Lens and optical image capturing system

Abstract

The present disclosure relates to a lens and an optical imaging system in which a first profile in a first direction intersecting an optical axis and a second profile in a second direction intersecting the optical axis are different from each other, and a length of the first profile in the first direction is different from a length of the second profile in the second direction.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2020-0184433, filed on December 28, 2020, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. Technical Field

[0003] This disclosure relates to a lens configured to improve resolution degradation and an optical imaging system including the lens. Background Technology

[0004] Portable electronic devices often include camera modules. For example, portable electronic devices such as smartphones and laptops include camera modules. The optical imaging system of the camera module may include multiple lenses to improve the resolution of the camera module. For example, the optical imaging system may include three or more lenses. The optical imaging system may include lenses that enable thinner or smaller camera modules. For example, the optical imaging system includes lenses in which the X and Y directions are asymmetrical. However, due to the asymmetrical shape, the aforementioned lenses may have optical characteristics in the X direction and optical characteristics in the Y direction that differ from the initial design values.

[0005] The above information is presented as background information only to aid in understanding this disclosure. No determination or assertion is made as to whether any of the above content can be used as prior art relating to this disclosure. Summary of the Invention

[0006] 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 is it intended to help determine the scope of the claimed subject matter.

[0007] In one general aspect, a lens wherein a first profile in a first direction intersecting the optical axis and a second profile in a second direction intersecting the optical axis are different from each other, and the length of the first profile in the first direction is different from the length of the second profile in the second direction.

[0008] The radius of curvature Rx1 of the object side of the first profile and the radius of curvature Ry1 of the object side of the second profile can be different from each other.

[0009] |(Rx1-Ry1) / Ry1| can be greater than 0 and less than 0.5.

[0010] |(Rx1-Ry1) / Rx2| can be greater than 0.2 and less than 2.0, where Rx2 is the radius of curvature of the image side of the first profile.

[0011] |fx-fy| can be greater than 0 and less than 0.5 mm, where fx is the focal length of the lens calculated based on the radius of curvature of the first profile, and fy is the focal length of the lens calculated based on the radius of curvature of the second profile.

[0012] |(fx-fy) / fx| can be greater than 0 and less than 0.01.

[0013] In another general aspect, an optical imaging system includes three or more lenses disposed on an optical axis, wherein one or more of the three or more lenses include one or more deformable lenses, each deformable lens having a first profile in a first direction intersecting the optical axis and a second profile in a second direction intersecting the optical axis, the first profile and the second profile being different from each other, and the length of the first profile in the first direction being different from the length of the second profile in the second direction.

[0014] The three or more lenses may include a first lens, a second lens, and a third lens arranged sequentially from the object side, and the third lens may be an anamorphic lens among the one or more anamorphic lenses. Alternatively, the three or more lenses may include a first lens, a second lens, a third lens, and a fourth lens arranged sequentially from the object side, and the second and fourth lenses may be anamorphic lenses among the one or more anamorphic lenses. Alternatively, the three or more lenses may include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially from the object side, and the fourth lens or the second and fourth lenses may be anamorphic lenses among the one or more anamorphic lenses.

[0015] When the second lens and the fourth lens can be deformable lenses, the second lens has a shape in which the radius of curvature of the object side in the first direction is greater than the radius of curvature of the object side in the second direction, and the fourth lens has a shape in which the radius of curvature of the object side in the first direction is smaller than the radius of curvature of the object side in the second direction.

[0016] The first lens can have positive refractive power, the second lens can have negative refractive power, and the third lens can have positive refractive power.

[0017] In another general aspect, an optical imaging system includes a deformable lens comprising: a radius of curvature Rx1 of an object-side surface including a first profile of an optical axis, and a radius of curvature Ry1 of an object-side surface including a second profile of an optical axis, wherein the radii of curvature Rx1 and Ry1 are different from each other, and wherein the lengths of the first profile and the second profile are different from each other.

[0018] The optical imaging system may also include a first lens, a second lens, and a third lens arranged sequentially from the object side, wherein the third lens has positive refractive power and may be a deformable lens.

[0019] The optical imaging system may also include a first lens, a second lens, a third lens, and a fourth lens arranged sequentially from the object side, wherein the second lens and the fourth lens may be anamorphic lenses.

[0020] The optical imaging system may also include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially from the object side, wherein the second lens and the fourth lens may be anamorphic lenses.

[0021] The optical imaging system may also include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially from the object side, wherein the fourth lens may be a deformable lens.

[0022] (R10-R11x) / (R10-R11y) can be greater than 0.6 and less than 1.2, where R10 is the radius of curvature of the image side of the third lens, R11x is the radius of curvature of the object side of the fourth lens according to the first profile, and R11y is the radius of curvature of the object side of the fourth lens according to the second profile.

[0023] |(fx-fy) / f| can be greater than 0 and less than 0.005, where fx is the focal length of the deformable lens calculated based on the radius of curvature of the first profile of the deformable lens, fy is the focal length of the deformable lens calculated based on the radius of curvature of the second profile of the deformable lens, and f is the focal length of the optical imaging system.

[0024] |(Rx1-Ry1) / Rx2| can be greater than 0 and less than 2.0, where Rx2 is the radius of curvature of the image-side surface of the first profile of the deformable lens.

[0025] Other features and aspects will become apparent from the following detailed description, the accompanying drawings, and the appended claims. Attached Figure Description

[0026] Figure 1 This is a plan view of a lens according to an exemplary embodiment.

[0027] Figure 2A yes Figure 1 An example of the first profile of the lens shown in the first direction, and Figure 2B yes Figure 1 An example of the second profile of a lens in the second direction is shown.

[0028] Figure 3This is a view illustrating an optical imaging system according to a first exemplary embodiment of the present disclosure.

[0029] Figure 4 It shows a representation Figure 3 The graph shows the aberration characteristics of the optical imaging system.

[0030] Figure 5 This is a view illustrating an optical imaging system according to a second exemplary embodiment of the present disclosure.

[0031] Figure 6 It shows a representation Figure 5 The graph shows the aberration characteristics of the optical imaging system.

[0032] Figure 7 This is a view illustrating an optical imaging system according to a third exemplary embodiment of the present disclosure.

[0033] Figure 8 It shows a representation Figure 7 The graph shows the aberration characteristics of the optical imaging system.

[0034] Figure 9 This is a view illustrating an optical imaging system according to a fourth exemplary embodiment of the present disclosure.

[0035] Figure 10 It shows a representation Figure 9 The graph shows the aberration characteristics of the optical imaging system.

[0036] Figure 11 This is a view illustrating an optical imaging system according to a fifth exemplary embodiment of the present disclosure.

[0037] Figure 12 It shows a representation Figure 11 The graph shows the aberration characteristics of the optical imaging system.

[0038] Figure 13 This is a view illustrating an optical imaging system according to a sixth exemplary embodiment of the present disclosure.

[0039] Figure 14 It shows a representation Figure 13 The graph shows the aberration characteristics of the optical imaging system.

[0040] 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

[0041] In the following description, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings; however, it should be noted that the examples are not limited thereto.

[0042] The following detailed embodiments are provided to help the reader gain a full understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding this disclosure. For example, the order of operations described herein is merely illustrative, except for operations that must occur in a specific order, and is not limited to the order set forth herein; changes may be made that will become apparent after understanding this disclosure. Furthermore, descriptions of functions and constructions well-known in the art may be omitted for clarity and conciseness.

[0043] The features described herein may be implemented in various forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein, which will be apparent upon understanding this disclosure.

[0044] In this document, it should be noted that the use of the word “may” (e.g., what an example or implementation may include or implement) with respect to examples or implementations means that there exists at least one example or implementation that includes or implements such a feature, but not all examples and implementations are limited thereto.

[0045] 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 are no other elements between the element and the other element. As used herein, a "part" of an element may include the entire element or a portion of the entire element less than the entire element.

[0046] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more items. Similarly, “at least one of…” includes any one of the associated listed items and any combination of any two or more items.

[0047] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited by these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or section from another. Therefore, without departing from the teachings of the examples, the first component, first part, first region, first layer, or first section mentioned in the examples described herein may also be referred to as a second component, second part, second region, second layer, or second section.

[0048] Spatial relative terms such as “above,” “above,” “below,” and “below” may be used herein 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 herein should be interpreted accordingly.

[0049] The terminology used herein is for the purpose of describing various examples only and is not intended to limit the scope of this disclosure. Unless the context clearly indicates otherwise, the articles “a,” “an,” and “the” are intended to include plural forms as well. The terms “comprising,” “including,” and “having” indicate the presence of 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.

[0050] The shapes shown in the accompanying drawings may vary due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include shape variations that occur during manufacturing.

[0051] The features of the examples described herein can be combined in various ways, as will be apparent upon understanding this disclosure. Furthermore, while the examples described herein have multiple configurations, other configurations are also possible, as will be apparent upon understanding this disclosure.

[0052] Furthermore, in this specification, the first lens refers to the lens closest to the object (or target). The radius of curvature and thickness of the lens, the distance (TTL) along the optical axis from the object-side surface of the first lens to the imaging plane, half the diagonal length of the imaging plane (IMG HT), and the focal length of the lens are all expressed in millimeters (mm). The thickness of the lens, the gap between lenses, and the TTL are distances along the optical axis of the lens. In the description of the lens shape, a convex surface of the lens means that the optical axis portion of the corresponding surface is convex, and a concave surface of the lens means that the optical axis portion of the corresponding surface is concave. Therefore, although a convex surface of the lens is described, the edge portion of the lens may be concave. Similarly, although a concave surface of the lens is described, the edge portion of the lens may be convex. In this specification, the imaging plane may refer to the image-forming surface on which the lens focuses or a surface of the image sensor.

[0053] One aspect of the present invention can provide a lens configured to significantly reduce resolution degradation due to asymmetric shape and an optical imaging system including the lens.

[0054] Reference Figure 1 , Figure 2A and Figure 2B A lens LM is described according to an exemplary embodiment of the present disclosure.

[0055] According to an exemplary embodiment, a lens LM can be configured such that a first profile LMs1 in a first direction intersecting the optical axis C and a second profile LMs2 in a second direction intersecting the optical axis are different from each other. For example, the radius of curvature Rx1 of the object-side surface of the first profile LMs1 and the radius of curvature Ry1 of the object-side surface of the second profile LMs2 can be different. However, the lens LM is not necessarily limited to having different radii of curvature. For example, the radius of curvature Rx2 of the image-side surface of the first profile LMs1 and the radius of curvature Ry2 of the image-side surface of the second profile LMs2 can be the same. According to an exemplary embodiment, a lens LM can be configured to be mounted in a narrow space. For example, the length Lx of the first profile LMs1 and the length Ly of the second profile LMs2 can be different. For reference, the lengths Lx and Ly of the profiles LMs1 and LMs2 refer to the dimensions in the direction intersecting the optical axis, such as... Figure 1 , Figure 2A and Figure 2B As shown.

[0056] The lens LM according to the exemplary embodiment can be formed of a plastic material. However, the material of the lens LM is not limited to plastic. The lens LM can be configured to facilitate mass production. For example, the lens LM can be manufactured by injection molding.

[0057] The lens LM according to the exemplary embodiment can satisfy one or more of the following conditional expressions: 0 < |(Rx1 - Ry1) / Ry1| < 0.5 0.2 < |(Rx1 - Ry1) / Rx2| < 2.0 0 < |fx - fy| < 0.5 mm 0 < |(fx - fy) / fx| < 0.01 In the above conditional expressions, Rx1 is the radius of curvature of the object-side surface of the first contour LMs1, Rx2 is the radius of curvature of the image-side surface of the first contour LMs1, Ry1 is the radius of curvature of the object-side surface of the second contour LMs2, fx is the focal length calculated based on the radius of curvature of the first contour LMs1, and fy is the focal length calculated based on the radius of curvature of the second contour LMs2.

[0058] The lens LM may include a cleaved surface CS. For example, the cleaved surface CS may be formed on both sides of the lens LM. However, both sides of the lens LM are not necessarily limited to being formed as cleaved surfaces CS. For example, only one side of the lens LM may be formed as a cleaved surface. The cleaved surface CS may be configured such that no light is incident. For example, the cleaved surface CS may be formed substantially parallel to the optical axis. The cleaved surface CS may be configured such that no light is reflected. For example, an anti-reflective layer may be formed on the cleaved surface CS.

[0059] The lens LM configured as described above can reduce the resolution degradation that inevitably occurs during injection molding. For example, the lens LM according to an exemplary embodiment can reduce the difference in light refraction and resolution generated in the shutter direction or in the direction perpendicular to the shutter.

[0060] Next, an optical imaging system according to an exemplary embodiment of the present disclosure will be described.

[0061] The optical imaging system according to exemplary embodiments of this disclosure can be mounted on the camera module of a portable terminal. However, the application scope of the optical imaging system is not limited to the camera module of a portable terminal. Furthermore, the optical imaging system can be selectively applied to multiple camera modules. As an example, the optical imaging system can be applied to any one of two or more camera modules mounted on a portable terminal. As another example, the optical imaging system can be applied to one or more of three or more camera modules mounted on a portable terminal.

[0062] An optical imaging system according to an exemplary embodiment can adjust the aberrations of light rays arriving at the imaging plane. For example, the optical imaging system can adjust the aberrations of light rays passing through a non-rotationally symmetric deformable lens. The deformable lens can be configured such that the radius of curvature of a first profile including the optical axis and the radius of curvature of a second profile including the optical axis are different. For example, in the deformable lens, the radius of curvature of the object-side surface of the first profile including the optical axis and the radius of curvature of the object-side surface of the second profile including the optical axis can be different. The deformable lens can be configured such that the lengths of the first profile and the second profile are different. For example, the length of the first profile can be greater than the length of the second profile.

[0063] An optical imaging system may include multiple lenses. For example, an optical imaging system may include a first lens, a second lens, and a third lens arranged sequentially from the object side. One of the first to third lenses may be a deformable lens. For example, the third lens may be a deformable lens with positive refractive power. However, the number of lenses configured in an optical imaging system is not limited to three. As an example, the optical imaging system may also include a fourth lens arranged on the image side of the third lens. As another example, the optical imaging system may also include a fourth lens and a fifth lens arranged sequentially on the image side of the third lens. The optical imaging system may include the deformable lenses described above. As an example, at least one of the third to fourth lenses may be configured as a deformable lens. The optical imaging system may include multiple deformable lenses. For example, the second and fourth lenses may be configured as deformable lenses.

[0064] An optical imaging system may include a lens with its sides cut off (hereinafter referred to as a cut-off lens). For example, one or more of the first to third lenses, the first to fourth lenses, or the first to fifth lenses constituting the optical imaging system may be a cut-off lens. The cut-off surface of the cut-off lens may be connected to the object-side side and the image-side side. The cut-off surface may be configured such that light does not incident on it. For example, the cut-off surface may be formed substantially parallel to the optical axis. The cut-off surface may be configured to prevent light reflection. For example, an anti-reflective layer may be formed on the cut-off surface.

[0065] The optical imaging system may also include optical path folding elements. For example, the optical imaging system may also include a prism disposed on the object side of the first lens.

[0066] Next, the features of the lens constituting the optical imaging system according to the exemplary embodiment will be described.

[0067] The first lens may have refractive power. For example, the first lens may have positive refractive power. The first lens may have aspherical surfaces. For example, both surfaces of the first lens may be aspherical. The first lens may have a predetermined refractive index. For example, the refractive index of the first lens may be 1.5 or greater and less than 1.56.

[0068] The second lens may have refractive power. For example, the second lens may have negative refractive power. The second lens may have aspherical surfaces. For example, both surfaces of the second lens may be aspherical. The second lens may have a predetermined refractive index. For example, the refractive index of the second lens may be 1.60 or greater but less than 1.66.

[0069] The third lens may have refractive power. For example, the third lens may have positive refractive power. The third lens may have aspherical surfaces. For example, both surfaces of the third lens may be aspherical. The third lens may have a predetermined refractive index. For example, the refractive index of the third lens may be 1.62 or greater and less than 1.7.

[0070] The fourth lens may have refractive power. For example, the fourth lens may have negative refractive power. The fourth lens may have aspherical surfaces. For example, both surfaces of the fourth lens may be aspherical. The fourth lens may have a predetermined refractive index. For example, the refractive index of the fourth lens may be 1.60 or greater but less than 1.66.

[0071] The fifth lens may have refractive power. For example, the fifth lens may have positive refractive power. The fifth lens may have aspherical surfaces. For example, both surfaces of the fifth lens may be aspherical. The fifth lens may have a predetermined refractive index. For example, the refractive index of the fifth lens may be 1.5 or greater and less than 1.56.

[0072] As described above, the first to fifth lenses can have aspherical shapes. The aspherical surface of each lens can be represented by the following Equation 1: Equation 1

[0073] Here, c is the reciprocal of the radius of curvature of the lens, k is the conic constant, r is the distance from a specific point on the aspherical surface of the lens to the optical axis, A to H and J are aspherical constants, and Z (or SAG) is the distance between a specific point on the aspherical surface of the lens at a distance r from the optical axis and the tangent plane intersecting the vertex of the aspherical surface of the lens.

[0074] In addition to the first to fifth lenses, the optical imaging system may also include other components, such as filters, apertures, and image sensors. The image sensor has an imaging surface disposed at the imaging plane of the optical imaging system.

[0075] An optical filter can be positioned between the lens closest to the imaging surface and the image sensor. The filter blocks certain wavelengths of incident light to improve the resolution of the optical imaging system. For example, a filter can block infrared wavelengths in the incident light. An aperture stop can be positioned on the object side of the foremost lens (the lens closest to the object side, also called the first lens), or between any two adjacent lenses from the first to the fifth lens, or between the fifth lens and the imaging surface. The optical imaging system may include two or more aperture stops positioned at different locations. The imaging surface can be positioned at the focal point of the optical imaging system, and the image sensor converts the image of the object formed by the lenses of the optical imaging system on the effective imaging area of ​​the imaging surface into an electrical signal.

[0076] An optical imaging system can satisfy one or more of the following conditional expressions: 0 < |(Rx1 - Ry1) / Ry1| < 0.5 0.2 < |(Rx1 - Ry1) / Rx2| < 2.0 0 < |fx - fy| < 0.5 mm 0 < |(fx - fy) / fx| < 0.01 0 < |(fx-fy) / f| < 0.005 0 < |(Rx1-Ry1) / Rx2| < 2.0 0.6 < (R10-R11x) / (R10-R11y) < 1.2 In the above conditional expressions, Rx1 is the radius of curvature of the object-side surface of the first profile of the deformable lens, Ry1 is the radius of curvature of the object-side surface of the second profile of the deformable lens, Rx2 is the radius of curvature of the image-side surface of the first profile of the deformable lens, fx is the focal length calculated based on the radius of curvature of the first profile of the deformable lens, fy is the focal length calculated based on the radius of curvature of the second profile of the deformable lens, f is the focal length of the optical imaging system, R10 is the radius of curvature of the image-side surface of the third lens, R11x is the radius of curvature of the object-side surface of the first profile of the fourth lens, and R11y is the radius of curvature of the object-side surface of the second profile of the fourth lens.

[0077] In the following, exemplary embodiments of this disclosure will be described in detail with reference to the accompanying drawings.

[0078] Reference Figure 3 An optical imaging system according to a first exemplary embodiment is described.

[0079] The optical imaging system 100 may include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, and a fifth lens 150.

[0080] The first lens 110 can have positive refractive power. The object-side surface of the first lens 110 can be convex, and its image-side surface can also be convex. The second lens 120 can have negative refractive power. The object-side surface of the second lens 120 can be convex, and its image-side surface can be concave. The third lens 130 can have positive refractive power. The object-side surface of the third lens 130 can be convex, and its image-side surface can also be convex. The fourth lens 140 can have negative refractive power. The object-side surface of the fourth lens 140 can be concave, and its image-side surface can also be concave. The fifth lens 150 can have positive refractive power. The object-side surface of the fifth lens 150 can be convex, and its image-side surface can also be concave. Among the above lenses, the fourth lens 140 can be a non-rotationally symmetric deformable lens.

[0081] The optical imaging system 100 may include a filter IF and an imaging surface IP. The filter IF may be disposed in front of the imaging surface IP to block infrared radiation and the like included in the incident light. The imaging surface IP may be formed on an image sensor IS. For example, the imaging surface IP may be formed on a surface of the image sensor IS. However, the imaging surface IP does not necessarily have to be formed on the image sensor IS. For example, the imaging surface IP may be formed on any type of component or device capable of converging light signals, such as an image film.

[0082] The optical imaging system 100 may also include a prism (not shown), which is an optical path folding element. The prism may be disposed on the object side of the first lens 110.

[0083] The optical imaging system 100 may include having Figure 1 Lenses of the shape shown. For example, one or more of the first lens 110 to the fifth lens 150 may have the shape shown. Figure 1 The cut surfaces CS are formed on both sides as shown.

[0084] Table 1 shows the characteristics of the lens of the optical imaging system 100 according to the present exemplary embodiment, and Table 2 shows the aspherical values ​​of the optical imaging system 100 according to the present exemplary embodiment. Figure 4 A graph showing curves representing the aberration characteristics of the optical imaging system 100 configured as described above is shown.

[0085] Table 1

[0086] Table 2

[0087] Reference Figure 5 An optical imaging system according to a second exemplary embodiment is described.

[0088] The optical imaging system 200 may include a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, and a fifth lens 250.

[0089] The first lens 210 can have positive refractive power. The object-side surface of the first lens 210 can be convex, and its image-side surface can also be convex. The second lens 220 can have negative refractive power. The object-side surface of the second lens 220 can be concave, and its image-side surface can also be concave. The third lens 230 can have positive refractive power. The object-side surface of the third lens 230 can be convex, and its image-side surface can also be concave. The fourth lens 240 can have negative refractive power. The object-side surface of the fourth lens 240 can be convex, and its image-side surface can also be concave. The fifth lens 250 can have positive refractive power. The object-side surface of the fifth lens 250 can be convex, and its image-side surface can also be concave. Among the above lenses, the fourth lens 240 can be a non-rotationally symmetric deformable lens.

[0090] Optical imaging system 200 may include a filter IF and an imaging surface IP. The filter IF may be disposed in front of the imaging surface IP to block infrared radiation and the like included in the incident light. The imaging surface IP may be formed on an image sensor IS. For example, the imaging surface IP may be formed on a surface of the image sensor IS. However, the imaging surface IP does not necessarily have to be formed on the image sensor IS. For example, the imaging surface IP may be formed on any type of component or device capable of converging light signals, such as an image film.

[0091] The optical imaging system 200 may also include a prism (not shown), which is an optical path folding element. The prism may be disposed on the object side of the first lens 210.

[0092] The optical imaging system 200 may include having Figure 1 Lenses of the shape shown. For example, one or more of the first lens 210 to the fifth lens 250 may have the shape shown. Figure 1 The cut surfaces CS are formed on both sides as shown.

[0093] Table 3 shows the characteristics of the lens of the optical imaging system 200 according to the present exemplary embodiment, and Table 4 shows the aspherical values ​​of the optical imaging system 200 according to the present exemplary embodiment. Figure 6 A graph showing curves representing the aberration characteristics of the optical imaging system 200 configured as described above is shown.

[0094] Table 3

[0095] Table 4

[0096] Reference Figure 7 An optical imaging system according to a third exemplary embodiment is described.

[0097] The optical imaging system 300 may include a first lens 310, a second lens 320, and a third lens 330.

[0098] The first lens 310 can have positive refractive power. The object-side surface of the first lens 310 can be convex, and its image-side surface can be concave. The second lens 320 can have negative refractive power. The object-side surface of the second lens 320 can be convex, and its image-side surface can be concave. The third lens 330 can have positive refractive power. The object-side surface of the third lens 330 can be convex, and its image-side surface can be concave. Among the above lenses, the third lens 330 can be a non-rotationally symmetric deformable lens.

[0099] The optical imaging system 300 may include a filter IF and an imaging surface IP. The filter IF may be disposed in front of the imaging surface IP to block infrared radiation and the like included in the incident light. The imaging surface IP may be formed on an image sensor IS. For example, the imaging surface IP may be formed on a surface of the image sensor IS. However, the imaging surface IP does not necessarily have to be formed on the image sensor IS. For example, the imaging surface IP may be formed on any type of component or device capable of converging light signals, such as an image film.

[0100] The optical imaging system 300 may also include a prism (not shown), which is an optical path folding element. The prism may be disposed on the object side of the first lens 310.

[0101] The optical imaging system 300 may include having Figure 1 Lenses of the shape shown. For example, one or more of the first lens 310 to the third lens 330 may have the shape shown. Figure 1 The cut surfaces CS are formed on both sides as shown.

[0102] Table 5 shows the characteristics of the lens of the optical imaging system 300 according to the present exemplary embodiment, and Table 6 shows the aspherical values ​​of the optical imaging system 300 according to the present exemplary embodiment. Figure 8 A graph showing curves representing the aberration characteristics of the optical imaging system 300 configured as described above is shown.

[0103] Table 5

[0104] Table 6

[0105] Reference Figure 9An optical imaging system according to a fourth exemplary embodiment is described.

[0106] The optical imaging system 400 may include a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, and a fifth lens 450.

[0107] The first lens 410 can have positive refractive power. The object-side surface of the first lens 410 can be convex, and its image-side surface can also be convex. The second lens 420 can have negative refractive power. The object-side surface of the second lens 420 can be concave, and its image-side surface can also be concave. The third lens 430 can have positive refractive power. The object-side surface of the third lens 430 can be convex, and its image-side surface can also be convex. The fourth lens 440 can have negative refractive power. The object-side surface of the fourth lens 440 can be concave, and its image-side surface can also be concave. The fifth lens 450 can have positive refractive power. The object-side surface of the fifth lens 450 can be convex, and its image-side surface can also be concave. Among the above lenses, the fourth lens 440 can be a non-rotationally symmetric deformable lens.

[0108] The optical imaging system 400 may include a filter IF and an imaging surface IP. The filter IF may be disposed in front of the imaging surface IP to block infrared radiation and the like included in the incident light. The imaging surface IP may be formed on an image sensor IS. For example, the imaging surface IP may be formed on a surface of the image sensor IS. However, the imaging surface IP does not necessarily have to be formed on the image sensor IS. For example, the imaging surface IP may be formed on any type of component or device capable of converging light signals, such as an image film.

[0109] The optical imaging system 400 may also include a prism (not shown), which is an optical path folding element. The prism may be disposed on the object side of the first lens 410.

[0110] The optical imaging system 400 may include having Figure 1 Lenses of the shape shown. For example, one or more of the first lens 410 to the fifth lens 450 may have the shape shown. Figure 1 The cut surfaces CS are formed on both sides as shown.

[0111] Table 7 shows the characteristics of the lens of the optical imaging system 400 according to the present exemplary embodiment, and Table 8 shows the aspherical values ​​of the optical imaging system 400 according to the present exemplary embodiment. Figure 10 A graph showing curves representing the aberration characteristics of the optical imaging system 400 configured as described above is shown.

[0112] Table 7

[0113] Table 8

[0114] Reference Figure 11 An optical imaging system according to a fifth exemplary embodiment is described.

[0115] The optical imaging system 500 may include a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, and a fifth lens 550.

[0116] The first lens 510 can have positive refractive power. The object-side surface of the first lens 510 can be convex, and its image-side surface can also be convex. The second lens 520 can have negative refractive power. The object-side surface of the second lens 520 can be concave, and its image-side surface can also be concave. The third lens 530 can have positive refractive power. The object-side surface of the third lens 530 can be convex, and its image-side surface can also be convex. The fourth lens 540 can have negative refractive power. The object-side surface of the fourth lens 540 can be concave, and its image-side surface can also be concave. The fifth lens 550 can have positive refractive power. The object-side surface of the fifth lens 550 can be convex, and its image-side surface can also be concave. Among the above lenses, the second lens 520 and the fourth lens 540 can be non-rotationally symmetric deformable lenses. The second lens 520 and the fourth lens 540 can be configured as deformable lenses with different characteristics. The second lens 520 may have a shape in which the radius of curvature of the object side in the first direction is greater than the radius of curvature of the object side in the second direction, while the fourth lens 540 may have a shape in which the radius of curvature of the object side in the first direction is smaller than the radius of curvature of the object side in the second direction.

[0117] The optical imaging system 500 may include a filter IF and an imaging surface IP. The filter IF may be disposed in front of the imaging surface IP to block infrared radiation and other light included in the incident light. The imaging surface IP may be formed on an image sensor IS. For example, the imaging surface IP may be formed on a surface of the image sensor IS. However, the imaging surface IP does not necessarily have to be formed on the image sensor IS. For example, the imaging surface IP may be formed on any type of component or device capable of converging light signals, such as an image film.

[0118] The optical imaging system 500 may also include a prism (not shown), which is an optical path folding element. The prism may be disposed on the object side of the first lens 510.

[0119] The optical imaging system 500 may include having Figure 1 Lenses of the shape shown. For example, one or more of the first lens 510 to the fifth lens 550 may have the shape shown. Figure 1 The cut surfaces CS are formed on both sides as shown.

[0120] Table 9 shows the characteristics of the lens of the optical imaging system 500 according to the present exemplary embodiment, and Table 10 shows the aspherical values ​​of the optical imaging system 500 according to the present exemplary embodiment. Figure 12 A graph showing curves representing the aberration characteristics of the optical imaging system 500 configured as described above is shown.

[0121] Table 9

[0122] Table 10

[0123] Reference Figure 13 An optical imaging system according to a sixth exemplary embodiment is described.

[0124] The optical imaging system 600 may include a first lens 610, a second lens 620, a third lens 630, and a fourth lens 640.

[0125] The first lens 610 can have positive refractive power. The object-side surface of the first lens 610 can be convex, and its image-side surface can also be convex. The second lens 620 can have negative refractive power. The object-side surface of the second lens 620 can be concave, and its image-side surface can also be concave. The third lens 630 can have positive refractive power. The object-side surface of the third lens 630 can be convex, and its image-side surface can also be convex. The fourth lens 640 can have negative refractive power. The object-side surface of the fourth lens 640 can be concave, and its image-side surface can also be concave. In the above lenses, the second lens 620 and the fourth lens 640 can be non-rotationally symmetric deformable lenses. The second lens 620 and the fourth lens 640 can be configured as deformable lenses with different characteristics. For example, the second lens 620 can have a shape where the radius of curvature of its object-side surface in a first direction is greater than the radius of curvature of its object-side surface in a second direction, while the fourth lens 640 can have a shape where the radius of curvature of its object-side surface in the first direction is smaller than the radius of curvature of its object-side surface in the second direction.

[0126] The optical imaging system 600 may include a filter IF and an imaging surface IP. The filter IF may be disposed in front of the imaging surface IP to block infrared radiation and the like included in the incident light. The imaging surface IP may be formed on an image sensor IS. For example, the imaging surface IP may be formed on a surface of the image sensor IS. However, the imaging surface IP does not necessarily have to be formed on the image sensor IS. For example, the imaging surface IP may be formed on any type of component or device capable of converging light signals, such as an image film.

[0127] The optical imaging system 600 may also include a prism (not shown), which is an optical path folding element. The prism may be disposed on the object side of the first lens 610.

[0128] The optical imaging system 600 may include having Figure 1 Lenses of the shape shown. For example, one or more of the first lens 610 to the fourth lens 640 may have the shape shown. Figure 1 The cut surfaces CS are formed on both sides as shown.

[0129] Table 11 shows the characteristics of the lens of the optical imaging system 600 according to the present exemplary embodiment, and Table 12 shows the aspherical values ​​of the optical imaging system 600 according to the present exemplary embodiment. Figure 14 A graph showing curves representing the aberration characteristics of the optical imaging system 600 configured as described above is shown.

[0130] Table 11

[0131] Table 12

[0132] Table 13 shows the optical characteristics of the optical imaging systems according to the first exemplary embodiment to the sixth exemplary embodiment.

[0133] Table 13

[0134] In Table 13, TTL is the distance from the object side of the first lens to the image plane, BFL is the distance from the image side of the lens closest to the image plane to the image plane, HFOV is the half-angle, and IMG HT is the height of the image plane (half the diagonal length of the image plane). f1 is the focal length of the first lens, f2x is the focal length of the second lens calculated based on the radius of curvature of the first profile, f2y is the focal length of the second lens calculated based on the radius of curvature of the second profile, f3x is the focal length of the third lens calculated based on the radius of curvature of the first profile, f3y is the focal length of the third lens calculated based on the radius of curvature of the second profile, f4x is the focal length of the fourth lens calculated based on the radius of curvature of the first profile, f4y is the focal length of the fourth lens calculated based on the radius of curvature of the second profile, and f5 is the focal length of the fifth lens.

[0135] Tables 14 and 15 represent the values ​​of the conditional expressions for the optical imaging systems according to the first exemplary embodiment to the sixth exemplary embodiment.

[0136] Table 14

[0137] Table 15

[0138] As described above, according to the exemplary embodiments in this disclosure, resolution degradation due to asymmetrical shapes can be significantly reduced.

[0139] While specific exemplary embodiments have been shown and described above, it will be apparent upon understanding this disclosure 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 interpreted in a descriptive sense only and not for limiting purposes. The description of features or aspects in each example should be considered applicable to similar features or aspects in other examples. Suitable results may also be obtained if the described techniques are performed in a different order, and / or if components in the described system, architecture, apparatus, or circuit are combined in different ways and / or replaced or supplemented with 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, comprising: A first lens with positive refractive power; A second lens with negative refractive power; as well as A third lens with positive refractive power, The first lens to the third lens are arranged sequentially from the object side toward the imaging surface of the optical imaging system. The optical imaging system comprises three lenses with refractive power, and The third lens is a deformable lens, wherein the first profile of the deformable lens in the first direction intersecting the optical axis and the second profile in the second direction intersecting the optical axis are different from each other.

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

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

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

5. An optical imaging system, comprising: A first lens with positive refractive power; A second lens with negative refractive power; A third lens with positive refractive power; as well as A fourth lens with negative refractive power. The first lens to the fourth lens are arranged sequentially from the object side toward the imaging surface of the optical imaging system. The optical imaging system comprises a total of four lenses with refractive power, and Each of the second lens and the fourth lens is a deformable lens, wherein the first profile of the deformable lens in a first direction intersecting the optical axis and the second profile in a second direction intersecting the optical axis are different from each other.

6. The optical imaging system according to claim 5, wherein, The first lens has a convex object-side surface.

7. The optical imaging system according to claim 5, wherein, The second lens has a concave object-side surface.

8. The optical imaging system according to claim 5, wherein, The third lens has a convex object-side surface.

9. The optical imaging system according to claim 5, wherein, The fourth lens has a concave image-side surface.

10. An optical imaging system, comprising: A first lens with positive refractive power; A second lens with negative refractive power; A third lens with positive refractive power; A fourth lens with negative refractive power; as well as The fifth lens with positive refractive power The first lens to the fifth lens are arranged sequentially from the object side toward the imaging surface of the optical imaging system. The optical imaging system comprises a total of five lenses with refractive power, and The fourth lens is a deformable lens, wherein the first profile of the deformable lens in the first direction intersecting the optical axis and the second profile in the second direction intersecting the optical axis are different from each other.

11. The optical imaging system according to claim 10, wherein, The first lens has a convex object-side surface.

12. The optical imaging system according to claim 10, wherein, The second lens has a concave image-side surface.

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

14. The optical imaging system according to claim 10, wherein, The fourth lens has a concave image-side surface.

15. The optical imaging system according to claim 10, wherein, The fifth lens has a concave image-side surface.

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