Optical imaging system and portable electronic device

Abstract

An optical imaging system and a portable electronic device are disclosed. The optical imaging system includes, arranged in order from an object side toward an image side, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, wherein the first lens has a positive refractive power, and in two axes of the first lens that intersect an optical axis and are perpendicular to each other, a length of one axis is greater than a length of the other axis, wherein the following conditional expressions are satisfied: 4.5 < TTL / IMG HT < 6.5; 0.87 < TTL / f < 1.31; and 0.65 < L1S1es / L1S1el < 0.9, where TTL is a distance on the optical axis from an object side surface of the first lens to an imaging surface, IMG HT is half of a diagonal length of the imaging surface, f is a total focal length of the optical imaging system, L1S1el is a maximum effective radius of the object side surface of the first lens, and L1S1es is a minimum effective radius of the object side surface of the first lens.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2019-0107775, filed with the Korean Intellectual Property Office on August 30, 2019, the entire disclosure of which is incorporated herein by reference for all purposes. Technical Field

[0003] The following description relates to optical imaging systems. Background Technology

[0004] Cameras are already used in portable electronic devices such as smartphones. Due to the need for miniaturization in such portable electronic devices, there has been a demand for miniaturized cameras mounted on them.

[0005] In addition, telephoto cameras have been used in portable electronic devices to achieve zoom effects that capture objects with a relatively narrow field of view.

[0006] However, when multiple lenses are arranged in the thickness direction in a portable electronic device, the thickness of the portable electronic device can increase with the increase in the number of lenses. Therefore, this does not conform to the trend of miniaturization in portable electronic devices.

[0007] In particular, due to the relatively long focal length of telephoto cameras, there is a problem that they are difficult to apply to relatively thin portable electronic devices. Summary of the Invention

[0008] The summary portion of this invention is intended to provide a brief overview of the chosen inventive concepts, which will be further described in the detailed description portion below. This summary portion is not intended to identify key or essential features of the claimed subject matter, nor to help determine the scope of the claimed subject matter.

[0009] An optical imaging system is proposed that can be mounted on a portable electronic device with a relatively small thickness and a relatively long focal length.

[0010] In one aspect, an optical imaging system includes: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in sequence from the object side toward the image side, wherein the first lens has a positive refractive power, and among two axes of the first lens that intersect the optical axis and are perpendicular to each other, the length of one axis is greater than the length of the other axis, and the following conditional expressions are satisfied: 4.5 < TTL / IMG HT < 6.5; 0.87 < TTL / f < 1.31; and 0.65 < L1S1es / L1S1el < 0.9, where TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface, IMG HT is half of the diagonal length of the imaging surface, f is the total focal length of the optical imaging system, L1S1el is the maximum effective radius of the object side surface of the first lens, and L1S1es is the minimum effective radius of the object side surface of the first lens.

[0011] In a general aspect, an optical imaging system includes: a first lens with a positive refractive power, a second lens with a negative refractive power, a third lens with a refractive power, a fourth lens with a refractive power, and a fifth lens arranged in sequence along the optical axis from the object side; a first reflecting member disposed on the object side of the first lens; and a second reflecting member disposed on the image side of the fifth lens.

[0012] The first lens may include a convex object side surface.

[0013] The first lens may include a convex image side surface.

[0014] The second lens may include a concave image side surface.

[0015] The third lens may include a convex object side surface.

[0016] The fourth lens may include at least one concave surface.

[0017] The fifth lens may include a concave image side surface.

[0018] One or both of the first lens and the second lens may have a non-circular shape.

[0019] The optical imaging system may include a spacer disposed between the first lens and the second lens.

[0020] When observed in the optical axis direction, the first lens may include substantially parallel linear sides connecting the arcuate sides, and the optical imaging system may satisfy 50° < α < 92°, where α is the angle between a first virtual line and a second virtual line, the first virtual line connects the optical axis from a first connection point of one linear side and one arcuate side, and the second virtual line connects the optical axis from a second connection point of the one linear side and another arcuate side of the first lens.

[0021] The optical imaging system can satisfy FOV < 25°, where FOV is the field of view of the optical imaging system.

[0022] The optical imaging system can satisfy 0.9mm < DpL1 < 1.5mm, where DpL1 is the distance along the optical axis between the exit surface of the first prism and the object surface of the first lens.

[0023] The optical imaging system can satisfy 4.5 < TTL / IMG HT < 6.5, where TTL is the distance along the optical axis from the object side of the first lens to the imaging surface of the image sensor, and IMG HT is half the diagonal length of the imaging surface of the image sensor.

[0024] In another general aspect, the optical imaging system includes: a first lens having refractive power, a convex object-side surface, and a convex image-side surface, arranged sequentially from the object side along the optical axis; a second lens having refractive power and a concave image-side surface; a third lens having refractive power and a convex object-side surface; a fourth lens having refractive power; and a fifth lens having refractive power and a concave image-side surface; a first reflecting member disposed on the object side of the first lens to change the path of light such that light is guided toward the first lens; and a second reflecting member disposed on the image side of the fifth lens to change the path of light from the fifth lens such that light is guided toward an image sensor.

[0025] The first lens can have positive refractive power.

[0026] The second lens can have negative refractive power.

[0027] The fourth lens may have at least one recessed surface.

[0028] The fifth lens may have a convex object-side surface.

[0029] One or both of the first and second lenses may have a non-circular shape.

[0030] The optical imaging system can satisfy -0.7mm < f1 + f2 < 1.3mm, where f1 is the focal length of the first lens and f2 is the focal length of the second lens.

[0031] Other features and aspects will become apparent from the following detailed description, the accompanying drawings, and the appended claims. Attached Figure Description

[0032] Figure 1 It is a configuration diagram of the optical imaging system based on the first example.

[0033] Figure 2 It is shown Figure 1 The curves showing the aberration characteristics of the optical imaging system are shown.

[0034] Figure 3 It is a configuration diagram of the optical imaging system based on the second example.

[0035] Figure 4 It is shown Figure 3 The curves showing the aberration characteristics of the optical imaging system are shown.

[0036] Figure 5 It is a configuration diagram of the optical imaging system based on the third example.

[0037] Figure 6 It is shown Figure 5 The curves showing the aberration characteristics of the optical imaging system are shown.

[0038] Figure 7 It is a configuration diagram of the optical imaging system based on the fourth example.

[0039] Figure 8 It is shown Figure 7 The curves showing the aberration characteristics of the optical imaging system are shown.

[0040] Figure 9 It is a configuration diagram of the optical imaging system based on the fifth example.

[0041] Figure 10 It is shown Figure 9 The curves showing the aberration characteristics of the optical imaging system are shown.

[0042] Figure 11 It is a configuration diagram of the optical imaging system based on the sixth example.

[0043] Figure 12 It is shown Figure 11 The curves showing the aberration characteristics of the optical imaging system are shown.

[0044] Figure 13 It is a configuration diagram of the optical imaging system based on the seventh example.

[0045] Figure 14 It is shown Figure 13 The curves showing the aberration characteristics of the optical imaging system are shown.

[0046] Figure 15 This is a schematic three-dimensional diagram of an optical imaging system based on an example.

[0047] Figure 16 and Figure 17 It is a plan view of the first lens of the example optical imaging system.

[0048] Figure 18 It is a plan view of the first spacer ring of the example optical imaging system.

[0049] Figure 19 , Figure 20 , Figure 21 and Figure 22 This is a rear view of a portable electronic device equipped with a camera module.

[0050] Throughout the accompanying drawings and detailed embodiments, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative dimensions, scale, and depiction of elements in the drawings may be exaggerated. Detailed Implementation

[0051] The following detailed embodiments are provided to help readers gain a comprehensive understanding of the methods, apparatus, and / or systems described in this application. However, various changes, modifications, and equivalents to the methods, apparatus, and / or systems described in this application will be apparent to those skilled in the art. The order of operations described in this application is merely illustrative, and is not limited to the order set forth in this application, except for operations that must occur in a specific order, and can be changed, as will be apparent to those skilled in the art. Furthermore, for clarity and brevity, descriptions of functions and structures well-known to those skilled in the art may be omitted.

[0052] The features described in this application may be implemented in various forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art.

[0053] It should be noted that in this application, the term "may" is used in relation to examples or implementations, such as with regard to what an example or implementation may include or implement, meaning that there exists at least one example or implementation that includes or implements such features, and that all examples and implementations are not limited thereto.

[0054] Throughout this specification, when an element such as a layer, region, or substrate is described as being "on," "connected to," or "attached to" another element, the element may be directly "on," directly "connected to," or directly "attached to" the other element, or there may be one or more other elements between the element and the other element. Conversely, when an element is described as being "directly on," "directly connected to," or "directly attached to" another element, there may be no other elements between the element and the other element.

[0055] As used in this application, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0056] Although terms such as “first,” “second,” and “third” may be used in this application to describe various components, parts, regions, layers, or portions, these components, parts, regions, layers, or portions are not limited by these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or portion from another. Therefore, without departing from the teachings of the examples described in this application, the first component, first part, first region, first layer, or first portion mentioned in these examples may also be referred to as a second component, second part, second region, second layer, or second portion.

[0057] Spatial relative terms such as “above,” “above,” “below,” and “below” may be used in this application for descriptive convenience to describe the relationship of one element relative to another, as shown in the accompanying drawings. In addition to covering the orientation depicted in the drawings, these spatial relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “above” another element would be located “below” or “below” that other element. Thus, depending on the spatial orientation of the device, the term “above” covers both orientations of “above” and “below”. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used in this application should be interpreted accordingly.

[0058] The terminology used in this application is for describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the articles “a,” “an,” and “the” are intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the stated features, 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.

[0059] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described in this application are not limited to the specific shapes shown in the accompanying drawings, but include shape variations that may occur during manufacturing.

[0060] The features of the examples described in this application can be combined in various ways that will become apparent after understanding the disclosure of this application. Furthermore, although the examples described in this application have multiple configurations, other configurations that will become apparent after understanding the disclosure of this application are also possible.

[0061] The example will be described in detail below with reference to the accompanying drawings.

[0062] For example, those skilled in the art who understand the spirit of this disclosure may readily propose other examples that are included within the scope of the spirit of this disclosure by adding, changing or deleting components, and such proposals may be considered to be included within the scope of this disclosure.

[0063] Additionally, throughout this specification, unless otherwise expressly stated, the terms “comprising” or “including” mean that other elements may be included, rather than excluded.

[0064] In the lens configuration diagrams below, for illustrative purposes, the thickness, size, and shape of the lenses may be shown in an exaggerated manner to some extent, and specifically, the shapes of spherical or aspherical surfaces presented in the lens configuration diagrams are shown by way of example only and are not limited thereto.

[0065] An optical imaging system according to the example may include multiple lenses arranged along an optical axis. The multiple lenses may be spaced apart from each other by a predetermined distance along the optical axis.

[0066] As an example, an optical imaging system may include five lenses.

[0067] The first lens refers to the lens closest to the object side (or the reflecting component), while the fifth lens refers to the lens closest to the image sensor.

[0068] Furthermore, in each lens, the first surface (or object-side surface) refers to the surface adjacent to the object, while the second surface (or image-side surface) refers to the surface adjacent to the imaging surface. In this application, the values ​​for the radius of curvature, thickness, etc., of the lens are expressed in mm, and the unit of angle is degrees.

[0069] Furthermore, in the description of the shape of each lens, a convex shape of a surface indicates that the paraxial region of that surface is convex, while a concave shape of a surface indicates that the paraxial region of that surface is concave. Therefore, even when one surface of a lens is described as having a convex shape, the edge portion of the lens can be concave. Similarly, even when one surface of a lens is described as having a concave shape, the edge portion of the lens can be convex.

[0070] The paraxial region refers to a relatively narrow region near the optical axis.

[0071] The optical imaging system, according to the various examples, may include five lenses.

[0072] For example, an optical imaging system according to the example may include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially from the object side.

[0073] However, an optical imaging system can consist of more than just five lenses; it can also include other components.

[0074] For example, an optical imaging system may also include a reflective element with a reflective surface that alters the optical path. For example, the reflective element may be a mirror or a prism.

[0075] The reflecting member can be positioned closer to the object side than multiple lenses. For example, the reflecting member can be positioned closer to the object side than the first lens. Therefore, the lens positioned closest to the object side can be the lens positioned closest to the reflecting member.

[0076] In addition, the optical imaging system may also include an image sensor for converting an image of the incident object into an electrical signal.

[0077] Additionally, the optical imaging system may include an infrared cutoff filter (hereinafter referred to as a filter) for blocking infrared light. The filter is positioned between the image sensor and the lens closest to the image sensor (the fifth lens).

[0078] Alternatively, two reflective elements can be provided. In this case, one reflective element can be positioned closer to the object side than the first lens, while the other reflective element can be positioned between the fifth lens and the filter.

[0079] All lenses that make up an optical imaging system can be formed from plastic materials.

[0080] refer to Figure 15 and Figure 16 At least some lenses in an optical imaging system may have non-circular planar shapes. For example, at least one of the first lens L1 and the second lens L2 may be formed with a non-circular shape, while the remaining lenses may be formed with a circular shape. Alternatively, all lenses in an optical imaging system may be formed with non-circular shapes.

[0081] The term "non-circular shape" refers to a lens that is not circular in the area outside the gate of a plastic injection-molded lens.

[0082] A non-circular lens may have four side surfaces, and these four side surfaces may be formed to include two pairs of side surfaces, each pair including two side surfaces facing each other. In addition, the side surfaces facing each other may be configured to have corresponding shapes.

[0083] For example, when viewed along the optical axis, the first side surface 21 and the second side surface 22 of the first lens L1 can have an arcuate shape, and the third side surface 23 and the fourth side surface 24 can have a substantially linear shape (see...). Figure 15 The gate, which serves as a path for the resin material to move, can be formed on the first side surface 21 or the second side surface 22.

[0084] The third side surface 23 and the fourth side surface 24 can be connected to the first side surface 21 and the second side surface 22, respectively. In addition, the third side surface 23 and the fourth side surface 24 can be symmetrical about the optical axis and can be formed parallel to each other.

[0085] The term "circular shape" refers to a shape in which the gate of the plastic injection lens has been removed (i.e., a shape in which a portion of the circle has been cut off).

[0086] All lenses in an optical imaging system may include optical portions 10 and flange portions 30. Referring below... Figures 15 to 17 Describe the non-circular lens in detail.

[0087] The first lens L1 and the second lens L2 may have non-circular shapes, but are not limited to this, and all lenses may have non-circular shapes.

[0088] For ease of description, only the first lens L1 will be described below.

[0089] The optical section 10 may be the part that exhibits the optical performance of the first lens L1. For example, light reflected from an object may be refracted as it passes through the optical section 10.

[0090] The optical part 10 may have refractive power and may have an aspherical shape.

[0091] Additionally, the optical component 10 may include an object-side surface (the surface facing the object) and an image-side surface (the surface facing the imaging plane). Figure 16 (as shown in the image).

[0092] The flange portion 30 may be the portion that secures the first lens L1 to another configuration (e.g., the lens barrel or the second lens L2).

[0093] The flange portion 30 may extend around at least a portion of the optical portion 10 and may be integrally formed with the optical portion 10.

[0094] The optical portion 10 and the flange portion 30 can be formed to have non-circular shapes. For example, when viewed in the direction of the optical axis, the optical portion 10 and the flange portion 30 can be non-circular (see...). Figure 16 and Figure 17 In contrast, the optical portion 10 can be formed to have a circular shape, while the flange portion 30 can be formed to have a non-circular shape.

[0095] The optical portion 10 may include a first edge 11, a second edge 12, a third edge 13, and a fourth edge 14, wherein the first edge 11 and the second edge 12 may be positioned facing each other, and the third edge 13 and the fourth edge 14 may be positioned facing each other.

[0096] The third edge 13 and the fourth edge 14 can connect to the first edge 11 and the second edge 12, respectively.

[0097] When viewed along the optical axis, the first edge 11 and the second edge 12 can have an arcuate shape, and the third edge 13 and the fourth edge 14 can have a generally linear shape. The third edge 13 and the fourth edge 14 can be formed symmetrically about the optical axis and can be formed parallel to each other.

[0098] The optical part 10 may have a major axis (a) and a minor axis (b). For example, when viewed in the direction of the optical axis, the line segment that connects the third edge 13 and the fourth edge 14 with the shortest distance while passing through the optical axis may be the minor axis (b), while the line segment that connects the first edge 11 and the second edge 12 while passing through the optical axis and perpendicular to the minor axis (b) may be the major axis (a).

[0099] In this case, half of the major axis (a) can be the maximum effective radius, while half of the minor axis (b) can be the minimum effective radius.

[0100] The flange portion 30 may include a first flange portion 31 and a second flange portion 32. The first flange portion 31 may extend from a first edge 11 of the optical portion 10, and the second flange portion 32 may extend from a second edge 12 of the optical portion 10.

[0101] The first edge 11 of the optical portion 10 may refer to the portion adjacent to the first flange portion 31, while the second edge 12 of the optical portion 10 may refer to the portion adjacent to the second flange portion 32.

[0102] The third edge 13 of the optical portion 10 may refer to a side surface of the optical portion 10 on which the flange portion 30 is not formed, while the fourth edge 14 of the optical portion 10 may refer to the other side surface of the optical portion 10 on which the flange portion 30 is not formed.

[0103] The first lens L1 can be formed from a plastic material and can be injection molded. In this case, the third edge 13 and the fourth edge 14 of the first lens L1 can be formed in such a shape during injection molding, rather than by cutting a portion of the lens after injection molding.

[0104] When a portion of the lens is removed after injection molding, the lens may deform due to the forces applied to it. When the lens is deformed, its optical properties change, which can be problematic.

[0105] However, in the first lens L1 according to the example, since the first lens L1 is formed to have a non-circular shape during injection molding, the size of the first lens L1 can be reduced while ensuring the performance of the first lens L1.

[0106] In this example, the effective radius of the non-circular lens can be made larger than the effective radius of other lenses.

[0107] The effective radius refers to the radius through which light actually passes on one of the surfaces of each lens (object side and image side). For example, the effective radius refers to the radius of the optical portion of each lens.

[0108] Since the first lens L1 is non-circular, the effective radius of the first lens L1 can have a maximum effective radius and a minimum effective radius. The maximum effective radius corresponds to half of the virtual straight line connecting the first edge 11 and the second edge 12 when passing through the optical axis, and the minimum effective radius corresponds to half of the virtual straight line connecting the third edge 13 and the fourth edge 14 when passing through the optical axis.

[0109] refer to Figure 17 A first virtual line connecting the optical axis from the connection point between the first edge 11 of the non-circular lens and one of the edges of the fourth edge 14 and the third edge 13 can be defined as P1, a second virtual line connecting the optical axis from the connection point between the second edge 12 of the non-circular lens and said one of the edges of the fourth edge 14 and the third edge 13 can be defined as P2, and the angle between the two virtual lines can be defined as α.

[0110] Each of the multiple lenses may have at least one aspherical surface.

[0111] For example, at least one of the first and second surfaces of each of the first to fifth lenses can be an aspherical surface. In this case, the aspherical surface of the first to fifth lenses is represented by the following Equation 1.

[0112] Equation 1:

[0113]

[0114] In Equation 1, c is the curvature of the lens (the reciprocal of the radius of curvature), K is the conic constant, and Y is the distance from any point on the aspherical surface of the lens to the optical axis. Additionally, constants A through E are aspherical coefficients. Z represents the distance (SAG) from any point on the aspherical surface of the lens to the vertex of the aspherical surface along the optical axis.

[0115] The optical imaging systems described in the examples can satisfy at least one of the following conditional expressions:

[0116] Conditional expression 1: 0.65 <L1S1es / L1S1el<0.9

[0117] Conditional expression 2: 0.65 <L1S2es / L1S2el<0.9

[0118] Conditional expression 3: 0.7 <L2S1es / L2S1el<0.9

[0119] Conditional expression 4: 0.7 <L2S2es / L2S2el<1.0

[0120] Conditional expression 5: 0.9mm <DpL1<1.5mm

[0121] Conditional expression 6: 15.0mm <PTTL<25.0mm

[0122] Conditional expression 7: 0.7 <s1es / s1el<0.9

[0123] Conditional expression 8: 0.8 <L1S1el / IMG HT<1.2

[0124] Conditional expression 9:0 <L1S1el / PTTL<0.2

[0125] Conditional expression 10:0 <L1S1es / PTTL<0.15

[0126] Conditional expression 11: 0 <L2S1el / PTTL<0.17

[0127] Conditional expression 12: 0 <L2S1es / PTTL<0.14

[0128] Conditional expression 13: 0 <AL1 / (PTTL) 2 <0.09

[0129] Conditional expression 14: 50° < α < 92°

[0130] Conditional expression 15: 1.3 < α / (2*FOV) < 2.2

[0131] Conditional expression 16: 0.9 <BFL / (2*IMG HT)<3.0

[0132] Conditional expression 17: 2.4 ≤ Fno < 5

[0133] Conditional expression 18: 1.3 <L1S1el / L5S2el<1.7

[0134] Conditional expression 19: 1.3 <L1S1el / L3S1el<1.7

[0135] Conditional expression 20: 0.8 <L3S1el / L5S1el<1.2

[0136] Conditional expression 21: -0.7mm <f1+f2<1.3mm

[0137] Conditional expression 22: 0.87 <TTL / f<1.31

[0138] Conditional expression 23: 4.5 <TTL / IMG HT<6.5

[0139] Conditional expression 24: 0.5 <L1S1es / IMG HT<1.1

[0140] Conditional expression 25: 0.5 <L3S1el / IMG HT<1.1

[0141] Conditional expression 26: 0.5 <L5S2el / IMG HT<1.3

[0142] Conditional expression 27: 1.1 <sumCT / sumET<1.4

[0143] Conditional expression 28: 1.3 < (CT5 / ET5) * L5S1el < 2.5

[0144] Conditional expression 29: -0.2 <SAG51 / IMG HT<0.2

[0145] Conditional expression 30: -0.1 <SAG52 / IMG HT<0.1

[0146] Conditional expression 31: FOV < 25°

[0147] In the conditional expression, L1S1el is the maximum effective radius of the object-side surface of the first lens, L1S1es is the minimum effective radius of the object-side surface of the first lens, L1S2el is the maximum effective radius of the image-side surface of the first lens, and L1S2es is the minimum effective radius of the image-side surface of the first lens.

[0148] In the conditional expression, L2S1el is the maximum effective radius of the object-side surface of the second lens, L2S1es is the minimum effective radius of the object-side surface of the second lens, L2S2el is the maximum effective radius of the image-side surface of the second lens, and L2S2es is the minimum effective radius of the image-side surface of the second lens.

[0149] In the conditional expression, L3S1el is the maximum effective radius of the object side of the third lens, and L5S2el is the maximum effective radius of the image side of the fifth lens.

[0150] In the conditional expression, DpL1 is the distance along the optical axis between the exit surface of the prism and the object surface of the first lens, TTL is the distance along the optical axis from the object surface of the first lens to the imaging surface of the image sensor, and PTTL is the distance along the optical axis from the reflecting surface of the prism to the imaging surface of the image sensor.

[0151] In the conditional expression, s1el is the maximum radius of the opening of the spacer between the first lens and the second lens, and s1es is the minimum radius of the opening of the spacer between the first lens and the second lens.

[0152] In the conditional expression, IMG HT is half the diagonal length of the imaging plane of the image sensor.

[0153] In the conditional expression, AL1 is the area of ​​the optical portion of the object-side surface of the first lens. In this case, the area refers to the area of ​​the plane observed when viewing the first lens along the optical axis (see...). Figure 16 ).

[0154] In the conditional expression, α is the angle between the first virtual line P1 and the second virtual line P2. The first virtual line P1 connects the optical axis (Z-axis) from the connection point of the first side surface 21 and the fourth side surface 24 of the first lens, and the second virtual line P2 connects the optical axis (Z-axis) from the connection point of the second side surface 22 and the fourth side surface 24 of the first lens.

[0155] In the conditional expression, FOV is the field of view of the optical imaging system, f is the total focal length of the optical imaging system, and BFL is the distance along the optical axis from the image side of the lens closest to the image sensor to the imaging surface of the image sensor.

[0156] In the conditional expression, Fno is the F-number of the optical imaging system.

[0157] In the conditional expression, f1 is the focal length of the first lens, and f2 is the focal length of the second lens.

[0158] In the conditional expression, sumCT is the sum of the thicknesses of the first to fifth lenses along the optical axis, and sumET is the sum of the edge thicknesses of the first to fifth lenses. In this case, the edge of the lens refers to the end of the optical portion.

[0159] In the conditional expression, CT5 is the thickness of the fifth lens on the optical axis, and ET5 is the edge thickness of the fifth lens.

[0160] In the conditional expression, SAG51 is the SAG value at the edge of the object side of the fifth lens, and SAG52 is the SAG value at the edge of the image side of the fifth lens.

[0161] Next, the first to fifth lenses constituting the optical imaging system according to the various examples will be described.

[0162] The first lens can have positive refractive power. Furthermore, both surfaces of the first lens can be convex. For example, the first and second surfaces of the first lens can be convex.

[0163] In the first lens, at least one of the first and second surfaces can be aspherical. For example, both surfaces of the first lens can be aspherical.

[0164] The second lens can have negative refractive power. Additionally, the second lens can have a meniscus shape that convexes towards the object side. For example, the first surface of the second lens can be convex, and the second surface can be concave.

[0165] Alternatively, both surfaces of the second lens can be concave. For example, the first and second surfaces of the second lens can be concave.

[0166] In the second lens, at least one of the first and second surfaces can be aspherical. For example, both surfaces of the second lens can be aspherical.

[0167] The third lens can have positive or negative refractive power. Additionally, the third lens can have a meniscus shape that convexes towards the object side. For example, the first surface of the third lens can be convex, and the second surface can be concave.

[0168] Alternatively, the third lens may have a convex shape on both sides. For example, the first and second surfaces of the third lens may be convex.

[0169] In the third lens, at least one of the first and second surfaces can be aspherical. For example, both surfaces of the third lens can be aspherical.

[0170] The fourth lens can have positive or negative refractive power. Additionally, the fourth lens can have a meniscus shape that convexes towards the object side. For example, the first surface of the fourth lens can be convex, and the second surface can be concave.

[0171] Alternatively, both surfaces of the fourth lens can be concave. For example, the first and second surfaces of the fourth lens can be concave.

[0172] Alternatively, the fourth lens may have a meniscus shape that convexes toward the image side. For example, the first surface of the fourth lens may be concave, and the second surface of the fourth lens may be convex.

[0173] In the fourth lens, at least one of the first and second surfaces can be aspherical. For example, both surfaces of the fourth lens can be aspherical.

[0174] The fifth lens can have positive or negative refractive power. Additionally, the fifth lens can have a meniscus shape that convexes towards the object side. For example, the first surface of the fifth lens can be convex, and the second surface can be concave.

[0175] In the fifth lens, at least one of the first and second surfaces can be aspherical. For example, both surfaces of the fifth lens can be aspherical.

[0176] The optical imaging systems described in the examples are characterized by telephoto lenses with relatively narrow field of view and relatively long focal length.

[0177] Reference Figure 1 and Figure 2 Describe the optical imaging system according to the first example.

[0178] The optical imaging system 100 includes an optical system comprising a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, and a fifth lens 150, and may also include a filter 160 and an image sensor 170.

[0179] It may also include a first reflecting member R1, which is positioned closer to the object side than the first lens 110 and has a reflective surface that alters the light path. It may also include a second reflecting member R2, which is positioned between the fifth lens 150 and the filter 160 and has a reflective surface that alters the light path. The first reflecting member R1 and the second reflecting member R2 can be prisms, but they can also be mirrors.

[0180] Light incident on the first reflecting member R1 can be bent by the first reflecting member R1 to pass through the first lens 110 to the fifth lens 150.

[0181] Light passing through the first lens 110 to the fifth lens 150 can be bent by the second reflective member R2 and can be received by the image sensor 170.

[0182] Table 1 below shows the lens characteristics (radius of curvature, lens thickness or distance between lenses, refractive index, Abbe number, focal length) for each lens.

[0183] Table 1

[0184]

[0185] In the optical imaging system 100, the total focal length f is 15.5mm, Fno is 2.96, IMG HT is 2.48mm, FOV is 17.86°, α is 67.26°, and AL1 is 21.068mm. 2The BFL is 6.894mm, the TTL is 15.016mm, and the PTTL is 18.5855mm. The edge thickness of the fifth lens 150 is 1.02mm, the SAG value SAG51 of the object side of the fifth lens 150 is 0.02mm, and the SAG value SAG52 of the image side of the fifth lens 150 is 0.1mm.

[0186] The focal length of the first lens 110 is 4.80967mm, the focal length of the second lens 120 is -3.62625mm, the focal length of the third lens 130 is 7.4794mm, the focal length of the fourth lens 140 is -19.4173mm, and the focal length of the fifth lens 150 is -25.8321mm.

[0187] In the optical imaging system 100, the first lens 110 has positive refractive power, and the first and second surfaces of the first lens 110 are convex.

[0188] The second lens 120 has negative refractive power, and the first and second surfaces of the second lens 120 are concave.

[0189] The third lens 130 has positive refractive power, and the first and second surfaces of the third lens 130 are convex.

[0190] The fourth lens 140 has negative refractive power, with its first surface being concave and its second surface being convex.

[0191] The fifth lens 150 has negative refractive power, the first surface of the fifth lens 150 is convex, and the second surface of the fifth lens 150 is concave.

[0192] As shown in Table 2, each surface of the first lens 110 to the fifth lens 150 has an aspherical surface coefficient. For example, both the object-side surface and the image-side surface of the first lens 110 to the fifth lens 150 are aspherical surfaces.

[0193] Table 2

[0194] K A B C D E S4 -7.61E-01 6.62E-04 8.60E-05 -3.00E-06 1.00E-06 -1.14E-07 S5 0 4.55E-03 -1.50E-04 -1.60E-05 3.00E-06 -1.36E-07 S6 0 -2.46E-03 4.41E-04 -4.70E-05 6.00E-06 -2.89E-07 S7 0 -1.45E-02 1.79E-03 -5.00E-04 8.60E-05 -1.30E-05 S8 0 -8.32E-03 2.58E-03 -7.44E-04 1.02E-04 -1.40E-05 S9 0 -8.68E-03 3.34E-03 -1.25E-03 1.59E-04 -7.00E-06 S10 0 1.55E-02 -3.86E-03 -1.73E-03 3.92E-04 -1.70E-05 S11 0 2.12E-02 -4.00E-03 1.44E-04 3.32E-04 -1.13E-04 S12 0 -2.45E-02 3.35E-03 2.20E-03 -4.85E-04 -3.90E-05 S13 0 -2.48E-02 5.47E-03 -6.46E-04 -2.00E-05 1.10E-05

[0195] Furthermore, the optical system configured as described above can have, for example... Figure 2 The aberration characteristics shown are illustrated.

[0196] Reference Figure 3 and Figure 4 Describe the optical imaging system according to the second example.

[0197] The optical imaging system 200 may include an optical system comprising a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, and a fifth lens 250, and may also include a filter 260 and an image sensor 270.

[0198] It may also include a reflective member R, which is positioned closer to the object side than the first lens 210 and has a reflective surface that alters the light path. The reflective member R may be a prism, but it may also be a mirror.

[0199] Light incident on the reflecting member R can be bent by the reflecting member R to pass through the first lens 210 to the fifth lens 250.

[0200] Table 3 below shows the lens characteristics of each lens (radius of curvature, lens thickness or distance between lenses, refractive index, Abbe number, focal length).

[0201] Table 3

[0202]

[0203]

[0204] In the optical imaging system 200, the total focal length f is 16mm, Fno is 2.96, IMG HT is 2.822mm, FOV is 18.3°, α is 56.004°, and AL1 is 21.821mm. 2 The BFL is 7.281mm, the TTL is 15mm, and the PTTL is 18.57mm. The edge thickness of the fifth lens 250 is 0.91mm, the SAG value SAG51 of the object side of the fifth lens 250 is 0.13mm, and the SAG value SAG52 of the image side of the fifth lens 250 is 0.26mm.

[0205] The focal length of the first lens 210 is 5.23686mm, the focal length of the second lens 220 is -3.96715mm, the focal length of the third lens 230 is 9.37747mm, the focal length of the fourth lens 240 is -49.9896mm, and the focal length of the fifth lens 250 is -36.0501mm.

[0206] The first lens 210 has positive refractive power, and the first and second surfaces of the first lens 210 are convex.

[0207] The second lens 220 has negative refractive power, and the first and second surfaces of the second lens 220 are concave.

[0208] The third lens 230 has positive refractive power, with its first surface being convex and its second surface being concave.

[0209] The fourth lens 240 has negative refractive power, with its first surface being concave and its second surface being convex.

[0210] The fifth lens 250 has negative refractive power, the first surface of the fifth lens 250 is convex, and the second surface of the fifth lens 250 is concave.

[0211] As shown in Table 4, each surface of the first lens 210 to the fifth lens 250 has an aspherical surface coefficient. For example, both the object-side surface and the image-side surface of the first lens 210 to the fifth lens 250 are aspherical surfaces.

[0212] Table 4

[0213] K A B C D E S4 -7.71E-01 6.38E-04 1.00E-04 -9.00E-06 2.00E-06 -1.38E-07 S5 0 4.43E-03 -2.25E-04 -1.90E-05 3.00E-06 -8.74E-08 S6 0 -2.82E-03 4.10E-04 -5.80E-05 6.00E-06 -1.93E-07 S7 0 -1.34E-02 1.34E-03 -4.04E-04 9.20E-05 -9.00E-06 S8 0 -8.91E-03 2.81E-03 -8.13E-04 1.20E-04 -8.00E-06 S9 0 -9.23E-03 3.66E-03 -1.21E-03 1.61E-04 -7.00E-06 S10 0 1.71E-02 -2.51E-03 -2.38E-04 3.00E-06 1.00E-05 S11 0 1.75E-02 -1.94E-03 1.51E-04 -6.40E-05 8.00E-06 S12 0 -2.41E-02 2.39E-03 2.78E-04 -1.47E-04 8.00E-06 S13 0 -2.69E-02 3.80E-03 -3.71E-04 -2.60E-05 4.00E-06

[0214] Furthermore, the optical system configured as described above can have, for example... Figure 4 The aberration characteristics shown are illustrated.

[0215] Reference Figure 5 and Figure 6 Describe the optical imaging system according to the third example.

[0216] The optical imaging system 300 may include an optical system comprising a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, and a fifth lens 350, and may also include a filter 360 and an image sensor 370.

[0217] It may also include a reflective member R, which is positioned closer to the object side than the first lens 310 and has a reflective surface that alters the light path. The reflective member R may be a prism, but it may also be a mirror.

[0218] Light incident on the reflective member R can be bent by the reflective member R to pass through the first lens 310 to the fifth lens 350.

[0219] Table 5 below shows the lens characteristics of each lens (radius of curvature, lens thickness or distance between lenses, refractive index, Abbe number, focal length).

[0220] Table 5

[0221]

[0222]

[0223] In the optical imaging system 300, the total focal length f is 15.6 mm, Fno is 2.87, IMG HT is 3.136 mm, FOV is 21.1°, α is 75.011°, and AL1 is 20.704 mm. 2 The BFL is 7.316mm, the TTL is 14.5mm, and the PTTL is 17.75mm. The edge thickness of the fifth lens 350 is 0.41mm, the SAG value SAG51 of the object side of the fifth lens 350 is 0.35mm, and the SAG value SAG52 of the image side of the fifth lens 350 is 0.23mm.

[0224] The focal length of the first lens 310 is 5.2118mm, the focal length of the second lens 320 is -4.43632mm, the focal length of the third lens 330 is 6.44006mm, the focal length of the fourth lens 340 is -5.87135mm, and the focal length of the fifth lens 350 is 23.5364mm.

[0225] The first lens 310 has positive refractive power, and the first and second surfaces of the first lens 310 are convex.

[0226] The second lens 320 has negative refractive power, and the first and second surfaces of the second lens 320 are concave.

[0227] The third lens 330 has positive refractive power, and the first and second surfaces of the third lens 330 are convex.

[0228] The fourth lens 340 has negative refractive power, the first surface of the fourth lens 340 is convex, and the second surface of the fourth lens 340 is concave.

[0229] The fifth lens 350 has positive refractive power, the first surface of the fifth lens 350 is convex, and the second surface of the fifth lens 350 is concave.

[0230] As shown in Table 6, each surface of the first lens 310 to the fifth lens 350 has an aspherical surface coefficient. For example, both the object-side surface and the image-side surface of the first lens 310 to the fifth lens 350 are aspherical surfaces.

[0231] Table 6

[0232]

[0233]

[0234] Furthermore, the optical system configured as described above can have, for example... Figure 6 The aberration characteristics shown are illustrated.

[0235] Reference Figure 7 and Figure 8Describe the optical imaging system according to the fourth example.

[0236] The optical imaging system 400 may include an optical system comprising a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, and a fifth lens 450, and may also include a filter 460 and an image sensor 470.

[0237] It may also include a reflective member R, which is positioned closer to the object side than the first lens 410 and has a reflective surface that alters the light path. The reflective member R may be a prism, but it may also be a mirror.

[0238] Light incident on the reflecting member R can be bent by the reflecting member R to pass through the first lens 410 to the fifth lens 450.

[0239] Table 7 below shows the lens characteristics of each lens (radius of curvature, lens thickness or distance between lenses, refractive index, Abbe number, focal length).

[0240] Table 7

[0241]

[0242] In the optical imaging system 400, the total focal length f is 16mm, Fno is 2.87, IMG HT is 3.136mm, FOV is 20.6°, α is 72.479°, and AL1 is 20.939mm. 2 The BFL is 6.816mm, the TTL is 14.4mm, and the PTTL is 17.65mm. The edge thickness of the fifth lens 450 is 0.4mm, the SAG value SAG51 of the object side of the fifth lens 450 is 0.24mm, and the SAG value SAG52 of the image side of the fifth lens 450 is 0.16mm.

[0243] The focal length of the first lens 410 is 5.01429mm, the focal length of the second lens 420 is -4.52334mm, the focal length of the third lens 430 is 6.55033mm, the focal length of the fourth lens 440 is -6.10629mm, and the focal length of the fifth lens 450 is 53.9555mm.

[0244] The first lens 410 has positive refractive power, and the first and second surfaces of the first lens 410 are convex.

[0245] The second lens 420 has negative refractive power, and the first and second surfaces of the second lens 420 are concave.

[0246] The third lens 430 has positive refractive power, and the first and second surfaces of the third lens 430 are convex.

[0247] The fourth lens 440 has negative refractive power, the first surface of the fourth lens 440 is convex, and the second surface of the fourth lens 440 is concave.

[0248] The fifth lens 450 has positive refractive power, the first surface of the fifth lens 450 is convex, and the second surface of the fifth lens 450 is concave.

[0249] As shown in Table 8, each surface of the first lens 410 to the fifth lens 450 has an aspherical surface coefficient. For example, both the object-side surface and the image-side surface of the first lens 410 to the fifth lens 450 are aspherical surfaces.

[0250] Table 8

[0251] K A B C D E S4 -6.33E-01 9.59E-04 1.22E-04 -1.00E-06 1.00E-06 5.32E-09 S5 0 3.05E-03 -2.00E-06 3.63E-07 -2.00E-06 1.33E-07 S6 0 -5.64E-03 7.84E-04 -5.90E-05 3.00E-06 -2.41E-08 S7 0 -1.01E-02 6.02E-04 -2.00E-04 5.50E-05 -2.00E-06 S8 0 -7.36E-03 1.41E-03 -2.06E-04 -1.50E-05 1.00E-05 S9 0 -1.16E-02 2.46E-03 -3.86E-04 5.00E-06 6.00E-06 S10 0 -1.17E-02 4.20E-05 7.72E-04 -1.90E-04 1.10E-05 S11 0 -1.07E-02 1.04E-03 8.23E-04 -5.60E-05 -1.20E-05 S12 0 -1.98E-02 1.84E-03 5.42E-04 6.00E-06 -6.00E-06 S13 0 -1.94E-02 1.69E-03 4.30E-04 -4.40E-05 8.00E-06

[0252] Furthermore, the optical system configured as described above can have, for example... Figure 8 The aberration characteristics shown are illustrated.

[0253] Reference Figure 9 and Figure 10 Describe the optical imaging system according to the fifth example.

[0254] The optical imaging system 500 may include an optical system comprising a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, and a fifth lens 550, and may also include a filter 560 and an image sensor 570.

[0255] It may also include a reflective member R, which is positioned closer to the object side than the first lens 510 and has a reflective surface that alters the light path. The reflective member R may be a prism, but it may also be a mirror.

[0256] Light incident on the reflective member R can be bent by the reflective member R to pass through the first lens 510 to the fifth lens 550.

[0257] Table 9 below shows the lens characteristics (radius of curvature, lens thickness or distance between lenses, refractive index, Abbe number, focal length) for each lens.

[0258] Table 9

[0259]

[0260] In the optical imaging system 500, the total focal length f is 16.2 mm, Fno is 2.98 mm, IMG HT is 3.137 mm, FOV is 20.3°, α is 57.667°, and AL1 is 22.048 mm. 2The BFL is 6.017mm, the TTL is 14.2mm, and the PTTL is 17.2mm. The edge thickness of the fifth lens 550 is 0.52mm, the SAG value SAG51 of the object side of the fifth lens 550 is -0.5mm, and the SAG value SAG52 of the image side of the fifth lens 550 is -0.25mm.

[0261] The focal length of the first lens 510 is 4.78929mm, the focal length of the second lens 520 is -5.21141mm, the focal length of the third lens 530 is 6.20563mm, the focal length of the fourth lens 540 is -5.82674mm, and the focal length of the fifth lens 550 is -37.5441mm.

[0262] The first lens 510 has positive refractive power, and the first and second surfaces of the first lens 510 are convex.

[0263] The second lens 520 has negative refractive power, and the first and second surfaces of the second lens 520 are concave.

[0264] The third lens 530 has positive refractive power, and the first and second surfaces of the third lens 530 are convex.

[0265] The fourth lens 540 has negative refractive power, and the first and second surfaces of the fourth lens 540 are concave.

[0266] The fifth lens 550 has negative refractive power, the first surface of the fifth lens 550 is convex, and the second surface of the fifth lens 550 is concave.

[0267] As shown in Table 10, each surface of the first lens 510 to the fifth lens 550 has an aspherical surface coefficient. For example, both the object-side surface and the image-side surface of the first lens 510 to the fifth lens 550 are aspherical surfaces.

[0268] Table 10

[0269] K A B C D E S4 -7.02E-01 7.54E-04 9.10E-05 -1.52E-07 1.00E-06 9.92E-09 S5 0 3.25E-03 1.08E-04 5.00E-06 -2.00E-06 1.34E-07 S6 0 -4.56E-03 8.50E-04 -5.70E-05 3.00E-06 -1.02E-07 S7 0 -8.87E-03 5.02E-04 -1.38E-04 3.10E-05 -1.00E-06 S8 0 -8.73E-03 9.33E-04 -3.23E-04 -4.80E-05 7.00E-06 S9 0 -1.13E-02 1.93E-03 -4.00E-04 1.60E-05 3.81E-08 S10 0 -1.14E-02 2.52E-04 8.12E-04 -1.78E-04 1.50E-05 S11 0 -1.08E-02 3.29E-04 7.71E-04 -2.20E-04 2.10E-05 S12 0 -4.46E-02 1.10E-03 4.91E-04 -1.38E-04 4.49E-07 S13 0 -4.17E-02 3.28E-03 1.25E-04 -1.04E-04 8.00E-06

[0270] Furthermore, the optical system configured as described above can have, for example... Figure 10 The aberration characteristics shown are illustrated.

[0271] Reference Figure 11 and Figure 12 Describe the optical imaging system according to the sixth example.

[0272] The optical imaging system 600 may include an optical system comprising a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, and a fifth lens 650, and may also include a filter 660 and an image sensor 670.

[0273] The lens may also include a first reflecting member R1, which is positioned closer to the object side than the first lens 610 and has a reflective surface that alters the light path. It may also include a second reflecting member R2, which is disposed between the fifth lens 650 and the filter 660 and has a reflective surface that alters the light path. In a sixth embodiment of this disclosure, the first reflecting member R1 and the second reflecting member R2 may be prisms, but they may also be mirrors.

[0274] Light incident on the first reflecting member R1 can be bent by the first reflecting member R1 to pass through the first lens 610 to the fifth lens 650.

[0275] Light passing through the first lens 610 to the fifth lens 650 can be bent by the second reflective member R2 and can be received by the image sensor 670.

[0276] The lens characteristics (radius of curvature, lens thickness or distance between lenses, refractive index, Abbe number, focal length) of each lens are shown in Table 11 below.

[0277] Table 11

[0278]

[0279] In the optical imaging system 600, the total focal length f is 15.5mm, Fno is 2.87, IMG HT is 3.135mm, FOV is 22.9°, α is 91.957°, and AL1 is 18.763mm. 2 The BFL is 8.511mm, the TTL is 16.710mm, and the PTTL is 20.280mm. The edge thickness of the fifth lens 650 is 0.76mm, the SAG value SAG51 of the object side of the fifth lens 650 is -0.16mm, and the SAG value SAG52 of the image side of the fifth lens 650 is 0.09mm.

[0280] The focal length of the first lens 610 is 7.03226mm, the focal length of the second lens 620 is -5.73353mm, the focal length of the third lens 630 is 29.0425mm, the focal length of the fourth lens 640 is 13.9773mm, and the focal length of the fifth lens 650 is -21.2029mm.

[0281] The first lens 610 has positive refractive power, and the first and second surfaces of the first lens 610 are convex.

[0282] The second lens 620 has negative refractive power, with its first surface being convex and its second surface being concave.

[0283] The third lens 630 has positive refractive power, with its first surface being convex and its second surface being concave.

[0284] The fourth lens 640 has positive refractive power, the first surface of the fourth lens 640 is convex, and the second surface of the fourth lens 640 is concave.

[0285] The fifth lens 650 has negative refractive power, the first surface of the fifth lens 650 is convex, and the second surface of the fifth lens 650 is concave.

[0286] As shown in Table 12, each surface of the first lens 610 to the fifth lens 650 has an aspherical surface coefficient. For example, both the object-side surface and the image-side surface of the first lens 610 to the fifth lens 650 are aspherical surfaces.

[0287] Table 12

[0288] K A B C D E S4 -5.99E-01 1.17E-03 9.20E-05 -3.00E-06 1.00E-06 -5.77E-08 S5 0 2.51E-03 3.00E-06 1.00E-06 -2.00E-06 9.57E-08 S6 0 -5.55E-03 7.62E-04 -5.90E-05 3.00E-06 -1.67E-07 S7 0 -1.12E-02 7.99E-04 -2.20E-04 4.10E-05 -3.00E-06 S8 0 -8.23E-03 1.36E-03 -2.00E-04 -1.30E-05 4.00E-06 S9 0 -1.22E-02 2.93E-03 -3.07E-04 -2.80E-05 9.00E-06 S10 0 -1.16E-02 2.92E-04 6.93E-04 -1.42E-04 1.20E-05 S11 0 -1.27E-02 8.68E-04 8.21E-04 -1.94E-04 1.20E-05 S12 0 -1.82E-02 1.30E-03 3.19E-04 -1.19E-04 -2.00E-06 S13 0 -1.39E-02 7.26E-04 2.36E-04 -1.16E-04 1.00E-05

[0289] Furthermore, the optical system configured as described above can have, for example... Figure 12 The aberration characteristics shown are illustrated.

[0290] Reference Figure 13 and Figure 14 Describe the optical imaging system according to the seventh example.

[0291] The optical imaging system 700 may include an optical system comprising a first lens 710, a second lens 720, a third lens 730, a fourth lens 740, and a fifth lens 750, and may also include a filter 760 and an image sensor 770.

[0292] It may also include a first reflecting member R1, which is positioned closer to the object side than the first lens 710 and has a reflective surface that alters the light path. It may also include a second reflecting member R2, which is disposed between the fifth lens 750 and the filter 760 and has a reflective surface that alters the light path. The first reflecting member R1 and the second reflecting member R2 can be prisms, but they can also be mirrors.

[0293] Light incident on the first reflecting member R1 can be bent by the first reflecting member R1 to pass through the first lens 710 to the fifth lens 750.

[0294] Light passing through the first lens 710 to the fifth lens 750 can be bent by the second reflective member R2 and can be received by the image sensor 770.

[0295] The lens characteristics (radius of curvature, lens thickness or distance between lenses, refractive index, Abbe number, focal length) of each lens are shown in Table 13 below.

[0296] Table 13

[0297]

[0298] In the optical imaging system 700, the total focal length f is 14.5mm, Fno is 2.87, IMG HT is 3.137mm, FOV is 22.9°, α is 89.204°, and AL1 is 19.122mm. 2 The BFL is 8.539mm, the TTL is 16.336mm, and the PTTL is 19.906mm. The edge thickness of the fifth lens 750 is 0.57mm, the SAG value SAG51 of the object side of the fifth lens 750 is 0.07mm, and the SAG value SAG52 of the image side of the fifth lens 750 is 0.11mm.

[0299] The focal length of the first lens 710 is 6.95076mm, the focal length of the second lens 720 is -7.57602mm, the focal length of the third lens 730 is -75.2843mm, the focal length of the fourth lens 740 is 27.0706mm, and the focal length of the fifth lens 750 is 96.9979mm.

[0300] The first lens 710 has positive refractive power, and the first and second surfaces of the first lens 710 are convex.

[0301] The second lens 720 has negative refractive power, with its first surface being convex and its second surface being concave.

[0302] The third lens 730 has negative refractive power, with its first surface being convex and its second surface being concave.

[0303] The fourth lens 740 has positive refractive power, with a first surface that is convex and a second surface that is concave.

[0304] The fifth lens 750 has positive refractive power, the first surface of the fifth lens 750 is convex, and the second surface of the fifth lens 750 is concave.

[0305] As shown in Table 14, each surface of the first lens 710 to the fifth lens 750 has an aspherical surface coefficient. For example, both the object-side surface and the image-side surface of the first lens 710 to the fifth lens 750 are aspherical surfaces.

[0306] Table 14

[0307] K A B C D E S4 -6.50E-01 9.79E-04 1.01E-04 -3.00E-06 1.00E-06 -6.65E-08 S5 0 2.27E-03 4.00E-06 6.00E-06 -2.00E-06 9.49E-08 S6 0 -5.83E-03 7.55E-04 -6.30E-05 4.00E-06 -2.49E-08 S7 0 -1.07E-02 7.91E-04 -2.01E-04 3.40E-05 -3.00E-06 S8 0 -7.12E-03 1.38E-03 -1.99E-04 2.40E-05 -3.00E-06 S9 0 -1.54E-02 2.85E-03 -9.30E-05 -7.50E-05 1.20E-05 S10 0 -1.25E-02 6.49E-04 4.51E-04 -1.28E-04 1.60E-05 S11 0 -1.25E-02 1.09E-03 7.66E-04 -2.89E-04 2.60E-05 S12 0 -1.50E-02 -7.00E-05 2.12E-04 -1.20E-04 -2.00E-06 S13 0 -1.20E-02 -9.85E-04 1.96E-04 -7.00E-05 7.00E-06

[0308] Furthermore, the optical system configured as described above can have, for example... Figure 14 The aberration characteristics shown are illustrated.

[0309] Figure 15 This is a schematic three-dimensional diagram of an optical imaging system based on an example.

[0310] refer to Figure 15 The optical imaging system may include multiple lenses L1, L2, L3, L4 and L5, as well as spacer S1.

[0311] Although not shown in the accompanying drawings, the optical imaging system may also include a reflective element positioned closer to the object side than the plurality of lenses. Additionally, it may include a filter and an image sensor.

[0312] For example, the optical imaging system can be any of the optical imaging systems according to the first to seventh examples described above.

[0313] Multiple lenses L1, L2, L3, L4 and L5 can be arranged to be spaced apart from adjacent lenses.

[0314] At least some of lenses L1, L2, L3, L4, and L5 may have a non-circular planar shape. For example, the first lens L1 and the second lens L2 may be formed to have a non-circular shape, while the third lens L3 through the fifth lens L5 may be formed to have a circular shape. Alternatively, all of the lenses may be formed to have a non-circular shape.

[0315] Figure 18 It is a plan view of the first spacer ring of the example optical imaging system.

[0316] refer to Figure 18 Spacers can be placed between adjacent lenses.

[0317] Spacers maintain the distance between lenses and block unwanted light. For example, spacers can have a light-absorbing layer to block unwanted light. The light-absorbing layer can be a black film or black iron oxide.

[0318] The spacers may include a first spacer S1, a second spacer, a third spacer, and a fourth spacer arranged from the object side toward the image side.

[0319] The first spacer S1 can be disposed between lenses with non-circular shapes. For example, the first spacer S1 can be disposed between the first lens L1 and the second lens L2.

[0320] The second spacer can be positioned between the second lens L2 and the third lens L3, the third spacer can be positioned between the third lens L3 and the fourth lens L4, and the fourth spacer can be positioned between the fourth lens L4 and the fifth lens L5. For reference, in Figure 15 and Figure 18Only the first spacer S1 is shown in the diagram.

[0321] The first spacer S1 may have an opening 60 through which light passes. The opening 60 may be formed by the inner peripheral surface 40 of the first spacer S1. For example, the space surrounded by the inner peripheral surface 40 of the first spacer S1 may be used as the opening 60.

[0322] When viewed along the optical axis, the outer peripheral surface 50 of the first spacer S1 can be non-circular, and the inner peripheral surface 40 of the first spacer S1 can also be non-circular when viewed along the optical axis.

[0323] The outer peripheral surface 50 of the first spacer S1 can correspond to the shape of the first lens L1 and the second lens L2. For example, the outer peripheral surface 50 of the first spacer S1 may include a first outer surface 51, a second outer surface 52, a third outer surface 53 and a fourth outer surface 54.

[0324] The first outer surface 51 and the second outer surface 52 may have relative shapes facing each other, and the third outer surface 53 and the fourth outer surface 54 may have relative shapes facing each other.

[0325] When viewed along the optical axis, the first outer surface 51 and the second outer surface 52 may have an arcuate shape, while the third outer surface 53 and the fourth outer surface 54 may have a substantially linear shape.

[0326] The third outer surface 53 and the fourth outer surface 54 can be connected to the first outer surface 51 and the second outer surface 52, respectively.

[0327] In addition, the third outer surface 53 and the fourth outer surface 54 can be symmetrical about the optical axis and can be formed parallel to each other.

[0328] The inner circumferential surface 40 of the first spacer S1 may include a first inner surface 41, a second inner surface 42, a third inner surface 43, and a fourth inner surface 44.

[0329] The first inner surface 41 and the second inner surface 42 can face each other and have corresponding shapes, and the third inner surface 43 and the fourth inner surface 44 can face each other and have corresponding shapes.

[0330] When viewed along the optical axis, the first inner surface 41 and the second inner surface 42 may have an arcuate shape, while the third inner surface 43 and the fourth inner surface 44 may have a substantially linear shape.

[0331] The third inner surface 43 and the fourth inner surface 44 can be connected to the first inner surface 41 and the second inner surface 42, respectively.

[0332] In addition, the third inner surface 43 and the fourth inner surface 44 can be symmetrical about the optical axis and can be formed parallel to each other.

[0333] The inner circumferential surface 50 of the first spacer S1 may have a major axis (c) and a minor axis (d). For example, when viewed in the direction of the optical axis, the line segment that connects the third inner surface 43 and the fourth inner surface 44 with the shortest distance while passing through the optical axis may be the minor axis (d), while the line segment that connects the first inner surface 41 and the second inner surface 42 while passing through the optical axis and perpendicular to the minor axis (d) may be the major axis (c).

[0334] In this case, half of the major axis (c) can be the maximum radius of the opening 60, while half of the minor axis (d) can be the minimum radius of the opening 60.

[0335] Figures 19 to 22 This is a rear view of a portable electronic device equipped with a camera module.

[0336] Figures 19 to 22 The portable electronic device 1 shown can be a portable electronic device, such as a mobile communication terminal equipped with multiple camera modules, a smartphone, or a tablet PC.

[0337] Each of the multiple camera modules may include an optical imaging system.

[0338] exist Figures 19 to 22 In this process, camera module 2 may include any one of the optical imaging systems according to the first to seventh examples described above.

[0339] Camera module 2 can bend the direction of light propagation through reflective components.

[0340] The optical axis of the camera module 2 can be oriented in a direction perpendicular to the thickness direction of the portable electronic device 1 (Z-axis direction, i.e., from the front surface of the portable electronic device toward the rear surface of the portable electronic device, and vice versa).

[0341] For example, the optical axis of the camera module 2 can be formed in the width direction (Y direction) or length direction (X direction) of the portable electronic device 1.

[0342] Therefore, even when the camera module 2 has the characteristics of a telephoto camera with a relatively long focal length, the thickness of the portable electronic device 1 can be prevented from increasing. Thus, the thickness of the portable electronic device 1 can be minimized.

[0343] refer to Figure 19 A first camera module 2 and a second camera module 3 can be provided in the portable electronic device 1. For example, the portable electronic device 1 may include a dual-camera module.

[0344] The optical axes of the first camera module 2 and the second camera module 3 can be formed in different directions. For example, the optical axis of the first camera module 2 can be formed in the X direction, and the optical axis of the second camera module 3 can be formed in the Z direction.

[0345] In addition, the first camera module 2 and the second camera module 3 can be configured to have different fields of view and focal lengths.

[0346] The first camera module 2 can be configured to have a relatively narrow field of view and a relatively long focal length (e.g., telephoto), and the second camera module 3 can be configured to have a relatively wide field of view and a relatively short focal length (e.g., wide-angle).

[0347] As an example, the field of view of the first camera module 2 can be less than 30°. For instance, the field of view of the first camera module 2 can be in the range of 10° to 30°. The field of view of the second camera module 3 can be in the range of 75° to 85°.

[0348] The first camera module 2 can be configured such that Fno satisfies 2.8 ≤ Fno < 5. The second camera module 3 can be configured such that Fno satisfies 1.4 ≤ Fno ≤ 2.4.

[0349] The field of view and focal length of the two camera modules can be designed differently to capture images of objects at different depths.

[0350] refer to Figure 20 A first camera module 2, a second camera module 3, and a third camera module 4 can be provided in the portable electronic device 1. For example, the portable electronic device 1 may include a three-camera module. The first camera module 2 to the third camera module 4 can be arranged in the width direction (Y direction) or the length direction (X direction) of the portable electronic device 1.

[0351] The optical axis of the first camera module 2 can be formed in a direction different from the optical axis of the second camera module 3 and the third camera module 4. For example, the optical axis of the first camera module 2 can be formed in the X direction, and the optical axes of the second camera module 3 and the third camera module 4 can be formed in the Z direction.

[0352] In addition, the first camera module 2 to the third camera module 4 can be configured to have different field of view and focal length.

[0353] The first camera module 2 can be configured to have the narrowest field of view and the longest focal length (e.g., telephoto), and the third camera module 4 can be configured to have the widest field of view and the shortest focal length (e.g., ultra-wide-angle). The second camera module 3 can have a wider field of view than the first camera module 2 and a narrower field of view than the third camera module 4 (e.g., wide-angle).

[0354] As an example, the field of view of the first camera module 2 can be less than 30°. For example, the field of view of the first camera module 2 can be in the range of 10° to 30°. The field of view of the second camera module 3 can be in the range of 75° to 85°. The field of view of the third camera module 4 can be in the range of 110° to 150°.

[0355] The first camera module 2 can be configured such that Fno satisfies 2.8 ≤ Fno < 5. The second camera module 3 can be configured such that Fno satisfies 1.4 ≤ Fno ≤ 2.4. The third camera module 4 can be configured such that Fno satisfies 2.0 ≤ Fno ≤ 2.4.

[0356] The field of view and focal length of the three camera modules can be designed differently to capture images of objects at different depths.

[0357] refer to Figure 21 A first camera module 2, a second camera module 3, a third camera module 4, and a fourth camera module 5 can be disposed in a portable electronic device 1. For example, the portable electronic device 1 may include a four-camera module. The second camera module 3 to the fourth camera module 5 can be arranged in the width direction (Y direction) or the length direction (X direction) of the portable electronic device 1, and the first camera module 2 can be arranged adjacent to the second camera module 3 to the fourth camera module 5. Therefore, the first camera module 2, the second camera module 3, the third camera module 4, and the fourth camera module 5 can be arranged as a whole in a quadrilateral shape.

[0358] The optical axis of the first camera module 2 can be formed in a direction different from the optical axis of the second camera module 3 to the fourth camera module 5. For example, the optical axis of the first camera module 2 can be formed in the X direction, and the optical axes of the second camera module 3 to the fourth camera module 5 can be formed in the Z direction.

[0359] In addition, the first camera module 2 to the fourth camera module 5 can be configured to have different field of view and focal length.

[0360] The first camera module 2 can be configured to have the narrowest field of view and the longest focal length (e.g., super telephoto), and the fourth camera module 5 can be configured to have the widest field of view and the shortest focal length (e.g., ultra-wide-angle). The second camera module 3 can have a wider field of view than the first camera module 2 and a narrower field of view than the third camera module 4 (e.g., telephoto). The third camera module 4 can have a wider field of view than the second camera module 3 and a narrower field of view than the fourth camera module 5 (e.g., wide-angle).

[0361] As an example, the field of view of the first camera module 2 can be less than 30°. For instance, the field of view of the first camera module 2 can be in the range of 10° to 30°. The field of view of the second camera module 3 can be in the range of 40° to 45°. The field of view of the third camera module 4 can be in the range of 75° to 85°. The field of view of the fourth camera module 5 can be in the range of 110° to 150°.

[0362] The first camera module 2 can be configured such that Fno satisfies 2.8 ≤ Fno < 5. The second camera module 3 can be configured such that Fno satisfies 1.8 ≤ Fno ≤ 2.4. The third camera module 4 can be configured such that Fno satisfies 1.4 ≤ Fno ≤ 2.4. The fourth camera module 5 can be configured such that Fno satisfies 2.0 ≤ Fno ≤ 2.4.

[0363] The field of view and focal length of the four camera modules can be designed differently to capture images of objects at different depths.

[0364] Figure 22 The example shown can be compared with Figure 20 The example shown is the same, but it may differ in the arrangement of the first camera module 2, the second camera module 3, and the third camera module 4.

[0365] refer to Figure 22 The second camera module 3 and the third camera module 4 can be arranged on both sides of the first camera module 2. The second camera module 3 and the third camera module 4 can be arranged in the width direction (Y direction) or length direction (X direction) of the portable electronic device 1.

[0366] The first camera module 2, the second camera module 3, and the third camera module 4 can be arranged as a whole in a triangle.

[0367] The optical imaging system according to embodiments of the present disclosure can be mounted on a portable electronic device with a relatively small thickness and can have a relatively long focal length.

[0368] While this disclosure includes specific examples, it will be apparent upon understanding the disclosure of this application that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be understood in a descriptive sense only and not for limiting purposes. The description of features or aspects in each example should be considered applicable to similar features or aspects in other examples. Appropriate results may still be achieved if the described techniques are performed in a different order, and / or if components in the described system, architecture, device, or circuit are combined in different ways and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of this disclosure is not limited by the specific embodiments but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in this disclosure.

Claims

1. An optical imaging system, including: The first lens has positive refractive power, a convex object-side surface, and a convex image-side surface; The second lens has negative refractive power and a concave image side surface; The third lens has positive refractive power and a convex object-side surface; The fourth lens has refractive power; as well as The fifth lens has refractive power, a convex object-side surface, and a concave image-side surface. At least one of the fourth lens and the fifth lens has negative refractive power. The first lens to the fifth lens are arranged sequentially from the object side toward the image side. The optical imaging system has a total of five lenses. Wherein, in the two axes of the first lens that intersect the optical axis and are perpendicular to each other, the length of one axis is greater than the length of the other axis, and The following conditional expression is satisfied: 0.87 < TTL / f < 1.31; -0.7 mm < f1 + f2 < 1.3 mm; 4.5 < TTL / IMG HT < 6.5; and 0.65 < L1S1es / L1S1el < 0.9 Wherein, TTL is the distance from the object-side surface of the first lens to the imaging surface on the optical axis, f is the total focal length of the optical imaging system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, IMG HT is half the diagonal length of the imaging surface, L1S1el is the maximum effective radius of the object-side surface of the first lens, and L1S1es is the minimum effective radius of the object-side surface of the first lens.

2. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: FOV < 25° FOV is the field of view of the optical imaging system.

3. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: 0.9 < BFL / (2×IMG HT) < 3.0 Wherein, BFL is the distance along the optical axis from the image-side surface of the fifth lens to the imaging surface.

4. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: 1.1 < sumCT / sumET < 1.4 Wherein, sumCT is the sum of the thicknesses of the first lens to the fifth lens along the optical axis, and SumET is the sum of the edge thicknesses of the first lens to the fifth lens.

5. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: 1.3 < (CT5 / ET5)×L5S1el < 2.5 Wherein, CT5 is the thickness of the fifth lens on the optical axis, ET5 is the thickness of the edge of the fifth lens, and L5S1el is the maximum effective radius of the object side surface of the fifth lens.

6. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: -0.2 < SAG51 / IMG HT < 0.2 SAG51 is the SAG value at the edge of the object side of the fifth lens.

7. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: -0.1 < SAG52 / IMG HT < 0.1 SAG52 is the SAG value at the edge of the image-side surface of the fifth lens.

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

9. The optical imaging system according to claim 1, wherein, The second lens has a concave object-side surface.

10. The optical imaging system according to claim 1, wherein, The third lens has a convex image-side surface.

11. The optical imaging system according to claim 1, wherein, The third lens has a concave image-side surface.

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

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

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

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

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