Imaging lens system
By designing a seven-lens imaging lens system that meets specific conditional expressions, the problem of installing high-resolution and wide-field systems in vehicle cameras is solved, and high-efficiency imaging in limited space is achieved.
Patent Information
- Application Number
- CN202510294225.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2021-12-07
- Filing Date
- 2022-06-23
- Publication Date
- 2025-04-22
AI Technical Summary
It is difficult to install an imaging lens system with high resolution and wide field of view in a vehicle camera, due to the installation space and structural design of vehicle components.
An imaging lens system was designed that consists of seven lenses whose focal length and radius of curvature are optimized to meet specific conditional expressions such as f5/f6 < -1.0, f1/f4 < -2.4 and 190° ≤ HFOV, ensuring the system has a low f-number and wide field of view.
It realizes the installation of an imaging lens system with high resolution and wide field of view in a limited installation space to meet the needs of vehicle cameras for object recognition and information provision.
Smart Images
Figure CN119861471A_ABST
Abstract
Description
[0001] CROSS-REFERENCE TO RELATED APPLICATIONS
[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2021-0173554 filed in the Korean Patent Office on December 7, 2021, the disclosure of which is incorporated herein by reference in its entirety for all purposes. Technical Field
[0003] The present application relates to an imaging lens system that can be mounted on a camera that requires a wide field of view. Background Art
[0004] Recently produced vehicles include cameras to significantly reduce damage to people and property caused by traffic accidents. For example, one or more cameras may be mounted on the rear bumper of the front bumper of the vehicle to provide the driver with information about objects located on the front and rear sides of the vehicle. Because it is important for a vehicle camera to accurately identify objects around the vehicle and provide the driver with information about the identified objects, an imaging lens system with high resolution and a wide field of view is required. However, limited installation space may make it difficult to install an imaging lens system with high resolution and a wide field of view in a vehicle camera. For example, the frontmost lens and another lens should be manufactured to have a large diameter to achieve a vehicle camera with a low f-number. However, due to the structural and design limitations of the vehicle components (such as the bumper) on which the camera is mounted, it is difficult to arbitrarily increase the size of the lens.
[0005] The above information is presented as background information only to assist in understanding the disclosure of the present application. No determination has been made, and no assertion is made, as to whether any of the above information is applicable as prior art with respect to the disclosure of the present application. Summary of the invention
[0006] This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
[0007] In one general aspect, an imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in ascending order along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. The second lens has a concave object surface in its paraxial region, and the imaging lens system satisfies the conditional expressions f5 / f6 < -1.0, f1 / f4 < -2.4, and 190° ≤ HFOV, where f is the focal length of the imaging lens system, f1 is the focal length of the first lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and HFOV is the horizontal field of view of the imaging lens system.
[0008] The third lens may have a convex object surface in its paraxial region.
[0009] The third lens may have a convex image surface in its paraxial region.
[0010] The fifth lens may have a concave object surface in its paraxial region.
[0011] The seventh lens may have a concave object surface in its paraxial region.
[0012] The seventh lens may have a convex image surface in its paraxial region.
[0013] The imaging lens system may also satisfy the conditional expression 0.03 mm / ° < L1ER1 / HFOV < 0.06 mm / ° , where L1ER1 is the effective radius of the object surface of the first lens.
[0014] The imaging lens system may also satisfy the conditional expression 0.10 < ImgHT / TTL < 0.20, where ImgHT is the maximum effective image height on the imaging surface, and TTL is the distance along the optical axis from the object surface of the first lens to the imaging surface.
[0015] The imaging lens system may also satisfy the conditional expression 0.80 < D12 / D23 < 1.60, where D12 is the distance along the optical axis from the image surface of the first lens to the object surface of the second lens, and D23 is the distance along the optical axis from the image surface of the second lens to the object surface of the third lens.
[0016] The imaging lens system may also satisfy the conditional expression 4.0 < (R8 + R11) / T5 < 8.0, where R8 is the radius of curvature of the image surface of the fourth lens at the optical axis, R11 is the radius of curvature of the object surface of the sixth lens at the optical axis, and T5 is the thickness of the fifth lens along the optical axis.
[0017] In another general aspect, an imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in ascending order along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system, wherein the imaging lens system satisfies the conditional expression 90° ≤ HFOV and 8.0° / mm < HFOV / TTL < 12.0° / mm, where HFOV is the horizontal field of view of the imaging lens system, and TTL is the distance along the optical axis from the object side surface of the first lens to the imaging surface.
[0018] The second lens may have a concave object side surface in its paraxial region.
[0019] The seventh lens may have a convex image side surface in its paraxial region.
[0020] The imaging lens system may also satisfy the conditional expression 20 < |R3 / T2| < 60, where R3 is the radius of curvature of the object side surface of the second lens at the optical axis, and T2 is the thickness of the second lens along the optical axis.
[0021] The imaging lens system may also satisfy the conditional expression 46 < |(R9 + R10) / T5| < 136, where R9 is the radius of curvature of the object side surface of the fifth lens at the optical axis, R10 is the radius of curvature of the image side surface of the fifth lens at the optical axis, and T5 is the thickness of the fifth lens along the optical axis.
[0022] The imaging lens system may also satisfy the conditional expression 0.6 < |(R11 + R12) / T6| < 1.6, where R11 is the radius of curvature of the object side surface of the sixth lens at the optical axis, R12 is the radius of curvature of the image side surface of the sixth lens at the optical axis, and T6 is the thickness of the sixth lens along the optical axis.
[0023] Other features and aspects will be apparent from the following detailed description, the accompanying drawings, and the claims. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 is a diagram of an imaging lens system according to a first embodiment.
[0025] Figure 2 shows Figure 1 the aberration curves of the imaging lens system shown.
[0026] Figure 3 is a diagram of an imaging lens system according to a second embodiment.
[0027] Figure 4 shows Figure 3 the aberration curves of the imaging lens system shown.
[0028] Figure 5 is a diagram of an imaging lens system according to a third embodiment.
[0029] Figure 6 Shows Figure 5 Aberration curves of the imaging lens system shown.
[0030] Figure 7 is a diagram of an imaging lens system according to a fourth embodiment.
[0031] Figure 8 Shows Figure 7 Aberration curves of the imaging lens system shown.
[0032] Fig. 9 is a diagram of an imaging lens system according to a fifth embodiment.
[0033] Fig.10 Shows Fig. 9 Aberration curves of the imaging lens system shown.
[0034] Fig.11 is a diagram of an imaging lens system according to a sixth embodiment.
[0035] Fig.12 Shows Fig.11 Aberration curves of the imaging lens system shown.
[0036] Fig.13 is a diagram of an imaging lens system according to a seventh embodiment.
[0037] Fig.14 Shows Fig.13 Aberration curves of the imaging lens system shown.
[0038] Fig.15 is a diagram of an imaging lens system according to an eighth embodiment.
[0039] Fig.16 Shows Fig.15 Aberration curves of the imaging lens system shown.
[0040] Fig.17 is a diagram of an imaging lens system according to a ninth embodiment.
[0041] Fig.18 Shows Fig.17 Aberration curves of the imaging lens system shown.
[0042] Fig.19 is a diagram of an imaging lens system according to a tenth embodiment.
[0043] Fig. 20 Shows Fig.19 Aberration curves of the imaging lens system shown.
[0044] In all drawings and detailed description, the same reference numerals refer to the same elements. The drawings may not be drawn to scale, and the relative sizes, proportions, and depictions of elements in the drawings may be exaggerated for clarity, illustration, and convenience. DETAILED DESCRIPTION
[0045] The following specific embodiments are provided to help the reader fully understand the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the sequence of operations described herein is merely an example and is not limited to the sequence of operations set forth herein, but can be obviously changed after understanding the disclosure of the present application, except for the operations that must occur in a specific order. In addition, in order to improve clarity and simplicity, the description of functions and structures known in the art may be omitted.
[0046] The features described herein can be implemented in different forms and should not be interpreted as being limited to the examples described herein. Instead, the examples described herein are provided only to illustrate some of the many possible ways that will be apparent after understanding the disclosure of the present application to implement the methods, devices and / or systems described herein.
[0047] The use of the term “may” herein when describing various examples, for example, with respect to what an example may include or implement, means that there is at least one example in which such feature is included or implemented, but not all examples are limited thereto.
[0048] Throughout the specification, when an element such as a layer, a region, or a substrate is described as being “on,” “connected to,” or “coupled to” another element, it may be directly “on,” “connected to,” or “coupled to” the other element, or one or more other elements may be present between them. Conversely, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, there are no other elements present between them.
[0049] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more.
[0050] Although terms such as "first", "second", and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Instead, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, first component, first region, first layer, or first portion mentioned in the examples may also be referred to as the second member, second component, second region, second layer, or second portion.
[0051] For ease of description, spatially relative terms such as "above", "higher", "lower" and "lower" may be used herein to describe the relationship between one element and another element as shown in the accompanying drawings. In addition to the orientation depicted in the accompanying drawings, such spatially relative terms are intended to also include different orientations of the device in use or operation. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "higher" relative to another element will be "below" or "lower" relative to another element. Therefore, the term "above" includes both upper and lower orientations, depending on the spatial orientation of the device. The device may also be oriented in other ways (e.g., rotated 90° or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.
[0052] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. The articles "a", "an" and "the" are intended to include plural forms as well, unless the context clearly indicates otherwise. The terms "include", "comprise" and "have" represent the presence of stated features, numbers, operations, components, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, numbers, operations, components, elements and / or combinations thereof.
[0053] Due to manufacturing techniques and / or tolerances, the shapes shown in the drawings may vary. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include changes in shapes that occur during manufacturing.
[0054] The features of the examples described herein can be combined in various ways, which will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have multiple configurations, other configurations are also possible after understanding the disclosure of the present application.
[0055] In the drawings, for ease of explanation, the thickness, size and shape of the lens may be slightly exaggerated. Specifically, the shapes of the spherical surface or aspherical surface shown in the drawings are shown by way of example. That is, the shapes of the spherical surface or aspherical surface are not limited to those shown in the drawings.
[0056] In the embodiments described herein, the first lens refers to a lens closest to an object (or subject), and the seventh lens refers to a lens closest to an imaging plane (or image sensor).
[0057] The units of the radius of curvature of the lens surface, the thickness of lenses and other optical elements, the gaps between lenses and other optical elements, TTL (the distance from the object side surface of the first lens to the imaging plane), BFL (the distance from the image side surface of the seventh lens to the imaging plane), ImgHT (the maximum effective image height on the imaging plane, which is equal to half the diagonal length of the effective imaging area of the imaging plane), focal length, and the effective radius of the surfaces of lenses and other optical elements are expressed in millimeters (mm).
[0058] The thickness of lenses and other optical elements, the gaps between lenses and other optical elements, TTL and BFL are measured along the optical axis of the imaging lens system. The radius of curvature of the lens surface is measured at the optical axis.
[0059] Unless otherwise stated, references to the shape of a lens surface refer to the shape of a paraxial region of the lens surface. The paraxial region of the lens surface is the central portion of the lens surface that surrounds and includes the optical axis of the lens surface, in which light rays incident on the lens surface form a small angle θ with the optical axis, and the approximations sinθ≈θ, tanθ≈θ, and cosθ≈1 are valid.
[0060] For example, a statement that the object side surface of a lens is convex means that at least the paraxial region of the object side surface of the lens is convex, and a statement that the image side surface of the lens is concave means that at least the paraxial region of the image side surface of the lens is concave. Therefore, even if the object side surface of a lens can be described as convex, the entire object side surface of the lens may not be convex, and the peripheral region of the object side surface of the lens may be concave. Moreover, even if the image side surface of a lens can be described as concave, the entire image side surface of the lens may not be concave, and the peripheral region of the image side surface of the lens may be convex.
[0061] The effective aperture radius or effective radius of the lens surface is the radius of the portion of the lens surface through which light actually passes, and is not necessarily the radius of the outer edge of the lens surface. In other words, the effective aperture radius or effective radius of the lens surface is the distance between the optical axis and the marginal ray of light passing through the lens surface in a direction perpendicular to the optical axis of the lens surface. The object side of the lens and the image side of the lens may have different effective aperture radii or effective radii.
[0062] The imaging lens system described herein may be configured to be mounted on a transport device. For example, the imaging lens system may be mounted on a front or rear surveillance camera or an autonomous driving camera mounted on a bus, a truck, a van, a fire truck, a forklift, or other transport device. However, the scope of use and examples of the imaging lens system described herein are not limited to the above examples. For example, the imaging lens system may be mounted on an imaging camera of a surveillance drone or a transport drone.
[0063] The imaging lens system according to the first embodiment may include a plurality of lenses. For example, the imaging lens system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in ascending order from the object side of the imaging lens system toward the imaging surface of the imaging lens system along the optical axis of the imaging lens system. The imaging lens system according to the first embodiment may include a lens having a concave object side surface. For example, in the imaging lens system according to the first embodiment, the second lens may have a concave object side surface.
[0064] The imaging lens system according to the first embodiment may satisfy one or more conditional expressions. As an example, the imaging lens system according to the first embodiment may satisfy all of the following conditional expressions regarding the focal length f of the imaging lens system, the focal length f1 of the first lens, the focal length f4 of the fourth lens, the focal length f5 of the fifth lens, and the horizontal field of view HFOV of the imaging lens system.
[0065] f5 / f6<-1.0 (conditional expression 1)
[0066] f1 / f4<-2.4 (conditional expression 2)
[0067] 190°≤HFOV (Conditional Expression 3)
[0068] The imaging lens system according to the second embodiment may include a plurality of lenses. For example, the imaging lens system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in ascending order from the object side of the imaging lens system toward the imaging surface of the imaging lens system along the optical axis of the imaging lens system.
[0069] The imaging lens system according to the second embodiment may satisfy one or more conditional expressions. As an example, the imaging lens system according to the second embodiment may satisfy all of the following conditional expressions regarding the horizontal field of view HFOV of the imaging lens system and the length TTL of the imaging lens system (i.e., the distance from the object side surface of the first lens to the imaging surface).
[0070] 190°≤HFOV (Conditional Expression 3)
[0071] 8.0° / mm < HFOV / TTL < 12.0° / mm (Conditional Expression 4)
[0072] The imaging lens system according to the third embodiment can be configured to satisfy one or more of the following conditional expressions. As an example, the imaging lens system according to the third embodiment can include seven lenses and can satisfy two or more of the following conditional expressions. As another example, the imaging lens system according to the third embodiment can include seven lenses and can be configured to satisfy all of the following conditional expressions.
[0073] f1 / f < 0 (Conditional Expression 5)
[0074] f1 / f4 < -2.4 (Conditional Expression 2)
[0075] f5 / f6 < -1.0 (Conditional Expression 1)
[0076] 30 < |V6 - V5| (Conditional Expression 6)
[0077] 190° ≤ HFOV (Conditional Expression 3)
[0078] 0.03mm / ° < L1ER1 / HFOV < 0.06mm / ° (Conditional Expression 7)
[0079] 0.10 < ImgHT / TTL < 0.20 (Conditional Expression 8)
[0080] In the above conditional expressions, f is the focal length of the imaging lens system, f1 is the focal length of the first lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, V5 is the Abbe number of the fifth lens, V6 is the Abbe number of the sixth lens, HFOV is the horizontal field of view of the imaging lens system, L1ER1 is the effective radius of the object side surface of the first lens, ImgHT is the maximum effective image height on the imaging surface, and TTL is the distance from the object side surface of the first lens to the imaging surface.
[0081] The imaging lens system according to the third embodiment can satisfy some of the above-listed conditional expressions in a more restrictive manner listed below.
[0082] -8.0 < f1 / f < -4.0 (Conditional Expression 9)
[0083] -4.0 < f1 / f4 < -2.4 (Conditional Expression 10)
[0084] -3.0 < f5 / f6 < -1.0 (Conditional Expression 11)
[0085] 30 < |V6 - V5| < 40 (Conditional Expression 12)
[0086] 190° ≤ HFOV < 200° (Conditional Expression 13)
[0087] The imaging lens system according to the fourth embodiment can be configured to satisfy one or more of the following conditional expressions. For example, the imaging lens system according to the fourth embodiment can include seven lenses and can satisfy at least two of the following conditional expressions. As another example, the imaging lens system according to the fourth embodiment can include seven lenses and can be configured to satisfy all of the following conditional expressions.
[0088] 0.80 < D12 / D23 < 1.60 (Conditional Expression 14)
[0089] 20 < |R3 / T2| < 60 (Conditional Expression 15)
[0090] 4.0 < (R8 + R11) / T5 < 8.0 (Conditional Expression 16)
[0091] 46 < |(R9 + R10)| / T5 < 136 (Conditional Expression 17)
[0092] 0.6 < (R11 + R12) / T6 < 1.6 (Conditional Expression 18)
[0093] In the above conditional expressions, D12 is the distance from the image side of the first lens to the object side of the second lens, D23 is the distance from the image side of the second lens to the object side of the third lens, R3 is the radius of curvature of the object side of the second lens, T2 is the thickness of the second lens, 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, R10 is the radius of curvature of the image side of the fifth lens, R11 is the radius of curvature of the object side of the sixth lens, R12 is the radius of curvature of the image side of the sixth lens, T5 is the thickness of the fifth lens, and T6 is the thickness of the sixth lens.
[0094] The imaging lens system according to an embodiment can include one or more lenses having the characteristics described below. As an example, the imaging lens system according to the first embodiment can include one of the first lens to the seventh lens having the characteristics described below. As another example, the imaging lens systems according to the second to fourth embodiments can include one or more of the first lens to the seventh lens having the characteristics described below. However, the imaging lens system according to the above embodiments does not necessarily include lenses having the characteristics described below. Hereinafter, the first lens to the seventh lens will be described.
[0095] The first lens may have a refractive power. For example, the first lens may have a negative refractive power. The first lens may have a convex surface. For example, the first lens may have a convex object side surface. The first lens may include a spherical surface. As an example, both surfaces of the first lens may be spherical. The first lens may be formed of a material having high light transmittance and excellent processability. For example, the first lens may be formed of a plastic material or a glass material. The first lens may be configured to have a predetermined refractive index. For example, the refractive index of the first lens may be greater than 1.7. As a detailed example, the refractive index of the first lens may be greater than 1.74 and less than 1.84. The first lens may have a predetermined Abbe number. As an example, the Abbe number of the first lens may be 40 or greater. As a detailed example, the Abbe number of the first lens may be greater than 40 and less than 60.
[0096] The second lens may have a refractive power. For example, the second lens may have a negative refractive power. The second lens may have at least one concave surface. For example, the second lens may have a concave object side surface. The second lens includes an aspherical surface. For example, both surfaces of the second lens may be aspherical. The second lens may include an inflection point. For example, the inflection point may be formed on the object side surface of the second lens. The second lens may be formed of a material having high light transmittance and excellent processability. For example, the second lens may be formed of a plastic material or a glass material. The second lens may be configured to have a predetermined refractive index. For example, the refractive index of the second lens may be greater than 1.5. As a specific example, the refractive index of the second lens may be greater than 1.52 and less than 1.60. The second lens may have a predetermined Abbe number. For example, the Abbe number of the second lens may be 50 or more. As a specific example, the Abbe number of the second lens may be greater than 50 and less than 64.
[0097] The third lens may have a refractive power. For example, the third lens may have a positive refractive power. The third lens may have at least one convex surface. For example, the third lens may have a convex object side surface or a convex image side surface. The third lens may have an aspherical surface. As an example, both surfaces of the third lens may be aspherical. The third lens may be formed of a material having high light transmittance and excellent processability. As an example, the third lens may be formed of a plastic material or a glass material. The third lens may be configured to have a predetermined refractive index. For example, the refractive index of the third lens may be greater than 1.6 and less than 1.9. The third lens may have a predetermined Abbe number. For example, the Abbe number of the third lens may be greater than 20 and less than 30.
[0098] The fourth lens may have a refractive power. For example, the fourth lens may have a positive refractive power. The fourth lens may have at least one convex surface. For example, the fourth lens may have a convex image side surface. The fourth lens may have an aspherical surface. As an example, both surfaces of the fourth lens may be aspherical. The fourth lens may have an inflection point. As an example, the inflection point may be formed on the object side surface of the fourth lens. The fourth lens may be formed of a material having high light transmittance and excellent processability. For example, the fourth lens may be formed of a plastic material or a glass material. The fourth lens may be configured to have a predetermined refractive index. For example, the refractive index of the fourth lens may be greater than 1.46 and less than 1.56. The fourth lens may have a predetermined Abbe number. For example, the Abbe number of the fourth lens may be greater than 60 and less than 80.
[0099] The fifth lens may have a refractive power. For example, the fifth lens may have a negative refractive power. The fifth lens may have at least one concave surface. For example, the fifth lens may have a concave object side surface or a concave image side surface. The fifth lens may have an aspherical surface. As an example, both surfaces of the fifth lens may be aspherical. The fifth lens may include an inflection point. For example, the inflection point may be formed on the object side surface of the fifth lens. The fifth lens may be formed of a material having high light transmittance and excellent processability. For example, the fifth lens may be formed of a plastic material or a glass material. The fifth lens may be configured to have a predetermined refractive index. For example, the refractive index of the fifth lens may be greater than 1.6. As a detailed example, the refractive index of the fifth lens may be greater than 1.6 and less than 1.70. The fifth lens may have a predetermined Abbe number. For example, the Abbe number of the fifth lens may be 20 or more. As a detailed example, the Abbe number of the fifth lens may be greater than or equal to 20 and less than 30.
[0100] The sixth lens may have a refractive power. For example, the sixth lens may have a positive refractive power. The sixth lens may have at least one convex surface. For example, the sixth lens may have a convex image side surface. The sixth lens may have an aspherical surface. As an example, both surfaces of the sixth lens may be aspherical. The sixth lens may have an inflection point. For example, the inflection point may be formed on the image side surface of the sixth lens. The sixth lens may be formed of a material having high light transmittance and excellent processability. For example, the sixth lens may be formed of a plastic material or a glass material. The sixth lens may be configured to have a predetermined refractive index. For example, the refractive index of the sixth lens may be greater than 1.50 and less than 1.60. The sixth lens may have a predetermined Abbe number. For example, the Abbe number of the sixth lens may be greater than 50 and less than 60.
[0101] The seventh lens may have a refractive power. For example, the seventh lens may have a negative refractive power. The seventh lens may have a concave surface. As an example, the seventh lens may have a concave object side surface. The seventh lens may have a convex surface. As an example, the seventh lens may have a convex image side surface. The seventh lens has an aspherical surface. As an example, both surfaces of the seventh lens may be aspherical. The seventh lens may have an inflection point. For example, the inflection point may be formed on one or both of the object side surface and the image side surface of the seventh lens. The seventh lens may be formed of a material having high light transmittance and excellent processability. For example, the seventh lens may be formed of a plastic material or a glass material. The seventh lens may be configured to have a predetermined refractive index. For example, the refractive index of the seventh lens may be greater than 1.60 and less than 1.74. The seventh lens may have a predetermined Abbe number. For example, the Abbe number of the seventh lens may be greater than 16 and less than 30.
[0102] As described above, the first to seventh lenses may have spherical surfaces or aspherical surfaces.
[0103] The aspherical surface of the lens can be expressed by the following Equation 1.
[0104]
[0105] In Equation 1, c is the curvature of the lens surface and is equal to the inverse of the radius of curvature of the lens surface at the optical axis of the lens surface, k is the cone constant, r is the distance from any point on the lens surface to the optical axis of the lens surface in a direction perpendicular to the optical axis of the lens surface, A, B, C, D, E, F, G, H and J are aspheric constants, and Z (or sag) is the distance from a point on the lens surface at a distance r from the optical axis of the lens surface to a tangent plane perpendicular to the optical axis and intersecting the vertex of the lens surface in a direction parallel to the optical axis of the lens surface.
[0106] The imaging lens system according to the above-mentioned embodiment may further include an aperture, a filter and a cover glass. As an example, the imaging lens system may further include an aperture arranged between the third lens and the fourth lens. The aperture may be configured to adjust the amount of light incident on the imaging surface. As another example, the imaging lens system may further include an optical filter and a cover glass arranged between the seventh lens and the imaging surface. The optical filter may be configured to block light of a specific wavelength or a specific wavelength range, and the cover glass may be configured to block foreign matter from reaching the imaging surface. As an example, the optical filter may be configured to block infrared light, but may be additionally or alternatively configured to block ultraviolet light.
[0107] Figure 1 is a diagram of an imaging lens system according to a first embodiment, and Figure 2 Shows Figure 1 Aberration curves of the imaging lens system shown.
[0108] Reference Figure 1 , the imaging lens system 100 may include a first lens 110 , a second lens 120 , a third lens 130 , a fourth lens 140 , a fifth lens 150 , a sixth lens 160 and a seventh lens 170 .
[0109] The first lens 110 may have negative refractive power and may have a convex object side surface and a concave image side surface. The second lens 120 may have negative refractive power and may have a concave object side surface and a concave image side surface. The third lens 130 may have positive refractive power and may have a convex object side surface and a convex image side surface. The fourth lens 140 may have positive refractive power and may have a convex object side surface and a convex image side surface. The fifth lens 150 may have negative refractive power and may have a concave object side surface and a concave image side surface. The sixth lens 160 may have positive refractive power and may have a convex object side surface and a convex image side surface. The seventh lens 170 may have negative refractive power and may have a concave object side surface and a convex image side surface.
[0110] The imaging lens system 100 may include a lens having an inflection point. For example, in the imaging lens system 100 according to the first embodiment, an inflection point may be formed on the object side surface or the image side surface of the second lens 120 and the fourth to seventh lenses 140 to 170.
[0111] The imaging lens system 100 may further include a stop ST, a cover glass CG, a filter IF, and an imaging surface IP. The stop ST may be disposed between the third lens 130 and the fourth lens 140, and the cover glass CG and the filter IF may be disposed between the seventh lens 170 and the imaging surface IP. The imaging surface IP may be formed on a surface of the image sensor IS of the camera module or within the image sensor IS.
[0112] Table 1 and Table 2 below list lens characteristics and aspherical surface values of the imaging lens system according to the first embodiment.
[0113] Table 1
[0114]
[0115] Table 2
[0116] Surface number S3 S4 S5 S6 S8 S9 k 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 A 1.63835 0.32718 -0.05060 -0.00937 -0.03781 -0.07664 B -0.40700 -0.03447 -0.00260 0.00023 -0.00923 0.00346 C 0.11967 -0.02506 -0.00023 0.00003 -0.00190 -0.00194 D -0.03339 -0.00402 0.00067 0.00000 -0.00037 0.00024 E 0 0 0 0 0 0 F 0 0 0 0 0 0 G 0 0 0 0 0 0 H 0 0 0 0 0 0 J 0 0 0 0 0 0 Surface number S10 S11 S12 S13 S14 S15 k 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 A -0.26760 -0.40589 0.00809 0.32231 0.66569 0.71732 B 0.01887 0.02422 -0.00771 0.08991 -0.04384 -0.13722 C -0.00059 -0.00385 0.00019 -0.02094 -0.01246 0.02113 D 0.00038 0.00053 -0.00017 0.00535 0.00872 0.00009 E 0 0 0 0 0 0 F 0 0 0 0 0 0 G 0 0 0 0 0 0 H 0 0 0 0 0 0 J 0 0 0 0 0 0
[0117] Figure 3 is a diagram of an imaging lens system according to a second embodiment, and Figure 4 Shows Figure 3 Aberration curves of the imaging lens system shown.
[0118] Reference Figure 3, the imaging lens system 200 may include a first lens 210 , a second lens 220 , a third lens 230 , a fourth lens 240 , a fifth lens 250 , a sixth lens 260 and a seventh lens 270 .
[0119] The first lens 210 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The second lens 220 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The third lens 230 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The fourth lens 240 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The fifth lens 250 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The sixth lens 260 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The seventh lens 270 may have a negative refractive power and may have a concave object side surface and a convex image side surface.
[0120] The imaging lens system 200 may include a lens having an inflection point. For example, in the imaging lens system 200 according to the second embodiment, an inflection point may be formed on the object side surface or the image side surface of the second lens 220 and the fourth lens 240 to the seventh lens 270.
[0121] The imaging lens system 200 may further include a stop ST, a cover glass CG, a filter IF, and an imaging surface IP. The stop ST may be disposed between the third lens 230 and the fourth lens 240, and the cover glass CG and the filter IF may be disposed between the seventh lens 270 and the imaging surface IP. The imaging surface IP may be formed on a surface of the image sensor IS of the camera module or within the image sensor IS.
[0122] Table 3 and Table 4 below list lens characteristics and aspherical surface values of the imaging lens system according to the second embodiment.
[0123] Table 3
[0124]
[0125]
[0126] Table 4
[0127]
[0128]
[0129] Figure 5 is a diagram of an imaging lens system according to a third embodiment, and Figure 6 Shows Figure 5 Aberration curves of the imaging lens system shown.
[0130] Reference Figure 5 , the imaging lens system 300 may include a first lens 310 , a second lens 320 , a third lens 330 , a fourth lens 340 , a fifth lens 350 , a sixth lens 360 and a seventh lens 370 .
[0131] The first lens 310 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The second lens 320 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The third lens 330 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The fourth lens 340 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The fifth lens 350 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The sixth lens 360 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The seventh lens 370 may have a negative refractive power and may have a concave object side surface and a convex image side surface.
[0132] The imaging lens system 300 may include a lens having an inflection point. For example, in the imaging lens system 300 according to the third embodiment, an inflection point may be formed on the object side surface or the image side surface of the second lens 320 and the fourth lens 340 to the seventh lens 370.
[0133] The imaging lens system 300 may further include a stop ST, a cover glass CG, a filter IF, and an imaging surface IP. The stop ST may be disposed between the third lens 330 and the fourth lens 340, and the cover glass CG and the filter IF may be disposed between the seventh lens 370 and the imaging surface IP. The imaging surface IP may be formed on a surface of the image sensor IS of the camera module or within the image sensor IS.
[0134] Table 5 and Table 6 below list lens characteristics and aspherical surface values of the imaging lens system according to the third embodiment.
[0135] Table 5
[0136]
[0137]
[0138] Table 6
[0139]
[0140]
[0141] Figure 7 is a diagram of an imaging lens system according to a fourth embodiment, and Figure 8 Shows Figure 7 Aberration curves of the imaging lens system shown.
[0142] Reference Figure 7 , the imaging lens system 400 may include a first lens 410 , a second lens 420 , a third lens 430 , a fourth lens 440 , a fifth lens 450 , a sixth lens 460 and a seventh lens 470 .
[0143] The first lens 410 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The second lens 420 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The third lens 430 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The fourth lens 440 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The fifth lens 450 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The sixth lens 460 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The seventh lens 470 may have a negative refractive power and may have a concave object side surface and a convex image side surface.
[0144] The imaging lens system 400 may include a lens having an inflection point. For example, in the imaging lens system 400 according to the fourth embodiment, an inflection point may be formed on the object side surface or the image side surface of the second lens 420 and the fourth lens 440 to the seventh lens 470.
[0145] The imaging lens system 400 may further include a stop ST, a cover glass CG, a filter IF, and an imaging surface IP. The stop ST may be disposed between the third lens 430 and the fourth lens 440, and the cover glass CG and the filter IF may be disposed between the seventh lens 470 and the imaging surface IP. The imaging surface IP may be formed on a surface of the image sensor IS of the camera module or within the image sensor IS.
[0146] Table 7 and Table 8 below list lens characteristics and aspherical surface values of the imaging lens system according to the fourth embodiment.
[0147] Table 7
[0148]
[0149] Table 8
[0150] Surface number S3 S4 S5 S6 S8 S9 k 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 A 1.59031 0.51763 -0.05892 0.00692 -0.02245 -0.13962 B -0.35988 0.01952 -0.00355 0.00124 -0.00599 -0.01464 C 0.07413 -0.01767 -0.00059 0.00026 -0.00114 -0.00518 D -0.00849 -0.00494 0.00048 0.00000 -0.00013 -0.00015 E 0 0 0 0 0 0 F 0 0 0 0 0 0 G 0 0 0 0 0 0 H 0 0 0 0 0 0 J 0 0 0 0 0 0 Surface number S10 S11 S12 S13 S14 S15 k 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 A -0.40555 -0.44655 -0.01379 0.19628 0.30108 0.61138 B 0.04341 0.02367 -0.00692 0.09512 -0.03355 -0.13002 C 0.00218 -0.00436 0.00220 -0.02223 -0.02119 0.02257 D 0.00057 -0.00024 -0.00059 0.00624 0.00251 0.00053 E 0 0 0 0 0 0 F 0 0 0 0 0 0 G 0 0 0 0 0 0 H 0 0 0 0 0 0 J 0 0 0 0 0 0
[0151] Fig. 9 is a diagram of an imaging lens system according to a fifth embodiment, and Fig.10 Shows Fig. 9 Aberration curves of the imaging lens system shown.
[0152] Reference Fig. 9 , the imaging lens system 500 may include a first lens 510 , a second lens 520 , a third lens 530 , a fourth lens 540 , a fifth lens 550 , a sixth lens 560 and a seventh lens 570 .
[0153] The first lens 510 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The second lens 520 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The third lens 530 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The fourth lens 540 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The fifth lens 550 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The sixth lens 560 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The seventh lens 570 may have a negative refractive power and may have a concave object side surface and a convex image side surface.
[0154] The imaging lens system 500 may include a lens having an inflection point. For example, in the imaging lens system 500 according to the fifth embodiment, an inflection point may be formed on the object side surface or the image side surface of the second lens 520 and the fourth lens 540 to the seventh lens 570.
[0155] The imaging lens system 500 may further include a stop ST, a cover glass CG, a filter IF, and an imaging surface IP. The stop ST may be disposed between the third lens 530 and the fourth lens 540, and the cover glass CG and the filter IF may be disposed between the seventh lens 570 and the imaging surface IP. The imaging surface IP may be formed on a surface of the image sensor IS of the camera module or within the image sensor IS.
[0156] Table 9 and Table 10 below list lens characteristics and aspherical surface values of the imaging lens system according to the fifth embodiment.
[0157] Table 9
[0158]
[0159]
[0160] Table 10
[0161]
[0162]
[0163] Fig.11 is a diagram of an imaging lens system according to a sixth embodiment, and Fig.12 Shows Fig.11 Aberration curves of the imaging lens system shown.
[0164] Reference Fig.11 , the imaging lens system 600 may include a first lens 610 , a second lens 620 , a third lens 630 , a fourth lens 640 , a fifth lens 650 , a sixth lens 660 and a seventh lens 670 .
[0165] The first lens 610 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The second lens 620 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The third lens 630 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The fourth lens 640 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The fifth lens 650 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The sixth lens 660 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The seventh lens 670 may have a negative refractive power and may have a concave object side surface and a convex image side surface.
[0166] The imaging lens system 600 may include a lens having an inflection point. For example, in the imaging lens system 600 according to the sixth embodiment, an inflection point may be formed on the object side surface or the image side surface of the second lens 620 and the fourth lens 640 to the seventh lens 670.
[0167] The imaging lens system 600 may further include a stop ST, a cover glass CG, a filter IF, and an imaging surface IP. The stop ST may be disposed between the third lens 630 and the fourth lens 640, and the cover glass CG and the filter IF may be disposed between the seventh lens 670 and the imaging surface IP. The imaging surface IP may be formed on a surface of the image sensor IS of the camera module or within the image sensor IS.
[0168] Table 11 and Table 12 below list lens characteristics and aspherical surface values of the imaging lens system according to the sixth embodiment.
[0169] Table 11
[0170]
[0171] Table 12
[0172]
[0173]
[0174] Fig.13 is a diagram of an imaging lens system according to a seventh embodiment, and Fig.14 Shows Fig.13 Aberration curves of the imaging lens system shown.
[0175] Reference Fig.13 , the imaging lens system 700 includes a first lens 710 , a second lens 720 , a third lens 730 , a fourth lens 740 , a fifth lens 750 , a sixth lens 760 and a seventh lens 770 .
[0176] The first lens 710 may have negative refractive power and may have a convex object side surface and a concave image side surface. The second lens 720 may have negative refractive power and may have a concave object side surface and a concave image side surface. The third lens 730 may have positive refractive power and may have a concave object side surface and a convex image side surface. The fourth lens 740 may have positive refractive power and may have a convex object side surface and a convex image side surface. The fifth lens 750 may have negative refractive power and may have a convex object side surface and a concave image side surface. The sixth lens 760 may have positive refractive power and may have a convex object side surface and a convex image side surface. The seventh lens 770 may have negative refractive power and may have a concave object side surface and a convex image side surface.
[0177] The imaging lens system 700 may include a lens having an inflection point. For example, in the imaging lens system 700 according to the seventh embodiment, an inflection point may be formed on the object side surface or the image side surface of the second lens 720 and the fourth lens 740 to the seventh lens 770.
[0178] The imaging lens system 700 may further include a stop ST, a cover glass CG, a filter IF, and an imaging surface IP. The stop ST may be disposed between the third lens 730 and the fourth lens 740, and the cover glass CG and the filter IF may be disposed between the seventh lens 770 and the imaging surface IP. The imaging surface IP may be formed on a surface of the image sensor IS of the camera module or within the image sensor IS.
[0179] Table 13 and Table 14 below list lens characteristics and aspherical surface values of the imaging lens system according to the seventh embodiment.
[0180] Table 13
[0181]
[0182]
[0183] Table 14
[0184]
[0185] Fig.15 is a diagram of an imaging lens system according to an eighth embodiment, and Fig.16 Shows Fig.15 Aberration curves of the imaging lens system shown.
[0186] Reference Fig.15 , the imaging lens system 800 includes a first lens 810 , a second lens 820 , a third lens 830 , a fourth lens 840 , a fifth lens 850 , a sixth lens 860 and a seventh lens 870 .
[0187] The first lens 810 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The second lens 820 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The third lens 830 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The fourth lens 840 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The fifth lens 850 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The sixth lens 860 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The seventh lens 870 may have a negative refractive power and may have a concave object side surface and a convex image side surface.
[0188] The imaging lens system 800 may include a lens having an inflection point. For example, in the imaging lens system 800 according to the eighth embodiment, an inflection point may be formed on the object side surface or the image side surface of the second lens 820 and the fourth lens 840 to the seventh lens 870.
[0189] The imaging lens system 800 may further include a stop ST, a cover glass CG, a filter IF, and an imaging surface IP. The stop ST may be disposed between the third lens 830 and the fourth lens 840, and the cover glass CG and the filter IF may be disposed between the seventh lens 870 and the imaging surface IP. The imaging surface IP may be formed on the surface of the image sensor IS of the camera module or within the image sensor IS.
[0190] Table 15 and Table 16 below list lens characteristics and aspherical surface values of the imaging lens system according to the eighth embodiment.
[0191] Table 15
[0192]
[0193]
[0194] Table 16
[0195]
[0196]
[0197] Fig.17 is a diagram of an imaging lens system according to a ninth embodiment, and Fig.18 Shows Fig.17 Aberration curves of the imaging lens system shown.
[0198] Reference Fig.17 , the imaging lens system 900 includes a first lens 910 , a second lens 920 , a third lens 930 , a fourth lens 940 , a fifth lens 950 , a sixth lens 960 and a seventh lens 970 .
[0199] The first lens 910 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The second lens 920 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The third lens 930 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The fourth lens 940 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The fifth lens 950 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The sixth lens 960 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The seventh lens 970 may have a negative refractive power and may have a concave object side surface and a convex image side surface.
[0200] The imaging lens system 900 may include a lens having an inflection point. For example, in the imaging lens system 900 according to the ninth embodiment, an inflection point may be formed on the object side surface or the image side surface of the second lens 920 and the fourth lens 940 to the seventh lens 970.
[0201] The imaging lens system 900 may further include a stop ST, a cover glass CG, a filter IF, and an imaging surface IP. The stop ST may be disposed between the third lens 930 and the fourth lens 940, and the cover glass CG and the filter IF may be disposed between the seventh lens 970 and the imaging surface IP. The imaging surface IP may be formed on the surface of the image sensor IS of the camera module or within the image sensor IS.
[0202] Table 17 and Table 18 below list lens characteristics and aspherical surface values of the imaging lens system according to the ninth embodiment.
[0203] Table 17
[0204]
[0205] Table 18
[0206]
[0207]
[0208] Fig.19 is a diagram of an imaging lens system according to a tenth embodiment, and Fig. 20 Shows Fig.19 Aberration curves of the imaging lens system shown.
[0209] Reference Fig.19 , the imaging lens system 1000 includes a first lens 1010 , a second lens 1020 , a third lens 1030 , a fourth lens 1040 , a fifth lens 1050 , a sixth lens 1060 and a seventh lens 1070 .
[0210] The first lens 1010 may have negative refractive power and may have a convex object side surface and a concave image side surface. The second lens 1020 may have negative refractive power and may have a concave object side surface and a concave image side surface. The third lens 1030 may have positive refractive power and may have a concave object side surface and a convex image side surface. The fourth lens 1040 may have positive refractive power and may have a convex object side surface and a convex image side surface. The fifth lens 1050 may have negative refractive power and may have a convex object side surface and a concave image side surface. The sixth lens 1060 may have positive refractive power and may have a convex object side surface and a convex image side surface. The seventh lens 1070 may have negative refractive power and may have a concave object side surface and a convex image side surface.
[0211] The imaging lens system 1000 may include a lens having an inflection point. For example, in the imaging lens system 1000 according to the tenth embodiment, an inflection point may be formed on the object side surface or the image side surface of the second lens 1020 and the fourth lens 1040 to the seventh lens 1070.
[0212] The imaging lens system 1000 may further include a stop ST, a cover glass CG, a filter IF, and an imaging plane IP. The stop ST may be arranged between the third lens 1030 and the fourth lens 1040, and the cover glass CG and the filter IF may be arranged between the seventh lens 1070 and the imaging plane IP. The imaging plane IP may be formed on the surface of the image sensor IS of the camera module or in the image sensor IS.
[0213] Table 19 and Table 20 below list lens characteristics and aspherical surface values of the imaging lens system according to the tenth embodiment.
[0214] Table 19
[0215]
[0216]
[0217] Table 20
[0218] Surface number S3 S4 S5 S6 S8 S9 k 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 A 1.82739 0.65665 -0.12325 0.00582 -0.05196 -0.03742 B -0.40475 0.04207 -0.00353 0.00259 -0.00999 -0.00768 C 0.09507 -0.01814 -0.00015 0.00032 -0.00174 -0.00353 D -0.01078 -0.00603 0.00064 0.00000 0.00001 0.00063 E 0 0 0 0 0 0 F 0 0 0 0 0 0 G 0 0 0 0 0 0 H 0 0 0 0 0 0 J 0 0 0 0 0 0 Surface number S10 S11 S12 S13 S14 S15 k 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 A -0.40206 -0.51588 0.00512 0.22461 0.31101 0.72604 B 0.04859 0.01895 -0.01522 0.08361 -0.06262 -0.17036 C -0.00060 -0.00755 0.00294 -0.02611 -0.02083 0.04028 D 0.00081 -0.00095 -0.00109 0.01042 0.00451 -0.00009 E 0 0 0 0 0 0 F 0 0 0 0 0 0 G 0 0 0 0 0 0 H 0 0 0 0 0 0 J 0 0 0 0 0 0
[0219] Table 21 and Table 22 below list optical characteristic values and conditional expression values of the imaging lens systems according to the first embodiment to the tenth embodiment.
[0220] Table 21
[0221]
[0222]
[0223] Table 22
[0224] Conditional Expressions First embodiment Second embodiment Third embodiment Fourth embodiment Fifth embodiment f1 / f -6.9440 -6.7821 -7.2432 -7.2914 -7.1032 f1 / f4 -2.8799 -2.5870 -2.6277 -2.6241 -2.5393 f5 / f6 -1.0175 -1.1658 -1.1879 -1.2052 -1.2002 |V6-V5| 32.9814 33.6874 33.6874 33.6874 36.0731 L1ER1 / HFOV 0.0440 0.0499 0.0505 0.0465 0.0471 ImgHT / TTL 0.1598 0.1521 0.1515 0.1515 0.1515 HFOV / TTL 10.5556 10.0400 10.0000 10.0000 10.0000 D12 / D23 1.4441 1.3467 1.1226 1.1226 1.1082 (R8+R11) / T5 4.7226 5.3899 6.1439 4.6571 4.9141 |R3 / T2| 35.7740 27.7840 40.6023 21.3608 25.9019 |(R9+R10) / T5| 128.0117 60.2608 70.5214 54.5944 49.9733 (R11+R12) / T6 1.4330 1.1187 0.8683 0.6619 0.6585 Conditional Expressions Sixth embodiment Seventh embodiment Eighth embodiment Ninth embodiment Tenth embodiment f1 / f -6.4809 -6.8453 -7.4067 -8.0626 -7.6645 f1 / f4 -2.4137 -2.4626 -2.7013 -2.9378 -2.8896 f5 / f6 -1.1113 -1.1774 -1.1898 -1.1380 -1.1004 |V6-V5| 36.0731 36.4476 36.4476 36.4476 36.0959 L1ER1 / HFOV 0.0545 0.0547 0.0495 0.0378 0.0367 ImgHT / TTL 0.1441 0.1440 0.1499 0.1642 0.1683 HFOV / TTL 9.5000 9.5000 9.8916 10.8393 11.1052 D12 / D23 1.0297 1.0840 0.9385 0.9136 0.8078 (R8+R11) / T5 5.4667 6.6925 5.8228 6.8140 7.8381 |R3 / T2| 29.7609 23.7678 38.4000 38.9270 55.8813 |(R9+R10) / T5| 76.3499 57.9599 54.4799 64.0110 92.0747 (R11+R12) / T6 0.6813 0.8092 0.7725 0.8598 0.8901
[0225] As can be seen from Table 21 above, the embodiments of the above-described imaging lens system provide an imaging lens system with a low f-number and a wide field of view.
[0226] Although the present disclosure includes specific examples, it will be apparent after understanding the disclosure of the present application that various changes in form and detail may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are considered to be illustrative only and not for limiting purposes. The description of the features or aspects in each example is considered to be applicable to similar features or aspects in other examples. Suitable results may also be obtained if the described techniques are performed in a different order and / or if the components in the described systems, architectures, devices, or circuits are combined in different ways and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of the present disclosure is not limited by specific embodiments, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents will be interpreted as included in the present disclosure.
Claims
1. An imaging lens system, comprising: a first lens with negative refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power, a sixth lens with positive refractive power, and a seventh lens with negative refractive power, which are arranged in ascending numerical order from the object side of the imaging lens system toward the imaging surface of the imaging lens system along the optical axis of the imaging lens system, wherein the second lens has a concave object-side surface in its paraxial region, The seventh lens element has a convex image side surface in its paraxial region. wherein the number of lenses having refractive power in the imaging lens system is 7, and The imaging lens system satisfies the following conditional expression: -3.0 <f5 / f6<-1.0 -4.0 <f1 / f4<-2.4 190°≤HFOV 0.80 <D12 / D23<1.60 Among them, f1 is the focal length of the first lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, HFOV is the horizontal field of view of the imaging lens system, D12 is the distance along the optical axis from the image side surface of the first lens to the object side surface of the second lens, and D23 is the distance along the optical axis from the image side surface of the second lens to the object side surface of the third lens.
2. The imaging lens system according to claim 1, wherein: The third lens has a convex object-side surface in a paraxial region thereof.
3. The imaging lens system according to claim 1, wherein: The third lens has a convex image-side surface in a paraxial region thereof.
4. The imaging lens system according to claim 1, wherein: The fifth lens has a concave object-side surface in a paraxial region thereof.
5. The imaging lens system according to claim 1, wherein: The seventh lens has a concave object-side surface in a paraxial region thereof.
6. The imaging lens system according to claim 1, wherein: The imaging lens system also satisfies the following conditional expression: 0.03mm / ° <L1ER1 / HFOV<0.06mm / ° Wherein, L1ER1 is the effective radius of the object side surface of the first lens.
7. The imaging lens system according to claim 1, wherein: The imaging lens system also satisfies the following conditional expression: 0.10 <ImgHT / TTL<0.20 Wherein, ImgHT is the maximum effective image height on the imaging plane, and TTL is the distance from the object side of the first lens to the imaging plane along the optical axis.
8. The imaging lens system according to claim 1, wherein: The imaging lens system also satisfies the following conditional expression: 4.0<(R8+R11) / T5<8.0 Wherein, R8 is the curvature radius of the image side surface of the fourth lens at the optical axis, R11 is the curvature radius of the object side surface of the sixth lens at the optical axis, and T5 is the thickness of the fifth lens along the optical axis.
9. An imaging lens system, comprising: a first lens with negative refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power, a sixth lens with positive refractive power, and a seventh lens with negative refractive power, which are arranged in ascending numerical order from the object side of the imaging lens system toward the imaging surface of the imaging lens system along the optical axis of the imaging lens system, The seventh lens element has a convex image side surface in its paraxial region. Wherein, the number of lenses having refractive power in the imaging lens system is 7, The imaging lens system satisfies the following conditional expression: 190°≤HFOV 8.0° / mm <HFOV / TTL<12.0° / mm 0.80 <D12 / D23<1.60 Wherein, HFOV is the horizontal field of view of the imaging lens system, TTL is the distance along the optical axis from the object side surface of the first lens to the imaging surface, D12 is the distance along the optical axis from the image side surface of the first lens to the object side surface of the second lens, and D23 is the distance along the optical axis from the image side surface of the second lens to the object side surface of the third lens.
10. The imaging lens system according to claim 9, wherein: The second lens has a concave object-side surface in a paraxial region thereof.
11. The imaging lens system according to claim 9, wherein: The imaging lens system also satisfies the following conditional expression: 20<|R3 / T2|<60 Wherein, R3 is the radius of curvature of the object-side surface of the second lens at the optical axis, and T2 is the thickness of the second lens along the optical axis.
12. The imaging lens system according to claim 9, wherein: The imaging lens system also satisfies the following conditional expression: 46<|(R9+R10) / T5|<136 Wherein, R9 is the curvature radius of the object side surface of the fifth lens at the optical axis, R10 is the curvature radius of the image side surface of the fifth lens at the optical axis, and T5 is the thickness of the fifth lens along the optical axis.
13. The imaging lens system according to claim 9, wherein: The imaging lens system also satisfies the following conditional expression: 0.6<|(R11+R12) / T6|<1.6 Wherein, R11 is the curvature radius of the object side surface of the sixth lens at the optical axis, R12 is the curvature radius of the image side surface of the sixth lens at the optical axis, and T6 is the thickness of the sixth lens along the optical axis.