Optical image capturing system

Abstract

The optical imaging system includes a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens each having a refractive power, a fifth lens, a sixth lens, and a seventh lens, the first to seventh lenses being disposed in order from an object side. 0 lt is satisfied; f1 / f3lt; 0.4, 0.5 lt; tTL / (2 * IMG HT) lt; 0.58 DEG C and 160 DEG C lt; fOV * (2 * IMG HT / f) lt; in the optical imaging system, f1 is a focal length of the first lens, f3 is a focal length of the third lens, TTL is a distance on an optical axis from an object-side surface of the first lens to an imaging surface, IMG HT is half a diagonal length of the imaging surface, FOV is a field of view of the optical imaging system, and f is a total focal length of the optical imaging system.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0108632, filed on August 13, 2024, with the Korean Intellectual Property Office, and Korean Patent Application No. 10-2024-0175222, filed on November 29, 2024, the entire disclosure of which is incorporated herein by reference for all purposes. Technical Field

[0003] This disclosure relates to optical imaging systems. Background Technology

[0004] Mobile devices may include cameras with an optical imaging system consisting of multiple lenses to enable video calling and image capture.

[0005] Smaller mobile devices can include slimmer cameras with high resolution.

[0006] The above information is presented as background information and is intended to aid in understanding this disclosure. No determination or assertion is made as to whether any of the above content can be used as prior art with respect to this disclosure. Summary of the Invention

[0007] The summary portion of this invention is intended to provide a brief overview of the chosen concepts, which will be further described in the detailed description portion below. This summary portion is not intended to identify key or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

[0008] In general, the optical imaging system includes, sequentially arranged from the object side, a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with refractive power, a fifth lens with refractive power, a sixth lens with refractive power, and a seventh lens with refractive power. The optical imaging system satisfies 0 < f1 / f3 < 0.4, 0.5 < TTL / (2×IMG HT) < 0.58, and 160° < FOV×(2×IMG HT / f) < 180°, where f1 is the focal length of the first lens, f3 is the focal length of the third lens, TTL is the distance along the optical axis from the object side of the first lens to the imaging plane, IMG HT is half the diagonal length of the imaging plane, FOV is the field of view of the optical imaging system, and f is the total focal length of the optical imaging system.

[0009] The optical imaging system can satisfy any one or any two or more of any combination of 25 < v1-v2 < 45, 25 < v1-v4 < 45, and 15 < v1-v6 < 25, where v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, v4 is the Abbe number of the fourth lens, and v6 is the Abbe number of the sixth lens.

[0010] The optical imaging system can satisfy 0 < f1 / f < 1.4.

[0011] The optical imaging system can satisfy -10 < f2 / f < 0, where f2 is the focal length of the second lens.

[0012] The optical imaging system can satisfy -0.6 < f1 / f2 < 0, where f2 is the focal length of the second lens.

[0013] The optical imaging system can satisfy 0 < f3 / f < 10.

[0014] The optical imaging system can satisfy -13 < f4 / f < 0, where f4 is the focal length of the fourth lens.

[0015] The optical imaging system can satisfy -15 < f5 / f < 0, where f5 is the focal length of the fifth lens.

[0016] The optical imaging system can satisfy 0 < f6 / f < 1.5, where f6 is the focal length of the sixth lens.

[0017] The optical imaging system can satisfy -0.95 < f7 / f < 0, where f7 is the focal length of the seventh lens.

[0018] The optical imaging system can satisfy 1.0 < TTL / f < 1.3 and 0.15 < BFL / f < 0.3, where BFL is a distance along the optical axis from an image side surface of the seventh lens to an imaging surface.

[0019] The optical imaging system can satisfy 0 < D1 / f < 0.1, where D1 is a distance along the optical axis from an image side surface of the first lens to an object side surface of the second lens.

[0020] The optical imaging system can satisfy 1 < Fno x (TTL / (2 x IMG HT)) < 1.1, where Fno is an F number of the optical imaging system.

[0021] Two or more of the first lens through the seventh lens can have a refractive power greater than 1.6 and a negative refractive power.

[0022] The refractive indices of the fourth and fifth lenses can be greater than 1.6 and less than 1.7. The fourth and fifth lenses can each possess negative refractive power.

[0023] Among the first to seventh lenses, the fourth and fifth lenses have the largest absolute values ​​of their focal lengths.

[0024] Other features and aspects will become apparent from the following detailed description and accompanying drawings. Attached Figure Description

[0025] Figure 1 This is a configuration diagram of an optical imaging system according to a first embodiment of the present disclosure.

[0026] Figure 2 It is shown Figure 1 The diagram shows the aberration characteristics of the optical imaging system.

[0027] Figure 3 This is a configuration diagram of an optical imaging system according to a second embodiment of the present disclosure.

[0028] Figure 4 It is shown Figure 3 The diagram shows the aberration characteristics of the optical imaging system.

[0029] Figure 5 This is a configuration diagram of an optical imaging system according to a third embodiment of the present disclosure.

[0030] Figure 6 It is shown Figure 5 The diagram shows the aberration characteristics of the optical imaging system.

[0031] Figure 7 This is a configuration diagram of an optical imaging system according to a fourth embodiment of the present disclosure.

[0032] Figure 8 It is shown Figure 7 The diagram shows the aberration characteristics of the optical imaging system.

[0033] Figure 9 This is a configuration diagram of an optical imaging system according to a fifth embodiment of the present disclosure.

[0034] Figure 10 It is shown Figure 9 The diagram shows the aberration characteristics of the optical imaging system.

[0035] Figure 11 This is a configuration diagram of an optical imaging system according to a sixth embodiment of the present disclosure.

[0036] Figure 12 It is shown Figure 11 The diagram shows the aberration characteristics of the optical imaging system.

[0037] Figure 13 is a configuration diagram of an optical imaging system according to a seventh embodiment of the present disclosure.

[0038] Figure 14 is a graph showing an aberration characteristic of the optical imaging system shown in Figure 13

[0039] Figure 15 is a configuration diagram of an optical imaging system according to an eighth embodiment of the present disclosure.

[0040] Figure 16 is a graph showing an aberration characteristic of the optical imaging system shown in Figure 15

[0041] Figure 17 is a configuration diagram of an optical imaging system according to a ninth embodiment of the present disclosure.

[0042] Figure 18 is a graph showing an aberration characteristic of the optical imaging system shown in Figure 17

[0043] Figure 19 is a configuration diagram of an optical imaging system according to a tenth embodiment of the present disclosure.

[0044] Figure 20 is a graph showing an aberration characteristic of the optical imaging system shown in Figure 19

[0045] Throughout the drawings and detailed description, unless otherwise described, like reference characters refer to like elements. The drawings can not be to scale, and the relative dimensions, proportions, and depiction of elements in the drawings can be exaggerated for purpose of clarity, illustration, and convenience. DETAILED DESCRIPTION

[0046] Hereinafter, while examples of the present disclosure will be described in detail with reference to the accompanying drawings, it should be noted that the examples are not limited thereto.

[0047] The following detailed description is provided to help the reader obtain a thorough understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will become apparent to those skilled in the art after understanding the present disclosure. For example, the order of the operations described herein is merely an example, and is not limited to the order set forth herein, except for operations that must occur in a specific order, and can be changed, which will be apparent to those skilled in the art after understanding the present disclosure. In addition, descriptions of features that are well known in the art can be omitted for the sake of clarity and conciseness.

[0048] ​​​​The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, these examples are provided as illustrative of a number of possible ways to implement the methods, devices, and / or systems described herein.

[0049] Throughout the specification, when an element such as a layer, region, or substrate is referred to as being "on", "connected to", or "coupled to" another element, it can be directly on, directly connected to, or directly coupled to the other element, or one or more other elements can be interposed therebetween. Conversely, when an element is referred to as being "directly on", "directly connected to", or "directly coupled to" another element, there are no other elements interposed therebetween.

[0050] As used herein, the term "and / or" includes any one of the associated listed items, as well as any combination of any two or more of the associated listed items; likewise, "at least one of' includes any one of the associated listed items, as well as any combination of any two or more of the associated listed items.

[0051] Although terminology can be used in this document, such as "first", "second", and "third", that does not limit the scope of the examples described herein. Rather, such terminology can be used in a descriptive sense. For example, a first element or component can be termed a second element or component, and, similarly, a second element or component can be termed a first element or component, without departing from the teachings of the examples described herein. As used herein, the term "exemplary" is intended to be used as an example rather than to imply a ranking of preference of one example over another. As used herein, "if' can be construed to mean "when" or "if-when" or "if-then". Stated in other words, when a condition is satisfied, an action is performed. Alternatively, if a condition is not satisfied, the action is not performed.

[0052] Spatially relative terms, such as "on", "above", "below", "top", "bottom", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device in the figures is turned over, elements described as being "on" or "above" other elements or features would then be oriented "below" or "on" the other elements or features. Thus, the spatially relative terms can encompass the various orientations of the device in use or operation. The device can be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0053] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the present disclosure. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an overly literal sense unless expressly so defined herein.

[0054] The shapes shown in the drawings can vary due to manufacturing techniques and / or tolerances. Thus, the examples described herein are not limited to the specific shapes shown in the drawings, but include variations of the shapes that occur during manufacturing.

[0055] It should be noted that the phrase "may" is used herein in relation to examples, for example, with respect to what an example can include or implement, means that there is at least one example for which the feature is included or implemented, and no example is limited to this.

[0056] Features of the examples described herein can be combined in a variety of ways as will be apparent after understanding the disclosure. Also, although examples described herein have a variety of configurations, other configurations are possible in light of the disclosure.

[0057] An optical imaging system according to an embodiment of the disclosure includes seven lenses.

[0058] The first lens refers to a lens closest to the object side, and the seventh lens refers to a lens closest to the imaging surface (or image sensor).

[0059] Also, in the present specification, the values of the radius of curvature, the thickness, the distance, the focal length, etc. of the lenses are in units of millimeters (mm), and the unit of the field of view (FOV) is degrees.

[0060] Also, in the description of the shape of each lens, where one surface is in a convex shape means that the paraxial region of the one surface is convex, and where one surface is in a concave shape means that the paraxial region of the one surface is concave.

[0061] Therefore, even if one surface of a lens is described as having a convex shape, the edge portion of the lens can be concave. Likewise, even if one surface of a lens is described as having a concave shape, the edge portion of the lens can be convex.

[0062] Meanwhile, the paraxial region refers to a very narrow region close to the optical axis.

[0063] An imaging surface can refer to a virtual plane on which a focus is formed by an optical imaging system. Alternatively, the imaging surface can refer to a surface of an image sensor that receives light.

[0064] An optical imaging system according to an embodiment of the disclosure includes at least seven lenses.

[0065] For example, the optical imaging system according to an embodiment of the disclosure can include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens disposed in this order from an object side. The first lens to the seventh lens can be spaced apart from each other by a predetermined distance along an optical axis, respectively.

[0066] The optical imaging system according to an embodiment of the disclosure can further include an image sensor for converting an incident image of an object into an electrical signal.

[0067] In addition, the optical imaging system can further include an infrared filter (hereinafter referred to as a "filter") to block infrared rays. The filter is disposed between the seventh lens and the image sensor.

[0068] In addition, the optical imaging system can further include a diaphragm for controlling the amount of light.

[0069] The first lens to the seventh lens constituting the optical imaging system according to an embodiment of the disclosure can be formed of a plastic material.

[0070] In addition, at least one lens among the first lens to the seventh lens can have an aspherical surface. For example, the first lens to the seventh lens can each have at least one aspherical surface.

[0071] That is, at least one of an object side surface and an image side surface of each of the first lens to the seventh lens can be aspherical. In this case, the aspherical surface of the first lens to the seventh lens is represented by Equation 1 below.

[0072] Equation 1:

[0073] In Equation 1, c is a curvature of a lens (an inverse of a radius of curvature), K is a conic constant, and Y denotes a distance from a certain point on the aspherical surface of the lens to the optical axis. In addition, constants A to H, J, and L to P refer to aspherical coefficients. In addition, Z denotes a distance in the optical axis direction between the certain point on the aspherical surface of the lens and a vertex of the aspherical surface.

[0074] The optical imaging system according to an embodiment of the disclosure can satisfy at least one of the following conditional expressions.

[0075] In an embodiment, the optical imaging system can satisfy a conditional expression 0 < f1 / f < 1.4. In this case, f1 is a focal length of the first lens, and f is a total focal length of the optical imaging system. Accordingly, occurrence of aberration can be minimized by properly adjusting a refractive power of the first lens.

[0076] In an embodiment, the optical imaging system can satisfy a conditional expression 25 < v1-v2 < 45. In this case, v1 is an Abbe number of the first lens, and v2 is an Abbe number of the second lens. Accordingly, chromatic aberration can be improved.

[0077] In an embodiment, the optical imaging system can satisfy a conditional expression 25 < v1-v4 < 45. In this case, v4 is an Abbe number of the fourth lens. Accordingly, chromatic aberration can be improved.

[0078] In an embodiment, the optical imaging system can satisfy a conditional expression 15 < v1-v6 < 25. In this case, v6 is an Abbe number of the sixth lens. Accordingly, chromatic aberration can be improved.

[0079] In an embodiment, the optical imaging system can satisfy a conditional expression -10 < f2 / f < 0. In this case, f2 is a focal length of the second lens. Accordingly, occurrence of aberration can be minimized by properly adjusting a refractive power of the second lens.

[0080] In an embodiment, the optical imaging system can satisfy a conditional expression 0 < f3 / f < 10. In this case, f3 is a focal length of the third lens. Accordingly, occurrence of aberration can be minimized by properly adjusting a refractive power of the third lens.

[0081] In an embodiment, the optical imaging system can satisfy a conditional expression -13 < f4 / f < 0. In this case, f4 is a focal length of the fourth lens. Accordingly, occurrence of aberration can be minimized by properly adjusting a refractive power of the fourth lens.

[0082] In an embodiment, the optical imaging system can satisfy a conditional expression -15 < f5 / f < 0. In this case, f5 is a focal length of the fifth lens. Accordingly, occurrence of aberration can be minimized by properly adjusting a refractive power of the fifth lens.

[0083] In an embodiment, the optical imaging system can satisfy a conditional expression 0 < f6 / f < 1.5. In this case, f6 is a focal length of the sixth lens. Accordingly, occurrence of aberration can be minimized by properly adjusting a refractive power of the sixth lens.

[0084] In an embodiment, the optical imaging system can satisfy a conditional expression -0.95 < f7 / f < 0. In this case, f7 is a focal length of the seventh lens. Accordingly, an image resolution can be improved and a field curvature phenomenon can be reduced.

[0085] In an embodiment, the optical imaging system can satisfy a conditional expression 1.0 < TTL / f < 1.3. In this case, TTL is a distance on the optical axis from the object side surface of the first lens to the image plane. Accordingly, the optical imaging system can have a proper field of view and a total track length (TTL).

[0086] In an embodiment, the optical imaging system can satisfy a conditional expression -0.6 < f1 / f2 < 0. Accordingly, a resolution can be improved by properly adjusting the refractive power of the first lens and the second lens.

[0087] In an embodiment, the optical imaging system can satisfy a conditional expression 0 < f1 / f3 < 0.4. Accordingly, a resolution can be improved by properly adjusting the refractive power of the first lens and the third lens.

[0088] In an embodiment, the optical imaging system can satisfy a conditional expression 0.15 < BFL / f < 0.3. In this case, BFL is a distance along the optical axis from the image side surface of the seventh lens to the image plane. Accordingly, the optical imaging system can be miniaturized.

[0089] In an embodiment, the optical imaging system can satisfy a conditional expression 0 < D1 / f < 0.1. In this case, D1 is a distance on the optical axis from the image side surface of the first lens to the object side surface of the second lens. Accordingly, chromatic aberration can be improved.

[0090] In an embodiment, the optical imaging system can satisfy a conditional expression 0.5 < TTL / (2×IMG HT) <0.58. In this case, IMG HT is half of a diagonal length of the image plane. Accordingly, the optical imaging system can be miniaturized.

[0091] In an embodiment, the optical imaging system can satisfy a conditional expression 160° < FOV×(2×IMG HT / f) <180°. FOV is a field of view of the optical imaging system. Accordingly, the optical imaging system can have a proper field of view and a total track length (TTL), and occurrence of aberration can be minimized.

[0092] In an embodiment, the optical imaging system can satisfy a conditional expression 1 < Fno x (TTL / (2 x IMG HT)) < 1.1. In this case, Fno can refer to an F number of the optical imaging system. Accordingly, brightness of the optical imaging system can be improved (i.e., a bright image can be capable of being captured), and the optical imaging system can be miniaturized.

[0093] The first lens can have a positive refractive power. In addition, the first lens can have a meniscus shape convex toward the object side. For example, the object side surface of the first lens can be convex in the paraxial region, and the image side surface of the first lens can be concave in the paraxial region.

[0094] The second lens can have a negative refractive power. In addition, the second lens can have a meniscus shape convex toward the object side. For example, the object side surface of the second lens can be convex in the paraxial region, and the image side surface of the second lens can be concave in the paraxial region.

[0095] The third lens can have a positive refractive power. In addition, the third lens can have a shape in which both surfaces are convex. For example, the object side surface and the image side surface of the third lens can be convex in the paraxial region. Alternatively, the third lens can have a meniscus shape convex toward the object side. For example, the object side surface of the third lens can be convex in the paraxial region, and the image side surface of the third lens can be concave in the paraxial region.

[0096] The fourth lens can have a negative refractive power. In addition, the fourth lens can have a shape in which both surfaces are concave. For example, the object side surface and the image side surface of the fourth lens can be concave in the paraxial region. Alternatively, the fourth lens can have a meniscus shape convex toward the image side. For example, the object side surface of the fourth lens can be concave in the paraxial region, and the image side surface of the fourth lens can be convex in the paraxial region. Alternatively, the fourth lens can have a meniscus shape convex toward the object side. For example, the object side surface of the fourth lens can be convex in the paraxial region, and the image side surface of the fourth lens can be concave in the paraxial region.

[0097] The fifth lens can have a negative refractive power. In addition, the fifth lens can have a meniscus shape convex toward the object side. For example, the object side surface of the fifth lens can be convex in the paraxial region, and the image side surface of the fifth lens can be concave in the paraxial region.

[0098] The sixth lens can have a positive refractive power. In addition, the sixth lens can have a meniscus shape convex toward the object side. For example, the object side surface of the sixth lens can be convex in the paraxial region, and the image side surface of the sixth lens can be concave in the paraxial region. Alternatively, the sixth lens can have a shape in which both surfaces are convex. For example, the object side surface and the image side surface of the sixth lens can be convex in the paraxial region.

[0099] The seventh lens can have a negative refractive power. Also, the seventh lens can have a meniscus shape convex toward the object side. For example, the object side surface of the seventh lens can be convex in the paraxial region, and the image side surface of the seventh lens can be concave in the paraxial region.

[0100] Also, one or more of the sixth lens and the seventh lens can have at least one inflection point formed on at least one of the object side surface and the image side surface thereof. For example, the object side surface of the sixth lens can be convex in the paraxial region, and concave in a portion other than the paraxial region. The image side surface of the seventh lens can be concave in the paraxial region, and convex in a portion other than the paraxial region.

[0101] The optical imaging system can be configured to have a field of view greater than 80°. In an embodiment, the field of view of the optical imaging system can be less than 90°.

[0102] In an embodiment, at least two of the first lens to the seventh lens can have a refractive index greater than 1.6. All of the lenses having a refractive index greater than 1.6 can have a negative refractive power.

[0103] In an embodiment, at least two of the first lens to the seventh lens can have a refractive index of 1.67 or more. For example, the refractive index of the second lens and the refractive index of the fourth lens can be greater than or equal to 1.67 and less than 1.7, respectively.

[0104] In an embodiment, at least two lenses having a refractive index greater than 1.6 can be adjacently disposed. For example, the fourth lens and the fifth lens adjacently disposed can have a refractive index greater than 1.6 and less than 1.7, respectively.

[0105] Further, among the first lens to the seventh lens, the absolute value of the focal length of the fourth lens or the fifth lens can be configured to be the largest.

[0106] The first lens to the seventh lens respectively have a predetermined Abbe number. At least three lenses among the first lens to the seventh lens can have an Abbe number less than 26 and greater than 15. Further, all of the lenses having an Abbe number less than 26 can have a negative refractive power.

[0107] In an embodiment, the number of lenses having an Abbe number less than 26 can be three.

[0108] Reference will be made to Figure 1 and Figure 2 An optical imaging system 100 according to a first embodiment of the disclosure will be described.

[0109] The optical imaging system 100 according to the first embodiment of the present disclosure can 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, and can further include an optical filter IF and an image sensor.

[0110] The optical imaging system 100 according to the first embodiment of the present disclosure can form a focal point on an imaging plane IP.

[0111] Lens properties (a radius of curvature, a thickness of a lens or a distance between lenses, a refractive index, and an Abbe number) of each lens are shown in Table 1.

[0112] Table 1

[0113] In the first embodiment of the present disclosure, the first lens 110 can have a positive refractive power, an object side surface of the first lens 110 can be convex in a paraxial region, and an image side surface of the first lens 110 can be concave in the paraxial region.

[0114] The second lens 120 can have a negative refractive power, an object side surface of the second lens 120 can be convex in a paraxial region, and an image side surface of the second lens 120 can be concave in the paraxial region.

[0115] The third lens 130 can have a positive refractive power, and an object side surface and an image side surface of the third lens 130 can be convex in a paraxial region.

[0116] The fourth lens 140 can have a negative refractive power, and an object side surface and an image side surface of the fourth lens 140 can be concave in a paraxial region.

[0117] The fifth lens 150 can have a negative refractive power, an object side surface of the fifth lens 150 can be convex in a paraxial region, and an image side surface of the fifth lens 150 can be concave in the paraxial region.

[0118] The sixth lens 160 can have a positive refractive power, an object side surface of the sixth lens 160 can be convex in a paraxial region, and an image side surface of the sixth lens 160 can be concave in the paraxial region.

[0119] The seventh lens 170 can have a negative refractive power, an object side surface of the seventh lens 170 can be convex in a paraxial region, and an image side surface of the seventh lens 170 can be concave in the paraxial region.

[0120] In addition, one or more of the sixth lens 160 and the seventh lens 170 can have at least one inflection point formed on at least one of an object side surface and an image side surface thereof.

[0121] Meanwhile, each surface of the first to seventh lenses 110 to 170 can have an aspherical coefficient as shown in Table 2. For example, both the object side surface and the image side surface of the first to seventh lenses 110 to 170 can be aspherical.

[0122] Table 2

[0123] In addition, the optical imaging system configured as described above can have an aberration characteristic as shown in Table 3. Figure 2

[0124] An optical imaging system 200 according to a second embodiment of the present disclosure will be described with reference to Figure 3 and Figure 4 An optical imaging system 200 according to a second embodiment of the present disclosure will be described with reference to

[0125] The optical imaging system 200 according to the second embodiment of the present disclosure can 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, and can further include an optical filter IF and an image sensor.

[0126] The optical imaging system 200 according to the second embodiment of the present disclosure can form a focal point on an imaging plane IP.

[0127] The lens characteristics (radius of curvature, thickness of a lens or distance between lenses, refractive index, and Abbe number) of each lens are shown in Table 3.

[0128] Table 3

[0129] In the second embodiment of the present disclosure, the first lens 210 can have a positive refractive power, the object side surface of the first lens 210 can be convex in the paraxial region, and the image side surface of the first lens 210 can be concave in the paraxial region.

[0130] The second lens 220 can have a negative refractive power, the object side surface of the second lens 220 can be convex in the paraxial region, and the image side surface of the second lens 220 can be concave in the paraxial region.

[0131] The third lens 230 can have a positive refractive power, and both the object side surface and the image side surface of the third lens 230 can be convex in the paraxial region.

[0132] The fourth lens 240 can have a negative refractive power, and both the object side surface and the image side surface of the fourth lens 240 can be concave in the paraxial region.

[0133] ​The fifth lens 250 can have a negative refractive power, the object side surface of the fifth lens 250 can be convex in the paraxial region, and the image side surface of the fifth lens 250 can be concave in the paraxial region.

[0134] The sixth lens 260 can have a positive refractive power, the object side surface of the sixth lens 260 can be convex in the paraxial region, and the image side surface of the sixth lens 260 can be concave in the paraxial region.

[0135] The seventh lens 270 can have a negative refractive power, the object side surface of the seventh lens 270 can be convex in the paraxial region, and the image side surface of the seventh lens 270 can be concave in the paraxial region.

[0136] In addition, one or more of the sixth lens 260 and the seventh lens 270 can have at least one inflection point formed on at least one of the object side surface and the image side surface thereof.

[0137] Meanwhile, each surface of the first lens 210 to the seventh lens 270 can have an aspheric coefficient as shown in Table 4. For example, both the object side surface and the image side surface of the first lens 210 to the seventh lens 270 can be aspheric.

[0138] Table 4

[0139] In addition, the optical imaging system configured as described above can have an aberration characteristic as shown in Figure 4

[0140] Figure 5 and Figure 6 An optical imaging system 300 according to a third embodiment of the disclosure will be described with reference to

[0141] The optical imaging system 300 according to the third embodiment of the disclosure can 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, and can further include an optical filter IF and an image sensor.

[0142] The optical imaging system 300 according to the third embodiment of the disclosure can form a focal point on an imaging plane IP.

[0143] The lens characteristics (the radius of curvature, the thickness of the lens or the distance between the lenses, the refractive index, and the Abbe number) of each lens are shown in Table 5.

[0144] Table 5

[0145] ​​In the third embodiment of the disclosure, the first lens 310 can have a positive refractive power, the object side surface of the first lens 310 can be convex in the paraxial region, and the image side surface of the first lens 310 can be concave in the paraxial region.

[0146] The second lens 320 can have a negative refractive power, the object side surface of the second lens 320 can be convex in the paraxial region, and the image side surface of the second lens 320 can be concave in the paraxial region.

[0147] The third lens 330 can have a positive refractive power, and the object side surface and the image side surface of the third lens 330 can be convex in the paraxial region.

[0148] The fourth lens 340 can have a negative refractive power, the object side surface of the fourth lens 340 can be concave in the paraxial region, and the image side surface of the fourth lens 340 can be convex in the paraxial region.

[0149] The fifth lens 350 can have a negative refractive power, the object side surface of the fifth lens 350 can be convex in the paraxial region, and the image side surface of the fifth lens 350 can be concave in the paraxial region.

[0150] The sixth lens 360 can have a positive refractive power, the object side surface of the sixth lens 360 can be convex in the paraxial region, and the image side surface of the sixth lens 360 can be concave in the paraxial region.

[0151] The seventh lens 370 can have a negative refractive power, the object side surface of the seventh lens 370 can be convex in the paraxial region, and the image side surface of the seventh lens 370 can be concave in the paraxial region.

[0152] In addition, one or more of the sixth lens 360 and the seventh lens 370 can have at least one inflection point formed on at least one of the object side surface and the image side surface thereof.

[0153] Meanwhile, each surface of the first lens 310 to the seventh lens 370 can have an aspherical coefficient as shown in Table 6. For example, both the object side surface and the image side surface of the first lens 310 to the seventh lens 370 can be aspherical.

[0154] Table 6

[0155] In addition, the optical imaging system configured as described above can have an aberration characteristic as shown in Figure 6

[0156] Reference will be made to Figure 7 and Figure 8 ​An optical imaging system 400 according to a fourth embodiment of the disclosure is described.

[0157] The optical imaging system 400 according to the fourth embodiment of the disclosure can 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, and can further include an optical filter IF and an image sensor.

[0158] The optical imaging system 400 according to the fourth embodiment of the disclosure can form a focal point on an imaging plane IP.

[0159] Lens properties (a radius of curvature, a thickness of a lens or a distance between lenses, a refractive index, and an Abbe number) of each lens are shown in Table 7.

[0160] Table 7

[0161] In the fourth embodiment of the disclosure, the first lens 410 can have a positive refractive power, an object side surface of the first lens 410 can be convex in a paraxial region, and an image side surface of the first lens 410 can be concave in the paraxial region.

[0162] The second lens 420 can have a negative refractive power, an object side surface of the second lens 420 can be convex in a paraxial region, and an image side surface of the second lens 420 can be concave in the paraxial region.

[0163] The third lens 430 can have a positive refractive power, and an object side surface and an image side surface of the third lens 430 can be convex in a paraxial region.

[0164] The fourth lens 440 can have a negative refractive power, and an object side surface and an image side surface of the fourth lens 440 can be concave in a paraxial region.

[0165] The fifth lens 450 can have a negative refractive power, an object side surface of the fifth lens 450 can be convex in a paraxial region, and an image side surface of the fifth lens 450 can be concave in the paraxial region.

[0166] The sixth lens 460 can have a positive refractive power, an object side surface of the sixth lens 460 can be convex in a paraxial region, and an image side surface of the sixth lens 460 can be concave in the paraxial region.

[0167] The seventh lens 470 can have a negative refractive power, an object side surface of the seventh lens 470 can be convex in a paraxial region, and an image side surface of the seventh lens 470 can be concave in the paraxial region.

[0168] In addition, one or more of the sixth lens 460 and the seventh lens 470 can have at least one inflection point formed on at least one of the object side surface and the image side surface thereof.

[0169] Meanwhile, each surface of the first lens 410 to the seventh lens 470 can have an aspheric coefficient as shown in Table 8. For example, both the object side surface and the image side surface of the first lens 410 to the seventh lens 470 can be aspheric.

[0170] Table 8:

[0171] In addition, the optical imaging system configured as described above can have an aberration characteristic as shown in Table 9. Figure 8

[0172] An optical imaging system 500 according to a fifth embodiment of the present disclosure will be described with reference to Figure 9 and Figure 10 An optical imaging system 500 according to a fifth embodiment of the present disclosure will be described with reference to

[0173] The optical imaging system 500 according to the fifth embodiment of the present disclosure can 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, and can further include an optical filter IF and an image sensor.

[0174] The optical imaging system 500 according to the fifth embodiment of the present disclosure can form a focal point on an imaging plane IP.

[0175] The lens characteristics (curvature radius, thickness of a lens or distance between lenses, refractive index, and Abbe number) of each lens are shown in Table 9.

[0176] Table 9

[0177] In the fifth embodiment of the present disclosure, the first lens 510 can have a positive refractive power, the object side surface of the first lens 510 can be convex in the paraxial region, and the image side surface of the first lens 510 can be concave in the paraxial region.

[0178] The second lens 520 can have a negative refractive power, the object side surface of the second lens 520 can be convex in the paraxial region, and the image side surface of the second lens 520 can be concave in the paraxial region.

[0179] The third lens 530 can have a positive refractive power, and the object side surface and the image side surface of the third lens 530 can be convex in the paraxial region.

[0180] ​The fourth lens 540 can have a negative refractive power, the object side surface of the fourth lens 540 can be convex in the paraxial region, and the image side surface of the fourth lens 540 can be concave in the paraxial region.

[0181] The fifth lens 550 can have a negative refractive power, the object side surface of the fifth lens 550 can be convex in the paraxial region, and the image side surface of the fifth lens 550 can be concave in the paraxial region.

[0182] The sixth lens 560 can have a positive refractive power, and the object side surface and the image side surface of the sixth lens 560 can be convex in the paraxial region.

[0183] The seventh lens 570 can have a negative refractive power, the object side surface of the seventh lens 570 can be convex in the paraxial region, and the image side surface of the seventh lens 570 can be concave in the paraxial region.

[0184] In addition, one or more of the sixth lens 560 and the seventh lens 570 can have at least one inflection point formed on at least one of the object side surface and the image side surface thereof.

[0185] Meanwhile, each surface of the first lens 510 to the seventh lens 570 can have an aspheric coefficient as shown in Table 10. For example, both the object side surface and the image side surface of the first lens 510 to the seventh lens 570 can be aspheric.

[0186] Table 10

[0187] In addition, the optical imaging system configured as described above can have an aberration characteristic as shown in Figure 10

[0188] The optical imaging system 600 according to the sixth embodiment of the present disclosure will be described with reference to Figure 11 and Figure 12 The optical imaging system 600 according to the sixth embodiment of the present disclosure will be described with reference to

[0189] The optical imaging system 600 according to the sixth embodiment of the present disclosure can 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, and can further include an optical filter IF and an image sensor.

[0190] The optical imaging system 600 according to the sixth embodiment of the present disclosure can form a focal point on an imaging plane IP.

[0191] The lens characteristics (curvature radius, thickness of a lens or distance between lenses, refractive index, and Abbe number) of each lens are shown in Table 11. ​

[0192] Table 11

[0193] In the sixth embodiment of the disclosure, the first lens 610 can have a positive refractive power, the object side surface of the first lens 610 can be convex in the paraxial region, and the image side surface of the first lens 610 can be concave in the paraxial region.

[0194] The second lens 620 can have a negative refractive power, the object side surface of the second lens 620 can be convex in the paraxial region, and the image side surface of the second lens 620 can be concave in the paraxial region.

[0195] The third lens 630 can have a positive refractive power, and the object side surface and the image side surface of the third lens 630 can be convex in the paraxial region.

[0196] The fourth lens 640 can have a negative refractive power, and the object side surface and the image side surface of the fourth lens 640 can be concave in the paraxial region.

[0197] The fifth lens 650 can have a negative refractive power, the object side surface of the fifth lens 650 can be convex in the paraxial region, and the image side surface of the fifth lens 650 can be concave in the paraxial region.

[0198] The sixth lens 660 can have a positive refractive power, the object side surface of the sixth lens 660 can be convex in the paraxial region, and the image side surface of the sixth lens 660 can be concave in the paraxial region.

[0199] The seventh lens 670 can have a negative refractive power, the object side surface of the seventh lens 670 can be convex in the paraxial region, and the image side surface of the seventh lens 670 can be concave in the paraxial region.

[0200] In addition, one or more of the sixth lens 660 and the seventh lens 670 can have at least one inflection point formed on at least one of the object side surface and the image side surface thereof.

[0201] Meanwhile, each surface of the first lens 610 to the seventh lens 670 can have an aspherical coefficient as shown in Table 12. For example, both the object side surface and the image side surface of the first lens 610 to the seventh lens 670 can be aspherical.

[0202] Table 12

[0203] In addition, the optical imaging system configured as described above can have an aberration characteristic as shown in Table 13. Figure 12 ​

[0204] An optical imaging system according to a seventh embodiment of the present disclosure will be described with reference to Figure 13 and Figure 14 An optical imaging system 700 according to a seventh embodiment of the present disclosure will be described.

[0205] The optical imaging system 700 according to the seventh embodiment of the present disclosure can include 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, and can further include an optical filter IF and an image sensor.

[0206] The optical imaging system 700 according to the seventh embodiment of the present disclosure can form a focal point on an imaging plane IP.

[0207] Lens properties (a radius of curvature, a thickness of a lens or a distance between lenses, a refractive index, and an Abbe number) of each lens are shown in Table 13.

[0208] Table 13

[0209] In the seventh embodiment of the present disclosure, the first lens 710 can have a positive refractive power, an object side surface of the first lens 710 can be convex in a paraxial region, and an image side surface of the first lens 710 can be concave in the paraxial region.

[0210] The second lens 720 can have a negative refractive power, an object side surface of the second lens 720 can be convex in a paraxial region, and an image side surface of the second lens 720 can be concave in the paraxial region.

[0211] The third lens 730 can have a positive refractive power, an object side surface of the third lens 730 can be convex in a paraxial region, and an image side surface of the third lens 730 can be concave in the paraxial region.

[0212] The fourth lens 740 can have a negative refractive power, and an object side surface and an image side surface of the fourth lens 740 can be concave in a paraxial region.

[0213] The fifth lens 750 can have a negative refractive power, an object side surface of the fifth lens 750 can be convex in a paraxial region, and an image side surface of the fifth lens 750 can be concave in the paraxial region.

[0214] The sixth lens 760 can have a positive refractive power, an object side surface of the sixth lens 760 can be convex in a paraxial region, and an image side surface of the sixth lens 760 can be concave in the paraxial region.

[0215] The seventh lens 770 can have a negative refractive power, an object side surface of the seventh lens 770 can be convex in a paraxial region, and an image side surface of the seventh lens 770 can be concave in the paraxial region.

[0216] In addition, one or more of the sixth lens 760 and the seventh lens 770 can have at least one inflection point formed on at least one of the object side surface and the image side surface thereof.

[0217] Meanwhile, each surface of the first lens 710 to the seventh lens 770 can have an aspheric coefficient as shown in Table 14. For example, both the object side surface and the image side surface of the first lens 710 to the seventh lens 770 can be aspheric.

[0218] Table 14

[0219] In addition, the optical imaging system configured as described above can have an aberration characteristic as shown in Table 15. Figure 14

[0220] An optical imaging system 800 according to an eighth embodiment of the present disclosure will be described with reference to Figure 15 and Figure 16 An optical imaging system 800 according to an eighth embodiment of the present disclosure will be described with reference to

[0221] The optical imaging system 800 according to the eighth embodiment of the present disclosure can form a focal point on the imaging plane IP.

[0222] The optical imaging system 800 according to the eighth embodiment of the present disclosure can form a focal point on the imaging plane IP.

[0223] The lens characteristics (the radius of curvature, the thickness of the lens or the distance between the lenses, the refractive index, and the Abbe number) of each lens are shown in Table 15.

[0224] Table 15

[0225] In the eighth embodiment of the present disclosure, the first lens 810 can have a positive refractive power, the object side surface of the first lens 810 can be convex in the paraxial region, and the image side surface of the first lens 810 can be concave in the paraxial region.

[0226] The second lens 820 can have a negative refractive power, the object side surface of the second lens 820 can be convex in the paraxial region, and the image side surface of the second lens 820 can be concave in the paraxial region.

[0227] The third lens 830 can have a positive refractive power, and the object side surface and the image side surface of the third lens 830 can be convex in the paraxial region. ​

[0228] The fourth lens 840 can have a negative refractive power, and the object side surface and the image side surface of the fourth lens 840 can be concave in the paraxial region.

[0229] The fifth lens 850 can have a negative refractive power, the object side surface of the fifth lens 850 can be convex in the paraxial region, and the image side surface of the fifth lens 850 can be concave in the paraxial region.

[0230] The sixth lens 860 can have a positive refractive power, the object side surface of the sixth lens 860 can be convex in the paraxial region, and the image side surface of the sixth lens 860 can be concave in the paraxial region.

[0231] The seventh lens 870 can have a negative refractive power, the object side surface of the seventh lens 870 can be convex in the paraxial region, and the image side surface of the seventh lens 870 can be concave in the paraxial region.

[0232] In addition, one or more of the sixth lens 860 and the seventh lens 870 can have at least one inflection point formed on at least one of the object side surface and the image side surface thereof.

[0233] Meanwhile, each surface of the first lens 810 to the seventh lens 870 can have an aspheric coefficient as shown in Table 16. For example, both the object side surface and the image side surface of the first lens 810 to the seventh lens 870 can be aspheric.

[0234] Table 16

[0235] In addition, the optical imaging system configured as described above can have an aberration characteristic as shown in Table 17. Figure 16

[0236] An optical imaging system 900 according to a ninth embodiment of the disclosure will be described with reference to Figure 17 and Figure 18 An optical imaging system 900 according to a ninth embodiment of the disclosure will be described with reference to

[0237] The optical imaging system 900 according to the ninth embodiment of the disclosure can include 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, and can further include an optical filter IF and an image sensor.

[0238] The optical imaging system 900 according to the ninth embodiment of the disclosure can form a focal point on an imaging plane IP.

[0239] The lens characteristics (curvature radius, thickness of a lens or distance between lenses, refractive index, and Abbe number) of each lens are shown in Table 17.​

[0240] Table 17

[0241] In a ninth embodiment of the disclosure, the first lens 910 can have a positive refractive power, the object side surface of the first lens 910 can be convex in the paraxial region, and the image side surface of the first lens 910 can be concave in the paraxial region.

[0242] The second lens 920 can have a negative refractive power, the object side surface of the second lens 920 can be convex in the paraxial region, and the image side surface of the second lens 920 can be concave in the paraxial region.

[0243] The third lens 930 can have a positive refractive power, the object side surface of the third lens 930 can be convex in the paraxial region, and the image side surface of the third lens 930 can be concave in the paraxial region.

[0244] The fourth lens 940 can have a negative refractive power, the object side surface of the fourth lens 940 can be convex in the paraxial region, and the image side surface of the fourth lens 940 can be concave in the paraxial region.

[0245] The fifth lens 950 can have a negative refractive power, the object side surface of the fifth lens 950 can be convex in the paraxial region, and the image side surface of the fifth lens 950 can be concave in the paraxial region.

[0246] The sixth lens 960 can have a positive refractive power, the object side surface of the sixth lens 960 can be convex in the paraxial region, and the image side surface of the sixth lens 960 can be concave in the paraxial region.

[0247] The seventh lens 970 can have a negative refractive power, the object side surface of the seventh lens 970 can be convex in the paraxial region, and the image side surface of the seventh lens 970 can be concave in the paraxial region.

[0248] In addition, one or more of the sixth lens 960 and the seventh lens 970 can have at least one inflection point formed on at least one of the object side surface and the image side surface thereof.

[0249] Meanwhile, each surface of the first lens 910 to the seventh lens 970 can have an aspheric coefficient as shown in Table 18. For example, both the object side surface and the image side surface of the first lens 910 to the seventh lens 970 can be aspheric.

[0250] Table 18

[0251] In addition, the optical imaging system configured as described above can have an aberration characteristic as shown in Figure 18

[0252] An optical imaging system according to a tenth embodiment of the present disclosure will be described with reference to Figure 19 Figure 20

[0253] The optical imaging system 1000 according to the tenth embodiment of the present disclosure can include 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, and can further include a filter IF and an image sensor.

[0254] The optical imaging system 1000 according to the tenth embodiment of the present disclosure can form a focal point on an imaging plane IP.

[0255] Lens characteristics (a radius of curvature, a thickness of a lens or a distance between lenses, a refractive index, and an Abbe number) of each lens are shown in Table 19.

[0256] Table 19

[0257] In the tenth embodiment of the present disclosure, the first lens 1010 can have a positive refractive power, an object side surface of the first lens 1010 can be convex in a paraxial region, and an image side surface of the first lens 1010 can be concave in the paraxial region.

[0258] The second lens 1020 can have a negative refractive power, an object side surface of the second lens 1020 can be convex in a paraxial region, and an image side surface of the second lens 1020 can be concave in the paraxial region.

[0259] The third lens 1030 can have a positive refractive power, and an object side surface and an image side surface of the third lens 1030 can be convex in a paraxial region.

[0260] The fourth lens 1040 can have a negative refractive power, and an object side surface and an image side surface of the fourth lens 1040 can be concave in a paraxial region.

[0261] The fifth lens 1050 can have a negative refractive power, an object side surface of the fifth lens 1050 can be convex in a paraxial region, and an image side surface of the fifth lens 1050 can be concave in the paraxial region.

[0262] The sixth lens 1060 can have a positive refractive power, an object side surface of the sixth lens 1060 can be convex in a paraxial region, and an image side surface of the sixth lens 1060 can be concave in the paraxial region.

[0263] ​​​The seventh lens 1070 can have a negative refractive power, the object side surface of the seventh lens 1070 can be convex in the paraxial region, and the image side surface of the seventh lens 1070 can be concave in the paraxial region.

[0264] In addition, one or more of the sixth lens 1060 and the seventh lens 1070 can have at least one inflection point formed on at least one of the object side surface and the image side surface thereof.

[0265] Meanwhile, each surface of the first lens 1010 to the seventh lens 1070 can have an aspherical coefficient as shown in Table 20. For example, both the object side surface and the image side surface of the first lens 1010 to the seventh lens 1070 can be aspherical.

[0266] Table 20

[0267] In addition, the optical imaging system configured as described above can have an aberration characteristic as shown in Table 21. Figure 20

[0268] Table 21

[0269] In the optical imaging system according to the embodiment of the disclosure, it is possible to reduce the size while achieving high resolution.

[0270] While specific examples have been shown and described in the foregoing detailed description, various modifications to the examples will be apparent to those of ordinary skill in the art, and the general principles defined herein can be applied to other examples without the use of the inventive faculty. The examples described herein are to be understood as illustrative examples only and are not intended to limit the scope of the disclosure. Descriptions of features or aspects within each example should be considered as available for other examples unless the context explicitly dictates otherwise. Proper results can still be achieved if the described techniques are performed in a different order, and / or if the components described are combined in a different manner or replaced or supplemented by other components or their equivalents. Therefore, the scope of the disclosure is defined not by the specific embodiments described above, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are to be construed as being included in the disclosure.​

Claims

1. An optical imaging system, comprising, sequentially arranged from the object side: The first lens has positive refractive power; The second lens has negative refractive power; The third lens has positive refractive power; The fourth lens has refractive power; The fifth lens has refractive power; The sixth lens has refractive power; as well as The seventh lens has refractive power. The optical imaging system satisfies the following: 0 < f1 / f3 < 0.4, 0.5 < TTL / (2×IMG HT) < 0.58, and 160° < FOV×(2×IMG HT / f) < 180°, Where f1 is the focal length of the first lens, f3 is the focal length of the third lens, TTL is the distance along the optical axis from the object side of the first lens to the imaging plane, IMG HT is half the diagonal length of the imaging plane, FOV is the field of view of the optical imaging system, and f is the total focal length of the optical imaging system. The optical imaging system has a total of seven lenses.

2. The optical imaging system according to claim 1, wherein any one or any combination of two or more of the following conditions is met: 25 < v1-v2 < 45, 25 < v1-v4 < 45, and 15 < v1-v6 < 25. in, v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, v4 is the Abbe number of the fourth lens, and v6 is the Abbe number of the sixth lens.

3. The optical imaging system according to claim 1, wherein 0 < f1 / f < 1.

4.

4. The optical imaging system according to claim 1, satisfying -10 < f² / f < 0, in, f2 is the focal length of the second lens.

5. The optical imaging system according to claim 1, satisfying -0.6 < f1 / f2 < 0, in, f2 is the focal length of the second lens.

6. The optical imaging system according to claim 1, wherein 0 < f3 / f < 10.

7. The optical imaging system according to claim 1, satisfying -13 < f4 / f < 0, in, f4 is the focal length of the fourth lens.

8. The optical imaging system according to claim 1, wherein -15 < f5 / f < 0, in, f5 is the focal length of the fifth lens.

9. The optical imaging system according to claim 1, wherein 0 < f6 / f < 1.5, in, f6 is the focal length of the sixth lens.

10. The optical imaging system according to claim 1, wherein -0.95 < f7 / f < 0, in, f7 is the focal length of the seventh lens.

11. The optical imaging system according to claim 1, satisfying 1.0 < TTL / f < 1.3 and 0.15 < BFL / f < 0.

3. in, BFL is the distance along the optical axis from the image-side surface of the seventh lens to the imaging surface.

12. The optical imaging system according to claim 1, wherein 0 < D1 / f < 0.1, in, D1 is the distance along the optical axis from the image side of the first lens to the object side of the second lens.

13. The optical imaging system according to claim 1, satisfying 1 < Fno×(TTL / (2×IMG HT)) < 1.1, in, Fno is the F-number of the optical imaging system.

14. The optical imaging system according to claim 1, wherein, Two or more of the first to the seventh lenses have a refractive index greater than 1.6 and a negative refractive power.

15. The optical imaging system according to claim 1, wherein, The refractive indices of the fourth and fifth lenses are greater than 1.6 and less than 1.7, and, The fourth lens and the fifth lens each have negative refractive power.

16. The optical imaging system according to claim 15, wherein, Among the first lens to the seventh lens The absolute value of the focal length of one of the fourth and fifth lenses is the largest.

Images