Optical image capturing system

Abstract

The optical image capturing system includes: a first lens having a positive refractive power and a convex object-side surface; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having refractive power; and a fifth lens having refractive power, in which the first to fifth lenses are disposed in order from the object side toward the image plane, in which the optical image capturing system has a total of five lenses having refractive power, in which the sign of the refractive power of the fourth lens is different from the sign of the refractive power of the fifth lens, where 0.2 lt; (D23 + D34 + D45) / BFLlt; 0, 0.5, 0.8 lt; tTL / flt; 0.95, and 2.4 lt; (V2 + V4) / V3 is less than or equal to 2.6988.

Description

[0001] Cross - reference to related applications

[0002] This application claims the priority benefit of Korean Patent Application No. 10 - 2020 - 0053742, filed with the Korean Intellectual Property Office on May 6, 2020. The entire disclosure of the above - mentioned Korean patent application is incorporated herein by reference for all purposes. Technical field

[0003] This application relates to an optical imaging system configured to fold an optical path. Background art

[0004] A small camera can be installed in a wireless terminal device. For example, small cameras can be installed on the front and rear surfaces of the wireless terminal device, respectively. Since small cameras are used for various purposes, such as outdoor landscape pictures, indoor portrait pictures, etc., small cameras need to have performance comparable to that of ordinary cameras. However, since the installation space of the small camera is limited by the size of the wireless terminal device, it may be difficult to implement a high - performance small camera. Therefore, it is necessary to develop an optical imaging system that can improve the performance of a small camera without increasing the size of the small camera. Summary of the invention

[0005] The Summary of the Invention section is provided to introduce, in a brief form, selections of inventive concepts that will be further described in the Detailed Description section below. The Summary of the Invention section is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

[0006] An optical imaging system that can be installed in a thin and small - sized terminal device and has a long focal length.

[0007] In a general aspect, the optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially arranged from the object side, wherein the third lens has a positive refractive power. In the optical imaging system, 0.2 < (D23 + D34 + D45) / BFL < 0.95 and 0.8 < TTL / f < 0.95, where D23 is the distance from the image side surface of the second lens to the object side surface of the third lens, D34 is the distance from the image side surface of the third lens to the object side surface of the fourth lens, D45 is the distance from the image side surface of the fourth lens to the object side surface of the fifth lens, BFL is the distance from the image side surface of the fifth lens to the imaging surface, TTL is the distance from the object side surface of the first lens to the imaging surface, and f is the focal length of the optical imaging system.

[0008] The second lens may have a negative refractive power.

[0009] The sum of the refractive index of the second lens and the refractive index of the third lens can be greater than 3.20.

[0010] The absolute value of the sum of the focal length of the first lens and the focal length of the second lens can be less than 2.0.

[0011] The optical imaging system can satisfy |f / f1 + f / f2| < 1.2, where f1 is the focal length of the first lens and f2 is the focal length of the second lens.

[0012] The optical imaging system can satisfy 0 ≤ D12 / f ≤ 0.07, where D12 is the distance from the image side of the first lens to the object side of the second lens.

[0013] The optical imaging system can satisfy 0.62 ≤ EL1S1 / ImgHT ≤ 0.94, where EL1S1 is the effective radius of the object side of the first lens and ImgHT is the height of the imaging surface.

[0014] The optical imaging system can satisfy 0.8 ≤ EL1S2 / EL1S1 ≤ 1.01, where EL1S1 is the effective radius of the object side of the first lens and EL1S2 is the effective radius of the image side of the first lens.

[0015] The optical imaging system can satisfy 3.5 ≤ TTL / ImgHT, where ImgHT is the height of the imaging surface.

[0016] The optical imaging system can satisfy R1 / f ≤ 0.265, where R1 is the radius of curvature of the object side of the first lens.

[0017] In another general aspect, the optical imaging system includes: a first lens having a refractive power, a second lens having a refractive power, a third lens having a refractive power, a fourth lens having a refractive power, and a fifth lens having a positive refractive power. In the optical imaging system, the thickness T1 at the optical axis center of the first lens and the distance TTL from the object side of the first lens to the imaging surface satisfy 0.08 < T1 / TTL < 0.18.

[0018] The image side of the third lens can be concave.

[0019] The object side of the fourth lens can be convex.

[0020] The image side of the fourth lens can be concave.

[0021] The object side of the fifth lens can be convex.

[0022] The optical imaging system can satisfy 2.4 < (V2 + V4) / V3, where V2 is the Abbe number of the second lens, V3 is the Abbe number of the third lens, and V4 is the Abbe number of the fourth lens.

[0023] Other features and aspects will become apparent from the following detailed description, the drawings, and the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Shows the configuration of an optical imaging system according to a first example.

[0025] Figure 2 is Figure 1 The aberration curve of the optical imaging system shown.

[0026] Figure 3 Shows the configuration of an optical imaging system according to a second example.

[0027] Figure 4 is Figure 3 The aberration curve of the optical imaging system shown.

[0028] Figure 5 Shows the configuration of an optical imaging system according to a third example.

[0029] Figure 6 is Figure 5 The aberration curve of the optical imaging system shown.

[0030] Figure 7 Shows the configuration of an optical imaging system according to a fourth example.

[0031] Figure 8 is Figure 7 The aberration curve of the optical imaging system shown.

[0032] Figure 9 Shows the configuration of an optical imaging system according to a fifth example.

[0033] Figure 10 is Figure 9 The aberration curve of the optical imaging system shown.

[0034] Figure 11 Shows the configuration of an optical imaging system according to a sixth example.

[0035] Figure 12 is Figure 11 The aberration curve of the optical imaging system shown.

[0036] Figure 13 Shows the configuration of an optical imaging system according to a seventh example.

[0037] Figure 14 is Figure 13 The aberration curve of the optical imaging system shown.

[0038] Figure 15It is a configuration diagram of an optical imaging system according to the eighth example.

[0039] Figure 16 is Figure 15 the aberration curve of the optical imaging system shown.

[0040] Figure 17 Shows the configuration of an optical imaging system according to the ninth example.

[0041] Figure 18 is Figure 17 the aberration curve of the optical imaging system shown.

[0042] Figure 19 and Figure 20 are modified examples of the optical imaging system.

[0043] Figure 21 and Figure 22 are rear views of portable terminal devices, each portable terminal device having an optical imaging system according to the example.

[0044] In all the drawings and the detailed description, the same reference numerals refer to the same elements. For clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative dimensions, proportions, and depictions of elements in the drawings may be exaggerated. Detailed Description

[0045] The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, apparatuses, and / or systems described in this application. However, various changes, modifications, and equivalents of the methods, apparatuses, and / or systems described in this application will be apparent to those of ordinary skill in the art. The order of operations described in this application is merely an example and, except for operations that must occur in a specific order, is not limited to the order set forth in this application and may be changed, which will be apparent to those of ordinary skill in the art. Additionally, descriptions of functions and constructions that will be known to those of ordinary skill in the art may be omitted for greater clarity and conciseness.

[0046] The features described in this application may be implemented in different forms and should not be construed as limited to the examples described in this application. Rather, the examples described in this application are provided so that this disclosure will be thorough and complete and will fully convey the scope of this disclosure to those of ordinary skill in the art.

[0047] It should be noted that in this application, the phrase "may" is used with respect to an example or embodiment, such as with respect to what an example or embodiment may include or achieve, meaning that there is at least one example or embodiment in which such a feature is included or achieved, and all examples and embodiments are not limited thereto.

[0048] 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 can be directly "on," directly "connected to," or directly "coupled to" the other element, or one or more other elements can be present between the element and the other element. Conversely, when an element is described as being "directly on," "directly connected to," or "directly coupled to" another element, there can be no other elements between the element and the other element.

[0049] As used in this application, the phrase "and / or" includes any one of the associated listed items and any combination of any two or more of them.

[0050] Although terms such as "first," "second," and "third" may be used in this application to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited by these terms. Rather, these terms are only used to distinguish one component, part, region, layer, or section from another. Thus, without departing from the teachings of the examples described in this application, the first component, first part, first region, first layer, or first section mentioned in these examples can also be referred to as the second component, second part, second region, second layer, or second section.

[0051] Spatial relative terms such as "above," "upper," "below," and "lower" may be used in this application for convenience in description to describe the relationship of one element to another as shown in the figures. In addition to covering the orientations depicted in the figures, these spatial relative terms are intended to also cover different orientations of the device during use or operation. For example, if the device in the figures is flipped, an element described as being "above" or "upper" relative to another element will be "below" or "lower" relative to the other element. Thus, depending on the spatial orientation of the device, the term "above" covers both the "above" and "below" orientations. The device can 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.

[0052] The terms used in this application are only for describing various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the articles "a", "an", and "the" are intended to include the plural forms as well. The phrases "comprising", "including", and "having" indicate the presence of the described 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.

[0053] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Accordingly, the examples described in this application are not limited to the specific shapes shown in the drawings, but include shape variations that occur during manufacturing.

[0054] The features of the examples described in this application can be combined in various ways that will be apparent after understanding the disclosure of this application. Additionally, although the examples described in this application have various configurations, other configurations that will be apparent after understanding the disclosure of this application are also feasible.

[0055] For clarity, illustration, and convenience purposes, the drawings may not be drawn to scale, and the relative dimensions, proportions, and depictions of elements in the drawings may be exaggerated.

[0056] In an example, the first lens refers to the lens closest to the object (or subject), and the fifth lens refers to the lens closest to the imaging surface (or image sensor). In an exemplary embodiment, the units of the radius of curvature, thickness, TTL, ImgHT (height of the imaging surface: half of the diagonal length of the imaging surface), and focal length are all expressed in millimeters (mm). The thickness of the lens, the distance between lenses, and the TTL refer to the distances on the optical axis. Additionally, in the description of the shape of a lens, a configuration in which one surface is convex means that the optical axis region of that surface is convex, and a configuration in which one surface is concave means that the optical axis region of that surface is concave. Thus, even when one surface of a lens is described as convex, the edge of the lens can be concave. Similarly, even when one surface of a lens is described as concave, the edge of the lens can be convex.

[0057] An optical imaging system includes an optical system having a plurality of lenses. For example, the optical system of an optical imaging system can include a plurality of lenses having refractive power. However, an optical imaging system includes not only lenses having refractive power. For example, an optical imaging system can include a prism for refracting incident light and a diaphragm for adjusting the amount of light. An optical imaging system can also include an infrared cut-off filter for blocking infrared light rays. An optical imaging system can also include an image sensor (e.g., an imaging device) configured to convert an image of an object incident through the optical system into an electrical signal. An optical imaging system can also include a spacer member for adjusting the distance between lenses.

[0058] Multiple lenses can be formed of a material having a refractive index different from that of air. For example, the multiple lenses can be formed of a plastic or glass material. At least one of the multiple lenses can have an aspherical shape. The aspherical surface of the lens can be represented by Equation 1 as follows.

[0059] Equation 1:

[0060]

[0061] In Equation 1, "c" is the reciprocal of the radius of curvature of the corresponding lens, "k" is the conic constant, "r" is the distance from a certain point on the aspherical surface of the lens to the optical axis, "A to J" are aspherical constants, and "Z" (or SAG) is the distance in the optical axis direction from a certain point on the aspherical surface of the lens to the vertex of the aspherical surface.

[0062] The optical imaging system can include five or more lenses. For example, the optical imaging system can include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially arranged from the object side.

[0063] The first lens to the fifth lens can be arranged with an interval relative to the adjacent lens. For example, a certain interval can be formed between the image side surface of the lens and the object side surface of the adjacent lens.

[0064] The first lens has a certain refractive power. For example, the first lens can have a positive refractive power. One surface of the first lens is convex. For example, the object side surface of the first lens can be convex. The first lens has a certain refractive index. For example, the first lens can have a refractive index less than 1.56. The first lens has a certain focal length. For example, the focal length of the first lens can be determined within the range of 4.0 mm to 8.0 mm.

[0065] The second lens has a certain refractive power. For example, the second lens can have a negative refractive power. One surface of the second lens is concave. For example, the object side surface or the image side surface of the second lens can be concave. The second lens has a certain refractive index. For example, the refractive index of the second lens can be 1.6 or more and less than 1.8. The second lens has a certain focal length. For example, the focal length of the second lens can be determined within the range of -7.0 mm to -3.0 mm.

[0066] The third lens has a certain refractive power. For example, the third lens may have a positive refractive power. One surface of the third lens is convex. For example, the object side or the image side of the third lens may be convex. The third lens has a certain refractive index. For example, the third lens may have a refractive index of 1.65 or more and less than 2.0. Additionally, the refractive index of the third lens may be greater than the refractive index of the second lens. The third lens has a certain focal length. For example, the focal length of the third lens may be determined within the range of 4.6 mm to 20 mm.

[0067] The fourth lens has a certain refractive power. For example, the fourth lens may have a positive refractive power or a negative refractive power. One surface of the fourth lens has a concave shape. For example, the object side or the image side of the fourth lens may be concave. The fourth lens has a certain refractive index. For example, the fourth lens may have a refractive index of 1.6 or more and less than 1.8.

[0068] The fifth lens has a certain refractive power. For example, the fifth lens may have a positive refractive power or a negative refractive power. One surface of the fifth lens is concave. For example, the object side or the image side of the fifth lens may be concave. The fifth lens has a certain refractive index. For example, the fifth lens may have a refractive index of 1.5 or more and less than 1.6.

[0069] The optical imaging system includes lenses formed of plastic. For example, in the optical imaging system, at least one of the five or more lenses constituting the lens group may be formed of a plastic material. The optical imaging system includes aspherical lenses. For example, in the optical imaging system, at least one of the five or more lenses constituting the lens group may include aspherical lenses.

[0070] The optical imaging system may include members configured to fold or refract the optical path. For example, the optical imaging system may include one or more prisms. One or more prisms may be disposed on the object side of the first lens or on the object side of the first lens and the image side of the fifth lens. One or more prisms may have a refractive index higher than that of the third lens. For example, the refractive index of the prism may be 1.7 or more.

[0071] The optical imaging system includes a filter, a diaphragm, and an image sensor. The filter is disposed between the lens closest to the imaging surface and the image sensor. The filter may block a portion of the wavelengths from the incident light to improve the resolution of the optical imaging system. For example, the filter may block the infrared wavelengths of the incident light. The f-number of the optical imaging system may be 2.6 or more.

[0072] The optical imaging system may satisfy one or more of the following conditional expressions.

[0073] 3.2 < n2 + n3

[0074] |f1 + f2| < 2.0

[0075] |f1 / (f1 + f / f2)| < 1.2

[0076] 0 ≤ D12 / f ≤ 0.07

[0077] 0.62 ≤ EL1S1 / ImgHT ≤ 0.94

[0078] 0.8 ≤ EL1S2 / EL1S1 ≤ 1.01

[0079] 0.8 ≤ TTL / f ≤ 0.95

[0080] 3.5 ≤ TTL / ImgHT

[0081] R1 / f ≤ 0.265

[0082] 0.08 < T1 / TTL < 0.18

[0083] In the above conditional expressions, "n2" is the refractive index of the second lens, "n3" is the refractive index of the third lens, "f" is the 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, "D12" is the distance from the image side surface of the first lens to the object side surface of the second lens, "EL1S1" is the effective radius of the object side surface of the first lens, "EL1S2" is the effective radius of the image side surface of the first lens, "TTL" is the distance from the object side surface of the first lens to the imaging surface, "ImgHT" is the height of the imaging surface (half of the diagonal length of the imaging surface), "R1" is the curvature radius of the object side surface of the first lens, and "T1" is the thickness at the optical axis center of the first lens.

[0084] The optical imaging system may also satisfy at least one of the following conditional expressions.

[0085] 0.4 < BFL / f

[0086] 0.4 < BFL / TTL

[0087] 2.05 < BFL / ImgHT

[0088] 2.1 < f / ImgHT

[0089] 0.06 < (D23 + D45) / BFL

[0090] 0.15 < D23 / BFL

[0091] 0.15 < D45 / BFL

[0092] 0.2 < (D23 + D34 + D45) / BFL < 0.5

[0093] 0.8 < (L1S1:L5S2) / BFL < 1.2

[0094] (n2 + n4) / n3 < 2.0

[0095] 2.4 < (V2 + V4) / V3

[0096] In the above conditional expressions, "BFL" is the distance from the image side of the fifth lens to the imaging surface, "D23" is the distance from the image side of the second lens to the object side of the third lens, "D34" is the distance from the image side of the third lens to the object side of the fourth lens, "D45" is the distance from the image side of the fourth lens to the object side of the fifth lens, "L1S1:L5S2" is the distance from the object side of the first lens to the image side of the fifth lens, "n4" is the refractive index of the fourth lens, "V2" is the Abbe number of the second lens, "V3" is the Abbe number of the third lens, and "V4" is the Abbe number of the fourth lens.

[0097] Hereinafter, an optical imaging system according to various examples will be described.

[0098] Reference will be made to Figure 1 describe an optical imaging system according to the first example.

[0099] The optical imaging system 100 may include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, and a fifth lens 150.

[0100] The first lens 110 has a positive refractive power. In the first lens 110, the object side is convex and the image side is convex. The second lens 120 has a negative refractive power. In the second lens 120, the object side is concave and the image side is concave. The third lens 130 has a positive refractive power. In the third lens 130, the object side is convex and the image side is concave. The fourth lens 140 has a negative refractive power. In the fourth lens 140, the object side is convex and the image side is concave. The fifth lens 150 has a positive refractive power. In the fifth lens 150, the object side is convex and the image side is concave.

[0101] The optical imaging system 100 may include a filter IF and an image sensor IP. The filter IF may be disposed in front of the image sensor IP to block infrared light and the like included in the incident light. The image sensor IP may include a plurality of optical sensors. The image sensor IP configured as described above may be configured to convert an optical signal into an electrical signal. The image sensor IP may form an imaging surface for imaging light incident through the first lens 110 to the fifth lens 150.

[0102] The optical imaging system 100 may include an optical path changing mechanism. For example, the optical imaging system 100 may include a prism that reflects or refracts incident light in a direction intersecting the optical path of the incident light.

[0103] Table 1 shows the lens characteristics of the optical imaging system 100, and Table 2 shows the aspherical values of the optical imaging system 100. Figure 2 is the aberration curve of the optical imaging system 100 configured as described above.

[0104] Table 1

[0105]

[0106] Table 2

[0107]

[0108]

[0109] Hereinafter, reference will be made to Figure 3 describe the optical imaging system according to the second example.

[0110] The optical imaging system 200 may include a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, and a fifth lens 250.

[0111] The first lens 210 has a positive refractive power. In the first lens 210, the object side is convex and the image side is convex. The second lens 220 has a negative refractive power. In the second lens 220, the object side is concave and the image side is concave. The third lens 230 has a positive refractive power. In the third lens 230, the object side is convex and the image side is concave. The fourth lens 240 has a negative refractive power. In the fourth lens 240, the object side is convex and the image side is concave. The fifth lens 250 has a positive refractive power. In the fifth lens 250, the object side is convex and the image side is concave.

[0112] The optical imaging system 200 may include a filter IF and an image sensor IP. The filter IF may be disposed in front of the image sensor IP to block infrared light and the like included in the incident light. The image sensor IP may include a plurality of optical sensors. The image sensor IP configured as described above may be configured to convert an optical signal into an electrical signal. The image sensor IP may form an imaging surface for imaging the light incident through the first lens 210 to the fifth lens 250.

[0113] The optical imaging system 200 may include an optical path changing mechanism. For example, the optical imaging system 200 may include a prism that reflects or refracts incident light in a direction intersecting the optical path of the incident light.

[0114] Table 3 shows the lens characteristics of the optical imaging system 200, and Table 4 shows the aspherical values of the optical imaging system 200. Figure 4 is the aberration curve of the optical imaging system 200 of the above configuration.

[0115] Table 3

[0116]

[0117] Table 4

[0118]

[0119]

[0120] Hereinafter, reference will be made to Figure 5 describe the optical imaging system according to the third example.

[0121] The optical imaging system 300 may include a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, and a fifth lens 350.

[0122] The first lens 310 has a positive refractive power. In the first lens 310, the object side is convex and the image side is convex. The second lens 320 has a negative refractive power. In the second lens 320, the object side is concave and the image side is concave. The third lens 330 has a positive refractive power. In the third lens 330, the object side is convex and the image side is concave. The fourth lens 340 has a negative refractive power. In the fourth lens 340, the object side is convex and the image side is concave. The fifth lens 350 has a positive refractive power. In the fifth lens 350, the object side is convex and the image side is concave.

[0123] The optical imaging system 300 may include a filter IF and an image sensor IP. The filter IF may be disposed in front of the image sensor IP to block infrared light included in the incident light. The image sensor IP may include a plurality of optical sensors. The image sensor IP of the above configuration may be configured to convert an optical signal into an electrical signal. The image sensor IP may form an imaging surface for imaging light incident through the first lens 310 to the fifth lens 350.

[0124] The optical imaging system 300 may include an optical path changing mechanism. For example, the optical imaging system 300 may include a prism that reflects or refracts incident light in a direction intersecting the optical path of the incident light.

[0125] Table 5 shows the lens characteristics of the optical imaging system 300, and Table 6 shows the aspherical values of the optical imaging system 300. Figure 6It is the aberration curve of the optical imaging system 300 configured as above.

[0126] Table 5

[0127]

[0128] Table 6

[0129]

[0130]

[0131] In the following, reference will be made to Figure 7 Describe the optical imaging system according to the fourth example.

[0132] The optical imaging system 400 may include a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, and a fifth lens 450.

[0133] The first lens 410 has a positive refractive power. In the first lens 410, the object side is convex and the image side is convex. The second lens 420 has a negative refractive power. In the second lens 420, the object side is concave and the image side is concave. The third lens 430 has a positive refractive power. In the third lens 430, the object side is convex and the image side is concave. The fourth lens 440 has a negative refractive power. In the fourth lens 440, the object side is convex and the image side is concave. The fifth lens 450 has a negative refractive power. In the fifth lens 450, the object side is convex and the image side is concave.

[0134] The optical imaging system 400 includes a filter IF and an image sensor IP. The filter IF may be disposed in front of the image sensor IP to block infrared light included in the incident light. The image sensor IP may include a plurality of optical sensors. The image sensor IP configured as above is configured to convert an optical signal into an electrical signal. The image sensor IP may form an imaging surface for imaging light incident through the first lens 410 to the fifth lens 450.

[0135] The optical imaging system 400 may include an optical path changing mechanism. For example, the optical imaging system 400 may include a prism that reflects or refracts incident light in a direction intersecting the optical path of the incident light.

[0136] Table 7 shows the lens characteristics of the optical imaging system 400, and Table 8 shows the aspherical values of the optical imaging system 400. Figure 8 It is the aberration curve of the optical imaging system 400 configured as above.

[0137] Table 7

[0138]

[0139] Table 8

[0140]

[0141]

[0142] In the following, reference will be made to Figure 9 describe the optical imaging system according to the fifth example.

[0143] The optical imaging system 500 may include a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, and a fifth lens 550.

[0144] The first lens 510 has a positive refractive power. In the first lens 510, the object side is convex and the image side is convex. The second lens 520 has a negative refractive power. In the second lens 520, the object side is concave and the image side is concave. The third lens 530 has a positive refractive power. In the third lens 530, the object side is convex and the image side is convex. The fourth lens 540 has a positive refractive power. In the fourth lens 540, the object side is concave and the image side is convex. The fifth lens 550 has a negative refractive power. In the fifth lens 550, the object side is concave and the image side is convex.

[0145] The optical imaging system 500 may include a filter IF and an image sensor IP. The filter IF may be disposed in front of the image sensor IP to block infrared light included in the incident light. The image sensor IP may include a plurality of optical sensors. The image sensor IP configured as described above is configured to convert an optical signal into an electrical signal. The image sensor IP may form an imaging surface for imaging light incident through the first lens 510 to the fifth lens 550.

[0146] The optical imaging system 500 may include an optical path changing mechanism. For example, the optical imaging system 500 may include a prism that reflects or refracts incident light in a direction intersecting the optical path of the incident light.

[0147] Table 9 shows the lens characteristics of the optical imaging system 500, and Table 10 shows the aspherical values of the optical imaging system 500. Figure 10 is the aberration curve of the optical imaging system 500 configured as described above.

[0148] Table 9

[0149]

[0150] Table 10

[0151]

[0152]

[0153] In the following, reference will be made to Figure 11 describe the optical imaging system according to the sixth example.

[0154] The optical imaging system 600 may include a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, and a fifth lens 650.

[0155] The first lens 610 has a positive refractive power. In the first lens 610, the object side is convex and the image side is convex. The second lens 620 has a negative refractive power. In the second lens 620, the object side is concave and the image side is concave. The third lens 630 has a positive refractive power. In the third lens 630, the object side is convex and the image side is convex. The fourth lens 640 has a negative refractive power. In the fourth lens 640, the object side is concave and the image side is concave. The fifth lens 650 has a positive refractive power. In the fifth lens 650, the object side is convex and the image side is concave.

[0156] The optical imaging system 600 includes a filter IF and an image sensor IP. The filter IF may be disposed in front of the image sensor IP to block infrared light included in the incident light. The image sensor IP may include a plurality of optical sensors. The image sensor IP configured as described above is configured to convert an optical signal into an electrical signal. The image sensor IP may form an imaging surface for imaging light incident through the first lens 610 to the fifth lens 650.

[0157] The optical imaging system 600 may include an optical path changing mechanism. For example, the optical imaging system 600 may include a prism that reflects or refracts incident light in a direction intersecting the optical path of the incident light.

[0158] Table 11 shows the lens characteristics of the optical imaging system 600, and Table 12 shows the aspherical values of the optical imaging system 600. Figure 12 is the aberration curve of the optical imaging system 600 configured as described above.

[0159] Table 11

[0160]

[0161]

[0162] Table 12

[0163]

[0164]

[0165] In the following, reference will be made to Figure 13 describe the optical imaging system according to the seventh example.

[0166] The optical imaging system 700 may include a first lens 710, a second lens 720, a third lens 730, a fourth lens 740, and a fifth lens 750.

[0167] The first lens 710 has a positive refractive power. In the first lens 710, the object side is convex and the image side is convex. The second lens 720 has a negative refractive power. In the second lens 720, the object side is concave and the image side is concave. The third lens 730 has a positive refractive power. In the third lens 730, the object side is convex and the image side is concave. The fourth lens 740 has a negative refractive power. In the fourth lens 740, the object side is convex and the image side is concave. The fifth lens 750 has a positive refractive power. In the fifth lens 750, the object side is convex and the image side is concave.

[0168] The optical imaging system 700 includes a filter IF and an image sensor IP. The filter IF may be disposed in front of the image sensor IP to block infrared rays included in the incident light. The image sensor IP may include a plurality of optical sensors. The image sensor IP configured as described above is configured to convert an optical signal into an electrical signal. The image sensor IP may form an imaging surface for imaging light incident through the first lens 710 to the fifth lens 750.

[0169] The optical imaging system 700 may include an optical path changing mechanism. For example, the optical imaging system 700 may include a prism that reflects or refracts incident light in a direction intersecting the optical path of the incident light.

[0170] Table 13 shows the lens characteristics of the optical imaging system 700, and Table 14 shows the aspherical values of the optical imaging system 700. Figure 14 is the aberration curve of the optical imaging system 700 configured as described above.

[0171] Table 13

[0172]

[0173]

[0174] Table 14

[0175]

[0176]

[0177] In the following, reference will be made to Figure 15 describe the optical imaging system according to the eighth example.

[0178] The optical imaging system 800 may include a first lens 810, a second lens 820, a third lens 830, a fourth lens 840, and a fifth lens 850.

[0179] The first lens 810 has a positive refractive power. In the first lens 810, the object side is convex and the image side is convex. The second lens 820 has a negative refractive power. In the second lens 820, the object side is concave and the image side is concave. The third lens 830 has a positive refractive power. In the third lens 830, the object side is convex and the image side is concave. The fourth lens 840 has a negative refractive power. In the fourth lens 840, the object side is convex and the image side is concave. The fifth lens 850 has a positive refractive power. In the fifth lens 850, the object side is convex and the image side is concave.

[0180] The optical imaging system 800 includes a filter IF and an image sensor IP. The filter IF may be disposed in front of the image sensor IP to block infrared light included in the incident light. The image sensor IP may include a plurality of optical sensors. The image sensor IP configured as described above is configured to convert an optical signal into an electrical signal. The image sensor IP may form an imaging surface for imaging light incident through the first lens 810 to the fifth lens 850.

[0181] The optical imaging system 800 may include an optical path changing mechanism. For example, the optical imaging system 800 may include a prism that reflects or refracts incident light in a direction intersecting the optical path of the incident light.

[0182] Table 15 shows the lens characteristics of the optical imaging system 800, and Table 16 shows the aspherical values of the optical imaging system 800. Figure 16 is the aberration curve of the optical imaging system 800 configured as described above.

[0183] Table 15

[0184]

[0185]

[0186] Table 16

[0187] Aspherical Constant S5 S6 S7 S8 S9 K -0.61007 -1.44237 -99.00000 0.28690 0.46067 A 0.00082 0.00165 -0.00275 -0.00554 -0.00457 B 0.00005 -0.00001 0.00053 0.00038 0.00082 C 0.00000 0.00000 0.00000 -0.00002 -0.00003 D 0.00000 0.00000 0.00000 0.00002 0.00000 E 0.00000 0.00000 0.00000 0.00000 0.00000 F 0.00000 0.00000 0.00000 0.00000 0.00000 G 0.00000 0.00000 0.00000 0.00000 0.00000 H 0.00000 0.00000 0.00000 0.00000 0.00000 J 0.00000 0.00000 0.00000 0.00000 0.00000 Aspherical Constant S10 S11 S12 S13 S14 K -10.57142 96.19935 0.28336 -0.87741 -60.82116 A -0.00681 -0.00515 -0.00841 -0.01496 -0.00593 B 0.00136 0.00012 0.00270 0.00238 0.00055 C 0.00004 0.00036 0.00099 0.00154 -0.00035 D 0.00006 -0.00002 0.00014 0.00000 0.00048 E 0.00001 0.00001 -0.00014 0.00001 0.00002 F -0.00001 -0.00001 0.00000 0.00000 -0.00002 G 0.00000 0.00000 0.00000 0.00000 0.00000 H 0.00000 0.00000 0.00000 0.00000 0.00000 J 0.00000 0.00000 0.00000 0.00000 0.00000

[0188] In the following, reference will be made to Figure 17Describe the optical imaging system according to the ninth example.

[0189] The optical imaging system 900 may include a first lens 910, a second lens 920, a third lens 930, a fourth lens 940, and a fifth lens 950.

[0190] The first lens 910 has a positive refractive power. In the first lens 910, the object side is convex and the image side is convex. The second lens 920 has a negative refractive power. In the second lens 920, the object side is concave and the image side is concave. The third lens 930 has a positive refractive power. In the third lens 930, the object side is convex and the image side is concave. The fourth lens 940 has a negative refractive power. In the fourth lens 940, the object side is convex and the image side is concave. The fifth lens 950 has a positive refractive power. In the fifth lens 950, the object side is convex and the image side is concave.

[0191] The optical imaging system 900 includes a filter IF and an image sensor IP. The filter IF may be disposed in front of the image sensor IP to block infrared light included in the incident light. The image sensor IP may include a plurality of optical sensors. The image sensor IP configured as described above is configured to convert an optical signal into an electrical signal. The image sensor IP may form an imaging surface for imaging the light incident through the first lens 910 to the fifth lens 950.

[0192] The optical imaging system 900 may include an optical path changing mechanism. For example, the optical imaging system 900 may include a prism that reflects or refracts the incident light in a direction intersecting the optical path of the incident light.

[0193] Table 17 shows the lens characteristics of the optical imaging system 900, and Table 18 shows the aspherical values of the optical imaging system 900. Figure 18 is the aberration curve of the optical imaging system 900 configured as described above.

[0194] Table 17

[0195]

[0196]

[0197] Table 18

[0198] Aspherical Constant S5 S6 S7 S8 S9 K -0.60618 -1.21584 -99.00000 0.28176 0.46564 A 0.00083 0.00163 -0.00274 -0.00563 -0.00452 B 0.00005 -0.00001 0.00053 0.00041 0.00079 C 0.00000 0.00000 0.00000 -0.00003 -0.00002 D 0.00000 0.00000 0.00000 0.00001 0.00000 E 0.00000 0.00000 0.00000 0.00000 0.00000 F 0.00000 0.00000 0.00000 0.00000 0.00000 G 0.00000 0.00000 0.00000 0.00000 0.00000 H 0.00000 0.00000 0.00000 0.00000 0.00000 J 0.00000 0.00000 0.00000 0.00000 0.00000 Aspherical Constant S10 S11 S12 S13 S14 K 22.60935 96.09024 0.30520 -1.50913 -53.32311 A -0.00675 -0.00523 -0.00799 -0.01552 -0.00524 B 0.00135 0.00017 0.00253 0.00268 0.00136 C 0.00001 0.00040 0.00079 0.00176 0.00011 D 0.00006 -0.00001 0.00024 0.00000 0.00034 E 0.00001 0.00001 -0.00014 0.00001 0.00002 F -0.00001 -0.00001 0.00000 0.00000 -0.00002 G 0.00000 0.00000 0.00000 0.00000 0.00000 H 0.00000 0.00000 0.00000 0.00000 0.00000 J 0.00000 0.00000 0.00000 0.00000 0.00000

[0199] Table 19 shows the optical characteristics of the optical imaging systems according to the first example to the ninth example.

[0200] Table 19

[0201]

[0202]

[0203] Tables 20 and 21 show the values of the conditional expressions of the optical imaging systems according to the first to ninth examples. As can be seen from Tables 20 and 21, the optical imaging systems according to the first to ninth examples satisfy all of the above conditional expressions.

[0204] Table 20

[0205]

[0206]

[0207] Table 21

[0208]

[0209]

[0210] Hereinafter, reference will be made to Figure 19 and Figure 20 to describe modified examples of the optical imaging system.

[0211] The above optical imaging system according to the first to ninth examples can be configured in the form shown in Figure 19 or Figure 20 For example, the optical imaging system 100 according to the first example includes one prism P1 as shown in Figure 19 or two prisms P1 and P2 as shown in Figure 20 Since the former form allows the optical imaging system 100 to be arranged along the width direction of the portable terminal device, the distance TTL from the object side surface of the first lens to the imaging surface can be sufficiently ensured. Since the latter form can sufficiently ensure the distance BFL from the image side surface of the fifth lens to the imaging surface of the image sensor, it is advantageous for implementing an optical imaging system having a relatively long BFL.

[0212] Next, reference will be made to

[0213] to describe portable terminal devices, each of which has an optical imaging system according to an example of the present disclosure. Figure 21 and Figure 22 The above optical imaging system according to the first to ninth examples and in the form of

[0214] and Figure 19 and Figure 20An optical imaging system configured in the form shown can be installed in a camera module for a portable terminal device. As an example, the optical imaging system 100 according to the first example can be installed in the rear camera module 20 of the portable terminal device 10. As another example, the optical imaging system 100 according to the first example can be installed in one or more of the plurality of camera modules 20, 22, and 24 installed in the portable terminal device 10.

[0215] As described above, it is possible to implement such an optical imaging system that can be installed in a thin and small-sized terminal device while having a long focal length.

[0216] Although the present disclosure includes specific examples, it will be apparent after understanding the disclosure of the present application that various changes in form and detail can be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described in the present application are to be understood in a descriptive sense only and not for purposes of limitation. The description of the features or aspects in each example should be considered applicable to similar features or aspects in other examples. Appropriate results can still be achieved if the described techniques are performed in a different order, and / or if the described components in the system, architecture, device, or circuit are combined in a different way and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of the present disclosure is not limited by the specific embodiments, but is defined 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 the present disclosure.

Claims

1. An optical imaging system, comprising: A first lens having a positive refractive power and a convex object side; A second lens having a negative refractive power; A third lens having a positive refractive power; A fourth lens having a refractive power; And A fifth lens having a refractive power, wherein the first lens to the fifth lens are sequentially arranged from the object side toward the imaging surface, wherein the optical imaging system has a total of five lenses with refractive power, wherein the sign of the refractive power of the fourth lens is different from the sign of the refractive power of the fifth lens, wherein 0.2 < (D23 + D34 + D45) / BFL < 0.5, wherein 0.8 < TTL / f < 0.95, and wherein 2.4 < (V2 + V4) / V3 ≤ 2.6988, wherein D23 is the distance from the image side of the second lens to the object side of the third lens, D34 is the distance from the image side of the third lens to the object side of the fourth lens, D45 is the distance from the image side of the fourth lens to the object side of the fifth lens, BFL is the distance from the image side of the fifth lens to the imaging surface, TTL is the distance from the object side of the first lens to the imaging surface, f is the focal length of the optical imaging system, V2 is the Abbe number of the second lens, V3 is the Abbe number of the third lens, and V4 is the Abbe number of the fourth lens.

2. The optical imaging system according to claim 1, wherein, The third lens has a convex object side.

3. The optical imaging system according to claim 1, wherein The fourth lens has a convex object side.

4. The optical imaging system according to claim 1, wherein, The fourth lens has a concave object side.

5. The optical imaging system according to claim 1, wherein, The fifth lens has a convex object side.

6. The optical imaging system according to claim 1, wherein, The fifth lens has a concave object side.

7. An optical imaging system, comprising: A first lens having a positive refractive power, a convex object side and a convex image side; A second lens having a negative refractive power and a concave object side; A third lens having a positive refractive power; A fourth lens having a refractive power; And A fifth lens having a refractive power, wherein the first lens to the fifth lens are sequentially arranged from the object side toward the imaging surface, wherein the optical imaging system has a total of five lenses with refractive power, wherein the sign of the refractive power of the fourth lens is different from the sign of the refractive power of the fifth lens, wherein 0.2 < (D23 + D34 + D45) / BFL < 0.5, and wherein 0.8 < TTL / f < 0.95, wherein D23 is the distance from the image side of the second lens to the object side of the third lens, D34 is the distance from the image side of the third lens to the object side of the fourth lens, D45 is the distance from the image side of the fourth lens to the object side of the fifth lens, BFL is the distance from the image side of the fifth lens to the imaging surface, TTL is the distance from the object side of the first lens to the imaging surface, f is the focal length of the optical imaging system.

8. The optical imaging system according to claim 7, wherein, The third lens has a convex object side.

9. The optical imaging system according to claim 7, wherein, The fourth lens has a convex object side.

10. The optical imaging system according to claim 7, wherein, The fourth lens has a concave object side.

11. The optical imaging system according to claim 7, wherein, The fifth lens has a convex object side.

12. The optical imaging system according to claim 7, wherein, The fifth lens has a concave object side.

Images