Optical image capturing system

Abstract

The optical image capturing system includes: a first lens group including a first lens, a second lens, and a third lens; and a second lens group including a fourth lens, a fifth lens, and a sixth lens, and configured to be movable in an optical axis direction, in which the first lens group and the second lens group are disposed in order from an object side toward an image surface, and in which conditional expressions are satisfied: 1.50 lt; (v1-v2) / (v3-v2) lt; v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, and v3 is the Abbe number of the third lens.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2023-0185910 filed on December 19, 2023, 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 for use in mobile devices. Background Art

[0004] Among various types of cameras used in mobile devices, a telephoto camera having a long focal length may be used to image an object set at a long or medium distance, and a wide-angle camera may be used when acquiring images of an object set at a short or ultra-short distance.

[0005] The telephoto camera used in a general mobile device can be configured to bend the path of incident light using a reflective member provided therein to form a long focal length in a limited space. In this structure, the size (height) of the image sensor may affect the thickness of the mobile device. Although the image sensor can be made smaller by using a relatively small-sized image sensor, the number of pixels in the image sensor may be small, which may be disadvantageous in terms of ensuring resolution. Therefore, it is expected that a large-sized image sensor can be used in the camera of the mobile device and can also be used in the telephoto camera.

[0006] 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. Utility Model Content

[0007] This Summary is provided to introduce a selection of concepts in a concise form, and these concepts will be further described in the Detailed Description below. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

[0008] In one general aspect, an optical imaging system includes: a first lens group including a first lens, a second lens, and a third lens; and a second lens group including a fourth lens, a fifth lens, and a sixth lens and configured to be movable in the optical axis direction, wherein the first lens group and the second lens group are arranged in sequence from the object side toward the image plane, and wherein the conditional expression is satisfied: 1.50 < (v1 - v2) / (v3 - v2) < 2.50, where v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, and v3 is the Abbe number of the third lens.

[0009] The first lens may be formed of a glass material, the first lens may have a positive refractive power, and the second lens may have a negative refractive power.

[0010] The third lens may have a positive refractive power, and both the object side surface and the image side surface of the third lens may be convex.

[0011] The conditional expression may be satisfied: -1.50 < f2 / fG1 < -0.85, where f2 is the focal length of the second lens, and fG1 is the focal length of the first lens group.

[0012] The conditional expression may be satisfied: 0.35 < CT1 / ΣCTG1 ≤ 0.65, where CT1 is the central thickness of the first lens, and ΣCTG1 is the sum of the central thicknesses of the lenses included in the first lens group.

[0013] [[ID=1,5]]The conditional expression may be satisfied: 2.00 < Fno ≤ 2.60, where Fno is the f-number of the optical imaging system.

[0014] The fourth lens may have a negative refractive power and a concave object side surface.

[0015] The fifth lens may have a positive refractive power, and the sixth lens may have a negative refractive power. [[ID=2,2]]

[0016] The conditional expression may be satisfied: 0.30 ≤ v5 / v6 < 1.20, where v5 is the Abbe number of the fifth lens, and v6 is the Abbe number of the sixth lens.

[0017] The conditional expression may be satisfied: 0.35 < EPD / TTL ≤ 0.40, where EPD is the entrance pupil diameter of the optical imaging system, and TTL is the distance on the optical axis from the object side surface of the first lens to the image plane.

[0018] In another general aspect, an optical imaging system includes: a first lens group including a plurality of lenses and fixedly disposed on an optical axis; and a second lens group including a plurality of lenses and configured to be movable in the optical axis direction between the first lens group and an image plane, wherein the first lens group and the second lens group are sequentially arranged from an object side toward the image plane, and wherein the conditional expression 0.35 < EPD / TTL ≤ 0.40 is satisfied, where EPD is the entrance pupil diameter of the optical imaging system, and TTL is the distance on the optical axis from the object side surface of the lens closest to the object side to the image plane.

[0019] The first lens group may have a positive refractive power, and the second lens group may have a negative refractive power.

[0020] The first lens group may include a lens formed of a glass material.

[0021] The conditional expression 0.95 ≤ TTL / f < 1.10 may be satisfied, where f is the focal length of the optical imaging system.

[0022] The conditional expression 0.30 < BFL / f < 0.50 may be satisfied, where BFL is the distance on the optical axis from the image side surface of the lens closest to the image plane to the image plane, and f is the focal length of the optical imaging system.

[0023] The first lens group may include a first lens having a positive refractive power, a second lens having a negative refractive power, and a third lens having a positive refractive power, and the second lens group may include a fourth lens having a negative refractive power, a fifth lens having a positive refractive power, and a sixth lens having a negative refractive power.

[0024] In another general aspect, an optical imaging system includes: a first lens group including a first lens, a second lens, and a third lens; and a second lens group including a fourth lens, a fifth lens, and a sixth lens and configured to be movable in the optical axis direction, wherein the first lens group and the second lens group are sequentially arranged from the object side toward the image plane, and wherein the conditional expressions 0.30 < BFL / f < 0.50 and 2.00 < Fno ≤ 2.60 are satisfied, where BFL is the distance on the optical axis from the image side surface of the sixth lens to the image plane, f is the focal length of the optical imaging system, and Fno is the f-number of the optical imaging system.

[0025] Other features and aspects will be apparent from the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1A is a configuration diagram showing an optical imaging system according to a first embodiment of the present disclosure.

[0027] Figure 1Bis a graph showing aberration characteristics of the optical imaging system according to the first embodiment of the present disclosure.

[0028] Figure 2A is a configuration diagram showing an optical imaging system according to a second embodiment of the present disclosure.

[0029] Figure 2B is a graph showing aberration characteristics of the optical imaging system according to the second embodiment of the present disclosure.

[0030] Figure 3A is a configuration diagram showing an optical imaging system according to a third embodiment of the present disclosure.

[0031] Figure 3B is a graph showing aberration characteristics of the optical imaging system according to the third embodiment of the present disclosure.

[0032] Figure 4A is a configuration diagram showing an optical imaging system according to a fourth embodiment of the present disclosure.

[0033] Figure 4B Graph showing aberration characteristics of the optical imaging system according to the fourth embodiment of the present disclosure.

[0034] Figure 5A is a configuration diagram showing an optical imaging system according to a fifth embodiment of the present disclosure.

[0035] Figure 5B is a graph showing aberration characteristics of an optical imaging system according to a fifth embodiment of the present disclosure.

[0036] Figure 6A is a configuration diagram showing an optical imaging system according to a sixth embodiment of the present disclosure.

[0037] Figure 6B Graph showing aberration characteristics of the optical imaging system according to the sixth embodiment of the present disclosure.

[0038] Figure 7A is a configuration diagram showing an optical imaging system according to a seventh embodiment of the present disclosure.

[0039] Figure 7B Graph showing aberration characteristics of an optical imaging system according to a seventh embodiment of the present disclosure.

[0040] Figure 8A is a configuration diagram showing an optical imaging system according to an eighth embodiment of the present disclosure.

[0041] Figure 8B Graph showing aberration characteristics of the optical imaging system according to the eighth embodiment of the present disclosure.

[0042] Figure 9A is a configuration diagram showing an optical imaging system according to a ninth embodiment of the present disclosure.

[0043] Figure 9B Graph showing aberration characteristics of an optical imaging system according to a ninth embodiment of the present disclosure.

[0044] Figure 10A is a configuration diagram showing an optical imaging system according to a tenth embodiment of the present disclosure.

[0045] Figure 10B Graph showing aberration characteristics of the optical imaging system according to the tenth embodiment of the present disclosure.

[0046] Throughout the drawings and detailed description, unless otherwise described, 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

[0047] 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.

[0048] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices and / or systems described herein. However, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent after understanding the present disclosure. For example, the order of operations described herein is merely an example, and except for operations that must occur in a specific order, it is not limited to the order set forth herein, but can be changed, which will be apparent after understanding the present disclosure. In addition, for the sake of clarity and brevity, descriptions of features that are well known in the art may be omitted.

[0049] The features described herein may be implemented in different 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 possible ways to implement the methods, devices, and / or systems described herein that will be apparent after understanding the present disclosure.

[0050] Throughout the specification, when an element such as a layer, a region, or a 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 one or more other elements may be present between the element and the other element. Conversely, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, there are no other elements between the element and the other element.

[0051] 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" includes any one of the associated listed items and any combination of any two or more items.

[0052] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are used only to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, without departing from the teachings of the examples described herein, a first member, first component, first region, first layer, or first portion mentioned in these examples may also be referred to as a second member, second component, second region, second layer, or second portion.

[0053] Spatially 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 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 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" relative to another element will be "below" or "below" relative to the other element. Thus, the term "above" covers both orientations of "above" and "below," depending on the spatial orientation of the device. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

[0054] The terms used herein are only used to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the terms "a", "an", and "the" are intended to include plural forms as well. The terms "include", "comprising", and "having" indicate the presence of the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0055] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0056] It should be noted that herein, use of the word “may” with respect to an example, for example, regarding what an example may include or implement, means that there is at least one example that includes or implements such feature, and all examples are not limited thereto.

[0057] The features of the examples described herein may be combined in various ways that will be apparent after understanding the present disclosure. In addition, although the examples described herein have various configurations, other configurations that will be apparent after understanding the present disclosure are also possible.

[0058] One aspect of the present disclosure is to provide an optical imaging system that can acquire an image at an ultra-short distance and can ensure uniform resolution regardless of focal length.

[0059] In an embodiment, the units of the values ​​of the radius of curvature, thickness, distance, focal length, 1 / 2 of the diagonal length of the image plane (IMG HT), and half the aperture of the lens may be millimeters (mm), and the unit of the field of view (FOV) may be degrees. In addition, the thickness of the lens and the distance between lenses may refer to the thickness and distance on the optical axis.

[0060] In an embodiment, the object side may indicate a direction in which an object is disposed, and the image side may indicate, for example, a direction in which an image plane on which an image is formed is disposed or a direction in which an image sensor is disposed.

[0061] In the descriptions of lens shapes in the embodiments, a convex surface may mean that the surface's paraxial region (a narrow region near and including the optical axis) is convex, and a concave surface may mean that the surface's paraxial region is concave. Therefore, even when one lens surface is described as convex, the edge of the lens may be concave. Similarly, even when one lens surface is described as concave, the edge of the lens may be convex.

[0062] The optical imaging system according to the embodiment may be used in a camera of a mobile device. For example, the mobile device may be implemented as any type of portable electronic device such as a mobile communication terminal, a smart phone, or a tablet PC.

[0063] According to an embodiment, the optical imaging system may include six 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.

[0064] According to an embodiment, an optical imaging system may include not only a plurality of lenses, but also an image sensor configured to convert incident light into an electrical signal, an infrared cutoff filter configured to block light in an infrared region incident on the image sensor, and an aperture configured to control the amount of incident light.

[0065] In an embodiment, six lenses may be included in the first lens group and the second lens group. For example, the first to third lenses may be included in the first lens group, and the fourth to sixth lenses may be included in the second lens group.

[0066] The first lens group may be configured as a fixed lens group whose position in the optical axis direction is fixed, and the second lens group may be configured as a movable lens group (or focusing lens group) configured to move in the optical axis direction. The second lens group may be movable in the optical axis direction between the first lens group and the image plane. For example, the second lens group may be movable in a direction away from the first lens group.

[0067] In an embodiment, when the second lens group is disposed closest to the first lens group (or disposed at a first position), the optical imaging system can acquire an image of an object disposed at a long distance or an intermediate distance, and when the second lens group is disposed farthest from the first lens group (or disposed at a second position), an image of an object disposed at an ultra-short distance can be acquired.

[0068] Since the first lens group is a fixed lens group and the position of the first lens group relative to the image sensor does not change, the total track length (TTL) of the optical imaging system may be constant even when the second lens group moves.

[0069] In an embodiment, the six lenses may be formed of a glass material or a plastic material. For example, the first lens may be formed of a glass material, and the second to sixth lenses may be formed of a plastic material.

[0070] In embodiments, the six lenses may be spherical or aspherical lenses. For example, at least one of the object-side and image-side surfaces of the first lens may be spherical, and at least one of the object-side and image-side surfaces of each of the second to sixth lenses may be aspherical. The aspherical properties of the lenses can be expressed by Equation 1.

[0071] Equation 1

[0072]

[0073] In Equation 1, c may be the inverse of the radius of curvature of the lens, K may be a conic constant, and Y may be the distance from a point on the aspherical surface of the lens to the optical axis. Furthermore, constants A to H, J, and L to P may be aspherical constants from the 4th to the 30th order, and Z is the distance between a point on the aspherical surface and the vertex of the aspherical surface in the optical axis direction.

[0074] In an embodiment, the optical imaging system may satisfy the following conditional expression.

[0075] Conditional expression 1: 1.50 < (v1 - v2) / (v3 - v2) < 2.50

[0076] Conditional expression 2: 0.30 ≤ v5 / v6 < 1.20

[0077] Conditional expression 3: -1.50 <f2 / fG1<-0.85

[0078] Conditional expression 4: 0.95 ≤ TTL / f < 1.10

[0079] Conditional expression 5: 0.30 <BFL / f<0.50

[0080] Conditional expression 6: 0.35 <EPD / TTL≤0.40

[0081] Conditional Expression 7: 2.00 <Fno≤2.60

[0082] Conditional expression 8: 0.35 <CT1 / ΣCTG1≤0.65

[0083] Conditional Expression 9: 0.50 ≤ SDG2 / IMG HT ≤ 0.8

[0084] Conditional expression 10: 0.20 <StrokeG2 / BFL<0.45

[0085] In Conditional Expression 1, v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, and v3 is the Abbe number of the third lens. Conditional Expression 1 can be related to the lens material arrangement of the first lens group, which can effectively reduce chromatic aberrations in optical imaging systems according to embodiments. In embodiments, by forming the first lens with relatively strong positive refractive power using a low-dispersion material, differences in refractive index across wavelengths can be reduced.

[0086] In Conditional Expression 2, v5 is the Abbe number of the fifth lens element, and v6 is the Abbe number of the sixth lens element. Conditional Expression 2 can be related to the lens material arrangement of the second lens group, which can effectively reduce chromatic aberrations in optical imaging systems according to embodiments. In embodiments, chromatic aberrations can be reduced by sequentially arranging two materials with different dispersion rates.

[0087] In Conditional Expression 3, f2 is the focal length of the second lens, and fG1 is the focal length of the first lens group. Conditional Expression 3 can be related to the lens power arrangement, which can effectively reduce aberrations in the first lens group of an optical imaging system according to an embodiment. In embodiments, by alternating positive and negative refractive power lenses in the first lens group, aberrations in the first lens group can be effectively reduced.

[0088] In Conditional Expression 4, TTL is the distance from the object-side surface of the first lens to the image surface on the optical axis, and f is the focal length of the optical imaging system. Conditional Expression 4 may represent the telephoto ratio of the optical imaging system according to an embodiment, and when the telephoto ratio exceeds the range of the conditional expression (particularly the lower limit), it may be difficult to ensure telephoto performance.

[0089] In Conditional Expression 5, BFL is the distance from the image side surface of the sixth lens to the image plane on the optical axis, and f is the focal length of the optical imaging system. Conditional Expression 5 may be related to the AF stroke amount (range) of the second lens group of the optical imaging system according to the embodiment.

[0090] In Conditional Expression 6, EPD is the entrance pupil diameter of the optical imaging system, and TTL is the distance from the object-side surface of the first lens to the image plane on the optical axis. Conditional Expression 6 may be related to the brightness performance of the optical imaging system according to an embodiment. In embodiments, when EPD is increased compared to TTL, the optical imaging system may have increased brightness.

[0091] In Conditional Expression 7, Fno is an f-value (f-number) of the optical imaging system. Conditional Expression 7 may be related to the brightness performance of the optical imaging system according to the embodiment.

[0092] In Conditional Expression 8, CT1 is the center thickness (thickness on the optical axis) of the first lens, and ΣCTG1 is the sum of the center thicknesses (thickness on the optical axis) of the lenses included in the first lens group. Conditional Expression 8 may be related to the reliability of the lens according to the embodiment, and by increasing the thickness of the first lens formed of a glass material, reliability can be ensured.

[0093] In Conditional Expression 9, SDG2 is the maximum effective diameter of the second lens group, and IMG HT is half the diagonal length of the image sensor. Conditional Expression 9 may be related to the size of the image sensor according to an embodiment. In an embodiment, once the size of the image sensor and the focal length of the optical imaging system are determined, the maximum effective diameter of the second lens group can be determined to satisfy the range of Conditional Expression 9.

[0094] In Conditional Expression 10, StrokeG2 is the maximum amount of movement of the second lens group (infinite focal length minus minimum focal length), and BFL is the distance from the image side surface of the sixth lens to the image plane on the optical axis. Conditional Expression 10 can be correlated with the AF stroke of the telephoto macro camera according to an embodiment, and by determining BFL within the range that satisfies Conditional Expression 10 based on the stroke amount, sufficient actuator space can be ensured.

[0095] Hereinafter, an optical imaging system according to an embodiment may be described with reference to the accompanying drawings.

[0096] First embodiment

[0097] Figure 1A is a diagram showing the configuration of an optical imaging system according to the first embodiment. Figure 1B is a graph showing aberration characteristics of the optical imaging system according to the first embodiment.

[0098] According to the first embodiment, 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, which are arranged in order from the object side, and may further include an infrared cut filter F and an image sensor IP provided on the image side of the sixth lens 160. In addition, the optical imaging system 100 may further include an aperture (not shown) provided on the object side of the third lens 130.

[0099] The first lens 110 may have positive refractive power. The object-side surface of the first lens 110 may be convex in the paraxial region, and the image-side surface of the first lens 110 may be concave in the paraxial region. The first lens 110 may be formed of a (low-dispersion) glass material. Furthermore, the first lens 110 may be a spherical lens. For example, the object-side surface and the image-side surface of the first lens 110 may be spherical.

[0100] The second lens 120 may have negative refractive power. The object-side surface of the second lens 120 may be convex in the paraxial region, and the image-side surface of the second lens 120 may be concave in the paraxial region. The second lens 120 may be formed of a plastic material. Therefore, the second lens 120 may have optical properties that differ from those of the first lens 110 (e.g., a different refractive index and a different Abbe number). In addition, the second lens 120 may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens 120 may be aspherical.

[0101] The third lens 130 may have positive refractive power. Both the object-side surface and the image-side surface of the third lens 130 may be convex in the paraxial region. The third lens 130 may be formed of a plastic material. For example, the third lens 130 may be formed of a plastic material having optical properties different from those of the second lens 120 (e.g., a different refractive index and a different Abbe number), and may be formed of a plastic material having an Abbe number higher than that of the second lens 120. In addition, the third lens 130 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the third lens 130 may be aspherical.

[0102] The fourth lens 140 may have negative refractive power. Both the object-side surface and the image-side surface of the fourth lens 140 may be concave in the paraxial region. The fourth lens 140 may be formed of a plastic material. For example, the fourth lens 140 may be formed of a plastic material having the same or similar optical properties as those of the third lens 130 (e.g., the same or similar refractive index and Abbe number), and may be formed of a plastic material having an Abbe number higher than that of the fifth lens 150. Furthermore, the fourth lens 140 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the fourth lens 140 may be aspherical.

[0103] The fifth lens 150 may have positive refractive power. The object-side surface of the fifth lens 150 may be convex in the paraxial region, and the image-side surface of the fifth lens 150 may be concave in the paraxial region. The fifth lens 150 may be formed of a plastic material. For example, the fifth lens 150 may be formed of a plastic material having optical properties different from those of the fourth lens 140 (e.g., a different refractive index and a different Abbe number). Furthermore, the fifth lens 150 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the fifth lens 150 may be aspherical.

[0104] The sixth lens 160 may have negative refractive power. The object-side surface of the sixth lens 160 may be convex in the paraxial region, and the image-side surface of the sixth lens 160 may be concave in the paraxial region. The sixth lens 160 may be formed of a plastic material. For example, the sixth lens 160 may be formed of a plastic material having optical properties different from those of the fifth lens 150 (e.g., a different refractive index and a different Abbe number). Furthermore, the sixth lens 160 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the sixth lens 160 may be aspherical.

[0105] According to the first embodiment, the optical imaging system 100 may include a first lens group LG1 including a first lens 110, a second lens 120, and a third lens 130, and a second lens group LG2 including a fourth lens 140, a fifth lens 150, and a sixth lens 160. When acquiring an image of an object disposed at an ultra-short distance, the second lens group LG2 may be moved toward an image plane.

[0106] Table 1 below shows optical parameters and physical parameters of the optical imaging system 100 according to the first embodiment.

[0107] Table 1

[0108]

[0109]

[0110] Table 2 below shows aspherical surface data of the optical imaging system 100 according to the first embodiment.

[0111] Table 2

[0112]

[0113]

[0114] Second embodiment

[0115] Figure 2A is a diagram showing the configuration of an optical imaging system according to a second embodiment. Figure 2B is a graph showing aberration characteristics of the optical imaging system according to the second embodiment.

[0116] According to the second embodiment, 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, which are arranged in order from the object side, and may further include an infrared cut filter F and an image sensor IP provided on the image side of the sixth lens 260. In addition, the optical imaging system 200 may further include an aperture (not shown) provided on the object side of the third lens 230.

[0117] The first lens 210 may have positive refractive power. The object-side surface of the first lens 210 may be convex in the paraxial region, and the image-side surface of the first lens 210 may be concave in the paraxial region. The first lens 210 may be formed of a (low-dispersion) glass material. Furthermore, the first lens 210 may be a spherical lens. For example, the object-side surface and the image-side surface of the first lens 210 may be spherical.

[0118] The second lens 220 may have negative refractive power. The object-side surface of the second lens 220 may be convex in the paraxial region, and the image-side surface of the second lens 220 may be concave in the paraxial region. The second lens 220 may be formed of a plastic material. Therefore, the second lens 220 may have optical properties that differ from those of the first lens 210 (e.g., a different refractive index and a different Abbe number). In addition, the second lens 220 may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens 220 may be aspherical.

[0119] The third lens 230 may have positive refractive power. Both the object-side surface and the image-side surface of the third lens 230 may be convex in the paraxial region. The third lens 230 may be formed of a plastic material. For example, the third lens 230 may be formed of a plastic material having optical properties different from those of the second lens 220 (e.g., a different refractive index and a different Abbe number), and may be formed of a plastic material having an Abbe number higher than that of the second lens 220. In addition, the third lens 230 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the third lens 230 may be aspherical.

[0120] The fourth lens 240 may have negative refractive power. The object-side surface of the fourth lens 240 may be concave in the paraxial region, and the image-side surface of the fourth lens 240 may be convex in the paraxial region. The fourth lens 240 may be formed of a plastic material. For example, the fourth lens 240 may be formed of a plastic material having optical properties that are the same or similar to those of the third lens 230 (e.g., the same or similar refractive index and Abbe number), and may be formed of a plastic material having an Abbe number higher than that of the fifth lens 250. In addition, the fourth lens 240 may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens 240 may be aspherical.

[0121] The fifth lens 250 may have positive refractive power. The object-side surface of the fifth lens 250 may be convex in the paraxial region, and the image-side surface of the fifth lens 250 may be concave in the paraxial region. The fifth lens 250 may be formed of a plastic material. For example, the fifth lens 250 may be formed of a plastic material having optical properties different from those of the fourth lens 240 (e.g., a different refractive index and a different Abbe number). In addition, the fifth lens 250 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the fifth lens 250 may be aspherical.

[0122] The sixth lens 260 may have negative refractive power. The object-side surface of the sixth lens 260 may be convex in the paraxial region, and the image-side surface of the sixth lens 260 may be concave in the paraxial region. The sixth lens 260 may be formed of a plastic material. For example, the sixth lens 260 may be formed of a plastic material having optical properties different from those of the fifth lens 250 (e.g., a different refractive index and a different Abbe number). In addition, the sixth lens 260 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the sixth lens 260 may be aspherical.

[0123] According to the second embodiment, the optical imaging system 200 may include a first lens group LG1 including a first lens 210, a second lens 220, and a third lens 230, and a second lens group LG2 including a fourth lens 240, a fifth lens 250, and a sixth lens 260. When acquiring an image of an object disposed at an ultra-short distance, the second lens group LG2 may be moved toward the image plane side.

[0124] Table 3 below shows optical parameters and physical parameters of the optical imaging system 200 according to the second embodiment.

[0125] Table 3

[0126] Face number Radius of curvature Thickness / distance Refractive index Abbe number Half aperture Physical side infinity infinity 1 infinity 0.000 2 7.6910 2.4000 1.4970 81.61 4.40 3 28.8302 2.8903 4.11 4 17.2507 1.2400 1.6144 25.94 3.45 5 5.3830 1.0697 3.30 6 7.8152 2.0000 1.5349 55.74 3.25 7 -12.0673 D1 3.22 8 -6.9357 0.4000 1.5440 55.99 3.25 9 -33.5887 0.3259 3.04 10 6.7952 1.3555 1.6608 20.38 3.25 11 7.7674 1.0310 3.19 12 6.8469 0.6876 1.5349 55.74 3.30 13 5.1558 D2 3.80 14 infinity 0.2100 1.5168 64.20 7.00 15 infinity 1.3224 7.00 Image surface infinity

[0127] Table 4 below shows aspherical surface data of the optical imaging system 200 according to the second embodiment.

[0128] Table 4

[0129]

[0130]

[0131] Third embodiment

[0132] Figure 3A is a diagram showing the configuration of an optical imaging system according to a third embodiment. Figure 3B is a graph showing aberration characteristics of the optical imaging system according to the third embodiment.

[0133] According to the third embodiment, 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, which are arranged in order from the object side. The optical imaging system 300 may also include an infrared cut filter F and an image sensor IP provided on the image side of the sixth lens 360. In addition, the optical imaging system 300 may further include an aperture (not shown) provided on the object side of the third lens 330.

[0134] The first lens 310 may have positive refractive power. The object-side surface of the first lens 310 may be convex in the paraxial region, and the image-side surface of the first lens 310 may be concave in the paraxial region. The first lens 310 may be formed of a (low-dispersion) glass material. Furthermore, the first lens 310 may be a spherical lens. For example, the object-side surface and the image-side surface of the first lens 310 may be spherical.

[0135] The second lens 320 may have negative refractive power. The object-side surface of the second lens 320 may be convex in the paraxial region, and the image-side surface of the second lens 320 may be concave in the paraxial region. The second lens 320 may be formed of a plastic material. Therefore, the second lens 320 may have optical properties that differ from those of the first lens 310 (e.g., a different refractive index and a different Abbe number). In addition, the second lens 320 may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens 320 may be aspherical.

[0136] The third lens 330 may have positive refractive power. Both the object-side surface and the image-side surface of the third lens 330 may be convex in the paraxial region. The third lens 330 may be formed of a plastic material. For example, the third lens 330 may be formed of a plastic material having optical properties different from those of the second lens 320 (e.g., a different refractive index and a different Abbe number), and may be formed of a plastic material having an Abbe number higher than that of the second lens 320. In addition, the third lens 330 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the third lens 330 may be aspherical.

[0137] The fourth lens 340 may have negative refractive power. The object-side surface of the fourth lens 340 may be concave in the paraxial region, and the image-side surface of the fourth lens 340 may be convex in the paraxial region. The fourth lens 340 may be formed of a plastic material. For example, the fourth lens 340 may be formed of a plastic material having the same or similar optical properties as those of the third lens 330 (e.g., the same or similar refractive index and Abbe number), and may be formed of a plastic material having an Abbe number higher than that of the fifth lens 350. In addition, the fourth lens 340 may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens 340 may be aspherical.

[0138] The fifth lens 350 may have positive refractive power. The object-side surface of the fifth lens 350 may be convex in the paraxial region, and the image-side surface of the fifth lens 350 may be concave in the paraxial region. The fifth lens 350 may be formed of a plastic material. For example, the fifth lens 350 may be formed of a plastic material having optical properties different from those of the fourth lens 340 (e.g., a different refractive index and a different Abbe number). In addition, the fifth lens 350 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the fifth lens 350 may be aspherical.

[0139] The sixth lens 360 may have negative refractive power. The object-side surface of the sixth lens 360 may be convex in the paraxial region, and the image-side surface of the sixth lens 360 may be concave in the paraxial region. The sixth lens 360 may be formed of a plastic material. For example, the sixth lens 360 may be formed of a plastic material having optical properties different from those of the fifth lens 350 (e.g., a different refractive index and a different Abbe number). In addition, the sixth lens 360 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the sixth lens 360 may be aspherical.

[0140] According to the third embodiment, the optical imaging system 300 may include a first lens group LG1 including a first lens 310, a second lens 320, and a third lens 330, and a second lens group LG2 including a fourth lens 340, a fifth lens 350, and a sixth lens 360. When acquiring an image of an object disposed at an ultra-short distance, the second lens group LG2 may be moved toward an image plane.

[0141] Table 5 below shows optical parameters and physical parameters of the optical imaging system 300 according to the third embodiment.

[0142] Table 5

[0143]

[0144]

[0145] Table 6 below shows aspherical surface data of the optical imaging system 300 according to the third embodiment.

[0146] Table 6

[0147]

[0148]

[0149] Fourth embodiment

[0150] Figure 4A is a diagram showing the configuration of an optical imaging system according to a fourth embodiment. Figure 4B is a graph showing aberration characteristics of the optical imaging system according to the fourth embodiment.

[0151] According to the fourth embodiment, 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, which are arranged in order from the object side. The optical imaging system 400 may also include an infrared cut filter F and an image sensor IP provided on the image side of the sixth lens 460. In addition, the optical imaging system 400 may further include an aperture (not shown) provided on the object side of the third lens 430.

[0152] The first lens 410 may have positive refractive power. The object-side surface of the first lens 410 may be convex in the paraxial region, and the image-side surface of the first lens 410 may be concave in the paraxial region. The first lens 410 may be formed of a (low-dispersion) glass material. Furthermore, the first lens 410 may be a spherical lens. For example, the object-side surface and the image-side surface of the first lens 410 may be spherical.

[0153] The second lens 420 may have negative refractive power. The object-side surface of the second lens 420 may be convex in the paraxial region, and the image-side surface of the second lens 420 may be concave in the paraxial region. The second lens 420 may be formed of a plastic material. Therefore, the second lens 420 may have optical properties that differ from those of the first lens 410 (e.g., a different refractive index and a different Abbe number). In addition, the second lens 420 may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens 420 may be aspherical.

[0154] The third lens 430 may have positive refractive power. Both the object-side surface and the image-side surface of the third lens 430 may be convex in the paraxial region. The third lens 430 may be formed of a plastic material. For example, the third lens 430 may be formed of a plastic material having optical properties different from those of the second lens 420 (e.g., a different refractive index and a different Abbe number), and may be formed of a plastic material having an Abbe number higher than that of the second lens 420. In addition, the third lens 430 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the third lens 430 may be aspherical.

[0155] The fourth lens 440 may have negative refractive power. The object-side surface of the fourth lens 440 may be concave in the paraxial region, and the image-side surface of the fourth lens 440 may be convex in the paraxial region. The fourth lens 440 may be formed of a plastic material. For example, the fourth lens 440 may be formed of a plastic material having the same or similar optical properties as those of the third lens 430 (e.g., the same or similar refractive index and Abbe number), and may be formed of a plastic material having an Abbe number higher than that of the fifth lens 450. In addition, the fourth lens 440 may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens 440 may be aspherical.

[0156] The fifth lens 450 may have positive refractive power. The object-side surface of the fifth lens 450 may be concave in the paraxial region, and the image-side surface of the fifth lens 450 may be convex in the paraxial region. The fifth lens 450 may be formed of a plastic material. For example, the fifth lens 450 may be formed of a plastic material having optical properties different from those of the fourth lens 440 (e.g., a different refractive index and a different Abbe number). In addition, the fifth lens 450 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the fifth lens 450 may be aspherical.

[0157] The sixth lens element 460 may have negative refractive power. Both the object-side surface and the image-side surface of the sixth lens element 460 may be concave in the paraxial region. The sixth lens element 460 may be formed of a plastic material. For example, the sixth lens element 460 may be formed of a plastic material having optical properties different from those of the fifth lens element 450 (e.g., a different refractive index and a different Abbe number). Furthermore, the sixth lens element 460 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the sixth lens element 460 may be aspherical.

[0158] According to the fourth embodiment, the optical imaging system 400 may include a first lens group LG1 including a first lens 410, a second lens 420, and a third lens 430, and a second lens group LG2 including a fourth lens 440, a fifth lens 450, and a sixth lens 460. When acquiring an image of an object disposed at an ultra-short distance, the second lens group LG2 may be moved toward an image plane.

[0159] Table 7 below shows optical parameters and physical parameters of the optical imaging system 400 according to the fourth embodiment.

[0160] Table 7

[0161]

[0162]

[0163] Table 8 below shows aspherical surface data of the optical imaging system 400 according to the fourth embodiment.

[0164] Table 8

[0165]

[0166]

[0167] Fifth embodiment

[0168] Figure 5A is a diagram showing the configuration of an optical imaging system according to a fifth embodiment. Figure 5B is a graph showing aberration characteristics of the optical imaging system according to the fifth embodiment.

[0169] According to the fifth embodiment, 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, which are arranged in order from the object side, and may further include an infrared cut filter F and an image sensor IP provided on the image side of the sixth lens 560. In addition, the optical imaging system 500 may further include an aperture (not shown) provided on the object side of the third lens 530.

[0170] The first lens 510 may have positive refractive power. The object-side surface of the first lens 510 may be convex in the paraxial region, and the image-side surface of the first lens 510 may be concave in the paraxial region. The first lens 510 may be formed of a (low-dispersion) glass material. Furthermore, the first lens 510 may be a spherical lens. For example, the object-side surface and the image-side surface of the first lens 510 may be spherical.

[0171] The second lens 520 may have negative refractive power. The object-side surface of the second lens 520 may be convex in the paraxial region, and the image-side surface of the second lens 520 may be concave in the paraxial region. The second lens 520 may be formed of a plastic material. Therefore, the second lens 520 may have optical properties that differ from those of the first lens 510 (e.g., a different refractive index and a different Abbe number). In addition, the second lens 520 may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens 520 may be aspherical.

[0172] The third lens 530 may have positive refractive power. Both the object-side surface and the image-side surface of the third lens 530 may be convex in the paraxial region. The third lens 530 may be formed of a plastic material. For example, the third lens 530 may be formed of a plastic material having optical properties different from those of the second lens 520 (e.g., a different refractive index and a different Abbe number), and may be formed of a plastic material having an Abbe number higher than that of the second lens 520. In addition, the third lens 530 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the third lens 530 may be aspherical.

[0173] The fourth lens 540 may have negative refractive power. The object-side surface of the fourth lens 540 may be concave in the paraxial region, and the image-side surface of the fourth lens 540 may be convex in the paraxial region. The fourth lens 540 may be formed of a plastic material. For example, the fourth lens 540 may be formed of a plastic material having the same or similar optical properties as those of the third lens 530 (e.g., the same or similar refractive index and Abbe number), and may be formed of a plastic material having an Abbe number higher than that of the fifth lens 550. In addition, the fourth lens 540 may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens 540 may be aspherical.

[0174] The fifth lens 550 may have positive refractive power. The object-side surface of the fifth lens 550 may be convex in the paraxial region, and the image-side surface of the fifth lens 550 may be concave in the paraxial region. The fifth lens 550 may be formed of a plastic material. For example, the fifth lens 550 may be formed of a plastic material having optical properties different from those of the fourth lens 540 (e.g., a different refractive index and a different Abbe number). In addition, the fifth lens 550 may be an aspherical lens. For example, the object-side surface and the image-side surface of the fifth lens 550 may be aspherical.

[0175] The sixth lens 560 may have negative refractive power. The object-side surface of the sixth lens 560 may be convex in the paraxial region, and the image-side surface of the sixth lens 560 may be concave in the paraxial region. The sixth lens 560 may be formed of a plastic material. For example, the sixth lens 560 may be formed of a plastic material having optical properties different from those of the fifth lens 550 (e.g., a different refractive index and a different Abbe number). In addition, the sixth lens 560 may be an aspherical lens. For example, the object-side surface and the image-side surface of the sixth lens 560 may be aspherical.

[0176] According to the fifth embodiment, the optical imaging system 500 may include a first lens group LG1 including a first lens 510, a second lens 520, and a third lens 530, and a second lens group LG2 including a fourth lens 540, a fifth lens 550, and a sixth lens 560. When acquiring an image of an object disposed at an ultra-short distance, the second lens group LG2 may be moved toward the image plane side.

[0177] Table 9 below shows optical parameters and physical parameters of the optical imaging system 500 according to the fifth embodiment.

[0178] Table 9

[0179]

[0180]

[0181] Table 10 below shows aspherical surface data of the optical imaging system 500 according to the fifth embodiment.

[0182] Table 10

[0183]

[0184]

[0185] Sixth embodiment

[0186] Figure 6A is a diagram showing the configuration of an optical imaging system according to a sixth embodiment. Figure 6B Graphs showing aberration characteristics of the optical imaging system according to the sixth embodiment.

[0187] According to the sixth embodiment, 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, which are arranged in order from the object side, and may further include an infrared cut filter F and an image sensor IP provided on the image side of the sixth lens 660. In addition, the optical imaging system 600 may further include an aperture (not shown) provided on the object side of the third lens 630.

[0188] The first lens 610 may have positive refractive power. The object-side surface of the first lens 610 may be convex in the paraxial region, and the image-side surface of the first lens 610 may be concave in the paraxial region. The first lens 610 may be formed of a (low-dispersion) glass material. In addition, the first lens 610 may be a spherical lens. For example, the object-side surface and the image-side surface of the first lens 610 may be spherical.

[0189] The second lens 620 may have negative refractive power. The object-side surface of the second lens 620 may be convex in the paraxial region, and the image-side surface of the second lens 620 may be concave in the paraxial region. The second lens 620 may be formed of a plastic material. Therefore, the second lens 620 may have optical properties that differ from those of the first lens 610 (e.g., a different refractive index and a different Abbe number). In addition, the second lens 620 may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens 620 may be aspherical.

[0190] The third lens 630 may have positive refractive power. Both the object-side surface and the image-side surface of the third lens 630 may be convex in the paraxial region. The third lens 630 may be formed of a plastic material. For example, the third lens 630 may be formed of a plastic material having optical properties different from those of the second lens 620 (e.g., a different refractive index and a different Abbe number), and may be formed of a plastic material having an Abbe number higher than that of the second lens 620. In addition, the third lens 630 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the third lens 630 may be aspherical.

[0191] The fourth lens 640 may have negative refractive power. The object-side surface of the fourth lens 640 may be concave in the paraxial region, and the image-side surface of the fourth lens 640 may be convex in the paraxial region. The fourth lens 640 may be formed of a plastic material. For example, the fourth lens 640 may be formed of a plastic material having the same or similar optical properties as those of the third lens 630 (e.g., the same or similar refractive index and Abbe number), and may be formed of a plastic material having an Abbe number higher than that of the fifth lens 650. In addition, the fourth lens 640 may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens 640 may be aspherical.

[0192] The fifth lens 650 may have positive refractive power. The object-side surface of the fifth lens 650 may be concave in the paraxial region, and the image-side surface of the fifth lens 650 may be convex in the paraxial region. The fifth lens 650 may be formed of a plastic material. For example, the fifth lens 650 may be formed of a plastic material having optical properties different from those of the fourth lens 640 (e.g., a different refractive index and a different Abbe number). In addition, the fifth lens 650 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the fifth lens 650 may be aspherical.

[0193] The sixth lens 660 may have negative refractive power. The object-side surface of the sixth lens 660 may be convex in the paraxial region, and the image-side surface of the sixth lens 660 may be concave in the paraxial region. The sixth lens 660 may be formed of a plastic material. For example, the sixth lens 660 may be formed of a plastic material having optical properties different from those of the fifth lens 650 (e.g., a different refractive index and a different Abbe number). In addition, the sixth lens 660 may be an aspherical lens. For example, the object-side surface and the image-side surface of the sixth lens 660 may be aspherical.

[0194] According to the sixth embodiment, the optical imaging system 600 may include a first lens group LG1 including a first lens 610, a second lens 620, and a third lens 630, and a second lens group LG2 including a fourth lens 640, a fifth lens 650, and a sixth lens 660. When acquiring an image of an object disposed at an ultra-short distance, the second lens group LG2 may be moved toward the image plane IP side.

[0195] Table 11 below shows optical parameters and physical parameters of the optical imaging system 600 according to the sixth embodiment.

[0196] Table 11

[0197] Face number Radius of curvature Thickness / distance Refractive index Abbe number Half aperture Physical side infinity infinity 1 infinity 0.000 2 6.9226 2.7123 1.4970 81.61 4.45 3 66.7880 1.6429 4.13 4 10.3802 0.6972 1.6144 25.94 3.55 5 5.2090 1.0839 3.35 6 23.4881 1.8000 1.5440 55.99 3.23 7 -11.9605 D1 3.14 8 -3.0022 0.5654 1.5440 55.99 2.80 9 -4.2647 0.5486 2.66 10 -9.1709 0.8358 1.6708 19.24 2.79 11 -5.4460 0.3096 2.91 12 24.1549 1.7406 1.6708 19.24 3.13 13 7.4336 D2 3.43 14 infinity 0.2100 1.5168 64.20 5.01 15 infinity 3.6437 5.04 Image surface infinity

[0198] Table 12 below shows aspherical surface data of the optical imaging system 600 according to the sixth embodiment.

[0199] Table 12

[0200]

[0201]

[0202] Seventh embodiment

[0203] Figure 7A is a diagram showing the configuration of an optical imaging system according to a seventh embodiment. Figure 7B Graphs showing aberration characteristics of the optical imaging system according to the seventh embodiment.

[0204] According to the seventh embodiment, the optical imaging system 700 may include a first lens 710, a second lens 720, a third lens 730, a fourth lens 740, a fifth lens 750, and a sixth lens 760, which are arranged in order from the object side. The optical imaging system 700 may also include an infrared cut filter F and an image sensor IP provided on the image side of the sixth lens 760. In addition, the optical imaging system 700 may further include an aperture (not shown) provided on the object side of the third lens 730.

[0205] The first lens 710 may have positive refractive power. The object-side surface of the first lens 710 may be convex in the paraxial region, and the image-side surface of the first lens 710 may be concave in the paraxial region. The first lens 710 may be formed of a (low-dispersion) glass material. In addition, the first lens 710 may be a spherical lens. For example, the object-side surface and the image-side surface of the first lens 710 may be spherical.

[0206] The second lens 720 may have negative refractive power. The object-side surface of the second lens 720 may be convex in the paraxial region, and the image-side surface of the second lens 720 may be concave in the paraxial region. The second lens 720 may be formed of a plastic material. Therefore, the second lens 720 may have optical properties that differ from those of the first lens 710 (e.g., a different refractive index and a different Abbe number). In addition, the second lens 720 may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens 720 may be aspherical.

[0207] The third lens 730 may have positive refractive power. Both the object-side surface and the image-side surface of the third lens 730 may be convex in the paraxial region. The third lens 730 may be formed of a plastic material. For example, the third lens 730 may be formed of a plastic material having optical properties different from those of the second lens 720 (e.g., a different refractive index and a different Abbe number), and may be formed of a plastic material having an Abbe number higher than that of the second lens 720. In addition, the third lens 730 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the third lens 730 may be aspherical.

[0208] The fourth lens 740 may have negative refractive power. The object-side surface of the fourth lens 740 may be concave in the paraxial region, and the image-side surface of the fourth lens 740 may be convex in the paraxial region. The fourth lens 740 may be formed of a plastic material. For example, the fourth lens 740 may be formed of a plastic material having the same or similar optical properties as those of the third lens 730 (e.g., the same or similar refractive index and Abbe number), and may be formed of a plastic material having an Abbe number higher than that of the fifth lens 750. In addition, the fourth lens 740 may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens 740 may be aspherical.

[0209] The fifth lens 750 may have positive refractive power. The object-side surface of the fifth lens 750 may be convex in the paraxial region, and the image-side surface of the fifth lens 750 may be concave in the paraxial region. The fifth lens 750 may be formed of a plastic material. For example, the fifth lens 750 may be formed of a plastic material having optical properties different from those of the fourth lens 740 (e.g., a different refractive index and a different Abbe number). In addition, the fifth lens 750 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the fifth lens 750 may be aspherical.

[0210] The sixth lens 760 may have negative refractive power. The object-side surface of the sixth lens 760 may be convex in the paraxial region, and the image-side surface of the sixth lens 760 may be concave in the paraxial region. The sixth lens 760 may be formed of a plastic material. For example, the sixth lens 760 may be formed of a plastic material having optical properties different from those of the fifth lens 750 (e.g., a different refractive index and a different Abbe number). In addition, the sixth lens 760 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the sixth lens 760 may be aspherical.

[0211] According to the seventh embodiment, the optical imaging system 700 may include a first lens group LG1 including a first lens 710, a second lens 720, and a third lens 730, and a second lens group LG2 including a fourth lens 740, a fifth lens 750, and a sixth lens 760. When acquiring an image of an object disposed at an ultra-short distance, the second lens group LG2 may be moved toward the image plane IP side.

[0212] Table 13 below shows optical parameters and physical parameters of the optical imaging system 700 according to the seventh embodiment.

[0213] Table 13

[0214]

[0215]

[0216] Table 14 below shows aspherical surface data of the optical imaging system 700 according to the seventh embodiment.

[0217] Table 14

[0218]

[0219]

[0220] Eighth embodiment

[0221] Figure 8A is a diagram showing the configuration of an optical imaging system according to an eighth embodiment. Figure 8B Graphs showing aberration characteristics of the optical imaging system according to the eighth embodiment.

[0222] According to the eighth embodiment, the optical imaging system 800 may include a first lens 810, a second lens 820, a third lens 830, a fourth lens 840, a fifth lens 850, and a sixth lens 860, which are arranged in order from the object side, and may further include an infrared cut filter F and an image sensor IP provided on the image side of the sixth lens 860. In addition, the optical imaging system 800 may further include an aperture (not shown) provided on the object side of the third lens 830.

[0223] The first lens 810 may have positive refractive power. The object-side surface of the first lens 810 may be convex in the paraxial region, and the image-side surface of the first lens 810 may be concave in the paraxial region. The first lens 810 may be formed of a (low-dispersion) glass material. Furthermore, the first lens 810 may be a spherical lens. For example, the object-side surface and the image-side surface of the first lens 810 may be spherical.

[0224] The second lens 820 may have negative refractive power. The object-side surface of the second lens 820 may be convex in the paraxial region, and the image-side surface of the second lens 820 may be concave in the paraxial region. The second lens 820 may be formed of a plastic material. Therefore, the second lens 820 may have optical properties that differ from those of the first lens 810 (e.g., a different refractive index and a different Abbe number). In addition, the second lens 820 may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens 820 may be aspherical.

[0225] The third lens 830 may have positive refractive power. Both the object-side surface and the image-side surface of the third lens 830 may be convex in the paraxial region. The third lens 830 may be formed of a plastic material. For example, the third lens 830 may be formed of a plastic material having optical properties different from those of the second lens 820 (e.g., a different refractive index and a different Abbe number), and may be formed of a plastic material having an Abbe number higher than that of the second lens 820. In addition, the third lens 830 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the third lens 830 may be aspherical.

[0226] The fourth lens 840 may have negative refractive power. The object-side surface of the fourth lens 840 may be concave in the paraxial region, and the image-side surface of the fourth lens 840 may be convex in the paraxial region. The fourth lens 840 may be formed of a plastic material. For example, the fourth lens 840 may be formed of a plastic material having optical properties that are the same or similar to those of the third lens 830 (e.g., the same or similar refractive index and Abbe number), and may be formed of a plastic material having an Abbe number higher than that of the fifth lens 850. In addition, the fourth lens 840 may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens 840 may be aspherical.

[0227] The fifth lens 850 may have positive refractive power. The object-side surface of the fifth lens 850 may be concave in the paraxial region, and the image-side surface of the fifth lens 850 may be convex in the paraxial region. The fifth lens 850 may be formed of a plastic material. For example, the fifth lens 850 may be formed of a plastic material having optical properties different from those of the fourth lens 840 (e.g., a different refractive index and a different Abbe number). In addition, the fifth lens 850 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the fifth lens 850 may be aspherical.

[0228] The sixth lens 860 may have negative refractive power. Both the object-side surface and the image-side surface of the sixth lens 860 may be concave in the paraxial region. The sixth lens 860 may be formed of a plastic material. For example, the sixth lens 860 may be formed of a plastic material having optical properties different from those of the fifth lens 850 (e.g., a different refractive index and a different Abbe number). Furthermore, the sixth lens 860 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the sixth lens 860 may be aspherical.

[0229] According to the eighth embodiment, the optical imaging system 800 may include a first lens group LG1 including a first lens 810, a second lens 820, and a third lens 830, and a second lens group LG2 including a fourth lens 840, a fifth lens 850, and a sixth lens 860. When acquiring an image of an object disposed at an ultra-short distance, the second lens group LG2 may be moved toward the image plane IP side.

[0230] Table 15 below shows optical parameters and physical parameters of the optical imaging system 800 according to the eighth embodiment.

[0231] Table 15

[0232] Face number Radius of curvature Thickness / distance Refractive index Abbe number Half aperture Physical side infinity infinity 1 infinity 0.000 2 7.7589 3.5000 1.4970 81.61 4.45 3 153.7500 1.5758 3.97 4 8.8885 0.7245 1.6144 25.94 3.45 5 4.8285 1.8002 3.28 6 13.2455 1.8000 1.5349 55.74 3.08 7 -14.4217 D1 3.10 8 -4.8673 0.5196 1.5440 55.99 2.98 9 -6.4521 0.7965 2.89 10 -9.7260 1.6138 1.6608 20.38 2.90 11 -4.9168 0.5120 3.10 12 -25.9701 1.0581 1.6144 25.94 3.23 13 6.8141 D2 3.59 14 infinity 0.2100 1.5168 64.20 7.00 15 infinity 1.6790 7.00 Image surface infinity

[0233] Table 16 below shows aspherical surface data of the optical imaging system 800 according to the eighth embodiment.

[0234] Table 16

[0235]

[0236]

[0237] Ninth embodiment

[0238] Figure 9A is a diagram showing the configuration of an optical imaging system according to a ninth embodiment. Figure 9B Graphs showing aberration characteristics of the optical imaging system according to the ninth embodiment.

[0239] According to the ninth embodiment, the optical imaging system 900 may include a first lens 910, a second lens 920, a third lens 930, a fourth lens 940, a fifth lens 950, and a sixth lens 960, which are arranged in order from the object side. The optical imaging system 900 may also include an infrared cut filter F and an image sensor IP provided on the image side of the sixth lens 960. In addition, the optical imaging system 900 may further include an aperture (not shown) provided on the object side of the third lens 930.

[0240] The first lens 910 may have positive refractive power. The object-side surface of the first lens 910 may be convex in the paraxial region, and the image-side surface of the first lens 910 may be concave in the paraxial region. The first lens 910 may be formed of a (low-dispersion) glass material. Furthermore, the first lens 910 may be a spherical lens. For example, the object-side surface and the image-side surface of the first lens 910 may be spherical.

[0241] The second lens 920 may have negative refractive power. The object-side surface of the second lens 920 may be convex in the paraxial region, and the image-side surface of the second lens 920 may be concave in the paraxial region. The second lens 920 may be formed of a plastic material. Therefore, the second lens 920 may have optical properties that differ from those of the first lens 910 (e.g., a different refractive index and a different Abbe number). In addition, the second lens 920 may be an aspherical lens. For example, the object-side surface and the image-side surface of the second lens 920 may be aspherical.

[0242] The third lens 930 may have positive refractive power. Both the object-side surface and the image-side surface of the third lens 930 may be convex in the paraxial region. The third lens 930 may be formed of a plastic material. For example, the third lens 930 may be formed of a plastic material having optical properties different from those of the second lens 920 (e.g., a different refractive index and a different Abbe number), and may be formed of a plastic material having an Abbe number higher than that of the second lens 920. In addition, the third lens 930 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the third lens 930 may be aspherical.

[0243] The fourth lens 940 may have negative refractive power. The object-side surface of the fourth lens 940 may be concave in the paraxial region, and the image-side surface of the fourth lens 940 may be convex in the paraxial region. The fourth lens 940 may be formed of a plastic material. For example, the fourth lens 940 may be formed of a plastic material having the same or similar optical properties as those of the third lens 930 (e.g., the same or similar refractive index and Abbe number), and may be formed of a plastic material having an Abbe number higher than that of the fifth lens 950. In addition, the fourth lens 940 may be an aspherical lens. For example, the object-side surface and the image-side surface of the fourth lens 940 may be aspherical.

[0244] The fifth lens 950 may have positive refractive power. The object-side surface of the fifth lens 950 may be concave in the paraxial region, and the image-side surface of the fifth lens 950 may be convex in the paraxial region. The fifth lens 950 may be formed of a plastic material. For example, the fifth lens 950 may be formed of a plastic material having optical properties different from those of the fourth lens 940 (e.g., a different refractive index and a different Abbe number). In addition, the fifth lens 950 may be an aspherical lens. For example, the object-side surface and the image-side surface of the fifth lens 950 may be aspherical.

[0245] The sixth lens 960 may have negative refractive power. Both the object-side and image-side surfaces of the sixth lens 960 may be concave in the paraxial region. The sixth lens 960 may be formed of a plastic material. For example, the sixth lens 960 may be formed of a plastic material having optical properties different from those of the fifth lens 950 (e.g., a different refractive index and a different Abbe number). Furthermore, the sixth lens 960 may be an aspherical lens. For example, both the object-side and image-side surfaces of the sixth lens 960 may be aspherical.

[0246] According to the ninth embodiment, the optical imaging system 900 may include a first lens group LG1 including a first lens 910, a second lens 920, and a third lens 930, and a second lens group LG2 including a fourth lens 940, a fifth lens 950, and a sixth lens 960. When acquiring an image of an object disposed at an ultra-short distance, the second lens group LG2 may be moved toward the image plane IP side.

[0247] Table 17 below shows optical parameters and physical parameters of the optical imaging system 900 according to the ninth embodiment.

[0248] Table 17

[0249]

[0250]

[0251] Table 18 below shows aspherical surface data of the optical imaging system 900 according to the ninth embodiment.

[0252] Table 18

[0253]

[0254]

[0255] Tenth embodiment

[0256] Figure 10A is a diagram showing the configuration of an optical imaging system according to a tenth embodiment. Figure 10B Graphs showing aberration characteristics of the optical imaging system according to the tenth embodiment.

[0257] According to the tenth embodiment, the optical imaging system 1000 may include a first lens 1010, a second lens 1020, a third lens 1030, a fourth lens 1040, a fifth lens 1050, and a sixth lens 1060, which are arranged in order from the object side. The optical imaging system 1000 may also include an infrared cut filter F and an image sensor IP provided on the image side of the sixth lens 1060. In addition, the optical imaging system 1000 may further include an aperture (not shown) provided on the object side of the third lens 1030.

[0258] The first lens 1010 may have positive refractive power. The object-side surface of the first lens 1010 may be convex in the paraxial region, and the image-side surface of the first lens 1010 may be concave in the paraxial region. The first lens 1010 may be formed of a (low-dispersion) glass material. Furthermore, the first lens 1010 may be a spherical lens. For example, the object-side surface and the image-side surface of the first lens 1010 may be spherical.

[0259] The second lens 1020 may have negative refractive power. The object-side surface of the second lens 1020 may be convex in the paraxial region, and the image-side surface of the second lens 1020 may be concave in the paraxial region. The second lens 1020 may be formed of a plastic material. Therefore, the second lens 1020 may have optical properties that differ from those of the first lens 1010 (e.g., a different refractive index and a different Abbe number). In addition, the second lens 1020 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the second lens 1020 may be aspherical.

[0260] The third lens 1030 may have positive refractive power. Both the object-side surface and the image-side surface of the third lens 1030 may be convex in the paraxial region. The third lens 1030 may be formed of a plastic material. For example, the third lens 1030 may be formed of a plastic material having optical properties different from those of the second lens 1020 (e.g., a different refractive index and a different Abbe number), and may be formed of a plastic material having an Abbe number higher than that of the second lens 1020. In addition, the third lens 1030 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the third lens 1030 may be aspherical.

[0261] The fourth lens 1040 may have negative refractive power. The object-side surface of the fourth lens 1040 may be concave in the paraxial region, and the image-side surface of the fourth lens 1040 may be convex in the paraxial region. The fourth lens 1040 may be formed of a plastic material. For example, the fourth lens 1040 may be formed of a plastic material having the same or similar optical properties as those of the third lens 1030 (e.g., the same or similar refractive index and Abbe number), and may be formed of a plastic material having an Abbe number higher than that of the fifth lens 1050. Furthermore, the fourth lens 1040 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the fourth lens 1040 may be aspherical.

[0262] The fifth lens 1050 may have positive refractive power. The object-side surface of the fifth lens 1050 may be convex in the paraxial region, and the image-side surface of the fifth lens 1050 may be concave in the paraxial region. The fifth lens 1050 may be formed of a plastic material. For example, the fifth lens 1050 may be formed of a plastic material having optical properties different from those of the fourth lens 1040 (e.g., a different refractive index and a different Abbe number). In addition, the fifth lens 1050 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the fifth lens 1050 may be aspherical.

[0263] The sixth lens 1060 may have negative refractive power. The object-side surface of the sixth lens 1060 may be convex in the paraxial region, and the image-side surface of the sixth lens 1060 may be concave in the paraxial region. The sixth lens 1060 may be formed of a plastic material. For example, the sixth lens 1060 may be formed of a plastic material having optical properties different from those of the fifth lens 1050 (e.g., a different refractive index and a different Abbe number). In addition, the sixth lens 1060 may be an aspherical lens. For example, both the object-side surface and the image-side surface of the sixth lens 1060 may be aspherical.

[0264] According to the tenth embodiment, the optical imaging system 1000 may include a first lens group LG1 including a first lens 1010, a second lens 1020, and a third lens 1030, and a second lens group LG2 including a fourth lens 1040, a fifth lens 1050, and a sixth lens 1060. When acquiring an image of an object disposed at an ultra-short distance, the second lens group LG2 may be moved toward the image plane IP side.

[0265] Table 19 below shows optical parameters and physical parameters of the optical imaging system 1000 according to the tenth embodiment.

[0266] Table 19

[0267] Face number Radius of curvature Thickness / distance Refractive index Abbe number Half aperture Physical side infinity infinity 1 infinity 0.000 2 7.6718 3.3504 1.4970 81.61 4.40 3 40.2665 1.5979 3.92 4 13.8055 1.1497 1.6144 25.94 3.52 5 5.2969 1.3020 3.33 6 9.9966 2.0000 1.5349 55.74 3.24 7 -11.7696 D1 3.20 8 -6.6571 0.5786 1.5440 55.99 3.23 9 -16.4245 0.0802 3.15 10 7.1961 0.7307 1.6608 20.38 3.18 11 8.2672 1.1646 3.16 12 12.4860 1.1959 1.5349 55.74 3.22 13 6.7713 D2 3.85 14 infinity 0.2100 1.5168 64.20 7.00 15 infinity 2.0526 7.00 Image surface infinity

[0268] Table 20 below shows aspherical surface data of the optical imaging system 1000 according to the tenth embodiment.

[0269] Table 20

[0270]

[0271]

[0272] Table 21 below shows distance changes (AF strokes) during focusing of the optical imaging system according to the embodiment.

[0273] Table 21

[0274]

[0275]

[0276] Table 22 below shows optical parameters and physical parameters related to the focal length and conditional expressions of the optical imaging system according to the embodiment.

[0277] Table 22

[0278]

[0279]

[0280] The optical imaging system according to the above-described embodiment can be made smaller compared to the size of an image sensor.

[0281] According to the above embodiments, the optical imaging system can acquire images at an ultra-short distance and can ensure uniform resolution regardless of the focal length.

[0282] Although specific examples have been shown and described above, it will be apparent after 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 are to be understood in a descriptive sense only and not for purposes of limitation. The description of features or aspects in each example should be considered applicable to similar features or aspects in other examples. Appropriate results may still be achieved if the described techniques are performed in a different order, and / or if components in the described systems, architectures, devices, or circuits are combined in different ways and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of this disclosure is not limited by the specific embodiments, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in this disclosure.

Claims

1. An optical imaging system, characterized in that The optical imaging system comprises: a first lens group including a first lens, a second lens, and a third lens; and The second lens group includes a fourth lens, a fifth lens, and a sixth lens, and is configured to be movable in the optical axis direction. The first lens group and the second lens group are sequentially arranged from the object side toward the image plane, and Among them, the conditional expression is satisfied: 1.50<(v1-v2) / (v3-v2)<2.50, Wherein, v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, and v3 is the Abbe number of the third lens.

2. The optical imaging system according to claim 1, It is characterized by: The first lens is formed of glass material, wherein the first lens has positive refractive power, and Wherein, the second lens has negative refractive power.

3. The optical imaging system according to claim 1, wherein: The third lens has positive refractive power, and Wherein, the object-side surface and the image-side surface of the third lens are both convex.

4. The optical imaging system according to claim 1, wherein: Satisfies the conditional expression: -1.50 <f2 / fG1<-0.85, Wherein, f2 is the focal length of the second lens, and fG1 is the focal length of the first lens group.

5. The optical imaging system according to claim 1, wherein: Satisfies the conditional expression: 0.35 <CT1 / ΣCTG1≤0.65, Here, CT1 is the center thickness of the first lens, and ΣCTG1 is the sum of the center thicknesses of lenses included in the first lens group.

6. The optical imaging system according to claim 1, wherein: Conditional expression: 2.00 <Fno≤2.60, Wherein, Fno is the f-value of the optical imaging system.

7. The optical imaging system according to claim 1, wherein: The fourth lens element has negative refractive power and a concave object-side surface.

8. The optical imaging system according to claim 1, wherein: The fifth lens has positive refractive power, and Wherein, the sixth lens has negative refractive power.

9. The optical imaging system according to claim 1, wherein: Satisfy the conditional expression: 0.30≤v5 / v6<1.20, Wherein, v5 is the Abbe number of the fifth lens, and v6 is the Abbe number of the sixth lens.

10. The optical imaging system according to claim 1, wherein: Satisfies the conditional expression: 0.35 <EPD / TTL≤0.40, Wherein, EPD is the entrance pupil diameter of the optical imaging system, and TTL is the distance from the object side surface of the first lens to the image plane on the optical axis.

11. An optical imaging system, characterized in that The optical imaging system comprises: a first lens group including a plurality of lenses and fixedly disposed on the optical axis; and a second lens group including a plurality of lenses and configured to be movable between the first lens group and the image plane in the optical axis direction; wherein the first lens group and the second lens group are arranged in sequence from the object side toward the image plane, and Among them, the conditional expression is satisfied: 0.35 <EPD / TTL≤0.40, Wherein, EPD is an entrance pupil diameter of the optical imaging system, and TTL is a distance from the object side surface of the lens disposed closest to the object side to the image plane on the optical axis.

12. The optical imaging system according to claim 11, wherein: The first lens group has positive refractive power, and Wherein, the second lens group has negative refractive power.

13. The optical imaging system according to claim 11, wherein: The first lens group includes lenses formed of a glass material.

14. The optical imaging system according to claim 11, wherein: Satisfy the conditional expression: 0.95≤TTL / f<1.10, Wherein, f is the focal length of the optical imaging system.

15. The optical imaging system according to claim 11, wherein: Satisfy the conditional expression: 0.30 <BFL / f<0.50, Here, BFL is the distance from the image side of the lens closest to the image plane on the optical axis, and f is the focal length of the optical imaging system.

16. The optical imaging system according to claim 11, It is characterized by: The first lens group includes a first lens with positive refractive power, a second lens with negative refractive power, and a third lens with positive refractive power, and wherein, the second lens group includes a fourth lens with negative refractive power, a fifth lens with positive refractive power, and a sixth lens with negative refractive power.

17. An optical imaging system, characterized in that The optical imaging system includes: A first lens group including a first lens, a second lens, and a third lens; and A second lens group including a fourth lens, a fifth lens, and a sixth lens, and configured to be movable in the optical axis direction, wherein, the first lens group and the second lens group are arranged in sequence from the object side towards the image plane, and wherein, the conditional expression is satisfied: 0.30 < BFL / f < 0.50 and 2.00 < Fno ≤ 2.60, where BFL is the distance from the image side of the sixth lens to the image plane on the optical axis, f is the focal length of the optical imaging system, and Fno is the f-number of the optical imaging system.

18. The optical imaging system according to claim 17, It is characterized by: The conditional expression is satisfied: -1.50 < f2 / fG1 < -0.85, where f2 is the focal length of the second lens, and fG1 is the focal length of the first lens group.

Images