Optical image capturing system

Abstract

An optical image capturing system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens disposed in order from an object side. The first lens has a refractive power of a sign different from a sign of a refractive power of the second lens. One of an image-side surface of the fifth lens and an object-side surface of the sixth lens is convex, and the other is concave. One of the fourth to sixth lenses has two surfaces having a free-form surface shape.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2020-0131364 filed on October 12, 2020, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety for all purposes by reference. Technical Field

[0003] The present disclosure relates to optical imaging systems configured to improve light aberrations. Background Art

[0004] An optical imaging system generally includes a plurality of lenses and an image sensor. The lens may be formed to have a shape that is substantially rotationally symmetrical about an optical axis. For example, the lens may be formed to have a substantially circular shape. Since a circular lens may be manufactured by injection molding, its mass production may be facilitated.

[0005] Unlike a lens, an image sensor is generally formed to have a rectangular shape rather than a circular shape. For example, an image sensor can be formed to have a substantially rectangular shape. An image sensor is generally formed to be larger than a lens. For example, the maximum effective radius of a lens is generally smaller than the image height of the image sensor (half the diagonal length of the image sensor).

[0006] The above-mentioned difference in shape and size between the lens and the image sensor may hinder the improvement of the aberration of the optical imaging system. Therefore, it is necessary to develop an optical imaging system that can improve the optical performance according to the difference in shape and size between the lens and the image sensor.

[0007] The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with respect to the present disclosure. Summary of the invention

[0008] The purpose of providing this summary is to introduce a selection of inventive concepts in a concise form, and these inventive concepts will be further described in the following detailed description. This summary is not intended to identify the key features or essential features of the subject matter claimed, nor is it intended to help determine the scope of the subject matter claimed.

[0009] In a general aspect, an optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in order from an object side. The first lens has a refractive power of a sign different from that of the refractive power of the second lens. One of the image side surface of the fifth lens and the object side surface of the sixth lens is convex, and the other is concave. One of the fourth lens to the sixth lens has two surfaces with free-form surface shapes.

[0010] The first lens may have positive refractive power.

[0011] The fourth lens may have negative refractive power.

[0012] The half field of view (HFOV) of the optical imaging system can be 20 degrees to 46 degrees.

[0013] The fifth lens may have a convex image-side surface.

[0014] The sixth lens may have a concave image-side surface.

[0015] The fifth lens may have negative refractive power.

[0016] The sixth lens may have a convex image-side surface.

[0017] The first lens may have negative refractive power.

[0018] The fourth lens may have positive refractive power.

[0019] The sixth lens may have a concave image-side surface.

[0020] The half field of view (HFOV) of the optical imaging system can be 52 degrees to 68 degrees.

[0021] The camera module may include an optical imaging system and an image sensor configured to convert an optical signal of the optical imaging system into an electrical signal.

[0022] The mobile terminal device may include a camera module.

[0023] The mobile terminal device may include a plurality of camera modules, wherein the plurality of camera modules may include one or more camera modules having an optical imaging system and an image sensor.

[0024] In another general aspect, an optical imaging system includes: a first lens having a convex object side surface, a second lens having refractive power, a third lens having refractive power, a fourth lens having a concave image side surface, a fifth lens having positive refractive power or negative refractive power, and a sixth lens having a refractive power with a sign different from the sign of the refractive power of the fifth lens, wherein the first lens to the sixth lens are arranged in sequence from the object side, and wherein one of the fourth lens to the sixth lens has two surfaces with a free-form surface shape.

[0025] The second lens may have a concave image-side surface.

[0026] The fifth lens may have a concave image-side surface, or the sixth lens may have a concave object-side surface.

[0027] Other features and aspects will become apparent from the following detailed description, the accompanying drawings, and the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a side view of the optical imaging system according to the first example in the YZ direction.

[0029] Figure 2 is a side view of the optical imaging system according to the first example in the XZ direction.

[0030] Figure 3 is a diagram showing distortion aberration of the optical imaging system according to the first example.

[0031] Figure 4 is a diagram showing a root mean square (RMS) spot of the optical imaging system according to the first example.

[0032] Figure 5 is a side view of the optical imaging system according to the second example in the YZ direction.

[0033] Figure 6 is a side view of the optical imaging system according to the second example in the XZ direction.

[0034] Figure 7 is a diagram showing distortion aberration of the optical imaging system according to the second example.

[0035] Figure 8 is a diagram showing an RMS spot of an optical imaging system according to a second example.

[0036] Fig. 9 is a side view of the optical imaging system according to the third example in the YZ direction.

[0037] Fig.10 is a side view of the optical imaging system according to the third example in the XZ direction.

[0038] Fig.11 is a diagram showing distortion aberration of the optical imaging system according to the third example.

[0039] Fig.12 is a diagram showing an RMS spot of an optical imaging system according to a third example.

[0040] Fig.13is a side view of the optical imaging system according to the fourth example in the YZ direction.

[0041] Fig.14 is a side view of the optical imaging system according to the fourth example in the XZ direction.

[0042] Fig.15 is a diagram showing distortion aberration of the optical imaging system according to the fourth example.

[0043] Fig.16 is a diagram showing an RMS spot of an optical imaging system according to a fourth example.

[0044] Fig.17 is a side view of the optical imaging system according to the fifth example in the YZ direction.

[0045] Fig.18 is a side view of the optical imaging system according to the fifth example in the XZ direction.

[0046] Fig.19 is a diagram showing distortion aberration of the optical imaging system according to the fifth example.

[0047] Fig. 20 is a diagram showing an RMS spot of an optical imaging system according to a fifth example.

[0048] Fig.21 is a side view of the optical imaging system according to the sixth example in the YZ direction.

[0049] Fig. 22 is a side view of the optical imaging system according to the sixth example in the XZ direction.

[0050] Fig.23 is a diagram showing distortion aberration of the optical imaging system according to the sixth example.

[0051] Fig.24 is a diagram showing an RMS spot of an optical imaging system according to a sixth example.

[0052] Throughout the drawings and detailed description, 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 sizes, proportions, and depictions of elements in the drawings may be exaggerated. DETAILED DESCRIPTION

[0053] Hereinafter, although examples of the present disclosure will be described in detail with reference to the accompanying drawings, it should be noted that the examples are not limited thereto.

[0054] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described in this application. However, various changes, modifications and equivalents of the methods, devices and / or systems described in this application will be apparent after understanding the present disclosure. For example, the order of operations described in this application is merely an example, and except for operations that must occur in a specific order, it is not limited to the order set forth in this application, but can be changed, which will be apparent after understanding the present disclosure. In addition, for greater clarity and brevity, the description of the functions and structures that will be known in the art may be omitted.

[0055] The features described in this application can be implemented in different forms and should not be understood as being limited to the examples described in this application. Rather, the examples described in this application are provided only to illustrate some of the many possible ways to implement the methods, devices and / or systems described in this application that will be apparent after understanding this disclosure.

[0056] It should be noted that in this application, the use of the word "may" with respect to examples or embodiments, for example, regarding what an example or embodiment may include or implement, means that there is at least one example or embodiment that includes or implements such features, and all examples and embodiments are not limited thereto.

[0057] Throughout the specification, when an element such as a layer, region, or substrate is described as being "on," "connected to," or "coupled to" another element, the element may be directly "on," "connected to," or "coupled 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 coupled to" another element, there are no other elements between the element and the other element. As used in this application, a "portion" of an element may include the entire element or less than the entire element.

[0058] 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; similarly, "at least one" includes any one of the associated listed items and any combination of any two or more items.

[0059] Although the terms "first", "second" and "third" may be used in this application to describe various members, components, regions, layers or parts, these members, components, regions, layers or parts are not limited by these terms. More specifically, these terms are only used to distinguish one member, component, region, layer or part from another member, component, region, layer or part. Therefore, without departing from the teachings of the examples described in this application, the first member, first component, first region, first layer or first part mentioned in these examples may also be referred to as the second member, second component, second region, second layer or second part.

[0060] Spatially relative terms such as "above", "higher", "below", "lower", etc. may be used in this application for descriptive convenience to describe the relationship of one element relative to another element as shown in the accompanying drawings. In addition to covering the orientations depicted in the accompanying drawings, these spatially relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the accompanying drawings is flipped, an element described as being "above" or "higher" relative to another element will be "below" or "lower" relative to the other element. Therefore, depending on the spatial orientation of the device, the term "above" covers both orientations of "above" and "below". The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used in this application should be interpreted accordingly.

[0061] The terms used in this application are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the articles "a", "an" and "the" are intended to also include plural forms. The words "include", "comprise" and "have" indicate the presence of the features, numbers, operations, components, elements and / or their combinations, but do not exclude the presence or addition of one or more other features, numbers, operations, components, elements and / or their combinations.

[0062] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described in the present application are not limited to the specific shapes shown in the drawings, but include variations in shapes that occur during manufacturing.

[0063] Features of the examples described in this application may be combined in various ways that will be apparent after understanding the present disclosure. In addition, although the examples described in this application have various configurations, other configurations that will be apparent after understanding the present disclosure are also possible.

[0064] An aspect of the present disclosure is to provide an optical imaging system configured to improve optical performance according to differences in shape and size between a lens and an image sensor.

[0065] The optical imaging system includes a plurality of lenses arranged along an optical axis. The plurality of lenses may be spaced apart from each other by a predetermined distance along the optical axis.

[0066] For example, the optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, which are arranged in ascending numerical order along the optical axis from the object side of the optical imaging system toward the imaging plane of the optical imaging system, wherein the first lens is closest to the object side of the optical imaging system and the sixth lens is closest to the imaging plane.

[0067] In each lens, the object-side or first surface is the surface of the lens closest to the object side of the optical imaging system, and the image-side or second surface is the surface of the lens closest to the imaging plane.

[0068] Unless otherwise specified, reference to the shape of a lens surface refers to the shape of a paraxial region of the lens surface. The paraxial region of the lens surface is a central portion of the lens surface that surrounds and includes the optical axis of the lens surface, in which light rays incident on the lens surface form a small angle θ with the optical axis, and the approximations of sinθ≈θ, tanθ≈θ, and cosθ≈θ are valid.

[0069] In the example, the first lens refers to the lens closest to the object (or subject), and the sixth lens refers to the lens closest to the imaging plane (or image sensor). In the example, the units of the radius of curvature, thickness, total track length (TTL) (axial distance between the object side of the first lens and the imaging plane), IMGHT (half the diagonal length of the imaging plane), and focal length are expressed in millimeters (mm). The thickness of the lens, the gap between the lenses, and TTL refer to the distance of the lenses on the optical axis. In addition, in the description of the shape of the lens, a configuration in which one face is convex indicates that the optical axis area of ​​the face is convex, and a configuration in which one face is concave indicates that the optical axis area of ​​the face is concave. Therefore, even when one face of the lens is described as convex, the edge of the lens may be concave. Similarly, even when one face of the lens is described as concave, the edge of the lens may be convex.

[0070] According to the optical imaging system of the present disclosure, a non-rotationally symmetric lens can be used to adjust the aberration of light reaching the image sensor. For example, the optical imaging system may include a lens having a free-form surface. The free-form surface can be formed on both faces of the lens. The optical imaging system can be installed in a camera module for a mobile terminal device. However, the scope of application of the optical imaging system is not limited to the camera module for the mobile terminal device. In addition, the optical imaging system can be selectively applied to multiple camera modules. As an example, the optical imaging system can be applied to one camera module among two or more camera modules installed in a mobile terminal device. As another example, the optical imaging system can be applied to one or more camera modules among three or more camera modules installed in a mobile terminal device.

[0071] In the following description, an optical imaging system according to one or more examples will be described.

[0072] The optical imaging system according to the example may include a plurality of lenses. For example, the optical imaging system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side. Each of the first to sixth lenses may have a predetermined refractive power. The refractive power of the first lens and the refractive power of the second lens may have a predetermined correlation. For example, the first lens may have a refractive power of a sign different from the sign of the refractive power of the second lens. For example, when the second lens has a positive refractive power, the first lens may have a negative refractive power. As another example, when the second lens has a negative refractive power, the first lens may have a positive refractive power. The shape of the fifth lens and the shape of the sixth lens may have a predetermined correlation. For example, one of the image side surface of the fifth lens and the object side surface of the sixth lens may be convex, and the other may be concave. For example, when the image side surface of the fifth lens is convex, the object side surface of the sixth lens is concave. As another example, when the image side surface of the fifth lens is concave, the object side surface of the sixth lens is convex. The optical imaging system may include a non-rotationally symmetric lens. For example, one of the fourth to sixth lenses may have two surfaces with free-curved surface shapes.

[0073] The optical imaging system according to the example may have a feature that varies according to the refractive power of the first lens. For example, the refractive power of the fourth lens and the half field of view (HFOV) of the optical imaging system may vary according to the refractive power of the first lens. For example, when the first lens has a positive refractive power, the HFOV of the optical imaging system may be 20 degrees to 46 degrees. As another example, when the first lens has a negative refractive power, the HFOV of the optical imaging system may be 52 degrees to 68 degrees.

[0074] In the following description, features of lenses constituting an optical imaging system according to one or more examples will be described.

[0075] The first lens may have a refractive power. For example, the first lens may have a positive refractive power or a negative refractive power. The first lens may have an aspheric surface. For example, both surfaces of the first lens may be aspheric. The first lens may have a predetermined refractive index. For example, the refractive index of the first lens may be 1.5 or greater to less than 1.6.

[0076] The second lens may have a refractive power. For example, the second lens may have a positive refractive power or a negative refractive power. The second lens may have an aspherical surface. 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 1.5 or greater to less than 1.7. The refractive index of the second lens may be greater than or equal to the refractive index of the first lens.

[0077] The third lens may have a refractive power. For example, the third lens may have a positive refractive power or a negative refractive power. The third lens may have an aspherical surface. For example, two 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 1.5 or more to less than 1.7.

[0078] The fourth lens may have a refractive power. For example, the fourth lens may have a positive refractive power or a negative refractive power. The refractive power of the fourth lens may have a sign different from the sign of the refractive power of the first lens. For example, when the first lens has a positive refractive power, the fourth lens may have a negative refractive power. Meanwhile, when the first lens has a negative refractive power, the fourth lens may have a positive refractive power. The fourth lens may have an aspherical surface. For example, both surfaces of the fourth lens may be aspherical. As required, the fourth lens may have a free-form surface. For example, when both surfaces of the fifth lens and the sixth lens are rotationally symmetric, both surfaces of the fourth lens may be formed as free-form surfaces. The fourth lens may have a predetermined refractive index. For example, the refractive index of the fourth lens may be 1.5 or greater to less than 1.7.

[0079] The fifth lens may have a refractive power. For example, the fifth lens may have a positive refractive power or a negative refractive power. One surface of the fifth lens may be convex or concave. For example, the fifth lens may have a convex object side surface. Alternatively, the fifth lens may have a concave image side surface. The fifth lens may have an aspherical surface. For example, both surfaces of the fifth lens may be aspherical. As needed, the fifth lens may have a free-form surface. For example, when both surfaces of the fourth lens and the sixth lens are rotationally symmetric, both surfaces of the fifth lens may be formed as free-form surfaces. The fifth lens may have a predetermined refractive index. For example, the refractive index of the fifth lens may be 1.5 or greater to less than 1.7.

[0080] The sixth lens may have a refractive power. For example, the sixth lens may have a positive refractive power or a negative refractive power. One surface of the sixth lens may be convex or concave. For example, the sixth lens may have a convex object side surface. Alternatively, the sixth lens may have a concave image side surface. However, the shape of the sixth lens is not limited to the above examples. For example, when the fifth lens has a negative refractive power, the sixth lens may have a convex image side surface. The sixth lens may have an aspherical surface. For example, both surfaces of the sixth lens may be aspherical. As needed, the sixth lens may have a free-form surface. For example, when both surfaces of the fourth lens and the fifth lens are rotationally symmetric, the two surfaces of the sixth lens may be formed as free-form surfaces. The sixth lens may have a predetermined refractive index. For example, the refractive index of the sixth lens may be 1.5 or greater to less than 1.7.

[0081] In the following description, an optical imaging system according to one or more other examples will be described.

[0082] According to another example, an optical imaging system may include a plurality of lenses. For example, the optical imaging system may include a first lens, a second lens, and a third lens, each having a convex object side surface, and a fourth lens, a fifth lens, and a sixth lens, each having a concave image side surface. The first lens to the sixth lens may be arranged in sequence from the object side. For example, the first lens may be arranged closest to the object, and the sixth lens may be arranged closest to the imaging surface (or image sensor). The first lens to the sixth lens may have a refractive power. For example, the first lens to the sixth lens may have a positive refractive power or a negative refractive power. The refractive power of the fifth lens and the refractive power of the sixth lens may have a predetermined correlation. For example, the sixth lens may have a refractive power with a sign different from the sign of the refractive power of the fifth lens. For example, when the fifth lens has a positive refractive power, the sixth lens may have a negative refractive power. As another example, when the fifth lens has a negative refractive power, the sixth lens may have a positive refractive power. The optical imaging system may include a non-rotationally symmetric lens. For example, one of the fourth lens to the sixth lens may have two surfaces with free-form surfaces.

[0083] In the following description, features of lenses constituting the optical imaging system will be described.

[0084] The first lens may have a refractive power. For example, the first lens may have a positive refractive power or a negative refractive power. The first lens may have an aspheric surface. For example, both surfaces of the first lens may be aspheric. The first lens may have a predetermined refractive index. For example, the refractive index of the first lens may be 1.5 or greater to less than 1.6.

[0085] The second lens may have a refractive power. For example, the second lens may have a positive refractive power or a negative refractive power. One surface of the second lens may be concave. For example, the second lens may have a concave image side surface. The second lens may have an aspherical surface. 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 1.5 or greater and less than 1.7. The refractive index of the second lens may be greater than or equal to the refractive index of the first lens.

[0086] The third lens may have a refractive power. For example, the third lens may have a positive refractive power or a negative refractive power. The third lens may have an aspherical surface. For example, two 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 1.5 or more to less than 1.7.

[0087] The fourth lens may have a refractive power. For example, the fourth lens may have a positive refractive power or a negative refractive power. The refractive power of the fourth lens may have a sign different from the sign of the refractive power of the first lens. For example, when the first lens has a positive refractive power, the fourth lens may have a negative refractive power. Meanwhile, when the first lens has a negative refractive power, the fourth lens may have a positive refractive power. The fourth lens may have an aspherical surface. For example, both surfaces of the fourth lens may be aspherical. As required, the fourth lens may have a free-form surface. For example, when both surfaces of the fifth lens and the sixth lens are rotationally symmetric, both surfaces of the fourth lens may be formed as free-form surfaces. The fourth lens may have a predetermined refractive index. For example, the refractive index of the fourth lens may be 1.5 or greater to less than 1.7.

[0088] The fifth lens may have a refractive power. For example, the fifth lens may have a positive refractive power or a negative refractive power. The fifth lens may have an aspherical surface. For example, both surfaces of the fifth lens may be aspherical. As required, the fifth lens may have a free-form surface. For example, when both surfaces of the fourth lens and the sixth lens are rotationally symmetric, both surfaces of the fifth lens may be formed as free-form surfaces. The fifth lens may have a predetermined refractive index. For example, the refractive index of the fifth lens may be 1.5 or greater to less than 1.7.

[0089] The sixth lens may have a refractive power. For example, the sixth lens may have a positive refractive power or a negative refractive power. The sixth lens may have an aspherical surface. For example, both surfaces of the sixth lens may be aspherical. As required, the sixth lens may have a free-form surface. For example, when both surfaces of the fourth lens and the fifth lens are rotationally symmetric, both surfaces of the sixth lens may be formed as free-form surfaces. The sixth lens may have a predetermined refractive index. For example, the refractive index of the sixth lens may be 1.5 or greater to less than 1.7.

[0090] One of the fifth lens and the sixth lens may have a concave shape. For example, the fifth lens may have a concave image-side surface, or the sixth lens may have a concave object-side surface.

[0091] The lens constituting the optical imaging system may be formed of a material having a refractive index different from that of air. For example, the lens may be formed of a plastic material or a glass material. As described above, each of the first to sixth lenses may have an aspherical surface. The aspherical surface of each of the first to sixth lenses may be represented by the following equation 1:

[0092] (Equation 1)

[0093]

[0094] In Equation 1, "c" is the inverse of the radius of curvature of each lens, "k" is the cone constant, "r" is the distance from a 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 height from a point on the aspherical surface to the vertex of the aspherical surface in the optical axis direction.

[0095] The free-form surface of the lens can be expressed by equations 2 and 3 using XY polynomials as follows:

[0096] (Equation 2)

[0097]

[0098] (Equation 3)

[0099] r 2 =x 2 +y 2

[0100] The optical imaging system may also include filters, apertures and image sensors.

[0101] The filter can be disposed between the image sensor and the lens disposed closest to the imaging surface. The filter can block some wavelengths of incident light to improve the resolution of the optical imaging system. For example, the filter can block infrared wavelengths of incident light. The optical imaging system can include an image sensor. The image sensor can be configured to convert an optical signal (image) into an electrical signal. The surface of the image sensor can form an imaging surface of the optical imaging system.

[0102] The optical imaging system may satisfy one or more of the following conditional expressions.

[0103] -4.0 <f1 / f2<-0.1

[0104] 0.5<|f1 / f5|<2.0

[0105] -2.0 <f5 / f6<-0.1

[0106] 0.10 <R10 / R11<3.0

[0107] 5.0μm≤SAGdifSO<150μm

[0108] 5.0μm≤SAGdifSI<800μm

[0109] 0.03 <SAGdifSO / SAGdifSI<1.2

[0110] 0.6 <TTL / (IMGHT*2)<1.1

[0111] In the above conditional expressions, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, R10 is the radius of curvature of the image side surface of the fifth lens, R11 is the radius of curvature of the object side surface of the sixth lens, SAGdifSO is the deviation between the X-direction SAG and the Y-direction SAG of the object side surface of the lens having a free-form surface, SAGdifSI is the deviation between the X-direction SAG and the Y-direction SAG of the image side surface of the lens having a free-form surface, the total track length (TTL) is the axial distance between the object side surface of the first lens and the imaging plane, and IMGHT is the height of the imaging plane (half the diagonal length).

[0112] In the following description, various examples of optical imaging systems will be described.

[0113] In the following, reference will be made to Figure 1 and Figure 2 An optical imaging system 100 according to a first example is described. Figure 1 shows the optical imaging system 100 in the YZ direction, and Figure 2 The optical imaging system 100 is shown in the XZ direction.

[0114] The optical imaging system 100 may include a first lens 110 , a second lens 120 , a third lens 130 , a fourth lens 140 , a fifth lens 150 , and a sixth lens 160 .

[0115] The first lens 110 may have positive refractive power. The first lens 110 may have a convex object side surface and a concave image side surface. The second lens 120 may have negative refractive power. The second lens 120 may have a convex object side surface and a concave image side surface. The third lens 130 may have positive refractive power. The third lens 130 may have a convex object side surface and a convex image side surface. The fourth lens 140 may have negative refractive power. The fourth lens 140 may have a convex object side surface and a concave image side surface. The fifth lens 150 may have positive refractive power. The fifth lens 150 may have a convex object side surface and a convex image side surface. Inflection points may be formed on the object side surface and the image side surface of the fifth lens 150. The sixth lens 160 may have negative refractive power. The sixth lens 160 may have a concave object side surface and a concave image side surface. The object side surface and the image side surface of the sixth lens 160 are formed as free-form surfaces.

[0116] The optical imaging system 100 may further include an optical filter IF and an image sensor IP.

[0117] The filter IF may be disposed in front of the image sensor IP to block infrared rays, etc. included in the incident light. The image sensor IP may include a plurality of optical sensors. The image sensor IP may be configured to convert an optical signal into an electrical signal.

[0118] Table 1 lists the lens properties of the optical imaging system 100 according to the first example, Table 2 lists the aspheric surface values ​​of the optical imaging system 100 according to the first example, and Table 3 lists the X values ​​of the monomial representing the free-form surface of the optical imaging system 100 according to the first example. n Y n Coefficient value. Figure 3 and Figure 4 is a diagram showing aberration curves of the optical imaging system 100 configured as described above.

[0119] Table 1

[0120] Face number mark Radius of curvature Thickness / distance Refractive Index Abbe number Effective radius S1 First lens 1.923 0.808 1.546 55.990 1.440 S2 7.344 0.084 1.371 S3(Aperture) Second lens 4.798 0.230 1.677 19.238 1.290 S4 3.010 0.544 1.140 S5 The third lens 98.881 0.366 1.546 55.990 1.180 S6 -50.756 0.302 1.325 S7 The fourth lens 11.518 0.335 1.677 19.238 1.468 S8 6.545 0.420 1.751 S9 Fifth lens 7.192 0.763 1.546 55.990 2.150 S10 -1.614 0.470 2.337 S11 The sixth lens -1.603 0.300 1.546 55.990 2.848 S12 4.762 0.177 3.205 S13 Optical Filters infinity 0.210 1.518 64.166 3.813 S14 infinity 0.670 3.874 S15 Imaging surface infinity 0.020

[0121] Table 2

[0122]

[0123]

[0124] Table 3

[0125] mark S11 (XY polynomial) S12 (XY polynomial) k -5.247311983 -0.633607968 <![CDATA[X 4 ]]> -0.046419321 -0.037912874 <![CDATA[X 2 *AND 2 ]]> -0.092505758 -0.075584121 <![CDATA[Y 4 ]]> -0.045677685 -0.036692250 <![CDATA[X 6 ]]> 0.010762109 0.005201984 <![CDATA[X 4 *AND 2 ]]> 0.033147991 0.015867212 <![CDATA[X 2 *AND 4 ]]> 0.032647984 0.015809116 <![CDATA[Y 6 ]]> 0.010520166 0.004884637 <![CDATA[X 8 ]]> -0.000824043 -0.000542624 <![CDATA[X 6 *AND 2 ]]> -0.003535020 -0.002126024 <![CDATA[X 4 *AND 4 ]]> -0.005317549 -0.003288797 <![CDATA[X 2 *AND 6 ]]> -0.003342676 -0.002092199 <![CDATA[Y 8 ]]> -0.000760797 -0.000502259 <![CDATA[X 10 ]]> 0.000021441 0.000019136 <![CDATA[X 8 *AND 2 ]]> 0.000105278 0.000083851 <![CDATA[X 6 *AND 4 ]]> 0.000256833 0.000181843 <![CDATA[X 4 *AND 6 ]]> 0.000206103 0.000180055 <![CDATA[X 2 *AND 8 ]]> 0.000104012 0.000081805 <![CDATA[Y 10 ]]> 0.000017093 0.000019739

[0126] In the following, reference will be made to Figure 5 and Figure 6 An optical imaging system 200 according to a second example is described. Figure 5shows the optical imaging system 200 in the YZ direction, and Figure 6 The optical imaging system 200 is shown in the XZ direction.

[0127] The optical imaging system 200 may include a first lens 210 , a second lens 220 , a third lens 230 , a fourth lens 240 , a fifth lens 250 , and a sixth lens 260 .

[0128] The first lens 210 may have positive refractive power. The first lens 210 may have a convex object-side surface and a concave image-side surface. The second lens 220 may have negative refractive power. The second lens 220 may have a convex object-side surface and a concave image-side surface. The third lens 230 may have positive refractive power. The third lens 230 may have a convex object-side surface and a concave image-side surface. An inflection point may be formed on the object-side surface and the image-side surface of the third lens 230. The fourth lens 240 may have negative refractive power. The fourth lens 240 may have a convex object-side surface and a concave image-side surface. An inflection point may be formed on the object-side surface and the image-side surface of the fourth lens 240. The fifth lens 250 may have positive refractive power. The fifth lens 250 may have a convex object-side surface and a convex image-side surface. An inflection point may be formed on the object-side surface and the image-side surface of the fifth lens 250. The sixth lens 260 may have negative refractive power. The sixth lens 260 may have a concave object-side surface and a concave image-side surface. The object-side surface and the image-side surface of the sixth lens 260 may be formed as free-curved surfaces.

[0129] The optical imaging system 200 may further include an optical filter IF and an image sensor IP.

[0130] The filter IF may be disposed in front of the image sensor IP to block infrared rays, etc. included in the incident light. The image sensor IP may include a plurality of optical sensors. The image sensor IP may be configured to convert an optical signal into an electrical signal.

[0131] Table 4 lists the lens properties of the optical imaging system 200 according to the second example, Table 5 lists the aspheric surface values ​​of the optical imaging system 200 according to the second example, and Table 6 lists the X values ​​of the monomial representing the free-form surface of the optical imaging system 200 according to the second example. n Y n Coefficient value. Figure 7 and Figure 8 is a diagram showing aberration curves of the optical imaging system 200 configured as described above.

[0132] Table 4

[0133]

[0134]

[0135] Table 5

[0136] Face number S1 S2 S3 S4 S5 k -0.98513 -23.25336 21.36453 5.85935 -65.75838 A 0.00312 -0.00967 -0.14734 -0.12034 -0.03398 B 0.18191 -0.25617 0.29791 0.50950 -0.52664 C -0.68746 1.26258 -0.95981 -2.26163 2.92887 D 1.63266 -3.30731 3.11155 7.75816 -9.32779 E -2.44287 5.28002 -6.60736 -16.88820 17.76489 F 2.31956 -5.24868 8.72524 22.98225 -20.92182 G -1.35864 3.16236 -6.94053 -18.95154 14.90774 H 0.44812 -1.05356 3.04836 8.67095 -5.89281 J -0.06388 0.14793 -0.56858 -1.68982 0.99723 Face number S6 S7 S8 S9 S10 k -99.00000 -28.94220 -20.37693 25.26666 -2.24785 A -0.12356 -0.06757 -0.07652 -0.02401 0.04364 B 0.09006 -0.05399 -0.02736 -0.03977 -0.05471 C -0.06528 0.18094 0.11658 0.09110 0.07195 D -0.14638 -0.22792 -0.14182 -0.08719 -0.04545 E 0.16983 0.14817 0.08990 0.04652 0.01642 F 0.13265 -0.05227 -0.03170 -0.01481 -0.00372 G -0.34431 0.00965 0.00617 0.00277 0.00053 H 0.22213 -0.00078 -0.00060 -0.00028 -0.00004 J -0.04745 0.00001 0.00002 0.00001 0.00000

[0137] Table 6

[0138]

[0139]

[0140] In the following, reference will be made to Fig. 9 and Fig.10 An optical imaging system 300 according to a third example is described. Fig. 9 shows an optical imaging system 300 in the YZ direction, Fig.10 The optical imaging system 300 is shown in the XZ direction.

[0141] The optical imaging system 300 may include a first lens 310 , a second lens 320 , a third lens 330 , a fourth lens 340 , a fifth lens 350 , and a sixth lens 360 .

[0142] The first lens 310 may have negative refractive power. The first lens 310 may have a concave object-side surface and a concave image-side surface. An inflection point may be formed on the object-side surface of the first lens 310. The second lens 320 may have positive refractive power. The second lens 320 may have a convex object-side surface and a convex image-side surface. The third lens 330 may have negative refractive power. The third lens 330 may have a convex object-side surface and a concave image-side surface. An inflection point may be formed on the object-side surface and the image-side surface of the third lens 330. The fourth lens 340 may have positive refractive power. The fourth lens 340 may have a concave object-side surface and a convex image-side surface. An inflection point may be formed on the object-side surface and the image-side surface of the fourth lens 340. The fifth lens 350 may have negative refractive power. The fifth lens 350 may have a convex object-side surface and a concave image-side surface. The object-side surface and the image-side surface of the fifth lens 350 may be formed as free-form surfaces. The sixth lens 360 may have negative refractive power. The sixth lens 360 may have a convex object-side surface and a concave image-side surface. Inflection points may be formed on the object-side surface and the image-side surface of the sixth lens 360.

[0143] The optical imaging system 300 may further include an optical filter IF and an image sensor IP.

[0144] The filter IF may be disposed in front of the image sensor IP to block infrared rays, etc. included in the incident light. The image sensor IP may include a plurality of optical sensors. The image sensor IP may be configured to convert an optical signal into an electrical signal.

[0145] Table 7 lists the lens characteristics of the optical imaging system 300 according to the third example, Table 8 lists the aspheric surface values ​​of the optical imaging system 300 according to the third example, and Table 9 lists the X values ​​of the monomial representing the free-form surface of the optical imaging system 300 according to the third example. n Y n Coefficient value. Fig.11 and Fig.12 is a diagram showing aberration curves of the optical imaging system 300 configured as described above.

[0146] Table 7

[0147] Face number mark Radius of curvature Thickness / distance Refractive Index Abbe number Effective radius S1 First lens -9.243 0.509 1.546 55.990 1.927 S2 5.076 1.003 1.245 S3(Aperture) Second lens 4.279 1.298 1.546 55.990 0.710 S4 -1.811 0.050 1.107 S5 The third lens 3.738 0.250 1.677 19.238 1.198 S6 2.145 0.610 1.360 S7 The fourth lens -7.319 0.850 1.546 55.990 1.682 S8 -1.374 0.025 1.779 S9 Fifth lens 1.648 0.362 1.640 23.959 1.960 S10 0.858 0.427 2.660 S11 The sixth lens 1.453 0.425 1.644 23.491 2.796 S12 1.444 0.268 3.032 S13 Optical Filters infinity 0.210 1.518 64.166 3.464 S14 infinity 0.683 3.557 S15 Imaging surface infinity 0.007

[0148] Table 8

[0149]

[0150]

[0151] Table 9

[0152] mark S9 (XY Polynomial) S10 (XY polynomial) k -12.504876240 -3.829676063 <![CDATA[X 4 ]]> 0.027658126 -0.032626007 <![CDATA[X 2 *AND 2 ]]> 0.052044182 -0.071540171 <![CDATA[Y 4 ]]> 0.027567041 -0.029643208 <![CDATA[X 6 ]]> -0.052271480 0.004142788 <![CDATA[X 4 *AND 2 ]]> -0.161078095 0.012336863 <![CDATA[X 2 *AND 4 ]]> -0.154214726 0.016086852 <![CDATA[Y 6 ]]> -0.049972645 0.002049829 <![CDATA[X 8 ]]> 0.013595827 -0.000776936 <![CDATA[X 6 *AND 2 ]]> 0.054637845 -0.003328583 <![CDATA[X 4 *AND 4 ]]> 0.090605903 -0.003014297 <![CDATA[X 2 *AND 6 ]]> 0.048497807 -0.005221393 <![CDATA[Y 8 ]]> 0.011341120 -0.000368805 <![CDATA[X 10 ]]> -0.001372596 0.000048213 <![CDATA[X 8 *AND 2 ]]> -0.006516565 0.000306153 <![CDATA[X 6 *AND 4 ]]> -0.014909373 0.000309113 <![CDATA[X 4 *AND 6 ]]> -0.015142866 0.000412827 <![CDATA[X 2 *AND 8 ]]> -0.004868184 0.000541012 <![CDATA[Y 10 ]]> -0.000820448 0.000038001

[0153] In the following, reference will be made to Fig.13 and Fig.14 An optical imaging system 400 according to a fourth example is described. Fig.13 shows the optical imaging system 400 in the YZ direction, and Fig.14 The optical imaging system 400 is shown in the XZ direction.

[0154] The optical imaging system 400 may include a first lens 410 , a second lens 420 , a third lens 430 , a fourth lens 440 , a fifth lens 450 , and a sixth lens 460 .

[0155] The first lens 410 may have a negative refractive power. The first lens 410 may have a concave object-side surface and a concave image-side surface. An inflection point may be formed on the object-side surface of the first lens 410. The second lens 420 may have a positive refractive power. The second lens 420 may have a convex object-side surface and a concave image-side surface. The third lens 430 may have a positive refractive power. The third lens 430 may have a concave object-side surface and a convex image-side surface. An inflection point may be formed on the object-side surface of the third lens 430. The fourth lens 440 may have a positive refractive power. The fourth lens 440 may have a convex object-side surface and a convex image-side surface. The fifth lens 450 may have a negative refractive power. The fifth lens 450 may have a concave object-side surface and a concave image-side surface. The sixth lens 460 may have a positive refractive power. The sixth lens 460 may have a convex object-side surface and a concave image-side surface. The object-side surface and the image-side surface of the sixth lens 460 may be formed as free-form surfaces.

[0156] The optical imaging system 400 may further include an optical filter IF and an image sensor IP.

[0157] The filter IF may be disposed in front of the image sensor IP to block infrared rays, etc. included in the incident light. The image sensor IP may include a plurality of optical sensors. The image sensor IP may be configured to convert an optical signal into an electrical signal.

[0158] Table 10 lists lens properties of the optical imaging system 400 according to the fourth example, Table 11 lists aspheric surface values ​​of the optical imaging system 400 according to the fourth example, and Table 12 lists X values ​​of monomials representing free-form surfaces of the optical imaging system 400 according to the fourth example. n Y n Coefficient value. Fig.15 and Fig.16 is a diagram showing aberration curves of the optical imaging system 400 configured as described above.

[0159] Table 10

[0160] Face number mark Radius of curvature Thickness / distance Refractive Index Abbe number Effective radius S1 First lens -4.872 0.230 1.546 55.990 1.315 S2 1.986 0.857 0.820 S3(Aperture) Second lens 5.016 0.257 1.656 21.536 0.500 S4 33.124 0.050 0.639 S5 The third lens -3.233 0.518 1.546 55.990 0.710 S6 -1.309 0.050 0.820 S7 The fourth lens 3.929 0.731 1.546 55.990 1.004 S8 -2.203 0.115 1.051 S9 Fifth lens -13.591 0.230 1.677 19.238 1.028 S10 3.008 0.546 1.213 S11 The sixth lens 1.200 0.538 1.546 55.990 1.965 S12 1.715 0.299 2.169 S13 Optical Filters infinity 0.210 1.518 64.166 2.456 S14 infinity 0.670 2.531 S15 Imaging surface infinity 0.020

[0161] Table 11

[0162] Face number S1 S2 S3 S4 S5 k 10.77525 0.34027 -45.58592 -99.00000 -99.00000 A 0.68762 0.75667 -0.15219 -0.06033 -0.17647 B -1.00024 -0.43830 -1.65386 1.39728 3.75727 C 1.11575 7.37345 14.86402 -14.52525 -29.20950 D -0.68563 -80.47275 -116.98965 113.43240 207.92111 E 0.02420 401.59359 599.68773 -511.84949 -911.04749 F 0.31290 -1100.63255 -1994.22257 1311.40562 2327.12719 G -0.23884 1733.79764 3986.02785 -1973.70303 -3452.38248 H 0.07758 -1477.42307 -4037.08918 1707.43924 2782.03821 J -0.00956 530.45287 1359.15586 -688.01032 -947.50452 Face number S6 S7 S8 S9 S10 k 0.15209 -18.90956 2.99636 98.97285 -0.83259 A -0.04275 -0.08843 -0.06148 -0.34839 -0.32761 B -0.00550 0.08249 -0.61209 1.54597 1.17675 C 0.90729 0.31408 3.65520 -4.76873 -1.91106 D 3.50419 -1.23134 -11.30148 10.99266 1.83405 E -44.08067 0.78508 22.05262 -18.52866 -1.16185 F 159.61176 2.97103 -28.16881 20.42944 0.52228 G -279.00346 -6.40154 23.05346 -13.55974 -0.17130 H 243.25479 4.90044 -10.94430 4.83455 0.03710 J -85.35839 -1.35298 2.29068 -0.70042 -0.00379

[0163] Table 12

[0164]

[0165]

[0166] In the following, reference will be made to Fig.17 and Fig.18 An optical imaging system 500 according to a fifth example is described. Fig.17 shows the optical imaging system 500 in the YZ direction, and Fig.18 The optical imaging system 500 is shown in the XZ direction.

[0167] The optical imaging system 500 may include a first lens 510 , a second lens 520 , a third lens 530 , a fourth lens 540 , a fifth lens 550 , and a sixth lens 560 .

[0168] The first lens 510 may have positive refractive power. The first lens 510 may have a convex object side surface and a convex image side surface. The second lens 520 may have negative refractive power. The second lens 520 may have a convex object side surface and a concave image side surface. The third lens 530 may have negative refractive power. The third lens 530 may have a convex object side surface and a concave image side surface. The fourth lens 540 may have negative refractive power. The fourth lens 540 may have a concave object side surface and a concave image side surface. The fifth lens 550 may have negative refractive power. The fifth lens 550 may have a concave object side surface and a concave image side surface. Inflection points may be formed on the object side surface and the image side surface of the fifth lens 550. The sixth lens 560 may have positive refractive power. The sixth lens 560 may have a convex object side surface and a convex image side surface. The object side surface and the image side surface of the sixth lens 560 may be formed as free-form surfaces.

[0169] The optical imaging system 500 may further include an optical filter IF and an image sensor IP.

[0170] The filter IF may be disposed in front of the image sensor IP to block infrared rays, etc. included in the incident light. The image sensor IP may include a plurality of optical sensors. The image sensor IP may be configured to convert an optical signal into an electrical signal.

[0171] Table 13 lists the lens characteristics of the optical imaging system 500 according to the fifth example, Table 14 lists the aspheric surface values ​​of the optical imaging system 500 according to the fifth example, and Table 15 lists the X values ​​of the monomial representing the free-form surface of the optical imaging system 500 according to the fifth example. n Y n Coefficient value. Fig.19 and Fig. 20 is a diagram showing aberration curves of the optical imaging system 500 configured as described above.

[0172] Table 13

[0173]

[0174]

[0175] Table 14

[0176] Face number S1 S2 S3 S4 S5 k -0.14153 0.00000 9.00201 3.33433 99.00000 A -0.01000 -0.00286 -0.06864 -0.10628 -0.08136 B 0.05946 0.09339 0.29637 0.33583 0.79471 C -0.24523 -0.08347 -0.08502 -0.07341 -3.04670 D 0.57313 -0.21002 -1.29325 -1.36767 11.26266 E -0.83226 0.68025 3.68997 3.83960 -30.60010 F 0.75002 -0.89139 -5.20167 -5.41806 53.29985 G -0.40771 0.62344 4.12732 3.95999 -57.44265 H 0.12160 -0.22575 -1.73076 -1.10986 35.60311 J -0.01527 0.03318 0.29674 -0.03420 -9.73514 Face number S6 S7 S8 S9 S10 k 72.21799 98.76403 0.00000 15.35503 -50.97515 A -0.14240 -0.34525 -0.25027 -0.31832 -0.12118 B 1.04699 -0.45482 0.15293 0.25489 0.00882 C -6.56578 5.46841 0.37303 0.05655 0.07284 D 33.86044 -28.04469 -1.52775 -0.63256 -0.14523 E -116.05448 83.99201 2.95954 1.01153 0.13496 F 246.40731 -154.94584 -3.80452 -0.83204 -0.07095 G -316.96444 165.96028 3.64199 0.38087 0.02165 H 227.39595 -89.71745 -2.09454 -0.09105 -0.00361 J -69.85628 16.79435 0.48252 0.00883 0.00025

[0177] Table 15

[0178]

[0179]

[0180] In the following, reference will be made to Fig.21 and Fig. 22An optical imaging system 600 according to a sixth example is described. Fig.21 shows the optical imaging system 600 in the YZ direction, and Fig. 22 The optical imaging system 600 is shown in the XZ direction.

[0181] The optical imaging system 600 may include a first lens 610 , a second lens 620 , a third lens 630 , a fourth lens 640 , a fifth lens 650 , and a sixth lens 660 .

[0182] The first lens 610 may have positive refractive power. The first lens 610 may have a convex object-side surface and a convex image-side surface. The second lens 620 may have negative refractive power. The second lens 620 may have a concave object-side surface and a concave image-side surface. The third lens 630 may have negative refractive power. The third lens 630 may have a convex object-side surface and a concave image-side surface. The fourth lens 640 may have negative refractive power. The fourth lens 640 may have a concave object-side surface and a concave image-side surface. The object-side surface and the image-side surface of the fourth lens 640 may be formed as free-form surfaces. The fifth lens 650 may have negative refractive power. The fifth lens 650 may have a concave object-side surface and a concave image-side surface. Inflection points may be formed on the object-side surface and the image-side surface of the fifth lens 650. The sixth lens 660 may have positive refractive power. The sixth lens 660 may have a convex object-side surface and a convex image-side surface. Inflection points may be formed on the object-side surface of the sixth lens 660.

[0183] The optical imaging system 600 may further include an optical filter IF and an image sensor IP.

[0184] The filter IF may be disposed in front of the image sensor IP to block infrared rays, etc. included in the incident light. The image sensor IP may include a plurality of optical sensors. The image sensor IP may be configured to convert an optical signal into an electrical signal.

[0185] Table 16 lists the lens characteristics of the optical imaging system 600 according to the sixth example, Table 17 lists the aspheric surface values ​​of the optical imaging system 600 according to the sixth example, and Table 18 lists the X values ​​of the monomial representing the free-form surface of the optical imaging system 600 according to the sixth example. n Y n Coefficient value. Fig.23 and Fig.24 is a diagram showing aberration curves of the optical imaging system 600 configured as described above.

[0186] Table 16

[0187] Face number mark Radius of curvature Thickness / distance Refractive Index Abbe number Effective radius S1 First lens 1.539 0.812 1.546 55.990 1.220 S2 -41.226 0.113 1.141 S3(Aperture) Second lens -78.034 0.224 1.668 20.377 1.071 S4 4.927 0.300 0.962 S5 The third lens 33.827 0.285 1.546 55.990 0.892 S6 8.757 0.311 0.810 S7 The fourth lens -47.870 0.301 1.641 23.959 0.825 S8 10.718 1.108 1.014 S9 Fifth lens -6.484 0.220 1.546 55.990 1.457 S10 5.403 0.102 1.736 S11 The sixth lens 10.322 0.685 1.657 21.536 1.969 S12 -44.449 0.050 2.092 S13 Optical Filters infinity 0.110 1.519 64.197 2.382 S14 infinity 0.780 2.407 S15 Imaging surface infinity 0.010

[0188] Table 17

[0189]

[0190]

[0191] Table 18

[0192] mark S7(XY Polynomial) S8(XY Polynomial) k -90.825454010 0.000000000 <![CDATA[X 4 ]]> -0.368603495 -0.249737565 <![CDATA[X 2 *AND 2 ]]> -0.738703108 -0.501124122 <![CDATA[Y 4 ]]> -0.372773121 -0.255694396 <![CDATA[X 6 ]]> 0.136447701 0.177815919 <![CDATA[X 4 *AND 2 ]]> 0.398790120 0.539515778 <![CDATA[X 2 *AND 4 ]]> 0.425483578 0.532498668 <![CDATA[Y 6 ]]> 0.134841284 0.198082327 <![CDATA[X 8 ]]> -0.150768071 -0.145872113 <![CDATA[X 6 *AND 2 ]]> -0.528024353 -0.592926840 <![CDATA[X 4 *AND 4 ]]> -0.860252626 -0.878642471 <![CDATA[X 2 *AND 6 ]]> -0.659911823 -0.578762816 <![CDATA[Y 8 ]]> -0.078587342 -0.166563241 <![CDATA[X 10 ]]> -0.119911776 0.092807453 <![CDATA[X 8 *AND 2 ]]> -0.724974748 0.457834031 <![CDATA[X 6 *AND 4 ]]> -1.336004995 0.958501016 <![CDATA[X 4 *AND 6 ]]> -1.274769066 0.892483796 <![CDATA[X 2 *AND 8 ]]> -0.559594893 0.472748726 <![CDATA[Y 10 ]]> -0.242256911 0.087904185

[0193] Table 19 lists the optical characteristics of the optical imaging systems according to the first example to the sixth example.

[0194] Table 19

[0195]

[0196]

[0197] Table 20 lists the conditional expression values ​​of the optical imaging system according to the first example to the sixth example.

[0198] Table 20

[0199]

[0200] As described above, optical performance can be improved according to the difference in shape and size between the lens and the image sensor.

[0201] Although specific examples have been shown and described above, it will be apparent after understanding the present 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 in this application should be understood in a descriptive sense only, and not for limiting purposes. The description of the features or aspects in each example should be understood to be applicable to similar features or aspects in other examples. If the described techniques are performed in a different order, and / or if the components in the described systems, architectures, devices, or circuits are combined in different ways and / or replaced or supplemented by other components or their equivalents, appropriate results can still be achieved. Therefore, the scope of the present disclosure is not limited by 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 the present disclosure.

Claims

1. An optical imaging system, comprising: A first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially arranged from the object side, wherein, the first lens has a negative refractive power, the second lens has a positive refractive power, the fourth lens has a positive refractive power, the fifth lens has a negative refractive power, and the sixth lens has a positive refractive power, wherein, at least one of the first lens to the sixth lens includes an aspherical surface, wherein, the optical imaging system satisfies the conditional expression: -4.0 < f1 / f2 < -0.1, where f1 is the focal length of the first lens, and f2 is the focal length of the second lens, and wherein, the optical imaging system has a total of six lenses.

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

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

4. The optical imaging system according to claim 1, wherein: The first lens has a concave image side surface.

5. The optical imaging system according to claim 1, wherein: The fifth lens has a concave image side surface.

6. The optical imaging system according to claim 1, wherein: The sixth lens has a concave image side surface.

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

8. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the conditional expression: 0.03 < SAGdifSO / SAGdifSI < 1.2, where SAGdifSO is the deviation between the X-direction SAG and the Y-direction SAG of the object side surface of the lens with a free-form surface, and SAGdifSI is the deviation between the X-direction SAG and the Y-direction SAG of the image side surface of the lens with the free-form surface.

9. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the conditional expression: 0.5 < |f1 / f5| < 2.0, where f5 is the focal length of the fifth lens.

10. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the conditional expression: 0.10 < R10 / R11 < 3.0, where R10 is the radius of curvature of the image side surface of the fifth lens, and R11 is the radius of curvature of the object side surface of the sixth lens.

11. The optical imaging system according to claim 1, wherein: The half field of view (HFOV) of the optical imaging system is 52 degrees to 68 degrees.

12. A camera module, comprising: The optical imaging system according to any one of claims 1 to 11; and An image sensor configured to convert the optical signal of the optical imaging system into an electrical signal.

13. A mobile terminal device, comprising: The camera module according to claim 12.

14. A mobile terminal device, comprising: A plurality of camera modules, wherein, the plurality of camera modules includes one or more camera modules according to claim 12.

Images