Optical imaging system

Abstract

An optical imaging system includes a reflecting member having a reflecting surface for changing an optical path of light; a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens; a fourth lens; and a fifth lens. The first lens to the fifth lens are sequentially disposed from an object side along an optical axis, and each is disposed closer to an image sensor than the reflecting member. The optical imaging system satisfies 0.2 mm < C1.0 < 0.3 mm, where C1.0 is a distance by which the image sensor moves in a direction perpendicular to the optical axis with respect to a shake amount of 1.0° measured by a shake detection unit.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2019-0112384, filed with the Korean Intellectual Property Office on September 10, 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 used in portable electronic devices such as smartphones, and the miniaturization of cameras installed in portable electronic devices is also required due to the need for miniaturization of portable electronic devices.

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

[0006] However, when multiple lenses are arranged along the thickness direction of a portable electronic device, the thickness of the portable electronic device increases with the increase in the number of lenses, and therefore, there are problems in miniaturizing the portable electronic device.

[0007] Specifically, due to the relatively long focal length of telephoto cameras, there may be issues with their application in thin, portable electronic devices.

[0008] Furthermore, in the case of cameras with image correction capabilities, it is typically necessary to move a lens module that includes multiple lenses. In this situation, there is an issue of increased power consumption due to the weight of the lens module. Summary of the Invention

[0009] 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.

[0010] An optical imaging system is provided that can be mounted in a portable electronic device having a relatively reduced thickness and a relatively long focal length.

[0011] In one general aspect, an optical imaging system includes a reflecting member having a reflecting surface that changes the optical path of light; a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens; a fourth lens; and a fifth lens. The first lens to the fifth lens are sequentially arranged along the optical axis from the object side, and each is arranged closer to the image sensor than the reflecting member. The optical imaging system satisfies 0.2 mm < C1.0 < 0.3 mm, where C1.0 is the distance that the image sensor moves in a direction perpendicular to the optical axis with respect to the amount of shake of 1.0° measured by the shake detection unit.

[0012] The optical imaging system may satisfy 0.1 < L1S1 / f < 1, where L1S1 is the radius of curvature of the object side surface of the first lens, and f is the total focal length of the optical imaging system.

[0013] The optical imaging system may satisfy -2.0 < (L1S1 + L1S2) / (L1S1 - L1S2) < -0.1, where L1S2 is the radius of curvature of the image side surface of the first lens.

[0014] The optical imaging system may satisfy -2.0 < L3S2 / f < -0.1, where L3S2 is the radius of curvature of the image side surface of the third lens, and f is the total focal length of the optical imaging system.

[0015] The optical imaging system may satisfy -20.0 < (L3S1 + L3S2) / (L3S1 - L3S2) < -0.1, where L3S1 is the radius of curvature of the object side surface of the third lens.

[0016] The optical imaging system may satisfy 0.1 < f / f1 < 5.0, where f is the total focal length of the optical imaging system, and f1 is the focal length of the first lens.

[0017] The optical imaging system may satisfy -1.0 < f / f3 < -0.1, where f is the total focal length of the optical imaging system, and f3 is the focal length of the third lens.

[0018] The optical imaging system may satisfy -1.0 < f / f4 < -0.1, where f is the total focal length of the optical imaging system, and f4 is the focal length of the fourth lens.

[0019] The optical imaging system may satisfy 0.1 < f / f5 < 2.0, where f is the total focal length of the optical imaging system, and f5 is the focal length of the fifth lens.

[0020] The optical imaging system may satisfy 0.5 < BFL / TTL < 0.7, where TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the image sensor, and BFL is the distance on the optical axis from the image side surface of the fifth lens to the imaging surface of the image sensor.

[0021] The optical imaging system can satisfy 1.8 < TTL / (2×IMG HT) < 2.2, where TTL is the distance from the object side surface of the first lens to the imaging surface of the image sensor on the optical axis, and IMG HT is half of the diagonal length of the imaging surface of the image sensor.

[0022] The optical imaging system can satisfy 0.8 < TTL / f < 1.1, where TTL is the distance from the object side surface of the first lens to the imaging surface of the image sensor on the optical axis, and f is the total focal length of the optical imaging system.

[0023] The optical imaging system can satisfy f1 / |f23| < 1.0, where f1 is the focal length of the first lens, and f23 is the combined focal length of the second lens and the third lens.

[0024] The optical imaging system can satisfy 0.1 mm < C0.5 < 0.2 mm, where C0.5 is the distance that the image sensor moves in a direction perpendicular to the optical axis with respect to the amount of jitter of 0.5° measured by the jitter detection unit.

[0025] The optical imaging system can satisfy 0.35 mm < C1.5 < 0.45 mm, where C1.5 is the distance that the image sensor moves in a direction perpendicular to the optical axis with respect to the amount of jitter of 1.5° measured by the jitter detection unit.

[0026] The optical imaging system can satisfy 0.5 mm < C2.0 < 0.6 mm, where C2.0 is the distance that the image sensor moves in a direction perpendicular to the optical axis with respect to the amount of jitter of 2.0° measured by the jitter detection unit.

[0027] In another general aspect, the optical imaging system includes: a reflection member for changing the optical path of light; a first lens; a second lens; a third lens; a fourth lens; a fifth lens; an image sensor; and a jitter detection unit for measuring the amount of jitter of the optical imaging system when capturing an image. The first lens to the fifth lens are sequentially arranged along the optical axis from the object side, and each is arranged between the image sensor and the reflection member along the optical axis. The optical imaging system satisfies 0.13 mm < C < 0.523 mm, where C is the distance that the image sensor moves in a direction perpendicular to the optical axis when the amount of jitter measured by the jitter detection unit is between 0.5° and 2.0° (including 0.5° and 2.0°).

[0028] According to the following detailed description, the drawings, and the appended claims, other features and aspects will become apparent. Description of the Drawings

[0029] Figure 1 is a configuration diagram of an optical imaging system according to a first example.

[0030] Figure 2 It is shown Figure 1 The curves showing the aberration characteristics of the optical imaging system are shown.

[0031] Figure 3 It is a configuration diagram of the optical imaging system based on the second example.

[0032] Figure 4 It is shown Figure 3 The curves showing the aberration characteristics of the optical imaging system are shown.

[0033] Figure 5 It is a configuration diagram of the optical imaging system based on the third example.

[0034] Figure 6 It is shown Figure 5 The curves showing the aberration characteristics of the optical imaging system are shown.

[0035] 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

[0036] 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 readily apparent to those skilled in the art. The sequence 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 varied, as will be readily 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.

[0037] 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.

[0038] 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.

[0039] Throughout this specification, when an element such as a layer, region, or substrate is described as being "on," "connected to," or "attached to" another element, the element may be directly "on," directly "connected to," or directly "attached to" the other element, or there may be one or more other elements between the element and the other element. Conversely, when an element is described as being "directly on," "directly connected to," or "directly attached to" another element, there may be no other elements between the element and the other element.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] The accompanying drawings may not be drawn to scale, and for clarity, illustration, and convenience, the relative dimensions, scale, and depiction of elements in the drawings may be exaggerated.

[0047] In the lens configuration diagrams below, for illustrative purposes, the thickness, size, and shape of the lenses are shown as slightly exaggerated. Specifically, the shapes of spherical or aspherical surfaces presented in the lens configuration diagrams are provided as examples, and the shapes of the spherical or aspherical surfaces are not limited thereto.

[0048] An optical imaging system according to the example may include multiple lenses arranged along the optical axis. The multiple lenses may be spaced apart from each other by a predetermined distance along the optical axis.

[0049] As an example, an optical imaging system may include five lenses.

[0050] 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.

[0051] Furthermore, in each lens, the first surface refers to the surface (or object-side surface) closer to the object, while the second surface refers to the surface (or image-side surface) closer to the image. Additionally, in this specification, the values ​​for the lens's radius of curvature, thickness, etc., are all in mm, and the unit for angle measurement is degrees.

[0052] Furthermore, in the description of the shape of each lens, a surface that is convex means that the paraxial region of the surface is convex, and a surface that is concave means that the paraxial region of the surface is concave.

[0053] The paraxial region refers to the relatively narrow area near the optical axis.

[0054] The optical imaging system shown in the example includes five lenses.

[0055] For example, an optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially from the object side.

[0056] However, the optical imaging system described in the example may include not only five lenses, but also other components.

[0057] For example, an optical imaging system may also include a reflective element having a reflective surface that alters the optical path. For example, the reflective element may be a mirror or a prism.

[0058] The reflecting member is positioned closer to the object side than any of the 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.

[0059] Light incident on the reflecting member can be bent to be guided to the first to fifth lenses.

[0060] In addition, the optical imaging system may also include an image sensor for converting an incident image of the object into an electrical signal.

[0061] In addition, the optical imaging system may also include an infrared blocking filter (hereinafter referred to as the "filter") for blocking infrared light. The filter is positioned between the lens (fifth lens) closest to the image sensor and the image sensor.

[0062] All lenses constituting the optical imaging system according to the example can be formed of plastic material.

[0063] The optical imaging system according to the example is configured such that the image sensor can be moved to correct image jitter. As an example, the image sensor of the optical imaging system according to the example can be moved in a direction perpendicular to the optical axis.

[0064] For example, when image capture is affected by hand tremors or other factors, the tremors can be corrected by applying a relative displacement to the image sensor that corresponds to the tremors.

[0065] Although not shown in the accompanying drawings, a jitter correction unit can be configured to move the image sensor, and the jitter correction unit may include a VCM actuator using a magnet and a coil.

[0066] Based on the detection signal from the jitter detection unit (e.g., a gyroscope sensor), the image sensor of the optical imaging system can move in a direction perpendicular to the optical axis.

[0067] Each of the multiple lenses may have at least one aspherical surface.

[0068] For example, at least one of the first and second surfaces of the first to fifth lenses can be aspherical. In this case, the aspherical surface of the first to fifth lenses is represented by Equation 1.

[0069]

[0070] In Equation 1, c is the curvature of the lens (the reciprocal of the radius of curvature), K is the quadratic constant, and Y represents the distance from any point on the aspherical surface of the lens to the optical axis. Furthermore, constants A to E represent the aspherical coefficients. Z represents the distance from any point on the aspherical surface of the lens to the vertex of the aspherical surface (SAG).

[0071] The optical imaging system described in the example can satisfy at least one of the following conditional expressions.

[0072] Conditional expression 1: 0.1mm <C0.5<0.2mm

[0073] Conditional expression 2: 0.2mm <C1.0<0.3mm

[0074] Conditional expression 3: 0.35mm <C1.5<0.45mm

[0075] Conditional expression 4: 0.5mm <C2.0<0.6mm

[0076] Conditional expression 5: 0.1 <L1S1 / f<1

[0077] Conditional expression 6: -2.0 < (L1S1 + L1S2) / (L1S1 - L1S2) < -0.1

[0078] Conditional expression 7: -2.0 <L3S2 / f<-0.1

[0079] Conditional expression 8: -20.0 < (L3S1 + L3S2) / (L3S1 - L3S2) < -0.1

[0080] Conditional expression 9: 0.1 <f / f1<5.0

[0081] Conditional expression 10: -1.0 <f / f3<-0.1

[0082] Conditional expression 11: -1.0 <f / f4<-0.1

[0083] Conditional expression 12: 0.1 <f / f5<2.0

[0084] Conditional expression 13: 0.5 <BFL / TTL<0.7

[0085] Conditional expression 14: 1.8 <TTL / (2×IMG HT)<2.2

[0086] Conditional expression 15: 0.8 <TTL / f<1.1

[0087] Conditional expression 16: f1 / |f23|<1.0

[0088] In the conditional expression, C0.5 is the distance the image sensor moves relative to a jitter of 0.5°, C1.0 is the distance the image sensor moves relative to a jitter of 1.0°, C1.5 is the distance the image sensor moves relative to a jitter of 1.5°, and C2.0 is the distance the image sensor moves relative to a jitter of 2.0°.

[0089] In this case, the jitter amount can be the jitter amount of the image measured by a jitter detection unit (e.g., a gyroscope sensor), and the movement distance of the image sensor can indicate the movement distance in the direction perpendicular to the optical axis.

[0090] In the conditional expression, L1S1 is the radius of curvature of the object-side surface of the first lens, L1S2 is the radius of curvature of the image-side surface of the first lens, L3S1 is the radius of curvature of the object-side surface of the third lens, and L3S2 is the radius of curvature of the image-side surface of the third lens.

[0091] In the conditional expression, f1 is the focal length of the first lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f23 is the combined focal length of the second and third lenses, and f is the total focal length of the optical imaging system.

[0092] In the conditional expression, BFL is the distance on the optical axis from the image side of the fifth lens to the imaging surface of the image sensor, and TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the image sensor.

[0093] In the conditional expression, IMG HT is half the diagonal length of the imaging surface of the image sensor.

[0094] Next, the first to fifth lenses constituting the optical imaging system according to the example will be described.

[0095] The first lens has positive refractive power. Furthermore, both surfaces of the first lens can be convex. Specifically, the first and second surfaces of the first lens can be convex.

[0096] 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.

[0097] The second lens has negative refractive power. Furthermore, the second lens can have a meniscus shape that convexes towards the object. In other words, the first surface of the second lens can be convex, and the second surface of the second lens can be concave.

[0098] 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.

[0099] The third lens has negative refractive power. Furthermore, the third lens can have a meniscus shape that convexes towards the image side. Specifically, the first surface of the third lens can be concave, and the second surface of the third lens can be convex.

[0100] 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.

[0101] The fourth lens has negative refractive power. Furthermore, the fourth lens may have a meniscus shape that convexes towards the image side. Specifically, the first surface of the fourth lens may be concave, and the second surface of the fourth lens may be convex.

[0102] 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.

[0103] The fifth lens has positive refractive power. Furthermore, the fifth lens can have a meniscus shape that convexes towards the object. Specifically, the first surface of the fifth lens can be convex, and the second surface of the fifth lens can be concave.

[0104] 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.

[0105] Among the first to fifth lenses, the first lens has the absolute value of the minimum focal length.

[0106] Among the first to fifth lenses, the third lens has the absolute value of the maximum focal length.

[0107] The combined focal length of the second and third lenses has a value less than 0 (e.g., negative refractive power). Both the second and third lenses may have negative refractive power, but examples are not limited to this. For instance, the third lens may have positive refractive power within the range where the combined focal length of the second and third lenses has a value less than zero.

[0108] The optical imaging system described in the example features a telephoto lens with a relatively narrow field of view and a relatively long focal length.

[0109] Reference Figure 1 and Figure 2 Describe the optical imaging system according to the first example.

[0110] The optical imaging system according to the first example includes 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.

[0111] The optical imaging system may also include a reflective member R, which is positioned closer to the object side than the first lens 110 and has a reflective surface that alters the optical path. In the first example, the reflective member R may be a prism or a mirror.

[0112] The lens characteristics of each lens, such as radius of curvature, lens thickness or distance between lenses, refractive index, Abbe number, and focal length, are shown in Table 1.

[0113] Table 1

[0114]

[0115]

[0116] According to the first example, the total focal length f of the optical imaging system is 15mm, the BFL is 9.154mm, the TTL is 15.999mm, and the IMG HT is 4.2mm.

[0117] The combined focal length of the second lens 120 and the third lens 130 is -8.6322mm (f23).

[0118] In the first example, the first lens 110 has positive refractive power, and the first and second surfaces of the first lens 110 are convex.

[0119] The second lens 120 has negative refractive power, the first surface of the second lens 120 is convex, and the second surface of the second lens 120 is concave.

[0120] The third lens 130 has negative refractive power, the first surface of the third lens 130 is concave, and the second surface of the third lens 130 is convex.

[0121] The fourth lens 140 has negative refractive power, the first surface of the fourth lens 140 is concave, and the second surface of the fourth lens 140 is convex.

[0122] The fifth lens 150 has positive refractive power, the first surface of the fifth lens 150 is convex, and the second surface of the fifth lens 150 is concave.

[0123] Each surface of the first lens 110 to the fifth lens 150 has an aspherical surface coefficient as shown in Table 2. For example, the object-side surface and the image-side surface of the first lens 110 to the fifth lens 150 are both aspherical surfaces.

[0124] Table 2

[0125]

[0126]

[0127] Furthermore, the optical imaging system configured as described above can have Figure 2 The aberration characteristics shown are illustrated.

[0128] Reference Figure 3 and Figure 4 Describe the optical imaging system according to the second example.

[0129] The optical imaging system according to the second example includes 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.

[0130] The optical imaging system 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 optical path. In the second example, the reflective member R may be a prism or a mirror.

[0131] Table 3 shows the lens characteristics of each lens, such as radius of curvature, lens thickness or distance between lenses, refractive index, Abbe number, and focal length.

[0132] Table 3

[0133]

[0134]

[0135] According to the second example, the optical imaging system has a total focal length f of 15mm, a BFL of 8.902mm, a TTL of 16.272mm, and an IMG HT of 4.0mm.

[0136] In the second example, the first lens 210 has positive refractive power, and the first and second surfaces of the first lens 210 are convex.

[0137] The second lens 220 has negative refractive power, the first surface of the second lens 220 is convex, and the second surface of the second lens 220 is concave.

[0138] The third lens 230 has negative refractive power, the first surface of the third lens 230 is concave, and the second surface of the third lens 230 is convex.

[0139] The fourth lens 240 has negative refractive power, the first surface of the fourth lens 240 is concave, and the second surface of the fourth lens 240 is convex.

[0140] The fifth lens 250 has positive refractive power, the first surface of the fifth lens 250 is convex, and the second surface of the fifth lens 250 is concave.

[0141] Each surface of the first lens 210 to the fifth lens 250 has an aspherical surface coefficient as shown in Table 4. For example, the object-side surface and the image-side surface of the first lens 210 to the fifth lens 250 are both aspherical surfaces.

[0142] Table 4

[0143]

[0144]

[0145] Furthermore, the optical imaging system configured as described above can have Figure 4 The aberration characteristics shown are illustrated.

[0146] Reference Figure 5 and Figure 6 Describe the optical imaging system according to the third example.

[0147] The optical imaging system according to the third example includes 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.

[0148] The optical imaging system 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 optical path. In the third example, the reflective member R may be a prism or a mirror.

[0149] Table 5 shows the lens characteristics of each lens, such as radius of curvature, lens thickness or distance between lenses, refractive index, Abbe number, and focal length.

[0150] Table 5

[0151]

[0152]

[0153] According to the third example, the total focal length f of the optical imaging system is 15mm, BFL is 8.567mm, TTL is 16.235mm, and IMG HT is 4.2mm.

[0154] In the third example, the first lens 310 has positive refractive power, and the first and second surfaces of the first lens 310 are convex.

[0155] The second lens 320 has negative refractive power, the first surface of the second lens 320 is convex, and the second surface of the second lens 320 is concave.

[0156] The third lens 330 has negative refractive power, the first surface of the third lens 330 is concave, and the second surface of the third lens 330 is convex.

[0157] The fourth lens 340 has negative refractive power, the first surface of the fourth lens 340 is concave, and the second surface of the fourth lens 340 is convex.

[0158] 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.

[0159] Each surface of the first lens 310 to the fifth lens 350 has an aspherical surface coefficient as shown in Table 6. For example, the object-side surface and the image-side surface of the first lens 310 to the fifth lens 350 are both aspherical surfaces.

[0160] Table 6

[0161] S4 -0.632149 0.0008137 7.83E-06 4.60E-06 -4.53E-07 3.71E-09 S5 0 -0.000197 3.55E-05 -1.04E-05 8.25E-07 -3.54E-08 S6 0 -3.65E-03 -5.31E-05 7.20E-06 -4.57E-07 0 S7 0 -0.003515 6.96E-06 1.74E-05 -2.81E-06 0 S8 0 2.46E-03 2.80E-03 -6.76E-04 6.11E-05 0 S9 0 -1.26E-03 0.0036059 -0.001124 1.04E-04 -6.92E-06 S10 0 1.70E-02 -0.003299 0.0004748 -7.03E-05 -1.05E-06 S11 -3.02E+00 -3.33E-04 -0.00015 1.02E-04 -1.18E-05 1.14E-06 S12 0 -1.40E-02 1.99E-03 -1.68E-04 8.16E-06 -1.78E-07 S13 0 -6.56E-03 5.30E-04 5.37E-05 -1.01E-05 8.18E-07

[0162] Furthermore, the optical imaging system configured as described above can have Figure 6 The aberration characteristics shown are illustrated.

[0163] Table 7

[0164] 0.5 degrees 0.130mm 1.0 degrees 0.261mm 1.5 degrees 0.392mm 2.0 degrees 0.523mm

[0165] Table 7 shows the movement distance of the image sensor, depending on the amount of jitter measured in the optical imaging systems according to the first to third examples.

[0166] As described above, the optical imaging system according to the example can be installed in a portable electronic device with a relatively reduced thickness and can have a long focal length.

[0167] While this disclosure includes specific examples, it will be apparent to those skilled in the art 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 should be understood in a descriptive sense only and not for limiting purposes. The description of features and aspects in each example should be understood as applicable to similar features or aspects in other examples. Suitable results may still be achieved if the described techniques are performed in a different order and / or if components in the described system, architecture, device, or circuit are combined differently 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 changes within the scope of the claims and their equivalents should be understood to be included in this disclosure.

Claims

1. An optical imaging system, including: A reflective member, including a reflective surface configured to alter the optical path of light; The first lens has positive refractive power, with a convex object-side surface and a convex image-side surface; The second lens has negative refractive power, with a convex object side and a concave image side; The third lens has negative refractive power, with a concave object side and a convex image side; The fourth lens has negative refractive power, with a concave object-side surface and a convex image-side surface; as well as The fifth lens has positive refractive power, with a convex object-side surface and a concave image-side surface. The first to the fifth lenses are arranged sequentially along the optical axis from the object side, and each of the first to the fifth lenses is positioned closer to the image sensor than the reflecting member. The optical imaging system has a total of five lenses, and Where -2.0 < L3S2 / f < -0.1, where L3S2 is the radius of curvature of the image-side surface of the third lens, and f is the total focal length of the optical imaging system.

2. The optical imaging system according to claim 1, wherein, 4.44597 / 15 ≤ L1S1 / f ≤ 4.58468 / 15, where L1S1 is the radius of curvature of the object-side surface of the first lens.

3. The optical imaging system according to claim 2, wherein, -57.19201 / 66.36137 ≤ (L1S1+L1S2) / (L1S1-L1S2) ≤ -44.67521 / 53.56715, where L1S2 is the radius of curvature of the image-side surface of the first lens.

4. The optical imaging system according to claim 1, wherein, -20.0 < (L3S1+L3S2) / (L3S1-L3S2) <-0.1, where L3S1 is the radius of curvature of the object-side surface of the third lens.

5. The optical imaging system according to claim 1, wherein, 15 / 8.0553 ≤ f / f1 ≤ 15 / 7.7108, where f1 is the focal length of the first lens.

6. The optical imaging system according to claim 1, wherein, 15 / -72.7400 ≤ f / f3 ≤ 15 / -90.6914, where f3 is the focal length of the third lens.

7. The optical imaging system according to claim 1, wherein, 15 / -35.5665 ≤ f / f4 ≤ 15 / -53.0231, where f4 is the focal length of the fourth lens.

8. The optical imaging system according to claim 1, wherein, 15 / 19.2670 ≤ f / f5 ≤ 15 / 16.9720, where f5 is the focal length of the fifth lens.

9. The optical imaging system according to claim 1, wherein, 8.567 / 16.235 ≤ BFL / TTL ≤ 9.154 / 15.999, where TTL is the distance from the object-side surface of the first lens to the imaging surface of the image sensor on the optical axis, and BFL is the distance from the image-side surface of the fifth lens to the imaging surface of the image sensor on the optical axis.

10. The optical imaging system according to claim 1, wherein, 1.8 < TTL / (2×IMG HT) < 2.2, where TTL is the distance from the object side of the first lens to the imaging surface of the image sensor on the optical axis, and IMG HT is half the diagonal length of the imaging surface of the image sensor.

11. The optical imaging system according to claim 1, wherein, 15.999 / 15 ≤ TTL / f ≤ 16.272 / 15, where TTL is the distance from the object side of the first lens to the imaging surface of the image sensor on the optical axis.

12. The optical imaging system according to claim 1, wherein, At least one surface of the first lens to the fifth lens is an aspherical surface.

Images