Optical image capturing system

Abstract

The invention relates to an optical imaging system. An optical image capturing system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged in order from an object side to an image plane side, in which the fourth lens has a positive refractive power, and the eighth lens has a convex object side surface. The optical imaging system satisfies the following conditions: TTL / (2 * IMG HT) * Fnot; wherein TTL is the distance from the object side surface of the first lens to the imaging surface, IMG HT is half the diagonal length of the imaging surface, and Fno is the F value of the optical imaging system.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority from Korean Patent Application No. 10-2023-0155782 filed on November 10, 2023, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety for all purposes by reference. Technical Field

[0003] The present disclosure relates to optical imaging systems for use in mobile devices. Background Art

[0004] High performance cameras are used in mobile devices and may include relatively large image sensors having a large number of pixels.

[0005] Meanwhile, the size of the lens generally increases in proportion to the size of the image sensor. However, since the thickness of the mobile device is limited, it is difficult to manufacture a lens that matches the size of the image sensor. In addition, even if the increase in the size of the lens is minimized, it is difficult to avoid a design that may be detrimental to the aesthetics due to the thinness of the mobile device (such as a camera bump).

[0006] The above information is presented as background information only to assist in understanding the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above may be applicable as prior art with respect to the present disclosure. Summary of the invention

[0007] This Summary is provided to introduce a selection of concepts in a simplified form that are further described in the Detailed Description below. 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.

[0008] In one general aspect, an optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged in sequence from an object side to an imaging surface side, wherein the fourth lens has a positive refractive power, and the eighth lens has a convex object side surface. The optical imaging system satisfies: TTL / (2×IMG HT)×Fno<1.000, wherein TTL is the distance from the object side surface of the first lens to the imaging surface, IMG HT is half of the diagonal length of the imaging surface, and Fno is the F value of the optical imaging system.

[0009] The optical imaging system may further include a stop disposed between the third lens and the fourth lens.

[0010] The second lens and the fifth lens may have an Abbe number less than 20.

[0011] The fourth lens may have a convex object-side surface.

[0012] The fourth lens may have a convex image-side surface.

[0013] The sixth lens may have negative refractive power.

[0014] The optical imaging system satisfies: 1.100≤TTL / f≤1.200, where f is the focal length of the optical imaging system.

[0015] The third lens may have positive refractive power, and the fifth lens may have negative refractive power.

[0016] In another general aspect, an optical imaging system includes: a first lens having positive refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having refractive power; a fifth lens having negative refractive power; a sixth lens having refractive power; a seventh lens having positive refractive power; and an eighth lens having negative refractive power, wherein the first to eighth lenses are arranged in sequence from the object side to the imaging plane side, and wherein the optical imaging system satisfies: TTL / (2×IMG HT)×Fno<1.000, wherein TTL is the distance from the object side of the first lens to the imaging plane, IMG HT is half of the diagonal length of the imaging plane, and Fno is the F value of the optical imaging system.

[0017] The optical imaging system may further include an aperture stop disposed between the third lens and the fourth lens, wherein the optical imaging system satisfies: v2+v5<40, wherein v2 is the Abbe number of the second lens, and v5 is the Abbe number of the fifth lens.

[0018] The fourth lens may have positive refractive power and a convex image-side surface.

[0019] The eighth lens may have a convex object-side surface.

[0020] The fourth lens may have a convex object-side surface.

[0021] The sixth lens may have positive refractive power.

[0022] The sixth lens may have a convex object-side surface and a concave image-side surface.

[0023] The optical imaging system can satisfy: 0.500≤TTL / (2×IMG HT)<0.620.

[0024] Other features and aspects will be apparent from the following detailed description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 1B is a graph showing aberration characteristics of the optical imaging system according to the first embodiment of the present disclosure.

[0027] Figure 2A is a configuration diagram of an optical imaging system according to a second embodiment of the present disclosure.

[0028] Figure 2B is a graph showing aberration characteristics of the optical imaging system according to the second embodiment of the present disclosure.

[0029] Figure 3A is a configuration diagram of an optical imaging system according to a third embodiment of the present disclosure.

[0030] Figure 3B is a graph showing aberration characteristics of the optical imaging system according to the third embodiment of the present disclosure.

[0031] Figure 4A is a configuration diagram of an optical imaging system according to a fourth embodiment of the present disclosure.

[0032] Figure 4B is a graph showing aberration characteristics of the optical imaging system according to the fourth embodiment of the present disclosure.

[0033] Figure 5A is a configuration diagram of an optical imaging system according to a fifth embodiment of the present disclosure.

[0034] Figure 5B is a graph showing aberration characteristics of an optical imaging system according to a fifth embodiment of the present disclosure.

[0035] Fig. 6A is a configuration diagram of an optical imaging system according to a sixth embodiment of the present disclosure.

[0036] Figure 6B is a graph showing aberration characteristics of the optical imaging system according to the sixth embodiment of the present disclosure.

[0037] Fig. 7A is a configuration diagram of an optical imaging system according to a seventh embodiment of the present disclosure.

[0038] Figure 7B is a graph showing aberration characteristics of an optical imaging system according to a seventh embodiment of the present disclosure.

[0039] Fig. 8A is a configuration diagram of an optical imaging system according to an eighth embodiment of the present disclosure.

[0040] Figure 8B is a graph showing aberration characteristics of the optical imaging system according to the eighth embodiment of the present disclosure.

[0041] Fig. 9A is a configuration diagram of an optical imaging system according to a ninth embodiment of the present disclosure.

[0042] Fig. 9B is a graph showing aberration characteristics of an optical imaging system according to a ninth embodiment of the present disclosure.

[0043] Fig. 10A is a configuration diagram of an optical imaging system according to a tenth embodiment of the present disclosure.

[0044] Fig. 10B is a graph showing aberration characteristics of the optical imaging system according to the tenth embodiment of the present disclosure.

[0045] Throughout the drawings and detailed description, unless otherwise described, the same reference numerals refer to the same elements. For clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative sizes, proportions, and descriptions of the elements in the drawings may be exaggerated. DETAILED DESCRIPTION

[0046] Hereinafter, although 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 specific embodiments are provided to help the reader gain a comprehensive 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 be apparent after understanding the present disclosure. For example, the order of operations described herein is merely an example and is not limited to the order set forth herein, but may be changed as will be apparent after understanding the present disclosure, except for operations that must occur in a certain order. In addition, descriptions of features known in the art may be omitted for clarity and brevity.

[0048] The features described herein may be implemented in different forms and are not to be construed as being limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent after understanding the present disclosure.

[0049] 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”, directly “connected to”, or directly “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.

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

[0051] 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, the first member, first component, first region, first layer, or first portion mentioned in the examples described herein may also be referred to as the second member, second component, second region, second layer, or second portion without departing from the teachings of the examples.

[0052] For ease of description, spatially relative terms such as "above", "upper", "below", "lower", etc. may be used herein to describe the relationship of one element to another element as shown in the drawings. In addition to the orientation depicted in the 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 drawings is turned over, an element described as being "above" or "upper" relative to another element will then be "below" or "lower" relative to the other element. Therefore, the term "above" includes both the orientation of the above and below, depending on the spatial orientation of the device. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein will be interpreted accordingly.

[0053] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. The words "a", "an" and "the" are intended to include plural forms as well, unless the context clearly indicates otherwise. The terms "include", "comprises" and "have" specify the presence of stated features, quantities, operations, components, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements and / or combinations thereof.

[0054] 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 shape variations that occur during manufacturing.

[0055] Herein, it is noted that the use of the term “may” with respect to an example, such as with respect to what an example may include or implement, means that there is at least one example that includes or implements this feature, and all examples are not limited thereto.

[0056] As will be apparent after understanding the present disclosure, the features of the examples described herein may be combined in various ways. In addition, although the examples described herein have multiple configurations, other configurations are also possible, as will be apparent after understanding the present disclosure.

[0057] In this specification, the values ​​of the units of the radius of curvature, thickness, gap or distance, focal length, IMG HT (1 / 2 of the diagonal length of the imaging surface), effective radius (semi-aperture), etc. of the lens are expressed in millimeters (mm), and the unit of the field of view (FOV) is degrees. In addition, the thickness of the lens and the gap between the lenses may refer to the thickness and gap on the optical axis, respectively.

[0058] In this specification, the object side may indicate a direction in which an object is located, and the image side may indicate, for example, a direction in which an imaging plane on which an image is formed is located or a direction in which an image sensor is located.

[0059] In the description of the shape of a lens in this specification, a convex shape on one surface means that the paraxial region (a very narrow region near the optical axis) portion of the surface is convex, and a concave shape on one surface means that the paraxial region portion of the surface is concave. Therefore, even in the case where one surface of a lens is described as having a convex shape, the edge portion of the lens may be concave. Similarly, even in the case where one surface of a lens is described as having a concave shape, the edge portion of the lens may be convex.

[0060] According to an embodiment of the present disclosure, an optical imaging system may be employed in a camera of a mobile device. The mobile device may be any type of portable electronic device, such as a mobile communication terminal, a smart phone, a tablet PC, and the like.

[0061] In an embodiment of the present disclosure, the optical imaging system may include eight lenses. For example, the optical imaging system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged in sequence from the object side.

[0062] In addition, the optical imaging system may be composed not only of a plurality of lenses but may also include an image sensor that converts incident light into an electrical signal, an infrared cut filter that blocks light in the infrared region from being incident on the image sensor, and an aperture that adjusts the amount of incident light.

[0063] In an embodiment of the present disclosure, the optical imaging system may include a lens formed of a plastic material. For example, at least some of the first to eighth lenses may be formed of a plastic material. In an example, all of the first to eighth lenses may be formed of a plastic material.

[0064] In an embodiment of the present disclosure, the optical imaging system may include an aspherical lens. For example, at least one of the first lens to the eighth lens may be an aspherical lens, and at least one of the first lens to the eighth lens may have an aspherical surface, for example, at least one of the object side and the image side may have an aspherical surface. The aspherical surface of the lens may be represented by Formula 1.

[0065] Formula 1:

[0066]

[0067] In Formula 1, c is the inverse of the radius of curvature of the lens, K is the cone constant, and Y is the distance from any point on the aspherical surface to the optical axis. In addition, constants A to H and J are aspherical surface constants in the order of 4th to 20th order, and Z is the distance from a certain point on the aspherical surface to the vertex of the corresponding aspherical surface in the optical axis direction.

[0068] In an embodiment of the present disclosure, the optical imaging system may satisfy the following conditional expression:

[0069] Conditional expression 1: 1.100 ≤ TTL / f ≤ 1.200

[0070] Conditional expression 2: 0.500≤TTL / (2×IMG HT)<0.620

[0071] Conditional expression 3: TTL / (2×IMG HT)×Fno<1.000

[0072] Conditional expression 4: v2+v5<40

[0073] Conditional Expression 5: 10 <T56 / T12

[0074] Conditional expression 6: 1.400 <R6 / f

[0075] In Conditional Expression 1, TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, and f is the focal length of the optical imaging system. Conditional Expression 1 may be related to the small size characteristic of the optical imaging system according to an embodiment of the present disclosure.

[0076] In Conditional Expression 2, TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, and IMGHT is half the diagonal length of the imaging surface (2×IMGHT is the diagonal length of the imaging surface). Conditional Expression 2 may be related to the characteristic that the size of the optical imaging system according to an embodiment of the present disclosure is small compared to the size of the image sensor.

[0077] In Conditional Expression 3, Fno is the F value of the optical imaging system. Conditional Expression 3 may be related to the size and brightness characteristics of the optical imaging system according to the embodiment of the present disclosure.

[0078] In Conditional Expression 4, v2 and v5 are Abbe numbers of the second lens and the fifth lens, respectively. Conditional Expression 4 may be related to a design condition for improving chromatic aberration correction performance of the optical imaging system according to an embodiment of the present disclosure.

[0079] In Conditional Expression 5, T12 is the spacing between the first lens and the second lens, and T56 is the spacing between the fifth lens and the sixth lens. Conditional Expression 5 may be related to a design condition for manufacturing an optical imaging system according to an embodiment of the present disclosure, which has a small size compared to the size of the image sensor. The spacing between the first lens and the second lens may be reduced to reduce the total length while maintaining chromatic aberration correction performance.

[0080] In Conditional Expression 6, R6 is the curvature radius of the image side surface of the third lens, and f is the focal length of the optical imaging system. Conditional Expression 6 may be related to a shape condition of the third lens that may reduce the size of the optical imaging system according to an embodiment of the present disclosure.

[0081] Hereinafter, an optical imaging system according to an embodiment of the present disclosure will be described with reference to the accompanying drawings.

[0082] First embodiment:

[0083] Figure 1A is a configuration diagram of an optical imaging system according to a first embodiment of the present disclosure. Figure 1B is a graph showing aberration characteristics of the optical imaging system according to the first embodiment of the present disclosure.

[0084] According to the first embodiment, the optical imaging 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, a seventh lens 170, and an eighth lens 180 arranged in sequence from the object side, and may further include an infrared cut filter F and an image sensor (imaging surface IP) arranged on the image side of the eighth lens 180. In addition, the optical imaging system 100 may further include a stop ST disposed between the third lens 130 and the fourth lens 140.

[0085] The first lens 110 may have a positive refractive power. The object side surface of the first lens 110 may be convex in the paraxial region, and the image side surface of the first lens 110 may be concave in the paraxial region. The first lens 110 may be formed of a plastic material. In addition, the first lens 110 may be an aspherical lens. For example, the first lens 110 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0086] The second lens 120 may have a negative refractive power. The object side surface of the second lens 120 may be convex in the paraxial region, and the image side surface of the second lens 120 may be concave in the paraxial region. The second lens 120 may be formed of a plastic material. For example, the second lens 120 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the first lens 110. In an example, the Abbe number of the second lens 120 may be less than 20. In addition, the second lens 120 may be an aspherical lens. For example, the second lens 120 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0087] The third lens 130 may have positive refractive power. The object side surface of the third lens 130 may be convex in the paraxial region, and the image side surface of the third lens 130 may be concave in the paraxial region. The third lens 130 may be formed of a plastic material. For example, the third lens 130 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the second lens 120. In addition, the third lens 130 may be an aspherical lens. For example, the third lens 130 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0088] The fourth lens 140 may have positive refractive power. The object side surface of the fourth lens 140 may be concave in the paraxial region, and the image side surface of the fourth lens 140 may be convex in the paraxial region. The fourth lens 140 may be formed of a plastic material. For example, the fourth lens 140 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the third lens 130. In addition, the fourth lens 140 may be an aspherical lens. For example, the fourth lens 140 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0089] The fifth lens 150 may have a negative refractive power. The object side surface of the fifth lens 150 may be convex in the paraxial region, and the image side surface of the fifth lens 150 may be concave in the paraxial region. The fifth lens 150 may be formed of a plastic material. For example, the fifth lens 150 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the fourth lens 140, and in an example, the Abbe number of the fifth lens 150 may be less than 20. In addition, the fifth lens 150 may be an aspherical lens. For example, the fifth lens 150 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0090] The sixth lens 160 may have a negative refractive power. The object side surface of the sixth lens 160 may be convex in the paraxial region, and the image side surface of the sixth lens 160 may be concave in the paraxial region. The sixth lens 160 may be formed of a plastic material. For example, the sixth lens 160 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the fifth lens 150. In addition, the sixth lens 160 may be an aspherical lens. For example, the sixth lens 160 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0091] The seventh lens 170 may have positive refractive power. The object side surface of the seventh lens 170 may be convex in the paraxial region, and the image side surface of the seventh lens 170 may be concave in the paraxial region. The seventh lens 170 may be formed of a plastic material. For example, the seventh lens 170 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the sixth lens 160. In addition, the seventh lens 170 may be an aspherical lens. For example, the seventh lens 170 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0092] The eighth lens 180 may have negative refractive power. The object side surface of the eighth lens 180 may be convex in the paraxial region, and the image side surface of the eighth lens 180 may be concave in the paraxial region. The eighth lens 180 may be formed of a plastic material. For example, the eighth lens 180 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the seventh lens 170. In addition, the eighth lens 180 may be an aspherical lens. For example, the eighth lens 180 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0093] Table 1 below shows optical and physical parameters of the optical imaging system 100 according to the first embodiment of the present disclosure.

[0094] Table 1:

[0095]

[0096]

[0097] Table 2 below shows aspherical surface data of the optical imaging system 100 according to the first embodiment of the present disclosure.

[0098] Table 2:

[0099]

[0100]

[0101] Second implementation method:

[0102] Figure 2A is a configuration diagram of an optical imaging system according to a second embodiment of the present disclosure. Figure 2B is a graph showing aberration characteristics of the optical imaging system according to the second embodiment of the present disclosure.

[0103] According to the second embodiment, the optical imaging 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, a seventh lens 270, and an eighth lens 280 arranged in sequence from the object side, and may further include an infrared cut filter F and an image sensor (imaging surface IP) arranged on the image side of the eighth lens 280. In addition, the optical imaging system 200 may further include a stop ST disposed between the third lens 230 and the fourth lens 240.

[0104] The first lens 210 may have a positive refractive power. The object side surface of the first lens 210 may be convex in the paraxial region, and the image side surface of the first lens 210 may be concave in the paraxial region. The first lens 210 may be formed of a plastic material. In addition, the first lens 210 may be an aspherical lens. For example, the first lens 210 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0105] The second lens 220 may have a negative refractive power. The object side surface of the second lens 220 may be convex in the paraxial region, and the image side surface of the second lens 220 may be concave in the paraxial region. The second lens 220 may be formed of a plastic material. For example, the second lens 220 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the first lens 210, and in an example, the Abbe number of the second lens 220 may be less than 20. In addition, the second lens 220 may be an aspherical lens. For example, the second lens 220 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0106] The third lens 230 may have positive refractive power. The object side surface of the third lens 230 may be convex in the paraxial region, and the image side surface of the third lens 230 may be concave in the paraxial region. The third lens 230 may be formed of a plastic material. For example, the third lens 230 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the second lens 220. In addition, the third lens 230 may be an aspherical lens. For example, the third lens 230 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0107] The fourth lens 240 may have positive refractive power. The object side surface of the fourth lens 240 may be concave in the paraxial region, and the image side surface of the fourth lens 240 may be convex in the paraxial region. The fourth lens 240 may be formed of a plastic material. For example, the fourth lens 240 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the third lens 230. In addition, the fourth lens 240 may be an aspherical lens. For example, the fourth lens 240 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0108] The fifth lens 250 may have a negative refractive power. The object side surface of the fifth lens 250 may be convex in the paraxial region, and the image side surface of the fifth lens 250 may be concave in the paraxial region. The fifth lens 250 may be formed of a plastic material. For example, the fifth lens 250 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the fourth lens 240, and in an example, the Abbe number of the fifth lens 250 may be less than 20. In addition, the fifth lens 250 may be an aspherical lens. For example, the fifth lens 250 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0109] The sixth lens 260 may have a negative refractive power. The object side surface of the sixth lens 260 may be convex in the paraxial region, and the image side surface of the sixth lens 260 may be concave in the paraxial region. The sixth lens 260 may be formed of a plastic material. For example, the sixth lens 260 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the fifth lens 250. In addition, the sixth lens 260 may be an aspherical lens. For example, the sixth lens 260 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0110] The seventh lens 270 may have positive refractive power. The object side surface of the seventh lens 270 may be convex in the paraxial region, and the image side surface of the seventh lens 270 may be concave in the paraxial region. The seventh lens 270 may be formed of a plastic material. For example, the seventh lens 270 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the sixth lens 260. In addition, the seventh lens 270 may be an aspherical lens. For example, the seventh lens 270 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0111] The eighth lens 280 may have a negative refractive power. The object side surface of the eighth lens 280 may be convex in the paraxial region, and the image side surface of the eighth lens 280 may be concave in the paraxial region. The eighth lens 280 may be formed of a plastic material. For example, the eighth lens 280 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the seventh lens 270. In addition, the eighth lens 280 may be an aspherical lens. For example, the eighth lens 280 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0112] Table 3 below shows optical and physical parameters of the optical imaging system 200 according to the second embodiment of the present disclosure.

[0113] Table 3:

[0114]

[0115]

[0116] Table 4 below shows aspherical surface data of the optical imaging system 200 according to the second embodiment of the present disclosure.

[0117] Table 4:

[0118]

[0119]

[0120] Third embodiment:

[0121] Figure 3A is a configuration diagram of an optical imaging system according to a third embodiment of the present disclosure. Figure 3B is a graph showing aberration characteristics of the optical imaging system according to the third embodiment of the present disclosure.

[0122] According to the third embodiment, the optical imaging 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, a seventh lens 370, and an eighth lens 380 arranged in sequence from the object side, and may further include an infrared cut filter F and an image sensor (imaging surface IP) arranged on the image side of the eighth lens 380. In addition, the optical imaging system 300 may further include a stop ST disposed between the third lens 330 and the fourth lens 340.

[0123] The first lens 310 may have a positive refractive power. The object side surface of the first lens 310 may be convex in the paraxial region, and the image side surface of the first lens 310 may be concave in the paraxial region. The first lens 310 may be formed of a plastic material. In addition, the first lens 310 may be an aspherical lens. For example, the first lens 310 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0124] The second lens 320 may have a negative refractive power. The object side surface of the second lens 320 may be convex in the paraxial region, and the image side surface of the second lens 320 may be concave in the paraxial region. The second lens 320 may be formed of a plastic material. For example, the second lens 320 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the first lens 310, and in an example, the Abbe number of the second lens 320 may be less than 20. In addition, the second lens 320 may be an aspherical lens. For example, the second lens 320 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0125] The third lens 330 may have positive refractive power. The object side surface of the third lens 330 may be convex in the paraxial region, and the image side surface of the third lens 330 may be concave in the paraxial region. The third lens 330 may be formed of a plastic material. For example, the third lens 330 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the second lens 320. In addition, the third lens 330 may be an aspherical lens. For example, the third lens 330 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0126] The fourth lens 340 may have positive refractive power. The object side surface of the fourth lens 340 may be concave in the paraxial region, and the image side surface of the fourth lens 340 may be convex in the paraxial region. The fourth lens 340 may be formed of a plastic material. For example, the fourth lens 340 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the third lens 330. In addition, the fourth lens 340 may be an aspherical lens. For example, the fourth lens 340 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0127] The fifth lens 350 may have a negative refractive power. The object side surface of the fifth lens 350 may be convex in the paraxial region, and the image side surface of the fifth lens 350 may be concave in the paraxial region. The fifth lens 350 may be formed of a plastic material. For example, the fifth lens 350 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the fourth lens 340, and in an example, the Abbe number of the fifth lens 350 may be less than 20. In addition, the fifth lens 350 may be an aspherical lens. For example, the fifth lens 350 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0128] The sixth lens 360 may have a negative refractive power. The object side surface of the sixth lens 360 may be convex in the paraxial region, and the image side surface of the sixth lens 360 may be concave in the paraxial region. The sixth lens 360 may be formed of a plastic material. For example, the sixth lens 360 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the fifth lens 350. In addition, the sixth lens 360 may be an aspherical lens. For example, the sixth lens 360 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0129] The seventh lens 370 may have positive refractive power. The object side surface of the seventh lens 370 may be convex in the paraxial region, and the image side surface of the seventh lens 370 may be concave in the paraxial region. The seventh lens 370 may be formed of a plastic material. For example, the seventh lens 370 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the sixth lens 360. In addition, the seventh lens 370 may be an aspherical lens. For example, the seventh lens 370 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0130] The eighth lens 380 may have a negative refractive power. The object side surface of the eighth lens 380 may be convex in the paraxial region, and the image side surface of the eighth lens 380 may be concave in the paraxial region. The eighth lens 380 may be formed of a plastic material. For example, the eighth lens 380 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the seventh lens 370. In addition, the eighth lens 380 may be an aspherical lens. For example, the eighth lens 380 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0131] Table 5 below shows optical and physical parameters of the optical imaging system 300 according to the third embodiment of the present disclosure.

[0132] Table 5:

[0133]

[0134]

[0135] Table 6 below shows aspherical surface data of the optical imaging system 300 according to the third embodiment of the present disclosure.

[0136] Table 6:

[0137]

[0138]

[0139] Fourth embodiment:

[0140] Figure 4A is a configuration diagram of an optical imaging system according to a fourth embodiment of the present disclosure. Figure 4B is a graph showing aberration characteristics of the optical imaging system according to the fourth embodiment of the present disclosure.

[0141] According to the fourth embodiment, the optical imaging 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, a seventh lens 470, and an eighth lens 480 arranged in sequence from the object side, and may further include an infrared cut filter F and an image sensor (imaging surface IP) arranged on the image side of the eighth lens 480. In addition, the optical imaging system 400 may further include a stop ST disposed between the third lens 430 and the fourth lens 440.

[0142] The first lens 410 may have a positive refractive power. The object side surface of the first lens 410 may be convex in the paraxial region, and the image side surface of the first lens 410 may be concave in the paraxial region. The first lens 410 may be formed of a plastic material. In addition, the first lens 410 may be an aspherical lens. For example, the first lens 410 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0143] The second lens 420 may have a negative refractive power. The object side surface of the second lens 420 may be convex in the paraxial region, and the image side surface of the second lens 420 may be concave in the paraxial region. The second lens 420 may be formed of a plastic material. For example, the second lens 420 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the first lens 410, and in an example, the Abbe number of the second lens 420 may be less than 20. In addition, the second lens 420 may be an aspherical lens. For example, the second lens 420 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0144] The third lens 430 may have a positive refractive power. The object side surface of the third lens 430 may be convex in the paraxial region, and the image side surface of the third lens 430 may be concave in the paraxial region. The third lens 430 may be formed of a plastic material. For example, the third lens 430 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the second lens 420. In addition, the third lens 430 may be an aspherical lens. For example, the third lens 430 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0145] The fourth lens 440 may have positive refractive power. The object side surface of the fourth lens 440 may be concave in the paraxial region, and the image side surface of the fourth lens 440 may be convex in the paraxial region. The fourth lens 440 may be formed of a plastic material. For example, the fourth lens 440 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the third lens 430. In addition, the fourth lens 440 may be an aspherical lens. For example, the fourth lens 440 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0146] The fifth lens 450 may have a negative refractive power. The object side surface of the fifth lens 450 may be convex in the paraxial region, and the image side surface of the fifth lens 450 may be concave in the paraxial region. The fifth lens 450 may be formed of a plastic material. For example, the fifth lens 450 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the fourth lens 440, and in an example, the Abbe number of the fifth lens 450 may be less than 20. In addition, the fifth lens 450 may be an aspherical lens. For example, the fifth lens 450 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0147] The sixth lens 460 may have a positive refractive power. The object side surface of the sixth lens 460 may be convex in the paraxial region, and the image side surface of the sixth lens 460 may be concave in the paraxial region. The sixth lens 460 may be formed of a plastic material. For example, the sixth lens 460 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the fifth lens 450. In addition, the sixth lens 460 may be an aspherical lens. For example, the sixth lens 460 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0148] The seventh lens 470 may have positive refractive power. The object side surface of the seventh lens 470 may be convex in the paraxial region, and the image side surface of the seventh lens 470 may be concave in the paraxial region. The seventh lens 470 may be formed of a plastic material. For example, the seventh lens 470 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the sixth lens 460. In addition, the seventh lens 470 may be an aspherical lens. For example, the seventh lens 470 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0149] The eighth lens 480 may have a negative refractive power. The object side surface of the eighth lens 480 may be convex in the paraxial region, and the image side surface of the eighth lens 480 may be concave in the paraxial region. The eighth lens 480 may be formed of a plastic material. For example, the eighth lens 480 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the seventh lens 470. In addition, the eighth lens 480 may be an aspherical lens. For example, the eighth lens 480 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0150] Table 7 below shows optical and physical parameters of the optical imaging system 400 according to the fourth embodiment of the present disclosure.

[0151] Table 7:

[0152] Face number Radius of curvature Thickness / distance Refractive Index Abbe number Effective diameter object infinity infinity 1 2.332 0.988 1.546 55.990 1.844 2 11.579 0.050 1.790 3 10.158 0.220 1.677 19.238 1.720 4 4.283 0.269 1.564 5 6.923 0.342 1.570 37.403 1.536 6 10.722 0.145 1.444 Aperture infinity 0.191 1.428 7 -81.376 0.284 1.546 55.990 1.473 8 -22.406 0.373 1.644 9 7.846 0.220 1.677 19.238 1.776 10 5.812 0.605 2.055 11 9.196 0.380 1.570 37.403 2.365 12 9.169 0.205 2.631 13 3.031 0.480 1.546 55.990 3.189 14 5.897 0.694 3.417 15 409.111 0.480 1.537 55.735 4.238 16 2.736 0.500 4.435 17 infinity 0.210 1.518 64.197 18 infinity 0.324 Imaging surface infinity

[0153] Table 8 below shows aspherical surface data of the optical imaging system 400 according to the fourth embodiment of the present disclosure.

[0154] Table 8:

[0155]

[0156] Fifth embodiment:

[0157] Figure 5A is a configuration diagram of an optical imaging system according to a fifth embodiment of the present disclosure. Figure 5B is a graph showing aberration characteristics of an optical imaging system according to a fifth embodiment of the present disclosure.

[0158] According to the fifth embodiment, the optical imaging 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, a seventh lens 570, and an eighth lens 580 arranged in sequence from the object side, and may further include an infrared cut filter F and an image sensor (imaging surface IP) arranged on the image side of the eighth lens 580. In addition, the optical imaging system 500 may further include a stop ST disposed between the third lens 530 and the fourth lens 540.

[0159] The first lens 510 may have a positive refractive power. The object side surface of the first lens 510 may be convex in the paraxial region, and the image side surface of the first lens 510 may be concave in the paraxial region. The first lens 510 may be formed of a plastic material. In addition, the first lens 510 may be an aspherical lens. For example, the first lens 510 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0160] The second lens 520 may have a negative refractive power. The object side surface of the second lens 520 may be convex in the paraxial region, and the image side surface of the second lens 520 may be concave in the paraxial region. The second lens 520 may be formed of a plastic material. For example, the second lens 520 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the first lens 510, and in an example, the Abbe number of the second lens 520 may be less than 20. In addition, the second lens 520 may be an aspherical lens. For example, the second lens 520 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0161] The third lens 530 may have positive refractive power. The object side surface of the third lens 530 may be convex in the paraxial region, and the image side surface of the third lens 530 may be concave in the paraxial region. The third lens 530 may be formed of a plastic material. For example, the third lens 530 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the second lens 520. In addition, the third lens 530 may be an aspherical lens. For example, the third lens 530 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0162] The fourth lens 540 may have positive refractive power. Both the object side and the image side of the fourth lens 540 may be convex in the paraxial region. The fourth lens 540 may be formed of a plastic material. For example, the fourth lens 540 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the third lens 530. In addition, the fourth lens 540 may be an aspherical lens. For example, the fourth lens 540 may be a double-sided aspherical lens, both the object side and the image side being aspherical.

[0163] The fifth lens 550 may have a negative refractive power. The object side surface of the fifth lens 550 may be convex in the paraxial region, and the image side surface of the fifth lens 550 may be concave in the paraxial region. The fifth lens 550 may be formed of a plastic material. For example, the fifth lens 550 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the fourth lens 540, and in an example, the Abbe number of the fifth lens 550 may be less than 20. In addition, the fifth lens 550 may be an aspherical lens. For example, the fifth lens 550 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0164] The sixth lens 560 may have a negative refractive power. The object side surface of the sixth lens 560 may be convex in the paraxial region, and the image side surface of the sixth lens 560 may be concave in the paraxial region. The sixth lens 560 may be formed of a plastic material. For example, the sixth lens 560 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the fifth lens 550. In addition, the sixth lens 560 may be an aspherical lens. For example, the sixth lens 560 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0165] The seventh lens 570 may have positive refractive power. The object side surface of the seventh lens 570 may be convex in the paraxial region, and the image side surface of the seventh lens 570 may be concave in the paraxial region. The seventh lens 570 may be formed of a plastic material. For example, the seventh lens 570 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the sixth lens 560. In addition, the seventh lens 570 may be an aspherical lens. For example, the seventh lens 570 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0166] The eighth lens 580 may have a negative refractive power. The object side surface of the eighth lens 580 may be convex in the paraxial region, and the image side surface of the eighth lens 580 may be concave in the paraxial region. The eighth lens 580 may be formed of a plastic material. For example, the eighth lens 580 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the seventh lens 570. In addition, the eighth lens 580 may be an aspherical lens. For example, the eighth lens 580 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0167] Table 9 below shows optical and physical parameters of the optical imaging system 500 according to the fifth embodiment of the present disclosure.

[0168] Table 9:

[0169]

[0170]

[0171] Table 10 below shows aspherical surface data of the optical imaging system 500 according to the fifth embodiment of the present disclosure.

[0172] Table 10:

[0173]

[0174]

[0175] Sixth embodiment:

[0176] Fig. 6A is a configuration diagram of an optical imaging system according to a sixth embodiment of the present disclosure. Figure 6B is a graph showing aberration characteristics of the optical imaging system according to the sixth embodiment of the present disclosure.

[0177] According to the sixth embodiment, the optical imaging 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, a seventh lens 670, and an eighth lens 680 arranged in sequence from the object side, and may further include an infrared cut filter F and an image sensor (imaging surface IP) arranged on the image side of the eighth lens 680. In addition, the optical imaging system 600 may further include a stop ST disposed between the third lens 630 and the fourth lens 640.

[0178] The first lens 610 may have a positive refractive power. The object side surface of the first lens 610 may be convex in the paraxial region, and the image side surface of the first lens 610 may be concave in the paraxial region. The first lens 610 may be formed of a plastic material. In addition, the first lens 610 may be an aspherical lens. For example, the first lens 610 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0179] The second lens 620 may have a negative refractive power. The object side surface of the second lens 620 may be convex in the paraxial region, and the image side surface of the second lens 620 may be concave in the paraxial region. The second lens 620 may be formed of a plastic material. For example, the second lens 620 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the first lens 610, and in an example, the Abbe number of the second lens 620 may be less than 20. In addition, the second lens 620 may be an aspherical lens. For example, the second lens 620 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0180] The third lens 630 may have positive refractive power. The object side surface of the third lens 630 may be convex in the paraxial region, and the image side surface of the third lens 630 may be concave in the paraxial region. The third lens 630 may be formed of a plastic material. For example, the third lens 630 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the second lens 620. In addition, the third lens 630 may be an aspherical lens. For example, the third lens 630 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0181] The fourth lens 640 may have positive refractive power. Both the object side and the image side of the fourth lens 640 may be convex in the paraxial region. The fourth lens 640 may be formed of a plastic material. For example, the fourth lens 640 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the third lens 630. In addition, the fourth lens 640 may be an aspherical lens. For example, the fourth lens 640 may be a double-sided aspherical lens, both the object side and the image side being aspherical.

[0182] The fifth lens 650 may have a negative refractive power. The object side surface of the fifth lens 650 may be convex in the paraxial region, and the image side surface of the fifth lens 650 may be concave in the paraxial region. The fifth lens 650 may be formed of a plastic material. For example, the fifth lens 650 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the fourth lens 640, and in an example, the Abbe number of the fifth lens 650 may be less than 20. In addition, the fifth lens 650 may be an aspherical lens. For example, the fifth lens 650 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0183] The sixth lens 660 may have a negative refractive power. The object side surface of the sixth lens 660 may be convex in the paraxial region, and the image side surface of the sixth lens 660 may be concave in the paraxial region. The sixth lens 660 may be formed of a plastic material. For example, the sixth lens 660 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the fifth lens 650. In addition, the sixth lens 660 may be an aspherical lens. For example, the sixth lens 660 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0184] The seventh lens 670 may have positive refractive power. The object side surface of the seventh lens 670 may be convex in the paraxial region, and the image side surface of the seventh lens 670 may be concave in the paraxial region. The seventh lens 670 may be formed of a plastic material. For example, the seventh lens 670 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the sixth lens 660. In addition, the seventh lens 670 may be an aspherical lens. For example, the seventh lens 670 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0185] The eighth lens 680 may have negative refractive power. Both the object side and the image side of the eighth lens 680 may be concave in the paraxial region. The eighth lens 680 may be formed of a plastic material. For example, the eighth lens 680 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the seventh lens 670. In addition, the eighth lens 680 may be an aspherical lens. For example, the eighth lens 680 may be a double-sided aspherical lens, both the object side and the image side being aspherical.

[0186] Table 11 below shows optical and physical parameters of the optical imaging system 600 according to the sixth embodiment of the present disclosure.

[0187] Table 11:

[0188]

[0189]

[0190] Table 12 below shows aspherical surface data of the optical imaging system 600 according to the sixth embodiment of the present disclosure.

[0191] Table 12:

[0192]

[0193]

[0194] Seventh embodiment:

[0195] Fig. 7A is a configuration diagram of an optical imaging system according to a seventh embodiment of the present disclosure. Figure 7B is a graph showing aberration characteristics of an optical imaging system according to a seventh embodiment of the present disclosure.

[0196] According to the seventh embodiment, the optical imaging system 700 may 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, a seventh lens 770, and an eighth lens 780 arranged in sequence from the object side, and may further include an infrared cut filter F and an image sensor (imaging surface IP) arranged on the image side of the eighth lens 780. In addition, the optical imaging system 700 may further include a stop ST disposed between the third lens 730 and the fourth lens 740.

[0197] The first lens 710 may have a positive refractive power. The object side surface of the first lens 710 may be convex in the paraxial region, and the image side surface of the first lens 710 may be concave in the paraxial region. The first lens 710 may be formed of a plastic material. In addition, the first lens 710 may be an aspherical lens. For example, the first lens 710 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0198] The second lens 720 may have a negative refractive power. The object side surface of the second lens 720 may be convex in the paraxial region, and the image side surface of the second lens 720 may be concave in the paraxial region. The second lens 720 may be formed of a plastic material. For example, the second lens 720 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the first lens 710, and in an example, the Abbe number of the second lens 720 may be less than 20. In addition, the second lens 720 may be an aspherical lens. For example, the second lens 720 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0199] The third lens 730 may have positive refractive power. The object side surface of the third lens 730 may be convex in the paraxial region, and the image side surface of the third lens 730 may be concave in the paraxial region. The third lens 730 may be formed of a plastic material. For example, the third lens 730 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the second lens 720. In addition, the third lens 730 may be an aspherical lens. For example, the third lens 730 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0200] The fourth lens 740 may have positive refractive power. The object side surface of the fourth lens 740 may be convex in the paraxial region, and the image side surface of the fourth lens 740 may be concave in the paraxial region. The fourth lens 740 may be formed of a plastic material. For example, the fourth lens 740 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the third lens 730. In addition, the fourth lens 740 may be an aspherical lens. For example, the fourth lens 740 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0201] The fifth lens 750 may have a negative refractive power. The object side surface of the fifth lens 750 may be convex in the paraxial region, and the image side surface of the fifth lens 750 may be concave in the paraxial region. The fifth lens 750 may be formed of a plastic material. For example, the fifth lens 750 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the fourth lens 740, and in an example, the Abbe number of the fifth lens 750 may be less than 20. In addition, the fifth lens 750 may be an aspherical lens. For example, the fifth lens 750 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0202] The sixth lens 760 may have a negative refractive power. The object side surface of the sixth lens 760 may be convex in the paraxial region, and the image side surface of the sixth lens 760 may be concave in the paraxial region. The sixth lens 760 may be formed of a plastic material. For example, the sixth lens 760 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the fifth lens 750. In addition, the sixth lens 760 may be an aspherical lens. For example, the sixth lens 760 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0203] The seventh lens 770 may have positive refractive power. The object side surface of the seventh lens 770 may be convex in the paraxial region, and the image side surface of the seventh lens 770 may be concave in the paraxial region. The seventh lens 770 may be formed of a plastic material. For example, the seventh lens 770 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the sixth lens 760. In addition, the seventh lens 770 may be an aspherical lens. For example, the seventh lens 770 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0204] The eighth lens 780 may have negative refractive power. The object side surface of the eighth lens 780 may be convex in the paraxial region, and the image side surface of the eighth lens 780 may be concave in the paraxial region. The eighth lens 780 may be formed of a plastic material. For example, the eighth lens 780 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the seventh lens 770. In addition, the eighth lens 780 may be an aspherical lens. For example, the eighth lens 780 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0205] Table 13 below shows optical and physical parameters of the optical imaging system 700 according to the seventh embodiment of the present disclosure.

[0206] Table 13:

[0207]

[0208]

[0209] Table 14 below shows aspherical surface data of the optical imaging system 700 according to the seventh embodiment of the present disclosure.

[0210] Table 14:

[0211]

[0212]

[0213] Eighth embodiment:

[0214] Fig. 8A is a configuration diagram of an optical imaging system according to an eighth embodiment of the present disclosure. Figure 8B is a graph showing aberration characteristics of the optical imaging system according to the eighth embodiment of the present disclosure.

[0215] According to the eighth embodiment, the optical imaging system 800 may include a first lens 810, a second lens 820, a third lens 830, a fourth lens 840, a fifth lens 850, a sixth lens 860, a seventh lens 870, and an eighth lens 880 arranged in sequence from the object side, and may further include an infrared cut filter F and an image sensor (imaging surface IP) arranged on the image side of the eighth lens 880. In addition, the optical imaging system 800 may further include a stop ST disposed between the third lens 830 and the fourth lens 840.

[0216] The first lens 810 may have a positive refractive power. The object side surface of the first lens 810 may be convex in the paraxial region, and the image side surface of the first lens 810 may be concave in the paraxial region. The first lens 810 may be formed of a plastic material. In addition, the first lens 810 may be an aspherical lens. For example, the first lens 810 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0217] The second lens 820 may have a negative refractive power. The object side surface of the second lens 820 may be convex in the paraxial region, and the image side surface of the second lens 820 may be concave in the paraxial region. The second lens 820 may be formed of a plastic material. For example, the second lens 820 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the first lens 810, and in an example, the Abbe number of the second lens 820 may be less than 20. In addition, the second lens 820 may be an aspherical lens. For example, the second lens 820 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0218] The third lens 830 may have positive refractive power. The object side surface of the third lens 830 may be convex in the paraxial region, and the image side surface of the third lens 830 may be concave in the paraxial region. The third lens 830 may be formed of a plastic material. For example, the third lens 830 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the second lens 820. In addition, the third lens 830 may be an aspherical lens. For example, the third lens 830 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0219] The fourth lens 840 may have positive refractive power. The object side surface of the fourth lens 840 may be convex in the paraxial region, and the image side surface of the fourth lens 840 may be concave in the paraxial region. The fourth lens 840 may be formed of a plastic material. For example, the fourth lens 840 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the third lens 830. In addition, the fourth lens 840 may be an aspherical lens. For example, the fourth lens 840 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0220] The fifth lens 850 may have a negative refractive power. The object side surface of the fifth lens 850 may be convex in the paraxial region, and the image side surface of the fifth lens 850 may be concave in the paraxial region. The fifth lens 850 may be formed of a plastic material. For example, the fifth lens 850 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the fourth lens 840, and in an example, the Abbe number of the fifth lens 850 may be less than 20. In addition, the fifth lens 850 may be an aspherical lens. For example, the fifth lens 850 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0221] The sixth lens 860 may have a negative refractive power. The object side surface of the sixth lens 860 may be convex in the paraxial region, and the image side surface of the sixth lens 860 may be concave in the paraxial region. The sixth lens 860 may be formed of a plastic material. For example, the sixth lens 860 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the fifth lens 850. In addition, the sixth lens 860 may be an aspherical lens. For example, the sixth lens 860 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0222] The seventh lens 870 may have positive refractive power. The object side surface of the seventh lens 870 may be convex in the paraxial region, and the image side surface of the seventh lens 870 may be concave in the paraxial region. The seventh lens 870 may be formed of a plastic material. For example, the seventh lens 870 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the sixth lens 860. In addition, the seventh lens 870 may be an aspherical lens. For example, the seventh lens 870 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0223] The eighth lens 880 may have negative refractive power. The object side surface of the eighth lens 880 may be convex in the paraxial region, and the image side surface of the eighth lens 880 may be concave in the paraxial region. The eighth lens 880 may be formed of a plastic material. For example, the eighth lens 880 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the seventh lens 870. In addition, the eighth lens 880 may be an aspherical lens. For example, the eighth lens 880 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0224] Table 15 below shows optical and physical parameters of the optical imaging system 800 according to the eighth embodiment of the present disclosure.

[0225] Table 15:

[0226]

[0227]

[0228] Table 16 below shows aspherical surface data of the optical imaging system 800 according to the eighth embodiment of the present disclosure.

[0229] Table 16:

[0230]

[0231]

[0232] Ninth embodiment:

[0233] Fig. 9A is a configuration diagram of an optical imaging system according to a ninth embodiment of the present disclosure. Fig. 9B is a graph showing aberration characteristics of an optical imaging system according to a ninth embodiment of the present disclosure.

[0234] According to the ninth embodiment, the optical imaging system 900 may 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, a seventh lens 970, and an eighth lens 980 arranged in sequence from the object side, and may further include an infrared cut filter F and an image sensor (imaging surface IP) arranged on the image side of the eighth lens 980. In addition, the optical imaging system 900 may further include a stop ST disposed between the third lens 930 and the fourth lens 940.

[0235] The first lens 910 may have a positive refractive power. The object side surface of the first lens 910 may be convex in the paraxial region, and the image side surface of the first lens 910 may be concave in the paraxial region. The first lens 910 may be formed of a plastic material. In addition, the first lens 910 may be an aspherical lens. For example, the first lens 910 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0236] The second lens 920 may have a negative refractive power. The object side surface of the second lens 920 may be convex in the paraxial region, and the image side surface of the second lens 920 may be concave in the paraxial region. The second lens 920 may be formed of a plastic material. For example, the second lens 920 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the first lens 910, and in an example, the Abbe number of the second lens 920 may be less than 20. In addition, the second lens 920 may be an aspherical lens. For example, the second lens 920 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0237] The third lens 930 may have positive refractive power. The object side surface of the third lens 930 may be convex in the paraxial region, and the image side surface of the third lens 930 may be concave in the paraxial region. The third lens 930 may be formed of a plastic material. For example, the third lens 930 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the second lens 920. In addition, the third lens 930 may be an aspherical lens. For example, the third lens 930 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0238] The fourth lens 940 may have positive refractive power. Both the object side and the image side of the fourth lens 940 may be convex in the paraxial region. The fourth lens 940 may be formed of a plastic material. For example, the fourth lens 940 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the third lens 930. In addition, the fourth lens 940 may be an aspherical lens. For example, the fourth lens 940 may be a double-sided aspherical lens, both the object side and the image side being aspherical.

[0239] The fifth lens 950 may have a negative refractive power. The object side surface of the fifth lens 950 may be convex in the paraxial region, and the image side surface of the fifth lens 950 may be concave in the paraxial region. The fifth lens 950 may be formed of a plastic material. For example, the fifth lens 950 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the fourth lens 940, and in an example, the Abbe number of the fifth lens 950 may be less than 20. In addition, the fifth lens 950 may be an aspherical lens. For example, the fifth lens 950 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0240] The sixth lens 960 may have positive refractive power. The object side surface of the sixth lens 960 may be convex in the paraxial region, and the image side surface of the sixth lens 960 may be concave in the paraxial region. The sixth lens 960 may be formed of a plastic material. For example, the sixth lens 960 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the fifth lens 950. In addition, the sixth lens 960 may be an aspherical lens. For example, the sixth lens 960 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0241] The seventh lens 970 may have positive refractive power. The object side surface of the seventh lens 970 may be convex in the paraxial region, and the image side surface of the seventh lens 970 may be concave in the paraxial region. The seventh lens 970 may be formed of a plastic material. For example, the seventh lens 970 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the sixth lens 960. In addition, the seventh lens 970 may be an aspherical lens. For example, the seventh lens 970 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0242] The eighth lens 980 may have a negative refractive power. The object side surface of the eighth lens 980 may be convex in the paraxial region, and the image side surface of the eighth lens 980 may be concave in the paraxial region. The eighth lens 980 may be formed of a plastic material. For example, the eighth lens 980 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the seventh lens 970. In addition, the eighth lens 980 may be an aspherical lens. For example, the eighth lens 980 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0243] Table 17 below shows optical and physical parameters of the optical imaging system 900 according to the ninth embodiment of the present disclosure.

[0244] Table 17:

[0245]

[0246]

[0247] Table 18 below shows aspherical surface data of the optical imaging system 900 according to the ninth embodiment of the present disclosure.

[0248] Table 18:

[0249]

[0250]

[0251] Tenth embodiment:

[0252] Fig. 10A is a configuration diagram of an optical imaging system according to a tenth embodiment of the present disclosure. Fig. 10B is a graph showing aberration characteristics of the optical imaging system according to the tenth embodiment of the present disclosure.

[0253] According to the tenth embodiment, the optical imaging system 1000 may 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, a seventh lens 1070, and an eighth lens 1080 arranged in sequence from the object side, and may further include an infrared cut filter F and an image sensor (imaging surface IP) arranged on the image side of the eighth lens 1080. In addition, the optical imaging system 1000 may further include a stop ST disposed between the third lens 1030 and the fourth lens 1040.

[0254] The first lens 1010 may have a positive refractive power. The object side surface of the first lens 1010 may be convex in the paraxial region, and the image side surface of the first lens 1010 may be concave in the paraxial region. The first lens 1010 may be formed of a plastic material. In addition, the first lens 1010 may be an aspherical lens. For example, the first lens 1010 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0255] The second lens 1020 may have a negative refractive power. The object side surface of the second lens 1020 may be convex in the paraxial region, and the image side surface of the second lens 1020 may be concave in the paraxial region. The second lens 1020 may be formed of a plastic material. For example, the second lens 1020 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the first lens 1010, and in an example, the Abbe number of the second lens 1020 may be less than 20. In addition, the second lens 1020 may be an aspherical lens. For example, the second lens 1020 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0256] The third lens 1030 may have positive refractive power. The object side surface of the third lens 1030 may be convex in the paraxial region, and the image side surface of the third lens 1030 may be concave in the paraxial region. The third lens 1030 may be formed of a plastic material. For example, the third lens 1030 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the second lens 1020. In addition, the third lens 1030 may be an aspherical lens. For example, the third lens 1030 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0257] The fourth lens 1040 may have positive refractive power. The object side surface of the fourth lens 1040 may be convex in the paraxial region, and the image side surface of the fourth lens 1040 may be concave in the paraxial region. The fourth lens 1040 may be formed of a plastic material. For example, the fourth lens 1040 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the third lens 1030. In addition, the fourth lens 1040 may be an aspherical lens. For example, the fourth lens 1040 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0258] The fifth lens 1050 may have a negative refractive power. The object side surface of the fifth lens 1050 may be convex in the paraxial region, and the image side surface of the fifth lens 1050 may be concave in the paraxial region. The fifth lens 1050 may be formed of a plastic material. For example, the fifth lens 1050 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the fourth lens 1040, and in an example, the Abbe number of the fifth lens 1050 may be less than 20. In addition, the fifth lens 1050 may be an aspherical lens. For example, the fifth lens 1050 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0259] The sixth lens 1060 may have a negative refractive power. The object side surface of the sixth lens 1060 may be convex in the paraxial region, and the image side surface of the sixth lens 1060 may be concave in the paraxial region. The sixth lens 1060 may be formed of a plastic material. For example, the sixth lens 1060 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the fifth lens 1050. In addition, the sixth lens 1060 may be an aspherical lens. For example, the sixth lens 1060 may be a double-sided aspherical lens, both the object side surface and the image side surface being aspherical.

[0260] The seventh lens 1070 may have positive refractive power. The object side surface of the seventh lens 1070 may be convex in the paraxial region, and the image side surface of the seventh lens 1070 may be concave in the paraxial region. The seventh lens 1070 may be formed of a plastic material. For example, the seventh lens 1070 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the sixth lens 1060. In addition, the seventh lens 1070 may be an aspherical lens. For example, the seventh lens 1070 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0261] The eighth lens 1080 may have a negative refractive power. The object side surface of the eighth lens 1080 may be convex in the paraxial region, and the image side surface of the eighth lens 1080 may be concave in the paraxial region. The eighth lens 1080 may be formed of a plastic material. For example, the eighth lens 1080 may be formed of a plastic material having different optical properties (e.g., different refractive index and Abbe number) from the seventh lens 1070. In addition, the eighth lens 1080 may be an aspherical lens. For example, the eighth lens 1080 may be a double-sided aspherical lens, and both the object side surface and the image side surface are aspherical.

[0262] Table 19 below shows optical and physical parameters of the optical imaging system 1000 according to the tenth embodiment of the present disclosure.

[0263] Table 19:

[0264] Face number Radius of curvature Thickness / distance Refractive Index Abbe number Effective diameter object infinity infinity 1 2.045 0.769 1.546 55.990 1.488 2 9.752 0.050 1.449 3 8.189 0.220 1.677 19.238 1.393 4 3.462 0.135 1.273 5 5.188 0.303 1.570 37.403 1.258 6 8.175 0.194 1.175 Aperture infinity 0.111 1.161 7 26.181 0.265 1.546 55.990 1.276 8 116.645 0.438 1.434 9 4.367 0.220 1.677 19.238 1.646 10 4.093 0.683 1.909 11 6.898 0.431 1.570 37.403 2.228 12 5.063 0.115 2.414 13 4.364 0.480 1.546 55.990 2.672 14 25.743 0.282 2.960 15 18.379 0.520 1.537 55.735 4.166 16 2.367 0.500 4.367 17 infinity 0.210 1.518 64.197 18 infinity 0.324 Imaging surface infinity

[0265] Table 20 below shows aspherical surface data of the optical imaging system 1000 according to the tenth embodiment of the present disclosure.

[0266] Table 20:

[0267]

[0268] Table 21 below shows optical and physical parameters related to the focal length and conditional expressions of the optical imaging system according to an embodiment of the present disclosure.

[0269] Table 21:

[0270]

[0271] According to the embodiments of the present disclosure described above, the optical imaging system can be manufactured to be thin and light relative to the size of the image sensor.

[0272] According to an embodiment of the present disclosure, a thin and light optical imaging system having a short total track length relative to the size of an image sensor may be provided.

[0273] One aspect of the present disclosure is to provide an optical imaging system having a short overall track length relative to the size of the image sensor.

[0274] Although specific examples have been shown and described above, it will be apparent after understanding the present disclosure 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 changes within the scope of the claims and their equivalents will be interpreted as included in the present disclosure.

Claims

1. An optical imaging system, comprising: A first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens are arranged in sequence from the object side to the imaging surface side, wherein the fourth lens has a positive refractive power, and the eighth lens has a convex object side surface, There are eight lenses with refractive power in the optical imaging system, and Wherein, the optical imaging system satisfies: TTL / (2×IMG HT)×Fno<1.000, Wherein, TTL is the distance from the object side of the first lens to the imaging plane, IMG HT is half of the diagonal length of the imaging plane, and Fno is the F value of the optical imaging system. 2 . The optical imaging system according to claim 1 , further comprising an aperture stop disposed between the third lens and the fourth lens.

3. The optical imaging system according to claim 1, wherein: The second lens and the fifth lens have an Abbe number less than 20.

4. The optical imaging system according to claim 1, wherein: The fourth lens has a convex object-side surface.

5. The optical imaging system according to claim 1, wherein: The fourth lens has a convex image-side surface.

6. The optical imaging system according to claim 1, wherein: The sixth lens has negative refractive power.

7. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies: 1.100≤TTL / f≤1.200, Wherein, f is the focal length of the optical imaging system.

8. The optical imaging system according to claim 1, wherein: The third lens has positive refractive power, and the fifth lens has negative refractive power.

9. An optical imaging system, comprising: A first lens having positive refractive power; The second lens has negative refractive power; A third lens element having positive refractive power; The fourth lens has refractive power; A fifth lens element having negative refractive power; a sixth lens having refractive power; A seventh lens element having positive refractive power; as well as The eighth lens has negative refractive power. Wherein, the first lens to the eighth lens are arranged in sequence from the object side to the imaging surface side, There are eight lenses with refractive power in the optical imaging system, and Wherein, the optical imaging system satisfies: TTL / (2×IMG HT)×Fno<1.000, Wherein, TTL is the distance from the object side of the first lens to the imaging plane, IMG HT is half of the diagonal length of the imaging plane, and Fno is the F value of the optical imaging system.

10. The optical imaging system according to claim 9, further comprising a stop disposed between the third lens and the fourth lens, in, The optical imaging system satisfies: v2+v5<40, Wherein, v2 is the Abbe number of the second lens, and v5 is the Abbe number of the fifth lens.

11. The optical imaging system according to claim 9, wherein: The fourth lens has positive refractive power and a convex image-side surface.

12. The optical imaging system according to claim 9, wherein: The eighth lens has a convex object-side surface.

13. The optical imaging system according to claim 9, wherein: The fourth lens has a convex object-side surface.

14. The optical imaging system according to claim 9, wherein: The sixth lens has positive refractive power.

15. The optical imaging system according to claim 9, wherein: The sixth lens has a convex object-side surface and a concave image-side surface.

16. The optical imaging system according to claim 9, wherein: The optical imaging system satisfies: 0.500≤TTL / (2×IMG HT)<0.620.

Images