Optical imaging system

Abstract

An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, arranged sequentially along the optical axis from the object side toward the imaging plane of the optical imaging system. The optical imaging system satisfies the condition 0.8≤TTL / f≤1.0, where TTL is the distance from the object-side surface of the first lens to the imaging plane, and f is the focal length of the optical imaging system.

Description

Technical Field

[0001] This application relates to an optical imaging system configured to fold an optical path. Prior Technology

[0002] In optical systems with multiple lenses arranged along the optical axis, the total length of the optical system generally increases with the number of lenses. For example, an optical imaging system with five lenses is more difficult to miniaturize than one with three lenses. For this reason, it is impossible to install a telephoto optical system with a long focal length in a thin, portable electronic device. Summary of the Invention

[0003] This summary is provided to introduce, in a simplified form, a series of concepts further elaborated in the embodiments below. This summary is not intended to identify key or essential features of the claimed object, nor is it intended to help determine the scope of the claimed object.

[0004] This invention provides an optical imaging system comprising: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The first lens has refractive power, the second lens has a convex object-side surface, the third lens has positive refractive power, the fourth lens has a convex image-side surface, and the fifth lens has a convex object-side surface. The first to fifth lenses are sequentially arranged along the optical axis from the object side towards the imaging plane. The total number of refractive lenses in the optical imaging system is five. The focal length of the first lens ranges from 7.0 mm to 18.0 mm. The optical imaging system satisfies the condition 0.8 ≤ TTL / f ≤ 1.0, where TTL is the distance from the object-side surface of the first lens to the imaging plane, and f is the focal length of the optical imaging system.

[0005] In one embodiment of the present invention, the first lens described above has a convex object-side surface.

[0006] In one embodiment of the present invention, the second lens described above has a concave image-side surface.

[0007] In one embodiment of the present invention, the third lens described above has a convex object-side surface.

[0008] In one embodiment of the present invention, the fourth lens described above has a concave object-side surface.

[0009] In an embodiment of the present invention, the above optical imaging system satisfies the following conditional expression: 2.8 ≤ f-number, where the f-number is the aperture value of the optical imaging system.

[0010] In an embodiment of the present invention, the above fifth lens has a concave image-side surface.

[0011] In an embodiment of the present invention, the above optical imaging system satisfies the following conditional expression:

[0012] In an embodiment of the present invention, the above fifth lens has a concave image-side surface.

[0013] In an embodiment of the present invention, the above optical imaging system satisfies the following conditional expression: 0 ≤ D12 / f ≤ 0.05; where D12 is the distance along the optical axis from the image-side surface of the first lens to the object-side surface of the second lens.

[0014] In an embodiment of the present invention, the above optical imaging system satisfies the following conditional expression: 0.2 ≤ L1R1 / f ≤ 0.3; where L1R1 is the radius of curvature of the object-side surface of the first lens.

[0015] The present invention further provides an optical imaging system including: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, where the first lens includes refractive power, the second lens includes a concave object-side surface, the third lens includes positive refractive power, the fourth lens includes a convex image-side surface, and the fifth lens includes a concave object-side surface and a convex image-side surface. The first lens to the fifth lens are sequentially arranged along the optical axis from the object side toward the imaging plane, the total number of lenses with refractive power in the optical imaging system is five, the focal length range of the first lens is 7.0 mm to 18.0 mm, and the optical imaging system satisfies the following conditional expressions: 0.8 ≤ TTL / f ≤ 1.0 and 0 mm < f1 + f2 < 32 mm, where TTL is the distance from the object-side surface of the first lens to the imaging plane, f is the focal length of the optical imaging system, f1 is the focal length of the first lens, and f2 is the focal length of the second lens.

[0016] In an embodiment of the present invention, the above optical imaging system satisfies the following conditional expression: 3.2 < Nd2 + Nd3; where Nd2 is the refractive index of the second lens and Nd3 is the refractive index of the third lens.

[0017] In one embodiment of the present invention, the optical imaging system described above satisfies the following conditional expression: 0≤D12 / f≤0.05; where D12 is the distance along the optical axis from the image-side surface of the first lens to the object-side surface of the second lens.

[0018] In one embodiment of the present invention, the optical imaging system described above satisfies the following condition: 0.2≤L1R1 / f≤0.3; where L1R1 is the radius of curvature of the object-side surface of the first lens.

[0019] In one embodiment of the present invention, the fifth lens described above has a negative refractive power.

[0020] Other features and characteristics will become apparent from reading the following detailed description, drawings and claims. Simple Explanation of the Diagram

[0021] Figure 1 is a configuration diagram of a first example of an optical imaging system. Figure 2 shows the aberration curve of the optical imaging system shown in Figure 1. Figure 3 is a configuration diagram of a second example of an optical imaging system. Figure 4 shows the aberration curves of the optical imaging system shown in Figure 3. Figure 5 is a configuration diagram of the third example of the optical imaging system. Figure 6 shows the aberration curves of the optical imaging system shown in Figure 5. Figure 7 is a configuration diagram of the fourth example of the optical imaging system. Figure 8 shows the aberration curves of the optical imaging system shown in Figure 7. Figure 9 is a configuration diagram of the fifth example of an optical imaging system. Figure 10 shows the aberration curves of the optical imaging system shown in Figure 9. Figure 11 is a configuration diagram of the sixth example of an optical imaging system. Figure 12 shows the aberration curves of the optical imaging system shown in Figure 11. Figure 13 is a configuration diagram of the seventh example of an optical imaging system. Figure 14 shows the aberration curves of the optical imaging system shown in Figure 13. Figure 15 is a configuration diagram of the eighth example of an optical imaging system. Figure 16 shows the aberration curves of the optical imaging system shown in Figure 15. Figure 17 is a configuration diagram of the ninth example of an optical imaging system. Figure 18 shows the aberration curves of the optical imaging system shown in Figure 17. Figure 19 is a configuration diagram of the tenth example of an optical imaging system. Figure 20 shows the aberration curves of the optical imaging system shown in Figure 19. Figure 21 is a configuration diagram of the eleventh example of an optical imaging system. Figure 22 shows the aberration curves of the optical imaging system shown in Figure 21. Figure 23 is a plan view of an example of the first lens in an optical imaging system when viewed along the optical axis. Figure 24 is a plan view of an example of a gap-maintaining member disposed between the first lens and the second lens in an optical imaging system when viewed in the direction of the optical axis. Figures 25 to 28 are rear views of a portable electronic device equipped with multiple optical imaging systems. Implementation

[0022] The following detailed description is provided to assist the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various modifications, refinements, and equivalents of the methods, apparatus, and / or systems described herein will become apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not intended to limit the reader to the order of operations described herein, but as will become apparent after understanding the disclosure of this application, changes may be made except for operations that must be performed in a specific order. Furthermore, for clarity and brevity, descriptions of known functions and structures in this art may be omitted.

[0023] The features described herein may be implemented in various forms and are not to be construed as 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, apparatus, and / or systems described herein will become apparent upon understanding the disclosure of this application.

[0024] In this document, the term "may" (e.g., what an instance or embodiment may include or implement) is used with respect to an example or embodiment to mean that there is at least one instance or embodiment that includes or implements such a feature, but not all instances and embodiments are limited thereto.

[0025] Throughout the specification, when an element such as a layer, region, or substrate is described as being "on," "connected to," or "coupled to" another element, the element may be directly "on," directly "connected to," or directly "coupled to" the other element, or there may be one or more other elements in between. Conversely, when an element is described as being "directly on," "directly connected to," or "directly coupled to" another element, there may be no other elements in between.

[0026] The term "and / or" as used in this document includes any one of the relevant listed items or any combination of any two or more of the relevant listed items.

[0027] Although terms such as "first," "second," and "third" may be used in this text to describe various elements, these elements are not limited by these terms. Rather, these terms are only used to distinguish individual elements. Therefore, without departing from the teaching content of the examples, the first element mentioned in the examples described herein may also be referred to as the second element.

[0028] In this document, for ease of explanation, spatially relative terms such as "above," "upper," "below," and "lower" are used to describe the relationship of one element relative to another shown in the figures. These spatially relative terms are intended to encompass not only the orientation depicted in the figures but also different orientations of the device during use or operation. For example, if the device in the figure is rotated, an element described as being "above" or "upper" relative to another element will now be described as being "below" or "lower" relative to that other element. Therefore, the term "above" encompasses both upper and lower orientations depending on the spatial orientation of the device. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein will be interpreted accordingly.

[0029] The terminology used herein is for illustrative purposes only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the articles "a" and "the" are intended to include the plural form as well. The terms "comprises," "includes," and "has" specify the presence of the stated features, numbers, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, components, elements, and / or combinations thereof.

[0030] Due to manufacturing techniques and / or tolerances, the shapes shown in the drawings may vary. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings, but include shape variations that occur during manufacturing.

[0031] As will be apparent upon understanding the disclosure of this application, the features of the examples described herein can be combined in various ways. Furthermore, as will be apparent upon understanding the disclosure of this application, although the examples described herein have multiple configurations, other configurations may exist.

[0032] The first lens is the lens closest to the object (or subject), and the fifth or sixth lens (if present) is the lens closest to the imaging plane (or image sensor).

[0033] The radius of curvature, the thickness of the lens and other components, the distance between the lens and other components, the focal length, PTTL, TTL, BFL, IMG_HT, 2IMG_HT, L1R1eMax, L1R2eMax, L1S1el, L1S1es, L1S2el, L1S2es, L2S1el, L2S1es, L2S2el, and L2S2es are expressed in millimeters (mm). These quantities will be defined later in this application.

[0034] The thickness of the lens and other components, the distance between the lens and other components, PTTL, TTL, and BFL are measured along the optical axis of the optical imaging system.

[0035] Unless otherwise stated, references to the shape of a lens surface refer to the shape of the paraxial region of the lens surface. The paraxial region of a lens surface is the central portion of the lens surface surrounding the optical axis of the lens surface, wherein light rays incident on the lens surface make a small angle θ with the optical axis, and the approximations sin θ ≈ θ, tan θ ≈ θ, and cos θ ≈ 1 are valid.

[0036] For example, the statement that the object-side surface of a lens is convex means that at least the paraxial region of the object-side surface of the lens is convex, and the statement that the image-side surface of a lens is concave means that at least the paraxial region of the image-side surface of the lens is concave. Therefore, even if the object-side surface of a lens can be described as convex, the entire object-side surface of the lens may not be convex, and the peripheral region of the object-side surface of the lens may be concave. Furthermore, even if the image-side surface of a lens can be described as concave, the entire image-side surface of the lens may not be concave, and the peripheral region of the image-side surface of the lens may be convex.

[0037] An optical imaging system includes an optical system comprising multiple lenses. For example, the optical system includes multiple lenses, each possessing refractive power. However, the optical imaging system is not limited to lenses with refractive power. For example, the optical imaging system may include a prism for reflecting incident light and an aperture for adjusting the amount of incident light. Additionally, the optical imaging system may include an infrared blocking filter for blocking infrared light. Furthermore, the optical imaging system may further include an image sensor (e.g., an imaging device) for converting an image of an object incident through the optical system into an electrical signal. Additionally, the optical imaging system may further include a gap maintaining member for maintaining the distance between two lenses.

[0038] The lenses are made of a material with a refractive index different from that of air. For example, the lenses may be made of plastic or glass.

[0039] At least one surface of at least one of the lenses may have an aspherical shape. The aspherical surface of the lens is expressed by the following Equation 1. (1)

[0040] In Equation 1, c is the curvature of the lens surface and is the reciprocal of the radius of curvature of the lens surface at the optical axis of the lens surface, k is the conic constant, r is the distance from any point on the lens surface to the optical axis of the lens surface in the direction perpendicular to the optical axis of the lens surface, A to J are aspherical constants, and Z (also called sag) is the distance from a point on the lens surface at a distance r from the optical axis of the lens surface in the direction parallel to the optical axis of the lens surface to a tangential plane perpendicular to the optical axis and intersecting the vertex of the lens surface.

[0041] The optical imaging system includes five or more lenses. For example, the optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in ascending numerical order from a first lens to a fifth lens, wherein the first lens is closest to the object and the fifth lens is closest to the imaging plane. Alternatively, the optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in ascending numerical order from a first lens to a sixth lens, wherein the first lens is closest to the object and the sixth lens is closest to the imaging plane.

[0042] Each of the first through fifth or sixth lenses may be spaced apart from the other. For example, the image-side surface of the first lens does not contact the object-side surface of the second lens, and the image-side surface of the second lens does not contact the object-side surface of the third lens.

[0043] The first lens has a predetermined refractive power. For example, the first lens may have a positive refractive power. The first lens has a convex surface. For example, the first lens may have a convex object-side surface. The first lens has a predetermined refractive index. For example, the first lens may have a refractive index of less than 1.6. The first lens has a predetermined focal length. For example, the focal length of the first lens may be determined to be in the range of 7.0 mm to 18.0 mm.

[0044] The second lens has a predetermined refractive power. For example, the second lens may have a positive or negative refractive power. The second lens has a concave surface. For example, the second lens may have either a concave object-side surface or a concave image-side surface, or both. Alternatively, if there are six lenses, the second lens has a convex surface. For example, the second lens may have a convex object-side surface and a convex image-side surface. The second lens has a predetermined refractive index. For example, the second lens may have a refractive index of 1.6 or greater than 1.6 and less than 1.8. Alternatively, if there are six lenses, the second lens may have a refractive index of 1.5 or greater than 1.5 and less than 1.8.

[0045] The third lens has a predetermined refractive power. For example, the third lens may have a positive or negative refractive power. The third lens has a convex surface. For example, the third lens may have a convex object-side surface or a convex image-side surface. The third lens has a predetermined refractive index. For example, the third lens may have a refractive index of 1.6 or greater than 1.6 and 2.0 or less than 2.0.

[0046] The fourth lens has a predetermined refractive power. For example, the fourth lens may have a positive or negative refractive power. The fourth lens has a convex surface. For example, the fourth lens may have a convex image-side surface. The fourth lens has a predetermined refractive index. For example, the fourth lens may have a refractive index of 1.6 or greater than 1.6 and less than 1.8.

[0047] The fifth lens has a predetermined refractive power. For example, the fifth lens may have a positive or negative refractive power. The fifth lens has a concave surface. For example, the fifth lens may have a concave object-side surface or a concave image-side surface. The fifth lens has a predetermined refractive index. For example, the fifth lens may have a refractive index of 1.5 or greater than 1.5 and less than 1.8.

[0048] The sixth lens has a predetermined refractive power. For example, the sixth lens may have a positive refractive power. The sixth lens has a convex surface. For example, the sixth lens may have a convex image-side surface. The sixth lens has a predetermined refractive index. For example, the third lens may have a refractive index of 1.0 or greater than 1.0 and 1.6 or less than 1.6.

[0049] One or more of the first to sixth lenses may have the following shape: in the shape, the effective radius or diameter of the lens in a first direction intersecting the optical axis is different from the effective radius or diameter of the lens in a second direction intersecting the optical axis and perpendicular to the first direction.

[0050] The optical imaging system may include lenses made of plastic. For example, at least one of the five or six lenses of the optical imaging system may be made of plastic material.

[0051] The optical imaging system may include aspherical lenses. For example, at least one of the five or six lenses in the optical imaging system may be an aspherical lens.

[0052] The optical imaging system may include optical elements configured to fold an optical path within the system. For example, the optical imaging system may include a prism configured to reflect light. The prism may be disposed on the object side of a first lens. The prism may be made of a material having a relatively low Abbe number. For example, the prism may be made of a material having an Abbe number of 60 or less.

[0053] The optical imaging system includes filters and image sensors, and may include an aperture stop.

[0054] A filter is positioned between the image sensor and the lens closest to the imaging plane. The filter blocks a certain wavelength range of incident light to improve the resolution of the optical imaging system. For example, the filter can block the infrared wavelengths of the incident light.

[0055] The optical imaging system includes a gap-maintaining component.

[0056] A gap-maintaining member is disposed between two lenses to maintain the distance between the two lenses. For example, the gap-maintaining member may be disposed between a first lens and a second lens. A hole is formed in the gap-maintaining member. The hole may have a shape having a major axis and a minor axis. For example, the hole may be elliptical, rectangular with rounded corners, or any other shape having a major axis and a minor axis. The length of the hole in the minor axis direction may be 0.8 times or greater than 0.8 times but less than 1.0 times the length of the hole in the major axis direction.

[0057] The optical imaging system may satisfy any one or more of the following conditional expressions 1 to 9. 2.8 ≤ f_number (conditional expression 1) 3.2 < Nd2 + Nd3 (Conditional expression 2) 0 mm < f1 + f2 < 32 mm (Conditional expression 3) 0 ≤ D12 / f ≤ 0.05 (Conditional expression 4) 0.5 < L1R2eMax / IMG_HT < 2.2 (Conditional expression 5) 0.8 < L1R2eMax / L1R1eMax < 1.0 (Conditional expression 6) 0.8 ≤ TTL / f ≤ 1.0 (Conditional expression 7) 11 ≤ TTL / IMG_HT (conditional expression 8) 0.2 ≤ L1R1 / f ≤ 0.3 (Conditional expression 9)

[0058] In the above conditional expressions 1 to 9, f is the aperture value of the optical imaging system, and is equal to the focal length f of the optical imaging system divided by the entrance pupil diameter of the optical imaging system; Nd2 is the refractive index of the second lens; Nd3 is the refractive index of the third lens; f1 is the focal length of the first lens; f2 is the focal length of the second lens; D12 is the distance along the optical axis from the image-side surface of the first lens to the object-side surface of the second lens; f is the focal length of the optical imaging system; L1R1eMax is the maximum effective radius of the object-side surface of the first lens; L1R2eMax is the maximum effective radius of the image-side surface of the first lens; TTL is the distance along the optical axis from the object-side surface of the first lens to the imaging plane; IMG_HT is half the diagonal length of the imaging plane; and L1R1 is the radius of curvature of the object-side surface of the first lens.

[0059] In addition, the optical imaging system may further satisfy any one or any two or more of the following conditional expressions 10 to 25. 0.65 < L1S1es / L1S1el < 1.0 (Conditional expression 10) 0.80 < L1S2es / L1S2el < 1.0 (Conditional expression 11) 0.85 < L2S1es / L2S1el < 1.0 (Conditional expression 12) 0.65 < L2S2es / L2S2el < 1.0 (Conditional expression 13) 8.0 mm < DPL1 < 12.0 mm (Conditional expression 14) 40 mm < PTTL < 70 mm (Conditional expression 15) 0.8 < SPY2 / SPX2 < 1.0 (Conditional expression 16) 1.5 < L1S1el / IMG_HT < 2.2 (Conditional expression 17) 0.09 < L1S1el / PTTL < 0.13 (Conditional expression 18) 0.07 < L1S1es / PTTL < 0.12 (Conditional expression 19) 0.06 < L2S1el / PTTL < 0.11 (Conditional expression 20) 0.06 < L2S1es / PTTL < 0.10 (Conditional expression 21) 0.02 < AL1 / (PTTL) [, 2 , ]< 0.05 (Conditional expression 22) 10° < 2θ < 92° (Conditional expression 23) 1.0 < 2θ / FOV < 10 (Conditional expression 24) 2 < BFL / 2IMG_HT < 5 (Conditional expression 25)

[0060] In the above conditional expressions 10 to 25, L1S1es is the effective radius of the minor axis of the object-side surface of the first lens, L1S1el is the effective radius of the major axis of the object-side surface of the first lens (and is the same as L1R1eMax in conditional expression 6), L1S2es is the effective radius of the minor axis of the image-side surface of the first lens, L1S2el is the effective radius of the major axis of the image-side surface of the first lens (and is the same as L1R2eMax in conditional expressions 5 and 6), L2S1es is the effective radius of the minor axis of the object-side surface of the second lens, L2S1el is the effective radius of the major axis of the object-side surface of the second lens, L2S2es is the effective radius of the minor axis of the image-side surface of the second lens, and L2S2el is the effective radius of the major axis of the image-side surface of the second lens.

[0061] DPL1 is the distance along the optical axis from the image-side surface of the prism on the object side of the first lens to the object-side surface of the first lens, and PTTL is the distance along the optical axis from the reflecting surface of the prism on the object side of the first lens to the imaging plane.

[0062] SPY2 is the length of the hole in the clearance maintaining member along the minor axis, and SPX2 is the length of the hole in the clearance maintaining member along the major axis.

[0063] IMG_HT is half the length of the diagonal of the imaging plane.

[0064] AL1 is the area of ​​the object-side surface of the optical portion of the first lens projected onto a plane perpendicular to the optical axis. The optical portion of the object-side surface of the first lens is the part of the object-side surface that exhibits the lens characteristics of the first lens. When viewed along the optical axis, the first lens has a non-circular shape and includes two arcuate side surfaces and two straight side surfaces connecting the two arcuate side surfaces to each other. 2θ is the angle with a vertex on the optical axis of the first lens and opposite to one of the straight side surfaces.

[0065] FOV is the total angle of view or total field of view of the optical imaging system, BFL is the distance along the optical axis from the image-side surface of the lens closest to the imaging plane (i.e., the fifth or sixth lens) to the imaging plane, and 2IMG_HT is the diagonal length of the imaging plane.

[0066] The first through eleventh examples of optical imaging systems will be described below.

[0067] Figure 1 is a configuration diagram of a first example of an optical imaging system, and Figure 2 shows the aberration curves of the optical imaging system shown in Figure 1.

[0068] The optical imaging system 100 includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, and a fifth lens 150.

[0069] The first lens 110 has positive refractive power. The first lens 110 has a convex object-side surface and a convex image-side surface. The second lens 120 has negative refractive power. The second lens 120 has a convex object-side surface and a concave image-side surface. The third lens 130 has positive refractive power. The third lens 130 has a convex object-side surface and a convex image-side surface. The fourth lens 140 has negative refractive power. The fourth lens 140 has a concave object-side surface and a convex image-side surface. The fifth lens 150 has positive refractive power. The fifth lens 150 has a convex object-side surface and a concave image-side surface.

[0070] The optical imaging system 100 includes a prism P, a filter 170, and an image sensor 180.

[0071] The optical imaging system 100 includes a prism P as a tool for folding the optical path of light within the optical imaging system 100. The prism P folds a first optical axis C1 to form a second optical axis C2. The second optical axis C2 is substantially perpendicular to the first optical axis C1. The prism P is disposed on the object side of a first lens 110 and reflects light reflected from an object to an image sensor 180.

[0072] A filter 170 is positioned in front of the image sensor 180 and blocks infrared radiation contained in the incident light. The image sensor 180 includes multiple optical sensors and is configured to convert optical signals into electrical signals.

[0073] Table 1 below shows the optical characteristics of the components of the optical imaging system 100, and Table 2 below shows the aspherical surface coefficients of the lenses of the optical imaging system 100. Table 1 Surface number element radius of curvature Thickness / Distance Refractive index Abbe number Effective radius of major axis effective radius of minor axis 0 object infinity infinity 1 Prism infinity 6.000 1.519 64.2 2 infinity 6.000 1.519 64.2 3 infinity 9.000 4 First lens 6.72 4.000 1.537 55.7 5.380 4.909 5 -57.85 0.393 4.748 4.401 6 Second lens 13.11 0.300 1.621 26.0 4.379 4.158 7 3.96 1.237 3.822 3.708 8 Third lens 10.57 1.317 1.680 19.2 3.705 3.653 9 -62.18 0.356 3.673 3.628 10 Fourth lens -5.15 0.303 1.642 23.9 3.595 3.595 11 -25.18 2.028 3.562 3.505 12 Fifth lens 6.60 0.817 1.571 37.4 3.667 3.590 13 17.00 1.020 3.707 3.616 14 filter infinity 0.110 1.519 64.2 3.648 15 infinity 18.304 3.645 16 Imaging plane infinity 0.000 Table 2 Surface number k A B C D E F G H J 4 [-]9.4E [-]01 2.7E [-]04 3.2E [-]05 [-]7.2E [-]06 7.3E [-]07 [-]2.3E [-]08 [-]1.2E [-]09 1.2E [-]10 [-]3.6E [-]12 3.7E [-]14 5 0.0E+00 2.9E [-]03 [-]1.4E [-]03 2.8E [-]04 [-]3.1E [-]05 1.9E [-]06 [-]7.0E [-]08 1.4E [-]09 [-]1.3E [-]11 4.6E [-]14 6 0.0E+00 [-]6.3E [-]03 5.2E [-]04 1.8E [-]05 [-]9.6E [-]06 1.1E [-]06 [-]7.4E [-]08 3.3E [-]09 [-]9.6E [-]11 1.3E [-]12 7 0.0E+00 [-]1.4E [-]02 3.0E [-]03 [-]5.0E [-]04 3.6E [-]05 1.1E [-]06 [-]4.3E [-]07 3.5E [-]08 [-]1.2E [-]09 1.5E [-]11 8 0.0E+00 [-]7.5E [-]03 6.7E [-]04 5.6E [-]05 [-]2.8E [-]05 4.8E [-]06 [-]5.3E [-]07 4.1E [-]08 [-]1.9E [-]09 4.0E [-]11 9 0.0E+00 [-]5.2E [-]03 [-]2.3E [-]03 1.5E [-]03 [-]3.8E [-]04 5.3E [-]05 [-]4.4E [-]06 2.1E [-]07 [-]4.8E [-]09 4.0E [-]11 10 0.0E+00 3.0E [-]03 1.2E [-]03 [-]4.3E [-]04 1.0E [-]04 [-]1.8E [-]05 2.3E [-]06 [-]1.8E [-]07 7.7E [-]09 [-]1.4E [-]10 11 0.0E+00 [-]4.7E [-]03 4.8E [-]03 [-]2.1E [-]03 5.3E [-]04 [-]8.3E [-]05 8.1E [-]06 [-]4.9E [-]07 1.7E [-]08 [-]2.4E [-]10 12 0.0E+00 [-]1.1E [-]02 5.1E [-]04 [-]1.1E [-]04 6.4E [-]05 [-]1.4E [-]05 1.5E [-]06 [-]1.0E [-]07 3.8E [-]09 [-]6.2E [-]01 13 0.0E+00 [-]6.8E [-]03 [-]1.2E [-]04 1.2E [-]04 [-]1.2E [-]05 3.8E [-]07 1.1E [-]08 [-]1.7E [-]09 1.1E [-]10 [-]3.5E [-]12

[0074] Figure 3 is a configuration diagram of a second example of an optical imaging system, and Figure 4 shows the aberration curves of the optical imaging system shown in Figure 3.

[0075] The optical imaging system 200 includes a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, and a fifth lens 250.

[0076] The first lens 210 has positive refractive power. The first lens 210 has a convex object-side surface and a convex image-side surface. The second lens 220 has negative refractive power. The second lens 220 has a convex object-side surface and a concave image-side surface. The third lens 230 has positive refractive power. The third lens 230 has a convex object-side surface and a convex image-side surface. The fourth lens 240 has negative refractive power. The fourth lens 240 has a concave object-side surface and a convex image-side surface. The fifth lens 250 has positive refractive power. The fifth lens 250 has a concave object-side surface and a convex image-side surface.

[0077] The optical imaging system 200 further includes a prism P, a filter 270, and an image sensor 280.

[0078] The optical imaging system 200 includes a prism P as a tool for folding the optical path of light within the optical imaging system 200. The prism P folds a first optical axis C1 to form a second optical axis C2. The second optical axis C2 is substantially perpendicular to the first optical axis C1. The prism P is disposed on the object side of the first lens 210 and reflects light reflected from the object to the image sensor 280.

[0079] A filter 270 is positioned in front of the image sensor 280 and blocks infrared radiation contained in the incident light. The image sensor 280 includes multiple optical sensors and is configured to convert optical signals into electrical signals.

[0080] Table 3 below shows the optical characteristics of the optical imaging system 200, and Table 4 below shows the aspherical surface coefficients of the lenses of the optical imaging system 200. Table 3 Surface number element radius of curvature Thickness / Distance Refractive index Abbe number Effective radius of major axis effective radius of minor axis 0 object infinity infinity 1 Prism infinity 6.000 1.519 64.2 2 infinity 6.000 1.519 64.2 3 infinity 9.000 4 First lens 7.08 4.012 1.537 55.7 5.380 4.763 5 -16.42 0.444 4.748 4.341 6 Second lens 25.05 0.300 1.621 26.0 4.379 3.991 7 3.98 1.323 3.822 3.563 8 Third lens 11.83 1.945 1.680 19.2 3.705 3.527 9 -25.38 0.470 3.673 3.586 10 Fourth lens -4.56 0.335 1.642 23.9 3.595 3.557 11 -11.87 0.095 3.562 3.590 12 Fifth lens -6.69 0.700 1.571 37.4 3.707 3.581 13 -4.87 1.020 3.667 3.562 14 filter infinity 0.110 1.519 64.2 3.470 15 infinity 18.696 3.465 16 Imaging plane infinity 0.000 Table 4 Surface number k A B C D E F G H J 4 [-]1.1E+00 9.1E [-]05 4.1E [-]05 [-]1.3E [-]05 2.3E [-]06 [-]2.2E [-]07 1.2E [-]08 [-]4.0E [-]10 7.0E [-]12 [-]5.1E [-]14 5 0.0E+00 2.5E [-]03 [-]1.6E [-]03 4.3E [-]04 [-]6.4E [-]05 5.7E [-]06 [-]3.2E [-]07 1.1E [-]08 [-]2.0E [-]10 1.6E [-]12 6 0.0E+00 [-]2.9E [-]03 [-]2.2E [-]03 1.0E [-]03 [-]2.1E [-]04 2.4E [-]05 [-]1.7E [-]06 6.9E [-]08 [-]1.6E [-]09 1.6E [-]11 7 0.0E+00 [-]8.4E [-]03 [-]9.2E [-]04 9.1E [-]04 [-]2.6E [-]04 4.2E [-]05 [-]4.2E [-]06 2.6E [-]07 [-]8.9E [-]09 1.3E [-]10 8 0.0E+00 [-]5.7E [-]03 [-]6.7E [-]04 6.5E [-]04 [-]2.3E [-]04 4.7E [-]05 [-]6.1E [-]06 4.6E [-]07 [-]1.9E [-]08 3.3E [-]10 9 0.0E+00 [-]5.2E [-]03 [-]9.2E [-]04 5.3E [-]04 [-]1.2E [-]04 1.8E [-]05 [-]2.0E [-]06 1.5E [-]07 [-]6.1E [-]09 1.0E [-]10 10 0.0E+00 3.0E [-]03 [-]3.4E [-]04 8.0E [-]04 [-]3.6E [-]04 8.0E [-]05 [-]1.0E [-]05 7.5E [-]07 [-]2.9E [-]08 4.8E [-]10 11 0.0E+00 4.5E [-]03 [-]9.7E [-]03 6.4E [-]03 [-]2.1E [-]03 3.9E [-]04 [-]4.3E [-]05 2.9E [-]06 [-]1.0E [-]07 1.6E [-]09 12 0.0E+00 1.7E [-]02 [-]1.4E [-]02 7.5E [-]03 [-]2.1E [-]03 3.7E [-]04 [-]3.8E [-]05 2.4E [-]06 [-]8.5E [-]08 1.3E [-]09 13 0.0E+00 1.2E [-]02 [-]1.7E [-]03 3.1E [-]04 1.1E [-]05 [-]1.7E [-]05 3.0E [-]06 [-]2.4E [-]07 9.7E [-]09 [-]1.5E [-]10

[0081] Figure 5 is a configuration diagram of a third example of an optical imaging system, and Figure 6 shows the aberration curves of the optical imaging system shown in Figure 5.

[0082] The optical imaging system 300 includes a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, and a fifth lens 350.

[0083] The first lens 310 has positive refractive power. The first lens 310 has a convex object-side surface and a convex image-side surface. The second lens 320 has negative refractive power. The second lens 320 has a convex object-side surface and a concave image-side surface. The third lens 330 has positive refractive power. The third lens 330 has a convex object-side surface and a convex image-side surface. The fourth lens 340 has negative refractive power. The fourth lens 340 has a concave object-side surface and a convex image-side surface. The fifth lens 350 has negative refractive power. The fifth lens 350 has a concave object-side surface and a convex image-side surface.

[0084] The optical imaging system 300 further includes a prism P, a filter 370, and an image sensor 380.

[0085] The optical imaging system 300 includes a prism P as a tool for folding the optical path of light within the optical imaging system 300. The prism P folds a first optical axis C1 to form a second optical axis C2. The second optical axis C2 is substantially perpendicular to the first optical axis C1. The prism P is disposed on the object side of the first lens 310 and reflects light reflected from the object to the image sensor 380.

[0086] A filter 370 is positioned in front of the image sensor 380 and blocks infrared radiation contained in the incident light. The image sensor 380 includes multiple optical sensors and is configured to convert optical signals into electrical signals.

[0087] Table 5 below shows the optical characteristics of the components of the optical imaging system 300, and Table 6 below shows the aspherical surface coefficients of the lenses of the optical imaging system 300. Table 5 Surface number element radius of curvature Thickness / Distance Refractive index Abbe number Effective radius of major axis effective radius of minor axis 0 object infinity infinity 1 Prism infinity 6.000 1.519 64.2 2 infinity 6.000 1.519 64.2 3 infinity 9.000 4 First lens 6.94 3.581 1.537 55.7 5.380 4.609 5 -11.99 0.516 4.748 4.326 6 Second lens 81.24 0.350 1.621 26.0 4.379 3.879 7 4.14 0.998 3.822 3.516 8 Third lens 11.54 2.304 1.680 19.2 3.705 3.467 9 -51.24 0.558 3.673 3.411 10 Fourth lens -4.73 0.600 1.642 23.9 3.595 3.376 11 -6.66 0.163 3.562 3.366 12 Fifth lens -4.66 0.700 1.571 37.4 3.707 3.329 13 -5.18 1.020 3.667 3.310 14 filter infinity 0.110 1.519 64.2 15 infinity 19.009 16 Imaging plane infinity 0.000 Table 6 Surface number k A B C D E F G H J 4 [-]1.2E+00 [-]6.6E [-]05 4.5E [-]05 [-]8.4E [-]06 1.3E [-]06 [-]1.3E [-]07 7.7E [-]09 [-]2.6E [-]10 4.5E [-]12 [-]3.2E [-]14 5 0.0E+00 1.1E [-]03 [-]5.8E [-]04 1.6E [-]04 [-]2.3E [-]05 2.0E [-]06 [-]1.1E [-]07 3.6E [-]09 [-]6.7E [-]11 5.3E [-]13 6 0.0E+00 [-]5.3E [-]03 6.6E [-]04 [-]3.1E [-]05 [-]1.2E [-]05 2.8E [-]06 [-]2.7E [-]07 1.4E [-]08 [-]3.7E [-]10 4.1E [-]12 7 0.0E+00 [-]7.8E [-]03 [-]2.3E [-]03 1.7E [-]03 [-]5.1E [-]04 8.4E [-]05 [-]8.2E [-]06 4.7E [-]07 [-]1.5E [-]08 2.0E [-]10 8 0.0E+00 [-]3.6E [-]04 [-]7.6E [-]03 3.9E [-]03 [-]1.0E [-]03 1.5E [-]04 [-]1.4E [-]05 8.3E [-]07 [-]2.6E [-]08 3.6E [-]10 9 0.0E+00 1.3E [-]03 [-]9.1E [-]03 4.7E [-]03 [-]1.3E [-]03 2.0E [-]04 [-]2.0E [-]05 1.2E [-]06 [-]4.2E [-]08 6.1E [-]10 10 0.0E+00 2.4E [-]03 3.1E [-]03 [-]2.0E [-]03 6.6E [-]04 [-]1.2E [-]04 1.3E [-]05 [-]7.9E [-]07 2.7E [-]08 [-]3.8E [-]10 11 0.0E+00 [-]1.3E [-]02 1.4E [-]02 [-]6.7E [-]03 1.9E [-]03 [-]3.3E [-]04 3.6E [-]05 [-]2.4E [-]06 8.7E [-]08 [-]1.3E [-]09 12 0.0E+00 1.3E [-]02 [-]8.1E [-]03 4.0E [-]03 [-]1.1E [-]03 1.6E [-]04 [-]1.3E [-]05 6.5E [-]07 [-]1.5E [-]08 1.3E [-]10 13 0.0E+00 2.2E [-]02 [-]1.3E [-]02 5.8E [-]03 [-]1.6E [-]03 2.5E [-]04 [-]2.5E [-]05 1.5E [-]06 [-]5.2E [-]08 7.6E [-]10

[0088] Figure 7 is a configuration diagram of a fourth example of an optical imaging system, and Figure 8 shows the aberration curves of the optical imaging system shown in Figure 7.

[0089] The optical imaging system 400 includes a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, and a fifth lens 450.

[0090] The first lens 410 has positive refractive power. The first lens 410 has a convex object-side surface and a convex image-side surface. The second lens 420 has negative refractive power. The second lens 420 has a concave object-side surface and a convex image-side surface. The third lens 430 has positive refractive power. The third lens 430 has a convex object-side surface and a convex image-side surface. The fourth lens 440 has negative refractive power. The fourth lens 440 has a concave object-side surface and a convex image-side surface. The fifth lens 450 has negative refractive power. The fifth lens 450 has a concave object-side surface and a convex image-side surface.

[0091] The optical imaging system 400 includes a prism P, a filter 470, and an image sensor 480.

[0092] The optical imaging system 400 includes a prism P as a tool for folding the optical path of light within the optical imaging system 400. The prism P folds a first optical axis C1 to form a second optical axis C2. The second optical axis C2 is substantially perpendicular to the first optical axis C1. The prism P is disposed on the object side of the first lens 410 and reflects light reflected from the object to the image sensor 480.

[0093] A filter 470 is positioned in front of the image sensor 480 and blocks infrared radiation contained in the incident light. The image sensor 480 includes multiple optical sensors and is configured to convert optical signals into electrical signals.

[0094] Table 7 below shows the optical characteristics of the components of the optical imaging system 400, and Table 8 below shows the aspherical surface coefficients of the lenses of the optical imaging system 400. Table 7 Surface number element radius of curvature Thickness / Distance Refractive index Abbe number Effective radius of major axis effective radius of minor axis 0 object infinity infinity 1 Prism infinity 6.000 1.519 64.2 2 infinity 6.000 1.519 64.2 3 infinity 9.000 4 First lens 7.85 4.250 1.537 55.7 4.400 4.377 5 -9.42 0.648 3.989 3.974 6 Second lens -4.04 0.350 1.621 26.0 3.731 3.725 7 -32.62 0.578 3.432 3.432 8 Third lens 33.46 1.365 1.680 19.2 3.416 3.416 9 -15.45 0.591 3.514 3.514 10 Fourth lens -4.29 0.600 1.642 23.9 3.500 3.500 11 -5.65 0.025 3.660 3.645 12 Fifth lens -6.21 0.700 1.571 37.4 3.515 3.467 13 -6.90 1.020 3.432 3.358 14 filter infinity 0.110 1.519 64.2 15 infinity 19.474 16 Imaging plane infinity 0.000 Table 8 Surface number k A B C D E F G H J 4 [-]1.2E+00 [-]6.6E [-]05 4.5E [-]05 [-]8.4E [-]06 1.3E [-]06 [-]1.3E [-]07 7.7E [-]09 [-]2.6E [-]10 4.5E [-]12 [-]3.2E [-]14 5 0.0E+00 1.1E [-]03 [-]5.8E [-]04 1.6E [-]04 [-]2.3E [-]05 2.0E [-]06 [-]1.1E [-]07 3.6E [-]09 [-]6.7E [-]11 5.3E [-]13 6 0.0E+00 [-]5.3E [-]03 6.6E [-]04 [-]3.1E [-]05 [-]1.2E [-]05 2.8E [-]06 [-]2.7E [-]07 1.4E [-]08 [-]3.7E [-]10 4.1E [-]12 7 0.0E+00 [-]7.8E [-]03 [-]2.3E [-]03 1.7E [-]03 [-]5.1E [-]04 8.4E [-]05 [-]8.2E [-]06 4.7E [-]07 [-]1.5E [-]08 2.0E [-]10 8 0.0E+00 [-]3.6E [-]04 [-]7.6E [-]03 3.9E [-]03 [-]1.0E [-]03 1.5E [-]04 [-]1.4E [-]05 8.3E [-]07 [-]2.6E [-]08 3.6E [-]10 9 0.0E+00 1.3E [-]03 [-]9.1E [-]03 4.7E [-]03 [-]1.3E [-]03 2.0E [-]04 [-]2.0E [-]05 1.2E [-]06 [-]4.2E [-]08 6.1E [-]10 10 0.0E+00 2.4E [-]03 3.1E [-]03 [-]2.0E [-]03 6.6E [-]04 [-]1.2E [-]04 1.3E [-]05 [-]7.9E [-]07 2.7E [-]08 [-]3.8E [-]10 11 0.0E+00 [-]1.3E [-]02 1.4E [-]02 [-]6.7E [-]03 1.9E [-]03 [-]3.3E [-]04 3.6E [-]05 [-]2.4E [-]06 8.7E [-]08 [-]1.3E [-]09 12 0.0E+00 1.3E [-]02 [-]8.1E [-]03 4.0E [-]03 [-]1.1E [-]03 1.6E [-]04 [-]1.3E [-]05 6.5E [-]07 [-]1.5E [-]08 1.3E [-]10 13 0.0E+00 2.2E [-]02 [-]1.3E [-]02 5.8E [-]03 [-]1.6E [-]03 2.5E [-]04 [-]2.5E [-]05 1.5E [-]06 [-]5.2E [-]08 7.6E [-]10

[0095] Figure 9 is a configuration diagram of the fifth example of the optical imaging system, and Figure 10 shows the aberration curves of the optical imaging system shown in Figure 9.

[0096] The optical imaging system 500 includes a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, and a fifth lens 550.

[0097] The first lens 510 has positive refractive power. The first lens 510 has a convex object-side surface and a convex image-side surface. The second lens 520 has negative refractive power. The second lens 520 has a concave object-side surface and a convex image-side surface. The third lens 530 has positive refractive power. The third lens 530 has a convex object-side surface and a convex image-side surface. The fourth lens 540 has negative refractive power. The fourth lens 540 has a concave object-side surface and a convex image-side surface. The fifth lens 550 has positive refractive power. The fifth lens 550 has a concave object-side surface and a convex image-side surface.

[0098] The optical imaging system 500 further includes a prism P, a filter 570, and an image sensor 580.

[0099] The optical imaging system 500 includes a prism P as a tool for folding the optical path of light within the optical imaging system 500. The prism P folds a first optical axis C1 to form a second optical axis C2. The second optical axis C2 is substantially perpendicular to the first optical axis C1. The prism P is disposed on the object side of a first lens 510 and reflects light reflected from an object to an image sensor 580.

[0100] A filter 570 is positioned in front of the image sensor 580 and blocks infrared radiation contained in the incident light. The image sensor 580 includes multiple optical sensors and is configured to convert optical signals into electrical signals.

[0101] Table 9 below shows the optical characteristics of the components of the optical imaging system 500, and Table 10 below shows the aspherical surface coefficients of the lenses of the optical imaging system 500. Table 9 Surface number element radius of curvature Thickness / Distance Refractive index Abbe number Effective radius of major axis effective radius of minor axis 0 object infinity infinity 1 Prism infinity 8.000 1.519 64.2 2 infinity 8.000 1.519 64.2 3 infinity 11.000 4 First lens 13.49 4.250 1.537 55.7 6.850 6.465 5 -13.00 1.439 6.614 6.277 6 Second lens -6.29 0.600 1.621 26.0 6.017 5.851 7 -80.4985 0.546 5.628644211 5.536 8 Third lens 36.0447 2.486 1.680 19.2 5.575668112 5.474 9 -21.7129 0.918 5.47 5.462 10 Fourth lens -6.53 1.185 1.642 23.9 5.433 5.416 11 -9.96 0.025 5.674 5.607 12 Fifth lens -12.00 0.702 1.571 37.4 5.479 5.382 13 -11.90 1.020 5.267 5.159 14 filter infinity 0.110 1.519 64.2 15 infinity 32.901 16 Imaging plane infinity 0.000 Table 10 Surface number k A B C D E F G H J 4 [-]1.2E+00 [-]6.6E [-]05 4.5E [-]05 [-]8.4E [-]06 1.3E [-]06 [-]1.3E [-]07 7.7E [-]09 [-]2.6E [-]10 4.5E [-]12 [-]3.2E [-]14 5 0.0E+00 1.1E [-]03 [-]5.8E [-]04 1.6E [-]04 [-]2.3E [-]05 2.0E [-]06 [-]1.1E [-]07 3.6E [-]09 [-]6.7E [-]11 5.3E [-]13 6 0.0E+00 [-]5.3E [-]03 6.6E [-]04 [-]3.1E [-]05 [-]1.2E [-]05 2.8E [-]06 [-]2.7E [-]07 1.4E [-]08 [-]3.7E [-]10 4.1E [-]12 7 0.0E+00 [-]7.8E [-]03 [-]2.3E [-]03 1.7E [-]03 [-]5.1E [-]04 8.4E [-]05 [-]8.2E [-]06 4.7E [-]07 [-]1.5E [-]08 2.0E [-]10 8 0.0E+00 [-]3.6E [-]04 [-]7.6E [-]03 3.9E [-]03 [-]1.0E [-]03 1.5E [-]04 [-]1.4E [-]05 8.3E [-]07 [-]2.6E [-]08 3.6E [-]10 9 0.0E+00 1.3E [-]03 [-]9.1E [-]03 4.7E [-]03 [-]1.3E [-]03 2.0E [-]04 [-]2.0E [-]05 1.2E [-]06 [-]4.2E [-]08 6.1E [-]10 10 0.0E+00 2.4E [-]03 3.1E [-]03 [-]2.0E [-]03 6.6E [-]04 [-]1.2E [-]04 1.3E [-]05 [-]7.9E [-]07 2.7E [-]08 [-]3.8E [-]10 11 0.0E+00 [-]1.3E [-]02 1.4E [-]02 [-]6.7E [-]03 1.9E [-]03 [-]3.3E [-]04 3.6E [-]05 [-]2.4E [-]06 8.7E [-]08 [-]1.3E [-]09 12 0.0E+00 1.3E [-]02 [-]8.1E [-]03 4.0E [-]03 [-]1.1E [-]03 1.6E [-]04 [-]1.3E [-]05 6.5E [-]07 [-]1.5E [-]08 1.3E [-]10 13 0.0E+00 2.2E [-]02 [-]1.3E [-]02 5.8E [-]03 [-]1.6E [-]03 2.5E [-]04 [-]2.5E [-]05 1.5E [-]06 [-]5.2E [-]08 7.6E [-]10

[0102] Figure 11 is a configuration diagram of a sixth example of an optical imaging system, and Figure 12 shows the aberration curves of the optical imaging system shown in Figure 11.

[0103] The optical imaging system 600 includes a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, and a fifth lens 650.

[0104] The first lens 610 has positive refractive power. The first lens 610 has a convex object-side surface and a convex image-side surface. The second lens 620 has negative refractive power. The second lens 620 has a convex object-side surface and a concave image-side surface. The third lens 630 has positive refractive power. The third lens 630 has a convex object-side surface and a convex image-side surface. The fourth lens 640 has negative refractive power. The fourth lens 640 has a concave object-side surface and a convex image-side surface. The fifth lens 650 has positive refractive power. The fifth lens 650 has a concave object-side surface and a convex image-side surface.

[0105] The optical imaging system 600 further includes a prism P, a filter 670, and an image sensor 680.

[0106] The optical imaging system 600 includes a prism P as a tool for folding the optical path of light within the optical imaging system 600. The prism P folds a first optical axis C1 to form a second optical axis C2. The second optical axis C2 is substantially perpendicular to the first optical axis C1. The prism P is disposed on the object side of a first lens 610 and reflects light reflected from an object to an image sensor 680.

[0107] A filter 670 is positioned in front of the image sensor 680 and blocks infrared radiation contained in the incident light. The image sensor 680 includes multiple optical sensors and is configured to convert optical signals into electrical signals.

[0108] Table 11 below shows the optical characteristics of the components of the optical imaging system 600, and Table 12 below shows the aspherical surface coefficients of the lenses of the optical imaging system 600. Table 11 Surface number element radius of curvature Thickness / Distance Refractive index Abbe number Effective radius of major axis effective radius of minor axis 0 object infinity infinity 1 Prism infinity 8.000 1.519 64.2 2 infinity 8.000 1.519 64.2 3 infinity 11.000 4 First lens 11.08 3.368 1.537 55.7 7.497 6.784 5 -33.62 0.978 7.376 6.627 6 Second lens 26.46 0.450 1.621 26.0 6.787 6.160 7 6.14 1.809 5.958 5.685 8 Third lens 16.81 3.000 1.680 19.2 5.899 5.594 9 -44.57 0.745 5.600 5.570 10 Fourth lens -7.01 0.675 1.642 23.9 5.546 5.547 11 -21.52 0.094 5.647 5.591 12 Fifth lens -11.49 0.871 1.571 37.4 5.635 5.572 13 -7.50 1.020 5.591 5.525 14 filter infinity 0.110 1.519 64.2 15 infinity 34.086 16 Imaging plane infinity 0.000 Table 12 Surface number k A B C D E F G H J 4 [-]1.2E+00 [-]6.6E [-]05 4.5E [-]05 [-]8.4E [-]06 1.3E [-]06 [-]1.3E [-]07 7.7E [-]09 [-]2.6E [-]10 4.5E [-]12 [-]3.2E [-]14 5 0.0E+00 1.1E [-]03 [-]5.8E [-]04 1.6E [-]04 [-]2.3E [-]05 2.0E [-]06 [-]1.1E [-]07 3.6E [-]09 [-]6.7E [-]11 5.3E [-]13 6 0.0E+00 [-]5.3E [-]03 6.6E [-]04 [-]3.1E [-]05 [-]1.2E [-]05 2.8E [-]06 [-]2.7E [-]07 1.4E [-]08 [-]3.7E [-]10 4.1E [-]12 7 0.0E+00 [-]7.8E [-]03 [-]2.3E [-]03 1.7E [-]03 [-]5.1E [-]04 8.4E [-]05 [-]8.2E [-]06 4.7E [-]07 [-]1.5E [-]08 2.0E [-]10 8 0.0E+00 [-]3.6E [-]04 [-]7.6E [-]03 3.9E [-]03 [-]1.0E [-]03 1.5E [-]04 [-]1.4E [-]05 8.3E [-]07 [-]2.6E [-]08 3.6E [-]10 9 0.0E+00 1.3E [-]03 [-]9.1E [-]03 4.7E [-]03 [-]1.3E [-]03 2.0E [-]04 [-]2.0E [-]05 1.2E [-]06 [-]4.2E [-]08 6.1E [-]10 10 0.0E+00 2.4E [-]03 3.1E [-]03 [-]2.0E [-]03 6.6E [-]04 [-]1.2E [-]04 1.3E [-]05 [-]7.9E [-]07 2.7E [-]08 [-]3.8E [-]10 11 0.0E+00 [-]1.3E [-]02 1.4E [-]02 [-]6.7E [-]03 1.9E [-]03 [-]3.3E [-]04 3.6E [-]05 [-]2.4E [-]06 8.7E [-]08 [-]1.3E [-]09 12 0.0E+00 1.3E [-]02 [-]8.1E [-]03 4.0E [-]03 [-]1.1E [-]03 1.6E [-]04 [-]1.3E [-]05 6.5E [-]07 [-]1.5E [-]08 1.3E [-]10 13 0.0E+00 2.2E [-]02 [-]1.3E [-]02 5.8E [-]03 [-]1.6E [-]03 2.5E [-]04 [-]2.5E [-]05 1.5E [-]06 [-]5.2E [-]08 7.6E [-]10

[0109] Figure 13 is a configuration diagram of the seventh example of the optical imaging system, and Figure 14 shows the aberration curves of the optical imaging system shown in Figure 13.

[0110] The optical imaging system 700 includes a first lens 710, a second lens 720, a third lens 730, a fourth lens 740, and a fifth lens 750.

[0111] The first lens 710 has positive refractive power. The first lens 710 has a convex object-side surface and a convex image-side surface. The second lens 720 has negative refractive power. The second lens 720 has a convex object-side surface and a concave image-side surface. The third lens 730 has positive refractive power. The third lens 730 has a convex object-side surface and a convex image-side surface. The fourth lens 740 has negative refractive power. The fourth lens 740 has a concave object-side surface and a convex image-side surface. The fifth lens 750 has negative refractive power. The fifth lens 750 has a concave object-side surface and a convex image-side surface.

[0112] The optical imaging system 700 includes a prism P, a filter 770, and an image sensor 780.

[0113] The optical imaging system 700 includes a prism P as a tool for folding the optical path of light within the optical imaging system 700. The prism P folds a first optical axis C1 to form a second optical axis C2. The second optical axis C2 is substantially perpendicular to the first optical axis C1. The prism P is disposed on the object side of a first lens 710 and reflects light reflected from an object to an image sensor 780.

[0114] A filter 770 is positioned in front of the image sensor 780 and blocks infrared radiation contained in the incident light. The image sensor 780 includes multiple optical sensors and is configured to convert optical signals into electrical signals.

[0115] Table 13 below shows the optical characteristics of the components of the optical imaging system 700, and Table 14 below shows the aspherical surface coefficient of the lens of the optical imaging system 700. Table 13 Surface number element radius of curvature Thickness / Distance Refractive index Abbe number Effective radius of major axis effective radius of minor axis 0 object infinity infinity 1 Prism infinity 8.000 1.519 64.2 2 infinity 8.000 1.519 64.2 3 infinity 11.000 4 First lens 10.54 5.751 1.537 55.7 7.717 7.038 5 -18.00 0.506 7.164 6.560 6 Second lens 150.16 0.450 1.621 26.0 6.442 6.060 7 6.32 1.506 5.684 5.504 8 Third lens 17.33 2.863 1.680 19.2 5.586 5.433 9 -71.51 0.840 5.370 5.344 10 Fourth lens -7.17 0.500 1.642 23.9 5.322 5.312 11 -9.79 0.216 5.343 5.311 12 Fifth lens -6.93 0.964 1.571 37.4 5.297 5.258 13 -7.71 1.020 5.307 5.227 14 filter infinity 0.110 1.519 64.2 15 infinity 30.872 16 Imaging plane infinity 0.000 Table 14 Surface number k A B C D E F G H J 4 [-]1.2E+00 [-]6.6E [-]05 4.5E [-]05 [-]8.4E [-]06 1.3E [-]06 [-]1.3E [-]07 7.7E [-]09 [-]2.6E [-]10 4.5E [-]12 [-]3.2E [-]14 5 0.0E+00 1.1E [-]03 [-]5.8E [-]04 1.6E [-]04 [-]2.3E [-]05 2.0E [-]06 [-]1.1E [-]07 3.6E [-]09 [-]6.7E [-]11 5.3E [-]13 6 0.0E+00 [-]5.3E [-]03 6.6E [-]04 [-]3.1E [-]05 [-]1.2E [-]05 2.8E [-]06 [-]2.7E [-]07 1.4E [-]08 [-]3.7E [-]10 4.1E [-]12 7 0.0E+00 [-]7.8E [-]03 [-]2.3E [-]03 1.7E [-]03 [-]5.1E [-]04 8.4E [-]05 [-]8.2E [-]06 4.7E [-]07 [-]1.5E [-]08 2.0E [-]10 8 0.0E+00 [-]3.6E [-]04 [-]7.6E [-]03 3.9E [-]03 [-]1.0E [-]03 1.5E [-]04 [-]1.4E [-]05 8.3E [-]07 [-]2.6E [-]08 3.6E [-]10 9 0.0E+00 1.3E [-]03 [-]9.1E [-]03 4.7E [-]03 [-]1.3E [-]03 2.0E [-]04 [-]2.0E [-]05 1.2E [-]06 [-]4.2E [-]08 6.1E [-]10 10 0.0E+00 2.4E [-]03 3.1E [-]03 [-]2.0E [-]03 6.6E [-]04 [-]1.2E [-]04 1.3E [-]05 [-]7.9E [-]07 2.7E [-]08 [-]3.8E [-]10 11 0.0E+00 [-]1.3E [-]02 1.4E [-]02 [-]6.7E [-]03 1.9E [-]03 [-]3.3E [-]04 3.6E [-]05 [-]2.4E [-]06 8.7E [-]08 [-]1.3E [-]09 12 0.0E+00 1.3E [-]02 [-]8.1E [-]03 4.0E [-]03 [-]1.1E [-]03 1.6E [-]04 [-]1.3E [-]05 6.5E [-]07 [-]1.5E [-]08 1.3E [-]10 13 0.0E+00 2.2E [-]02 [-]1.3E [-]02 5.8E [-]03 [-]1.6E [-]03 2.5E [-]04 [-]2.5E [-]05 1.5E [-]06 [-]5.2E [-]08 7.6E [-]10

[0116] Figure 15 is a configuration diagram of the eighth example of the optical imaging system, and Figure 16 shows the aberration curves of the optical imaging system shown in Figure 15.

[0117] The optical imaging system 800 includes a first lens 810, a second lens 820, a third lens 830, a fourth lens 840, and a fifth lens 850.

[0118] The first lens 810 has positive refractive power. The first lens 810 has a convex object-side surface and a convex image-side surface. The second lens 820 has negative refractive power. The second lens 820 has a concave object-side surface and a convex image-side surface. The third lens 830 has positive refractive power. The third lens 830 has a convex object-side surface and a convex image-side surface. The fourth lens 840 has negative refractive power. The fourth lens 840 has a concave object-side surface and a convex image-side surface. The fifth lens 850 has negative refractive power. The fifth lens 850 has a concave object-side surface and a convex image-side surface.

[0119] The optical imaging system 800 further includes a prism P, a filter 870, and an image sensor 880.

[0120] The optical imaging system 800 includes a prism P as a tool for folding the optical path of light within the optical imaging system 800. The prism P folds a first optical axis C1 to form a second optical axis C2. The second optical axis C2 is substantially perpendicular to the first optical axis C1. The prism P is disposed on the object side of a first lens 810 and reflects light reflected from an object to an image sensor 880.

[0121] A filter 870 is positioned in front of the image sensor 880 and blocks infrared radiation contained in the incident light. The image sensor 880 includes multiple optical sensors and is configured to convert optical signals into electrical signals.

[0122] Table 15 below shows the optical characteristics of the components of the optical imaging system 800, and Table 16 below shows the aspherical surface coefficient of the lens of the optical imaging system 800. Table 15 Surface number element radius of curvature Thickness / Distance Refractive index Abbe number Effective radius of major axis effective radius of minor axis 0 object infinity infinity 1 Prism infinity 8.000 1.519 64.2 2 infinity 8.000 1.519 64.2 3 infinity 11.000 4 First lens 12.72 6.400 1.537 55.7 7.000 6.752 5 -13.52 1.073 6.365 6.164 6 Second lens -6.21 0.450 1.621 26.0 5.843 5.717 7 -85.65 0.879 5.349 5.308 8 Third lens 35.52 3.220 1.680 19.2 5.312 5.267 9 -22.75 0.984 5.461 5.457 10 Fourth lens -6.53 0.500 1.642 23.9 5.400 5.408 11 -8.96 1.438 5.605 5.595 12 Fifth lens -13.22 0.993 1.571 37.4 5.182 5.050 13 -14.69 1.020 4.998 4.847 14 filter infinity 0.110 1.519 64.2 15 infinity 28.749 16 Imaging plane infinity 0.000 Table 16 Surface number k A B C D E F G H J 4 [-]1.2E+00 [-]6.6E [-]05 4.5E [-]05 [-]8.4E [-]06 1.3E [-]06 [-]1.3E [-]07 7.7E [-]09 [-]2.6E [-]10 4.5E [-]12 [-]3.2E [-]14 5 0.0E+00 1.1E [-]03 [-]5.8E [-]04 1.6E [-]04 [-]2.3E [-]05 2.0E [-]06 [-]1.1E [-]07 3.6E [-]09 [-]6.7E [-]11 5.3E [-]13 6 0.0E+00 [-]5.3E [-]03 6.6E [-]04 [-]3.1E [-]05 [-]1.2E [-]05 2.8E [-]06 [-]2.7E [-]07 1.4E [-]08 [-]3.7E [-]10 4.1E [-]12 7 0.0E+00 [-]7.8E [-]03 [-]2.3E [-]03 1.7E [-]03 [-]5.1E [-]04 8.4E [-]05 [-]8.2E [-]06 4.7E [-]07 [-]1.5E [-]08 2.0E [-]10 8 0.0E+00 [-]3.6E [-]04 [-]7.6E [-]03 3.9E [-]03 [-]1.0E [-]03 1.5E [-]04 [-]1.4E [-]05 8.3E [-]07 [-]2.6E [-]08 3.6E [-]10 9 0.0E+00 1.3E [-]03 [-]9.1E [-]03 4.7E [-]03 [-]1.3E [-]03 2.0E [-]04 [-]2.0E [-]05 1.2E [-]06 [-]4.2E [-]08 6.1E [-]10 10 0.0E+00 2.4E [-]03 3.1E [-]03 [-]2.0E [-]03 6.6E [-]04 [-]1.2E [-]04 1.3E [-]05 [-]7.9E [-]07 2.7E [-]08 [-]3.8E [-]10 11 0.0E+00 [-]1.3E [-]02 1.4E [-]02 [-]6.7E [-]03 1.9E [-]03 [-]3.3E [-]04 3.6E [-]05 [-]2.4E [-]06 8.7E [-]08 [-]1.3E [-]09 12 0.0E+00 1.3E [-]02 [-]8.1E [-]03 4.0E [-]03 [-]1.1E [-]03 1.6E [-]04 [-]1.3E [-]05 6.5E [-]07 [-]1.5E [-]08 1.3E [-]10 13 0.0E+00 2.2E [-]02 [-]1.3E [-]02 5.8E [-]03 [-]1.6E [-]03 2.5E [-]04 [-]2.5E [-]05 1.5E [-]06 [-]5.2E [-]08 7.6E [-]10

[0123] Figure 17 is a configuration diagram of the ninth example of the optical imaging system, and Figure 18 shows the aberration curves of the optical imaging system shown in Figure 17.

[0124] The optical imaging system 900 includes 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.

[0125] The first lens 910 has positive refractive power. The first lens 910 has a convex object-side surface and a concave image-side surface. The second lens 920 has positive refractive power. The second lens 920 has a convex object-side surface and a convex image-side surface. The third lens 930 has negative refractive power. The third lens 930 has a concave object-side surface and a convex image-side surface. The fourth lens 940 has positive refractive power. The fourth lens 940 has a convex object-side surface and a convex image-side surface. The fifth lens 950 has negative refractive power. The fifth lens 950 has a concave object-side surface and a convex image-side surface. The sixth lens 960 has positive refractive power. The sixth lens 960 has a concave object-side surface and a convex image-side surface.

[0126] The optical imaging system 900 includes a prism P, a filter 970, and an image sensor 980.

[0127] The optical imaging system 900 includes a prism P as a tool for folding the optical path of light within the optical imaging system 900. The prism P folds a first optical axis C1 to form a second optical axis C2. The second optical axis C2 is substantially perpendicular to the first optical axis C1. The prism P is disposed on the object side of a first lens 910 and reflects light reflected from an object to an image sensor 980.

[0128] A filter 970 is positioned in front of the image sensor 980 and blocks infrared radiation contained in the incident light. The image sensor 980 includes multiple optical sensors and is configured to convert optical signals into electrical signals.

[0129] Table 17 below shows the optical characteristics of the components of the optical imaging system 900, and Table 18 below shows the aspherical surface coefficient of the lens of the optical imaging system 900. Table 17 Surface number element radius of curvature Thickness / Distance Refractive index Abbe number Effective radius of major axis effective radius of minor axis 0 object infinity infinity 1 Prism infinity 8.000 1.519 64.2 2 infinity 8.000 1.519 64.2 3 infinity 11.000 4 First lens 8.01 2.630 1.537 55.7 4.700 4.577 5 62.72 0.153 4.430 4.313 6 Second lens 58.22 2.352 1.537 55.7 4.385 4.270 7 -9.30 0.611 4.049 3.967 8 Third lens -4.04 0.450 1.621 26.0 3.788 3.738 9 -50.44 0.590 3.445 3.430 10 Fourth lens 23.92 1.640 1.680 19.2 3.429 3.414 11 -15.78 0.534 3.531 3.527 12 Fifth lens -4.42 0.600 1.642 23.9 3.500 3.500 13 -6.62 0.071 3.646 3.624 14 Sixth lens -8.26 0.700 1.571 37.4 3.524 3.468 15 -7.94 1.020 3.427 3.338 16 filter infinity 0.110 1.519 64.2 17 28.749 18 Imaging plane 0.000 Table 18 Surface number k A B C D E F G H J 4 [-]8.9E [-]01 1.5E [-]04 7.2E [-]05 [-]1.7E [-]05 2.6E [-]06 [-]2.5E [-]07 1.5E [-]08 [-]5.5E [-]10 1.1E [-]11 [-]9.7E [-]14 5 0.0E+00 [-]2.4E [-]05 2.6E [-]05 [-]1.4E [-]05 3.8E [-]06 [-]5.6E [-]07 4.7E [-]08 [-]2.2E [-]09 5.5E [-]11 [-]5.4E [-]13 6 0.0E+00 [-]2.5E [-]05 [-]1.8E [-]07 6.0E [-]06 [-]2.0E [-]06 3.1E [-]07 [-]2.7E [-]08 1.3E [-]09 [-]3.7E [-]11 4.4E [-]13 7 0.0E+00 [-]4.1E [-]03 2.5E [-]03 [-]6.1E [-]04 8.4E [-]05 [-]6.7E [-]06 3.0E [-]07 [-]5.5E [-]09 [-]4.2E [-]11 2.3E [-]12 8 0.0E+00 7.8E [-]03 1.0E [-]03 [-]2.3E [-]04 [-]3.9E [-]05 1.8E [-]05 [-]2.6E [-]06 1.8E [-]07 [-]6.7E [-]09 1.0E [-]10 9 0.0E+00 1.2E [-]02 [-]5.9E [-]03 2.2E [-]03 [-]4.8E [-]04 5.8E [-]05 [-]3.4E [-]06 2.9E [-]08 5.7E [-]09 [-]1.9E [-]10 10 0.0E+00 6.0E [-]04 [-]3.7E [-]03 1.2E [-]03 [-]1.4E [-]04 [-]1.1E [-]05 4.8E [-]06 [-]5.2E [-]07 2.6E [-]08 [-]5.1E [-]10 11 0.0E+00 [-]9.5E [-]03 1.7E [-]03 [-]3.0E [-]04 9.1E [-]05 [-]2.3E [-]05 3.3E [-]06 [-]2.5E [-]07 9.4E [-]09 [-]1.4E [-]10 12 0.0E+00 [-]7.5E [-]03 6.0E [-]03 [-]1.8E [-]03 3.8E [-]04 [-]5.7E [-]05 5.9E [-]06 [-]3.9E [-]07 1.5E [-]08 [-]2.3E [-]10 13 0.0E+00 1.8E [-]03 [-]7.2E [-]04 5.7E [-]04 [-]2.3E [-]04 4.7E [-]05 [-]5.4E [-]06 3.6E [-]07 [-]1.3E [-]08 1.9E [-]10 14 0.0E+00 4.2E [-]03 [-]3.3E [-]03 1.9E [-]03 [-]5.2E [-]04 8.2E [-]05 [-]7.8E [-]06 4.4E [-]07 [-]1.4E [-]08 1.9E [-]10 15 0.0E+00 2.8E [-]03 4.2E [-]04 4.5E [-]05 1.8E [-]05 [-]1.4E [-]05 2.7E [-]06 [-]2.5E [-]07 1.1E [-]08 [-]2.0E [-]10

[0130] Figure 19 is a configuration diagram of the tenth example of the optical imaging system, and Figure 20 shows the aberration curves of the optical imaging system shown in Figure 19.

[0131] The optical imaging system 1000 includes a first lens 1010, a second lens 1020, a third lens 1030, a fourth lens 1040, and a fifth lens 1050.

[0132] The first lens 1010 has a positive refractive power. The first lens 1010 has a convex object-side surface and a convex image-side surface. The second lens 1020 has a negative refractive power. The second lens 1020 has a concave object-side surface and a concave image-side surface. The third lens 1030 has a negative refractive power. The third lens 1030 has a convex object-side surface and a concave image-side surface. The fourth lens 1040 has a positive refractive power. The fourth lens 1040 has a concave object-side surface and a convex image-side surface. The fifth lens 1050 has a negative refractive power. The fifth lens 1050 has a concave object-side surface and a convex image-side surface.

[0133] The optical imaging system 1000 further includes a first prism P1, a filter 1070, a second prism P2, and an image sensor 1080.

[0134] The optical imaging system 1000 includes a first prism P1 as a tool for folding the optical path of light in the optical imaging system 1000. The first prism P1 folds a first optical axis C1 to form a second optical axis C2. The second optical axis C2 is substantially perpendicular to the first optical axis C1. The first prism P1 is disposed on the object side of the first lens 1010 and reflects light reflected from the object to the second prism P2.

[0135] The optical imaging system 1000 includes a second prism P2 as another tool for folding the optical path of light in the optical imaging system 1000. The second prism P2 folds the second optical axis C2 to form a third optical axis C3. The third optical axis C3 is substantially perpendicular to the second optical axis C2. The second prism P2 is disposed between the fifth lens 1050 and the image sensor 1080, and reflects the light reflected by the first prism P1 to the image sensor 1080.

[0136] A filter 1070 is positioned in front of the image sensor 1080 and blocks infrared radiation contained in the incident light. The image sensor 1080 includes multiple optical sensors and is configured to convert optical signals into electrical signals.

[0137] Table 19 below shows the optical characteristics of the components of the optical imaging system 1000, and Table 20 below shows the aspherical surface coefficients of the optical imaging system 1000. Table 19 Surface number element radius of curvature Thickness / Distance Refractive index Abbe number Effective radius of major axis effective radius of minor axis 0 object infinity infinity 1 First Prism infinity 6.000 1.519 64.2 2 infinity 6.000 1.519 64.2 3 infinity 9.000 4 First lens 7.12 6.000 1.536 23.9 4.400 4.338 5 -10.60 1.027 3.542 3.494 6 Second lens -4.37 0.450 1.621 55.7 3.135 3.035 7 43.64 0.029 2.898 2.767 8 Third lens 5.19 1.199 1.621 26.0 2.872 2.730 9 4.39 1.524 2.620 2.481 10 Fourth lens -6.18 1.731 1.621 26.0 3.500 2.471 11 -4.33 1.120 3.013 2.788 12 Fifth lens -7.13 2.211 1.571 26.0 3.082 2.685 13 -8.89 1.020 3.417 2.905 14 aperture infinity 0.000 15 Second prism infinity 3.200 1.519 64.2 16 infinity 3.200 1.519 64.2 17 infinity 1.500 18 filter infinity 0.110 1.519 64.2 19 infinity 7.511 20 Imaging plane infinity 0.000 Table 20 Surface number k A B C D E F G H J 4 -9.50E-01 -3.27E-05 1.81E-04 -3.65E-05 4.25E-06 -2.97E-07 1.19E-08 -2.39E-10 1.02E-12 2.44E-14 5 0.00E+00 -3.82E-03 4.37E-03 -1.70E-03 3.86E-04 -5.58E-05 5.23E-06 -3.07E-07 1.02E-08 -1.49E-10 6 0.00E+00 7.44E-04 1.35E-02 -7.88E-03 2.44E-03 -4.67E-04 5.74E-05 -4.41E-06 1.94E-07 -3.73E-09 7 0.00E+00 -3.49E-03 2.35E-02 -1.99E-02 8.98E-03 -2.46E-03 4.20E-04 -4.35E-05 2.50E-06 -6.10E-08 8 0.00E+00 -2.25E-02 3.41E-02 -2.84E-02 1.34E-02 -3.83E-03 6.71E-04 -7.05E-05 4.07E-06 -9.93E-08 9 0.00E+00 -3.01E-02 3.48E-02 -2.91E-02 1.51E-02 -4.91E-03 9.93E-04 -1.21E-04 8.17E-06 -2.33E-07 10 0.00E+00 3.24E-03 -4.19E-03 8.80E-04 -5.91E-05 -1.01E-05 2.94E-06 -3.13E-07 1.60E-08 -3.22E-10 11 0.00E+00 1.57E-02 -7.16E-03 1.94E-03 -4.34E-04 9.15E-05 -1.51E-05 1.61E-06 -9.57E-08 2.39E-09 12 0.00E+00 1.31E-02 -6.03E-03 8.79E-04 1.42E-04 -8.15E-05 1.53E-05 -1.54E-06 8.37E-08 -1.91E-09 13 0.00E+00 1.95E-03 -1.66E-03 4.82E-04 -8.88E-05 1.10E-05 -8.85E-07 4.15E-08 -8.33E-10 -6.42E-13

[0138] Figure 21 is a configuration diagram of the eleventh example of the optical imaging system, and Figure 22 shows the aberration curves of the optical imaging system shown in Figure 21.

[0139] The optical imaging system 1100 includes a first lens 1110, a second lens 1120, a third lens 1130, a fourth lens 1140, and a fifth lens 1150.

[0140] The first lens 1110 has positive refractive power. The first lens 1110 has a convex object-side surface and a convex image-side surface. The second lens 1120 has negative refractive power. The second lens 1120 has a convex object-side surface and a concave image-side surface. The third lens 1130 has negative refractive power. The third lens 1130 has a convex object-side surface and a concave image-side surface. The fourth lens 1140 has positive refractive power. The fourth lens 1140 has a concave object-side surface and a convex image-side surface. The fifth lens 1150 has negative refractive power. The fifth lens 1150 has a concave object-side surface and a convex image-side surface.

[0141] The optical imaging system 1100 further includes a first prism P1, a filter 1170, a second prism P2, and an image sensor 1180.

[0142] The optical imaging system 1100 includes a first prism P1 as a tool for folding the optical path of light within the optical imaging system 1100. The first prism P1 folds a first optical axis C1 to form a second optical axis C2. The second optical axis C2 is substantially perpendicular to the first optical axis C1. The first prism P1 is disposed on the object side of the first lens 1110 and reflects light reflected from the object to the second prism P2.

[0143] The optical imaging system 1100 includes a second prism P2 as another tool for folding the optical path of light in the optical imaging system 1100. The second prism P2 folds the second optical axis C2 to form a third optical axis C3. The third optical axis C3 is substantially perpendicular to the second optical axis C2. The second prism P2 is disposed between the fifth lens 1150 and the image sensor 1180, and reflects the light reflected by the first prism P1 to the image sensor 1180.

[0144] A filter 1170 is positioned in front of the image sensor 1180 and blocks infrared radiation contained in the incident light. The image sensor 1180 includes multiple optical sensors and is configured to convert optical signals into electrical signals.

[0145] Table 21 below shows the optical characteristics of the components of the optical imaging system 1100, and Table 22 below shows the aspherical surface coefficients of the optical imaging system 1100. Table 21 Surface number element radius of curvature Thickness / Distance Refractive index Abbe number Effective radius of major axis effective radius of minor axis 0 object infinity infinity 1 First Prism 6.000 1.519 64.2 2 6.000 1.519 64.2 3 9.000 4 First lens 5.74 3.685 1.530 23.9 4.500 4.070 5 -12.21 0.516 4.490 3.707 6 Second lens 20.70 0.450 1.620 55.7 3.414 3.160 7 3.61 1.603 2.895 2.755 8 Third lens 87.90 1.987 1.679 26.0 2.861 2.698 9 76.43 0.311 2.848 2.761 10 Fourth lens -6.50 0.643 1.640 26.0 2.746 2.757 11 -4.79 0.157 2.840 2.768 12 Fifth lens -3.79 0.600 1.570 26.0 2.807 2.732 13 -5.12 1.020 2.892 2.764 14 aperture infinity 0.000 15 Second prism infinity 3.200 1.519 64.2 16 infinity 3.200 1.519 64.2 17 infinity 2.000 18 filter infinity 0.110 19 infinity 9.626 20 Imaging plane infinity 0.000 Table 22 Surface number k A B C D E F G H J 4 -1.13E+00 -1.46E-03 8.62E-04 -2.16E-04 3.25E-05 -3.03E-06 1.76E-07 -6.20E-09 1.21E-10 -9.98E-13 5 0.00E+00 2.25E-03 -7.70E-04 1.64E-04 -2.28E-05 2.10E-06 -1.23E-07 4.38E-09 -8.64E-11 7.20E-13 6 0.00E+00 -3.14E-03 1.40E-03 -8.96E-04 2.28E-04 -3.06E-05 2.42E-06 -1.13E-07 2.87E-09 -3.06E-11 7 0.00E+00 -1.32E-02 9.70E-03 -5.40E-03 1.61E-03 -2.79E-04 2.91E-05 -1.79E-06 5.98E-08 -8.41E-10 8 0.00E+00 -1.49E-03 -7.66E-03 3.86E-03 -8.58E-04 1.03E-04 -7.28E-06 3.13E-07 -8.56E-09 1.28E-10 9 0.00E+00 3.89E-03 -1.49E-02 6.20E-03 -9.94E-04 2.29E-05 1.36E-05 -1.90E-06 1.04E-07 -2.11E-09 10 0.00E+00 2.49E-03 5.96E-03 -4.74E-03 1.72E-03 -3.38E-04 3.83E-05 -2.49E-06 8.63E-08 -1.23E-09 11 0.00E+00 -2.29E-02 1.97E-02 -7.86E-03 1.90E-03 -2.94E-04 2.87E-05 -1.71E-06 5.64E-08 -7.81E-10 12 0.00E+00 2.31E-02 -3.01E-02 1.82E-02 -5.60E-03 9.96E-04 -1.06E-04 6.69E-06 -2.30E-07 3.33E-09 13 0.00E+00 3.84E-02 -3.11E-02 1.59E-02 -4.74E-03 8.62E-04 -9.69E-05 6.56E-06 -2.45E-07 3.87E-09

[0146] Table 23 below shows the optical characteristics of the first to eleventh examples of the optical imaging system. In Table 23, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens. f, BFL, TTL, and PTTL have been defined above. Table 23 Example f f1 f2 f3 f4 f5 f6 BFL TTL PTTL First Case 30.19 11.46 -9.26 13.40 -10.15 18.35 19.434 30.186 45.185 Second example 29.80 9.81 -7.66 12.13 -11.77 27.40 19.826 29.450 44.450 Third Case 31.46 8.77 -7.04 14.07 -28.97 -160.44 20.139 29.909 44.909 Fourth example 29.80 8.73 -7.48 15.74 -33.80 -172.20 20.604 29.711 44.711 Fifth Case 46.50 13.07 -11.03 20.30 -34.20 710.10 34.031 46.182 65.182 Sixth Case 46.50 15.95 -12.98 18.33 -16.51 35.04 35.216 47.207 66.206 Seventh Case 47.75 13.33 -10.64 20.80 -45.20 -222.71 32.002 45.598 64.598 Eighth Case 47.00 13.35 -10.81 20.87 -40.91 -306.79 29.879 45.816 64.816 Ninth Case 29.50 16.82 15.13 -7.11 14.23 -23.25 200.05 29.879 40.210 59.21 Tenth Case 29.50 9.01 -6.37 -109.62 17.12 -116.17 16.541 31.541 46.832 Eleventh Case 29.50 7.93 -7.14 -928.06 24.73 -30.49 19.156 29.108 44.108

[0147] Tables 24 and 25 below show the values ​​of conditional expressions 1 to 9 for the first to eleventh instances of the optical imaging system. As can be seen from Tables 24 and 25, except for the sixth instance which does not satisfy conditional expression 7 (0.8 ≤ TTL / f ≤ 1.0) and the eleventh instance which does not satisfy conditional expression 9 (0.2 ≤ L1R1 / f ≤ 0.3), the first to eleventh instances of the optical imaging system satisfy all of the conditions in conditions 1 and 2 to 9. Table 24 conditional expression First Case Second example Third Case Fourth example Fifth Case Sixth Case f number 2.9600 2.9600 3.2900 3.3800 3.4400 3.3900 Nd2+Nd3 3.3001 3.3001 3.3001 3.3001 3.3001 3.3001 f1+f2 2.2086 2.1510 1.7275 1.2541 2.0377 2.97 D12 / f 0.0130 0.0149 0.0164 0.0218 0.0310 0.0210 L1R2eMax / IMG_HT 1.8129 1.8129 1.8129 1.5231 1.6535 1.844 L1R2eMax / L1R1eMax 0.8826 0.8826 0.8826 0.9066 0.9655 0.9838 TTL / f 1.0000 0.9882 0.9507 0.9970 0.9932 1.0152 TTL / IMG_HT 11.526 11.245 11.420 11.345 11.546 11.802 L1R1 / f 0.2225 0.2377 0.2205 0.2635 0.2900 0.2382 Table 25 Conditional expressions Seventh Example Eighth Example Ninth Example Tenth Case Eleventh Case f number 3.2300 3.3500 3.1300 3.3500 3.2700 Nd2+Nd3 3.3001 3.3001 3.1572 3.2412 3.2990 f1+f2 2.6851 2.5450 31.9476 2.6300 0.7200 D12 / f 0.0106 0.0228 0.0052 0.0348 0.0175 L1R2eMax / IMG_HT 1.791 1.5913 1.6915 1.3524 1.7144 L1R2eMax / L1R1eMax 0.9284 0.9093 0.9425 0.8050 0.9978 TTL / f 0.9549 0.9549 1.3631 1.0692 0.9867 TTL / IMG_HT 11.400 11.454 15.3532 12.0432 11.1142 L1R1 / f 0.2208 0.2707 0.2714 0.2414 0.1947

[0148] Table 26 below shows other optical characteristics of the first to eleventh examples of the optical imaging system. Table 26 Example IMG_HT FOV 2θ AL1 First Case 2.619 9.92 24.167 88.140 Second example 2.619 10.00 27.713 86.767 Third Case 2.619 9.40 31.050 85.143 Fourth example 2.619 10.00 5.849 60.794 Fifth Case 4 9.80 19.297 145.075 Sixth Case 4 9.70 25.194 170.451 Seventh Case 4 9.50 24.208 181.312 Eighth Case 4 9.70 15.310 152.709 Ninth Case 2.619 10.10 45.573 56.343 Tenth Case 2.619 10.10 9.650 60.699 Eleventh Case 2.619 10.10 25.264 61.391

[0149] Tables 27 and 28 below show the values ​​of conditional expressions 10 to 14, 16 to 23 and 25 for the first to eleventh examples of the optical imaging system. Table 27 Example L1S1es / L1S1el L1S2es / L1S2el L2S1es / L2S1el L2S2es / L2S2el DPL1 SPY2 / SPX2 L1S1el / IMG_HT First Case 0.912 0.927 0.950 0.970 9.000 0.950 2.054 Second example 0.885 0.914 0.911 0.932 9.000 0.911 2.054 Third Case 0.857 0.911 0.886 0.920 9.000 0.886 2.054 Fourth example 0.995 0.996 0.998 0.700 9.000 0.998 1.680 Fifth Case 0.944 0.949 0.972 0.984 11.000 0.972 1.713 Sixth Case 0.905 0.898 0.908 0.954 11.000 0.908 1.874 Seventh Case 0.912 0.916 0.941 0.968 11.000 0.941 1.929 Eighth Case 0.965 0.968 0.978 0.992 11.000 0.978 1.750 Ninth Case 0.974 0.974 0.974 0.980 9.000 0.986 1.795 Tenth Case 0.986 0.986 0.968 0.955 9.000 0.968 1.680 Eleventh Case 0.904 0.826 0.926 0.951 9.000 0.926 1.718 Table 28 element L1S1el / PTTL L1S1es / PTTL L2S1el / PTTL L2S1es / PTTL AL1 / (PTTL) [, 2 , ] 2θ / FOV BFL / 2IMG_HT First Case 0.115 0.105 0.094 0.089 0.040 2.436 3.710 Second example 0.117 0.104 0.095 0.087 0.041 2.771 3.785 Third Case 0.116 0.099 0.094 0.084 0.040 3.303 3.845 Fourth example 0.095 0.095 0.081 0.081 0.028 0.585 3.934 Fifth Case 0.104 0.098 0.091 0.088 0.033 1.969 4.254 Sixth Case 0.112 0.101 0.101 0.092 0.038 2.597 4.402 Seventh Case 0.118 0.107 0.098 0.092 0.042 2.548 4.000 Eighth Case 0.106 0.103 0.089 0.087 0.035 1.578 3.735 Ninth Case 0.079 0.077 0.074 0.072 0.027 4.512 3.645 Tenth Case 0.096 0.094 0.068 0.066 0.029 0.955 2.713 Eleventh Case 0.104 0.094 0.079 0.073 0.033 2.501 3.213

[0150] Figure 23 is a plan view of an example of a first lens in an optical imaging system when viewed in the optical axis direction, and Figure 24 is a plan view of an example of a gap maintaining member disposed between the first lens and the second lens in an optical imaging system when viewed in the optical axis direction.

[0151] Referring to Figure 23, when viewed along the optical axis, the first lens L1 has a non-circular shape and includes two arcuate side surfaces and two straight side surfaces that are parallel to each other and connect the two arcuate side surfaces. Figure 23 shows the object-side surface of the first lens L1. The first lens L1 can be the first lens of any of the first to eleventh examples of the optical imaging system described above.

[0152] The first lens L1 includes an optical portion exhibiting the lens characteristics of the first lens L1 and a flange portion extending from the optical portion in a direction away from the optical axis C2, not exhibiting the lens characteristics of the first lens L1. The optical portion has two arcuate edges and two straight edges parallel to each other and connecting the two arcuate edges to each other. The flange portion includes a flange portion extending from one of the two arcuate edges of the optical portion and another flange portion extending from the other of the two arcuate edges of the optical portion.

[0153] The optical portion of the object-side surface of the first lens L1 has different lengths or effective radii in a first direction intersecting the optical axis C2 and parallel to the straight edge of the optical portion, and in a second direction intersecting the optical axis C2 and perpendicular to the first direction. The effective radius L1S1el (hereinafter referred to as the major axis effective radius L1S1el) of the optical portion of the object-side surface of the first lens L1 in the first direction is greater than the effective radius L1S1es (hereinafter referred to as the minor axis effective radius L1S1es) of the optical portion of the object-side surface of the first lens L1 in the second direction. The major axis effective radius L1S1el is measured from the optical axis C2 to one of the arcuate edges of the optical portion, and the minor axis effective radius L1S1es is measured from the optical axis C2 to one of the straight edges of the optical portion. In any of the first to eleventh examples of the above-described optical imaging system, the minor axis effective radius L1S1es is parallel to the first optical axis C1.

[0154] The major axis effective radius L1S1el is the maximum effective radius L1R1eMax of the optical portion of the object-side surface of the first lens L1, and the minor axis effective radius L1S1es is the minimum effective radius of the optical portion of the object-side surface of the first lens L1.

[0155] The straight edges of the optical components can be limited to a predetermined size. For example, the angle 2θ, which has a vertex at the optical axis C2 of the first lens L1 and is opposite to one of the straight edges of the optical components, can have a value in the range of 10° to 92°.

[0156] The area of ​​the object-side surface of the optical portion of the first lens L1 projected onto a plane perpendicular to the optical axis is AL1.

[0157] Although not shown in Figure 23, the image-side surface of the optical portion of the first lens L1 has a major axis effective radius L1S2el and a minor axis effective radius L1S2es. The major axis effective radius L1S2el is the maximum effective radius L1R2eMax of the optical portion of the image-side surface of the first lens L1, and the minor axis effective radius L1S2es is the minimum effective radius of the optical portion of the object-side surface of the first lens L1. The major axis effective radius L1S2el is parallel to the major axis effective radius L1S1el of the optical portion of the object-side surface of the first lens L1, and the minor axis effective radius L1S2es is parallel to the minor axis effective radius L1S1es of the optical portion of the object-side surface of the first lens L1.

[0158] Although only the first lens L1 is shown in Figure 23, one or more of the second to fifth or sixth lenses may have a non-circular shape that is the same as or similar to the non-circular shape of the first lens L1. For example, only the second lens may have a non-circular shape, while the third to fifth or sixth lenses may have a circular shape. Alternatively, all of the second to fifth or sixth lenses may have a non-circular shape. The second to fifth lenses may be the second to fifth lenses of any of the first to eighth, tenth, and eleventh examples of the optical imaging system described above. Alternatively, the second to sixth lenses may be the second to sixth lenses of the ninth example of the optical imaging system described above.

[0159] When the second lens has a non-circular shape that is the same as or similar to the non-circular shape of the first lens L1, the object-side surface of the optical portion of the second lens has a major axis effective radius L2S1el and a minor axis effective radius L2S1es. The major axis effective radius L2S1el is the maximum effective radius of the optical portion of the object-side surface of the second lens, and the minor axis effective radius L2S1es is the minimum effective radius of the optical portion of the object-side surface of the second lens. The major axis effective radius L2S1el is parallel to the major axis effective radius L1S1el of the optical portion of the object-side surface of the first lens L1, and the minor axis effective radius L2S1es is parallel to the minor axis effective radius L1S1es of the optical portion of the object-side surface of the first lens L1.

[0160] Furthermore, the image-side surface of the optical portion of the second lens has a major axis effective radius L2S2el and a minor axis effective radius L2S2es. The major axis effective radius L2S2el is the maximum effective radius of the optical portion of the image-side surface of the second lens, and the minor axis effective radius L2S2es is the minimum effective radius of the optical portion of the image-side surface of the second lens. The major axis effective radius L2S2el is parallel to the major axis effective radius L1S1el of the optical portion of the object-side surface of the first lens L1, and the minor axis effective radius L2S2es is parallel to the minor axis effective radius L1S1es of the optical portion of the object-side surface of the first lens.

[0161] Referring to Figure 24, a gap maintaining member SP is provided between the first lens L1 and the second lens (not shown) in Figure 23 to maintain the distance between the first lens L1 and the second lens, and the gap maintaining member SP has a non-circular shape when viewed in the optical axis direction. In the example shown in Figure 24, the gap maintaining member has a substantially rectangular shape and includes two arcuate outer surfaces and two straight outer surfaces connecting the two arcuate outer surfaces to each other. The two straight outer surfaces may be parallel to each other. However, this is only an example, and the gap maintaining member SP may have different non-circular shapes.

[0162] The length SPX1 of the gap maintaining member SP in the first direction is greater than the length SPY1 of the gap maintaining member SP in the second direction perpendicular to the first direction. The length SPX1 of the gap maintaining member SP is parallel to the effective radius L1S1el of the major axis of the optical portion of the object-side surface of the first lens L1, and the length SPY1 of the gap maintaining member SP is parallel to the effective radius L1S1es of the minor axis of the optical portion of the object-side surface of the first lens L1.

[0163] A hole is formed in the gap-maintaining member SP. The hole has a shape having a major axis and a minor axis. For example, the hole may be elliptical, rectangular with rounded corners, or any other shape having a major axis and a minor axis. The shape and size of the hole may be substantially the same as or similar to the shape and size of the optical portion of the first lens L1 in FIG. 23. The hole includes two arcuate sides and two straight sides connecting the two arcuate sides to each other. The two straight sides may be parallel to each other.

[0164] The length SPX2 of the hole in the first direction is greater than the length SPY2 of the hole in the second direction. The length SPX2 of the hole is parallel to both the length SPX1 of the gap maintaining member SP and the effective radius L1S1el of the major axis of the optical portion of the object-side surface of the first lens L1, and the length SPY2 of the hole is parallel to both the length SPY1 of the gap maintaining member SP and the effective radius L1S1es of the minor axis of the optical portion of the object-side surface of the first lens L1.

[0165] Figures 25 to 28 are rear views of examples of portable electronic devices equipped with multiple optical imaging systems.

[0166] Referring to Figures 25 to 28, the portable electronic device 10 is equipped with a rearward-facing telephoto optical imaging system 20 with a long focal length and includes a first lens L1 in Figure 23 and a gap maintaining member SP in Figure 24. The telephoto optical imaging system 20 can be any of the optical imaging systems 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000 and 1100 described in this application.

[0167] Referring to Figure 25, in addition to the telephoto optical imaging system 20, the portable electronic terminal 10 may be further equipped with a rearward-facing first wide-angle optical imaging system 30, which has a first short focal length that is shorter than the long focal length of the telephoto optical imaging system 20.

[0168] Referring to FIG26, in addition to the telephoto optical imaging system 20 and the first wide-angle optical imaging system 30, the portable electronic terminal 10 may be further equipped with a rearward-facing second wide-angle optical imaging system 40. The second wide-angle optical imaging system 40 has a second short focal length that is shorter than the telephoto optical imaging system 20 and different from the first short focal length of the first wide-angle optical imaging system 30.

[0169] Referring to Figure 27, in addition to the telephoto optical imaging system 20, the first wide-angle optical imaging system 30, and the second wide-angle optical imaging system 40, the portable electronic terminal 10 may be further equipped with a rearward-facing third wide-angle optical imaging system 50. The third wide-angle optical imaging system 50 has a third short focal length that is shorter than the telephoto optical imaging system 20, different from the first short focal length of the first wide-angle optical imaging system 30, and different from the second short focal length of the second wide-angle optical imaging system 40.

[0170] Referring to Figure 28, the telephoto optical imaging system 20, the first wide-angle optical imaging system 30, and the second wide-angle optical imaging system 40 are located in positions different from those shown in Figure 28.

[0171] In addition to the rear-facing optical imaging systems 20, 30, 40 and 50 shown in Figures 25 to 28, the portable electronic device 10 may be further equipped with a front-facing optical imaging system (not shown).

[0172] The above examples illustrate how to implement a long-focal-length optical imaging system that can be installed in a portable electronic device, i.e., a telephoto optical imaging system.

[0173] Although this disclosure includes specific examples, it will become 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 examples set forth herein are intended to be illustrative only and not for limiting purposes. The description of features or manner in each example is intended to be applicable to similar features or manner in other examples. Suitable results may be achieved if the described technology is implemented in a different order, and / or if components in the described system, architecture, apparatus, 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 defined by the detailed description but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are intended to be included in this disclosure.

[0174] 2θ: Angle 10: Portable electronic devices / portable electronic terminals 20: Optical Imaging System / Telephoto Optical Imaging System 30: Optical Imaging System / First Wide-Angle Optical Imaging System 40: Optical Imaging System / Second Wide-Angle Optical Imaging System 50: Optical Imaging System / Third Wide-Angle Optical Imaging System 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100: Optical Imaging System 110,210,310,410,510,610,710,810,910,1010,1110,L1: First lens 120, 220, 320, 420, 520, 620, 720, 820, 920, 1020, 1120: Second lens 130, 230, 330, 430, 530, 630, 730, 830, 930, 1030, 1130: Third lens 140, 240, 340, 440, 540, 640, 740, 840, 940, 1040, 1140: Fourth lens 150, 250, 350, 450, 550, 650, 750, 850, 950, 1050, 1150: Fifth lens 170, 270, 370, 470, 570, 670, 770, 870, 970, 1070, 1170: Filters 180, 280, 380, 480, 580, 680, 780, 880, 980, 1080, 1180: Image sensor 960: Sixth Lens C1: First optical axis C2: Optical axis / Second optical axis C3: Third optical axis IMG_HT: Half the length of the diagonal L1S1el: Effective radius / Effective radius of major axis L1S1es: Effective radius / Effective radius of minor axis P: Prism P1: First Prism P2: Second Prism SP: Gap Maintaining Member SPX1, SPX2, SPY1, SPY2: Length

Claims

1. An optical imaging system, comprising: A first lens, having a refractive power; a second lens, having a convex object-side surface; a third lens, having a positive refractive power; a fourth lens, having a convex image-side surface; and a fifth lens, having a convex object-side surface; wherein the first lens to the fifth lens are sequentially arranged along an optical axis from the object side towards an imaging plane; wherein the total number of lenses with refractive power in the optical imaging system is five; wherein the focal length of the first lens ranges from 7.0 mm to 18.0 mm; wherein the optical imaging system satisfies the following conditional expression: 0.8<TTL / f<1.0, wherein TTL is the distance from the object-side surface of the first lens to the imaging plane, and f is the focal length of the optical imaging system; and wherein the optical imaging system satisfies the following conditional expression: 2.8<f-number, wherein the f-number is the aperture value of the optical imaging system.

2. The optical imaging system according to claim 1, wherein the first lens has a convex object-side surface.

3. The optical imaging system according to claim 1, wherein the second lens has a concave image-side surface.

4. The optical imaging system according to claim 1, wherein the third lens has a convex object-side surface.

5. The optical imaging system according to claim 1, wherein the fourth lens has a concave object-side surface.

6. The optical imaging system according to claim 1, wherein the fifth lens has a concave image-side surface.

7. The optical imaging system according to claim 1, wherein the optical imaging system satisfies the following conditional expression: 0<D12 / f<0.05; wherein D12 is a distance along the optical axis from the image-side surface of the first lens to the object-side surface of the second lens.

8. The optical imaging system according to claim 1, wherein the optical imaging system satisfies the following conditional expression: 0.2<L1R1 / f<0.3; wherein L1R1 is a radius of curvature of the object-side surface of the first lens.

9. An optical imaging system, comprising: A first lens, having a refractive power; a second lens, having a concave object-side surface; a third lens, having a positive refractive power; a fourth lens, having a convex image-side surface; and a fifth lens, having a concave object-side surface and a convex image-side surface; wherein the first lens to the fifth lens are sequentially arranged along an optical axis from the object side towards an imaging plane; wherein the total number of lenses with refractive power in the optical imaging system is five; wherein the focal length of the first lens ranges from 7.0 mm to 18.0 mm; and wherein the optical imaging system satisfies the following conditional expressions: 0.8<TTL / f<1.0 and 0mm<f1+f2<32mm, wherein TTL is the distance from the object-side surface of the first lens to the imaging plane, f is the focal length of the optical imaging system, f1 is the focal length of the first lens, and f2 is the focal length of the second lens.

10. The optical imaging system according to claim 9, wherein the optical imaging system satisfies the following conditional expression: 3.2<Nd2+Nd3; wherein Nd2 is a refractive index of the second lens, and Nd3 is a refractive index of the third lens.

11. The optical imaging system of claim 9, wherein the optical imaging system satisfies the following conditional expression: 0D12 / f0.05; where D12 is the distance along the optical axis from the image-side surface of the first lens to the object-side surface of the second lens.

12. The optical imaging system of claim 9, wherein the optical imaging system satisfies the following conditional expression: 0.2L1R1 / f0.3; where L1R1 is the radius of curvature of the object-side surface of the first lens.

13. The optical imaging system of claim 9, wherein the fifth lens has a negative refractive power.

Images