Optical imaging systems and portable electronic devices

Abstract

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 to the imaging surface, wherein at least one of the first to fifth lenses includes an aspherical surface, and wherein the ratio of the distance TTL from the object side of the first lens to the imaging surface to half the diagonal length of the imaging surface, IMG_HT, is TTL / IMG_HT, which is 11 or greater. This application also relates to a portable electronic device including three or more camera modules, wherein a first camera module in the camera module includes the aforementioned optical imaging system.

Description

[0001] Cross - reference to related applications

[0002] This application claims the priority benefit of Korean Patent Application No. 10 - 2019 - 0107669, filed on August 30, 2019, with the Korean Intellectual Property Office, and 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] In an optical system in which multiple lenses are arranged along an optical axis, the total length of the optical system generally increases as the number of lenses increases. For example, an optical imaging system including five lenses is more difficult to miniaturize than an optical imaging system including three lenses. For this reason, it may be impossible to install a telephoto optical system with a long focal length in a thin and portable electronic device. Summary of the invention

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

[0006] In one general aspect, an optical imaging system includes: a prism configured to receive light from an object along a first optical axis and reflect the light along a second optical axis that is substantially perpendicular to the first optical axis; a first lens having a refractive power; a second lens having a refractive power; and a spacing - maintaining member disposed between the first lens and the second lens and configured to maintain a spacing between the first lens and the second lens; wherein the first lens and the second lens are sequentially arranged in ascending numerical order along the second optical axis, wherein the first lens is closest to the prism, when viewed in the direction of the second optical axis, the first lens has a non - circular shape, and the first lens may include an optical portion that represents the lens characteristics of the first lens, when viewed in the direction of the second optical axis, the spacing - maintaining member has a non - circular shape, and the spacing - maintaining member may include a hole having a shape and size that are substantially the same as or similar to the shape and size of the optical portion of the first lens, and a length of the hole in a first direction is greater than a length of the hole in a second direction, wherein the second direction is perpendicular to the first direction and parallel to the first optical axis.

[0007] The condition expression 0.8 < SPY2 / SPX2 < 1.0 can be satisfied, where SPY2 is the length of the hole in the second direction, and SPX2 is the length of the hole in the first direction.

[0008] The object side of the optical portion of the first lens may have a major axis effective radius L1S1el in the first direction and a minor axis effective radius L1S1es in the second direction. The major axis effective radius L1S1el may be greater than the minor axis effective radius L1S1es, and may satisfy the conditional expression 0.65 < L1S1es / L1S1el < 1.0.

[0009] The image side of the optical portion of the first lens may have a major axis effective radius L1S2el in the first direction and a minor axis effective radius L1S2es in the second direction. The major axis effective radius L1S2el may be greater than the minor axis effective radius L1S2es, and may satisfy the conditional expression 0.80 < L1S2es / L1S2el < 1.0.

[0010] The second lens may include an optical portion that exhibits the lens characteristics of the second lens. The object side of the optical portion of the second lens may have a major axis effective radius L2S1el in the first direction and a minor axis effective radius L2S1es in the second direction. The major axis effective radius L2S1el may be greater than the minor axis effective radius L2S1es, and may satisfy the conditional expression 0.85 < L2S1es / L2S1el < 1.0.

[0011] The second lens may include an optical portion that exhibits the lens characteristics of the second lens. The image side of the optical portion of the second lens may have a major axis effective radius L2S2el in the first direction and a minor axis effective radius L2S2es in the second direction. The major axis effective radius L2S2el may be greater than the minor axis effective radius L2S2es, and may satisfy the conditional expression 0.65 < L2S2es / L2S2el < 1.0.

[0012] The prism may include a reflective surface configured to receive light from an object along a first optical axis and reflect the light along a second optical axis. The object side of the optical portion of the first lens may have a major axis effective radius L1S1el in the first direction and a minor axis effective radius L1S1es in the second direction. The major axis effective radius L1S1el may be greater than the minor axis effective radius L1S1es, and may satisfy the conditional expression 0.09 < L1S1el / PTTL < 0.13, where PTTL is the distance along at least the second optical axis from the reflective surface of the prism to the imaging surface of the optical imaging system.

[0013] The prism may include a reflective surface configured to receive light from an object along a first optical axis and reflect the light along a second optical axis. The object side surface of the optical portion of the first lens may have a major-axis effective radius L1S1el in a first direction and a minor-axis effective radius L1S1es in a second direction. The major-axis effective radius L1S1el may be greater than the minor-axis effective radius L1S1es, and may satisfy the conditional expression 0.07 < L1S1es / PTTL < 0.12, where PTTL is the distance along at least the second optical axis from the reflective surface of the prism to the imaging surface of the optical imaging system.

[0014] The prism may include a reflective surface configured to receive light from an object along a first optical axis and reflect the light along a second optical axis. The second lens may include an optical portion exhibiting the lens characteristics of the second lens. The object side surface of the optical portion of the second lens may have a major-axis effective radius L2S1el in a first direction and a minor-axis effective radius L2S1es in a second direction. The major-axis effective radius L2S1el may be greater than the minor-axis effective radius L2S1es, and may satisfy the conditional expression 0.06 < L2S1el / PTTL < 0.11, where PTTL is the distance along at least the second optical axis from the reflective surface of the prism to the imaging surface of the optical imaging system.

[0015] The prism may include a reflective surface configured to receive light from an object along a first optical axis and reflect the light along a second optical axis. The second lens may include an optical portion exhibiting the lens characteristics of the second lens. The object side surface of the optical portion of the second lens may have a major-axis effective radius L2S1el in a first direction and a minor-axis effective radius L2S1es in a second direction. The major-axis effective radius L2S1el may be greater than the minor-axis effective radius L2S1es, and may satisfy the conditional expression 0.06 < L2S1es / PTTL < 0.10, where PTTL is the distance along the second optical axis from the reflective surface of the prism to the imaging surface of the optical imaging system.

[0016] The object side surface of the optical portion of the first lens may have a major-axis effective radius L1S1el in a first direction and a minor-axis effective radius L1S1es in a second direction. The major-axis effective radius L1S1el may be greater than the minor-axis effective radius L1S1es, and may satisfy the conditional expression 1.5 < L1S1el / IMG_HT < 2.2, where IMG_HT is half of the diagonal length of the imaging surface of the optical imaging system.

[0017] The object side of the optical portion of the first lens may have a major-axis effective radius L1S1el in the first direction and a minor-axis effective radius L1S1es in the second direction. The major-axis effective radius L1S1el may be greater than the minor-axis effective radius L1S1es. The image side of the optical portion of the first lens may have a major-axis effective radius L1S2el in the first direction and a minor-axis effective radius L1S2es in the second direction. The major-axis effective radius L1S2el may be greater than the minor-axis effective radius L1S2es, and may satisfy the conditional expression 0.8 < L1R2eMax / L1R1eMax < 1.0, where L1R1eMax is the maximum effective radius of the object side of the optical portion of the first lens and is equal to the major-axis effective radius L1S1el, and L1R2eMax is the maximum effective radius of the image side of the optical portion of the first lens and is equal to L1S2el.

[0018] The image side of the optical portion of the first lens may have a major-axis effective radius L1S2el in the first direction and a minor-axis effective radius L1S2es in the second direction. The major-axis effective radius L1S2el may be greater than the minor-axis effective radius L1S2es, and may satisfy the conditional expression 0.5 < L1R2eMax / IMG_HT < 2.2, where L1R2eMax is the maximum effective radius of the image side of the optical portion of the first lens and is equal to L1S2el, and IMG_HT is half of the diagonal length of the imaging surface of the optical imaging system.

[0019] The first lens may further include a flange portion that does not exhibit the lens characteristics of the first lens and extends from the optical portion of the first lens in a direction away from the second optical axis, and the spacer maintaining member may contact and support the flange portion of the first lens.

[0020] The optical imaging system may further include: a third lens having a refractive power; a fourth lens having a refractive power; a fifth lens having a refractive power; an infrared filter; and an image sensor. The first lens, the second lens, the third lens, the fourth lens, and the fifth lens may be sequentially arranged in ascending numerical order along the second optical axis. The first lens is closest to the prism. The infrared filter may be arranged to receive light from the fifth lens and may be configured to block infrared rays in the light received from the fifth lens to generate filtered light, and the image sensor may be arranged to receive the filtered light from the infrared filter and may be configured to convert the filtered light into an electrical signal.

[0021] The optical imaging system may further include: a second prism configured to receive light from the fifth lens along a second optical axis and reflect the light received from the fifth lens to an infrared filter along a third optical axis that is substantially perpendicular to the second optical axis and substantially parallel to the first optical axis. The infrared filter may be arranged to receive the light from the fifth lens reflected by the second prism along the third optical axis and may be configured to block infrared rays in the light received from the fifth lens to generate filtered light. An image sensor may be arranged to receive the filtered light from the infrared filter along the third optical axis.

[0022] The optical imaging system may further include: a third lens having a refractive power; a fourth lens having a refractive power; a fifth lens having a refractive power; a sixth lens having a refractive power; an infrared filter; and an image sensor. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens may be sequentially arranged in ascending numerical order along the second optical axis, where the first lens is closest to the prism. The infrared filter may be arranged to receive light from the sixth lens and may be configured to block infrared rays in the light received from the sixth lens to generate filtered light. The image sensor may be arranged to receive the filtered light from the infrared filter and may be configured to convert the filtered light into an electrical signal.

[0023] In another general aspect, a portable electronic device includes a wide-angle optical imaging system having a first focal length and a telephoto optical imaging system having a second focal length that is longer than the first focal length. The telephoto optical imaging system includes: a prism configured to receive light from an object along a first optical axis and reflect the light along a second optical axis that is substantially perpendicular to the first optical axis; a first lens having a refractive power; a second lens having a refractive power; and a spacing maintaining member disposed between the first lens and the second lens and configured to maintain the spacing between the first lens and the second lens. The first lens and the second lens are sequentially arranged in ascending numerical order along the second optical axis, where the first lens is closest to the prism. When viewed in the direction of the second optical axis, the first lens has a non-circular shape, and the first lens may include an optical portion that exhibits the lens characteristics of the first lens. When viewed in the direction of the second optical axis, the spacing maintaining member has a non-circular shape, and the spacing maintaining member may include a hole having a shape and size that is substantially the same as or similar to the shape and size of the optical portion of the first lens. The length of the hole in a first direction is greater than the length of the hole in a second direction, and the second direction is perpendicular to the first direction and parallel to the first optical axis.

[0024] The condition expression 0.8 < SPY2 / SPX2 < 1.0 may be satisfied, where SPY2 is the length of the hole in the second direction and SPX2 is the length of the hole in the first direction.

[0025] The object side of the optical portion of the first lens may have a major-axis effective radius L1S1el in a first direction and a minor-axis effective radius L1S1es in a second direction. The major-axis effective radius L1S1el may be greater than the minor-axis effective radius L1S1es and may satisfy the conditional expression 1.5 < L1S1el / IMG_HT < 2.2, where IMG_HT is half of the diagonal length of the imaging surface of the optical imaging system.

[0026] The portable electronic device may further include: a third lens having a refractive power; a fourth lens having a refractive power; a fifth lens having a refractive power; an infrared filter; and an image sensor. The first lens, the second lens, the third lens, the fourth lens, and the fifth lens may be sequentially arranged in ascending numerical order along a second optical axis. The first lens is closest to the prism. The infrared filter may be arranged to receive light from the fifth lens and may be configured to block infrared rays in the light received from the fifth lens to generate filtered light. The image sensor may be arranged to receive the filtered light from the infrared filter and may be configured to convert the filtered light into an electrical signal.

[0027] The portable electronic device may further include: a second prism configured to receive light from the fifth lens along the second optical axis and reflect the light received from the fifth lens to the infrared filter along a third optical axis that is substantially perpendicular to the second optical axis and substantially parallel to the first optical axis. The infrared filter may be arranged to receive the light from the fifth lens reflected by the second prism along the third optical axis and may be configured to block infrared rays in the light received from the fifth lens to generate filtered light. The image sensor may be arranged to receive the filtered light from the infrared filter along the third optical axis.

[0028] In another general aspect, an 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 to the imaging surface. At least one of the first lens to the fifth lens includes an aspherical surface. The ratio TTL / IMG_HT of the distance TTL from the object side of the first lens to the imaging surface to half of the diagonal length IMG_HT of the imaging surface may be 11 or greater.

[0029] In another general aspect, an 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 to the imaging surface. At least one of the first lens to the fifth lens includes an aspherical surface. The ratio L1S2es / L1S2el of the minor-axis effective radius L1S2es to the major-axis effective radius L1S2el of the image side of the first lens may be greater than 0.8 and less than 1.0.

[0030] In another general aspect, the portable electronic device includes three or more camera modules, wherein the optical axis of the first camera module is formed in a direction different from the optical axes of the second and third camera modules, wherein the first camera module includes the optical imaging system and image sensor as described above, and wherein the image sensor is configured to convert light incident through the first to fifth lenses into electrical signals.

[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 This is a configuration diagram of a first example of an optical imaging system.

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

[0034] Figure 3 This is a configuration diagram of a second example of an optical imaging system.

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

[0036] Figure 5 This is a configuration diagram of the third example of an optical imaging system.

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

[0038] Figure 7 This is a configuration diagram of the fourth example of an optical imaging system.

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

[0040] Figure 9 This is a configuration diagram of the fifth example of an optical imaging system.

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

[0042] Figure 11 This is a configuration diagram of the sixth example of an optical imaging system.

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

[0044] Figure 13 This is a configuration diagram of the seventh example of an optical imaging system.

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

[0046] Figure 15 This is a configuration diagram of the eighth example of an optical imaging system.

[0047] Figure 16 It shows Figure 15 The aberration curves of the optical imaging system are shown.

[0048] Figure 17 This is a configuration diagram of the ninth example of an optical imaging system.

[0049] Figure 18 It shows Figure 17 The aberration curves of the optical imaging system are shown.

[0050] Figure 19 This is a configuration diagram of the tenth example of an optical imaging system.

[0051] Figure 20 It shows Figure 19 The aberration curves of the optical imaging system are shown.

[0052] Figure 21 This is a configuration diagram of the eleventh example of an optical imaging system.

[0053] Figure 22 It shows Figure 21 The aberration curves of the optical imaging system are shown.

[0054] Figure 23 This is a plan view of an example of the first lens in an optical imaging system when viewed along the optical axis.

[0055] Figure 24 This is a plan view of an example of a spacing maintenance member disposed between a first lens and a second lens in an optical imaging system when viewed in the direction of the optical axis.

[0056] Figures 25 to 28 This is a rear view of a portable electronic device equipped with multiple optical imaging systems.

[0057] 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

[0058] 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, after understanding the disclosure of this application, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described in this application will be apparent. For example, 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, but can be obviously changed after understanding the disclosure of this application. In addition, for clarity and conciseness, descriptions of functions and structures that are well known to those skilled in the art may be omitted.

[0059] The features described in this application may be implemented in different forms and should not be construed as being limited to the examples described in this application. Rather, the examples described in this application are provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described in this application, which will become apparent upon understanding the disclosure of this application.

[0060] In this application, the term "may" is used in relation to examples or implementations, such as with respect 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 a feature, and that all examples and implementations are not limited thereto.

[0061] 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.

[0062] 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.

[0063] Although terms such as "first," "second," and "third" may be used to describe various elements in this application, these elements are not limited by these terms. Rather, these terms are used only to distinguish one element from another. Therefore, without departing from the teachings of the examples described in this application, the first element mentioned in the examples may also be referred to as the second element.

[0064] 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 “above” and “below” orientations. 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] The first lens is the lens closest to the object (or subject), and the fifth or sixth lens (if any) is the lens closest to the imaging surface (or image sensor).

[0069] The thickness, radius of curvature, distance between the lens and other elements, focal length, PTTL, TTL, BFL, IMG_HT, 2IMG_HT, L1R1eMax, L1R2eMax, L1S1el, L1S1es, L1S2el, L1S2es, L2S1el, L2S1es, L2S2el, and L2S2es are expressed in mm. These quantities are defined later in this application.

[0070] The thickness of the lens and other components, the distance between the lens and other components, PTTL, TTL, and BFL are measured along the optical axis of the optical imaging system.

[0071] Unless otherwise stated, references to the shape of a lens surface refer to the shape of the paraxial region of the lens surface. The paraxial region of a lens surface is the central portion of the lens surface surrounding the optical axis of the lens surface, in which light rays incident on the lens surface make a small angle θ with respect to the optical axis, and the approximations sinθ≈θ, tanθ≈θ, and cosθ≈1 are valid.

[0072] For example, the statement that the object-side surface of a lens is convex means that at least the paraxial region of the object-side surface of the lens is convex, and the statement that the image-side surface of a lens is concave means that at least the paraxial region of the image-side surface of the lens is concave. Therefore, even if the object-side surface of a lens can be described as convex, the entire object-side surface of the lens may not be convex, and the peripheral region of the object-side surface of the lens may be concave. Similarly, even if the image-side surface of a lens can be described as concave, the entire image-side surface of the lens may not be concave, and the peripheral region of the image-side surface of the lens may be convex.

[0073] An optical imaging system includes an optical system having multiple lenses. For example, the optical system of an optical imaging system includes multiple lenses, each having a refractive power. However, an optical imaging system is not limited to lenses with refractive power. For example, an optical imaging system may include a prism for reflecting incident light and an aperture for adjusting the amount of incident light. Additionally, an optical imaging system may include an infrared blocking filter for blocking infrared light. Furthermore, an optical imaging system may include an image sensor (e.g., an imaging device) for converting an image of an object incident through the optical system into an electrical signal. Additionally, an optical imaging system may include a spacing maintenance member for maintaining the distance between two lenses.

[0074] Lenses are made of materials with a refractive index different from that of air. For example, multiple lenses can be made of plastic or glass.

[0075] At least one surface of at least one lens may have an aspherical shape. The aspherical surface of a lens is represented by Equation 1 below.

[0076]

[0077] In Equation 1, c is the curvature of the lens surface and the reciprocal of the radius of curvature of the lens surface at the optical axis of the lens surface, k is the conic constant, r is the distance from any point on the lens surface to the optical axis of the lens surface in a direction perpendicular to the optical axis of the lens surface, A to J are aspherical constants, and Z (also known as sag) is the distance from a point on the lens surface at a distance r from the optical axis of the lens surface to a tangent plane perpendicular to the optical axis and intersecting the vertex of the lens surface in a direction parallel to the optical axis of the lens surface.

[0078] An optical imaging system includes five or more lenses. For example, an optical imaging system may include a first lens, a second lens, a third lens, a fourth lens closest to the object, and a fifth lens closest to the imaging plane, arranged in ascending numerical order from the first lens to the fifth lens. Alternatively, an optical imaging system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens closest to the object, and a sixth lens closest to the imaging plane, arranged in ascending numerical order from the first lens to the sixth lens.

[0079] Each of the first to fifth lenses or the first to sixth lenses can be spaced apart from each other. For example, the image-side of the first lens does not contact the object-side of the second lens, and the image-side of the second lens does not contact the object-side of the third lens.

[0080] The first lens has a predetermined refractive power. For example, the first lens may have positive refractive power. The first lens has a convex surface. For example, the first lens may have a convex object-side surface. The first lens has a predetermined refractive index. For example, the first lens may have a refractive index less than 1.6. The first lens has a predetermined focal length. For example, the focal length of the first lens may be determined to be in the range of 7.0 mm to 18.0 mm.

[0081] The second lens has a predetermined refractive power. For example, the second lens may have positive or negative refractive power. The second lens has a concave surface. For example, the second lens may have either a concave object-side surface or a concave image-side surface, or both. Alternatively, if six lenses are present, the second lens has a convex surface. For example, the second lens may have a convex object-side surface and a convex image-side surface. The second lens has a predetermined refractive index. For example, the second lens may have a refractive index of 1.6 or greater but less than 1.8. Alternatively, if six lenses are present, the second lens may have a refractive index of 1.5 or greater but less than 1.8.

[0082] The third lens has a predetermined refractive power. For example, the third lens may have positive or negative refractive power. The third lens has a convex surface. For example, the third lens may have a convex object-side surface or a convex image-side surface. The third lens has a predetermined refractive index. For example, the third lens may have a refractive index of 1.6 or greater and 2.0 or less.

[0083] The fourth lens has a predetermined refractive power. For example, the fourth lens may have positive or negative refractive power. The fourth lens has a convex surface. For example, the fourth lens may have a convex image-side surface. The fourth lens has a predetermined refractive index. For example, the fourth lens may have a refractive index of 1.6 or greater but less than 1.8.

[0084] The fifth lens has a predetermined refractive power. For example, the fifth lens may have positive or negative refractive power. The fifth lens has a concave surface. For example, the fifth lens may have a concave object-side surface or a concave image-side surface. The fifth lens has a predetermined refractive index. For example, the fifth lens may have a refractive index of 1.5 or greater but less than 1.8.

[0085] The sixth lens has a predetermined refractive power. For example, the sixth lens may have positive refractive power. The sixth lens has a convex surface. For example, the sixth lens may have a convex image-side surface. The sixth lens has a predetermined refractive index. For example, the sixth lens may have a refractive index of 1.0 or greater and 1.6 or less.

[0086] One or more of the first to sixth lenses may have a shape in which the effective radius or diameter of the lens in a first direction intersecting the optical axis is different from the effective radius or diameter of the lens in a second direction intersecting the optical axis and perpendicular to the first direction.

[0087] Optical imaging systems may include lenses made of plastic. For example, at least one of the five or six lenses in an optical imaging system may be made of plastic material.

[0088] Optical imaging systems may include aspherical lenses. For example, at least one of the five or six lenses in an optical imaging system may be an aspherical lens.

[0089] An optical imaging system may include optical elements configured to fold the optical path within the system. For example, the system may include a prism configured to reflect light. The prism may be disposed on the object side of a first lens. The prism may be made of a material having a relatively low Abbe number. For example, the prism may be made of a material having an Abbe number of 60 or less.

[0090] Optical imaging systems include filters and image sensors, and may include aperture stops.

[0091] The filter is disposed between the image sensor and the lens closest to the image sensor. The filter blocks a wavelength range of the incident light to improve the resolution of the optical imaging system. For example, the filter may block the infrared wavelength of the incident light.

[0092] The optical imaging system includes a spacing maintaining member.

[0093] The spacing maintaining member is disposed between two lenses to maintain the spacing between the two lenses. For example, the spacing maintaining member may be disposed between the first lens and the second lens. A hole is formed in the spacing maintaining member. The hole may have a shape including a long axis and a short axis. For example, the hole may have an elliptical shape, a rectangular shape with rounded corners, or any other shape having a long axis and a short axis. The length of the hole in the short axis direction may be 0.8 times or more and less than 1.0 times the length of the hole in the long axis direction.

[0094] The optical imaging system may satisfy any one or any two or more of the following conditional expressions 1 to 9.

[0095] 2.8 ≤ f-number (conditional expression 1)

[0096] 3.2 < Nd2 + Nd3 (conditional expression 2)

[0097] 0 mm < f1 + f2 < 32 mm (conditional expression 3)

[0098] 0 ≤ D12 / f ≤ 0.05 (conditional expression 4)

[0099] 0.5 < L1R2eMax / IMG_HT < 2.2 (conditional expression 5)

[0100] 0.8 < L1R2eMax / L1R1eMax < 1.0 (conditional expression 6)

[0101] 0.8 ≤ TTL / f ≤ 1.0 (conditional expression 7)

[0102] 11 ≤ TTL / IMG_HT (conditional expression 8)

[0103] 0.2 ≤ L1R1 / f ≤ 0.3 (conditional expression 9)

[0104] In the above conditional expressions 1 to 9, the f-number is the f-number of the optical imaging system and is equal to the focal length f of the optical imaging system divided by the entrance pupil diameter of the optical imaging system, Nd2 is the refractive index of the second lens, Nd3 is the refractive index of the third lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, D12 is the distance along the optical axis from the image side surface of the first lens to the object side surface of the second lens, f is the focal length of the optical imaging system, L1R1eMax is the maximum effective radius of the object side surface of the first lens, L1R2eMax is the maximum effective radius of the image side surface of the first lens, TTL is the distance along the optical axis from the object side surface of the first lens to the imaging surface, IMG_HT is half of the diagonal length of the imaging surface, and L1R1 is the curvature radius of the object side surface of the first lens.

[0105] In addition, the optical imaging system may also satisfy any one or any two or more of the following conditional expressions 10 to 25.

[0106] 0.65 < L1S1es / L1S1el < 1.0 (Conditional Expression 10)

[0107] 0.80 < L1S2es / L1S2el < 1.0 (Conditional Expression 11)

[0108] 0.85 < L2S1es / L2S1el < 1.0 (Conditional Expression 12)

[0109] 0.65 < L2S2es / L2S2el < 1.0 (Conditional Expression 13)

[0110] 8.0 mm < DPL1 < 12.0 mm (Conditional Expression 14)

[0111] 40 mm < PTTL < 70 mm (Conditional Expression 15)

[0112] 0.8 < SPY2 / SPX2 < 1.0 (Conditional Expression 16)

[0113] 1.5 < L1S1el / IMG_HT < 2.2 (Conditional Expression 17)

[0114] 0.09 < L1S1el / PTTL < 0.13 (Conditional Expression 18)

[0115] 0.07 < L1S1es / PTTL < 0.12 (Conditional Expression 19)

[0116] 0.06 < L2S1el / PTTL < 0.11 (Conditional Expression 20)

[0117] 0.06 < L2S1es / PTTL < 0.10 (Conditional Expression 21)

[0118] 0.02 < AL1 / (PTTL) 2 < 0.05 (Conditional Expression 22)

[0119] 10° < 2θ < 92° (Conditional Expression 23)

[0120] 1.0 < 2θ / FOV < 10 (Conditional Expression 24)

[0121] 2 < BFL / 2IMG_HT < 5 (Conditional Expression 25)

[0122] In the above Conditional Expressions 10 to 25, L1S1es is the effective short - axis radius of the object side surface of the first lens, L1S1el is the effective long - axis radius of the object side surface of the first lens (and is the same as L1R1eMax in Conditional Expression 6), L1S2es is the effective short - axis radius of the image side surface of the first lens, L1S2el is the effective long - axis radius of the image side surface of the first lens (and is the same as L1R2eMax in Conditional Expressions 5 and 6), L2S1es is the effective short - axis radius of the object side surface of the second lens, L2S1el is the effective long - axis radius of the object side surface of the second lens, L2S2es is the effective short - axis radius of the image side surface of the second lens, and L2S2el is the effective long - axis radius of the image side surface of the second lens.

[0123] DPL1 is the distance along the optical axis from the image side surface of the prism on the object side of the first lens to the object side surface of the first lens, and PTTL is the distance along the optical axis from the reflecting surface of the prism on the object side of the first lens to the imaging surface.

[0124] SPY2 is the length of the hole of the spacer - maintaining member in the short - axis direction, and SPX2 is the length of the hole of the spacer - maintaining member in the long - axis direction.

[0125] IMG_HT is half of the diagonal length of the imaging surface.

[0126] AL1 is the area of the object side surface of the optical part of the first lens projected onto a plane perpendicular to the optical axis direction. The optical part of the object side surface of the first lens is a part of the object side surface that exhibits the lens characteristics of the first lens. When observed in the optical axis direction, the first lens has a non - circular shape and includes two arcuate side surfaces and two straight side surfaces connecting the two arcuate side surfaces to each other. 2θ is the angle having a vertex on the optical axis of the first lens and corresponding to one of the straight side surfaces.

[0127] FOV is the total angle or total field of view of an optical imaging system, BFL is the distance along the optical axis from the image side of the lens closest to the imaging surface (i.e., the fifth or sixth lens) to the imaging surface, and 2IMG_HT is the diagonal length of the imaging surface.

[0128] The first to eleventh examples of optical imaging systems will be described next.

[0129] Figure 1 This is a configuration diagram of a first example of an optical imaging system, and Figure 2 It shows Figure 1 The aberration curves of the optical imaging system are shown.

[0130] The optical imaging system 100 includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, and a fifth lens 150.

[0131] The first lens 110 has positive refractive power. The first lens 110 has a convex object-side surface and a convex image-side surface. The second lens 120 has negative refractive power. The second lens 120 has a convex object-side surface and a concave image-side surface. The third lens 130 has positive refractive power. The third lens 130 has a convex object-side surface and a convex image-side surface. The fourth lens 140 has negative refractive power. The fourth lens 140 has a concave object-side surface and a convex image-side surface. The fifth lens 150 has positive refractive power. The fifth lens 150 has a convex object-side surface and a concave image-side surface.

[0132] The optical imaging system 100 includes a prism P, a filter 170, and an image sensor 180.

[0133] The optical imaging system 100 includes a prism P as a means for folding the optical path of light in the optical imaging system 100. The prism P folds a first optical axis C1 to form a second optical axis C2. The second optical axis C2 is substantially perpendicular to the first optical axis C1. The prism P is disposed on the object side of the first lens 110 and reflects light reflected from the object to the image sensor 180.

[0134] A filter 170 is positioned in front of the image sensor 180 and blocks infrared light included in the incident light. The image sensor 180 includes multiple optical sensors and is configured to convert optical signals into electrical signals.

[0135] Table 1 below shows the optical characteristics of the components of the optical imaging system 100, and Table 2 below shows the aspherical surface coefficients of the lenses of the optical imaging system 100.

[0136] Table 1

[0137]

[0138]

[0139] Table 2

[0140] Face number k A B C D E F G H J 4 -9.4E-01 2.7E-04 3.2E-05 -7.2E-06 7.3E-07 -2.3E-08 -1.2E-09 1.2E-10 -3.6E-12 3.7E-14 5 0.0E+00 2.9E-03 -1.4E-03 2.8E-04 -3.1E-05 1.9E-06 -7.0E-08 1.4E-09 -1.3E-11 4.6E-14 6 0.0E+00 -6.3E-03 5.2E-04 1.8E-05 -9.6E-06 1.1E-06 -7.4E-08 3.3E-09 -9.6E-11 1.3E-12 7 0.0E+00 -1.4E-02 3.0E-03 -5.0E-04 3.6E-05 1.1E-06 -4.3E-07 3.5E-08 -1.2E-09 1.5E-11 8 0.0E+00 -7.5E-03 6.7E-04 5.6E-05 -2.8E-05 4.8E-06 -5.3E-07 4.1E-08 -1.9E-09 4.0E-11 9 0.0E+00 -5.2E-03 -2.3E-03 1.5E-03 -3.8E-04 5.3E-05 -4.4E-06 2.1E-07 -4.8E-09 4.0E-11 10 0.0E+00 3.0E-03 1.2E-03 -4.3E-04 1.0E-04 -1.8E-05 2.3E-06 -1.8E-07 7.7E-09 -1.4E-10 11 0.0E+00 -4.7E-03 4.8E-03 -2.1E-03 5.3E-04 -8.3E-05 8.1E-06 -4.9E-07 1.7E-08 -2.4E-10 12 0.0E+00 -1.1E-02 5.1E-04 -1.1E-04 6.4E-05 -1.4E-05 1.5E-06 -1.0E-07 3.8E-09 -6.2E-01 13 0.0E+00 -6.8E-03 -1.2E-04 1.2E-04 -1.2E-05 3.8E-07 1.1E-08 -1.7E-09 1.1E-10 -3.5E-12

[0141] Figure 3 This is a configuration diagram of a second example of an optical imaging system, and Figure 4 It shows Figure 3 The aberration curves of the optical imaging system are shown.

[0142] The optical imaging system 200 includes a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, and a fifth lens 250.

[0143] The first lens 210 has positive refractive power. The first lens 210 has a convex object-side surface and a convex image-side surface. The second lens 220 has negative refractive power. The second lens 220 has a convex object-side surface and a concave image-side surface. The third lens 230 has positive refractive power. The third lens 230 has a convex object-side surface and a convex image-side surface. The fourth lens 240 has negative refractive power. The fourth lens 240 has a concave object-side surface and a convex image-side surface. The fifth lens 250 has positive refractive power. The fifth lens 250 has a concave object-side surface and a convex image-side surface.

[0144] The optical imaging system 200 also includes a prism P, a filter 270, and an image sensor 280.

[0145] The optical imaging system 200 includes a prism P as a means for folding the optical path of light in the optical imaging system 200. The prism P folds a first optical axis C1 to form a second optical axis C2. The second optical axis C2 is substantially perpendicular to the first optical axis C1. The prism P is disposed on the object side of the first lens 210 and reflects light reflected from the object to the image sensor 280.

[0146] A filter 270 is positioned in front of the image sensor 280 and blocks infrared radiation included in the incident light. The image sensor 280 includes multiple optical sensors and is configured to convert optical signals into electrical signals.

[0147] Table 3 below shows the optical characteristics of the optical imaging system 200, and Table 4 below shows the aspherical surface coefficients of the lenses of the optical imaging system 200.

[0148] Table 3

[0149]

[0150] Table 4

[0151] Face number k A B C D E F G H J 4 -1.1E+00 9.1E-05 4.1E-05 -1.3E-05 2.3E-06 -2.2E-07 1.2E-08 -4.0E-10 7.0E-12 -5.1E-14 5 0.0E+00 2.5E-03 -1.6E-03 4.3E-04 -6.4E-05 5.7E-06 -3.2E-07 1.1E-08 -2.0E-10 1.6E-12 6 0.0E+00 -2.9E-03 -2.2E-03 1.0E-03 -2.1E-04 2.4E-05 -1.7E-06 6.9E-08 -1.6E-09 1.6E-11 7 0.0E+00 -8.4E-03 -9.2E-04 9.1E-04 -2.6E-04 4.2E-05 -4.2E-06 2.6E-07 -8.9E-09 1.3E-10 8 0.0E+00 -5.7E-03 -6.7E-04 6.5E-04 -2.3E-04 4.7E-05 -6.1E-06 4.6E-07 -1.9E-08 3.3E-10 9 0.0E+00 -5.2E-03 -9.2E-04 5.3E-04 -1.2E-04 1.8E-05 -2.0E-06 1.5E-07 -6.1E-09 1.0E-10 10 0.0E+00 3.0E-03 -3.4E-04 8.0E-04 -3.6E-04 8.0E-05 -1.0E-05 7.5E-07 -2.9E-08 4.8E-10 11 0.0E+00 4.5E-03 -9.7E-03 6.4E-03 -2.1E-03 3.9E-04 -4.3E-05 2.9E-06 -1.0E-07 1.6E-09 12 0.0E+00 1.7E-02 -1.4E-02 7.5E-03 -2.1E-03 3.7E-04 -3.8E-05 2.4E-06 -8.5E-08 1.3E-09 13 0.0E+00 1.2E-02 -1.7E-03 3.1E-04 1.1E-05 -1.7E-05 3.0E-06 -2.4E-07 9.7E-09 -1.5E-10

[0152] Figure 5 This is a configuration diagram of a third example of an optical imaging system, and Figure 6 It shows Figure 5 The aberration curves of the optical imaging system are shown.

[0153] The optical imaging system 300 includes a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, and a fifth lens 350.

[0154] The first lens 310 has positive refractive power. The first lens 310 has a convex object-side surface and a convex image-side surface. The second lens 320 has negative refractive power. The second lens 320 has a convex object-side surface and a concave image-side surface. The third lens 330 has positive refractive power. The third lens 330 has a convex object-side surface and a convex image-side surface. The fourth lens 340 has negative refractive power. The fourth lens 340 has a concave object-side surface and a convex image-side surface. The fifth lens 350 has negative refractive power. The fifth lens 350 has a concave object-side surface and a convex image-side surface.

[0155] The optical imaging system 300 also includes a prism P, a filter 370, and an image sensor 380.

[0156] The optical imaging system 300 includes a prism P as a means for folding the optical path of light in the optical imaging system 300. The prism P folds the first optical axis C1 to form a second optical axis C2. The second optical axis C2 is substantially perpendicular to the first optical axis C1. The prism P is disposed on the object side of the first lens 310 and reflects light reflected from the object to the image sensor 380.

[0157] A filter 370 is positioned in front of the image sensor 380 and blocks infrared light included in the incident light. The image sensor 380 includes multiple optical sensors and is configured to convert optical signals into electrical signals.

[0158] Table 5 below shows the optical characteristics of the components of the optical imaging system 300, and Table 6 below shows the aspherical surface coefficients of the lenses of the optical imaging system 300.

[0159] Table 5

[0160]

[0161] Table 6

[0162] Face number k A B C D E F G H J 4 -1.2E+00 -6.6E-05 4.5E-05 -8.4E-06 1.3E-06 -1.3E-07 7.7E-09 -2.6E-10 4.5E-12 -3.2E-14 5 0.0E+00 1.1E-03 -5.8E-04 1.6E-04 -2.3E-05 2.0E-06 -1.1E-07 3.6E-09 -6.7E-11 5.3E-13 6 0.0E+00 -5.3E-03 6.6E-04 -3.1E-05 -1.2E-05 2.8E-06 -2.7E-07 1.4E-08 -3.7E-10 4.1E-12 7 0.0E+00 -7.8E-03 -2.3E-03 1.7E-03 -5.1E-04 8.4E-05 -8.2E-06 4.7E-07 -1.5E-08 2.0E-10 8 0.0E+00 -3.6E-04 -7.6E-03 3.9E-03 -1.0E-03 1.5E-04 -1.4E-05 8.3E-07 -2.6E-08 3.6E-10 9 0.0E+00 1.3E-03 -9.1E-03 4.7E-03 -1.3E-03 2.0E-04 -2.0E-05 1.2E-06 -4.2E-08 6.1E-10 10 0.0E+00 2.4E-03 3.1E-03 -2.0E-03 6.6E-04 -1.2E-04 1.3E-05 -7.9E-07 2.7E-08 -3.8E-10 11 0.0E+00 -1.3E-02 1.4E-02 -6.7E-03 1.9E-03 -3.3E-04 3.6E-05 -2.4E-06 8.7E-08 -1.3E-09 12 0.0E+00 1.3E-02 -8.1E-03 4.0E-03 -1.1E-03 1.6E-04 -1.3E-05 6.5E-07 -1.5E-08 1.3E-10 13 0.0E+00 2.2E-02 -1.3E-02 5.8E-03 -1.6E-03 2.5E-04 -2.5E-05 1.5E-06 -5.2E-08 7.6E-10

[0163] Figure 7 This is a configuration diagram of the fourth example of an optical imaging system, and Figure 8 It shows Figure 7 The aberration curves of the optical imaging system are shown.

[0164] The optical imaging system 400 includes a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, and a fifth lens 450.

[0165] The first lens 410 has positive refractive power. The first lens 410 has a convex object-side surface and a convex image-side surface. The second lens 420 has negative refractive power. The second lens 420 has a concave object-side surface and a convex image-side surface. The third lens 430 has positive refractive power. The third lens 430 has a convex object-side surface and a convex image-side surface. The fourth lens 440 has negative refractive power. The fourth lens 440 has a concave object-side surface and a convex image-side surface. The fifth lens 450 has negative refractive power. The fifth lens 450 has a concave object-side surface and a convex image-side surface.

[0166] The optical imaging system 400 includes a prism P, a filter 470, and an image sensor 480.

[0167] The optical imaging system 400 includes a prism P as a means for folding the optical path of light in the optical imaging system 400. The prism P folds a first optical axis C1 to form a second optical axis C2. The second optical axis C2 is substantially perpendicular to the first optical axis C1. The prism P is disposed on the object side of the first lens 410 and reflects light reflected from the object to the image sensor 480.

[0168] A filter 470 is positioned in front of the image sensor 480 and blocks infrared light included in the incident light. The image sensor 480 includes multiple optical sensors and is configured to convert optical signals into electrical signals.

[0169] Table 7 below shows the optical characteristics of the components of the optical imaging system 400, and Table 8 below shows the aspherical surface coefficients of the lenses of the optical imaging system 400.

[0170] Table 7

[0171]

[0172]

[0173] Table 8

[0174] Face number k A B C D E F G H J 4 -1.2E+00 -6.6E-05 4.5E-05 -8.4E-06 1.3E-06 -1.3E-07 7.7E-09 -2.6E-10 4.5E-12 -3.2E-14 5 0.0E+00 1.1E-03 -5.8E-04 1.6E-04 -2.3E-05 2.0E-06 -1.1E-07 3.6E-09 -6.7E-11 5.3E-13 6 0.0E+00 -5.3E-03 6.6E-04 -3.1E-05 -1.2E-05 2.8E-06 -2.7E-07 1.4E-08 -3.7E-10 4.1E-12 7 0.0E+00 -7.8E-03 -2.3E-03 1.7E-03 -5.1E-04 8.4E-05 -8.2E-06 4.7E-07 -1.5E-08 2.0E-10 8 0.0E+00 -3.6E-04 -7.6E-03 3.9E-03 -1.0E-03 1.5E-04 -1.4E-05 8.3E-07 -2.6E-08 3.6E-10 9 0.0E+00 1.3E-03 -9.1E-03 4.7E-03 -1.3E-03 2.0E-04 -2.0E-05 1.2E-06 -4.2E-08 6.1E-10 10 0.0E+00 2.4E-03 3.1E-03 -2.0E-03 6.6E-04 -1.2E-04 1.3E-05 -7.9E-07 2.7E-08 -3.8E-10 11 0.0E+00 -1.3E-02 1.4E-02 -6.7E-03 1.9E-03 -3.3E-04 3.6E-05 -2.4E-06 8.7E-08 -1.3E-09 12 0.0E+00 1.3E-02 -8.1E-03 4.0E-03 -1.1E-03 1.6E-04 -1.3E-05 6.5E-07 -1.5E-08 1.3E-10 13 0.0E+00 2.2E-02 -1.3E-02 5.8E-03 -1.6E-03 2.5E-04 -2.5E-05 1.5E-06 -5.2E-08 7.6E-10

[0175] Figure 9 This is a configuration diagram of the fifth example of an optical imaging system, and Figure 10 It shows Figure 9 The aberration curves of the optical imaging system are shown.

[0176] The optical imaging system 500 includes a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, and a fifth lens 550.

[0177] The first lens 510 has positive refractive power. The first lens 510 has a convex object-side surface and a convex image-side surface. The second lens 520 has negative refractive power. The second lens 520 has a concave object-side surface and a convex image-side surface. The third lens 530 has positive refractive power. The third lens 530 has a convex object-side surface and a convex image-side surface. The fourth lens 540 has negative refractive power. The fourth lens 540 has a concave object-side surface and a convex image-side surface. The fifth lens 550 has positive refractive power. The fifth lens 550 has a concave object-side surface and a convex image-side surface.

[0178] The optical imaging system 500 also includes a prism P, a filter 570, and an image sensor 580.

[0179] The optical imaging system 500 includes a prism P as a means for folding the optical path of light in the optical imaging system 500. The prism P folds a first optical axis C1 to form a second optical axis C2. The second optical axis C2 is substantially perpendicular to the first optical axis C1. The prism P is disposed on the object side of the first lens 510 and reflects light reflected from the object to the image sensor 580.

[0180] A filter 570 is positioned in front of the image sensor 580 and blocks infrared light included in the incident light. The image sensor 580 includes multiple optical sensors and is configured to convert optical signals into electrical signals.

[0181] Table 9 below shows the optical characteristics of the components of the optical imaging system 500, and Table 10 below shows the aspherical surface coefficients of the lenses of the optical imaging system 500.

[0182] Table 9

[0183]

[0184] Table 10

[0185]

[0186]

[0187] Figure 11 This is a configuration diagram of the sixth example of an optical imaging system, and Figure 12 It shows Figure 11 The aberration curves of the optical imaging system are shown.

[0188] The optical imaging system 600 includes a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, and a fifth lens 650.

[0189] The first lens 610 has positive refractive power. The first lens 610 has a convex object-side surface and a convex image-side surface. The second lens 620 has negative refractive power. The second lens 620 has a convex object-side surface and a concave image-side surface. The third lens 630 has positive refractive power. The third lens 630 has a convex object-side surface and a convex image-side surface. The fourth lens 640 has negative refractive power. The fourth lens 640 has a concave object-side surface and a convex image-side surface. The fifth lens 650 has positive refractive power. The fifth lens 650 has a concave object-side surface and a convex image-side surface.

[0190] The optical imaging system 600 also includes a prism P, a filter 670, and an image sensor 680.

[0191] The optical imaging system 600 includes a prism P as a means for folding the optical path of light in the optical imaging system 600. The prism P folds a first optical axis C1 to form a second optical axis C2. The second optical axis C2 is substantially perpendicular to the first optical axis C1. The prism P is disposed on the object side of the first lens 610 and reflects light reflected from the object to the image sensor 680.

[0192] A filter 670 is positioned in front of the image sensor 680 and blocks infrared light included in the incident light. The image sensor 680 includes multiple optical sensors and is configured to convert optical signals into electrical signals.

[0193] Table 11 below shows the optical characteristics of the components of the optical imaging system 600, and Table 12 below shows the aspherical surface coefficients of the lenses of the optical imaging system 600.

[0194] Table 11

[0195]

[0196]

[0197] Table 12

[0198] Face number k A B C D E F G H J 4 -1.2E+00 -6.6E-05 4.5E-05 -8.4E-06 1.3E-06 -1.3E-07 7.7E-09 -2.6E-10 4.5E-12 -3.2E-14 5 0.0E+00 1.1E-03 -5.8E-04 1.6E-04 -2.3E-05 2.0E-06 -1.1E-07 3.6E-09 -6.7E-11 5.3E-13 6 0.0E+00 -5.3E-03 6.6E-04 -3.1E-05 -1.2E-05 2.8E-06 -2.7E-07 1.4E-08 -3.7E-10 4.1E-12 7 0.0E+00 -7.8E-03 -2.3E-03 1.7E-03 -5.1E-04 8.4E-05 -8.2E-06 4.7E-07 -1.5E-08 2.0E-10 8 0.0E+00 -3.6E-04 -7.6E-03 3.9E-03 -1.0E-03 1.5E-04 -1.4E-05 8.3E-07 -2.6E-08 3.6E-10 9 0.0E+00 1.3E-03 -9.1E-03 4.7E-03 -1.3E-03 2.0E-04 -2.0E-05 1.2E-06 -4.2E-08 6.1E-10 10 0.0E+00 2.4E-03 3.1E-03 -2.0E-03 6.6E-04 -1.2E-04 1.3E-05 -7.9E-07 2.7E-08 -3.8E-10 11 0.0E+00 -1.3E-02 1.4E-02 -6.7E-03 1.9E-03 -3.3E-04 3.6E-05 -2.4E-06 8.7E-08 -1.3E-09 12 0.0E+00 1.3E-02 -8.1E-03 4.0E-03 -1.1E-03 1.6E-04 -1.3E-05 6.5E-07 -1.5E-08 1.3E-10 13 0.0E+00 2.2E-02 -1.3E-02 5.8E-03 -1.6E-03 2.5E-04 -2.5E-05 1.5E-06 -5.2E-08 7.6E-10

[0199] Figure 13 This is a configuration diagram of the seventh example of an optical imaging system, and Figure 14 It shows Figure 13 The aberration curves of the optical imaging system are shown.

[0200] The optical imaging system 700 includes a first lens 710, a second lens 720, a third lens 730, a fourth lens 740, and a fifth lens 750.

[0201] The first lens 710 has positive refractive power. The first lens 710 has a convex object-side surface and a convex image-side surface. The second lens 720 has negative refractive power. The second lens 720 has a convex object-side surface and a concave image-side surface. The third lens 730 has positive refractive power. The third lens 730 has a convex object-side surface and a convex image-side surface. The fourth lens 740 has negative refractive power. The fourth lens 740 has a concave object-side surface and a convex image-side surface. The fifth lens 750 has negative refractive power. The fifth lens 750 has a concave object-side surface and a convex image-side surface.

[0202] The optical imaging system 700 includes a prism P, a filter 770, and an image sensor 780.

[0203] The optical imaging system 700 includes a prism P as a means for folding the optical path of light in the optical imaging system 700. The prism P folds a first optical axis C1 to form a second optical axis C2. The second optical axis C2 is substantially perpendicular to the first optical axis C1. The prism P is disposed on the object side of the first lens 710 and reflects light reflected from the object to the image sensor 780.

[0204] A filter 770 is positioned in front of the image sensor 780 and blocks infrared light included in the incident light. The image sensor 780 includes multiple optical sensors and is configured to convert optical signals into electrical signals.

[0205] Table 13 below shows the optical characteristics of the components of the optical imaging system 700, and Table 14 below shows the aspherical surface coefficients of the lenses of the optical imaging system 700.

[0206] Table 13

[0207]

[0208] Table 14

[0209]

[0210]

[0211] Figure 15 This is a configuration diagram of the eighth example of an optical imaging system, and Figure 16 It shows Figure 15 The aberration curves of the optical imaging system are shown.

[0212] The optical imaging system 800 includes a first lens 810, a second lens 820, a third lens 830, a fourth lens 840, and a fifth lens 850.

[0213] The first lens 810 has positive refractive power. The first lens 810 has a convex object-side surface and a convex image-side surface. The second lens 820 has negative refractive power. The second lens 820 has a concave object-side surface and a convex image-side surface. The third lens 830 has positive refractive power. The third lens 830 has a convex object-side surface and a convex image-side surface. The fourth lens 840 has negative refractive power. The fourth lens 840 has a concave object-side surface and a convex image-side surface. The fifth lens 850 has negative refractive power. The fifth lens 850 has a concave object-side surface and a convex image-side surface.

[0214] The optical imaging system 800 also includes a prism P, a filter 870, and an image sensor 880.

[0215] The optical imaging system 800 includes a prism P as a means for folding the optical path of light in the optical imaging system 800. The prism P folds a first optical axis C1 to form a second optical axis C2. The second optical axis C2 is substantially perpendicular to the first optical axis C1. The prism P is disposed on the object side of the first lens 810 and reflects light reflected from the object to the image sensor 880.

[0216] A filter 870 is positioned in front of the image sensor 880 and blocks infrared light included in the incident light. The image sensor 880 includes multiple optical sensors and is configured to convert optical signals into electrical signals.

[0217] Table 15 below shows the optical characteristics of the components of the optical imaging system 800, and Table 16 below shows the aspherical surface coefficients of the lenses of the optical imaging system 800.

[0218] Table 15

[0219]

[0220]

[0221] Table 16

[0222] Face number k A B C D E F G H J 4 -1.2E+00 -6.6E-05 4.5E-05 -8.4E-06 1.3E-06 -1.3E-07 7.7E-09 -2.6E-10 4.5E-12 -3.2E-14 5 0.0E+00 1.1E-03 -5.8E-04 1.6E-04 -2.3E-05 2.0E-06 -1.1E-07 3.6E-09 -6.7E-11 5.3E-13 6 0.0E+00 -5.3E-03 6.6E-04 -3.1E-05 -1.2E-05 2.8E-06 -2.7E-07 1.4E-08 -3.7E-10 4.1E-12 7 0.0E+00 -7.8E-03 -2.3E-03 1.7E-03 -5.1E-04 8.4E-05 -8.2E-06 4.7E-07 -1.5E-08 2.0E-10 8 0.0E+00 -3.6E-04 -7.6E-03 3.9E-03 -1.0E-03 1.5E-04 -1.4E-05 8.3E-07 -2.6E-08 3.6E-10 9 0.0E+00 1.3E-03 -9.1E-03 4.7E-03 -1.3E-03 2.0E-04 -2.0E-05 1.2E-06 -4.2E-08 6.1E-10 10 0.0E+00 2.4E-03 3.1E-03 -2.0E-03 6.6E-04 -1.2E-04 1.3E-05 -7.9E-07 2.7E-08 -3.8E-10 11 0.0E+00 -1.3E-02 1.4E-02 -6.7E-03 1.9E-03 -3.3E-04 3.6E-05 -2.4E-06 8.7E-08 -1.3E-09 12 0.0E+00 1.3E-02 -8.1E-03 4.0E-03 -1.1E-03 1.6E-04 -1.3E-05 6.5E-07 -1.5E-08 1.3E-10 13 0.0E+00 2.2E-02 -1.3E-02 5.8E-03 -1.6E-03 2.5E-04 -2.5E-05 1.5E-06 -5.2E-08 7.6E-10

[0223] Figure 17 This is a configuration diagram of the ninth example of an optical imaging system, and Figure 18 It shows Figure 17 The aberration curves of the optical imaging system are shown.

[0224] The optical imaging system 900 includes a first lens 910, a second lens 920, a third lens 930, a fourth lens 940, a fifth lens 950, and a sixth lens 960.

[0225] The first lens 910 has positive refractive power. The first lens 910 has a convex object-side surface and a concave image-side surface. The second lens 920 has positive refractive power. The second lens 920 has a convex object-side surface and a convex image-side surface. The third lens 930 has negative refractive power. The third lens 930 has a concave object-side surface and a convex image-side surface. The fourth lens 940 has positive refractive power. The fourth lens 940 has a convex object-side surface and a convex image-side surface. The fifth lens 950 has negative refractive power. The fifth lens 950 has a concave object-side surface and a convex image-side surface. The sixth lens 960 has positive refractive power. The sixth lens 960 has a concave object-side surface and a convex image-side surface.

[0226] The optical imaging system 900 includes a prism P, a filter 970, and an image sensor 980.

[0227] The optical imaging system 900 includes a prism P as a means for folding the optical path of light in the optical imaging system 900. The prism P folds a first optical axis C1 to form a second optical axis C2. The second optical axis C2 is substantially perpendicular to the first optical axis C1. The prism P is disposed on the object side of the first lens 910 and reflects light reflected from the object to the image sensor 980.

[0228] A filter 970 is positioned in front of the image sensor 980 and blocks infrared light included in the incident light. The image sensor 980 includes multiple optical sensors and is configured to convert optical signals into electrical signals.

[0229] Table 17 below shows the optical characteristics of the components of the optical imaging system 900, and Table 18 below shows the aspherical surface coefficients of the lenses of the optical imaging system 900.

[0230] Table 17

[0231]

[0232]

[0233] Table 18

[0234] Face number k A B C D E F G H J 4 -8.9E-01 1.5E-04 7.2E-05 -1.7E-05 2.6E-06 -2.5E-07 1.5E-08 -5.5E-10 1.1E-11 -9.7E-14 5 0.0E+00 -2.4E-05 2.6E-05 -1.4E-05 3.8E-06 -5.6E-07 4.7E-08 -2.2E-09 5.5E-11 -5.4E-13 6 0.0E+00 -2.5E-05 -1.8E-07 6.0E-06 -2.0E-06 3.1E-07 -2.7E-08 1.3E-09 -3.7E-11 4.4E-13 7 0.0E+00 -4.1E-03 2.5E-03 -6.1E-04 8.4E-05 -6.7E-06 3.0E-07 -5.5E-09 -4.2E-11 2.3E-12 8 0.0E+00 7.8E-03 1.0E-03 -2.3E-04 -3.9E-05 1.8E-05 -2.6E-06 1.8E-07 -6.7E-09 1.0E-10 9 0.0E+00 1.2E-02 -5.9E-03 2.2E-03 -4.8E-04 5.8E-05 -3.4E-06 2.9E-08 5.7E-09 -1.9E-10 10 0.0E+00 6.0E-04 -3.7E-03 1.2E-03 -1.4E-04 -1.1E-05 4.8E-06 -5.2E-07 2.6E-08 -5.1E-10 11 0.0E+00 -9.5E-03 1.7E-03 -3.0E-04 9.1E-05 -2.3E-05 3.3E-06 -2.5E-07 9.4E-09 -1.4E-10 12 0.0E+00 -7.5E-03 6.0E-03 -1.8E-03 3.8E-04 -5.7E-05 5.9E-06 -3.9E-07 1.5E-08 -2.3E-10 13 0.0E+00 1.8E-03 -7.2E-04 5.7E-04 -2.3E-04 4.7E-05 -5.4E-06 3.6E-07 -1.3E-08 1.9E-10 14 0.0E+00 4.2E-03 -3.3E-03 1.9E-03 -5.2E-04 8.2E-05 -7.8E-06 4.4E-07 -1.4E-08 1.9E-10 15 0.0E+00 2.8E-03 4.2E-04 4.5E-05 1.8E-05 -1.4E-05 2.7E-06 -2.5E-07 1.1E-08 -2.0E-10

[0235] Figure 19 This is a configuration diagram of the tenth example of an optical imaging system, and Figure 20 It shows Figure 19 The aberration curves of the optical imaging system are shown.

[0236] The optical imaging system 1000 includes a first lens 1010, a second lens 1020, a third lens 1030, a fourth lens 1040, and a fifth lens 1050.

[0237] The first lens 1010 has positive refractive power. The first lens 1010 has a convex object-side surface and a convex image-side surface. The second lens 1020 has negative refractive power. The second lens 1020 has a concave object-side surface and a concave image-side surface. The third lens 1030 has negative refractive power. The third lens 1030 has a convex object-side surface and a concave image-side surface. The fourth lens 1040 has positive refractive power. The fourth lens 1040 has a concave object-side surface and a convex image-side surface. The fifth lens 1050 has negative refractive power. The fifth lens 1050 has a concave object-side surface and a convex image-side surface.

[0238] The optical imaging system 1000 also includes a first prism P1, a filter 1070, a second prism P2, and an image sensor 1080.

[0239] The optical imaging system 1000 includes a first prism P1 as a means for folding the optical path of light in the optical imaging system 1000. The first prism P1 folds a first optical axis C1 to form a second optical axis C2. The second optical axis C2 is substantially perpendicular to the first optical axis C1. The first prism P1 is disposed on the object side of the first lens 1010 and reflects light reflected from the object to the second prism P2.

[0240] The optical imaging system 1000 includes a second prism P2 as another device for folding the optical path of light in the optical imaging system 1000. The second prism P2 folds the second optical axis C2 to form a third optical axis C3. The third optical axis C3 is substantially perpendicular to the second optical axis C2. The second prism P2 is disposed between the fifth lens 1050 and the image sensor 1080, and reflects the light reflected by the first prism P1 to the image sensor 1080.

[0241] A filter 1070 is disposed in front of the image sensor 1080 and blocks infrared radiation included in the incident light. The image sensor 1080 includes multiple optical sensors and is configured to convert optical signals into electrical signals.

[0242] Table 19 below shows the optical characteristics of the components of the optical imaging system 1000, and Table 20 below shows the aspherical surface coefficients of the optical imaging system 1000.

[0243] Table 19

[0244]

[0245]

[0246] Table 20

[0247]

[0248] Figure 21This is a configuration diagram of the eleventh example of an optical imaging system, and Figure 22 It shows Figure 21 The aberration curves of the optical imaging system are shown.

[0249] The optical imaging system 1100 includes a first lens 1110, a second lens 1120, a third lens 1130, a fourth lens 1140, and a fifth lens 1150.

[0250] The first lens 1110 has positive refractive power. The first lens 1110 has a convex object-side surface and a convex image-side surface. The second lens 1120 has negative refractive power. The second lens 1120 has a convex object-side surface and a concave image-side surface. The third lens 1130 has negative refractive power. The third lens 1130 has a convex object-side surface and a concave image-side surface. The fourth lens 1140 has positive refractive power. The fourth lens 1140 has a concave object-side surface and a convex image-side surface. The fifth lens 1150 has negative refractive power. The fifth lens 1150 has a concave object-side surface and a convex image-side surface.

[0251] The optical imaging system 1100 also includes a first prism P1, a filter 1170, a second prism P2, and an image sensor 1180.

[0252] The optical imaging system 1100 includes a first prism P1 as a means for folding the optical path of light in the optical imaging system 1100. The first prism P1 folds a first optical axis C1 to form a second optical axis C2. The second optical axis C2 is substantially perpendicular to the first optical axis C1. The first prism P1 is disposed on the object side of the first lens 1110 and reflects light reflected from the object to the second prism P2.

[0253] The optical imaging system 1100 includes a second prism P2 as another device for folding the optical path of light in the optical imaging system 1100. The second prism P2 folds the second optical axis C2 to form a third optical axis C3. The third optical axis C3 is substantially perpendicular to the second optical axis C2. The second prism P2 is disposed between the fifth lens 1150 and the image sensor 1180, and reflects the light reflected by the first prism P1 to the image sensor 1180.

[0254] A filter 1170 is positioned in front of the image sensor 1180 and blocks infrared light included in the incident light. The image sensor 1180 includes multiple optical sensors and is configured to convert optical signals into electrical signals.

[0255] Table 21 below shows the optical characteristics of the components of the optical imaging system 1100, and Table 22 below shows the aspherical surface coefficients of the optical imaging system 1100.

[0256] Table 21

[0257]

[0258]

[0259] Table 22

[0260]

[0261] Table 23 below shows the optical characteristics of the first through eleventh examples of the optical imaging system. In Table 23, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens. F, BFL, TTL, and PTTL have been defined above.

[0262] Table 23

[0263]

[0264] Tables 24 and 25 below show the values ​​of conditional expressions 1 to 9 for the first to eleventh examples of the optical imaging system. As can be seen from Tables 24 and 25, except for the sixth example which does not satisfy conditional expression 7 (0.8 ≤ TTL / f ≤ 1.0) and the eleventh example which does not satisfy conditional expression 9 (0.2 ≤ L1R1 / f ≤ 0.3), the first to eleventh examples of the optical imaging system satisfy conditional expressions 1 and all conditional expressions 2 to 9. None of the first to eleventh examples satisfy conditional expression 2 (3.2). <Nd2+Nd3)。

[0265] Table 24

[0266]

[0267] Table 25

[0268] conditional expression Seventh Example Eighth Example Ninth Example Tenth example Eleventh Example f-number 3.2300 3.3500 3.1300 3.3500 3.2700 Nd2+Nd3 3.3001 3.3001 3.1572 3.2412 3.2990 f1+f2 2.6851 2.5450 31.9476 2.6300 0.7900 D12 / f 0.0106 0.0228 0.0052 0.0348 0.0175 L1R2eMax / IMG_HT 1.791 1.5913 1.6915 1.3524 1.7144 L1R2eMax / L1R1eMax 0.9283 0.9093 0.9426 0.8050 0.9978 TTL / f 0.9549 0.9549 1.3631 1.0692 0.9867 TTL / IMG_HT 11.400 11.454 15.3532 12.0432 11.1142 L1R1 / f 0.2208 0.2707 0.2714 0.2414 0.1947

[0269] Table 26 below shows other optical characteristics of the first through eleventh examples of the optical imaging systems.

[0270] Table 26

[0271] Example IMG_HT FOV 2θ AL1 First Example 2.619 9.92 24.167 88.140 Second example 2.619 10.00 27.713 86.767 Third Example 2.619 9.40 31.050 85.143 Fourth example 2.619 10.00 5.849 60.794 Fifth example 4 9.80 19.297 145.075 Sixth example 4 9.70 25.194 170.451 Seventh Example 4 9.50 24.208 181.312 Eighth Example 4 9.70 15.310 152.709 Ninth Example 2.619 10.10 45.573 56.343 Tenth example 2.619 10.10 9.650 60.699 Eleventh Example 2.619 10.10 25.264 61.391

[0272] Tables 27 and 28 below show the values ​​of conditional expressions 10 to 14, 16-23, and 25 for the first to eleventh examples of optical imaging systems.

[0273] Table 27

[0274]

[0275] Table 28

[0276]

[0277]

[0278] Figure 23 This is a plan view of an example of the first lens in an optical imaging system when viewed along the optical axis, and Figure 24 This is a plan view of an example of a spacing maintenance member disposed between a first lens and a second lens in an optical imaging system when viewed in the direction of the optical axis.

[0279] refer to Figure 23 When viewed along the optical axis, the first lens L1 has a non-circular shape and includes two arcuate side surfaces and two straight side surfaces that are parallel to each other and connect the two arcuate side surfaces to each other. Figure 23 The object-side surface of the first lens L1 is shown. The first lens L1 can be the first lens of any of the first to eleventh examples of the optical imaging system described above.

[0280] The first lens L1 includes an optical portion exhibiting the lens characteristics of the first lens L1 and a flange portion not exhibiting the lens characteristics of the first lens L1, and the flange portion extends from the optical portion in a direction away from the optical axis C2. The optical portion has two arcuate edges and two straight edges parallel to each other and connecting the two arcuate edges to each other. The flange portion includes a flange portion extending from one of the two arcuate edges of the optical portion and another flange portion extending from the other of the two arcuate edges of the optical portion.

[0281] The optical portion of the object-side surface of the first lens L1 has different lengths or effective radii in a first direction and a second direction. The first direction intersects the optical axis C2 and is parallel to the straight edge of the optical portion, while the second direction intersects the optical axis C2 and is perpendicular to the first direction. The effective radius L1S1el (hereinafter referred to as the major axis effective radius L1S1el) of the optical portion of the object-side surface of the first lens L1 in the first direction is greater than the effective radius L1S1es (hereinafter referred to as the minor axis effective radius L1S1es) of the optical portion of the object-side surface of the first lens L1 in the second direction. The major axis effective radius L1S1el is measured from the optical axis C2 to one of the arcuate edges of the optical portion, and the minor axis effective radius L1S1es is measured from the optical axis C2 to one of the straight edges of the optical portion. In any of the first to eleventh examples of the optical imaging system described above, the minor axis effective radius L1S1es is parallel to the first optical axis C1.

[0282] The major axis effective radius L1S1el is the maximum effective radius L1R1eMax of the optical portion on the object side of the first lens L1, and the minor axis effective radius L1S1es is the minimum effective radius of the optical portion on the object side of the first lens L1.

[0283] The straight edges of the optical portion can be limited to a predetermined size. For example, the angle 2θ can have a value in the range of 10° to 92°, and the angle 2θ has a vertex at the optical axis C2 of the first lens L1 and corresponds to one of the straight edges of the optical portion.

[0284] The area of ​​the object side of the optical portion of the first lens L1 projected onto a plane perpendicular to the optical axis is AL1.

[0285] although Figure 23 As not shown in the diagram, the image-side surface of the optical portion of the first lens L1 has a major axis effective radius L1S2el and a minor axis effective radius L1S2es. The major axis effective radius L1S2el is the maximum effective radius L1R2eMax of the optical portion of the image-side surface of the first lens L1, and the minor axis effective radius L1S2es is the minimum effective radius of the optical portion of the image-side surface of the first lens L1. The major axis effective radius L1S2el is parallel to the major axis effective radius L1S1el of the optical portion of the object-side surface of the first lens L1, and the minor axis effective radius L1S2es is parallel to the minor axis effective radius L1S1es of the optical portion of the object-side surface of the first lens L1.

[0286] Despite Figure 23 Only the first lens L1 is shown, but one or more of the second to fifth lenses or the second to sixth lenses may have a non-circular shape that is the same as or similar to the non-circular shape of the first lens L1. For example, only the second lens may have a non-circular shape, and the third to fifth lenses or the third to sixth lenses may have a circular shape. Alternatively, all of the second to fifth lenses or the second to sixth lenses may have a non-circular shape. The second to fifth lenses may be the second to fifth lenses of any one of the first to eighth, tenth, and eleventh examples of the optical imaging system described above. Alternatively, the second to sixth lenses may be the second to sixth lenses of the ninth example of the optical imaging system described above.

[0287] When the second lens has a non-circular shape that is the same as or similar to that of the first lens L1, the object-side surface of the optical portion of the second lens has a major axis effective radius L2S1el and a minor axis effective radius L2S1es. The major axis effective radius L2S1el is the maximum effective radius of the optical portion of the object-side surface of the second lens, and the minor axis effective radius L2S1es is the minimum effective radius of the optical portion of the object-side surface of the second lens. The major axis effective radius L2S1el is parallel to the major axis effective radius L1S1el of the optical portion of the object-side surface of the first lens L1, and the minor axis effective radius L2S1es is parallel to the minor axis effective radius L1S1es of the optical portion of the object-side surface of the first lens L1.

[0288] Furthermore, the image-side surface of the optical portion of the second lens has a major axis effective radius L2S2el and a minor axis effective radius L2S2es. The major axis effective radius L2S2el is the maximum effective radius of the optical portion of the image-side surface of the second lens, and the minor axis effective radius L2S2es is the minimum effective radius of the optical portion of the image-side surface of the second lens. The major axis effective radius L2S2el is parallel to the major axis effective radius L1S1el of the optical portion of the object-side surface of the first lens L1, and the minor axis effective radius L2S2es is parallel to the minor axis effective radius L1S1es of the optical portion of the object-side surface of the first lens L1.

[0289] refer to Figure 24 The interval maintenance component SP is set in Figure 23 The first lens L1 and the second lens (not shown) are positioned to maintain a distance between them, and the spacing maintaining member SP has a non-circular shape when viewed along the optical axis. Figure 24 In the example shown, the spacer maintaining member SP has a generally rectangular shape and includes two curved outer surfaces and two straight outer surfaces connecting the two curved outer surfaces to each other. The two straight outer surfaces may be parallel to each other. However, this is just an example, and the spacer maintaining member SP may have different non-circular shapes.

[0290] The length SPX1 of the spacing maintenance member SP in the first direction is greater than the length SPY1 of the spacing maintenance member SP in the second direction perpendicular to the first direction. The length SPX1 of the spacing maintenance member SP is parallel to the effective radius L1S1el of the major axis of the optical portion on the object side of the first lens L1, and the length SPY1 of the spacing maintenance member SP is parallel to the effective radius L1S1es of the minor axis of the optical portion on the object side of the first lens L1.

[0291] A hole is formed in the spacer member SP. The hole has a shape including a major axis and a minor axis. For example, the hole can be elliptical, rectangular with rounded corners, or any other shape with a major axis and a minor axis. The shape and size of the hole can be... Figure 23 The optical portions of the first lens L1 are approximately the same or similar in shape and size. The aperture includes two arc-shaped sides and two straight sides connecting the two arc-shaped sides to each other. The two straight sides may be parallel to each other.

[0292] The length SPX2 of the aperture in the first direction is greater than the length SPY2 of the aperture in the second direction. The length SPX2 of the aperture is parallel to both the length SPX1 of the spacer maintaining member SP and the effective radius L1S1el of the major axis of the optical portion on the object side of the first lens L1, and the length SPY2 of the aperture is parallel to both the length SPY1 of the spacer maintaining member SP and the effective radius L1S1es of the minor axis of the optical portion on the object side of the first lens L1.

[0293] Figures 25 to 28 This is a rear view of an example of a portable electronic device equipped with multiple optical imaging systems.

[0294] refer to Figures 25 to 28 The portable electronic device 10 is equipped with a rear-facing telephoto optical imaging system 20 with a long focal length. The telephoto optical imaging system 20 can be any one of the optical imaging systems 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, and 1100 described in this application, and includes... Figure 23 The first lens L1 and Figure 24 The interval maintenance component SP in the middle.

[0295] refer to Figure 25 In addition to the telephoto optical imaging system 20, the portable electronic device 10 may also be equipped with a rearward first wide-angle optical imaging system 30, which has a first short focal length shorter than the telephoto focal length of the telephoto optical imaging system 20. Furthermore, the first wide-angle optical imaging system 30 has a wider field of view than the telephoto optical imaging system 20.

[0296] refer to Figure 26 In addition to the telephoto optical imaging system 20 and the first wide-angle optical imaging system 30, the portable electronic device 10 may also be equipped with a rearward second wide-angle optical imaging system 40. The second wide-angle optical imaging system 40 has a second short focal length that is shorter than the telephoto focal length of the telephoto optical imaging system 20 and different from the first short focal length of the first wide-angle optical imaging system 30. For example, the second wide-angle optical imaging system 40 may have a second short focal length that is shorter than the telephoto focal length of the telephoto optical imaging system 20 and longer than the first short focal length of the first wide-angle optical imaging system 30. For example, the second wide-angle optical imaging system 40 may have a wider field of view than the telephoto optical imaging system 20 and narrower than the first wide-angle optical imaging system 30.

[0297] refer to Figure 27In addition to the telephoto optical imaging system 20, the first wide-angle optical imaging system 30, and the second wide-angle optical imaging system 40, the portable electronic device 10 may also be equipped with a rearward third wide-angle optical imaging system 50. The third wide-angle optical imaging system 50 has a third short focal length that is shorter than the telephoto optical imaging system 20, different from the first short focal length of the first wide-angle optical imaging system 30, and different from the second short focal length of the second wide-angle optical imaging system 40.

[0298] refer to Figure 28 The telephoto optical imaging system 20, the first wide-angle optical imaging system 30, and the second wide-angle optical imaging system 40 are positioned differently from their respective locations in [the context of the previous sentence]. Figure 26 The setting location in [the context].

[0299] Apart from Figures 25 to 28 The portable electronic device 10 may also be equipped with a forward optical imaging system (not shown), and rearward optical imaging systems 20, 30, 40 and 50.

[0300] The above example describes how to implement an optical imaging system with a long focal length (i.e., a long focal length optical imaging system) that can be installed in a portable electronic device.

[0301] 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. Descriptions 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, second lens, third lens, fourth lens, and fifth lens are arranged sequentially from the object side to the imaging plane. The first lens has positive refractive power and a convex object-side surface and a convex image-side surface; the second lens has negative refractive power; the third lens has positive refractive power and a convex object-side surface and a convex image-side surface; and the fourth lens has negative refractive power and a concave object-side surface and a convex image-side surface. Wherein, the ratio of the effective radius of the minor axis L1S2es of the image-side surface of the first lens to the effective radius of the major axis L1S2el of the image-side surface of the first lens, L1S2es / L1S2el, is greater than 0.8 and less than 1.

0. The following condition must be met: 0.79mm ≤ f1 + f2 < 32mm, where f1 is the focal length of the first lens and f2 is the focal length of the second lens. The focal length of the first lens is in the range of 7.0 mm to 18.0 mm. The optical imaging system has a total of five lenses, and The optical imaging system further includes a first prism disposed on the object side of the first lens.

2. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: 0≤D12 / f≤0.05 Wherein, D12 is the distance from the image side of the first lens to the object side of the second lens, and f is the focal length of the optical imaging system.

3. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: 0.5 <L1S2eMax / IMG_HT <2.20 Wherein, L1S2eMax is the maximum effective radius of the image-side surface of the first lens, and IMG_HT is half the diagonal length of the imaging surface.

4. The optical imaging system according to claim 1, wherein, The ratio of the distance TTL from the object side of the first lens to the imaging surface to half the diagonal length of the imaging surface, IMG_HT, is 11 or greater.

5. The optical imaging system according to claim 1, wherein, The following conditional expression is satisfied: 2 < BFL / 2IMG_HT < 5 Wherein, BFL is the distance along the optical axis from the image side of the fifth lens to the imaging surface, and 2IMG_HT is the diagonal length of the imaging surface.

6. The optical imaging system according to claim 5, wherein, The following conditional expression is satisfied: 0.07 <L1S1es / PTTL <0.12 Wherein, L1S1es is the effective radius of the minor axis of the object side of the first lens, and PTTL is the distance from the reflecting surface of the first prism to the imaging surface.

Images