Optical image capturing system

Abstract

The present disclosure relates to an optical imaging system including a first cemented lens, a second cemented lens, and a third cemented lens disposed in order from an object side of the optical imaging system toward an imaging plane along an optical axis of the optical imaging system and spaced apart from each other by a predetermined distance, each of the first cemented lens, the second cemented lens, and the third cemented lens includes: a center lens made of a plastic material or a glass material; a first side lens bonded to an object side surface of the center lens, having refractive power, and made of a material different from a material from which the center lens is manufactured; and a second side lens bonded to the image side surface of the center lens, having refractive power, and made of a material different from the material from which the center lens is manufactured.

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0149391, filed on October 29, 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] Modern portable terminals are typically 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 particular, image sensors with high pixel counts (e.g., 13 to 200 million pixels) have recently been used in cameras for portable devices to achieve clearer image quality.

[0007] Furthermore, as portable devices become smaller, cameras used in portable devices also need to be thinner, thus requiring the development of thin optical imaging systems that can also achieve high resolution. 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, an optical imaging system includes a first adhesive lens, a second adhesive lens, and a third adhesive lens arranged sequentially along the optical axis of the optical imaging system from the object side of the optical imaging system toward the imaging surface of the optical imaging system and spaced apart from each other by a predetermined distance along the optical axis, wherein each of the first adhesive lens, the second adhesive lens, and the third adhesive lens includes: a central lens made of a plastic material or a glass material; a first side lens bonded to the object side of the central lens, having refractive power and made of a material different from the material used to manufacture the central lens; and a second side lens bonded to the image side of the central lens, having refractive power and made of a material different from the material used to manufacture the central lens.

[0010] The first bonded lens can have positive refractive power, the second bonded lens can have negative refractive power, and the third bonded lens can have negative refractive power.

[0011] The first bonding lens may include a first lens, a second lens, and a third lens arranged sequentially along the optical axis from the object side of the first bonding lens toward the imaging surface. The second bonding lens may include a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object side of the second bonding lens toward the imaging surface. The third bonding lens may include a seventh lens, an eighth lens, and a ninth lens arranged sequentially along the optical axis from the object side of the third bonding lens toward the imaging surface. The second lens, the fifth lens, and the eighth lens may be the center lenses of the first bonding lens, the second bonding lens, and the third bonding lens, respectively.

[0012] The first lens can have negative refractive power, and the second lens can have positive refractive power.

[0013] The first lens can have negative refractive power, the second lens can have positive refractive power, and the fifth lens can have negative refractive power.

[0014] The fifth lens may have negative refractive power, and one of the fourth and sixth lenses may have positive refractive power, while the other of the fourth and sixth lenses may have negative refractive power.

[0015] One of the seventh and eighth lenses can have positive refractive power, and the other of the seventh and eighth lenses can have negative refractive power.

[0016] The conditional expression 0 < (CTn-1+CTn+1) / CTn < 1 (n = 2, 5, 8) can be satisfied, where CTn-1 is the thickness of the (n-1)th lens along the optical axis, CTn is the thickness of the nth lens along the optical axis, and CTn+1 is the thickness of the (n+1)th lens along the optical axis.

[0017] It can satisfy the conditions 0 ≤ |f1 / v1-f2 / v2| < 4 and 0 ≤ |f2 / v2-f3 / v3| < 4, where 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, v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, and v3 is the Abbe number of the third lens.

[0018] The conditional expression 0.6 < TTL / (2×IMG HT) < 1.0 can be satisfied, where 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.

[0019] Among the refractive indices of the first to the ninth lenses, the fifth lens can have the largest refractive index.

[0020] The second, fifth, and eighth lenses can each be made of plastic material, and the plastic material used to manufacture the fifth lens can have optical properties different from those of the plastic material used to manufacture the second and eighth lenses.

[0021] Each of the first to ninth lenses can have an aspherical object side and an aspherical image side.

[0022] The second, fifth, and eighth lenses can each be made of glass materials with different optical properties.

[0023] One or both of the object-side and image-side surfaces of each of the first, second, and third lenses may be spherical surfaces.

[0024] The first lens may have an aspherical object side and a spherical image side, the second lens may have a spherical object side and a spherical image side, the third lens may have a spherical object side and an aspherical image side, and the fourth to ninth lenses may each have an aspherical object side and an aspherical image side.

[0025] The first lens, the second lens, the third lens, the seventh lens, the eighth lens, and the ninth lens may each have a convex object-side surface in their paraxial region, and the fourth lens may have a concave object-side surface in its paraxial region.

[0026] The first lens, the second lens, the third lens, the seventh lens, and the eighth lens may each have a concave image-side surface in their paraxial region, and the sixth lens may have a convex image-side surface in its paraxial region.

[0027] The object-side surface and image-side surface of each of the first, second, and third adhesive lenses can be aspherical surfaces.

[0028] The conditional expression 1.5 < f / EPD < 2.5 can be satisfied, where 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.

[0029] Other features and aspects will become apparent from the following detailed description and accompanying drawings. Attached Figure Description

[0030] Figure 1A This is a configuration diagram of an optical imaging system according to a first embodiment of the present disclosure.

[0031] Figure 1B It is shown Figure 1AThe diagram shows the aberration characteristics of the optical imaging system.

[0032] Figure 2A This is a configuration diagram of an optical imaging system according to a second embodiment of the present disclosure.

[0033] Figure 2B It is shown Figure 2A The diagram shows the aberration characteristics of the optical imaging system.

[0034] Figure 3A This is a configuration diagram of an optical imaging system according to a third embodiment of the present disclosure.

[0035] Figure 3B It is shown Figure 3A The diagram shows the aberration characteristics of the optical imaging system.

[0036] Throughout the accompanying drawings and detailed embodiments, 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

[0037] The following detailed embodiments are provided to help the reader gain 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 the disclosure of this application. 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 the disclosure of this application. Furthermore, for clarity and conciseness, descriptions of features well-known in the art may be omitted.

[0038] The features described herein may be implemented in various 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 the disclosure of this application.

[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.

[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] In the optical imaging system configuration diagrams in the accompanying drawings, the thickness, size, and shape of the lenses may be slightly exaggerated for clarity of explanation, and in particular, the spherical or aspherical shapes of the lenses shown in the optical imaging system configuration diagrams are merely examples and are not limited thereto.

[0045] In this specification, the first lens refers to the lens closest to the object side of the optical imaging system, and the ninth lens refers to the lens closest to the imaging surface (or image sensor) of the optical imaging system.

[0046] Furthermore, in this specification, the radius of curvature of the surface of the lens or other element, the thickness of the lens or other element, the distance between the lenses or other elements, the focal length of the lens, and other dimensions are expressed in millimeters (mm), and the field of view (FOV) is expressed in degrees (°).

[0047] Furthermore, in the description of lens shape, stating that the surface of the lens is convex means that the paraxial region of the surface is convex, and stating that the surface of the lens is concave means that the paraxial region of the surface is concave.

[0048] Therefore, even when the surface of the reflecting lens is convex, the edge portion of that surface can be concave. Similarly, even when the surface of the reflecting lens is concave, the edge portion of that surface can be convex.

[0049] The paraxial region of a lens surface is a very narrow area on the lens surface that is close to the optical axis.

[0050] More specifically, the paraxial region of the lens surface is the central portion of the lens surface surrounding and including the optical axis of the lens surface, in which light rays incident on the lens surface form a small angle θ with the optical axis, and the approximations sin θ ≈ θ, tan θ ≈ θ and cos θ ≈ 1 are valid.

[0051] An optical imaging system according to an embodiment of the present disclosure may include nine lenses.

[0052] For example, an optical imaging system according to an embodiment of the present 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 along the optical axis of the optical imaging system from the object side of the optical imaging system toward the imaging surface of the optical imaging system.

[0053] However, the optical imaging system according to embodiments of this disclosure may consist of more than nine lenses and may further include other components as needed. For example, the optical imaging system may also include an image sensor for converting incident light from an object into an electrical signal. Furthermore, the optical imaging system may include an infrared blocking filter (hereinafter referred to as a filter) for blocking light in the infrared region from incident onto the image sensor. Additionally, the optical imaging system may include an aperture for controlling the amount of light passing through the optical imaging system.

[0054] The first, third, fourth, sixth, seventh, and ninth lenses of the optical imaging system according to embodiments of the present disclosure can be made of polymer materials (materials different from the plastic materials mentioned below) and, for example, can have adhesive properties. For example, the first, third, fourth, sixth, seventh, and ninth lenses can be made of liquid ultraviolet (UV) polymer materials, which have the property of curing in response to UV light. Additionally, the second, fifth, and eighth lenses of the optical imaging system according to embodiments of the present disclosure can be made of plastic or glass materials.

[0055] Furthermore, at least one of the first to ninth lenses may have an aspherical surface as defined by Equation 1 below.

[0056] Equation 1:

[0057] In Equation 1, c is the curvature of the lens surface, and is equal to the reciprocal of the radius of curvature of the lens surface at the optical axis. 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 surface coefficients. Z (also called sag) is the distance between a point on the aspherical surface of the lens at a distance Y from the optical axis and a tangent plane perpendicular to the optical axis and intersecting the vertex of the aspherical surface, in a direction parallel to the optical axis.

[0058] The optical imaging system according to embodiments of the present disclosure can satisfy any one or any combination of any two or more of the following conditional expressions.

[0059] 0 ≤ |f1 / v1-f2 / v2| < 4 (Conditional expression 1)

[0060] 0 ≤ |f2 / v2-f3 / v3| < 4 (Conditional expression 2)

[0061] 0 < (CTn-1+CTn+1) / CTn < 1 (n = 2, 5, 8) (Conditional expression 3)

[0062] 0.6 < TTL / (2×IMGHT) < 1.0 (Conditional expression 4)

[0063] 1.5 < f / EPD < 2.5 (Conditional expression 5)

[0064] 1 < TTL / f < 1.3 (Conditional expression 6)

[0065] 0.1 < BFL / f < 0.2 (Conditional expression 7)

[0066] In these conditional expressions, 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, and f3 is the focal length of the third lens.

[0067] In addition, v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, and v3 is the Abbe number of the third lens.

[0068] Furthermore, CTn-1 is the thickness of the (n-1)th lens along the optical axis, CTn is the thickness of the nth lens along the optical axis, and CTn+1 is the thickness of the (n+1)th lens along the optical axis.

[0069] In addition, TTL is the distance along the optical axis from the object side of the first lens to the imaging plane, BFL is the distance along the optical axis from the image side of the ninth lens to the imaging plane, IMGHT is half the diagonal length of the imaging plane, and EPD is the diameter of the entrance pupil of the optical imaging system.

[0070] An optical imaging system according to an embodiment of the present disclosure may include three adhesive lenses. For example, an optical imaging system according to an embodiment of the present disclosure may include a first adhesive lens, a second adhesive lens, and a third adhesive lens arranged sequentially along the optical axis of the optical imaging system from the object side of the optical imaging system toward the imaging surface of the optical imaging system and spaced apart from each other by a predetermined distance along the optical axis.

[0071] According to embodiments of this disclosure, the first to third adhesive lenses may include lenses attached to each of the two surfaces (object-side and image-side) of the central lens. For example, the first adhesive lens may include a second lens serving as the central lens, a first lens attached to the object-side of the second lens, and a third lens attached to the image-side of the second lens. The second adhesive lens may include a fifth lens serving as the central lens, a fourth lens attached to the object-side of the fifth lens, and a sixth lens attached to the image-side of the fifth lens. The third adhesive lens may include an eighth lens serving as the central lens, a seventh lens attached to the object-side of the eighth lens, and a ninth lens attached to the image-side of the eighth lens.

[0072] According to embodiments of this disclosure, the first, third, fourth, sixth, seventh, and ninth lenses attached to the object-side or image-side of the central lens can be made of a polymer material with adhesive properties (a material different from the plastic material mentioned below), so that they can be directly attached to the object-side or image-side of the central lens without the use of additional adhesives.

[0073] According to embodiments of this disclosure, the second, fifth, and eighth lenses, which serve as the central lens, can be made of plastic or glass materials.

[0074] Figure 1A This is a configuration diagram of an optical imaging system according to a first embodiment of the present disclosure, and Figure 1B It is shown Figure 1A The diagram shows the aberration characteristics of the optical imaging system.

[0075] Reference Figure 1A 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 arranged sequentially along the optical axis of the optical imaging system 100 from the object side of the optical imaging system 100; a filter F; and an image sensor IS having an imaging surface IP, wherein the focal point is formed on the imaging surface IP.

[0076] According to the first embodiment of this disclosure, the optical imaging system 100 has a total focal length f of 8.91 mm, an IMG HT of 6.00 mm, and a FOV of 66.2°.

[0077] The characteristics of each element of the optical imaging system 100 according to the first embodiment of this disclosure are listed in Table 1 below.

[0078] Table 1

[0079] According to a first embodiment of this disclosure, the first lens 110 may have negative refractive power, its object-side surface may be convex, and its image-side surface may be concave. The second lens 120 may have positive refractive power, its object-side surface may be convex, and its image-side surface may be concave. The third lens 130 may have negative refractive power, its object-side surface may be convex, and its image-side surface may be concave. The fourth lens 140 may have negative refractive power, and both its object-side surface and image-side surface may be concave. The fifth lens 150 may have negative refractive power, its object-side surface may be convex, and its image-side surface may be concave. The sixth lens 160 may have positive refractive power, and both its object-side surface and image-side surface may be convex. The seventh lens 170 may have positive refractive power, its object-side surface may be convex, and its image-side surface may be concave. The eighth lens 180 may have negative refractive power, its object-side surface may be convex, and its image-side surface may be concave. The ninth lens 190 may have positive refractive power, its object-side surface may be convex, and its image-side surface may be concave.

[0080] According to a first embodiment of this disclosure, the first lens 110, the second lens 120, and the third lens 130 can form a first adhesive lens CL1, the fourth lens 140, the fifth lens 150, and the sixth lens 160 can form a second adhesive lens CL2, and the seventh lens 170, the eighth lens 180, and the ninth lens 190 can form a third adhesive lens CL3.

[0081] The first bonded lens CL1 can have positive refractive power, the second bonded lens CL2 can have negative refractive power, and the third bonded lens CL3 can have negative refractive power. The focal length of the first bonded lens CL1 is 8.84 mm (f123), the focal length of the second bonded lens CL2 is -5.77 mm (f456), and the focal length of the third bonded lens CL3 is -47.41 mm (f789).

[0082] The object-side surface of the first bonding lens CL1 can be convex, and its image-side surface can be concave. The object-side surface of the second bonding lens CL2 can be concave, and its image-side surface can be convex. The object-side surface of the third bonding lens CL3 can be convex, and its image-side surface can be concave.

[0083] According to a first embodiment of this disclosure, the first lens 110, the third lens 130, the fourth lens 140, the sixth lens 160, the seventh lens 170, and the ninth lens 190 may be made of polymer material, and the second lens 120, the fifth lens 150, and the eighth lens 180 may be made of plastic material.

[0084] At least one of the second lens 120, the fifth lens 150, and the eighth lens 180 may be made of a plastic material having optical properties different from those of the plastic materials used to manufacture the other lenses. For example, the fifth lens 150 may be made of a plastic material having optical properties different from those of the plastic materials used to manufacture the second lens 120 and the eighth lens 180. Furthermore, the optical properties of the plastic material used to manufacture the second lens 120 may differ from those of the plastic material used to manufacture the eighth lens 180.

[0085] The fifth lens 150 may be a high refractive index lens with a refractive index of 1.6 or greater, and among the first lens 110 to the ninth lens 190, the refractive index of the fifth lens 150 may be the largest.

[0086] Among the first lens 110, second lens 120, and third lens 130 that form the first bonding lens CL1, the refractive index of the second lens 120 can be the smallest. Among the fourth lens 140, fifth lens 150, and sixth lens 160 that form the second bonding lens CL2, the refractive index of the fifth lens 150 can be the largest. Among the seventh lens 170, eighth lens 180, and ninth lens 190 that form the third bonding lens CL3, the refractive index of the eighth lens 180 can be the smallest.

[0087] The aspherical coefficients of each lens in the optical imaging system 100 according to the first embodiment of this disclosure are listed in Table 2 below. According to the first embodiment of this disclosure, the first lens 110 to the ninth lens 190 may have aspherical surfaces on both surfaces (object side and image side), and the first bonding lens CL1, the second bonding lens CL2 and the third bonding lens CL3 may also have aspherical surfaces on both surfaces (object side and image side).

[0088] Table 2

[0089] Figure 2A This is a configuration diagram of an optical imaging system according to a second embodiment of the present disclosure, and Figure 2B It is shown Figure 2A The diagram shows the aberration characteristics of the optical imaging system.

[0090] Reference Figure 2AThe 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 arranged sequentially along the optical axis of the optical imaging system 200 from the object side of the optical imaging system 200; a filter F; and an image sensor IS having an imaging surface IP, on which the focal point is formed.

[0091] According to the second embodiment of this disclosure, the optical imaging system 200 has a total focal length f of 8.97 mm, an IMG HT of 6.00 mm, and a FOV of 65.8°.

[0092] The characteristics of each element of the optical imaging system 200 according to the second embodiment of the present disclosure are listed in Table 3 below.

[0093] Table 3

[0094] According to a second embodiment of this disclosure, the first lens 210 may have negative refractive power, with a convex object-side surface and a concave image-side surface. The second lens 220 may have positive refractive power, with a convex object-side surface and a concave image-side surface. The third lens 230 may have negative refractive power, with a convex object-side surface and a concave image-side surface. The fourth lens 240 may have positive refractive power, with a concave object-side surface and a convex image-side surface. The fifth lens 250 may have negative refractive power, with a concave object-side surface and a convex image-side surface. The sixth lens 260 may have negative refractive power, with a concave object-side surface and a convex image-side surface. The seventh lens 270 may have negative refractive power, with a convex object-side surface and a concave image-side surface. The eighth lens 280 may have positive refractive power, with a convex object-side surface and a concave image-side surface. The ninth lens 290 can have positive refractive power, the object side can be convex, and the image side can be concave.

[0095] According to a second embodiment of this disclosure, the first lens 210, the second lens 220, and the third lens 230 can form a first adhesive lens CL1, the fourth lens 240, the fifth lens 250, and the sixth lens 260 can form a second adhesive lens CL2, and the seventh lens 270, the eighth lens 280, and the ninth lens 290 can form a third adhesive lens CL3.

[0096] The first bonded lens CL1 can have positive refractive power, the second bonded lens CL2 can have negative refractive power, and the third bonded lens CL3 can have negative refractive power. The focal length of the first bonded lens CL1 is 9.10 mm (f123), the focal length of the second bonded lens CL2 is -151.10 mm (f456), and the focal length of the third bonded lens CL3 is -30.37 mm (f789).

[0097] The object-side surface of the first bonding lens CL1 can be convex, and its image-side surface can be concave. The object-side surface of the second bonding lens CL2 can be concave, and its image-side surface can be convex. The object-side surface of the third bonding lens CL3 can be convex, and its image-side surface can be concave.

[0098] According to a second embodiment of this disclosure, the first lens 210, the third lens 230, the fourth lens 240, the sixth lens 260, the seventh lens 270, and the ninth lens 290 may be made of polymer material, and the second lens 220, the fifth lens 250, and the eighth lens 280 may be made of plastic material.

[0099] At least one of the second lens 220, the fifth lens 250, and the eighth lens 280 may be made of a plastic material having optical properties different from those of the plastic material used to manufacture the other lenses. For example, the fifth lens 250 may be made of a plastic material having optical properties different from those of the plastic material used to manufacture the second lens 220 and the plastic material used to manufacture the eighth lens 280. Furthermore, the optical properties of the plastic material used to manufacture the second lens 220 may differ from those of the plastic material used to manufacture the eighth lens 280.

[0100] The fifth lens 250 may be a high refractive index lens with a refractive index of 1.6 or greater, and among the first lens 210 to the ninth lens 290, the refractive index of the fifth lens 250 may be the largest.

[0101] Among the first lens 210, second lens 220, and third lens 230 that form the first bonding lens CL1, the refractive index of the second lens 220 can be the smallest. Among the fourth lens 240, fifth lens 250, and sixth lens 260 that form the second bonding lens CL2, the refractive index of the fifth lens 250 can be the largest. Among the seventh lens 270, eighth lens 280, and ninth lens 290 that form the third bonding lens CL3, the refractive index of the eighth lens 280 can be the smallest.

[0102] The aspherical coefficients of each lens in the optical imaging system 200 according to the second embodiment of this disclosure are listed in Table 4 below. According to the second embodiment of this disclosure, the first lens 210 to the ninth lens 290 may have aspherical surfaces on both surfaces (object side and image side), and the first bonding lens CL1, the second bonding lens CL2 and the third bonding lens CL3 may also have aspherical surfaces on both surfaces (object side and image side).

[0103] Table 4

[0104] Figure 3A This is a configuration diagram of an optical imaging system according to a third embodiment of the present disclosure, and Figure 3B It is shown Figure 3A The diagram shows the aberration characteristics of the optical imaging system.

[0105] Reference Figure 3A 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 arranged sequentially along the optical axis of the optical imaging system 300 from the object side of the optical imaging system 300; a filter F; and an image sensor IS having an imaging surface IP, the focal point of which is formed on the imaging surface IP.

[0106] According to the third embodiment of the present disclosure, the optical imaging system 300 has a total focal length f of 9.31 mm, an IMG HT of 6.00 mm, and a FOV of 63.8°.

[0107] The characteristics of each element of the optical imaging system 300 according to the third embodiment of this disclosure are listed in Table 5 below.

[0108] Table 5

[0109] According to a third embodiment of this disclosure, the first lens 310 may have negative refractive power, with a convex object-side surface and a concave image-side surface. The second lens 320 may have positive refractive power, with a convex object-side surface and a concave image-side surface. The third lens 330 may have positive refractive power, with a convex object-side surface and a concave image-side surface. The fourth lens 340 may have negative refractive power, with a concave object-side surface and a convex image-side surface. The fifth lens 350 may have negative refractive power, and both its object-side and image-side surfaces may be concave. The sixth lens 360 may have positive refractive power, and both its object-side and image-side surfaces may be convex. The seventh lens 370 may have positive refractive power, with a convex object-side surface and a concave image-side surface. The eighth lens 380 may have negative refractive power, with a convex object-side surface and a concave image-side surface. The ninth lens 390 may have negative refractive power, with a convex object-side surface and a concave image-side surface.

[0110] According to a third embodiment of this disclosure, the first lens 310, the second lens 320, and the third lens 330 can form a first adhesive lens CL1, the fourth lens 340, the fifth lens 350, and the sixth lens 360 can form a second adhesive lens CL2, and the seventh lens 370, the eighth lens 380, and the ninth lens 390 can form a third adhesive lens CL3.

[0111] The first bonded lens CL1 can have positive refractive power, the second bonded lens CL2 can have negative refractive power, and the third bonded lens CL3 can have negative refractive power. The focal length of the first bonded lens CL1 is 8.97 mm (f123), the focal length of the second bonded lens CL2 is -71.86 mm (f456), and the focal length of the third bonded lens CL3 is -31.65 mm (f789).

[0112] The object-side surface of the first bonding lens CL1 can be convex, and its image-side surface can be concave. The object-side surface of the second bonding lens CL2 can be concave, and its image-side surface can be convex. The object-side surface of the third bonding lens CL3 can be convex, and its image-side surface can be concave.

[0113] According to a third embodiment of this disclosure, the first lens 310, the third lens 330, the fourth lens 340, the sixth lens 360, the seventh lens 370, and the ninth lens 390 may be made of polymer material, and the second lens 320, the fifth lens 350, and the eighth lens 380 may be made of glass material.

[0114] The second lens 320, the fifth lens 350, and the eighth lens 380 can each be made of a glass material having different optical properties from each other. For example, the second lens 320 can be made of a first glass material, the fifth lens 350 can be made of a second glass material, and the eighth lens 380 can be made of a third glass material. The optical properties of the first glass material can be different from those of the second and third glass materials. Furthermore, the optical properties of the second glass material can be different from those of the first and third glass materials. Additionally, the optical properties of the third glass material can be different from those of the first and second glass materials.

[0115] The fifth lens 350 may be a high refractive index lens with a refractive index of 1.6 or greater, and among the first lens 310 to the ninth lens 390, the refractive index of the fifth lens 350 may be the largest.

[0116] Among the first lens 310, second lens 320, and third lens 330 that form the first bonding lens CL1, the refractive index of the second lens 320 can be the smallest. Among the fourth lens 340, fifth lens 350, and sixth lens 360 that form the second bonding lens CL2, the refractive index of the fifth lens 350 can be the largest. Among the seventh lens 370, eighth lens 380, and ninth lens 390 that form the third bonding lens CL3, the refractive index of the eighth lens 380 can be the smallest.

[0117] The aspherical coefficients of each lens in the optical imaging system 300 according to the third embodiment of this disclosure are listed in Table 6 below. According to the third embodiment of this disclosure, the image-side surface of the first lens 310, the object-side surface and image-side surface of the second lens 320, and the object-side surface of the third lens 330 may be spherical; the object-side surface of the first lens 310 and the image-side surface of the third lens 330 may be aspherical; and the fourth lens 340 to the ninth lens 390 may have aspherical surfaces on both surfaces (object-side and image-side). Furthermore, the first bonding lens CL1, the second bonding lens CL2, and the third bonding lens CL3 may have aspherical surfaces on both surfaces (object-side and image-side).

[0118] Table 6

[0119] Table 7 below lists the parameter values ​​of the optical imaging systems according to the first to third embodiments of this disclosure.

[0120] Table 7

[0121] Table 8 below lists the values ​​of the conditional expressions for the optical imaging systems according to the first to third embodiments of this disclosure.

[0122] Table 8

[0123] In the optical imaging system according to embodiments of the present disclosure, high resolution can be achieved while reducing size. Furthermore, chromatic aberration can be improved.

[0124] While this disclosure includes specific examples, it will be apparent upon understanding the disclosure of this application that various changes in form and detail may be made without departing from the spirit and scope of the claims and their equivalents. 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 adhesive lens, a second adhesive lens, and a third adhesive lens are sequentially arranged along the optical axis of the optical imaging system, from the object side of the optical imaging system toward the imaging surface of the optical imaging system, and spaced apart from each other by a predetermined distance along the optical axis. Each of the first adhesive lens, the second adhesive lens, and the third adhesive lens includes: The central lens is made of plastic or glass. A first side lens, bonded to the object-side surface of the central lens, having refractive power, and made of a material different from that used to manufacture the central lens; and The second side lens, bonded to the image-side surface of the central lens, has refractive power and is made of a material different from that used to manufacture the central lens, and The optical imaging system has a total of three adhesive lenses.

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

3. The optical imaging system according to claim 1, wherein, The first adhesive lens includes a first lens, a second lens, and a third lens arranged sequentially along the optical axis from the object side of the first adhesive lens toward the imaging surface. The second adhesive lens includes a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object side of the second adhesive lens toward the imaging surface. The third bonding lens includes a seventh lens, an eighth lens, and a ninth lens arranged sequentially along the optical axis from the object side of the third bonding lens toward the imaging surface, and The second lens, the fifth lens, and the eighth lens are the central lenses of the first adhesive lens, the second adhesive lens, and the third adhesive lens, respectively.

4. The optical imaging system according to claim 3, wherein, The first lens has negative refractive power, and the second lens has positive refractive power.

5. The optical imaging system according to claim 3, wherein, The first lens has negative refractive power, the second lens has positive refractive power, and the fifth lens has negative refractive power.

6. The optical imaging system according to claim 3, wherein, The fifth lens has negative refractive power, and One of the fourth lens and the sixth lens has positive refractive power, and the other of the fourth lens and the sixth lens has negative refractive power.

7. The optical imaging system according to claim 3, wherein, One of the seventh lens and the eighth lens has positive refractive power, and the other of the seventh lens and the eighth lens has negative refractive power.

8. The optical imaging system according to claim 3, wherein, The following conditional expression is satisfied: 0 < (CTn-1+CTn+1) / CTn < 1 (n = 2, 5, 8), Wherein, CTn-1 is the thickness of the (n-1)th lens along the optical axis, CTn is the thickness of the nth lens along the optical axis, and CTn+1 is the thickness of the (n+1)th lens along the optical axis.

9. The optical imaging system according to claim 3, wherein, The following conditional expression is satisfied: 0 ≤ |f1 / v1-f2 / v2| < 4, 0 ≤ |f2 / v2-f3 / v3| < 4, Where 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, v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, and v3 is the Abbe number of the third lens.

10. The optical imaging system according to claim 3, wherein, The following conditional expression is satisfied: 0.6 < TTL / (2×IMGHT) < 1.0 Wherein, TTL is the distance along the optical axis from the object side of the first lens to the imaging surface, and IMGHT is half the diagonal length of the imaging surface.

11. The optical imaging system according to claim 3, wherein, The refractive index of the fifth lens is the highest among the refractive indices of the first lens to the ninth lens.

12. The optical imaging system according to claim 3, wherein, The second lens, the fifth lens, and the eighth lens are each made of plastic material, and The plastic material used to manufacture the fifth lens has optical properties that are different from those of the plastic material used to manufacture the second lens and the plastic material used to manufacture the eighth lens.

13. The optical imaging system according to claim 12, wherein, Each of the first lens to the ninth lens has an aspherical object side and an aspherical image side.

14. The optical imaging system according to claim 3, wherein, The second lens, the fifth lens, and the eighth lens are each made of glass materials with different optical properties.

15. The optical imaging system according to claim 14, wherein, One or both of the object-side surface and the image-side surface of each of the first lens, the second lens, and the third lens are spherical surfaces.

16. The optical imaging system according to claim 3, wherein, The first lens has an aspherical object-side surface and a spherical image-side surface. The second lens has a spherical object-side surface and a spherical image-side surface. The third lens has a spherical object-side surface and an aspherical image-side surface, and Each of the fourth to ninth lenses has an aspherical object side and an aspherical image side.

17. The optical imaging system according to claim 3, wherein, The first lens, the second lens, the third lens, the seventh lens, the eighth lens, and the ninth lens each have a convex object-side surface in their paraxial region, and The fourth lens has a concave object-side surface in its paraxial region.

18. The optical imaging system according to claim 3, wherein, The first lens, the second lens, the third lens, the seventh lens, and the eighth lens each have a concave image-side surface in their paraxial region, and The sixth lens has a convex image-side surface in its paraxial region.

19. The optical imaging system according to claim 1, wherein, The object-side surface and the image-side surface of each of the first adhesive lens, the second adhesive lens and the third adhesive lens are aspherical surfaces.

20. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: 1.5 < f / EPD < 2.5 Where 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.

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