also include multiple positioning elements housed in the lens barrel P0.

[0116] Specifically, in embodiments 3-1, 3-2, and 3-3, the plurality of positioning elements include: a first positioning element P1 located between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second positioning element P2 located between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third positioning element P3 located between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; a fourth positioning element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4; a fifth positioning element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image side of the fifth lens E5; and a sixth positioning element P6 located on the image side of the sixth lens E6 and in contact with the image side of the sixth lens E6.

[0117] The relevant parameter values ​​in Examples 3-1, 3-2 and 3-3 are shown in Table 7. The meaning of each parameter is as described above and will not be repeated here. The unit of each parameter in Table 7 is millimeters (mm).

[0118] Figure 22 The on-axis chromatic aberration curve of the camera system of Embodiment 3 is shown, which represents the deviation of the convergence focal point of light of different wavelengths after passing through the lens. Figure 23 The astigmatism curves of the camera system of Embodiment 3 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 24 The distortion curve of the camera system in Embodiment 3 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 25 The magnification chromatic aberration curve of the camera system of Embodiment 3 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 22 to 25 As can be seen, the camera system given in Example 3 can achieve good imaging quality.

[0119] Parameters / Examples 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 d1s 1.6734 1.6734 1.7059 2.0230 2.0230 2.0109 1.4918 1.4918 1.4918 D1m 3.9396 2.8386 4.5024 4.2482 4.2482 2.9764 3.6391 3.3993 3.0182 d2s 1.5852 1.5852 1.5852 1.6967 1.6967 1.6967 1.3838 1.3838 1.3838 d3s 1.8400 1.8400 1.8400 1.9472 1.9472 1.9472 1.4596 1.4596 1.4596 d4s 2.7070 2.7070 2.7070 3.1006 3.1006 3.1006 1.8499 1.8499 1.8499 d5s 4.3811 4.8433 4.3811 4.8023 4.9139 4.6957 2.5164 2.5164 2.5164 d5m 6.6107 6.6107 6.6107 6.4541 6.4541 6.4541 2.5604 2.5604 2.5604 EP01 0.6355 0.6355 0.6026 0.5685 0.5685 0.5763 0.4693 0.4693 0.4693 CP1 0.0220 0.0220 0.0220 0.0220 0.0220 0.0220 0.0220 0.0220 0.0220 EP12 0.3441 0.3441 0.3770 0.4111 0.4111 0.4033 0.2698 0.2698 0.2698 EP34 0.4254 0.4254 0.4254 0.4363 0.4254 0.4254 0.4036 0.4036 0.4036 EP45 0.3550 0.4550 0.3550 0.3550 0.3550 0.3550 0.3868 0.3868 0.3868 CP5 0.8305 0.7305 0.8305 0.6252 0.5827 0.6252 0.0220 0.0220 0.0220 EP56 0.1917 0.1915 0.1917 0.1955 0.2381 0.1955 0.8263 0.8263 0.7437

[0120] Table 7

[0121] Furthermore, in Examples 1 to 3, the effective focal length values ​​f1 to f6 of each lens, the effective focal length f of the camera system, and the maximum field of view (FOV) of the camera system are shown in Table 8.

[0122]

[0123]

[0124] Table 8

[0125] Examples 1 to 3 respectively satisfy the conditions shown in Table 9.

[0126]

[0127] Table 9

[0128] This application also provides an imaging device equipped with an electronic photosensitive element for imaging. The electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) device. The imaging device can be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. This imaging device is equipped with the camera system described above.

[0129] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of protection involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the concept of this application. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A camera system, comprising a lens barrel, a lens assembly housed within the lens barrel, and a plurality of positioning elements, characterized in that, The inner circumferential surface of the lens barrel has at least two steps; The lens group comprises lenses arranged sequentially along the optical axis from the object side to the image side: The first lens with positive optical power has a convex object side and a concave image side. The second lens has negative optical power and its image side is concave. The object side of the third lens is convex; The object side of the fourth lens is concave, and the image side is convex. A fifth lens with positive optical power; and The sixth lens has negative optical power, with both the object side and the image side being concave. The third lens has the opposite positive and negative optical power properties to the fourth lens; Furthermore, among the third to the sixth lenses, the sixth lens has the smallest absolute value of its effective focal length; The number of lenses with optical power in the camera system is six; The plurality of positioning elements include: a fourth positioning element located on the image side of the fourth lens and in contact with the image side of the fourth lens; a fifth positioning element located on the image side of the fifth lens and in contact with the image side of the fifth lens; and a sixth positioning element located on the image side of the sixth lens and in contact with the image side of the sixth lens. The camera system satisfies: -18.56≤f6 / (CP5+EP56-CT5)≤-5.79, 5.49≤(R9-R8) / d4s≤8.26, 2.37≤f5 / ((d5s+d5m) / 2)≤4.04; Wherein, f6 is the effective focal length of the sixth lens, CP5 is the maximum thickness of the fifth positioning element along the optical axis, EP56 is the distance from the image side of the fifth positioning element to the object side of the sixth positioning element along the optical axis, CT5 is the center thickness of the fifth lens on the optical axis, R8 is the radius of curvature of the image side of the fourth lens, R9 is the radius of curvature of the object side of the fifth lens, d4s is the inner diameter of the object side of the fourth positioning element, f5 is the effective focal length of the fifth lens, d5s is the inner diameter of the object side of the fifth positioning element, and d5m is the inner diameter of the image side of the fifth positioning element.

2. The camera system according to claim 1, characterized in that, The plurality of positioning elements further includes: a first positioning element, located on the image side of the first lens and in contact with the image side of the first lens; The radius of curvature R2 of the image side surface of the first lens, the radius of curvature R1 of the object side surface of the first lens, the distance EP01 from the object side end face of the lens barrel to the object side surface of the first positioning element along the optical axis, and the center thickness CT1 of the first lens on the optical axis satisfy the following: 3.26≤(R2 / R1)×(EP01 / CT1)≤10.

33.

3. The camera system according to claim 1, characterized in that, The plurality of positioning elements further includes: a third positioning element, located on the image side of the third lens and in contact with the image side of the third lens; The radius of curvature R7 of the object side surface of the fourth lens, the radius of curvature R8 of the image side surface of the fourth lens, the distance EP34 from the image side surface of the third positioning element to the object side surface of the fourth positioning element along the optical axis, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy the following: 1.81≤|R7 / R8|×(EP34 / T34)≤7.

01.

4. The camera system according to claim 2, characterized in that, The plurality of positioning elements further includes: a second positioning element, located on the image side of the second lens and in contact with the image side of the second lens; The effective focal length f2 of the second lens, the effective focal length f1 of the first lens, the outer diameter D1m of the image side of the first positioning element, and the inner diameter d2s of the object side of the second positioning element satisfy the following: -4.68≤(f2 / f1)×((D1m-d2s) / d2s)≤-1.

61.

5. The camera system according to claim 4, characterized in that, The plurality of positioning elements further includes: a third positioning element, located on the image side of the third lens and in contact with the image side of the third lens; The aperture coefficient Fno of the imaging system, the inner diameter d2s of the object-side surface of the second positioning element, the inner diameter d1s of the object-side surface of the first positioning element, and the inner diameter d3s of the object-side surface of the third positioning element satisfy the following: 0.87≤Fno×(d2s-d1s) / (d2s-d3s)≤3.

15.

6. The camera system according to claim 2, characterized in that, The entrance pupil diameter EPD of the imaging system, the distance EP01 from the object-side end face of the lens barrel to the object-side surface of the first positioning element along the optical axis, the maximum thickness CP1 of the first positioning element along the optical axis, and the air gap T12 between the first lens and the second lens on the optical axis satisfy the following: 3.43≤EPD / (EP01+CP1-T12)≤4.

60.

7. The camera system according to claim 1, characterized in that, In the first to the sixth lenses, the Abbe number of the i-th lens is less than 30, the i-th positioning element is a positioning element located on the image side of the i-th lens and in contact with the image side surface of the i-th lens, and the (i-1)-th positioning element is a positioning element located on the image side of the (i-1)-th lens and in contact with the image side surface of the (i-1)-th lens. The effective focal length fi of the i-th lens, the Abbe number Vi of the i-th lens, and the distance EP from the image side of the (i-1)-th positioning element to the object side of the i-th positioning element along the optical axis. (i-1)i satisfy: 0.42≤|fi / Vi| / EP (i-1)i ≤23.70, where i is taken from 2, 4, or 5.

8. The camera system according to claim 1, characterized in that, The center thickness CT6 of the sixth lens on the optical axis, the air gap T56 between the fifth and sixth lenses on the optical axis, and the refractive index N5 of the fifth lens satisfy the following: 0.95≤(CP5+EP56+CT6) / (T56×(N5-1))≤2.

5.

9. The camera system according to claim 2, characterized in that, The effective focal length f1 of the first lens, the outer diameter D1m of the image side of the first positioning element, and the inner diameter d1s of the object side of the first positioning element satisfy the following: 1.68mm≤f1 / ((D1m-d1s) / d1s)≤6.57mm.

10. The camera system according to claim 4, characterized in that, The radius of curvature R3 of the object side surface of the second lens, the radius of curvature R4 of the image side surface of the second lens, and the distance EP12 from the image side surface of the first positioning element to the object side surface of the second positioning element along the optical axis satisfy the following: 39.31≤|R3+R4| / EP12≤52.

49.

11. The camera system according to any one of claims 1 to 10, characterized in that, Among any two adjacent lenses from the first lens to the sixth lens, the air gap on the optical axis is the largest between the fifth lens and the sixth lens.

12. The camera system according to any one of claims 1 to 10, characterized in that, The effective focal length of the first lens is less than the absolute value of the effective focal length of the sixth lens.

Images