Optical image capturing system

Abstract

The optical imaging system comprises a first lens, a second lens, a third lens, a fourth lens with a convex image side surface, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged from an object side to an imaging surface, and {TTL / (2 * IMG HT)} * Fnot is satisfied; tTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, IMG HT is half of the diagonal length of the imaging surface, and Fno is the F value of the optical imaging system.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0003422, filed on January 9, 2024, with the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. Technical Field

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

[0004] High-performance cameras are used in mobile devices. For example, large image sensors with a large number of pixels can be used in mobile cameras to achieve high-resolution images.

[0005] In such cameras, the lens size is typically increased proportionally to the image sensor size. However, due to the thickness constraints of mobile devices, it is difficult to match the lens size with the image sensor size. Furthermore, due to the slimming trend of mobile devices, even if the increase in lens size is minimized, it is difficult to avoid design flaws such as camera protrusion.

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

[0007] This summary portion is provided to briefly introduce the selection of concepts, which will be further described in the detailed description portion below. This summary portion is not intended to identify key or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

[0008] In one general aspect, the 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 sequentially from the object side to the imaging plane, wherein {TTL / (2×IMG HT)}×Fno<1.000, where TTL is the distance from the object side of the first lens to the imaging plane on the optical axis, IMG HT is half the diagonal length of the imaging plane, and Fno is the F-value of the optical imaging system.

[0009] The third lens can have positive refractive power.

[0010] The sixth lens can have positive refractive power.

[0011] The optical imaging system can satisfy 0 < v1 - (v6 + v7) / 2 < 30.00, where v1 is the Abbe number of the first lens, v6 is the Abbe number of the sixth lens, and v7 is the Abbe number of the seventh lens.

[0012] The optical imaging system can satisfy 0 < f7 / f < 2.000, where f is the focal length of the optical imaging system, and f7 is the focal length of the seventh lens.

[0013] The optical imaging system can satisfy -1.000 < f8 / f < 0, where f is the focal length of the optical imaging system, and f8 is the focal length of the eighth lens.

[0014] The third lens can have a negative refractive power.

[0015] The Abbe number of the first lens and the Abbe number of the fourth lens can be identical to each other.

[0016] The object side surface and the image side surface of the seventh lens can each have a convex shape.

[0017] In another general aspect, an optical imaging system includes, in order from an object side to an image plane, 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, wherein 0.500 ≤ TTL / (2×IMG HT) < 0.750 and 1.000 < Fno < 1.600 are satisfied, where TTL is a distance on an optical axis from an object side surface of the first lens to the image plane, IMG HT is half of a diagonal length of the image plane, and Fno is an F number of the optical imaging system.

[0018] The Abbe number of the second lens and the Abbe number of the third lens can be identical to each other.

[0019] The seventh lens can have a positive refractive power and a convex image side surface.

[0020] The third lens can have a negative refractive power, and the sixth lens can have a positive refractive power.

[0021] The optical imaging system can satisfy 1.100 ≤ TTL / f ≤ 1.400, where f is the focal length of the optical imaging system.

[0022] The Abbe number of the first lens and the Abbe number of the fourth lens can be identical to each other.

[0023] The optical imaging system can satisfy {TTL / (2×IMG HT)}×Fno < 1.000.

[0024] According to example embodiments of the present disclosure, an optical imaging system that is slim and bright compared to the size of an image sensor can be implemented.

[0025] Other features and aspects will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the application. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1A is a configuration diagram of an optical imaging system according to a first embodiment of the present disclosure;

[0027] Figure 1B is a graph showing aberration characteristics of the optical imaging system according to the first embodiment of the present disclosure;

[0028] Figure 2A is a configuration diagram of an optical imaging system according to a second embodiment of the present disclosure;

[0029] Figure 2B is a graph showing aberration characteristics of the optical imaging system according to the second embodiment of the present disclosure;

[0030] Figure 3A is a configuration diagram of an optical imaging system according to a third embodiment of the present disclosure;

[0031] Figure 3B is a graph showing aberration characteristics of the optical imaging system according to the third embodiment of the present disclosure;

[0032] Figure 4A is a configuration diagram of an optical imaging system according to a fourth embodiment of the present disclosure;

[0033] Figure 4B is a graph showing aberration characteristics of the optical imaging system according to the fourth embodiment of the present disclosure;

[0034] Figure 5A is a configuration diagram of an optical imaging system according to a fifth embodiment of the present disclosure;

[0035] Figure 5B is a graph showing aberration characteristics of the optical imaging system according to the fifth embodiment of the present disclosure;

[0036] Figure 6A is a configuration diagram of an optical imaging system according to a sixth embodiment of the present disclosure;

[0037] Figure 6B is a graph showing aberration characteristics of the optical imaging system according to the sixth embodiment of the present disclosure;

[0038] Figure 7A is a configuration diagram of an optical imaging system according to a seventh embodiment of the present disclosure;

[0039] Figure 7B is a graph showing aberration characteristics of the optical imaging system according to the seventh embodiment of the present disclosure;

[0040] Figure 8A This is a configuration diagram of an optical imaging system according to the eighth embodiment of this disclosure;

[0041] Figure 8B It is a graph showing the aberration characteristics of an optical imaging system according to the eighth embodiment of the present disclosure;

[0042] Figure 9A This is a configuration diagram of an optical imaging system according to the ninth embodiment of this disclosure;

[0043] Figure 9B It is a graph showing the aberration characteristics of an optical imaging system according to the ninth embodiment of the present disclosure;

[0044] Figure 10A This is a configuration diagram of an optical imaging system according to the tenth embodiment of this disclosure;

[0045] Figure 10B This is a graph showing the aberration characteristics of an optical imaging system according to the tenth embodiment of the present disclosure;

[0046] Figure 11A This is a configuration diagram of an optical imaging system according to the eleventh embodiment of the present disclosure;

[0047] Figure 11B This is a graph showing the aberration characteristics of the optical imaging system according to the eleventh embodiment of the present disclosure;

[0048] Figure 12A This is a configuration diagram of an optical imaging system according to the twelfth embodiment of this disclosure;

[0049] Figure 12B This is a graph showing the aberration characteristics of the optical imaging system according to the twelfth embodiment of the present disclosure;

[0050] Figure 13A This is a configuration diagram of an optical imaging system according to the thirteenth embodiment of this disclosure; and

[0051] Figure 13B This is a graph showing the aberration characteristics of an optical imaging system according to the thirteenth embodiment of this disclosure.

[0052] Throughout the accompanying drawings and detailed embodiments, unless otherwise described, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative dimensions, scale, and depiction of elements in the drawings may be exaggerated. Detailed Implementation

[0053] Hereinafter, although examples of the disclosure will be described in detail with reference to the accompanying drawings, it should be noted that the examples are not limited thereto.

[0054] The following detailed description is presented in order to provide a thorough understanding of the methods, apparatuses, and / or systems described herein. However, various changes, modifications, and equivalents in the methods, apparatuses, and / or systems described herein will be apparent to those skilled in the art after understanding the present disclosure. For example, the order of the operations described herein is merely an example and not limiting, except where otherwise indicated in the examples described herein, and can be changed, except where otherwise indicated in the examples described herein, which will be apparent to those of ordinary skill in the art after understanding the present disclosure. Furthermore, descriptions of features in terms of a single implementation or aspect are not to be interpreted as being limited to the features described, but are applicable to other features, unless otherwise indicated. Additionally, features described herein as being optional can be considered optional in some implementations, and required in other implementations, and vice versa, which will be apparent to those of ordinary skill in the art after understanding the present disclosure.

[0055] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, these examples are provided so that this disclosure will be thorough and complete, and will fully convey the concept of implementing the methods, apparatuses, and / or systems described herein to those skilled in the art after understanding the present disclosure. Accordingly, known methods, apparatuses, and / or systems can be described without particular detail.

[0056] Throughout the specification, when an element such as a layer, region, or substrate is referred to as being "on", "connected to", or "coupled to" another element, it can be directly on, directly connected to, or directly coupled to the other element, or one or more other elements can be interposed therebetween. Conversely, when an element is referred to as being "directly on", "directly connected to", or "directly coupled to" another element, there are no other elements interposed therebetween.

[0057] As used herein, the term "and / or" includes any one of the associated listed items, as well as any combination of any two or more of the associated listed items; likewise, "at least one of" includes any one of the associated listed items, as well as any combination of any two or more of the associated listed items.

[0058] Although terms such as "first", "second", and "third" can be used in this document to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited by these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or section from another component, part, region, layer, or section. Therefore, a first component, a first part, a first region, a first layer, or a first section mentioned in the examples can also be called a second component, a second part, a second region, a second layer, or a second section without departing from the teachings of the examples described herein.

[0059] Spatially relative terms, such as "on", "above", "below", "lower", "upper", and the like, can be used herein for ease of description to describe one element's relationship to another element as illustrated in the figures. Such spatially relative terms are in

[0060] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The singular terms "a", "an", and "the" include plural referents unless context clearly indicates otherwise. The terms "comprises", "comprising", and "having" are intended to be inclusive and

[0061] The shapes shown in the drawings can vary due to manufacturing techniques and / or tolerances. Thus, the examples described herein are not limited to the precise shapes shown in the drawings, but include variations in shapes that occur during manufacturing.

[0062] It should be noted that, in this document, the term "may" is used in a permissive sense (i.e., meaning having the potential to), rather than the mandatory sense (i.e., meaning must). Unless otherwise noted, the use of "or" in a list of items (for example, a list of items prefaced by a term such as "one or more") indicates an inclusive term (i.e., the term "or" in the list should be interpreted as including one item, or more than one item, or an equivalent term such as "at least one", "one or more", or "and / or").

[0063] Features of the examples described herein can be combined with each other in a variety of ways. Furthermore, although the examples described herein have a variety of configurations, other configurations are possible in light of this disclosure.

[0064] In one or more examples, numerical values of a radius of curvature, a thickness, a gap or distance, a focal length, and an IMG HT (1 / 2 of a diagonal length of an imaging surface) of a lens are in millimeters, and a unit of a field of view (FOV) can be degrees. Also, the thickness of the lens and the gap between the lenses can refer to the thickness and the gap on an optical axis, respectively.

[0065] In one or more examples, the object side can indicate a direction in which an object is disposed, and the image side can indicate a direction in which an imaging surface on which an image is formed is disposed or a direction in which an image sensor is disposed, for example.

[0066] In descriptions related to the shape of a lens in one or more examples, a surface being convex discloses that a paraxial region (e.g., a relatively narrow region near an optical axis) of the corresponding surface is convex, and a surface being concave discloses that a paraxial region of the corresponding surface is concave. Thus, even if one surface of a lens is described as having a convex shape, an edge of the lens can be concave. Similarly, even if one surface of a lens is described as having a concave shape, an edge of the lens can have a convex shape.

[0067] An optical imaging system according to an exemplary embodiment can form a part of a camera module mounted on a mobile device. For example, the mobile device can be any type of portable electronic device such as, but not limited to, a mobile communication terminal, a smart phone, or a tablet personal computer (PC).

[0068] In an exemplary embodiment of the disclosure, the optical imaging system can include eight lenses. For example, the optical imaging system can 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 this order from an object side.

[0069] In addition, the optical imaging system can not only include a plurality of lenses, but also include an image sensor that converts incident light into an electrical signal, an infrared blocking filter that blocks light in an infrared region from being incident on the image sensor, and an aperture that adjusts the amount of incident light.

[0070] In an embodiment of the disclosure, the optical imaging system can include lenses formed of a plastic material. For example, at least some of the first lens to the eighth lens can be formed of a plastic material, and preferably, all of the first lens to the eighth lens can be formed of a plastic material.

[0071] In an exemplary embodiment of the disclosure, the optical imaging system can include an aspheric lens. For example, at least one of the first lens to the eighth lens can be an aspheric lens, and in at least one of the first lens to the eighth lens, at least one of an object side surface and an image side surface is an aspheric surface. The aspheric surface of the lens is represented by Equation 1.

[0072] Equation 1:

[0073]

[0074] In Equation 1, c denotes the reciprocal of the radius of curvature of the lens, K denotes the conic constant, and Y denotes the distance from an arbitrary point on the aspherical surface of the lens to the optical axis. Also, the constants A to H, J, and L to P are aspherical constants from the fourth order to the thirtieth order, and Z is the distance in the optical axis direction between an arbitrary point on the aspherical surface and the vertex of the corresponding aspherical surface.

[0075] In the exemplary embodiments of the disclosure, the optical imaging system can satisfy one or more of the following conditional equations.

[0076] Conditional Equation 1: 1.100 ≤ TTL / f ≤ 1.400

[0077] Conditional Equation 2: 0.500 ≤ TTL / (2×IMG HT) < 0.750

[0078] Conditional Equation 3: {TTL / (2×IMG HT)}×Fno < 1.000

[0079] Conditional Equation 4: 1.000 < Fno < 1.600

[0080] Conditional Equation 5: 0 < v1-(v6+v7) / 2 < 30.00

[0081] Conditional Equation 6: 0 < f7 / f < 2.000

[0082] Conditional Equation 7: -1.000 < f8 / f < 0

[0083] Conditional Equation 8: -0.600 < f1 / f2 < 0

[0084] Conditional Equation 9: -1.000 < f1 / f3 < 0.100

[0085] In Conditional Equation 1, TTL denotes the distance on the optical axis from the object side surface of the first lens to the image plane, and f denotes the focal length of the optical imaging system. Conditional Equation 1 relates to the small size feature of the optical imaging system according to the exemplary embodiments of the disclosure.

[0086] In Conditional Equation 2, TTL denotes the distance on the optical axis from the object side surface of the first lens to the image plane, and IMG HT denotes half the diagonal length of the image plane (i.e., 2×IMG HT is the diagonal length of the image plane). Conditional Equation 2 relates to the feature that the size of the optical imaging system according to the exemplary embodiments of the disclosure is smaller than the size of the image sensor.

[0087] Conditional Equation 3 relates to the size and brightness characteristics of the optical imaging system according to the exemplary embodiments of the disclosure.

[0088] Condition Equation 4 relates to a brightness characteristic of the optical imaging system according to an exemplary embodiment of the present disclosure.

[0089] In Condition Equation 5, v1 denotes the Abbe number of the first lens, v6 denotes the Abbe number of the sixth lens, and v7 denotes the Abbe number of the seventh lens. Condition Equation 5 relates to a design condition for improving a color aberration correction performance of the optical imaging system according to an exemplary embodiment of the present disclosure.

[0090] In Condition Equation 6, f denotes a focal length of the optical imaging system, and f7 denotes a focal length of the seventh lens. Condition Equation 6 relates to a condition for the seventh lens for the optical imaging system to have an appropriate refractive power according to an exemplary embodiment of the present disclosure.

[0091] In Condition Equation 7, f denotes a focal length of the optical imaging system, and f8 denotes a focal length of the eighth lens. Condition Equation 7 relates to a condition for the eighth lens for the optical imaging system to have an appropriate refractive power according to an exemplary embodiment of the present disclosure.

[0092] In Condition Equation 8, f1 denotes a focal length of the first lens, and f2 denotes a focal length of the second lens. Condition Equation 8 relates to a condition of the first lens and the second lens for ensuring an aberration correction performance of the optical imaging system according to an exemplary embodiment of the present disclosure.

[0093] In Condition Equation 9, f1 denotes a focal length of the first lens, and f3 denotes a focal length of the third lens. Condition Equation 9 relates to a condition of the first lens and the third lens for ensuring an aberration correction performance of the optical imaging system according to an exemplary embodiment of the present disclosure.

[0094] Hereinafter, an optical imaging system according to an exemplary embodiment of the present disclosure will be described with reference to the accompanying drawings.

[0095] First embodiment

[0096] 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 an aberration characteristic of an optical imaging system according to the first embodiment of the present disclosure.

[0097] According to the first embodiment, the optical imaging system 100 can include, arranged in order from the object side, 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, and can further include an infrared blocking filter F and an image sensor (i.e., an imaging plane IP) disposed on the image side of the eighth lens 180. In addition, the optical imaging system 100 can further include a stop ST disposed between the object side surface and the image side surface of the first lens 110. Furthermore, the optical imaging system 100 can further include a spacer between the second lens 120 and the third lens 130.

[0098] The first lens 110 can have a positive refractive power. The object side surface of the first lens 110 can have a convex shape in the paraxial region, and the image side surface of the first lens 110 can have a concave shape in the paraxial region. The first lens 110 can be formed of a plastic material. Furthermore, the first lens 110 can be an aspherical lens. For example, the first lens 110 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0099] The second lens 120 can have a negative refractive power. The object side surface of the second lens 120 can have a convex shape in the paraxial region, and the image side surface of the second lens 120 can have a concave shape in the paraxial region. The second lens 120 can be formed of a plastic material. For example, the second lens 120 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) different from those of the first lens 110. Furthermore, the second lens 120 can be an aspherical lens. For example, the second lens 120 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0100] The third lens 130 can have a negative refractive power. The object side surface of the third lens 130 can have a convex shape in the paraxial region, and the image side surface of the third lens 130 can have a concave shape in the paraxial region. The third lens 130 can be formed of a plastic material. For example, the third lens 130 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) identical to those of the second lens 120. In addition, the third lens 130 can be an aspherical lens. For example, the third lens 130 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0101] The fourth lens 140 can have a positive refractive power. Both the object side surface and the image side surface of the fourth lens 140 can have a convex shape in the paraxial region. The fourth lens 140 can be formed of a plastic material. For example, the fourth lens 140 can be formed of a plastic material having optical properties (e.g., different refractive index and Abbe number) different from those of the third lens 130. Meanwhile, the fourth lens 140 can be formed of a plastic material having optical properties (e.g., the same refractive index and Abbe number) identical to those of the first lens 110. In addition, the fourth lens 140 can be an aspheric lens. For example, the fourth lens 140 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0102] The fifth lens 150 can have a negative refractive power. The object side surface of the fifth lens 150 can have a convex shape in the paraxial region, and the image side surface of the fifth lens 150 can have a concave shape in the paraxial region. The fifth lens 150 can be formed of a plastic material. For example, the fifth lens 150 can be formed of a plastic material having optical properties (e.g., different refractive index and Abbe number) different from those of the fourth lens 140. In addition, the fifth lens 150 can be an aspheric lens. For example, the fifth lens 150 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0103] The sixth lens 160 can have a positive refractive power. The object side surface of the sixth lens 160 can have a convex shape in the paraxial region, and the image side surface of the sixth lens 160 can have a concave shape in the paraxial region. The sixth lens 160 can be formed of a plastic material. For example, the sixth lens 160 can be formed of a plastic material having optical properties (e.g., different refractive index and Abbe number) different from those of the fifth lens 150. In addition, the sixth lens 160 can be an aspheric lens. For example, the sixth lens 160 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0104] The seventh lens 170 can have a positive refractive power. The object side surface of the seventh lens 170 can have a convex shape in the paraxial region, and the image side surface of the seventh lens 170 can have a concave shape in the paraxial region. The seventh lens 170 can be formed of a plastic material. For example, the seventh lens 170 can be formed of a plastic material having optical properties (e.g., different refractive index and Abbe number) different from those of the sixth lens 160. In addition, the seventh lens 170 can be an aspheric lens. For example, the seventh lens 170 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0105] The eighth lens 180 can have a negative refractive power. The object side surface of the eighth lens 180 can have a convex shape in the paraxial region, and the image side surface of the eighth lens 180 can have a concave shape in the paraxial region. The eighth lens 180 can be formed of a plastic material. For example, the eighth lens 180 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the seventh lens 170. In addition, the eighth lens 180 can be an aspheric lens. For example, the eighth lens 180 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0106] Table 1 below shows optical and physical parameters of the optical imaging system 100 according to the first embodiment of the disclosure.

[0107] Table 1

[0108]

[0109]

[0110] Table 2 below shows aspheric data of the optical imaging system 100 according to the first embodiment of the disclosure.

[0111] Table 2

[0112]

[0113]

[0114] Second embodiment

[0115] Figure 2A is a configuration diagram of an optical imaging system according to a second embodiment of the disclosure. Figure 2B is a graph showing aberration characteristics of an optical imaging system according to the second embodiment of the disclosure.

[0116] According to the second embodiment, the optical imaging system 200 can include a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, a sixth lens 260, a seventh lens 270, and an eighth lens 280 arranged in order from an object side, and can further include an infrared blocking filter F and an image sensor (i.e., an imaging plane IP) disposed on an image side of the eighth lens 280. In addition, the optical imaging system 200 can further include a stop ST disposed between an object side surface and an image side surface of the first lens 210. Furthermore, the optical imaging system 200 can further include a spacer between the second lens 220 and the third lens 230.

[0117] The first lens 210 can have a positive refractive power. The object side surface of the first lens 210 can have a convex shape in a paraxial region, and the image side surface of the first lens 210 can have a concave shape in the paraxial region. The first lens 210 can be formed of a plastic material. Also, the first lens 210 can be an aspherical lens. For example, the first lens 210 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0118] The second lens 220 can have a negative refractive power. The object side surface of the second lens 220 can have a convex shape in a paraxial region, and the image side surface of the second lens 220 can have a concave shape in the paraxial region. The second lens 220 can be formed of a plastic material. For example, the second lens 220 can be formed of a plastic material having optical characteristics (e.g., different refractive indices and Abbe numbers) different from those of the first lens 210. Also, the second lens 220 can be an aspherical lens. For example, the second lens 220 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0119] The third lens 230 can have a negative refractive power. The object side surface of the third lens 230 can have a convex shape in a paraxial region, and the image side surface of the third lens 230 can have a concave shape in the paraxial region. The third lens 230 can be formed of a plastic material. For example, the third lens 230 can be formed of a plastic material having optical characteristics (e.g., the same refractive indices and Abbe numbers) identical to those of the second lens 220. Also, the third lens 230 can be an aspherical lens. For example, the third lens 230 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0120] The fourth lens 240 can have a positive refractive power. The object side surface of the fourth lens 240 can have a concave shape in a paraxial region, and the image side surface of the fourth lens 240 can have a convex shape in the paraxial region. The fourth lens 240 can be formed of a plastic material. For example, the fourth lens 240 can be formed of a plastic material having optical characteristics (e.g., different refractive indices and Abbe numbers) different from those of the third lens 230. Meanwhile, the fourth lens 240 can be formed of a plastic material having optical characteristics (e.g., the same refractive indices and Abbe numbers) identical to those of the first lens 210. Also, the fourth lens 240 can be an aspherical lens. For example, the fourth lens 240 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0121] The fifth lens 250 can have a negative refractive power. The object side surface of the fifth lens 250 can have a convex shape in the paraxial region, and the image side surface of the fifth lens 250 can have a concave shape in the paraxial region. The fifth lens 250 can be formed of a plastic material. For example, the fifth lens 250 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the fourth lens 240. In addition, the fifth lens 250 can be an aspherical lens. For example, the fifth lens 250 can be a biaxial aspherical lens whose object side surface and image side surface are both aspherical.

[0122] The sixth lens 260 can have a negative refractive power. The object side surface of the sixth lens 260 can have a convex shape in the paraxial region, and the image side surface of the sixth lens 260 can have a concave shape in the paraxial region. The sixth lens 260 can be formed of a plastic material. For example, the sixth lens 260 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the fifth lens 250. In addition, the sixth lens 260 can be an aspherical lens. For example, the sixth lens 260 can be a biaxial aspherical lens whose object side surface and image side surface are both aspherical.

[0123] The seventh lens 270 can have a positive refractive power. The object side surface and the image side surface of the seventh lens 270 can both have a convex shape in the paraxial region. The seventh lens 270 can be formed of a plastic material. For example, the seventh lens 270 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the sixth lens 260. In addition, the seventh lens 270 can be an aspherical lens. For example, the seventh lens 270 can be a biaxial aspherical lens whose object side surface and image side surface are both aspherical.

[0124] The eighth lens 280 can have a negative refractive power. The object side surface of the eighth lens 280 can have a convex shape in the paraxial region, and the image side surface of the eighth lens 280 can have a concave shape in the paraxial region. The eighth lens 280 can be formed of a plastic material. For example, the eighth lens 280 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the seventh lens 270. In addition, the eighth lens 280 can be an aspherical lens. For example, the eighth lens 280 can be a biaxial aspherical lens whose object side surface and image side surface are both aspherical.

[0125] Table 3 below shows optical and physical parameters of the optical imaging system 200 according to the second embodiment of the disclosure.

[0126] Table 3

[0127]

[0128]

[0129] Table 4 below shows aspherical surface data of the optical imaging system 200 according to the second embodiment of the disclosure.

[0130] Table 4

[0131]

[0132]

[0133] Third embodiment

[0134] Figure 3A is a configuration diagram of an optical imaging system according to a third embodiment of the disclosure. Figure 3B is a graph showing aberration characteristics of an optical imaging system according to the third embodiment of the disclosure.

[0135] According to the third embodiment, the optical imaging system 300 can include a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, a sixth lens 360, a seventh lens 370, and an eighth lens 380 arranged in this order from an object side, and can further include an infrared blocking filter F and an image sensor (i.e., an imaging plane IP) provided on an image side of the eighth lens 380. In addition, the optical imaging system 300 can further include a stop ST provided between an object side surface and an image side surface of the first lens 310. Furthermore, the optical imaging system 300 can further include a spacer between the second lens 320 and the third lens 330.

[0136] The first lens 310 can have a positive refractive power. The object side surface of the first lens 310 can have a convex shape in a paraxial region, and the image side surface of the first lens 310 can have a concave shape in the paraxial region. The first lens 310 can be formed of a plastic material. Furthermore, the first lens 310 can be an aspherical lens. For example, the first lens 310 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0137] The second lens 320 can have a negative refractive power. The object side surface of the second lens 320 can have a convex shape in a paraxial region, and the image side surface of the second lens 320 can have a concave shape in the paraxial region. The second lens 320 can be formed of a plastic material. For example, the second lens 320 can be formed of a plastic material having optical characteristics (e.g., different refractive indices and Abbe numbers) different from those of the first lens 310. Furthermore, the second lens 320 can be an aspherical lens. For example, the second lens 320 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0138] The third lens 330 can have a positive refractive power. The object side surface of the third lens 330 can have a convex shape in the paraxial region, and the image side surface of the third lens 330 can have a concave shape in the paraxial region. The third lens 330 can be formed of a plastic material. For example, the third lens 330 can be formed of a plastic material having the same optical characteristics (e.g., the same refractive index and Abbe number) as the optical characteristics of the second lens 320. In addition, the third lens 330 can be an aspheric lens. For example, the third lens 330 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0139] The fourth lens 340 can have a positive refractive power. The object side surface of the fourth lens 340 can have a concave shape in the paraxial region, and the image side surface of the fourth lens 340 can have a convex shape in the paraxial region. The fourth lens 340 can be formed of a plastic material. For example, the fourth lens 340 can be formed of a plastic material having different optical characteristics (e.g., different refractive index and Abbe number) from the optical characteristics of the third lens 330. Meanwhile, the fourth lens 340 can be formed of a plastic material having the same optical characteristics (e.g., the same refractive index and Abbe number) as the optical characteristics of the first lens 310. In addition, the fourth lens 340 can be an aspheric lens. For example, the fourth lens 340 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0140] The fifth lens 350 can have a negative refractive power. The object side surface of the fifth lens 350 can have a convex shape in the paraxial region, and the image side surface of the fifth lens 350 can have a concave shape in the paraxial region. The fifth lens 350 can be formed of a plastic material. For example, the fifth lens 350 can be formed of a plastic material having different optical characteristics (e.g., different refractive index and Abbe number) from the optical characteristics of the fourth lens 340. In addition, the fifth lens 350 can be an aspheric lens. For example, the fifth lens 350 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0141] The sixth lens 360 can have a negative refractive power. The object side surface of the sixth lens 360 can have a convex shape in the paraxial region, and the image side surface of the sixth lens 360 can have a concave shape in the paraxial region. The sixth lens 360 can be formed of a plastic material. For example, the sixth lens 360 can be formed of a plastic material having different optical characteristics (e.g., different refractive index and Abbe number) from the optical characteristics of the fifth lens 350. In addition, the sixth lens 360 can be an aspheric lens. For example, the sixth lens 360 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0142] The seventh lens 370 can have a positive refractive power. Both the object side surface and the image side surface of the seventh lens 370 can have a convex shape in the paraxial region. The seventh lens 370 can be formed of a plastic material. For example, the seventh lens 370 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the sixth lens 360. In addition, the seventh lens 370 can be an aspherical lens. For example, the seventh lens 370 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0143] The eighth lens 380 can have a negative refractive power. The object side surface of the eighth lens 380 can have a convex shape in the paraxial region, and the image side surface of the eighth lens 380 can have a concave shape in the paraxial region. The eighth lens 380 can be formed of a plastic material. For example, the eighth lens 380 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the seventh lens 370. In addition, the eighth lens 380 can be an aspherical lens. For example, the eighth lens 380 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0144] Table 5 below shows optical and physical parameters of the optical imaging system 300 according to the third embodiment of the present disclosure.

[0145] Table 5

[0146]

[0147]

[0148] Table 6 below shows aspherical data of the optical imaging system 300 according to the third embodiment of the present disclosure.

[0149] Table 6

[0150]

[0151]

[0152] Fourth embodiment

[0153] Figure 4A is a configuration diagram of an optical imaging system according to a fourth embodiment of the present disclosure, and Figure 4B is a graph showing aberration characteristics of an optical imaging system according to the fourth embodiment of the present disclosure.

[0154] According to the fourth embodiment, the optical imaging system 400 can include, arranged in order from the object side, 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, and can further include an infrared blocking filter F and an image sensor (i.e., an imaging plane IP) disposed on the image side of the eighth lens 480. In addition, the optical imaging system 400 can further include a stop ST disposed between the object side surface and the image side surface of the first lens 410. Furthermore, the optical imaging system 400 can further include a spacer between the second lens 420 and the third lens 430.

[0155] The first lens 410 can have a positive refractive power. The object side surface of the first lens 410 can have a convex shape in the paraxial region, and the image side surface of the first lens 410 can have a concave shape in the paraxial region. The first lens 410 can be formed of a plastic material. In addition, the first lens 410 can be an aspheric lens. For example, the first lens 410 can be a double aspheric lens whose object side surface and image side surface are both aspheric.

[0156] The second lens 420 can have a negative refractive power. The object side surface of the second lens 420 can have a convex shape in the paraxial region, and the image side surface of the second lens 420 can have a concave shape in the paraxial region. The second lens 420 can be formed of a plastic material. For example, the second lens 420 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) different from those of the first lens 410. In addition, the second lens 420 can be an aspheric lens. For example, the second lens 420 can be a double aspheric lens whose object side surface and image side surface are both aspheric.

[0157] The third lens 430 can have a positive refractive power. The object side surface of the third lens 430 can have a convex shape in the paraxial region, and the image side surface of the third lens 430 can have a concave shape in the paraxial region. The third lens 430 can be formed of a plastic material. For example, the third lens 430 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) identical to those of the second lens 420. In addition, the third lens 430 can be an aspheric lens. For example, the third lens 430 can be a double aspheric lens whose object side surface and image side surface are both aspheric.

[0158] The fourth lens 440 can have a positive refractive power. The object side surface of the fourth lens 440 can have a concave shape in the paraxial region, and the image side surface of the fourth lens 440 can have a convex shape in the paraxial region. The fourth lens 440 can be formed of a plastic material. For example, the fourth lens 440 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the third lens 430. Meanwhile, the fourth lens 440 can be formed of a plastic material having optical properties (e.g., the same refractive indices and Abbe numbers) identical to those of the first lens 410. In addition, the fourth lens 440 can be an aspheric lens. For example, the fourth lens 440 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0159] The fifth lens 450 can have a negative refractive power. The object side surface of the fifth lens 450 can have a convex shape in the paraxial region, and the image side surface of the fifth lens 450 can have a concave shape in the paraxial region. The fifth lens 450 can be formed of a plastic material. For example, the fifth lens 450 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the fourth lens 440. In addition, the fifth lens 450 can be an aspheric lens. For example, the fifth lens 450 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0160] The sixth lens 460 can have a negative refractive power. The object side surface of the sixth lens 460 can have a convex shape in the paraxial region, and the image side surface of the sixth lens 460 can have a concave shape in the paraxial region. The sixth lens 460 can be formed of a plastic material. For example, the sixth lens 460 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the fifth lens 450. In addition, the sixth lens 460 can be an aspheric lens. For example, the sixth lens 460 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0161] The seventh lens 470 can have a positive refractive power. The object side surface and the image side surface of the seventh lens 470 can both have a convex shape in the paraxial region. The seventh lens 470 can be formed of a plastic material. For example, the seventh lens 470 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the sixth lens 460. In addition, the seventh lens 470 can be an aspheric lens. For example, the seventh lens 470 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0162] The eighth lens 480 can have a negative refractive power. The object side surface of the eighth lens 480 can have a convex shape in the paraxial region, and the image side surface of the eighth lens 480 can have a concave shape in the paraxial region. The eighth lens 480 can be formed of a plastic material. For example, the eighth lens 480 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the seventh lens 470. In addition, the eighth lens 480 can be an aspheric lens. For example, the eighth lens 480 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0163] Table 7 below shows optical and physical parameters of the optical imaging system 400 according to the fourth embodiment of the disclosure.

[0164] Table 7

[0165]

[0166]

[0167] Table 8 below shows aspheric data of the optical imaging system 400 according to the fourth embodiment of the disclosure.

[0168] Table 8

[0169]

[0170]

[0171] Fifth embodiment

[0172] Figure 5A is a configuration diagram of an optical imaging system according to a fifth embodiment of the disclosure. Figure 5B is a graph showing aberration characteristics of an optical imaging system according to the fifth embodiment of the disclosure.

[0173] According to the fifth embodiment, the optical imaging system 500 can include a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, a sixth lens 560, a seventh lens 570, and an eighth lens 580 arranged in this order from the object side, and can further include an infrared blocking filter F and an image sensor (i.e., an imaging plane IP) disposed on the image side of the eighth lens 580. In addition, the optical imaging system 500 can further include a stop ST disposed between the object side surface and the image side surface of the first lens 510. In addition, the optical imaging system 500 can further include a spacer between the second lens 520 and the third lens 530.

[0174] The first lens 510 can have a positive refractive power. The object side surface of the first lens 510 can have a convex shape in a paraxial region, and the image side surface of the first lens 510 can have a concave shape in the paraxial region. The first lens 510 can be formed of a plastic material. In addition, the first lens 510 can be an aspherical lens. For example, the first lens 510 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0175] The second lens 520 can have a negative refractive power. The object side surface of the second lens 520 can have a convex shape in a paraxial region, and the image side surface of the second lens 520 can have a concave shape in the paraxial region. The second lens 520 can be formed of a plastic material. For example, the second lens 520 can be formed of a plastic material having optical characteristics (e.g., different refractive indices and Abbe numbers) different from those of the first lens 510. In addition, the second lens 520 can be an aspherical lens. For example, the second lens 520 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0176] The third lens 530 can have a negative refractive power. The object side surface of the third lens 530 can have a convex shape in a paraxial region, and the image side surface of the third lens 530 can have a concave shape in the paraxial region. The third lens 530 can be formed of a plastic material. For example, the third lens 530 can be formed of a plastic material having optical characteristics (e.g., the same refractive indices and Abbe numbers) identical to those of the second lens 520. In addition, the third lens 530 can be an aspherical lens. For example, the third lens 530 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0177] The fourth lens 540 can have a positive refractive power. The object side surface of the fourth lens 540 can have a concave shape in a paraxial region, and the image side surface of the fourth lens 540 can have a convex shape in the paraxial region. The fourth lens 540 can be formed of a plastic material. For example, the fourth lens 540 can be formed of a plastic material having optical characteristics (e.g., different refractive indices and Abbe numbers) different from those of the third lens 530. Meanwhile, the fourth lens 540 can be formed of a plastic material having optical characteristics (e.g., the same refractive indices and Abbe numbers) identical to those of the first lens 510. In addition, the fourth lens 540 can be an aspherical lens. For example, the fourth lens 540 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0178] The fifth lens 550 can have a negative refractive power. The object side surface of the fifth lens 550 can have a convex shape in the paraxial region, and the image side surface of the fifth lens 550 can have a concave shape in the paraxial region. The fifth lens 550 can be formed of a plastic material. For example, the fifth lens 550 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the fourth lens 540. In addition, the fifth lens 550 can be an aspherical lens. For example, the fifth lens 550 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0179] The sixth lens 560 can have a negative refractive power. The object side surface of the sixth lens 560 can have a convex shape in the paraxial region, and the image side surface of the sixth lens 560 can have a concave shape in the paraxial region. The sixth lens 560 can be formed of a plastic material. For example, the sixth lens 560 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the fifth lens 550. In addition, the sixth lens 560 can be an aspherical lens. For example, the sixth lens 560 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0180] The seventh lens 570 can have a positive refractive power. The object side surface and the image side surface of the seventh lens 570 can both have a convex shape in the paraxial region. The seventh lens 570 can be formed of a plastic material. For example, the seventh lens 570 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the sixth lens 560. In addition, the seventh lens 570 can be an aspherical lens. For example, the seventh lens 570 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0181] The eighth lens 580 can have a negative refractive power. The object side surface of the eighth lens 580 can have a convex shape in the paraxial region, and the image side surface of the eighth lens 580 can have a concave shape in the paraxial region. The eighth lens 580 can be formed of a plastic material. For example, the eighth lens 580 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the seventh lens 570. In addition, the eighth lens 580 can be an aspherical lens. For example, the eighth lens 580 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0182] Table 9 below shows optical parameters and physical parameters of the optical imaging system 500 according to the fifth embodiment of the disclosure.

[0183] Table 9

[0184]

[0185]

[0186] Table 10 below shows aspherical surface data of the optical imaging system 500 according to the fifth embodiment of the disclosure.

[0187] Table 10

[0188]

[0189]

[0190] Sixth embodiment

[0191] Figure 6A is a configuration diagram of an optical imaging system according to a sixth embodiment of the disclosure. Figure 6B is a graph showing aberration characteristics of an optical imaging system according to the sixth embodiment of the disclosure.

[0192] According to the sixth embodiment, the optical imaging system 600 can include a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, a fifth lens 650, a sixth lens 660, a seventh lens 670, and an eighth lens 680 arranged in this order from an object side, and can further include an infrared blocking filter F and an image sensor (i.e., an imaging plane IP) disposed on an image side of the eighth lens 680. In addition, the optical imaging system 600 can further include a stop ST disposed between an object side surface and an image side surface of the first lens 610. Furthermore, the optical imaging system 600 can further include a spacer between the second lens 620 and the third lens 630.

[0193] The first lens 610 can have a positive refractive power. An object side surface of the first lens 610 can have a convex shape in a paraxial region, and an image side surface of the first lens 610 can have a concave shape in the paraxial region. The first lens 610 can be formed of a plastic material. Furthermore, the first lens 610 can be an aspherical lens. For example, the first lens 610 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0194] The second lens 620 can have a negative refractive power. The object side surface of the second lens 620 can have a convex shape in the paraxial region, and the image side surface of the second lens 620 can have a concave shape in the paraxial region. The second lens 620 can be formed of a plastic material. For example, the second lens 620 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the first lens 610. Also, the second lens 620 can be an aspheric lens. For example, the second lens 620 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0195] The third lens 630 can have a negative refractive power. The object side surface of the third lens 630 can have a convex shape in the paraxial region, and the image side surface of the third lens 630 can have a concave shape in the paraxial region. The third lens 630 can be formed of a plastic material. For example, the third lens 630 can be formed of a plastic material having optical properties (e.g., the same refractive indices and Abbe numbers) identical to those of the second lens 620. Also, the third lens 630 can be an aspheric lens. For example, the third lens 630 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0196] The fourth lens 640 can have a positive refractive power. The object side surface of the fourth lens 640 can have a concave shape in the paraxial region, and the image side surface of the fourth lens 640 can have a convex shape in the paraxial region. The fourth lens 640 can be formed of a plastic material. For example, the fourth lens 640 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the third lens 630. Meanwhile, the fourth lens 640 can be formed of a plastic material having optical properties (e.g., the same refractive indices and Abbe numbers) identical to those of the first lens 610. Also, the fourth lens 640 can be an aspheric lens. For example, the fourth lens 640 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0197] The fifth lens 650 can have a negative refractive power. The object side surface of the fifth lens 650 can have a convex shape in the paraxial region, and the image side surface of the fifth lens 650 can have a concave shape in the paraxial region. The fifth lens 650 can be formed of a plastic material. For example, the fifth lens 650 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the fourth lens 640. Also, the fifth lens 650 can be an aspheric lens. For example, the fifth lens 650 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0198] The sixth lens 660 can have a negative refractive power. The object side surface of the sixth lens 660 can have a convex shape in the paraxial region, and the image side surface of the sixth lens 660 can have a concave shape in the paraxial region. The sixth lens 660 can be formed of a plastic material. For example, the sixth lens 660 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the fifth lens 650. In addition, the sixth lens 660 can be an aspheric lens. For example, the sixth lens 660 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0199] The seventh lens 670 can have a positive refractive power. Both the object side surface and the image side surface of the seventh lens 670 can have a convex shape in the paraxial region. The seventh lens 670 can be formed of a plastic material. For example, the seventh lens 670 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the sixth lens 660. In addition, the seventh lens 670 can be an aspheric lens. For example, the seventh lens 670 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0200] The eighth lens 680 can have a negative refractive power. The object side surface of the eighth lens 680 can have a convex shape in the paraxial region, and the image side surface of the eighth lens 680 can have a concave shape in the paraxial region. The eighth lens 680 can be formed of a plastic material. For example, the eighth lens 680 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the seventh lens 670. In addition, the eighth lens 680 can be an aspheric lens. For example, the eighth lens 680 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0201] Table 11 below shows optical and physical parameters of the optical imaging system 600 according to the sixth embodiment of the disclosure.

[0202] Table 11

[0203]

[0204]

[0205] Table 12 below shows aspheric data of the optical imaging system 600 according to the sixth embodiment of the disclosure.

[0206] Table 12

[0207]

[0208]

[0209] Seventh embodiment

[0210] Figure 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 an aberration characteristic of an optical imaging system according to the seventh embodiment of the present disclosure.

[0211] According to the seventh embodiment, the optical imaging system 700 can include, arranged in order from the object side, 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, and can further include an infrared blocking filter F and an image sensor (i.e., an imaging plane IP) provided on the image side of the eighth lens 780. In addition, the optical imaging system 700 can further include a stop ST provided between the object side and the image side of the first lens 710. Furthermore, the optical imaging system 700 can further include a spacer between the second lens 720 and the third lens 730.

[0212] The first lens 710 can have a positive refractive power. The object side surface of the first lens 710 can have a convex shape in the paraxial region, and the image side surface of the first lens 710 can have a concave shape in the paraxial region. The first lens 710 can be formed of a plastic material. In addition, the first lens 710 can be an aspherical lens. For example, the first lens 710 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0213] The second lens 720 can have a negative refractive power. The object side surface of the second lens 720 can have a convex shape in the paraxial region, and the image side surface of the second lens 720 can have a concave shape in the paraxial region. The second lens 720 can be formed of a plastic material. For example, the second lens 720 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) different from those of the first lens 710. In addition, the second lens 720 can be an aspherical lens. For example, the second lens 720 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0214] The third lens 730 can have a positive refractive power. The object side surface of the third lens 730 can have a convex shape in the paraxial region, and the image side surface of the third lens 730 can have a concave shape in the paraxial region. The third lens 730 can be formed of a plastic material. For example, the third lens 730 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) identical to those of the second lens 720. Furthermore, the third lens 730 can be an aspherical lens. For example, the third lens 730 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0215] The fourth lens 740 can have a positive refractive power. The object side surface of the fourth lens 740 can have a concave shape in the paraxial region, and the image side surface of the fourth lens 740 can have a convex shape in the paraxial region. The fourth lens 740 can be formed of a plastic material. For example, the fourth lens 740 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the third lens 730. Meanwhile, the fourth lens 740 can be formed of a plastic material having optical properties (e.g., the same refractive indices and Abbe numbers) identical to those of the first lens 710. In addition, the fourth lens 740 can be an aspheric lens. For example, the fourth lens 740 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0216] The fifth lens 750 can have a negative refractive power. The object side surface of the fifth lens 750 can have a convex shape in the paraxial region, and the image side surface of the fifth lens 750 can have a concave shape in the paraxial region. The fifth lens 750 can be formed of a plastic material. For example, the fifth lens 750 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the fourth lens 740. In addition, the fifth lens 750 can be an aspheric lens. For example, the fifth lens 750 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0217] The sixth lens 760 can have a negative refractive power. The object side surface of the sixth lens 760 can have a convex shape in the paraxial region, and the image side surface of the sixth lens 760 can have a concave shape in the paraxial region. The sixth lens 760 can be formed of a plastic material. For example, the sixth lens 760 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the fifth lens 750. In addition, the sixth lens 760 can be an aspheric lens. For example, the sixth lens 760 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0218] The seventh lens 770 can have a positive refractive power. The object side surface and the image side surface of the seventh lens 770 can both have a convex shape in the paraxial region. The seventh lens 770 can be formed of a plastic material. For example, the seventh lens 770 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the sixth lens 760. In addition, the seventh lens 770 can be an aspheric lens. For example, the seventh lens 770 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0219] The eighth lens 780 can have a negative refractive power. The object side surface of the eighth lens 780 can have a convex shape in the paraxial region, and the image side surface of the eighth lens 780 can have a concave shape in the paraxial region. The eighth lens 780 can be formed of a plastic material. For example, the eighth lens 780 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the seventh lens 770. In addition, the eighth lens 780 can be an aspheric lens. For example, the eighth lens 780 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0220] Table 13 below shows optical and physical parameters of the optical imaging system 700 according to the seventh embodiment of the disclosure.

[0221] Table 13

[0222]

[0223]

[0224] Table 14 below shows aspheric data of the optical imaging system 700 according to the seventh embodiment of the disclosure.

[0225] Table 14

[0226]

[0227]

[0228] Eighth embodiment

[0229] Figure 8A is a configuration diagram of an optical imaging system according to an eighth embodiment of the disclosure. Figure 8B is a graph showing aberration characteristics of an optical imaging system according to the eighth embodiment of the disclosure.

[0230] According to the eighth embodiment, the optical imaging system 800 can include, arranged in order from the object side, 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, and can further include an infrared blocking filter F and an image sensor (i.e., an imaging plane IP) disposed on the image side of the eighth lens 880. In addition, the optical imaging system 800 can further include a stop ST disposed between the object side surface and the image side surface of the first lens 810. In addition, the optical imaging system 800 can further include a spacer between the second lens 820 and the third lens 830.

[0231] The first lens 810 can have a positive refractive power. The object side surface of the first lens 810 can have a convex shape in a paraxial region, and the image side surface of the first lens 810 can have a concave shape in the paraxial region. The first lens 810 can be formed of a plastic material. In addition, the first lens 810 can be an aspherical lens. For example, the first lens 810 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0232] The second lens 820 can have a negative refractive power. The object side surface of the second lens 820 can have a convex shape in a paraxial region, and the image side surface of the second lens 820 can have a concave shape in the paraxial region. The second lens 820 can be formed of a plastic material. For example, the second lens 820 can be formed of a plastic material having optical characteristics (e.g., different refractive indices and Abbe numbers) different from those of the first lens 810. In addition, the second lens 820 can be an aspherical lens. For example, the second lens 820 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0233] The third lens 830 can have a negative refractive power. The object side surface of the third lens 830 can have a convex shape in a paraxial region, and the image side surface of the third lens 830 can have a concave shape in the paraxial region. The third lens 830 can be formed of a plastic material. For example, the third lens 830 can be formed of a plastic material having optical characteristics (e.g., the same refractive indices and Abbe numbers) identical to those of the second lens 820. In addition, the third lens 830 can be an aspherical lens. For example, the third lens 830 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0234] The fourth lens 840 can have a positive refractive power. The object side surface of the fourth lens 840 can have a concave shape in a paraxial region, and the image side surface of the fourth lens 840 can have a convex shape in the paraxial region. The fourth lens 840 can be formed of a plastic material. For example, the fourth lens 840 can be formed of a plastic material having optical characteristics (e.g., different refractive indices and Abbe numbers) different from those of the third lens 830. Meanwhile, the fourth lens 840 can be formed of a plastic material having optical characteristics (e.g., the same refractive indices and Abbe numbers) identical to those of the first lens 810. In addition, the fourth lens 840 can be an aspherical lens. For example, the fourth lens 840 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0235] The fifth lens 850 can have a negative refractive power. The object side surface of the fifth lens 850 can have a convex shape in the paraxial region, and the image side surface of the fifth lens 850 can have a concave shape in the paraxial region. The fifth lens 850 can be formed of a plastic material. For example, the fifth lens 850 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the fourth lens 840. In addition, the fifth lens 850 can be an aspherical lens. For example, the fifth lens 850 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0236] The sixth lens 860 can have a positive refractive power. The object side surface of the sixth lens 860 can have a convex shape in the paraxial region, and the image side surface of the sixth lens 860 can have a concave shape in the paraxial region. The sixth lens 860 can be formed of a plastic material. For example, the sixth lens 860 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the fifth lens 850. In addition, the sixth lens 860 can be an aspherical lens. For example, the sixth lens 860 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0237] The seventh lens 870 can have a positive refractive power. The object side surface and the image side surface of the seventh lens 870 can both have a convex shape in the paraxial region. The seventh lens 870 can be formed of a plastic material. For example, the seventh lens 870 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the sixth lens 860. In addition, the seventh lens 870 can be an aspherical lens. For example, the seventh lens 870 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0238] The eighth lens 880 can have a negative refractive power. The object side surface of the eighth lens 880 can have a convex shape in the paraxial region, and the image side surface of the eighth lens 880 can have a concave shape in the paraxial region. The eighth lens 880 can be formed of a plastic material. For example, the eighth lens 880 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the seventh lens 870. In addition, the eighth lens 880 can be an aspherical lens. For example, the eighth lens 880 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0239] Table 15 below shows optical parameters and physical parameters of the optical imaging system 800 according to the eighth embodiment of the disclosure.

[0240] Table 15

[0241]

[0242]

[0243] Table 16 below shows aspherical surface data of the optical imaging system 800 according to the eighth embodiment of the disclosure.

[0244] Table 16

[0245]

[0246]

[0247] Ninth embodiment

[0248] Figure 9A is a configuration diagram of an optical imaging system according to a ninth embodiment of the disclosure. Figure 9B is a graph showing aberration characteristics of an optical imaging system according to the ninth embodiment of the disclosure.

[0249] According to the ninth embodiment, the optical imaging system 900 can include a first lens 910, a second lens 920, a third lens 930, a fourth lens 940, a fifth lens 950, a sixth lens 960, a seventh lens 970, and an eighth lens 980 arranged in this order from the object side, and can further include an infrared blocking filter F and an image sensor (i.e., an imaging plane IP) provided on the image side of the eighth lens 980. In addition, the optical imaging system 900 can further include a stop ST provided between the object side surface and the image side surface of the first lens 910. Furthermore, the optical imaging system 900 can further include a spacer between the second lens 920 and the third lens 930.

[0250] The first lens 910 can have a positive refractive power. The object side surface of the first lens 910 can have a convex shape in the paraxial region, and the image side surface of the first lens 910 can have a concave shape in the paraxial region. The first lens 910 can be formed of a plastic material. In addition, the first lens 910 can be an aspherical lens. For example, the first lens 910 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0251] The second lens 920 can have a negative refractive power. The object side surface of the second lens 920 can have a convex shape in the paraxial region, and the image side surface of the second lens 920 can have a concave shape in the paraxial region. The second lens 920 can be formed of a plastic material. For example, the second lens 920 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the first lens 910. In addition, the second lens 920 can be an aspheric lens. For example, the second lens 920 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0252] The third lens 930 can have a negative refractive power. The object side surface of the third lens 930 can have a convex shape in the paraxial region, and the image side surface of the third lens 930 can have a concave shape in the paraxial region. The third lens 930 can be formed of a plastic material. For example, the third lens 930 can be formed of a plastic material having optical properties (e.g., the same refractive indices and Abbe numbers) identical to those of the second lens 920. In addition, the third lens 930 can be an aspheric lens. For example, the third lens 930 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0253] The fourth lens 940 can have a positive refractive power. The object side surface of the fourth lens 940 can have a concave shape in the paraxial region, and the image side surface of the fourth lens 940 can have a convex shape in the paraxial region. The fourth lens 940 can be formed of a plastic material. For example, the fourth lens 940 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the third lens 930. Meanwhile, the fourth lens 940 can be formed of a plastic material having optical properties (e.g., the same refractive indices and Abbe numbers) identical to those of the first lens 910. In addition, the fourth lens 940 can be an aspheric lens. For example, the fourth lens 940 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0254] The fifth lens 950 can have a negative refractive power. The object side surface of the fifth lens 950 can have a convex shape in the paraxial region, and the image side surface of the fifth lens 950 can have a concave shape in the paraxial region. The fifth lens 950 can be formed of a plastic material. For example, the fifth lens 950 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the fourth lens 940. In addition, the fifth lens 950 can be an aspheric lens. For example, the fifth lens 950 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0255] The sixth lens 960 can have a positive refractive power. The object side surface of the sixth lens 960 can have a convex shape in the paraxial region, and the image side surface of the sixth lens 960 can have a concave shape in the paraxial region. The sixth lens 960 can be formed of a plastic material. For example, the sixth lens 960 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the fifth lens 950. In addition, the sixth lens 960 can be an aspherical lens. For example, the sixth lens 960 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0256] The seventh lens 970 can have a positive refractive power. Both the object side surface and the image side surface of the seventh lens 970 can have a convex shape in the paraxial region. The seventh lens 970 can be formed of a plastic material. For example, the seventh lens 970 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the sixth lens 960. In addition, the seventh lens 970 can be an aspherical lens. For example, the seventh lens 970 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0257] The eighth lens 980 can have a negative refractive power. The object side surface of the eighth lens 980 can have a convex shape in the paraxial region, and the image side surface of the eighth lens 980 can have a concave shape in the paraxial region. The eighth lens 980 can be formed of a plastic material. For example, the eighth lens 980 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the seventh lens 970. In addition, the eighth lens 980 can be an aspherical lens. For example, the eighth lens 980 can be a biconcave aspherical lens whose object side surface and image side surface are both aspherical.

[0258] Table 17 below shows optical and physical parameters of the optical imaging system 900 according to the ninth embodiment of the disclosure.

[0259] Table 17

[0260]

[0261]

[0262] Table 18 below shows aspherical data of the optical imaging system 900 according to the ninth embodiment of the disclosure.

[0263] Table 18

[0264]

[0265]

[0266] Tenth embodiment

[0267] Figure 10A is a configuration diagram of an optical imaging system according to the tenth embodiment of the present disclosure. Figure 10B is a graph showing aberration characteristics of an optical imaging system according to the tenth embodiment of the present disclosure.

[0268] According to the tenth embodiment, the optical imaging system 1000 can include, arranged in order from the object side, 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, and can further include an infrared blocking filter F and an image sensor (i.e., an imaging plane IP) disposed on the image side of the eighth lens 1080. In addition, the optical imaging system 1000 can further include a stop ST disposed between the object side face and the image side face of the first lens 1010. Furthermore, the optical imaging system 1000 can further include a spacer between the second lens 1020 and the third lens 1030.

[0269] The first lens 1010 can have a positive refractive power. The object side face of the first lens 1010 can have a convex shape in the paraxial region, and the image side face of the first lens 1010 can have a concave shape in the paraxial region. The first lens 1010 can be formed of a plastic material. In addition, the first lens 1010 can be an aspherical lens. For example, the first lens 1010 can be a double aspherical lens whose object side face and image side face are both aspherical.

[0270] The second lens 1020 can have a negative refractive power. The object side face of the second lens 1020 can have a convex shape in the paraxial region, and the image side face of the second lens 1020 can have a concave shape in the paraxial region. The second lens 1020 can be formed of a plastic material. For example, the second lens 1020 can be formed of a plastic material having optical characteristics (e.g., different refractive indices and Abbe numbers) different from those of the first lens 1010. In addition, the second lens 1020 can be an aspherical lens. For example, the second lens 1020 can be a double aspherical lens whose object side face and image side face are both aspherical.

[0271] The third lens 1030 can have a negative refractive power. The object side surface of the third lens 1030 can have a convex shape in the paraxial region, and the image side surface of the third lens 1030 can have a concave shape in the paraxial region. The third lens 1030 can be formed of a plastic material. For example, the third lens 1030 can be formed of a plastic material having the same optical characteristics (e.g., the same refractive index and Abbe number) as the optical characteristics of the second lens 1020. In addition, the third lens 1030 can be an aspheric lens. For example, the third lens 1030 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric surfaces.

[0272] The fourth lens 1040 can have a positive refractive power. The object side surface of the fourth lens 1040 can have a concave shape in the paraxial region, and the image side surface of the fourth lens 1040 can have a convex shape in the paraxial region. The fourth lens 1040 can be formed of a plastic material. For example, the fourth lens 1040 can be formed of a plastic material having different optical characteristics (e.g., different refractive index and Abbe number) from the optical characteristics of the third lens 1030. Meanwhile, the fourth lens 1040 can be formed of a plastic material having the same optical characteristics (e.g., the same refractive index and Abbe number) as the optical characteristics of the first lens 1010. In addition, the fourth lens 1040 can be an aspheric lens. For example, the fourth lens 1040 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric surfaces.

[0273] The fifth lens 1050 can have a negative refractive power. The object side surface of the fifth lens 1050 can have a convex shape in the paraxial region, and the image side surface of the fifth lens 1050 can have a concave shape in the paraxial region. The fifth lens 1050 can be formed of a plastic material. For example, the fifth lens 1050 can be formed of a plastic material having different optical characteristics (e.g., different refractive index and Abbe number) from the optical characteristics of the fourth lens 1040. In addition, the fifth lens 1050 can be an aspheric lens. For example, the fifth lens 1050 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric surfaces.

[0274] The sixth lens 1060 can have a positive refractive power. The object side surface of the sixth lens 1060 can have a convex shape in the paraxial region, and the image side surface of the sixth lens 1060 can have a concave shape in the paraxial region. The sixth lens 1060 can be formed of a plastic material. For example, the sixth lens 1060 can be formed of a plastic material having different optical characteristics (e.g., different refractive index and Abbe number) from the optical characteristics of the fifth lens 1050. In addition, the sixth lens 1060 can be an aspheric lens. For example, the sixth lens 1060 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric surfaces.

[0275] The seventh lens 1070 can have a positive refractive power. Both the object side surface and the image side surface of the seventh lens 1070 can have convex shapes in the paraxial region. The seventh lens 1070 can be formed of a plastic material. For example, the seventh lens 1070 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the sixth lens 1060. In addition, the seventh lens 1070 can be an aspherical lens. For example, the seventh lens 1070 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0276] The eighth lens 1080 can have a negative refractive power. The object side surface of the eighth lens 1080 can have a convex shape in the paraxial region, and the image side surface of the eighth lens 1080 can have a concave shape in the paraxial region. The eighth lens 1080 can be formed of a plastic material. For example, the eighth lens 1080 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the seventh lens 1070. In addition, the eighth lens 1080 can be an aspherical lens. For example, the eighth lens 1080 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0277] Table 19 below shows optical and physical parameters of the optical imaging system 1000 according to the tenth embodiment of the disclosure.

[0278] Table 19

[0279]

[0280]

[0281] Table 20 below shows aspherical data of the optical imaging system 1000 according to the tenth embodiment of the disclosure.

[0282] Table 20

[0283]

[0284]

[0285] Eleventh embodiment

[0286] Figure 11A is a configuration diagram of an optical imaging system according to an eleventh embodiment of the disclosure. Figure 11B is a graph showing aberration characteristics of an optical imaging system according to the eleventh embodiment of the disclosure.

[0287] According to the eleventh embodiment, the optical imaging system 1100 can include, arranged in order from the object side, a first lens 1110, a second lens 1120, a third lens 1130, a fourth lens 1140, a fifth lens 1150, a sixth lens 1160, a seventh lens 1170, and an eighth lens 1180, and can further include an infrared blocking filter F and an image sensor (i.e., an imaging plane IP) disposed on the image side of the eighth lens 1180. In addition, the optical imaging system 1100 can further include a stop ST disposed between the object side face and the image side face of the first lens 1110. Furthermore, the optical imaging system 1100 can further include a spacer between the second lens 1120 and the third lens 1130.

[0288] The first lens 1110 can have a positive refractive power. The object side face of the first lens 1110 can have a convex shape in the paraxial region, and the image side face of the first lens 1110 can have a concave shape in the paraxial region. The first lens 1110 can be formed of a plastic material. In addition, the first lens 1110 can be an aspherical lens. For example, the first lens 1110 can be a double aspherical lens whose object side face and image side face are both aspherical.

[0289] The second lens 1120 can have a negative refractive power. The object side face of the second lens 1120 can have a convex shape in the paraxial region, and the image side face of the second lens 1120 can have a concave shape in the paraxial region. The second lens 1120 can be formed of a plastic material. For example, the second lens 1120 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) different from those of the first lens 1110. In addition, the second lens 1120 can be an aspherical lens. For example, the second lens 1120 can be a double aspherical lens whose object side face and image side face are both aspherical.

[0290] The third lens 1130 can have a negative refractive power. The object side face of the third lens 1130 can have a convex shape in the paraxial region, and the image side face of the third lens 1130 can have a concave shape in the paraxial region. The third lens 1130 can be formed of a plastic material. For example, the third lens 1130 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) identical to those of the second lens 1120. In addition, the third lens 1130 can be an aspherical lens. For example, the third lens 1130 can be a double aspherical lens whose object side face and image side face are both aspherical.

[0291] The fourth lens 1140 can have a positive refractive power. The object side surface of the fourth lens 1140 can have a concave shape in the paraxial region, and the image side surface of the fourth lens 1140 can have a convex shape in the paraxial region. The fourth lens 1140 can be formed of a plastic material. For example, the fourth lens 1140 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the third lens 1130. Meanwhile, the fourth lens 1140 can be formed of a plastic material having optical properties (e.g., the same refractive indices and Abbe numbers) the same as those of the first lens 1110. In addition, the fourth lens 1140 can be an aspheric lens. For example, the fourth lens 1140 can be a biaxial aspheric lens whose object side surface and image side surface are both aspheric.

[0292] The fifth lens 1150 can have a negative refractive power. The object side surface of the fifth lens 1150 can have a convex shape in the paraxial region, and the image side surface of the fifth lens 1150 can have a concave shape in the paraxial region. The fifth lens 1150 can be formed of a plastic material. For example, the fifth lens 1150 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the fourth lens 1140. In addition, the fifth lens 1150 can be an aspheric lens. For example, the fifth lens 1150 can be a biaxial aspheric lens whose object side surface and image side surface are both aspheric.

[0293] The sixth lens 1160 can have a positive refractive power. The object side surface of the sixth lens 1160 can have a convex shape in the paraxial region, and the image side surface of the sixth lens 1160 can have a concave shape in the paraxial region. The sixth lens 1160 can be formed of a plastic material. For example, the sixth lens 1160 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the fifth lens 1150. In addition, the sixth lens 1160 can be an aspheric lens. For example, the sixth lens 1160 can be a biaxial aspheric lens whose object side surface and image side surface are both aspheric.

[0294] The seventh lens 1170 can have a positive refractive power. The object side surface and the image side surface of the seventh lens 1170 can both have a convex shape in the paraxial region. The seventh lens 1170 can be formed of a plastic material. For example, the seventh lens 1170 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the sixth lens 1160. In addition, the seventh lens 1170 can be an aspheric lens. For example, the seventh lens 1170 can be a biaxial aspheric lens whose object side surface and image side surface are both aspheric.

[0295] The eighth lens 1180 can have a negative refractive power. The object side surface of the eighth lens 1180 can have a convex shape in the paraxial region, and the image side surface of the eighth lens 1180 can have a concave shape in the paraxial region. The eighth lens 1180 can be formed of a plastic material. For example, the eighth lens 1180 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from the optical properties of the seventh lens 1170. In addition, the eighth lens 1180 can be an aspheric lens. For example, the eighth lens 1180 can be a biconvex aspheric lens whose object side surface and image side surface are both aspheric.

[0296] Table 21 below shows optical and physical parameters of the optical imaging system 1100 according to the eleventh embodiment of the disclosure.

[0297] Table 21

[0298]

[0299]

[0300] Table 22 below shows aspheric data of the optical imaging system 1100 according to the eleventh embodiment of the disclosure.

[0301] Table 22

[0302]

[0303]

[0304] Twelfth embodiment

[0305] Figure 12A is a configuration diagram of an optical imaging system according to a twelfth embodiment of the disclosure. Figure 12B is a graph showing aberration characteristics of an optical imaging system according to the twelfth embodiment of the disclosure.

[0306] According to the twelfth embodiment, the optical imaging system 1200 can include, arranged in order from the object side, a first lens 1210, a second lens 1220, a third lens 1230, a fourth lens 1240, a fifth lens 1250, a sixth lens 1260, a seventh lens 1270, and an eighth lens 1280, and can further include an infrared blocking filter F and an image sensor (i.e., an imaging plane IP) disposed on the image side of the eighth lens 1280. In addition, the optical imaging system 1200 can further include an aperture ST disposed between the object side surface and the image side surface of the first lens 1210. Furthermore, the optical imaging system 1200 can further include a spacer between the second lens 1220 and the third lens 1230.

[0307] The first lens 1210 can have a positive refractive power. The object side surface of the first lens 1210 can have a convex shape in the paraxial region, and the image side surface of the first lens 1210 can have a concave shape in the paraxial region. The first lens 1210 can be formed of a plastic material. In addition, the first lens 1210 can be an aspherical lens. For example, the first lens 1210 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0308] The second lens 1220 can have a negative refractive power. The object side surface of the second lens 1220 can have a convex shape in the paraxial region, and the image side surface of the second lens 1220 can have a concave shape in the paraxial region. The second lens 1220 can be formed of a plastic material. For example, the second lens 1220 can be formed of a plastic material having optical characteristics (e.g., different refractive indices and Abbe numbers) different from those of the first lens 1210. In addition, the second lens 1220 can be an aspherical lens. For example, the second lens 1220 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0309] The third lens 1230 can have a negative refractive power. The object side surface of the third lens 1230 can have a convex shape in the paraxial region, and the image side surface of the third lens 1230 can have a concave shape in the paraxial region. The third lens 1230 can be formed of a plastic material. For example, the third lens 1230 can be formed of a plastic material having optical characteristics (e.g., the same refractive indices and Abbe numbers) identical to those of the second lens 1220. In addition, the third lens 1230 can be an aspherical lens. For example, the third lens 1230 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0310] The fourth lens 1240 can have a positive refractive power. The object side surface of the fourth lens 1240 can have a concave shape in the paraxial region, and the image side surface of the fourth lens 1240 can have a convex shape in the paraxial region. The fourth lens 1240 can be formed of a plastic material. For example, the fourth lens 1240 can be formed of a plastic material having optical characteristics (e.g., different refractive indices and Abbe numbers) different from those of the third lens 1230. Meanwhile, the fourth lens 1240 can be formed of a plastic material having optical characteristics (e.g., the same refractive indices and Abbe numbers) identical to those of the first lens 1210. In addition, the fourth lens 1240 can be an aspherical lens. For example, the fourth lens 1240 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0311] The fifth lens 1250 can have a negative refractive power. The object side surface of the fifth lens 1250 can have a convex shape in the paraxial region, and the image side surface of the fifth lens 1250 can have a concave shape in the paraxial region. The fifth lens 1250 can be formed of a plastic material. For example, the fifth lens 1250 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the fourth lens 1240. In addition, the fifth lens 1250 can be an aspherical lens. For example, the fifth lens 1250 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0312] The sixth lens 1260 can have a positive refractive power. The object side surface of the sixth lens 1260 can have a convex shape in the paraxial region, and the image side surface of the sixth lens 1260 can have a concave shape in the paraxial region. The sixth lens 1260 can be formed of a plastic material. For example, the sixth lens 1260 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the fifth lens 1250. In addition, the sixth lens 1260 can be an aspherical lens. For example, the sixth lens 1260 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0313] The seventh lens 1270 can have a positive refractive power. The object side surface and the image side surface of the seventh lens 1270 can both have a convex shape in the paraxial region. The seventh lens 1270 can be formed of a plastic material. For example, the seventh lens 1270 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the sixth lens 1260. In addition, the seventh lens 1270 can be an aspherical lens. For example, the seventh lens 1270 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0314] The eighth lens 1280 can have a negative refractive power. The object side surface of the eighth lens 1280 can have a convex shape in the paraxial region, and the image side surface of the eighth lens 1280 can have a concave shape in the paraxial region. The eighth lens 1280 can be formed of a plastic material. For example, the eighth lens 1280 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the seventh lens 1270. In addition, the eighth lens 1280 can be an aspherical lens. For example, the eighth lens 1280 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0315] Table 23 below shows optical parameters and physical parameters of the optical imaging system 1200 according to the twelfth embodiment of the disclosure.

[0316] Table 23

[0317]

[0318]

[0319] Table 24 below shows aspherical surface data of the optical imaging system 1200 according to the twelfth embodiment of the present disclosure.

[0320] Table 24

[0321]

[0322]

[0323] Thirteenth embodiment

[0324] Figure 13A is a configuration diagram of an optical imaging system according to a thirteenth embodiment of the present disclosure. Figure 13B is a graph showing aberration characteristics of an optical imaging system according to the thirteenth embodiment of the present disclosure.

[0325] According to the thirteenth embodiment, the optical imaging system 1300 can include a first lens 1310, a second lens 1320, a third lens 1330, a fourth lens 1340, a fifth lens 1350, a sixth lens 1360, a seventh lens 1370, and an eighth lens 1380 arranged in this order from the object side, and can further include an infrared blocking filter F and an image sensor (i.e., an imaging plane IP) provided on the image side of the eighth lens 1380. In addition, the optical imaging system 1300 can further include a stop ST provided between the object side surface and the image side surface of the first lens 1310. Furthermore, the optical imaging system 1300 can further include a spacer between the second lens 1320 and the third lens 1330.

[0326] The first lens 1310 can have a positive refractive power. The object side surface of the first lens 1310 can have a convex shape in the paraxial region, and the image side surface of the first lens 1310 can have a concave shape in the paraxial region. The first lens 1310 can be formed of a plastic material. In addition, the first lens 1310 can be an aspherical lens. For example, the first lens 1310 can be a double aspherical lens whose object side surface and image side surface are both aspherical.

[0327] The second lens 1320 can have a negative refractive power. The object side surface of the second lens 1320 can have a convex shape in the paraxial region, and the image side surface of the second lens 1320 can have a concave shape in the paraxial region. The second lens 1320 can be formed of a plastic material. For example, the second lens 1320 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the first lens 1310. In addition, the second lens 1320 can be an aspherical lens. For example, the second lens 1320 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0328] The third lens 1330 can have a negative refractive power. The object side surface of the third lens 1330 can have a convex shape in the paraxial region, and the image side surface of the third lens 1330 can have a concave shape in the paraxial region. The third lens 1330 can be formed of a plastic material. For example, the third lens 1330 can be formed of a plastic material having optical properties (e.g., the same refractive indices and Abbe numbers) identical to those of the second lens 1320. In addition, the third lens 1330 can be an aspherical lens. For example, the third lens 1330 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0329] The fourth lens 1340 can have a positive refractive power. The object side surface of the fourth lens 1340 can have a concave shape in the paraxial region, and the image side surface of the fourth lens 1340 can have a convex shape in the paraxial region. The fourth lens 1340 can be formed of a plastic material. For example, the fourth lens 1340 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the third lens 1330. Meanwhile, the fourth lens 1340 can be formed of a plastic material having optical properties (e.g., the same refractive indices and Abbe numbers) identical to those of the first lens 1310. In addition, the fourth lens 1340 can be an aspherical lens. For example, the fourth lens 1340 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0330] The fifth lens 1350 can have a negative refractive power. The object side surface of the fifth lens 1350 can have a convex shape in the paraxial region, and the image side surface of the fifth lens 1350 can have a concave shape in the paraxial region. The fifth lens 1350 can be formed of a plastic material. For example, the fifth lens 1350 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the fourth lens 1340. In addition, the fifth lens 1350 can be an aspherical lens. For example, the fifth lens 1350 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0331] The sixth lens 1360 can have a positive refractive power. The object side surface of the sixth lens 1360 can have a convex shape in the paraxial region, and the image side surface of the sixth lens 1360 can have a concave shape in the paraxial region. The sixth lens 1360 can be formed of a plastic material. For example, the sixth lens 1360 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the fifth lens 1350. In addition, the sixth lens 1360 can be an aspherical lens. For example, the sixth lens 1360 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0332] The seventh lens 1370 can have a positive refractive power. Both the object side surface and the image side surface of the seventh lens 1370 can have a convex shape in the paraxial region. The seventh lens 1370 can be formed of a plastic material. For example, the seventh lens 1370 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the sixth lens 1360. In addition, the seventh lens 1370 can be an aspherical lens. For example, the seventh lens 1370 can be a biconvex aspherical lens whose object side surface and image side surface are both aspherical.

[0333] The eighth lens 1380 can have a negative refractive power. The object side surface of the eighth lens 1380 can have a convex shape in the paraxial region, and the image side surface of the eighth lens 1380 can have a concave shape in the paraxial region. The eighth lens 1380 can be formed of a plastic material. For example, the eighth lens 1380 can be formed of a plastic material having optical properties (e.g., different refractive indices and Abbe numbers) different from those of the seventh lens 1370. In addition, the eighth lens 1380 can be an aspherical lens. For example, the eighth lens 1380 can be a biconcave aspherical lens whose object side surface and image side surface are both aspherical.

[0334] Table 25 below shows optical parameters and physical parameters of the optical imaging system 1300 according to the thirteenth embodiment of the disclosure.

[0335] Table 25

[0336] Surface Radius of curvature Thickness / distance Refractive index Abbe number Object Infinity Infinity 1 Infinity -1.050 2 3.282 1.311 1.544 56.0 3 34.683 0.050 4 11.248 0.280 1.671 19.4 5 5.574 0.552 6 Infinity 0.000 7 9.921 0.230 1.671 19.4 8 9.432 0.264 9 -28.902 0.694 1.544 56.0 10 -9.247 0.050 11 11.953 0.250 1.651 21.5 12 7.005 0.427 13 16.696 0.687 1.567 37.4 14 18.682 0.431 15 3.961 1.020 1.544 56.0 16 -14.714 0.674 17 15.625 0.480 1.535 55.7 18 2.070 0.448 19 Infinity 0.210 1.517 64.2 20 Infinity 0.618 Imaging surface Infinity

[0337] Table 26 below shows aspherical data of the optical imaging system 1300 according to the thirteenth embodiment of the disclosure.

[0338] Table 26

[0339]

[0340]

[0341] Table 27 below shows optical parameters and physical parameter and condition expression related to a focal length of an optical imaging system according to an embodiment of the present disclosure.

[0342] Table 27:

[0343]

[0344]

[0345]

[0346] An optical imaging system according to the above-described exemplary embodiment of the present disclosure can be manufactured to be thinner than the size of an image sensor.

[0347] An aspect of the present disclosure is to provide an optical imaging system having a total track length shorter than the size of an image sensor. Meanwhile, an object of the present disclosure is to provide a bright optical imaging system.

[0348] While specific examples have been shown and described above, it will be apparent to those of ordinary skill in the art having the benefit of this disclosure that various changes in form and details can be made without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each example should be considered as being applicable to similar features or aspects in other examples. Proper results can be attained if the described techniques are performed in a different order, and / or if components in the described systems, architectures, devices, or circuits are combined in a different manner, and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of the present disclosure is defined not by the specific embodiments described above, but by the appended claims and their equivalents, and all variations within the scope of the claims and their equivalents are intended to be embraced.

Claims

1. An optical imaging system, characterized by, The optical imaging system includes: a first lens, a second lens, a third lens, a fourth lens having a convex image side surface, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged in order from an object side to an imaging surface, wherein {TTL / (2xIMG HT)}xFno < 1.000 and 1.000 < Fno < 1.600 are satisfied, wherein TTL is a distance on an optical axis from an object side surface of the first lens to the imaging surface, IMG HT is half of a diagonal length of the imaging surface, and Fno is an F number of the optical imaging system.

2. The optical imaging system according to claim 1, characterized in that the third lens has a positive refractive power.

3. The optical imaging system according to claim 1, characterized in that the sixth lens has a positive refractive power.

4. The optical imaging system according to claim 1, characterized in that 0 < v1-(v6+v7) / 2 < 30.00 are satisfied, wherein v1 is an Abbe number of the first lens, v6 is an Abbe number of the sixth lens, and v7 is an Abbe number of the seventh lens.

5. The optical imaging system according to claim 1, characterized in that 0 < f7 / f < 2.000 are satisfied, wherein f is a focal length of the optical imaging system, and f7 is a focal length of the seventh lens.

6. The optical imaging system according to claim 1, characterized in that -1.000 < f8 / f < 0 are satisfied, wherein f is a focal length of the optical imaging system, and f8 is a focal length of the eighth lens.

7. The optical imaging system according to claim 1, characterized in that the third lens has a negative refractive power.

8. The optical imaging system according to claim 1, characterized in that an Abbe number of the first lens and an Abbe number of the fourth lens are identical to each other.

9. The optical imaging system according to claim 1, characterized in that both of an object side surface and an image side surface of the seventh lens have a convex shape.

10. An optical imaging system characterized by, The 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 order from an object side to an imaging surface, wherein 0.500 ≤ TTL / (2xIMG HT) < 0.750 and 1.000 < Fno < 1.600 are satisfied, wherein TTL is a distance on an optical axis from an object side surface of the first lens to the imaging surface, IMG HT is half of a diagonal length of the imaging surface, and Fno is an F number of the optical imaging system.

11. The optical imaging system according to claim 10, characterized in that an Abbe number of the second lens and an Abbe number of the third lens are identical to each other.

12. The optical imaging system according to claim 10, characterized in that the seventh lens has a positive refractive power and a convex image side surface.

13. The optical imaging system according to claim 10, characterized in that the third lens has a negative refractive power, and the sixth lens has a positive refractive power.

14. The optical imaging system according to claim 10, characterized in that 1.100 ≤ TTL / f ≤ 1.400 are satisfied, wherein f is a focal length of the optical imaging system. 15.The optical imaging system of claim 10, characterized in that an Abbe number of the first lens and an Abbe number of the fourth lens are identical to each other. 16.The optical imaging system of claim 10, characterized in that satisfies {TTL / (2×IMG HT)}×Fno < 1.000.

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