Optical image capturing system

Abstract

The optical image capturing system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens arranged in order from an object side, in which a compound focal length of the first lens and the second lens has a positive value, a compound focal length of the eighth lens and the ninth lens has a negative value, and a compound focal length of the ninth lens has a positive value. The eighth lens and the ninth lens are glued to each other, and wherein the optical imaging system satisfies the following conditional expressions: 0.05 lt; cT9 / CT8lt; cT9 is the thickness of the ninth lens on the optical axis, and CT8 is the thickness of the eighth lens on the optical axis.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0135644, filed on October 7, 2024, and Korean Patent Application No. 10-2024-0152808, filed on October 31, 2024, both filed with the Korean Intellectual Property Office. The entire disclosure of the aforementioned Korean patent applications is incorporated herein by reference for all purposes. Technical Field

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

[0004] Recent portable terminals are equipped with cameras that include optical imaging systems for video calling and image capture, which include multiple lenses.

[0005] Furthermore, as the functionality of cameras in portable devices gradually increases, the demand for high-resolution cameras used in portable devices is also growing.

[0006] In addition, as portable devices become smaller, their cameras also need to become thinner, thus requiring the development of an optical imaging system that is both slim and capable of achieving high resolution.

[0007] 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

[0008] 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.

[0009] 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, an eighth lens, and a ninth lens arranged sequentially from the object side, wherein the composite focal length of the first lens and the second lens has a positive value, the composite focal length of the eighth lens and the ninth lens has a negative value, the eighth lens and the ninth lens are cemented together, and wherein the optical imaging system satisfies the following conditional expression: 0.05 < CT9 / CT8 < 0.5, where CT9 is the thickness of the ninth lens on the optical axis, and CT8 is the thickness of the eighth lens on the optical axis.

[0010] The following conditional expression can be satisfied: 0 < |f8 / v8-f9 / v9| < 2, where f8 is the focal length of the eighth lens, v8 is the Abbe number of the eighth lens, f9 is the focal length of the ninth lens, and v9 is the Abbe number of the ninth lens.

[0011] The image-side surface of the eighth lens and the object-side surface of the ninth lens can be glued together, and the image-side surface of the eighth lens and the object-side surface of the ninth lens can each have a point of inflection.

[0012] The following conditional expression can be satisfied: 0.5 < ave(v8, v9) / v7 < 1.2, where ave(v8, v9) is the average of the Abbe number of the eighth lens and the ninth lens, and v7 is the Abbe number of the seventh lens.

[0013] The first lens and the second lens can be glued together.

[0014] The following conditional expression can be satisfied: 0 < |f1 / v1-f2 / v2| < 2, where f1 is the focal length of the first lens, v1 is the Abbe number of the first lens, f2 is the focal length of the second lens, and v2 is the Abbe number of the second lens.

[0015] The following conditional expression can be satisfied: 0.05 < CT1 / CT2 < 0.3, where CT1 is the thickness of the first lens on the optical axis and CT2 is the thickness of the second lens on the optical axis.

[0016] The following conditional expression can be satisfied: 1.7 < ave(v1, v2) / v3 < 2.1, where ave(v1, v2) is the average of the Abbe number of the first lens and the Abbe number of the second lens, and v3 is the Abbe number of the third lens.

[0017] The following conditional expression can be satisfied: 3 < f1 / f2 < 4.5, where f1 is the focal length of the first lens and f2 is the focal length of the second lens.

[0018] The following condition expression can be satisfied: 0.4 < TTL / (2×IMG HT) < 0.65, where TTL is the distance from the object side of the first lens to the imaging plane on the optical axis and IMG HT is half the diagonal length of the imaging plane.

[0019] The following conditional expression can be satisfied: 0.7 < f12 / f < 1, where f12 is the composite focal length of the first and second lenses, and f is the total focal length of the optical imaging system.

[0020] The following conditional expression can be satisfied: -3 < f3 / f < 0, where f3 is the focal length of the third lens and f is the total focal length of the optical imaging system.

[0021] The following conditional expression can be satisfied: 1.1 < f7 / f < 1.4, where f7 is the focal length of the seventh lens and f is the total focal length of the optical imaging system.

[0022] The following conditional expression can be satisfied: -1 < f89 / f < -0.5, where f89 is the composite focal length of the eighth and ninth lenses, and f is the total focal length of the optical imaging system.

[0023] The seventh lens can have positive refractive power, and the eighth and ninth lenses can each have negative refractive power.

[0024] The first and second lenses can each have positive refractive power, and the third lens can have negative refractive power.

[0025] In another general aspect, the optical imaging system includes a first lens having positive refractive power, a second lens having positive refractive power, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens having negative refractive power, and a ninth lens having negative refractive power arranged sequentially from the object side, wherein the first lens and the second lens are cemented together, and the eighth lens and the ninth lens are cemented together.

[0026] The image-side surface of the eighth lens and the object-side surface of the ninth lens can each have a point of inflection.

[0027] The following conditional expression can be satisfied: 0 < |f1 / v1-f2 / v2| < 2, where f1 is the focal length of the first lens, v1 is the Abbe number of the first lens, f2 is the focal length of the second lens, and v2 is the Abbe number of the second lens.

[0028] Other features and aspects will become apparent from the following detailed description and accompanying drawings. Attached Figure Description

[0029] Figure 1 This is a configuration diagram of an optical imaging system according to a first embodiment of the present disclosure.

[0030] Figure 2 It is shown Figure 1 The diagram shows the aberration characteristics of the optical imaging system.

[0031] Figure 3 This is a configuration diagram of an optical imaging system according to a second embodiment of the present disclosure.

[0032] Figure 4 It is shown Figure 3The diagram shows the aberration characteristics of the optical imaging system.

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

[0034] Figure 6 It is shown Figure 5 The diagram shows the aberration characteristics of the optical imaging system.

[0035] 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

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] One aspect of this disclosure is to provide an optical imaging system that achieves high resolution while being thinner.

[0048] In the lens configuration diagrams described below, the thickness, size, and shape of the lenses may be slightly exaggerated for ease of illustration. Specifically, the spherical or aspherical shapes shown in the lens configuration diagrams are shown as examples, but are not limited thereto.

[0049] An optical imaging system according to an embodiment of the present disclosure may include nine lenses.

[0050] The first lens refers to the lens closest to the object side, and the ninth lens refers to the lens closest to the imaging surface (or image sensor).

[0051] Furthermore, in this specification, the values ​​of the lens's radius of curvature, thickness, distance, focal length, etc., are all in millimeters (mm), and the field of view (FOV) is in degrees (°).

[0052] Furthermore, in the description of the shape of each lens, a configuration in which one surface is convex means that the paraxial region of that surface is convex, and a configuration in which one surface is concave means that the paraxial region of that surface is concave.

[0053] Therefore, even if one surface of a lens is described as having a convex shape, the edge portion of the lens can be concave. Similarly, even if one surface of a lens is described as having a concave shape, the edge portion of the lens can be convex.

[0054] Meanwhile, the paraxial region refers to a very narrow region close to the optical axis.

[0055] An imaging plane can refer to a virtual plane on which an optical imaging system focuses its light. Alternatively, an imaging plane can refer to the surface of an image sensor that receives light.

[0056] An optical imaging system according to an embodiment of the present disclosure may include at least nine lenses.

[0057] For example, an optical imaging system according to an embodiment of this disclosure may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens arranged sequentially from the object side. At least two of the first to ninth lenses may be cemented together. The other lenses may be spaced apart from each other by a predetermined distance along the optical axis.

[0058] The optical imaging system according to embodiments of the present disclosure may further include an image sensor for converting an incident image of an object into an electrical signal.

[0059] In addition, the optical imaging system may include an infrared filter (hereinafter referred to as the "filter") to block infrared light. The filter may be positioned between the ninth lens and the image sensor.

[0060] In addition, the optical imaging system may also include an aperture for controlling the amount of light.

[0061] The first to ninth lenses constituting the optical imaging system according to embodiments of the present disclosure may be formed of a plastic material.

[0062] Furthermore, at least one of the first to ninth lenses may have an aspherical surface. For example, each of the first to ninth lenses may have at least one aspherical surface.

[0063] In other words, at least one of the object-side surface and image-side surface of the first to ninth lenses can be aspherical. For example, both the object-side surface and image-side surface of the first to ninth lenses can be aspherical. In this case, the aspherical surface of the first to ninth lenses is represented by Equation 1: Equation 1:

[0064] In Equation 1, c is the curvature of the lens (the reciprocal of the radius of curvature), K is the quadratic constant, and Y represents the distance from a point on the aspherical surface of the lens to the optical axis. Furthermore, constants A to H, J, and L to P refer to the aspherical coefficients. Additionally, Z represents the distance along the optical axis between a point on the aspherical surface of the lens and the vertex of that aspherical surface.

[0065] An optical imaging system according to an embodiment of the present disclosure can satisfy at least one of the following conditional expressions.

[0066] In this embodiment, the optical imaging system can satisfy the conditional expression 0 < |f1 / v1-f2 / v2| < 2. In this case, f1 is the focal length of the first lens, v1 is the Abbe number of the first lens, f2 is the focal length of the second lens, and v2 is the Abbe number of the second lens. Therefore, chromatic aberration can be reduced.

[0067] In this embodiment, the optical imaging system can satisfy the conditional expression 0 < |f8 / v8 - f9 / v9| < 2. In this case, f8 is the focal length of the eighth lens, v8 is the Abbe number of the eighth lens, f9 is the focal length of the ninth lens, and v9 is the Abbe number of the ninth lens. Therefore, chromatic aberration can be reduced.

[0068] In this embodiment, the optical imaging system can satisfy the conditional expression 0.05 < CT1 / CT2 < 0.3. In this case, CT1 is the thickness of the first lens along the optical axis, and CT2 is the thickness of the second lens along the optical axis. Therefore, the optical imaging system can be miniaturized while improving image resolution.

[0069] In this embodiment, the optical imaging system can satisfy the conditional expression 0.05 < CT9 / CT8 < 0.5. In this case, CT9 is the thickness of the ninth lens on the optical axis, and CT8 is the thickness of the eighth lens on the optical axis. Therefore, the optical imaging system can be miniaturized while improving image resolution.

[0070] In this embodiment, the optical imaging system can satisfy the conditional expression 0.4 < TTL / (2×IMG HT) < 0.65. In this case, TTL is the distance along the optical axis from the object side of the first lens to the imaging plane, and IMG HT is half the diagonal length of the imaging plane. Therefore, the optical imaging system can be miniaturized while improving image resolution.

[0071] In this embodiment, the optical imaging system can satisfy the condition 1 < f / EPD < 3. In this case, f is the total focal length of the optical imaging system, and EPD is the diameter of the entrance pupil of the optical imaging system. Additionally, f / EPD can refer to the F-number of the optical imaging system. Therefore, image brightness and resolution can be improved.

[0072] In this embodiment, the optical imaging system can satisfy the conditional expression 0.7 < f12 / f < 1. In this case, f12 is the composite focal length of the first and second lenses. Therefore, the resolution can be improved by appropriately adjusting the refractive power of the first and second lenses.

[0073] In this embodiment, the optical imaging system can satisfy the conditional expression -3 < f3 / f < 0. In this case, f3 is the focal length of the third lens. Therefore, aberrations can be minimized by appropriately adjusting the refractive power of the third lens.

[0074] In this embodiment, the optical imaging system can satisfy the conditional expression 3.5 < |f4 / f| < 6. In this case, f4 is the focal length of the fourth lens. Therefore, aberrations can be minimized by appropriately adjusting the refractive power of the fourth lens.

[0075] In this embodiment, the optical imaging system can satisfy the conditional expression 3 < |f5 / f| < 7. In this case, f5 is the focal length of the fifth lens. Therefore, aberrations can be minimized by appropriately adjusting the refractive power of the fifth lens.

[0076] In this embodiment, the optical imaging system can satisfy the conditional expression 6 < |f6 / f| < 15. In this case, f6 is the focal length of the sixth lens. Therefore, aberrations can be minimized by appropriately adjusting the refractive power of the sixth lens.

[0077] In this embodiment, the optical imaging system can satisfy the conditional expression 1.1 < f7 / f < 1.4. In this case, f7 is the focal length of the seventh lens. Therefore, image resolution can be improved and field curvature can be reduced.

[0078] In this embodiment, the optical imaging system can satisfy the conditional expression -1 < f89 / f < -0.5. In this case, f89 is the composite focal length of the eighth and ninth lenses. Therefore, image resolution can be improved and field curvature can be reduced.

[0079] In this embodiment, the optical imaging system can satisfy the conditional expression 75° < FOV × (IMG HT / f) < 90°. In this case, FOV is the field of view of the optical imaging system.

[0080] In this embodiment, the optical imaging system can satisfy the conditional expression 1.7 < ave(v1, v2) / v3 < 2.1. In this case, ave(v1, v2) is the average of the Abbe numbers of the first and second lenses, and v3 is the Abbe number of the third lens. Therefore, chromatic aberration can be reduced.

[0081] In this embodiment, the optical imaging system can satisfy the conditional expression 0.5 < ave(v8, v9) / v7 < 1.2. In this case, ave(v8, v9) is the average of the Abbe numbers of the eighth and ninth lenses, and v7 is the Abbe number of the seventh lens. Therefore, chromatic aberration can be reduced.

[0082] In this embodiment, the optical imaging system can satisfy the conditional expression 3 < f1 / f2 < 4.5. Therefore, the resolution can be improved by appropriately adjusting the refractive power of the first and second lenses.

[0083] The first lens may have positive refractive power. Additionally, the first lens may have a meniscus shape that convexes towards the object side. For example, the object side of the first lens may be convex in the paraxial region, and the image side of the first lens may be concave in the paraxial region.

[0084] The second lens can have positive refractive power. Additionally, the second lens can have a meniscus shape that convexes towards the object side. For example, the second lens can have a convex object-side surface in the paraxial region, and the image-side surface of the second lens can be concave in the paraxial region.

[0085] The combined focal length of the first and second lenses can be positive.

[0086] The third lens can have negative refractive power. Additionally, the third lens can have a meniscus shape that convexes towards the object side. For example, the third lens can have a convex object-side surface in the paraxial region, and the image-side surface of the third lens can be concave in the paraxial region.

[0087] The fourth lens can have either positive or negative refractive power. Furthermore, the fourth lens can have a shape where both its surfaces are convex. For example, the object-side and image-side of the fourth lens can be convex in the paraxial region.

[0088] Alternatively, the fourth lens may have a meniscus shape that convexes toward the object side. For example, the object side of the fourth lens may be convex in the paraxial region, and the image side of the fourth lens may be concave in the paraxial region.

[0089] The fifth lens can have either positive or negative refractive power. Furthermore, the fifth lens can have a shape where both its surfaces are concave. For example, the object-side and image-side of the fifth lens can be concave in the paraxial region.

[0090] Alternatively, the fifth lens may have a shape in which both of its surfaces are convex. For example, the object-side and image-side of the fifth lens may be convex in the paraxial region.

[0091] Alternatively, the fifth lens may have a meniscus shape that convexes toward the image side. For example, the object side of the fifth lens may be concave in the paraxial region, and the image side of the fifth lens may be convex in the paraxial region.

[0092] The sixth lens can have positive or negative refractive power. Additionally, the sixth lens can have a meniscus shape that convexes towards the object side. For example, the object side of the sixth lens can be convex in the paraxial region, and the image side of the sixth lens can be concave in the paraxial region.

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

[0094] Furthermore, the seventh lens can have a shape where both of its surfaces are convex. For example, the object-side and image-side of the seventh lens can be convex in the paraxial region.

[0095] The eighth lens can have negative refractive power. Additionally, the eighth lens can have a meniscus shape that convexes towards the object side. For example, the object side of the eighth lens can be convex in the paraxial region, and the image side of the eighth lens can be concave in the paraxial region.

[0096] Alternatively, the eighth lens may have a shape in which both of its surfaces are concave. For example, the object-side and image-side of the eighth lens may be concave in the paraxial region.

[0097] The ninth lens can have negative refractive power. Additionally, the ninth lens can have a meniscus shape that convexes towards the object side. For example, the object side of the ninth lens can be convex in the paraxial region, and the image side of the ninth lens can be concave in the paraxial region.

[0098] The combined focal length of the eighth and ninth lenses can be negative.

[0099] One or more of the seventh to ninth lenses may have at least one inflection point formed on at least one of the object-side and image-side surfaces. For example, the object-side surface of the seventh lens may be convex in the paraxial region and concave in the portion other than the paraxial region.

[0100] At the same time, among the multiple lenses in an optical imaging system, at least two lenses can be cemented together.

[0101] In an embodiment, among the first to ninth lenses, the two lenses closest to the object side can be configured in a cemented configuration, and the two lenses closest to the image side can also be configured in a cemented configuration.

[0102] In this embodiment, the first lens and the second lens may be bonded together. For example, the image-side surface of the first lens and the object-side surface of the second lens may be in direct contact with each other. That is, no additional adhesive may be required between the image-side surface of the first lens and the object-side surface of the second lens.

[0103] In one embodiment, the bonding of the first lens and the second lens can be formed by applying a liquid polymer to the object side of the second lens and curing the liquid polymer (e.g., UV curing). Therefore, the cured polymer can be used as the first lens.

[0104] Compared to the second lens, the first lens can have a relatively thinner thickness. Therefore, the performance of an optical imaging system can be improved by adding more lenses without significantly changing the total trajectory length (TTL) of the optical imaging system.

[0105] In this embodiment, the eighth and ninth lenses can be bonded together. For example, the image-side surface of the eighth lens and the object-side surface of the ninth lens can be in direct contact with each other. That is, no additional adhesive is required between the image-side surface of the eighth lens and the object-side surface of the ninth lens.

[0106] In an embodiment, the bonding of the eighth and ninth lenses can be formed by applying a liquid polymer to the image-side surface of the eighth lens and curing the liquid polymer (e.g., UV curing). Therefore, the cured polymer can be used as the ninth lens.

[0107] Compared to the eighth lens, the ninth lens can have a relatively thinner thickness. Therefore, the performance of an optical imaging system can be improved by adding more lenses without significantly changing the total trajectory length (TTL) of the optical imaging system.

[0108] In this embodiment, the image-side surface of the eighth lens and the object-side surface of the ninth lens may each have a recurve point. That is, the recurve point may be located at the cemented surface where the eighth and ninth lenses are bonded together.

[0109] The optical imaging system can be configured to have a field of view greater than 80°. In an embodiment, the field of view of the optical imaging system can be less than 90°.

[0110] Reference Figure 1 and Figure 2 An optical imaging system 100 according to a first embodiment of the present disclosure is described.

[0111] The optical imaging system 100 according to the first embodiment of the present disclosure may include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, an eighth lens 180 and a ninth lens 190, and may also include a filter IF and an image sensor.

[0112] The optical imaging system 100 according to the first embodiment of this disclosure can form a focal point on the imaging surface IP.

[0113] Table 1 shows the lens characteristics of each lens (radius of curvature, lens thickness or distance between lenses, refractive index, and Abbe number).

[0114] Table 1

[0115] In the first embodiment of this disclosure, the first lens 110 may have positive refractive power, the object side of the first lens 110 may be convex in the paraxial region, and the image side of the first lens 110 may be concave in the paraxial region.

[0116] The second lens 120 can have positive refractive power, the object side of the second lens 120 can be convex in the paraxial region, and the image side of the second lens 120 can be concave in the paraxial region.

[0117] The first lens 110 and the second lens 120 can be cemented together. For example, the image-side surface of the first lens 110 and the object-side surface of the second lens 120 can be cemented together.

[0118] The first lens 110 and the second lens 120 can be glued together using an adhesive.

[0119] The third lens 130 can have negative 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.

[0120] The fourth lens 140 can have positive refractive power, and both the object side and the image side of the fourth lens 140 can be convex in the paraxial region.

[0121] The fifth lens 150 can have negative refractive power, and both the object side and the image side of the fifth lens 150 can be concave in the paraxial region.

[0122] The sixth lens 160 can have negative refractive power, the object side of the sixth lens 160 can be convex in the paraxial region, and the image side of the sixth lens 160 can be concave in the paraxial region.

[0123] The seventh lens 170 can have positive refractive power, the object side of the seventh lens 170 can be convex in the paraxial region, and the image side of the seventh lens 170 can be concave in the paraxial region.

[0124] The eighth lens 180 can have negative refractive power, the object side of the eighth lens 180 can be convex in the paraxial region, and the image side of the eighth lens 180 can be concave in the paraxial region.

[0125] The ninth lens 190 can have negative refractive power, the object side of the ninth lens 190 can be convex in the paraxial region, and the image side of the ninth lens 190 can be concave in the paraxial region.

[0126] The eighth lens 180 and the ninth lens 190 can be cemented together. For example, the image-side surface of the eighth lens 180 and the object-side surface of the ninth lens 190 can be cemented together.

[0127] The eighth lens 180 and the ninth lens 190 can be glued together using an adhesive.

[0128] One or more of the seventh lens 170 to the ninth lens 190 may have at least one inversion point on at least one surface of the object side and the image side.

[0129] Meanwhile, each surface of the first lens 110 to the ninth lens 190 may have an aspherical coefficient as shown in Table 2. For example, the object-side surface and the image-side surface of the first lens 110 to the ninth lens 190 may both be aspherical.

[0130] Table 2

[0131] Furthermore, the optical imaging system configured as described above can have, for example... Figure 2 The aberration characteristics shown are illustrated.

[0132] Reference Figure 3 and Figure 4 An optical imaging system 200 according to a second embodiment of the present disclosure is described.

[0133] The optical imaging system 200 according to the second embodiment of the present disclosure may include a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, a sixth lens 260, a seventh lens 270, an eighth lens 280 and a ninth lens 290, and may also include a filter IF and an image sensor.

[0134] The optical imaging system 200 according to the second embodiment of this disclosure can form a focal point on the imaging surface IP.

[0135] Table 3 shows the lens characteristics of each lens (radius of curvature, lens thickness or distance between lenses, refractive index, and Abbe number).

[0136] Table 3

[0137] In the second embodiment of this disclosure, the first lens 210 may have positive refractive power, the object side of the first lens 210 may be convex in the paraxial region, and the image side of the first lens 210 may be concave in the paraxial region.

[0138] The second lens 220 can have positive refractive power, the object side of the second lens 220 can be convex in the paraxial region, and the image side of the second lens 220 can be concave in the paraxial region.

[0139] The first lens 210 and the second lens 220 can be cemented together. For example, the image-side surface of the first lens 210 and the object-side surface of the second lens 220 can be cemented together.

[0140] The first lens 210 and the second lens 220 can be glued together using an adhesive.

[0141] The third lens 230 can have negative refractive power. The object side of the third lens 230 can be convex in the paraxial region, and the image side of the third lens 230 can be concave in the paraxial region.

[0142] The fourth lens 240 can have negative refractive power, the object side of the fourth lens 240 can be convex in the paraxial region, and the image side of the fourth lens 240 can be concave in the paraxial region.

[0143] The fifth lens 250 can have positive refractive power, and both the object side and the image side of the fifth lens 250 can be convex in the paraxial region.

[0144] The sixth lens 260 can have positive refractive power, the object side of the sixth lens 260 can be convex in the paraxial region, and the image side of the sixth lens 260 can be concave in the paraxial region.

[0145] The seventh lens 270 can have positive refractive power, and both the object side and the image side of the seventh lens 270 can be convex in the paraxial region.

[0146] The eighth lens 280 can have negative refractive power, and both the object side and the image side of the eighth lens 280 can be concave in the paraxial region.

[0147] The ninth lens 290 can have negative refractive power, the object side of the ninth lens 290 can be convex in the paraxial region, and the image side of the ninth lens 290 can be concave in the paraxial region.

[0148] The eighth lens 280 and the ninth lens 290 can be cemented together. For example, the image-side surface of the eighth lens 280 and the object-side surface of the ninth lens 290 can be cemented together.

[0149] The eighth lens 280 and the ninth lens 290 can be glued together using an adhesive.

[0150] One or more of the seventh lens 270 to the ninth lens 290 may have at least one inversion point on at least one surface of the object side and the image side.

[0151] Meanwhile, each surface of the first lens 210 to the ninth lens 290 can have an aspherical coefficient as shown in Table 4. For example, the object-side surface and the image-side surface of the first lens 210 to the ninth lens 290 can both be aspherical.

[0152] Table 4

[0153] Furthermore, the optical imaging system configured as described above can have, for example... Figure 4 The aberration characteristics shown.

[0154] Reference Figure 5 and Figure 6 An optical imaging system 300 according to a third embodiment of the present disclosure is described.

[0155] The optical imaging system 300 according to the third embodiment of the present disclosure may include a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, a sixth lens 360, a seventh lens 370, an eighth lens 380 and a ninth lens 390, and may also include a filter IF and an image sensor.

[0156] The optical imaging system 300 according to the third embodiment of this disclosure can form a focal point on the imaging surface IP.

[0157] Table 5 shows the lens characteristics (radius of curvature, lens thickness or distance between lenses, refractive index, and Abbe number) for each lens.

[0158] Table 5

[0159] In the third embodiment of this disclosure, the first lens 310 may have positive refractive power, the object side of the first lens 310 may be convex in the paraxial region, and the image side of the first lens 310 may be concave in the paraxial region.

[0160] The second lens 320 can have positive refractive power, the object side of the second lens 320 can be convex in the paraxial region, and the image side of the second lens 320 can be concave in the paraxial region.

[0161] The first lens 310 and the second lens 320 can be cemented together. For example, the image-side surface of the first lens 310 and the object-side surface of the second lens 320 can be cemented together.

[0162] The first lens 310 and the second lens 320 can be glued together using an adhesive.

[0163] The third lens 330 can have negative refractive power, the object side of the third lens 330 can be convex in the paraxial region, and the image side of the third lens 330 can be concave in the paraxial region.

[0164] The fourth lens 340 can have positive refractive power, and both the object side and the image side of the fourth lens 340 can be convex in the paraxial region.

[0165] The fifth lens 350 can have negative refractive power. The object side of the fifth lens 350 can be concave in the paraxial region, and the image side of the fifth lens 350 can be convex in the paraxial region.

[0166] The sixth lens 360 can have negative refractive power. The object side of the sixth lens 360 can be convex in the paraxial region, and the image side of the sixth lens 360 can be concave in the paraxial region.

[0167] The seventh lens 370 can have positive refractive power, the object side of the seventh lens 370 can be convex in the paraxial region, and the image side of the seventh lens 370 can be concave in the paraxial region.

[0168] The eighth lens 380 can have negative refractive power. The object side of the eighth lens 380 can be convex in the paraxial region, and the image side of the eighth lens 380 can be concave in the paraxial region.

[0169] The ninth lens 390 can have negative refractive power, the object side of the ninth lens 390 can be convex in the paraxial region, and the image side of the ninth lens 390 can be concave in the paraxial region.

[0170] The eighth lens 380 and the ninth lens 390 can be cemented together. For example, the image-side surface of the eighth lens 380 and the object-side surface of the ninth lens 390 can be cemented together.

[0171] The eighth lens 380 and the ninth lens 390 can be glued together using an adhesive.

[0172] One or more of the seventh lens 370 to the ninth lens 390 may have at least one inversion point on at least one surface of the object side and the image side.

[0173] Meanwhile, each surface of the first lens 310 to the ninth lens 390 may have an aspherical coefficient as shown in Table 6. For example, the object-side surface and the image-side surface of the first lens 310 to the ninth lens 390 may both be aspherical.

[0174] Table 6

[0175] Furthermore, the optical imaging system configured as described above can have, for example... Figure 6 The aberration characteristics shown are illustrated.

[0176] Table 7

[0177] In Table 7, 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, f8 is the focal length of the eighth lens, and f9 is the focal length of the ninth lens. Furthermore, f12 is the combined focal length of the first and second lenses, and f89 is the combined focal length of the eighth and ninth lenses.

[0178] In the optical imaging system according to embodiments of the present disclosure, high resolution can be achieved while reducing size.

[0179] 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: The first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, and ninth lens are arranged sequentially from the object side. The combined focal length of the first lens and the second lens has a positive value. The combined focal length of the eighth lens and the ninth lens has a negative value. The eighth lens and the ninth lens are glued together. The optical imaging system satisfies the following conditional expression: 0.05 < CT9 / CT8 < 0.5 Wherein, CT9 is the thickness of the ninth lens on the optical axis, and CT8 is the thickness of the eighth lens on the optical axis, and The optical imaging system has a total of nine lenses.

2. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: 0 < |f8 / v8-f9 / v9| < 2, Where f8 is the focal length of the eighth lens, v8 is the Abbe number of the eighth lens, f9 is the focal length of the ninth lens, and v9 is the Abbe number of the ninth lens.

3. The optical imaging system according to claim 1, wherein, The image-side surface of the eighth lens and the object-side surface of the ninth lens are glued together, and The image-side surface of the eighth lens and the object-side surface of the ninth lens each have a recurve point.

4. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: 0.5 < ave(v8, v9) / v7 < 1.2, Where ave(v8, v9) is the average of the Abbe number of the eighth lens and the Abbe number of the ninth lens, and v7 is the Abbe number of the seventh lens.

5. The optical imaging system according to claim 1, wherein, The first lens and the second lens are glued together.

6. The optical imaging system according to claim 5, wherein, The following conditional expression is satisfied: 0 < |f1 / v1-f2 / v2| < 2, Where f1 is the focal length of the first lens, v1 is the Abbe number of the first lens, f2 is the focal length of the second lens, and v2 is the Abbe number of the second lens.

7. The optical imaging system according to claim 5, wherein, The following conditional expression is satisfied: 0.05 < CT1 / CT2 < 0.3 Wherein, CT1 is the thickness of the first lens on the optical axis, and CT2 is the thickness of the second lens on the optical axis.

8. The optical imaging system according to claim 5, wherein, The following conditional expression is satisfied: 1.7 < ave(v1, v2) / v3 < 2.1 Where ave(v1, v2) is the average of the Abbe number of the first lens and the Abbe number of the second lens, and v3 is the Abbe number of the third lens.

9. The optical imaging system according to claim 5, wherein, The following conditional expression is satisfied: 3 < f1 / f2 < 4.5, Where f1 is the focal length of the first lens and f2 is the focal length of the second lens.

10. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: 0.4 < TTL / (2×IMG HT) < 0.65, Wherein, TTL is the distance from the object side of the first lens to the imaging surface on the optical axis, and IMG HT is half the diagonal length of the imaging surface.

11. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: 0.7 < f12 / f < 1, Wherein, f12 is the composite focal length of the first lens and the second lens, and f is the total focal length of the optical imaging system.

12. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: -3 < f3 / f < 0, Where f3 is the focal length of the third lens, and f is the total focal length of the optical imaging system.

13. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: 1.1 < f7 / f < 1.4, Where f7 is the focal length of the seventh lens, and f is the total focal length of the optical imaging system.

14. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: -1 < f89 / f < -0.5, Wherein, f89 is the composite focal length of the eighth lens and the ninth lens, and f is the total focal length of the optical imaging system.

15. The optical imaging system according to claim 1, wherein, The seventh lens has positive refractive power, and the eighth and ninth lenses each have negative refractive power.

16. The optical imaging system according to claim 1, wherein, The first lens and the second lens each have positive refractive power, and The third lens has negative refractive power.

17. An optical imaging system, comprising: The lenses arranged sequentially from the object side are: a first lens with positive refractive power, a second lens with positive refractive power, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens with negative refractive power, and a ninth lens with negative refractive power. The first lens and the second lens are glued together. The eighth lens and the ninth lens are glued together, and The optical imaging system has a total of nine lenses.

18. The optical imaging system according to claim 17, wherein, The image-side surface of the eighth lens and the object-side surface of the ninth lens each have a point of inflection.

19. The optical imaging system according to claim 17, wherein, The following conditional expression is satisfied: 0 < |f1 / v1-f2 / v2| < 2, Where f1 is the focal length of the first lens, v1 is the Abbe number of the first lens, f2 is the focal length of the second lens, and v2 is the Abbe number of the second lens.

Images