Optical imaging system

Abstract

This disclosure relates to an optical imaging system. The optical imaging system includes a first lens with positive refractive power, a second lens with negative refractive power, a third lens with refractive power, a fourth lens with refractive power, a fifth lens with negative refractive power, a sixth lens with positive refractive power, a seventh lens with refractive power, and an eighth lens with negative refractive power. The first to eighth lenses are arranged sequentially from the object side, wherein 0.8 < FNO×(OAL / IMH) ≤ 1.0, where FNO (F-number) is a value representing the brightness of the optical imaging system, OAL is the distance from the object side of the first lens to the imaging plane on the optical axis, and IMH is the diagonal length of the imaging plane.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0201625, filed on December 31, 2024, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. Technical Field

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

[0004] Mobile device cameras can include image sensors with between 13 million and 200 million pixels. The design of mobile device lenses can be optimized to accommodate such high-resolution image sensors.

[0005] As the size of image sensors generally increases, the overall length of optical systems is also likely to increase. However, since mobile devices are manufactured with a thin profile, there is a need to develop optical systems that offer high performance while maintaining a reduced thickness.

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

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

[0008] In a general sense, the optical imaging system includes a first lens with positive refractive power, a second lens with negative refractive power, a third lens with refractive power, a fourth lens with refractive power, a fifth lens with negative refractive power, a sixth lens with positive refractive power, a seventh lens with refractive power, and an eighth lens with negative refractive power. The first to eighth lenses are arranged sequentially from the object side, wherein 0.8 < FNO×(OAL / IMH) ≤ 1.0, where FNO (F-number) is a value representing the brightness of the optical imaging system, OAL is the distance from the object side of the first lens to the imaging plane along the optical axis, and IMH is the diagonal length of the imaging plane.

[0009] The third lens can have positive refractive power, and the image-side surface of the third lens can be concave.

[0010] The fourth lens can have negative refractive power.

[0011] The fourth lens can have a convex object side and a concave image side.

[0012] The seventh lens can have positive refractive power, and satisfy 2 < f7 / f < 5, where f7 is the focal length of the seventh lens and f is the total focal length of the optical imaging system.

[0013] The eighth lens may have a convex object-side surface.

[0014] An optical imaging system can satisfy 0 < f1 / f < 1, where f1 is the focal length of the first lens and f is the total focal length of the optical imaging system.

[0015] Optical imaging systems can meet 15 < FOV×IMH / f < 18 Where FOV is the field of view of the optical imaging system, and f is the total focal length of the optical imaging system.

[0016] An optical imaging system can satisfy 1.0 < OAL / f < 1.2, where f is the total focal length of the optical imaging system.

[0017] An optical imaging system can satisfy 10 < V1-(V6+V7) / 2 < 30, 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.

[0018] In another 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 at predetermined intervals. The Abbe number of each of the second and fourth lenses is less than 20, wherein 15 satisfies... < FOV×IMH / f < 18 Where FOV is the field of view of the optical imaging system, and f is the total focal length of the optical imaging system.

[0019] The optical imaging system may also include an aperture stop positioned between the third and fourth lenses.

[0020] In the optical imaging system, each of the three lenses from the first to the eighth lens can have a refractive index of 1.6 or higher.

[0021] An optical imaging system can satisfy -3 < f2 / f < -1 and -20 < f5 / f < -5, where f2 is the focal length of the second lens and f5 is the focal length of the fifth lens.

[0022] An optical imaging system can satisfy 1 < f6 / f < 6 and -1.1 < f8 / f < 0, where f6 is the focal length of the sixth lens and f8 is the focal length of the eighth lens.

[0023] The optical imaging system can satisfy 30 < V1-V4 < 45, where V1 is the Abbe number of the first lens and V4 is the Abbe number of the fourth lens.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0041] 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

[0042] In the following description, although examples of this disclosure will be described in detail with reference to the accompanying drawings, it should be noted that the examples are not limited thereto.

[0043] The following detailed embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein, except for operations that must occur in a specific order, as will become apparent upon understanding this disclosure. Furthermore, for clarity and brevity, descriptions of features well-known in the art may be omitted.

[0044] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein are provided merely to illustrate some of the many possible ways in which the methods, apparatuses, and / or systems described herein will become apparent upon understanding this disclosure.

[0045] Throughout this specification, when an element such as a layer, region, or substrate is described as being "on," "connected to," or "attached to" another element, the element may be directly "on," directly "connected to," or directly "attached to" the other element, or there may be one or more other elements between the element and the other element. Conversely, when an element is described as being "directly on," "directly connected to," or "directly attached to" another element, there are no other elements between the element and the other element.

[0046] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more items; similarly, “at least one” includes any one of the associated listed items and any combination of any two or more items.

[0047] Although terms such as “first,” “second,” and “third” may be used herein 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. Therefore, without departing from the teachings of the examples described herein, the first component, first part, first region, first layer, or first section mentioned in these examples may also be referred to as a second component, second part, second region, second layer, or second section.

[0048] Spatial relative terms such as “above,” “above,” “below,” and “under” may be used herein for descriptive convenience to describe the relationship of one element relative to another, as shown in the accompanying drawings. In addition to covering the orientation depicted in the drawings, these spatial relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “above” another element would be located “below” or “under” that other element. Thus, depending on the spatial orientation of the device, the term “above” covers both orientations of “above” and “below”. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0049] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the terms “a,” “an,” and “the” are intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0050] Due to manufacturing techniques and / or tolerances, the shapes shown in the accompanying drawings may vary. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include shape variations that occur during manufacturing.

[0051] It should be noted that in this document, the term "may" is used relative to examples, such as regarding what an example may include or implement, meaning that there exists at least one example that includes or implements such a feature, but not all examples are limited to this.

[0052] The features of the examples described herein can be combined in various ways that will become apparent upon understanding this disclosure. Furthermore, although the examples described herein have multiple configurations, other configurations that will become apparent upon understanding this disclosure are also possible.

[0053] In an embodiment, the first lens may refer to the lens closest to the object side, and the eighth lens may refer to the lens closest to the imaging surface (or image sensor).

[0054] Furthermore, in the embodiments, the units for the radius of curvature, thickness, distance, and focal length of the lens can be millimeters (mm), and the unit for the field of view can be degrees (°).

[0055] In the description relating to the shape of the lens in the embodiments, a convex surface may refer to a portion of the surface whose paraxial region (a narrow region near the optical axis) is convex, and a concave surface may refer to a portion of the surface whose paraxial region is concave. Therefore, even when a surface of the lens is described as having a convex shape, the edge portion of that surface may be concave. Similarly, even when a surface of the lens is described as having a concave shape, the edge portion of that surface may be convex.

[0056] The optical imaging system according to an embodiment may include eight lenses. For example, the optical imaging system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially from the object side. For example, the first lens to the eighth lens may be arranged sequentially from the object side at a predetermined interval.

[0057] However, the optical imaging system according to the embodiment may include more than eight lenses, and may also include other components if necessary.

[0058] The optical imaging system according to the embodiment may further include an image sensor configured to convert incident light from an object into an electrical signal.

[0059] In addition, for example, an optical imaging system may also include an infrared blocking filter (hereinafter referred to as "filter") configured to block infrared light incident on the image sensor.

[0060] Furthermore, for example, the optical imaging system may also include an aperture configured to adjust the amount of light. For example, the aperture may be disposed in at least one of these regions, namely, on the object side of the first lens, between the object side and the image side of the first lens, and between the third and fourth lenses.

[0061] The optical imaging system according to an embodiment may include lenses formed of a plastic material. For example, all of the first to eighth lenses may be formed of a plastic material.

[0062] According to an embodiment, at least one of the first to eighth lenses may have a shape with a recurve point. For example, at least one of the first to eighth lenses may include a recurve point on at least one of the object-side and image-side surfaces.

[0063] Furthermore, at least one of the first to eighth lenses may have an aspherical surface. For example, the object-side and image-side surfaces of the first to eighth lenses may be aspherical. The aspherical surface of the first to eighth lenses can be represented by Equation 1 below.

[0064] Equation 1:

[0065] In Equation 1, c is the curvature of the lens surface (the reciprocal of the radius of curvature), K is the quadratic constant, and Y is the distance from any point on the aspherical surface of the lens to the optical axis. Furthermore, constants A to H, J, and L to P are aspherical coefficients, and Z (SAG) is the distance along the optical axis between any point on the aspherical surface of the lens and the vertex of the aspherical surface.

[0066] The optical imaging system according to the embodiment can have a field of view (FOV) range similar to that of a wide-angle lens. For example, the optical imaging system according to the embodiment can have a field of view greater than 60° and less than 90°. Furthermore, preferably, the field of view can be greater than 80° and less than 90°.

[0067] The optical imaging system according to the embodiment can satisfy one or more of the following conditional expressions.

[0068] Conditional expression 1: 15 < FOV×IMH / f < 18

[0069] Conditional expression 2: 1.5 < FNO ≤ 1.8

[0070] Conditional expression 3: 0.5 < OAL / IMH < 0.6

[0071] Conditional expression 4: 0.8 < FNO×(OAL / IMH) ≤ 1.0

[0072] Conditional expression 5: 25 < V1 - V2 < 45

[0073] Conditional expression 6: 30 < V1-V4 < 45

[0074] Conditional expression 7: 10 < V1 - (V6 + V7) / 2 < 30

[0075] Conditional expression 8: 0 < f1 / f < 1

[0076] Conditional expression 9: -3 < f2 / f < -1

[0077] Conditional expression 10: 1 < |f3 / f| < 5

[0078] Conditional expression 11: 1 < |f4 / f| / 10 < 14

[0079] Conditional expression 12: -20 < f5 / f < -5

[0080] Conditional expression 13: 1 < f6 / f < 6

[0081] Conditional expression 14: 2 < f7 / f < 5

[0082] Conditional expression 15: -1.1 < f8 / f < 0

[0083] Conditional expression 16: -0.6 < f1 / f2 < 0

[0084] Conditional expression 17: 0 < f1 / f3 < 1

[0085] Conditional expression 18: 1.0 < OAL / f < 1.2

[0086] Conditional expression 19: 0.1 < BFL / f < 0.3

[0087] Conditional expression 20: 0 < D1 / f < 0.1

[0088] In the conditional expression, FOV is the field of view of the optical imaging system, FNO (F number) is the value representing the brightness of the optical imaging system, IMH is the diagonal length of the imaging surface of the image sensor (IMG HT in the attached figure can be half the diagonal length of the imaging surface of the image sensor), OAL is the distance on the optical axis from the object side of the first lens to the imaging surface, BFL is the distance on the optical axis from the image side of the eighth lens to the imaging surface, and D1 is the air gap between the first lens and the second lens (or the distance on the optical axis from the image side of the first lens to the object side of the second lens).

[0089] Furthermore, in the conditional expression, f is the total focal length of the optical imaging system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f7 is the focal length of the seventh lens, and f8 is the focal length of the eighth lens.

[0090] Furthermore, in the conditional expression, V1 is the Abbe number of the first lens, V2 is the Abbe number of the second lens, V4 is the Abbe number of the fourth lens, V6 is the Abbe number of the sixth lens, and V7 is the Abbe number of the seventh lens.

[0091] Conditional expression 1 can be related to the field of view and miniaturization of the optical imaging system. When conditional expression 1 is satisfied, the optical imaging system can have an appropriate field of view, reduced distortion aberrations, and can be miniaturized. Conditional expression 2 can be related to the brightness of the optical imaging system. Conditional expression 3 can be a thinning factor related to the miniaturization of the optical imaging system. Conditional expression 4 can be related to both the brightness and miniaturization of the optical imaging system. When conditional expression 4 is satisfied, the optical imaging system can achieve miniaturization while maintaining appropriate brightness.

[0092] Conditional expressions 5 through 7 can be related to the material of the lens included in the optical imaging system. When conditional expressions 5 through 7 are satisfied, chromatic aberration in the optical imaging system can be improved.

[0093] Conditions 8 through 15 are the ratios of the focal length of each lens to the total focal length of the optical imaging system. Conditions 16 and 17 are the ratios of the focal length of the second or third lens of the optical imaging system to the focal length of the first lens. When conditions 8 through 17 are satisfied, the optical imaging system can effectively correct aberrations.

[0094] Conditional expressions 18 and 19 can be related to the miniaturization of optical imaging systems, and conditional expression 20 can be related to design conditions for reducing chromatic aberration in optical imaging systems.

[0095] The optical imaging system according to an embodiment will be described below.

[0096] Figure 1A This is a configuration diagram showing the optical imaging system according to the first embodiment. Figure 1B This is a graph showing the aberration characteristics of the optical imaging system according to the first embodiment.

[0097] The optical imaging system 100 according to the first embodiment may sequentially include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, and an eighth lens 180 from the object side. The optical imaging system 100 according to the first embodiment may also include a filter F and an image sensor S having an imaging surface IP.

[0098] The first lens 110 may have positive refractive power. The object-side surface of the first lens 110 may be convex in the paraxial region, and the image-side surface of the first lens 110 may be concave in the paraxial region.

[0099] The second lens 120 may have negative refractive power. The object-side surface of the second lens 120 may be convex in the paraxial region, and the image-side surface of the second lens 120 may be concave in the paraxial region. The second lens 120 may be a high refractive index lens with a refractive index of 1.6 or higher.

[0100] The third lens 130 can have positive refractive power. The object side of the third lens 130 can be convex in the paraxial region, and the image side of the third lens 130 can be concave in the paraxial region.

[0101] The fourth lens 140 may have negative refractive power. The object-side surface of the fourth lens 140 may be convex in the paraxial region, and the image-side surface of the fourth lens 140 may be concave in the paraxial region. The fourth lens 140 may be a high refractive index lens with a refractive index of 1.6 or higher.

[0102] The fifth lens 150 can have negative refractive power. The object-side surface of the fifth lens 150 can be convex in the paraxial region, and the image-side surface of the fifth lens 150 can be concave in the paraxial region. The fifth lens 150 can be a high refractive index lens with a refractive index of 1.6 or higher.

[0103] The sixth lens 160 can have positive refractive power. The object-side surface of the sixth lens 160 can be convex in the paraxial region, and the image-side surface of the sixth lens 160 can be concave in the paraxial region.

[0104] The seventh lens 170 can have positive refractive power. The object-side surface of the seventh lens 170 can be convex in the paraxial region, and the image-side surface of the seventh lens 170 can be concave in the paraxial region.

[0105] The eighth lens 180 can have negative refractive power. The object-side surface of the eighth lens 180 can be convex in the paraxial region, and the image-side surface of the eighth lens 180 can be concave in the paraxial region.

[0106] According to the first embodiment, the Abbe number of each of the first lens 110, the third lens 130, and the eighth lens 180 can be 50 or more. The Abbe number of each of the second lens 120 and the fourth lens 140 can be less than 20. The Abbe number of each of the fifth lens 150, the sixth lens 160, and the seventh lens 170 can be 20 or more and less than 40.

[0107] According to the first embodiment, the first lens 110 to the eighth lens 180 can be formed of a plastic material. Furthermore, the object-side surface and image-side surface of the first lens 110 to the eighth lens 180 can be aspherical.

[0108] Table 1 lists the characteristics of each lens included in the optical imaging system 100 according to the first embodiment, and Table 2 lists the aspherical coefficients of each lens included in the optical imaging system 100 according to the first embodiment.

[0109] Table 1:

[0110] Table 2:

[0111] Figure 2A This is a configuration diagram showing an optical imaging system according to a second embodiment. Figure 2B This is a graph showing the aberration characteristics of the optical imaging system according to the second embodiment.

[0112] The optical imaging system 200 according to the second embodiment may sequentially 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 from the object side. The optical imaging system 200 according to the second embodiment may also include a filter F and an image sensor S having an imaging surface IP.

[0113] The first lens 210 can have positive refractive power. The object-side surface of the first lens 210 can be convex in the paraxial region, and the image-side surface of the first lens 210 can be concave in the paraxial region.

[0114] The second lens 220 may have negative refractive power. The object-side surface of the second lens 220 may be convex in the paraxial region, and the image-side surface of the second lens 220 may be concave in the paraxial region. The second lens 220 may be a high refractive index lens with a refractive index of 1.6 or higher.

[0115] The third lens 230 can have positive refractive power. The object-side surface of the third lens 230 can be convex in the paraxial region, and the image-side surface of the third lens 230 can be concave in the paraxial region.

[0116] The fourth lens 240 can have negative refractive power. The object-side surface of the fourth lens 240 can be concave in the paraxial region, and the image-side surface of the fourth lens 240 can be convex in the paraxial region. The fourth lens 240 can be a high refractive index lens with a refractive index of 1.6 or higher.

[0117] The fifth lens 250 can have negative refractive power. The object-side surface of the fifth lens 250 can be convex in the paraxial region, and the image-side surface of the fifth lens 250 can be concave in the paraxial region. The fifth lens 250 can be a high refractive index lens with a refractive index of 1.6 or higher.

[0118] The sixth lens 260 can have positive refractive power. The object-side surface of the sixth lens 260 can be convex in the paraxial region, and the image-side surface of the sixth lens 260 can be concave in the paraxial region.

[0119] The seventh lens 270 can have positive refractive power. The object-side surface of the seventh lens 270 can be convex in the paraxial region, and the image-side surface of the seventh lens 270 can be concave in the paraxial region.

[0120] The eighth lens 280 can have negative refractive power. The object-side surface of the eighth lens 280 can be convex in the paraxial region, and the image-side surface of the eighth lens 280 can be concave in the paraxial region.

[0121] According to the second embodiment, the Abbe number of each of the first lens 210, the third lens 230, and the eighth lens 280 can be 50 or more. The Abbe number of each of the second lens 220 and the fourth lens 240 can be less than 20. The Abbe number of each of the fifth lens 250, the sixth lens 260, and the seventh lens 270 can be 20 or more and less than 40.

[0122] According to the second embodiment, the first lens 210 to the eighth lens 280 can be formed of a plastic material. Furthermore, the object-side surface and image-side surface of the first lens 210 to the eighth lens 280 can be aspherical.

[0123] Table 3 lists the characteristics of each lens included in the optical imaging system 200 according to the second embodiment, and Table 4 lists the aspherical coefficients of each lens included in the optical imaging system 200 according to the second embodiment.

[0124] Table 3:

[0125] Table 4:

[0126] Figure 3A This is a configuration diagram showing an optical imaging system according to a third embodiment. Figure 3B This is a graph showing the aberration characteristics of the optical imaging system according to the third embodiment.

[0127] The optical imaging system 300 according to the third embodiment may sequentially 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 from the object side. The optical imaging system 300 according to the third embodiment may also include a filter F and an image sensor S having an imaging surface IP.

[0128] The first lens 310 can have positive refractive power. The object-side surface of the first lens 310 can be convex in the paraxial region, and the image-side surface of the first lens 310 can be concave in the paraxial region.

[0129] The second lens 320 may have negative refractive power. The object-side surface of the second lens 320 may be convex in the paraxial region, and the image-side surface of the second lens 320 may be concave in the paraxial region. The second lens 320 may be a high refractive index lens with a refractive index of 1.6 or higher.

[0130] The third lens 330 can have positive refractive power. The object-side surface of the third lens 330 can be convex in the paraxial region, and the image-side surface of the third lens 330 can be concave in the paraxial region.

[0131] The fourth lens 340 can have negative refractive power. The object-side and image-side surfaces of the fourth lens 340 can be concave in the paraxial region. The fourth lens 340 can be a high refractive index lens with a refractive index of 1.6 or higher.

[0132] The fifth lens 350 can have negative refractive power. The object-side surface of the fifth lens 350 can be convex in the paraxial region, and the image-side surface of the fifth lens 350 can be concave in the paraxial region. The fifth lens 350 can be a high refractive index lens with a refractive index of 1.6 or higher.

[0133] The sixth lens 360 can have positive refractive power. The object-side surface of the sixth lens 360 can be convex in the paraxial region, and the image-side surface of the sixth lens 360 can be concave in the paraxial region.

[0134] The seventh lens 370 can have positive refractive power. The object-side surface of the seventh lens 370 can be convex in the paraxial region, and the image-side surface of the seventh lens 370 can be concave in the paraxial region.

[0135] The eighth lens 380 can have negative refractive power. The object-side surface of the eighth lens 380 can be convex in the paraxial region, and the image-side surface of the eighth lens 380 can be concave in the paraxial region.

[0136] According to the third embodiment, the Abbe number of each of the first lens 310, the third lens 330, and the eighth lens 380 can be 50 or more. The Abbe number of each of the second lens 320 and the fourth lens 340 can be less than 20. The Abbe number of each of the fifth lens 350, the sixth lens 360, and the seventh lens 370 can be 20 or more and less than 40.

[0137] According to the third embodiment, the first lens 310 to the eighth lens 380 can be formed of a plastic material. Furthermore, the object-side surface and image-side surface of the first lens 310 to the eighth lens 380 can be aspherical.

[0138] Table 5 lists the characteristics of each lens included in the optical imaging system 300 according to the third embodiment, and Table 6 lists the aspherical coefficients of each lens included in the optical imaging system 300 according to the third embodiment.

[0139] Table 5:

[0140] Table 6:

[0141] Figure 4A This is a configuration diagram showing an optical imaging system according to a fourth embodiment. Figure 4B This is a graph showing the aberration characteristics of the optical imaging system according to the fourth embodiment.

[0142] The optical imaging system 400 according to the fourth embodiment may sequentially include a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, a sixth lens 460, a seventh lens 470, and an eighth lens 480 from the object side. The optical imaging system 400 according to the fourth embodiment may also include a filter F and an image sensor S having an imaging surface IP.

[0143] The first lens 410 can have positive refractive power. The object-side surface of the first lens 410 can be convex in the paraxial region, and the image-side surface of the first lens 410 can be concave in the paraxial region.

[0144] The second lens 420 may have negative refractive power. The object-side surface of the second lens 420 may be convex in the paraxial region, and the image-side surface of the second lens 420 may be concave in the paraxial region. The second lens 420 may be a high refractive index lens with a refractive index of 1.6 or higher.

[0145] The third lens 430 can have positive refractive power. The object-side surface of the third lens 430 can be convex in the paraxial region, and the image-side surface of the third lens 430 can be concave in the paraxial region.

[0146] The fourth lens 440 can have negative refractive power. The object-side surface of the fourth lens 440 can be convex in the paraxial region, and the image-side surface of the fourth lens 440 can be concave in the paraxial region. The fourth lens 440 can be a high refractive index lens with a refractive index of 1.6 or higher.

[0147] The fifth lens 450 can have negative refractive power. The object-side surface of the fifth lens 450 can be convex in the paraxial region, and the image-side surface of the fifth lens 450 can be concave in the paraxial region. The fifth lens 450 can be a high refractive index lens with a refractive index of 1.6 or higher.

[0148] The sixth lens 460 can have positive refractive power. The object-side surface of the sixth lens 460 can be convex in the paraxial region, and the image-side surface of the sixth lens 460 can be concave in the paraxial region.

[0149] The seventh lens 470 can have positive refractive power. The object-side surface of the seventh lens 470 can be convex in the paraxial region, and the image-side surface of the seventh lens 470 can be concave in the paraxial region.

[0150] The eighth lens 480 can have negative refractive power. The object-side and image-side surfaces of the eighth lens 480 can be concave in the paraxial region.

[0151] According to the fourth embodiment, the Abbe number of each of the first lens 410, the third lens 430, and the eighth lens 480 can be 50 or more. The Abbe number of each of the second lens 420 and the fourth lens 440 can be less than 20. The Abbe number of each of the fifth lens 450, the sixth lens 460, and the seventh lens 470 can be 20 or more and less than 40.

[0152] According to the fourth embodiment, the first lens 410 to the eighth lens 480 can be formed of a plastic material. Furthermore, the object-side surface and image-side surface of the first lens 410 to the eighth lens 480 can be aspherical.

[0153] Table 7 lists the characteristics of each lens included in the optical imaging system 400 according to the fourth embodiment, and Table 8 lists the aspherical coefficients of each lens included in the optical imaging system 400 according to the fourth embodiment.

[0154] Table 7:

[0155] Table 8:

[0156] Figure 5A This is a configuration diagram showing an optical imaging system according to a fifth embodiment. Figure 5B This is a graph showing the aberration characteristics of the optical imaging system according to the fifth embodiment.

[0157] The optical imaging system 500 according to the fifth embodiment may sequentially 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 from the object side. The optical imaging system 500 according to the fifth embodiment may also include a filter F and an image sensor S having an imaging surface IP.

[0158] The first lens 510 can have positive refractive power. The object-side surface of the first lens 510 can be convex in the paraxial region, and the image-side surface of the first lens 510 can be concave in the paraxial region.

[0159] The second lens 520 may have negative refractive power. The object-side surface of the second lens 520 may be convex in the paraxial region, and the image-side surface of the second lens 520 may be concave in the paraxial region. The second lens 520 may be a high refractive index lens with a refractive index of 1.6 or higher.

[0160] The third lens 530 can have positive refractive power. The object-side surface of the third lens 530 can be convex in the paraxial region, and the image-side surface of the third lens 530 can be concave in the paraxial region.

[0161] The fourth lens 540 can have negative refractive power. The object-side surface of the fourth lens 540 can be convex in the paraxial region, and the image-side surface of the fourth lens 540 can be concave in the paraxial region. The fourth lens 540 can be a high refractive index lens with a refractive index of 1.6 or higher.

[0162] The fifth lens 550 can have negative refractive power. The object-side surface of the fifth lens 550 can be convex in the paraxial region, and the image-side surface of the fifth lens 550 can be concave in the paraxial region. The fifth lens 550 can be a high refractive index lens with a refractive index of 1.6 or higher.

[0163] The sixth lens 560 can have positive refractive power. The object-side surface of the sixth lens 560 can be convex in the paraxial region, and the image-side surface of the sixth lens 560 can be concave in the paraxial region.

[0164] The seventh lens 570 can have positive refractive power. The object-side surface of the seventh lens 570 can be convex in the paraxial region, and the image-side surface of the seventh lens 570 can be concave in the paraxial region.

[0165] The eighth lens 580 can have negative refractive power. The object-side and image-side surfaces of the eighth lens 580 can be concave in the paraxial region.

[0166] According to the fifth embodiment, the Abbe number of each of the first lens 510, the third lens 530, and the eighth lens 580 can be 50 or more. The Abbe number of each of the second lens 520 and the fourth lens 540 can be less than 20. The Abbe number of each of the fifth lens 550, the sixth lens 560, and the seventh lens 570 can be 20 or more and less than 40.

[0167] According to the fifth embodiment, the first lens 510 to the eighth lens 580 can be formed of a plastic material. Furthermore, the object-side surface and image-side surface of the first lens 510 to the eighth lens 580 can be aspherical.

[0168] Table 9 lists the characteristics of each lens included in the optical imaging system 500 according to the fifth embodiment, and Table 10 lists the aspherical coefficients of each lens included in the optical imaging system 500 according to the fifth embodiment.

[0169] Table 9:

[0170] Table 10:

[0171] Figure 6A This is a configuration diagram showing an optical imaging system according to a sixth embodiment. Figure 6B This is a graph showing the aberration characteristics of the optical imaging system according to the sixth embodiment.

[0172] The optical imaging system 600 according to the sixth embodiment may sequentially 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 from the object side. The optical imaging system 600 according to the sixth embodiment may also include a filter F and an image sensor S having an imaging surface IP.

[0173] The first lens 610 can have positive refractive power. The object-side surface of the first lens 610 can be convex in the paraxial region, and the image-side surface of the first lens 610 can be concave in the paraxial region.

[0174] The second lens 620 can have negative refractive power. The object-side surface of the second lens 620 can be convex in the paraxial region, and the image-side surface of the second lens 620 can be concave in the paraxial region. The second lens 620 can be a high refractive index lens with a refractive index of 1.6 or higher.

[0175] The third lens 630 can have positive refractive power. The object-side surface of the third lens 630 can be convex in the paraxial region, and the image-side surface of the third lens 630 can be concave in the paraxial region.

[0176] The fourth lens 640 can have negative refractive power. The object-side surface of the fourth lens 640 can be convex in the paraxial region, and the image-side surface of the fourth lens 640 can be concave in the paraxial region. The fourth lens 640 can be a high refractive index lens with a refractive index of 1.6 or higher.

[0177] The fifth lens 650 can have negative refractive power. The object-side surface of the fifth lens 650 can be convex in the paraxial region, and the image-side surface of the fifth lens 650 can be concave in the paraxial region. The fifth lens 650 can be a high refractive index lens with a refractive index of 1.6 or higher.

[0178] The sixth lens 660 can have positive refractive power. The object-side surface of the sixth lens 660 can be convex in the paraxial region, and the image-side surface of the sixth lens 660 can be concave in the paraxial region.

[0179] The seventh lens 670 can have positive refractive power. The object-side surface of the seventh lens 670 can be convex in the paraxial region, and the image-side surface of the seventh lens 670 can be concave in the paraxial region.

[0180] The eighth lens 680 can have negative refractive power. The object-side and image-side surfaces of the eighth lens 680 can be concave in the paraxial region.

[0181] According to the sixth embodiment, the Abbe number of each of the first lens 610, the third lens 630, and the eighth lens 680 can be 50 or more. The Abbe number of each of the second lens 620 and the fourth lens 640 can be less than 20. The Abbe number of each of the fifth lens 650, the sixth lens 660, and the seventh lens 670 can be 20 or more and less than 40.

[0182] According to the sixth embodiment, the first lens 610 to the eighth lens 680 can be formed of a plastic material. Furthermore, the object-side surface and image-side surface of the first lens 610 to the eighth lens 680 can be aspherical.

[0183] Table 11 lists the characteristics of each lens included in the optical imaging system 600 according to the sixth embodiment, and Table 12 lists the aspherical coefficients of each lens included in the optical imaging system 600 according to the sixth embodiment.

[0184] Table 11:

[0185] Table 12:

[0186] Figure 7A This is a configuration diagram showing an optical imaging system according to the seventh embodiment. Figure 7B This is a graph showing the aberration characteristics of the optical imaging system according to the seventh embodiment.

[0187] The optical imaging system 700 according to the seventh embodiment may sequentially include a first lens 710, a second lens 720, a third lens 730, a fourth lens 740, a fifth lens 750, a sixth lens 760, a seventh lens 770, and an eighth lens 780 from the object side. The optical imaging system 700 according to the seventh embodiment may also include a filter F and an image sensor S having an imaging surface IP.

[0188] The first lens 710 can have positive refractive power. The object side of the first lens 710 can be convex in the paraxial region, and the image side of the first lens 710 can be concave in the paraxial region.

[0189] The second lens 720 can have negative refractive power. The object-side surface of the second lens 720 can be convex in the paraxial region, and the image-side surface of the second lens 720 can be concave in the paraxial region. The second lens 720 can be a high refractive index lens with a refractive index of 1.6 or higher.

[0190] The third lens 730 can have positive refractive power. The object-side surface of the third lens 730 can be convex in the paraxial region, and the image-side surface of the third lens 730 can be concave in the paraxial region.

[0191] The fourth lens 740 can have negative refractive power. The object-side surface of the fourth lens 740 can be convex in the paraxial region, and the image-side surface of the fourth lens 740 can be concave in the paraxial region. The fourth lens 740 can be a high refractive index lens with a refractive index of 1.6 or higher.

[0192] The fifth lens 750 can have negative refractive power. The object-side surface of the fifth lens 750 can be convex in the paraxial region, and the image-side surface of the fifth lens 750 can be concave in the paraxial region. The fifth lens 750 can be a high refractive index lens with a refractive index of 1.6 or higher.

[0193] The sixth lens 760 can have positive refractive power. The object-side surface of the sixth lens 760 can be convex in the paraxial region, and the image-side surface of the sixth lens 760 can be concave in the paraxial region.

[0194] The seventh lens 770 can have positive refractive power. The object-side surface of the seventh lens 770 can be convex in the paraxial region, and the image-side surface of the seventh lens 770 can be concave in the paraxial region.

[0195] The eighth lens 780 can have negative refractive power. The object-side and image-side surfaces of the eighth lens 780 can be concave in the paraxial region.

[0196] According to the seventh embodiment, the Abbe number of each of the first lens 710, the third lens 730, and the eighth lens 780 can be 50 or more. The Abbe number of each of the second lens 720 and the fourth lens 740 can be less than 20. The Abbe number of each of the fifth lens 750, the sixth lens 760, and the seventh lens 770 can be 20 or more and less than 40.

[0197] According to the seventh embodiment, the first lens 710 to the eighth lens 780 can be formed of a plastic material. Furthermore, the object-side surface and image-side surface of the first lens 710 to the eighth lens 780 can be aspherical.

[0198] Table 13 lists the characteristics of each lens included in the optical imaging system 700 according to the seventh embodiment, and Table 14 lists the aspherical coefficients of each lens included in the optical imaging system 700 according to the seventh embodiment.

[0199] Table 13:

[0200] Table 14:

[0201] Figure 8A This is a configuration diagram showing the optical imaging system according to the eighth embodiment. Figure 8B This is a graph showing the aberration characteristics of the optical imaging system according to the eighth embodiment.

[0202] The optical imaging system 800 according to the eighth embodiment may sequentially include a first lens 810, a second lens 820, a third lens 830, a fourth lens 840, a fifth lens 850, a sixth lens 860, a seventh lens 870, and an eighth lens 880 from the object side. The optical imaging system 800 according to the eighth embodiment may also include a filter F and an image sensor S having an imaging surface IP.

[0203] The first lens 810 can have positive refractive power. The object-side surface of the first lens 810 can be convex in the paraxial region, and the image-side surface of the first lens 810 can be concave in the paraxial region.

[0204] The second lens 820 can have negative refractive power. The object-side surface of the second lens 820 can be convex in the paraxial region, and the image-side surface of the second lens 820 can be concave in the paraxial region. The second lens 820 can be a high refractive index lens with a refractive index of 1.6 or higher.

[0205] The third lens 830 can have positive refractive power. The object-side surface of the third lens 830 can be convex in the paraxial region, and the image-side surface of the third lens 830 can be concave in the paraxial region.

[0206] The fourth lens 840 can have negative refractive power. The object-side surface of the fourth lens 840 can be convex in the paraxial region, and the image-side surface of the fourth lens 840 can be concave in the paraxial region. The fourth lens 840 can be a high refractive index lens with a refractive index of 1.6 or higher.

[0207] The fifth lens 850 can have negative refractive power. The object-side surface of the fifth lens 850 can be convex in the paraxial region, and the image-side surface of the fifth lens 850 can be concave in the paraxial region. The fifth lens 850 can be a high refractive index lens with a refractive index of 1.6 or higher.

[0208] The sixth lens 860 can have positive refractive power. The object-side surface of the sixth lens 860 can be convex in the paraxial region, and the image-side surface of the sixth lens 860 can be concave in the paraxial region.

[0209] The seventh lens 870 can have positive refractive power. The object-side surface of the seventh lens 870 can be convex in the paraxial region, and the image-side surface of the seventh lens 870 can be concave in the paraxial region.

[0210] The eighth lens 880 can have negative refractive power. The object-side and image-side surfaces of the eighth lens 880 can be concave in the paraxial region.

[0211] According to the eighth embodiment, the Abbe number of each of the first lens 810, the third lens 830, and the eighth lens 880 can be 50 or more. The Abbe number of each of the second lens 820 and the fourth lens 840 can be less than 20. The Abbe number of each of the fifth lens 850, the sixth lens 860, and the seventh lens 870 can be 20 or more and less than 40.

[0212] According to the eighth embodiment, the first lens 810 to the eighth lens 880 can be formed of a plastic material. Furthermore, the object-side surface and image-side surface of the first lens 810 to the eighth lens 880 can be aspherical.

[0213] Table 15 lists the characteristics of each lens included in the optical imaging system 800 according to the eighth embodiment, and Table 16 lists the aspherical coefficients of each lens included in the optical imaging system 800 according to the eighth embodiment.

[0214] Table 15:

[0215] Table 16:

[0216] Table 17 lists the optical and physical characteristics of the optical imaging system according to the embodiments, and Table 18 lists the values ​​of the conditional expressions according to the embodiments.

[0217] Table 17:

[0218] Table 18:

[0219] According to the above embodiments, a reduced thickness can be achieved, and high-quality images can be obtained.

[0220] While specific examples have been shown and described above, it will be apparent upon understanding this disclosure that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be understood in a descriptive sense only and not for limiting purposes. The description of features or aspects in each example should be considered applicable to similar features or aspects in other examples. Suitable results may still be achieved if the described techniques are performed in a different order, and / or if components in the described system, architecture, device, or circuit are combined in different ways and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of this disclosure is not limited by the specific embodiments but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in this disclosure.

Claims

1. An optical imaging system, including: A first lens with positive refractive power; A second lens with negative refractive power; A third lens with refractive power; A fourth lens with refractive power; A fifth lens with negative refractive power; A sixth lens with positive refractive power; A seventh lens with refractive power; as well as The eighth lens with negative refractive power The first lens to the eighth lens are arranged sequentially from the object side. The optical imaging system comprises a total of eight lenses with refractive power, and Among them, 0.8 < FNO×(OAL / IMH) ≤ 1.0, Wherein, FNO is the value representing the brightness of the optical imaging system, OAL is the distance on the optical axis from the object side of the first lens to the imaging surface, and IMH is the diagonal length of the imaging surface.

2. The optical imaging system according to claim 1, wherein, The third lens has positive refractive power, and the image-side surface of the third lens is concave.

3. The optical imaging system according to claim 1, wherein, The fourth lens has negative refractive power.

4. The optical imaging system according to claim 1, wherein, The fourth lens has a convex object side and a concave image side.

5. The optical imaging system according to claim 1, in, The seventh lens has positive refractive power, and Among them, 2 < f7 / f < 5, Where f7 is the focal length of the seventh lens, and f is the total focal length of the optical imaging system.

6. The optical imaging system according to claim 1, wherein, The eighth lens has a convex object-side surface.

7. The optical imaging system according to claim 1, wherein, The condition 0 < f1 / f < 1 is satisfied. Where f1 is the focal length of the first lens, and f is the total focal length of the optical imaging system.

8. The optical imaging system according to claim 1, wherein, Satisfy 15 < FOV×IMH / f < 18 , Wherein, FOV is the field of view of the optical imaging system, and f is the total focal length of the optical imaging system.

9. The optical imaging system according to claim 1, wherein, Satisfying 1.0 < OAL / f < 1.2, Where f is the total focal length of the optical imaging system.

10. The optical imaging system according to claim 1, wherein, The condition is satisfied that 10 < V1 - (V6 + V7) / 2 < 30. Wherein, 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.

11. An optical imaging system, including: The first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, and eighth lens are sequentially arranged at predetermined intervals from the object side. In this case, the Abbe number of each of the second and fourth lenses is less than 20. The optical imaging system comprises a total of eight lenses with refractive power, and Among them, satisfying 15 < FOV×IMH / f < 18 , Wherein, FOV is the field of view of the optical imaging system, and f is the total focal length of the optical imaging system.

12. The optical imaging system according to claim 11, further comprising: An aperture stop is positioned between the third lens and the fourth lens.

13. The optical imaging system according to claim 11, wherein, Each of the three lenses from the first lens to the eighth lens has a refractive index of 1.6 or higher.

14. The optical imaging system according to claim 11, wherein, The following conditions must be met: -3 < f2 / f < -1 and -20 < f5 / f < -5. Where f2 is the focal length of the second lens and f5 is the focal length of the fifth lens.

15. The optical imaging system according to claim 11, wherein, It satisfies 1 < f6 / f < 6 and -1.1 < f8 / f < 0. Where f6 is the focal length of the sixth lens and f8 is the focal length of the eighth lens.

16. The optical imaging system according to claim 11, wherein, The condition is satisfied that 30 < V1-V4 < 45. Wherein, V1 is the Abbe number of the first lens, and V4 is the Abbe number of the fourth lens.

Images