Optical image capturing system

Abstract

The optical imaging system includes a first lens having refractive power, a second lens having negative refractive power, a third lens having positive refractive power, a fourth lens having negative refractive power, a fifth lens having positive refractive power, a sixth lens having negative refractive power, and a sixth lens having negative refractive power, which are sequentially disposed along an optical axis of the optical imaging system from an object side of the optical imaging system toward an imaging surface of the optical imaging system. A fifth lens having refractive power, and a sixth lens having refractive power, in which conditional expressions 0.85 < = TTL / f < = 1.0 and 0.5 < = f1 / f < = 1 are satisfied, in which TTL is a distance from an object-side surface to an imaging surface of the first lens along an optical axis, f is a total focal length of the optical imaging system, and f1 is a focal length of the first lens.

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0154672, filed on November 4, 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] Recently, foldable camera modules have been used in portable terminals, which have reflective components such as prisms in front of the lens to change the path of incident light.

[0005] These folding camera modules have a relatively long overall length, so they can be used in telephoto cameras with relatively long focal lengths.

[0006] Telephoto cameras typically have lower resolution than wide-angle cameras and are less efficient in low-light conditions. These drawbacks are particularly noticeable when capturing images at high magnification. Summary of the Invention

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

[0008] In one general aspect, the optical imaging system includes a first lens with refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with negative refractive power, a fifth lens with refractive power, and a sixth lens with refractive power, 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, wherein the conditions 0.85 ≤ TTL / f ≤ 1.0 and 0.5 ≤ f1 / f ≤ 1 are satisfied, where TTL is the distance along the optical axis from the object side of the first lens to the imaging surface, f is the total focal length of the optical imaging system, and f1 is the focal length of the first lens.

[0009] The third lens may have a concave image side in its paraxial region, and the fourth lens may have a convex object side in its paraxial region.

[0010] The first and second lenses can be D-shaped cut lenses.

[0011] The fifth lens may have a convex image-side surface in its paraxial region, and the sixth lens may have a convex object-side surface in its paraxial region.

[0012] It can satisfy the conditional expression 100 ≤ v1 + v3 ≤ 120, where v1 is the Abbe number of the first lens and v3 is the Abbe number of the third lens.

[0013] The condition expression 0.8 ≤ R1 / R5 ≤ 1.2 can be satisfied, where R1 is the radius of curvature of the object side of the first lens at the optical axis, and R5 is the radius of curvature of the object side of the third lens at the optical axis.

[0014] The condition 0.2 < IMG HT / EPD ≤ 0.4 can be satisfied, where IMG HT is half the diagonal length of the imaging plane and EPD is the diameter of the entrance pupil of the optical imaging system.

[0015] The condition expression 0.2 ≤ (CT1+CT2+CT3+CT4) / f ≤ 0.5 can be satisfied, where CT1 is the thickness of the first lens along the optical axis, CT2 is the thickness of the second lens along the optical axis, CT3 is the thickness of the third lens along the optical axis, and CT4 is the thickness of the fourth lens along the optical axis.

[0016] The condition 0.2 ≤ D45 / Td ≤ 0.4 can be satisfied, where D45 is the distance along the optical axis from the image side of the fourth lens to the object side of the fifth lens, and Td is the distance along the optical axis from the object side of the first lens to the image side of the sixth lens.

[0017] The first lens can be a D-shaped cut lens with a major axis and a minor axis perpendicular to the major axis, and can satisfy the conditional expression 0.5 < AR1 < 1.0, where AR1 is equal to the aspect ratio of the maximum effective radius of the object side of the D-shaped cut lens along the major axis of the D-shaped cut lens to the maximum effective radius of the object side of the D-shaped cut lens along the minor axis of the D-shaped cut lens.

[0018] The condition 0.3 < ΣCT / TTL < 0.5 can be satisfied, where ΣCT is the sum of the thicknesses of the first to sixth lenses along the optical axis.

[0019] The conditional expression -1.0 < f1 / f2 < 0 can be satisfied, where f2 is the focal length of the second lens.

[0020] In another general aspect, the optical imaging system includes, along the optical axis of the optical imaging system, a first lens having refractive power, a second lens having refractive power, a third lens having positive refractive power and having a concave image-side surface in its paraxial region, a fourth lens having negative refractive power and having a convex object-side surface in its paraxial region, a fifth lens having refractive power, and a sixth lens having a convex object-side surface in its paraxial region, wherein the conditions 1.7 < f-number < 2.0 and 0.2 < IMGHT / EPD ≤ 0.4 are satisfied, where the f-number is the f-number of the optical imaging system, IMGHT is half the diagonal length of the image surface, and EPD is the diameter of the entrance pupil of the optical imaging system.

[0021] The first to sixth lenses can be spaced apart from each other by a corresponding distance along the optical axis, and the distance between the fourth and fifth lenses along the optical axis can be greater than each of the distances between the first and second lenses along the optical axis, the distances between the second and third lenses along the optical axis, the distances between the third and fourth lenses along the optical axis, and the distances between the fifth and sixth lenses along the optical axis.

[0022] The condition 0.2 ≤ D45 / Td ≤ 0.4 can be satisfied, where D45 is the distance along the optical axis from the image side of the fourth lens to the object side of the fifth lens, and Td is the distance along the optical axis from the object side of the first lens to the image side of the sixth lens.

[0023] The condition expression 0.8 ≤ R1 / R5 ≤ 1.2 can be satisfied, where R1 is the radius of curvature of the object side of the first lens at the optical axis, and R5 is the radius of curvature of the object side of the third lens at the optical axis.

[0024] The condition 0.2 ≤ (CT1+CT2+CT3+CT4) / f ≤ 0.5 can be satisfied, where CT1 is the thickness of the first lens along the optical axis, CT2 is the thickness of the second lens along the optical axis, CT3 is the thickness of the third lens along the optical axis, CT4 is the thickness of the fourth lens along the optical axis, and f is the total focal length of the optical imaging system.

[0025] The optical imaging system may also include a light path changing member disposed on the object side of the first lens for changing the path of light, wherein one or more of the first to sixth lenses may be D-shaped cut lenses.

[0026] The fifth lens can have positive refractive power, and the sixth lens can have negative refractive power.

[0027] The first lens can be a D-shaped cut lens with a major axis and a minor axis perpendicular to the major axis, and can satisfy the conditional expression 0.5 < AR1 < 1.0, where AR1 is equal to the aspect ratio of the maximum effective radius of the object side of the D-shaped cut lens along the major axis of the D-shaped cut lens to the maximum effective radius of the object side of the D-shaped cut lens along the minor axis of the D-shaped cut lens.

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

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

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

[0031] Figure 2A This is a configuration diagram of an optical imaging system according to a second embodiment of the present disclosure.

[0032] Figure 2B It is shown Figure 2A The diagram shows the aberration characteristics of the optical imaging system.

[0033] Figure 3A This is a configuration diagram of an optical imaging system according to a third embodiment of the present disclosure.

[0034] Figure 3B It is shown Figure 3A The diagram shows the aberration characteristics of the optical imaging system.

[0035] Figure 4A This is a configuration diagram of an optical imaging system according to a fourth embodiment of the present disclosure.

[0036] Figure 4B It is shown Figure 4A The diagram shows the aberration characteristics of the optical imaging system.

[0037] Figure 5A This is a configuration diagram of an optical imaging system according to a fifth embodiment of the present disclosure.

[0038] Figure 5B It is shown Figure 5A The diagram shows the aberration characteristics of the optical imaging system.

[0039] Figure 6A This is a configuration diagram of an optical imaging system according to a sixth embodiment of the present disclosure.

[0040] Figure 6B It is shown Figure 6AThe diagram shows the aberration characteristics of the optical imaging system.

[0041] Figure 7A This is a configuration diagram of an optical imaging system according to the seventh embodiment of the present disclosure.

[0042] Figure 7B It is shown Figure 7A The diagram shows the aberration characteristics of the optical imaging system.

[0043] Figure 8A This is a configuration diagram of an optical imaging system according to the eighth embodiment of the present disclosure.

[0044] Figure 8B It is shown Figure 8A The diagram shows the aberration characteristics of the optical imaging system.

[0045] Figure 9A This is a configuration diagram of an optical imaging system according to the ninth embodiment of the present disclosure.

[0046] Figure 9B It is shown Figure 9A The diagram shows the aberration characteristics of the optical imaging system.

[0047] Figure 10 This is a diagram showing an optical imaging system including optical path changing components.

[0048] 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

[0049] 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.

[0050] 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.

[0051] 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.

[0052] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more items.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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 the shapes of the lenses are not limited thereto.

[0057] In this specification, the first lens refers to the lens closest to the object side of the optical imaging system, and the sixth lens refers to the lens closest to the imaging surface (or image sensor) of the optical imaging system.

[0058] In addition, in this specification, the radius of curvature of the lens surface, the thickness of the lens, the distance between lenses or other components, the focal length of the lens, and other dimensions are expressed in millimeters (mm).

[0059] 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.

[0060] 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.

[0061] The paraxial region of a lens surface is a very narrow area on the lens surface that is close to the optical axis.

[0062] More specifically, the paraxial region of the lens surface is the central portion of the lens surface that surrounds and includes 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 sinθ ≈ θ, tan θ ≈ θ, and cos θ ≈ 1 are valid.

[0063] In this specification, the effective diameter of the lens surface is the diameter of the portion of the lens surface through which light actually passes, and is equal to twice the effective radius of the lens surface. The object-side surface and the image-side surface of the lens may have different effective diameters or effective radii.

[0064] An optical imaging system according to an embodiment of the present disclosure may include six lenses. 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, and a sixth 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.

[0065] However, the optical imaging system according to embodiments of this disclosure may consist of more than six 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 also include an infrared blocking filter (hereinafter referred to as a filter) for blocking light in the infrared region from incident onto the image sensor.

[0066] Additionally, the optical imaging system may include an aperture for controlling the amount of light passing through the optical imaging system. Furthermore, the optical imaging system may include a light path changing component for altering the path of light. For example, the light path changing component may be disposed on the object side of the first lens and may be configured as a prism or a mirror, but is not limited thereto.

[0067] Optical imaging systems may include lenses made of plastic materials. For example, the first through sixth lenses may all be made of plastic materials.

[0068] Furthermore, at least one of the first to sixth lenses may have an aspherical surface. For example, each of the first to sixth lenses may have at least one aspherical surface. The aspherical surfaces of the first to sixth lenses are defined by Equation 1 below.

[0069] Equation 1:

[0070] 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.

[0071] 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.

[0072] 0.5 < AR1 < 1.0 (Conditional expression 1)

[0073] 0.2 < IMG HT / EPD ≤ 0.4 (Conditional expression 2)

[0074] 0.2 ≤ (CT1+CT2+CT3+CT4) / f ≤ 0.5 (Conditional expression 3)

[0075] 0.85 ≤ TTL / f ≤ 1.0 (Conditional expression 4)

[0076] 0.2 ≤ D45 / Td ≤ 0.4 (Conditional expression 5)

[0077] 0.5 ≤ f1 / f ≤ 1 (Conditional expression 6)

[0078] 100 ≤ v1+v3 ≤ 120 (Conditional expression 7)

[0079] 0.8 ≤ R1 / R5 ≤ 1.2 (Conditional expression 8)

[0080] 1.7 < f_number < 2.0 (Conditional expression 9)

[0081] 0.3 < ΣCT / TTL < 0.5 (Conditional expression 10)

[0082] -1.0 < f1 / f2 < 0 (Conditional expression 11)

[0083] In conditional expression 1, AR1 refers to the aspect ratio of the maximum effective diameter or radius of the object-side surface of the first lens along the major axis of the first lens to the maximum effective diameter or radius of the object-side surface of the first lens along the minor axis of the first lens, which is perpendicular to the major axis of the first lens. Conditional expression 1 indicates that the first lens is a D-shaped cut lens comprising a pair of arcuate portions and a pair of straight portions extending between the arcuate portions, and can be a design condition for reducing module height. The distance between the arcuate portions is the major axis diameter of the D-shaped cut lens and is equal to twice the major axis radius of the D-shaped cut lens. The distance between the straight portions is the minor axis diameter of the D-shaped cut lens and is equal to twice the minor axis radius of the D-shaped cut lens. The minor axis is perpendicular to the major axis.

[0084] In conditional expression 2, IMG HT is half the diagonal length of the imaging plane of the optical imaging system, and EPD is the diameter of the entrance pupil of the optical imaging system. Conditional expression 2 is a design condition used to reduce the f-number.

[0085] In conditional expression 3, CT1 is the thickness of the first lens along the optical axis, CT2 is the thickness of the second lens along the optical axis, CT3 is the thickness of the third lens along the optical axis, CT4 is the thickness of the fourth lens along the optical axis, and f is the total focal length of the optical imaging system. Conditional expression 3 is a design condition for reducing the f-number. According to embodiments of this disclosure, a low f-number relative to the focal length can be achieved by placing a thick lens at the front of the optical imaging system.

[0086] In conditional expression 4, TTL is the distance along the optical axis from the object side of the first lens to the imaging plane, and f is the total focal length of the optical imaging system. Conditional expression 4 represents the telephoto ratio of the optical imaging system, and if the telephoto ratio is outside the range of conditional expression 4, telephoto camera performance may not be achievable.

[0087] In conditional expression 5, D45 is the distance along the optical axis from the image-side surface of the fourth lens to the object-side surface of the fifth lens, and Td is the distance along the optical axis from the object-side surface of the first lens to the image-side surface of the sixth lens. Conditional expression 5 is a design condition used to ensure lens performance. According to embodiments of this disclosure, the front lens group and the rear lens group are configured with sufficient gap between them to achieve uniform overall lens performance.

[0088] In conditional expression 6, f1 is the focal length of the first lens, and f is the total focal length of the optical imaging system. Conditional expression 6 relates to the refractive power of the first lens, and if f / f1 is outside the range of conditional expression 6, the light rays may not converge effectively.

[0089] In conditional expression 7, v1 is the Abbe number of the first lens, and v3 is the Abbe number of the third lens. Conditional expression 7 is the condition for balancing the Abbe numbers to effectively correct chromatic aberration.

[0090] In conditional expression 8, R1 is the radius of curvature of the object-side surface of the first lens, and R5 is the radius of curvature of the object-side surface of the third lens. Conditional expression 8 is the lens shape (radius of curvature) condition for effective ray convergence.

[0091] In conditional expression 9, the f-number is a numerical value representing the brightness of the optical imaging system.

[0092] In conditional expression 10, ΣCT is the sum of the thicknesses of the first to sixth lenses along the optical axis, and TTL is the distance along the optical axis from the object side of the first lens to the imaging plane. Conditional expression 10 is a suitable thickness condition for lenses that can effectively correct aberrations while reducing the overall length of the optical imaging system.

[0093] In conditional expression 11, f1 is the focal length of the first lens, and f2 is the focal length of the second lens. Conditional expression 11 relates to the performance used to correct chromatic aberration.

[0094] 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.

[0095] Reference Figure 1A The optical imaging system 100 according to a first embodiment of this disclosure may include: a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, and a sixth lens 160 arranged sequentially from the object side; a filter F; and an image sensor IS, the image sensor IS having an imaging surface IP on which a focal point can be formed. Furthermore, the optical imaging system 100 may also include a light path changing member (in...) disposed on the object side of the first lens 110 for changing the path of light. Figure 1A Not shown in the image, but see [link / reference]. Figure 10 ), and an aperture stop (not shown) disposed on the object side of the fourth lens 140.

[0096] According to the first embodiment of this disclosure, the optical imaging system 100 has a total focal length f of 19.410 mm, an IMG HT of 3.584 mm, and an f-number of 1.93.

[0097] The characteristics of each element of the optical imaging system 100 according to the first embodiment of this disclosure are shown in Table 1 below.

[0098] Table 1

[0099] According to a first embodiment of this disclosure, the first lens 110 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 120 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The third lens 130 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. The fourth lens 140 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The fifth lens 150 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The sixth lens 160 may have negative refractive power and may have a convex object-side surface and a concave image-side surface.

[0100] According to a first embodiment of this disclosure, the first lens 110 and the second lens 120 may be D-shaped cut lenses.

[0101] Table 2 below shows the aspherical coefficients of each lens of the optical imaging system 100 according to a first embodiment of the present disclosure. According to the first embodiment of the present disclosure, the first lens 110 to the sixth lens 160 may have aspherical surfaces on both surfaces (object side and image side).

[0102] Table 2

[0103] 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.

[0104] Reference Figure 2A The optical imaging system 200 according to a second embodiment of this disclosure may include: a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, and a sixth lens 260 arranged sequentially from the object side; a filter F; and an image sensor IS, the image sensor IS having an imaging surface IP on which a focal point can be formed. Furthermore, the optical imaging system 200 may also include a light path changing member (in...) disposed on the object side of the first lens 210 for changing the path of light. Figure 2A Not shown in the image, but see [link / reference]. Figure 10 ), and an aperture stop (not shown) disposed on the object side of the fourth lens 240.

[0105] According to the second embodiment of this disclosure, the optical imaging system 200 has a total focal length f of 19.409 mm, an IMG HT of 3.584 mm, and an f-number of 1.93.

[0106] The characteristics of each element of the optical imaging system 200 according to the second embodiment of this disclosure are shown in Table 3 below.

[0107] Table 3

[0108] According to a second embodiment of this disclosure, the first lens 210 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 220 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The third lens 230 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. The fourth lens 240 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The fifth lens 250 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The sixth lens 260 may have negative refractive power and may have a convex object-side surface and a concave image-side surface.

[0109] According to a second embodiment of this disclosure, the first lens 210 and the second lens 220 may be D-shaped cut lenses.

[0110] Table 4 below shows the aspherical coefficients of each lens of the optical imaging system 200 according to a second embodiment of the present disclosure. According to the second embodiment of the present disclosure, the first lens 210 to the sixth lens 260 may have aspherical surfaces on both surfaces (object side and image side).

[0111] Table 4

[0112] 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.

[0113] Reference Figure 3A The optical imaging system 300 according to the third embodiment of this disclosure may include: a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, and a sixth lens 360 arranged sequentially from the object side; a filter F; and an image sensor IS, the image sensor IS having an imaging surface IP on which a focal point can be formed. Furthermore, the optical imaging system 300 may also include a light path changing member (in...) disposed on the object side of the first lens 310 for changing the path of light. Figure 3A Not shown in the image, but see [link / reference]. Figure 10 ), and an aperture stop (not shown) disposed on the object side of the fourth lens 340.

[0114] According to the third embodiment of the present disclosure, the optical imaging system 300 has a total focal length f of 19.408 mm, an IMG HT of 3.584 mm, and an f-number of 1.93.

[0115] The characteristics of each element of the optical imaging system 300 according to the third embodiment of this disclosure are shown in Table 5 below.

[0116] Table 5

[0117] According to a third embodiment of this disclosure, the first lens 310 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 320 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The third lens 330 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. The fourth lens 340 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The fifth lens 350 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The sixth lens 360 may have negative refractive power and may have a convex object-side surface and a concave image-side surface.

[0118] According to a third embodiment of this disclosure, the first lens 310 and the second lens 320 may be D-shaped cut lenses.

[0119] Table 6 below shows the aspherical coefficients of each lens of the optical imaging system 300 according to a third embodiment of the present disclosure. According to the third embodiment of the present disclosure, the first lens 310 to the sixth lens 360 may have aspherical surfaces on both surfaces (object side and image side).

[0120] Table 6

[0121] Figure 4A This is a configuration diagram of an optical imaging system according to a fourth embodiment of the present disclosure, and Figure 4B It is shown Figure 4A The diagram shows the aberration characteristics of the optical imaging system.

[0122] Reference Figure 4A The optical imaging system 400 according to the fourth embodiment of this disclosure may include: a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, and a sixth lens 460 arranged sequentially from the object side; a filter F; and an image sensor IS, the image sensor IS having an imaging surface IP on which a focal point can be formed. Furthermore, the optical imaging system 400 may also include a light path changing member (in...) disposed on the object side of the first lens 410 for changing the path of light. Figure 4A Not shown in the image, but see [link / reference]. Figure 10 ), and an aperture stop (not shown) disposed on the object side of the fourth lens 440.

[0123] According to the fourth embodiment of this disclosure, the optical imaging system 400 has a total focal length f of 19.407 mm, an IMG HT of 3.584 mm, and an f-number of 1.93.

[0124] The characteristics of each element of the optical imaging system 400 according to the fourth embodiment of this disclosure are shown in Table 7 below.

[0125] Table 7

[0126] According to a fourth embodiment of this disclosure, the first lens 410 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 420 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The third lens 430 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. The fourth lens 440 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The fifth lens 450 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The sixth lens 460 may have negative refractive power and may have a convex object-side surface and a concave image-side surface.

[0127] According to a fourth embodiment of this disclosure, the first lens 410 and the second lens 420 may be D-shaped cut lenses.

[0128] Table 8 below shows the aspherical coefficients of each lens of the optical imaging system 400 according to a fourth embodiment of the present disclosure. According to the fourth embodiment of the present disclosure, the first lens 410 to the sixth lens 460 may have aspherical surfaces on both surfaces (object side and image side).

[0129] Table 8

[0130] Figure 5A This is a configuration diagram of an optical imaging system according to a fifth embodiment of the present disclosure, and Figure 5B It is shown Figure 5A The diagram shows the aberration characteristics of the optical imaging system.

[0131] Reference Figure 5A The optical imaging system 500 according to the fifth embodiment of this disclosure may include: a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, and a sixth lens 560 arranged sequentially from the object side; a filter F; and an image sensor IS, the image sensor IS having an imaging surface IP on which a focal point can be formed. Furthermore, the optical imaging system 500 may also include a light path changing member (in...) disposed on the object side of the first lens 510 for changing the path of light. Figure 5A Not shown in the image, but see [link / reference]. Figure 10 ), and an aperture stop (not shown) disposed on the object side of the fourth lens 540.

[0132] According to the fifth embodiment of this disclosure, the optical imaging system 500 has a total focal length f of 19.410 mm, an IMG HT of 3.584 mm, and an f-number of 1.93.

[0133] The characteristics of each element of the optical imaging system 500 according to the fifth embodiment of this disclosure are shown in Table 9 below.

[0134] Table 9

[0135] According to a fifth embodiment of this disclosure, the first lens 510 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 520 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The third lens 530 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. The fourth lens 540 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The fifth lens 550 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The sixth lens 560 may have negative refractive power and may have a convex object-side surface and a concave image-side surface.

[0136] According to a fifth embodiment of this disclosure, the first lens 510 and the second lens 520 may be D-shaped cut lenses.

[0137] Table 10 below shows the aspherical coefficients of each lens of the optical imaging system 500 according to a fifth embodiment of the present disclosure. According to the fifth embodiment of the present disclosure, the first lens 510 to the sixth lens 560 may have aspherical surfaces on both surfaces (object side and image side).

[0138] Table 10

[0139] Figure 6A This is a configuration diagram of an optical imaging system according to a sixth embodiment of the present disclosure, and Figure 6B It is shown Figure 6A The diagram shows the aberration characteristics of the optical imaging system.

[0140] Reference Figure 6A The optical imaging system 600 according to the sixth embodiment of this disclosure may include: a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, a fifth lens 650, and a sixth lens 660 arranged sequentially from the object side; a filter F; and an image sensor IS, the image sensor IS having an imaging surface IP on which a focal point can be formed. Furthermore, the optical imaging system 600 may also include a light path changing member (in...) disposed on the object side of the first lens 610 for changing the path of light. Figure 6A Not shown in the image, but see [link / reference]. Figure 10 ), and an aperture stop (not shown) disposed on the object side of the fourth lens 640.

[0141] According to the sixth embodiment of the present disclosure, the optical imaging system 600 has a total focal length f of 19.409 mm, an IMG HT of 3.584 mm, and an f-number of 1.93.

[0142] The characteristics of each element of the optical imaging system 600 according to the sixth embodiment of the present disclosure are shown in Table 11 below.

[0143] Table 11

[0144] According to a sixth embodiment of this disclosure, the first lens 610 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 620 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The third lens 630 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. The fourth lens 640 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The fifth lens 650 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The sixth lens 660 may have negative refractive power and may have a convex object-side surface and a concave image-side surface.

[0145] According to a sixth embodiment of this disclosure, the first lens 610 and the second lens 620 may be D-shaped cut lenses.

[0146] Table 12 below shows the aspherical coefficients of each lens of the optical imaging system 600 according to a sixth embodiment of the present disclosure. According to the sixth embodiment of the present disclosure, the first lens 610 to the sixth lens 660 may have aspherical surfaces on both surfaces (object side and image side).

[0147] Table 12

[0148] Figure 7A This is a configuration diagram of an optical imaging system according to the seventh embodiment of the present disclosure, and Figure 7B It is shown Figure 7A The diagram shows the aberration characteristics of the optical imaging system.

[0149] Reference Figure 7AThe optical imaging system 700 according to the seventh embodiment of this disclosure may include: a first lens 710, a second lens 720, a third lens 730, a fourth lens 740, a fifth lens 750, and a sixth lens 760 arranged sequentially from the object side; a filter F; and an image sensor IS, the image sensor IS having an imaging surface IP on which a focal point can be formed. Furthermore, the optical imaging system 700 may also include a light path changing member (in...) disposed on the object side of the first lens 710 for changing the path of light. Figure 7A Not shown in the image, but see [link / reference]. Figure 10 ), and an aperture stop (not shown) disposed on the object side of the fourth lens 740.

[0150] According to the seventh embodiment of the present disclosure, the optical imaging system 700 has a total focal length f of 19.406 mm, an IMG HT of 3.584 mm, and an f-number of 1.97.

[0151] The characteristics of each element of the optical imaging system 700 according to the seventh embodiment of the present disclosure are shown in Table 13 below.

[0152] Table 13

[0153] According to a seventh embodiment of this disclosure, the first lens 710 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 720 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The third lens 730 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. The fourth lens 740 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The fifth lens 750 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The sixth lens 760 may have negative refractive power and may have a convex object-side surface and a concave image-side surface.

[0154] According to the seventh embodiment of this disclosure, the first lens 710 and the second lens 720 may be D-shaped cut lenses.

[0155] Table 14 below shows the aspherical coefficients of each lens of the optical imaging system 700 according to the seventh embodiment of the present disclosure. According to the seventh embodiment of the present disclosure, the first lens 710 to the sixth lens 760 may have aspherical surfaces on both surfaces (object side and image side).

[0156] Table 14

[0157] Figure 8AThis is a configuration diagram of an optical imaging system according to the eighth embodiment of this disclosure, and Figure 8B It is shown Figure 8A The diagram shows the aberration characteristics of the optical imaging system.

[0158] Reference Figure 8A The optical imaging system 800 according to the eighth embodiment of this disclosure may include: a first lens 810, a second lens 820, a third lens 830, a fourth lens 840, a fifth lens 850, and a sixth lens 860 arranged sequentially from the object side; a filter F; and an image sensor IS, the image sensor IS having an imaging surface IP on which a focal point can be formed. Furthermore, the optical imaging system 800 may also include a light path changing member (in...) disposed on the object side of the first lens 810 for changing the path of light. Figure 8A Not shown in the image, but see [link / reference]. Figure 10 ), and an aperture (not shown) disposed on the object side of the fourth lens 840.

[0159] According to the eighth embodiment of the present disclosure, the optical imaging system 800 has a total focal length f of 19.406 mm, an IMG HT of 3.584 mm, and an f number of 1.97.

[0160] The characteristics of each element of the optical imaging system 800 according to the eighth embodiment of this disclosure are shown in Table 15 below.

[0161] Table 15

[0162] According to the eighth embodiment of this disclosure, the first lens 810 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 820 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The third lens 830 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. The fourth lens 840 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The fifth lens 850 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The sixth lens 860 may have negative refractive power and may have a convex object-side surface and a concave image-side surface.

[0163] According to the eighth embodiment of this disclosure, the first lens 810 and the second lens 820 may be D-shaped cut lenses.

[0164] Table 16 below shows the aspherical coefficients of each lens in the optical imaging system 800 according to the eighth embodiment of the present disclosure. According to the eighth embodiment of the present disclosure, the first lens 810 to the sixth lens 860 may have aspherical surfaces on both surfaces (object side and image side).

[0165] Table 16

[0166] Figure 9A This is a configuration diagram of an optical imaging system according to the ninth embodiment of this disclosure, and Figure 9B It is shown Figure 9A The diagram shows the aberration characteristics of the optical imaging system.

[0167] Reference Figure 9A The optical imaging system 900 according to the ninth embodiment of this disclosure may include: a first lens 910, a second lens 920, a third lens 930, a fourth lens 940, a fifth lens 950, and a sixth lens 960 arranged sequentially from the object side; a filter F; and an image sensor IS, the image sensor IS having an imaging surface IP on which a focal point can be formed. Furthermore, the optical imaging system 900 may also include a light path changing member (in...) disposed on the object side of the first lens 910 for changing the path of light. Figure 9A Not shown in the image, but see [link / reference]. Figure 10 ), and an aperture (not shown) disposed on the object side of the fourth lens 940.

[0168] According to the ninth embodiment of this disclosure, the optical imaging system 900 has a total focal length f of 19.409 mm, an IMG HT of 3.584 mm, and an f-number of 1.86.

[0169] The characteristics of each element of the optical imaging system 900 according to the ninth embodiment of this disclosure are shown in Table 17 below.

[0170] Table 17

[0171] According to the ninth embodiment of this disclosure, the first lens 910 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 920 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The third lens 930 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. The fourth lens 940 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The fifth lens 950 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The sixth lens 960 may have negative refractive power and may have a convex object-side surface and a concave image-side surface.

[0172] According to the ninth embodiment of this disclosure, the first lens 910 and the second lens 920 may be D-shaped cut lenses.

[0173] Table 18 below shows the aspherical coefficients of each lens of the optical imaging system 900 according to the ninth embodiment of the present disclosure. According to the ninth embodiment of the present disclosure, the first lens 910 to the sixth lens 960 may have aspherical surfaces on both surfaces (object side and image side).

[0174] Table 18

[0175] Table 19 below shows the focal lengths of the first to sixth lenses of the optical imaging system according to the first to ninth embodiments of the present disclosure, and Table 20 below shows the conditional expression values ​​of the optical imaging system according to the first to ninth embodiments of the present disclosure.

[0176] Table 19

[0177] Table 20

[0178] Figure 10 This is a diagram showing an optical imaging system including optical path changing components.

[0179] Reference Figure 10 The optical imaging system may include: an imaging lens system 1000, which includes a first lens to a sixth lens according to any one of the first to ninth embodiments of the present disclosure; a light path changing member 2000; and an image sensor 3000. The light path changing member 2000 can change the path of light incident on the imaging lens system 1000, and may be disposed on the object side of the first lens of the imaging lens system 1000. The image sensor 3000 may be disposed on... Figure 10 On the image side of the sixth lens of the imaging lens system 1000.

[0180] Figure 10 A light path changing member 2000 configured as a prism is shown. However, the light path changing member 2000 is not limited to a prism, but can be configured as a mirror, for example.

[0181] Figure 10 The optical imaging system may also include a filter disposed between the imaging lens system 1000 and the image sensor 3000. Figure 10 Not shown in the image, but see [link / reference]. Figure 1A , Figure 2A , Figure 3A , Figure 4A , Figure 5A , Figure 6A , Figure 7A , Figure 8A and Figure 9A ).

[0182] An optical imaging system according to embodiments of the present disclosure can improve the brightness and resolution of images captured by a high-magnification telephoto camera.

[0183] 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 to these examples 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: 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, are arranged sequentially a first lens with refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with negative refractive power, a fifth lens with refractive power, and a sixth lens with refractive power. The following conditional expression is satisfied: 0.85 ≤ TTL / f ≤ 1.0 0.5 ≤ f1 / f ≤ 1, Where TTL is the distance along the optical axis from the object side of the first lens to the imaging plane, f is the total focal length of the optical imaging system, and f1 is the focal length of the first lens. The optical imaging system has a total of six lenses.

2. The optical imaging system according to claim 1, wherein, The third lens has a concave image-side surface in its paraxial region, and the fourth lens has a convex object-side surface in its paraxial region.

3. The optical imaging system according to claim 1, wherein, The first lens and the second lens are D-shaped cut lenses.

4. The optical imaging system according to claim 1, wherein, The fifth lens has a convex image-side surface in its paraxial region, and the sixth lens has a convex object-side surface in its paraxial region.

5. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: 100 ≤ v1 + v3 ≤ 120, Wherein, v1 is the Abbe number of the first lens, and v3 is the Abbe number of the third lens.

6. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: 0.8 ≤ R1 / R5 ≤ 1.2 Wherein, R1 is the radius of curvature of the object-side surface of the first lens at the optical axis, and R5 is the radius of curvature of the object-side surface of the third lens at the optical axis.

7. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: 0.2 < IMG HT / EPD ≤ 0.4 Wherein, IMG HT is half the diagonal length of the imaging surface, and EPD is the diameter of the entrance pupil of the optical imaging system.

8. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: 0.2 ≤ (CT1+CT2+CT3+CT4) / f ≤ 0.5, Wherein, CT1 is the thickness of the first lens along the optical axis, CT2 is the thickness of the second lens along the optical axis, CT3 is the thickness of the third lens along the optical axis, and CT4 is the thickness of the fourth lens along the optical axis.

9. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: 0.2 ≤ D45 / Td ≤ 0.4, Wherein, D45 is the distance along the optical axis from the image side of the fourth lens to the object side of the fifth lens, and Td is the distance along the optical axis from the object side of the first lens to the image side of the sixth lens.

10. The optical imaging system according to claim 1, wherein, The first lens is a D-shaped cut lens having a long axis and a short axis perpendicular to the long axis, and The following conditional expression is satisfied: 0.5 < AR1 < 1.0, Wherein, AR1 is equal to the aspect ratio of the maximum effective radius of the object side surface of the D-shaped cut lens along the major axis of the D-shaped cut lens to the maximum effective radius of the object side surface of the D-shaped cut lens along the minor axis of the D-shaped cut lens.

11. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: 0.3 < ΣCT / TTL < 0.5, Wherein, ΣCT is the sum of the thicknesses of the first lens to the sixth lens along the optical axis.

12. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: -1.0 < f1 / f2 < 0, Where f2 is the focal length of the second lens.

13. An optical imaging system, including: The first lens has refractive power. The second lens has refractive power. The third lens has positive refractive power and a concave image-side surface in its paraxial region. The fourth lens has negative refractive power and a convex object-side surface in its paraxial region. The fifth lens has refractive power, and The sixth lens has a convex object-side surface in its paraxial region. The first lens to the sixth lens are 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; The following conditional expression is satisfied: 1.7 < f-number < 2.0 0.2 < IMG HT / EPD ≤ 0.4 Wherein, f-number is the f-number of the optical imaging system, IMG HT is half the diagonal length of the imaging plane, and EPD is the diameter of the entrance pupil of the optical imaging system. The optical imaging system has a total of six lenses.

14. The optical imaging system according to claim 13, wherein, The first lens to the sixth lens are spaced apart from each other by a predetermined distance along the optical axis, and the distance between the fourth lens and the fifth lens along the optical axis is greater than each of the distance between the first lens and the second lens along the optical axis, the distance between the second lens and the third lens along the optical axis, the distance between the third lens and the fourth lens along the optical axis, and the distance between the fifth lens and the sixth lens along the optical axis.

15. The optical imaging system according to claim 13, wherein, The following conditional expression is satisfied: 0.2 ≤ D45 / Td ≤ 0.4, Wherein, D45 is the distance along the optical axis from the image side of the fourth lens to the object side of the fifth lens, and Td is the distance along the optical axis from the object side of the first lens to the image side of the sixth lens.

16. The optical imaging system according to claim 13, wherein, The following conditional expression is satisfied: 0.8 ≤ R1 / R5 ≤ 1.2 Wherein, R1 is the radius of curvature of the object side surface of the first lens at the optical axis, and R5 is the radius of curvature of the object side surface of the third lens at the optical axis.

17. The optical imaging system according to claim 13, wherein, The following conditional expression is satisfied: 0.2 ≤ (CT1+CT2+CT3+CT4) / f ≤ 0.5, Wherein, CT1 is the thickness of the first lens along the optical axis, CT2 is the thickness of the second lens along the optical axis, CT3 is the thickness of the third lens along the optical axis, CT4 is the thickness of the fourth lens along the optical axis, and f is the total focal length of the optical imaging system.

18. The optical imaging system according to claim 13, further comprising a light path changing member disposed on the object side of the first lens for changing the path of light. in, One or more of the first to the sixth lenses are D-shaped cut lenses.

19. The optical imaging system according to claim 13, wherein, The fifth lens has positive refractive power, and the sixth lens has negative refractive power.

20. The optical imaging system according to claim 13, wherein, The first lens is a D-shaped cut lens having a long axis and a short axis perpendicular to the long axis, and The following conditional expression is satisfied: 0.5 < AR1 < 1.0, Wherein, AR1 is equal to the aspect ratio of the maximum effective radius of the object side surface of the D-shaped cut lens along the major axis of the D-shaped cut lens to the maximum effective radius of the object side surface of the D-shaped cut lens along the minor axis of the D-shaped cut lens.

Images