Imaging lens system

Abstract

The imaging lens system includes: a first lens group including one or more lenses and an optical path converter; and a second lens group including one or more lenses and configured to be movable in an optical axis direction, in which the first lens group and the second lens group are sequentially disposed along an optical axis of the imaging lens system from an object side of the imaging lens system toward an imaging plane of the imaging lens system, and the imaging lens system satisfies a conditional expression 1.50 < = fPF / fPR < = 6.50, fPF is a focal length of a front lens of the first lens group disposed closest to an object side of the optical path converter, and fPR is a focal length of a rear lens of the first lens group disposed closest to an image side of the optical path converter.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2023-0186290, filed on December 19, 2023, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. Technical Field

[0003] This disclosure relates to an imaging lens system configured to minimize resolution reduction due to changes in viewing angle. Background Technology

[0004] Portable electronic devices include camera modules for capturing still or moving images. For example, a camera module can be mounted on a mobile phone, laptop computer, game console, or other portable electronic device. Such portable electronic devices are typically manufactured in a compact or small size to increase user convenience in terms of device portability. For example, a telephoto camera module mounted on a portable electronic device is configured to have an imaging lens system including an optical path converter. The camera module can be configured to produce images of constant quality regardless of the user's environment. For example, the camera module may include image stabilization functionality. However, because image stabilization is performed by driving the entire imaging lens system or some lenses of the imaging lens system in a direction intersecting the optical axis, it may alter the viewing angle of the telephoto camera module or reduce its resolution. Utility Model Content

[0005] This summary portion is provided to briefly introduce the selection of concepts, which will be further described in the detailed description portion below. This summary portion is not intended to identify key or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

[0006] In one general aspect, the imaging lens system includes: a first lens group comprising one or more lenses and an optical path converter; and a second lens group comprising one or more lenses and configured to be movable in the optical axis direction, wherein the first lens group and the second lens group are sequentially arranged along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system, and the imaging lens system satisfies the conditional expression 1.50≤fPF / fPR≤6.50, wherein fPF is the focal length of the front lens of the first lens group disposed on the object side closest to the optical path converter, and fPR is the focal length of the rear lens of the first lens group disposed on the image side closest to the optical path converter.

[0007] The front lens of the first lens group may have a convex object side surface in its paraxial region.

[0008] The rear lens of the first lens group may have a convex image side surface in its paraxial region.

[0009] The foremost lens disposed on the image side of the second lens group closest to the rear lens of the first lens group may have a convex image side surface in its paraxial region.

[0010] The rearmost lens of the second lens group closest to the imaging surface may have a concave object side surface in its paraxial region.

[0011] The rearmost lens of the second lens group closest to the imaging surface may have a concave image side surface in its paraxial region.

[0012] The optical path converter may include a reflective surface, and the imaging lens system may further satisfy the conditional expression 0.050 ≤ ML / R1 ≤ 0.60, where ML is the distance along the optical axis from the reflective surface of the optical path converter to the image side surface of the rear lens of the first lens group, and R1 is the radius of curvature of the object side surface of the front lens of the first lens group.

[0013] The optical path converter may include a reflective surface, and the imaging lens system may further satisfy the conditional expression 0.2 ≤ |ML / R4| ≤ 1.0, where ML is the distance along the optical axis from the reflective surface of the optical path converter to the image side surface of the rear lens of the first lens group, and R4 is the radius of curvature of the image side surface of the rear lens of the first lens group.

[0014] In another general aspect, the imaging lens system includes a first lens, an optical path converter, a second lens having a convex image side surface in its paraxial region, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially disposed along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system, where the imaging lens system satisfies the conditional expression 1.60 < f1 / f < 3.60, where f is the focal length of the imaging lens system when the imaging lens system is focused on an object at infinity, and f1 is the focal length of the first lens.

[0015] The first lens may have a convex object side surface in its paraxial region.

[0016] The first lens may have a concave image side surface in its paraxial region.

[0017] The second lens may have a flat object side surface that engages with the image side surface of the optical path converter.

[0018] The third lens may have a convex image side surface in its paraxial region.

[0019] The fourth lens may have a concave object-side surface in its paraxial region.

[0020] The fourth lens may have a concave image-side surface in its paraxial region.

[0021] The fifth lens may have a convex object-side surface in its paraxial region.

[0022] In another general aspect, the imaging lens system includes: a first lens having positive refractive power and a convex object-side surface in its paraxial region; a light path converter; a second lens having positive refractive power and a convex image-side surface in its paraxial region; a third lens having refractive power and a concave object-side surface in its paraxial region; a fourth lens having refractive power; a fifth lens having refractive power; and a sixth lens having refractive power and a concave image-side surface in its paraxial region, wherein the first lens, light path converter, second lens, third lens, fourth lens, fifth lens, and sixth lens are sequentially arranged along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system, and each of the first to sixth lenses has... A lens having a single refractive index and refractive power in an imaging lens system, with third to sixth lenses spaced apart from each other along the optical axis, a first lens, an optical path converter, and a second lens included in a first lens group, and third to sixth lenses included in a second lens group configured to be movable along the optical axis to adjust the focal point of the imaging lens system, or third and fourth lenses included in a second lens group configured to be movable along the optical axis to adjust the focal point of the imaging lens system and fifth and sixth lenses included in a third lens group, or third and fourth lenses included in a second lens group and fifth and sixth lenses included in a third lens group configured to be movable along the optical axis to adjust the focal point of the imaging lens system.

[0023] The second lens may have a flat object side that engages with the image side of the optical path converter.

[0024] The first lens group can be configured to rotate about an axis perpendicular to the optical axis to perform image stabilization.

[0025] The optical path converter may include a reflective surface, and the imaging lens system may satisfy the conditional expression 1.0≤G1L / Dp≤4.0, where G1L is the distance along the optical axis from the object side of the first lens to the image side of the second lens, and Dp is the diagonal length of the reflective surface of the optical path converter.

[0026] The imaging lens system can satisfy the following expression: 1.50 ≤ fPF / fPR ≤ 6.50, where fPF is the focal length of the first lens and fPR is the focal length of the second lens.

[0027] The imaging lens system can satisfy the following expression: 1.60 < f1 / f < 3.60, where f is the focal length of the imaging lens system when the imaging lens system is focused on an object at infinity, and f1 is the focal length of the first lens.

[0028] In another general aspect, the imaging lens system can include: a first lens having a positive refractive power and a convex object side surface in its paraxial region; an optical path converter; a second lens having a positive refractive power and a convex image side surface in its paraxial region; a third lens having a refractive power and a convex object side surface in its paraxial region; a fourth lens having a refractive power; a fifth lens having a refractive power; a sixth lens having a refractive power; and a seventh lens having a refractive power and a concave image side surface in its paraxial region, wherein the first lens, the optical path converter, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are sequentially arranged along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. The first lens to the seventh lens each have a single refractive index and are lenses having refractive power in the imaging lens system. The third lens to the seventh lens are spaced apart from each other along the optical axis. The first lens, the optical path converter, and the second lens are included in the first lens group, and the third lens to the seventh lens are included in the second lens group, and the second lens group is configured to be movable along the optical axis to adjust the focus of the imaging lens system.

[0029] The second lens can have a flat object side surface that engages with the image side surface of the optical path converter.

[0030] The first lens group can be configured to be rotatable about an axis perpendicular to the optical axis to perform image stabilization.

[0031] The optical path converter can include a reflective surface, and the imaging lens system can satisfy the conditional expression 1.0 ≤ G1L / Dp ≤ 4.0, where G1L is the distance along the optical axis from the object side surface of the first lens to the image side surface of the second lens, and Dp is the diagonal length of the reflective surface of the optical path converter.

[0032] The imaging lens system can satisfy the conditional expression 1.50 ≤ fPF / fPR ≤ 6.50, where fPF is the focal length of the first lens, and fPR is the focal length of the second lens.

[0033] The imaging lens system can satisfy the conditional expression 1.60 < f1 / f < 3.60, where f is the focal length of the imaging lens system when the imaging lens system is focused on an object at infinity, and f1 is the focal length of the first lens.

[0034] Other features and aspects will be apparent from the accompanying drawings and the following detailed description. Description of the Drawings

[0035] Figure 1 and Figure 2 This is a configuration diagram of an imaging lens system according to a first embodiment of the present disclosure.

[0036] Figure 3 It shows Figure 1 The aberration characteristics of the imaging lens system shown.

[0037] Figure 4 and Figure 5 This is a configuration diagram of an imaging lens system according to a second embodiment of the present disclosure.

[0038] Figure 6 It shows Figure 4 The aberration characteristics of the imaging lens system shown.

[0039] Figure 7 and Figure 8 This is a configuration diagram of an imaging lens system according to a third embodiment of the present disclosure.

[0040] Figure 9 It shows Figure 7 The aberration characteristics of the imaging lens system shown.

[0041] Figure 10 and Figure 11 This is a configuration diagram of an imaging lens system according to the fourth embodiment of this disclosure.

[0042] Figure 12 It shows Figure 10 The aberration characteristics of the imaging lens system shown.

[0043] Figure 13 and Figure 14 This is a configuration diagram of an imaging lens system according to the fifth embodiment of this disclosure.

[0044] Figure 15 It shows Figure 13 The aberration characteristics of the imaging lens system shown.

[0045] Throughout the accompanying drawings and detailed embodiments, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative dimensions, scale, and depiction of elements in the drawings may be exaggerated. Detailed Implementation

[0046] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein, except for operations that must occur in a specific order, as will become apparent upon understanding the disclosure of this application. Furthermore, for clarity and conciseness, descriptions of features well-known in the art may be omitted.

[0047] The features described herein may be implemented in various forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein are provided merely to illustrate some of the many possible ways in which the methods, apparatuses, and / or systems described herein will become apparent upon understanding the disclosure of this application.

[0048] Throughout this specification, when an element such as a layer, region, or substrate is described as being "on," "connected to," or "attached to" another element, the element may be directly "on," directly "connected to," or directly "attached to" the other element, or there may be one or more other elements between the element and the other element. Conversely, when an element is described as being "directly on," "directly connected to," or "directly attached to" another element, there are no other elements between the element and the other element.

[0049] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more items.

[0050] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited by these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or section from another. Therefore, without departing from the teachings of the examples described herein, the first component, first part, first region, first layer, or first section mentioned in these examples may also be referred to as a second component, second part, second region, second layer, or second section.

[0051] Spatial relative terms such as “above,” “above,” “below,” and “under” may be used herein for descriptive convenience to describe the relationship of one element relative to another, as shown in the accompanying drawings. In addition to covering the orientation depicted in the drawings, these spatial relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “above” another element would be located “below” or “under” that other element. Thus, depending on the spatial orientation of the device, the term “above” covers both orientations of “above” and “below”. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0052] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the terms “a,” “an,” and “the” are intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the stated features, 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.

[0053] exist Figures 1 to 2 , Figures 4 to 5 , Figures 7 to 8 , Figures 10 to 11 and Figures 13 to 14 In the configuration diagrams, the thickness, size, and shape of the lenses may be slightly exaggerated for illustrative purposes. Furthermore, the spherical or aspherical shapes shown in the configuration diagrams are merely examples and are not limited to these shapes.

[0054] In this specification, the foremost lens or first lens refers to the lens closest to the object (or subject), and the last lens or final lens refers to the lens closest to the imaging plane (or image sensor). In this specification, the units for radius of curvature, thickness, distance, TTL (distance from the object-side surface of the first lens to the imaging plane), ImgH (or Y, the height of the imaging plane), and focal length are millimeters (mm).

[0055] The thickness of the lens, the gap between the lenses, and the TTL are measured along the optical axis.

[0056] Unless otherwise stated, references to the shape of a lens surface refer to the shape of the paraxial region of the lens surface. The paraxial region of a lens surface is the central portion of the lens surface surrounding and including 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 approximations sinθ≈θ, tanθ≈θ, and cosθ≈1 are valid.

[0057] For example, the statement that the object-side surface of a lens is convex means that at least the paraxial region of the object-side surface of the lens is convex, and the statement that the image-side surface of a lens is concave means that at least the paraxial region of the image-side surface of the lens is concave. Therefore, even if the object-side surface of a lens can be described as convex, the entire object-side surface of the lens may not be convex, and the peripheral region of the object-side surface of the lens may be concave. Furthermore, even if the image-side surface of a lens can be described as concave, the entire image-side surface of the lens may not be concave, and the peripheral region of the image-side surface of the lens may be convex.

[0058] An imaging lens system according to a first embodiment of the present disclosure may include two lens groups. For example, an imaging lens system according to the first embodiment may include a first lens group and a second lens group arranged sequentially along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. Furthermore, the number of lens groups constituting the imaging lens system according to the first embodiment may not be limited to two. For example, an imaging lens system according to the first embodiment may further include a third lens group disposed on the image side of the second lens group. An imaging lens system according to the first embodiment may include an optical path converter. For example, in an imaging lens system according to the first embodiment, the first lens group may include an optical path converter. An imaging lens system according to the first embodiment may include a lens group movable in the optical axis direction. For example, in an imaging lens system according to the first embodiment, the second lens group may be configured to be movable in the optical axis direction. An imaging lens system according to the first embodiment may satisfy a specific conditional expression. For example, an imaging lens system according to the first embodiment may satisfy the conditional expression 1.50 ≤ fPF / fPR ≤ 6.5, where fPF is the focal length of the front lens disposed on the object side closest to the optical path converter, and fPR is the focal length of the rear lens disposed on the image side closest to the optical path converter.

[0059] The imaging lens system according to the first embodiment may include one or more features listed below as needed.

[0060] For example, in the imaging lens system according to the first embodiment, the front lens disposed closest to the object side of the optical path converter may have a convex object side in its paraxial region.

[0061] As another example, in the imaging lens system according to the first embodiment, the rear lens disposed on the image side closest to the optical path converter may have a convex image side in its paraxial region.

[0062] As another example, in the imaging lens system according to the first embodiment, the lens disposed on the image side closest to the rear lens may have a convex image side in its paraxial region, wherein the rear lens is disposed on the image side closest to the optical path converter.

[0063] As another example, in the imaging lens system according to the first embodiment, the last lens, which is positioned closest to the imaging surface, may have a concave object side in its paraxial region.

[0064] As another example, in the imaging lens system according to the first embodiment, the last lens, which is positioned closest to the imaging plane, may have a concave image-side surface in its paraxial region.

[0065] An imaging lens system according to a second embodiment of the present disclosure may include two lens groups. For example, an imaging lens system according to a second embodiment may include a first lens group and a second lens group arranged sequentially along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. However, the number of lens groups constituting the imaging lens system according to the second embodiment may not be limited to two. For example, an imaging lens system according to a second embodiment may further include a third lens group disposed on the image side of the second lens group. An imaging lens system according to a second embodiment may include an optical path converter. For example, in an imaging lens system according to a second embodiment, the first lens group may include an optical path converter. An imaging lens system according to a second embodiment may include a lens group movable in the optical axis direction. For example, in an imaging lens system according to a second embodiment, the second lens group may be configured to be movable in the optical axis direction. An imaging lens system according to a second embodiment may be configured with a predetermined number of lenses. For example, in an imaging lens system according to a second embodiment, seven lenses constituting the first lens group and the second lens group may be provided.

[0066] An imaging lens system according to a third embodiment of the present disclosure may include two lens groups. For example, an imaging lens system according to a third embodiment may include a first lens group and a second lens group arranged sequentially along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. However, the number of lens groups in an imaging lens system according to a third embodiment may not be limited to two. For example, an imaging lens system according to a third embodiment may further include a third lens group disposed on the image side of the second lens group. An imaging lens system according to a third embodiment may include an optical path converter. For example, in an imaging lens system according to a third embodiment, the first lens group may include an optical path converter. An imaging lens system according to a third embodiment may include a lens group movable in the optical axis direction. For example, in an imaging lens system according to a third embodiment, the second lens group may be configured to be movable in the optical axis direction. An imaging lens system according to a third embodiment may include multiple lenses having positive refractive power. For example, in an imaging lens system according to a third embodiment, both the front lens disposed closest to the object side of the optical path converter and the rear lens disposed closest to the image side of the optical path converter may have positive refractive power.

[0067] An imaging lens system according to a fourth embodiment of the present disclosure may include two lens groups. For example, an imaging lens system according to a fourth embodiment may include a first lens group and a second lens group arranged sequentially along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. However, the number of lens groups constituting the imaging lens system according to the fourth embodiment may not be limited to two. As an example, an imaging lens system according to a fourth embodiment may also include a third lens group disposed on the image side of the second lens group. An imaging lens system according to a fourth embodiment may include an optical path converter. For example, in an imaging lens system according to a fourth embodiment, the first lens group may include an optical path converter. An imaging lens system according to a fourth embodiment may include a lens group movable in the optical axis direction. For example, in an imaging lens system according to a fourth embodiment of the present disclosure, the second lens group may be configured to be movable in the optical axis direction. An imaging lens system according to a fourth embodiment may include a joining lens. For example, in an imaging lens system according to a fourth embodiment, a rear lens disposed on the image side closest to the optical path converter may be joined to the optical path converter. For example, the image side of the optical path converter and the object side of the rear lens may be joined to each other.

[0068] An imaging lens system according to a fifth embodiment of the present disclosure may include two lens groups. For example, an imaging lens system according to a fifth embodiment may include a first lens group and a second lens group arranged sequentially along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. However, the number of lens groups constituting the imaging lens system according to a fifth embodiment may not be limited to two. For example, an imaging lens system according to a fifth embodiment may further include a third lens group disposed on the image side of the second lens group. An imaging lens system according to a fifth embodiment may include an optical path converter. For example, in an imaging lens system according to a fifth embodiment, an optical path converter may be disposed between the lenses of the first lens group. An imaging lens system according to a fifth embodiment may include a lens group movable in the optical axis direction. For example, in an imaging lens system according to a fifth embodiment, the second lens group may be configured to be movable in the optical axis direction. An imaging lens system according to a fifth embodiment may include a lens having a concave object-side surface in its paraxial region. For example, the lens in the second lens group disposed closest to the object may have a concave object-side surface in its paraxial region.

[0069] An imaging lens system according to a sixth embodiment of the present disclosure may include two lens groups. For example, an imaging lens system according to a sixth embodiment may include a first lens group and a second lens group arranged sequentially along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. However, the number of lens groups constituting the imaging lens system according to the sixth embodiment may not be limited to two. For example, an imaging lens system according to a sixth embodiment may further include a third lens group disposed on the image side of the second lens group. An imaging lens system according to a sixth embodiment may include an optical path converter. For example, in an imaging lens system according to a sixth embodiment, the optical path converter may be disposed between the lenses of the first lens group. An imaging lens system according to a sixth embodiment may include a lens group movable in the optical axis direction. For example, in an imaging lens system according to a sixth embodiment, the second lens group may be configured to be movable in the optical axis direction. An imaging lens system according to a sixth embodiment may include lenses with a specific Abbe number. For example, an imaging lens system according to a sixth embodiment may include lenses with an Abbe number of 60 or greater. As a specific example, the rear lens in the first lens group disposed closest to the optical path converter on the image side may have an Abbe number of 60 or greater.

[0070] In the imaging lens system according to the sixth embodiment, since the rear lens disposed on the image side closest to the optical path converter has a high Abbe number, chromatic aberration caused by the refractive power of the rear lens can be minimized, which is advantageous in achieving high resolution.

[0071] The imaging lens system according to the seventh embodiment of this disclosure may include multiple lens groups. As an example, the imaging lens system according to the seventh embodiment may include a first lens group and a second lens group arranged sequentially along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. As another example, the imaging lens system according to the seventh embodiment may include a first lens group, a second lens group, and a third lens group arranged sequentially along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. The imaging lens system according to the seventh embodiment may include an optical path converter. For example, in the imaging lens system according to the seventh embodiment, the optical path converter may be disposed between the lenses of the first lens group. The imaging lens system according to the seventh embodiment may satisfy any one or any combination of any two or more of the following conditional expressions:

[0072] 1.50 ≤ fPF / fPR ≤ 6.50 (Conditional Expression 1)

[0073] 0.30≤G1L / GL≤0.80 (Conditional expression 2)

[0074] 0.30≤BFL / GL≤0.80 (Conditional Expression 3)

[0075] 1.20≤DG12 / Gfm≤5.20 (Conditional expression 4)

[0076] 0.050≤ML / R1≤0.60 (Conditional expression 5)

[0077] 0.2≤|ML / R4|≤1.0 (Conditional expression 6)

[0078] 1.0≤G1L / Dp≤4.0 (Conditional expression 7)

[0079] 1.0≤Mf≤3.0 (Conditional expression 8)

[0080] In the above conditional expressions, fPF is the focal length of the front lens closest to the optical path converter on the object side in the first lens group, fPR is the focal length of the rear lens closest to the optical path converter on the image side in the first lens group, G1L is the distance along the optical axis from the object side of the front lens closest to the object in the first lens group to the image side of the lens closest to the imaging plane in the first lens group, GL is the distance along the optical axis from the object side of the front lens to the image side of the rear lens closest to the imaging plane, BFL is the distance along the optical axis from the image side of the rear lens to the imaging plane, DG12 is the maximum distance along the optical axis from the image side of the lens closest to the second lens group in the first lens group to the object side of the lens closest to the first lens group in the second lens group, and Gfm is the distance along the optical axis from the object side of the rear lens to the image plane in the second lens group. The maximum displacement between the position of the optical axis of the second or third lens group on the object focused at infinity by the imaging lens system and the position of the imaging lens system focused on the object at the near-focal position of the imaging lens system (i.e., the minimum focusing distance of the imaging lens system), ML is the distance along the optical axis from the reflective surface of the optical path converter to the image side of the lens closest to the imaging surface in the first lens group, R1 is the radius of curvature of the object side of the front lens closest to the object side of the optical path converter in the first lens group, R4 is the radius of curvature of the image side of the rear lens closest to the image side of the optical path converter in the first lens group, Dp is the diagonal length of the reflective surface of the optical path converter, and Mf is the magnification of the imaging lens system when the imaging lens system is focused on the object at infinity.

[0081] An imaging lens system that satisfies condition expression 1 can maximize image stabilization. For example, an imaging lens system that falls outside the numerical range of condition expression 1 may significantly increase aberrations and potentially reduce resolution due to an excessively long focal length of either the front lens, which is positioned on the object side closest to the optical transducer in the first lens group, or the rear lens, which is positioned on the image side closest to the optical transducer in the first lens group.

[0082] Imaging lens systems that satisfy condition expression 2 can facilitate miniaturization. For example, in imaging lens systems that fall below the lower limit of condition expression 2, it may be difficult to ensure space for the optical path converter, and imaging lens systems that exceed the upper limit of condition expression 2 may have the problem of increasing the size or volume of the camera module.

[0083] Imaging lens systems that satisfy condition expression 3 can be beneficial for miniaturization and imaging surface curvature correction. For example, imaging lens systems falling below the lower limit of condition expression 3 may be advantageous for imaging surface curvature correction, but are detrimental to miniaturization of the imaging lens system and camera module due to the increased lens aperture, and imaging lens systems exceeding the upper limit of condition expression 3 may suffer from reduced resolution due to a significant increase in imaging surface curvature.

[0084] An imaging lens system that satisfies condition expression 4 is advantageous in ensuring sufficient drive space for the image stabilizing lens group (first lens group) and sufficient movement space for the focus-adjusting lens group (second or third lens group). For example, an imaging lens system falling below the lower limit of condition expression 4 may not ensure sufficient drive space for the first lens group used for image stabilization of the camera module, and an imaging lens system exceeding the upper limit of condition expression 4 may not ensure sufficient movement space for the second (or third) lens group used for focus adjustment of the camera module. Furthermore, in imaging lens systems falling outside the numerical range of condition expression 4, aberrations may occur due to the lower refractive power of the second lens group.

[0085] An imaging lens system that satisfies expressions 5 and 6 can minimize resolution variations caused by image stabilization of the camera module. For example, an imaging lens system that satisfies the numerical range of expressions 5 and 6 can stably maintain resolution because the optical path of the first lens group is not significantly altered when the first lens group is driven for image stabilization.

[0086] Condition 7 is a condition used to limit the size of the optical path converter and the size of the imaging lens system. For example, because the thickness of the first lens group including the optical path converter increases, an imaging lens system falling below the lower limit of condition 7 may prevent the miniaturization of the imaging lens system, and an imaging lens system exceeding the upper limit of condition 7 may make it difficult to ensure the performance of the imaging lens system because the optical path converter becomes too small.

[0087] An imaging lens system that satisfies condition expression 8 can achieve constant resolution. For example, an imaging lens system falling below the lower limit of condition expression 8 means that the optical axis of the first lens group is significantly deviated from the optical axis of the second lens group, and an imaging lens system exceeding the upper limit of condition expression 8 means that the optical axis of the second lens group is significantly deviated from the optical axis of the first lens group. In other words, when the first lens group is driven for image stabilization, an imaging lens system falling outside the numerical range of condition expression 8 may have a problem with significant changes in resolution.

[0088] The imaging lens system according to the eighth embodiment of the present disclosure may include a plurality of lenses. For example, the imaging lens system according to the eighth embodiment may include a first lens, an optical path converter, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens that are sequentially arranged along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. However, the number of lenses constituting the imaging lens system according to the eighth embodiment may not be limited to six. For example, the imaging lens system according to the eighth embodiment may further include a seventh lens disposed on the image side of the sixth lens. The imaging lens system according to the eighth embodiment may satisfy a specific conditional expression. For example, the imaging lens system according to the eighth embodiment may satisfy the conditional expression 1.60 < f1 / f < 3.60, where f is the focal length of the imaging lens system when the imaging lens system is focused on an object at infinity, and f1 is the focal length of the first lens.

[0089] The imaging lens system according to the ninth embodiment may include a plurality of lenses that are sequentially arranged along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system, and may satisfy any one or any combination of any two or more of the conditional expressions listed below. For example, the imaging lens system according to the ninth embodiment may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens that are sequentially arranged along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system, or may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens that are sequentially arranged along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system, and may satisfy any one or any combination of any two or more of the following conditional expressions:

[0090] 1.60 < f1 / f < 3.60 (conditional expression 9)

[0091] 0.40 <f3 f>1.20 (Conditional Expression 10)

[0092] -0.40 < f4 / f < -0.20 (Conditional Expression 11)

[0093] 0.20 < |f6 / f| < 0.60 (Conditional Expression 12)

[0094] 1.60 < f1 / f2 < 5.20 (Conditional Expression 13)

[0095] 0.30 < BFL / f < 0.60 (Conditional Expression 14)

[0096] 0.20 < D12 / f < 0.40 (Conditional Expression 15)

[0097] -2.80 < f3 / fR < -0.80 (Conditional Expression 16)

[0098] In the above conditional expressions, f is the focal length of the imaging lens system when the imaging lens system is focused on an object at infinity, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f6 is the focal length of the sixth lens, BFL is the distance along the optical axis from the image side of the last lens closest to the imaging surface in the imaging lens system to the imaging surface, D12 is the distance along the optical axis from the image side of the first lens to the object side of the second lens, and fR is the focal length of the last lens closest to the imaging surface in the imaging lens system.

[0099] Conditional expressions 9 to 13 and conditional expression 16 are conditions for achieving high resolution of the imaging lens system. For example, an imaging lens system that satisfies the numerical ranges of conditional expressions 9 to 13 and conditional expression 16 can be conducive to minimizing various aberrations caused by the first to fourth lenses and the sixth lens.

[0100] Conditional expression 14 can be a condition for the telephoto characteristics and miniaturization of the imaging lens system. For example, it is difficult to miniaturize or achieve telephoto characteristics for an imaging lens system that falls outside the numerical range of conditional expression 14.

[0101] Conditional expression 15 can be a condition for the configuration of the optical path converter and the telephoto characteristics of the imaging lens system. For example, it is difficult to arrange an optical path converter for an imaging lens system that is below the lower limit of conditional expression 15, and it is difficult to achieve telephoto characteristics for an imaging lens system that exceeds the upper limit of conditional expression 15.

[0102] The imaging lens system according to this disclosure may include one or more lenses having the following characteristics as needed. As an example, the imaging lens system according to the first embodiment may include one of a first lens to a seventh lens having the following characteristics. As another example, the imaging lens system according to the second to seventh embodiments may include one or more of a first lens to a seventh lens having the following characteristics. However, the imaging lens system according to the above embodiments may not necessarily include lenses having the following characteristics. The characteristics of the first lens to the seventh lens will be described below.

[0103] The first lens may have refractive power. For example, the first lens may have positive refractive power. The first lens may have a meniscus shape. For example, the first lens may have a convex object-side surface in its paraxial region. As another example, the first lens may have a concave image-side surface in its paraxial region. The first lens may include a spherical surface or an aspherical surface. For example, both surfaces of the first lens may be aspherical. The first lens may be made of a material with high light transmittance and excellent processability. For example, the first lens may be made of a plastic material or a glass material. The first lens may have a predetermined refractive index. For example, the refractive index of the first lens may be greater than 1.5. As a specific example, the refractive index of the first lens may be greater than 1.50 and less than 1.6. The first lens may have a predetermined Abbe number. For example, the Abbe number of the first lens may be 50 or greater.

[0104] The second lens may have refractive power. For example, the second lens may have positive refractive power. The second lens may have a convex shape on one surface. For example, the second lens may have a convex image-side surface in its paraxial region. The second lens may include a flat surface, a spherical surface, or an aspherical surface. For example, the object-side surface of the second lens may be flat. As another example, the image-side surface of the second lens may be spherical. The second lens may be made of a material with high light transmittance and excellent processability. For example, the second lens may be made of plastic or glass. The second lens may have a predetermined refractive index. For example, the refractive index of the second lens may be less than 1.5. The second lens may have a predetermined Abbe number. For example, the Abbe number of the second lens may be 60 or greater. As another example, the Abbe number of the second lens may be 80 or greater.

[0105] The third lens may have refractive power. For example, the third lens may have positive refractive power. The third lens may have a convex shape on one surface. For example, the third lens may have a convex image-side surface in its paraxial region. The third lens may include a spherical surface or an aspherical surface. For example, both surfaces of the third lens may be aspherical. The third lens may be made of a material with high light transmittance and excellent processability. For example, the third lens may be made of a plastic material. The third lens may have a predetermined refractive index. For example, the refractive index of the third lens may be greater than 1.5. The third lens may have a predetermined Abbe number. For example, the Abbe number of the third lens may be greater than 50.

[0106] The fourth lens may have refractive power. For example, the fourth lens may have negative refractive power. The fourth lens may have a concave shape on one surface. As an example, the fourth lens may have a concave object-side surface in its paraxial region. As another example, the fourth lens may have a concave image-side surface in its paraxial region. The fourth lens may include a spherical or aspherical surface. For example, both surfaces of the fourth lens may be aspherical. The fourth lens may be made of a material with high light transmittance and excellent processability. For example, the fourth lens may be made of a plastic material. The fourth lens may have a predetermined refractive index. As an example, the refractive index of the fourth lens may be greater than 1.6. The fourth lens may have a predetermined Abbe number. For example, the Abbe number of the fourth lens may be greater than 20. As a specific example, the Abbe number of the fourth lens may be greater than 20 and less than 30.

[0107] The fifth lens may have refractive power. For example, the fifth lens may have positive or negative refractive power. The fifth lens may have a convex shape on one surface. As an example, the fifth lens may have a convex object-side surface in its paraxial region. The fifth lens may include a spherical or aspherical surface. For example, both surfaces of the fifth lens may be aspherical. The fifth lens may be made of a material with high light transmittance and excellent processability. For example, the fifth lens may be made of a plastic material. The fifth lens may have a predetermined refractive index. As an example, the refractive index of the fifth lens may be greater than 1.5.

[0108] The sixth lens may have refractive power. For example, the sixth lens may have positive or negative refractive power. The sixth lens may have a convex or concave shape on one surface. As an example, a sixth lens with positive refractive power may have a convex object-side surface or a convex image-side surface in its paraxial region. As another example, a sixth lens with negative refractive power may have a concave object-side surface or a concave image-side surface in its paraxial region. The sixth lens may include a spherical or aspherical surface. For example, both surfaces of the sixth lens may be aspherical. The sixth lens may be made of a material with high light transmittance and excellent processability. For example, the sixth lens may be made of a plastic material. The sixth lens may have a predetermined refractive index. As an example, the refractive index of the sixth lens may be greater than 1.6. The sixth lens may have a predetermined Abbe number. For example, the Abbe number of the sixth lens may be greater than 20. As a specific example, the Abbe number of the sixth lens may be greater than 20 and less than 30.

[0109] The seventh lens can have refractive power. For example, the seventh lens can have negative refractive power. The seventh lens can have a concave shape on one surface. As an example, the seventh lens can have a concave image-side surface in its paraxial region. The seventh lens can include a spherical or aspherical surface. For example, both surfaces of the seventh lens can be aspherical. The seventh lens can be made of a material with high light transmittance and excellent processability. For example, the seventh lens can be made of a plastic material. The seventh lens can have a predetermined refractive index. As an example, the refractive index of the seventh lens can be greater than 1.6. The seventh lens can have a predetermined Abbe number. For example, the Abbe number of the seventh lens can be greater than 20. As a specific example, the Abbe number of the seventh lens can be greater than 20 and less than 30.

[0110] As described above, the first to seventh lenses may include spherical or aspherical surfaces. When the first to seventh lenses include aspherical surfaces, the aspherical surface of the corresponding lens can be represented by Equation 1 below.

[0111]

[0112] In Equation 1, c is the curvature of the lens surface, and is equal to the reciprocal of the radius of curvature of the lens surface at the optical axis; k is the quadratic constant; and r is the distance from any point on the aspherical surface of the lens to the optical axis. Furthermore, constants A through D are aspherical surface coefficients. Z (also called the sagitta) is the distance from a point on the aspherical surface of the lens at a distance r from the optical axis to a tangent plane perpendicular to the optical axis and intersecting the vertex of the aspherical surface, in a direction parallel to the optical axis.

[0113] The imaging lens system according to the above embodiments or forms may further include an aperture stop and a filter. The aperture stop may be disposed between the third and fourth lenses. The filter may be disposed between the final lens (sixth or seventh lens) and the imaging plane. The filter may be configured to block light of a specific wavelength. For reference, the filter described in this specification is configured to block infrared light, but the wavelength of light blocked by the filter is not limited to infrared.

[0114] In the following, specific embodiments of this disclosure will be described in detail based on the accompanying drawings.

[0115] Figure 1 and Figure 2 This is a configuration diagram of an imaging lens system according to a first embodiment of the present disclosure.

[0116] Reference Figure 1 The imaging lens system 100 may include multiple lens groups. For example, the imaging lens system 100 may include a first lens group LG1 and a second lens group LG2. The first lens group LG1 and the second lens group LG2 may be arranged sequentially along the optical axis of the imaging lens system 100 from the object side of the imaging lens system 100 toward the imaging surface IP of the imaging lens system 100. The first lens group LG1 and the second lens group LG2 may include one or more lenses. For example, the first lens group LG1 may include two lenses, and the second lens group LG2 may include four lenses. The imaging lens system 100 may include an optical path converter. As an example, the imaging lens system 100 may include a prism P disposed between the two lenses of the first lens group LG1. For reference, in this embodiment, the prism P is shown as a type of optical path converter, but the optical path converter may also be changed to a reflector.

[0117] The first lens group LG1 may include a first lens 110 and a second lens 120. The first lens 110 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The second lens 120 may have positive refractive power and a convex image-side surface in its paraxial region. The second lens 120 may be positioned very close to the image-side surface of the prism P. For example, the object-side surface of the second lens 120 may be flat, allowing it to be integrated with the image-side surface of the prism P. As another example, the second lens 120 may be integrally formed with the image-side surface of the prism P.

[0118] The second lens group LG2 may include a third lens 130, a fourth lens 140, a fifth lens 150, and a sixth lens 160. The third lens 130 may have positive refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fourth lens 140 may have negative refractive power, a concave object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The fifth lens 150 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The sixth lens 160 may have negative refractive power, a concave object-side surface in its paraxial region, and a concave image-side surface in its paraxial region.

[0119] The imaging lens system 100 can be installed in a camera module capable of image stabilization and focus adjustment. For example, in the imaging lens system 100, the first lens group LG1 can be as follows: Figure 2 The image is stabilized by rotating about an axis intersecting the optical axis, and the second lens group LG2 can be rotated as shown. Figure 2 The image shows a movement along the optical axis to perform focus adjustment. In this embodiment, the change in focal length (f) of the imaging lens system 100 caused by the movement of the second lens group LG2 can be very small. Therefore, even when adjusting the focus by moving the second lens group LG2, the imaging lens system 100 according to this embodiment can achieve a substantially constant quality resolution.

[0120] In addition to the first lens 110 through the sixth lens 160, the imaging lens system 100 may also include other elements. For example, the imaging lens system 100 may also include an aperture stop ST, a filter IF, and an imaging surface IP. The aperture stop ST may be disposed between the third lens 130 and the fourth lens 140. The filter IF may be disposed between the sixth lens 160 and the imaging surface IP. The imaging surface IP may be located at the position where the light incident through the first lens 110 through the sixth lens 160 forms an image. For example, the imaging surface IP may be located on a surface of the image sensor IS of the camera module or on a lens element disposed inside the image sensor IS.

[0121] Figure 3 The aberration characteristics of the imaging lens system 100 according to this embodiment are shown.

[0122] Tables 1 and 2 below list the lens characteristics of the imaging lens system 100 according to this embodiment, and Table 3 below lists the aspherical values ​​of the imaging lens system 100 according to this embodiment. Table 2 lists the lens characteristics when the imaging lens system 100 is focused on an object at infinity and when the imaging lens system 100 is focused on an object at a near-focal position of the imaging lens system 100 (i.e., at the minimum focusing distance of the imaging lens system 100).

[0123] Table 1

[0124]

[0125]

[0126] Table 2

[0127] Objects at infinity Objects at close focus D0 Infinity 300 D1 2.00306 2.83725 D2 6.22817 5.39398 D3 0.50134 0.54697 D4 -0.00134 -0.04697 f 18.61152 17.50609 Dp 2.96985 2.96985 FOV 11.10109 10.67406 f number 2.91441 2.83557 TTL 23.79880 23.79880

[0128] Table 3

[0129]

[0130]

[0131] Figure 4 and Figure 5 This is a configuration diagram of an imaging lens system according to a second embodiment of the present disclosure.

[0132] Reference Figure 4 The imaging lens system 200 may include multiple lens groups. For example, the imaging lens system 200 may include a first lens group LG1, a second lens group LG2, and a third lens group LG3. The first lens group LG1, the second lens group LG2, and the third lens group LG3 may be arranged sequentially along the optical axis of the imaging lens system 200 from the object side of the imaging lens system 200 toward the imaging surface IP of the imaging lens system 200. The first lens group LG1 to the third lens group LG3 may include one or more lenses. For example, the first lens group LG1 may include two lenses, the second lens group LG2 may include two lenses, and the third lens group LG3 may include two lenses. The imaging lens system 200 may include an optical path converter. As an example, the imaging lens system 200 may include a prism P disposed between the two lenses of the first lens group LG1. For reference, in this embodiment, the prism P is shown as one type of optical path converter, but the optical path converter may also be changed to a reflector.

[0133] The first lens group LG1 may include a first lens 210 and a second lens 220. The first lens 210 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The second lens 220 may have positive refractive power and a convex image-side surface in its paraxial region. The second lens 220 may be positioned very close to the image-side surface of the prism P. For example, the object-side surface of the second lens 220 may be flat, allowing it to be integrated with the image-side surface of the prism P. As another example, the second lens 220 may be integrally formed with the image-side surface of the prism P.

[0134] The second lens group LG2 may include a third lens 230 and a fourth lens 240. The third lens 230 may have positive refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fourth lens 240 may have negative refractive power, a concave object-side surface in its paraxial region, and a concave image-side surface in its paraxial region.

[0135] The third lens group LG3 may include a fifth lens 250 and a sixth lens 260. The fifth lens 250 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The sixth lens 260 may have negative refractive power, a concave object-side surface in its paraxial region, and a concave image-side surface in its paraxial region.

[0136] The imaging lens system 200 can be installed in a camera module capable of image stabilization and focus adjustment. For example, in the imaging lens system 200, the first lens group LG1 can be as follows: Figure 5 The image is stabilized by rotating about an axis intersecting the optical axis, and the second lens group LG2 can be rotated as shown. Figure 5 The image shows a movement along the optical axis to perform focus adjustment. In this embodiment, the change in focal length (f) of the imaging lens system 200 caused by the movement of the second lens group LG2 can be very small. Therefore, even when adjusting the focus by moving the second lens group LG2, the imaging lens system 200 according to this embodiment can achieve a substantially constant quality resolution.

[0137] In addition to the first lens 210 through the sixth lens 260, the imaging lens system 200 may also include other elements. For example, the imaging lens system 200 may also include an aperture stop ST, a filter IF, and an imaging surface IP. The aperture stop ST may be disposed between the third lens 230 and the fourth lens 240. The filter IF may be disposed between the sixth lens 260 and the imaging surface IP. The imaging surface IP may be located at the position where the light incident through the first lens 210 through the sixth lens 260 forms an image. For example, the imaging surface IP may be located on a surface of the image sensor IS of the camera module or on a lens element disposed inside the image sensor IS.

[0138] Figure 6 The aberration characteristics of the imaging lens system 200 according to this embodiment are shown.

[0139] Tables 4 and 5 below list the lens characteristics of the imaging lens system 200 according to this embodiment, and Table 6 below lists the aspherical values ​​of the imaging lens system 200 according to this embodiment. Table 5 lists the lens characteristics when the imaging lens system 200 is focused on an object at infinity and when the imaging lens system 200 is focused on an object at a near-focal position of the imaging lens system 200 (i.e., at the minimum focusing distance of the imaging lens system 200).

[0140] Table 4

[0141]

[0142]

[0143] Table 5

[0144] Objects at infinity Objects at close focus D0 Infinity 300 D1 2.14374 2.67193 D2 3.06556 2.53738 D3 6.44336 6.44336 D4 0.49566 0.51659 D5 0.00434 -0.01659 f 18.61121 17.74058 Dp 2.96985 2.96985 FOV 11.42710 10.77930 f number 2.88651 2.86237 TTL 23.39685 23.39685

[0145] Table 6

[0146]

[0147]

[0148] Figure 7 and Figure 8 This is a configuration diagram of the imaging lens system according to the third embodiment.

[0149] Reference Figure 7 The imaging lens system 300 may include multiple lens groups. For example, the imaging lens system 300 may include a first lens group LG1, a second lens group LG2, and a third lens group LG3. The first lens group LG1, the second lens group LG2, and the third lens group LG3 may be arranged sequentially along the optical axis of the imaging lens system 300 from the object side of the imaging lens system 300 toward the imaging surface IP of the imaging lens system 300. The first lens group LG1 to the third lens group LG3 may include one or more lenses. For example, the first lens group LG1 may include two lenses, the second lens group LG2 may include two lenses, and the third lens group LG3 may include two lenses. The imaging lens system 300 may include an optical path converter. As an example, the imaging lens system 300 may include a prism P disposed between the two lenses of the first lens group LG1. For reference, in this embodiment, the prism P is shown as one type of optical path converter, but the optical path converter may also be changed to a reflector.

[0150] The first lens group LG1 may include a first lens 310 and a second lens 320. The first lens 310 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The second lens 320 may have positive refractive power and a convex image-side surface in its paraxial region. The second lens 320 may be positioned very close to the image-side surface of the prism P. For example, the object-side surface of the second lens 320 may be flat, allowing it to be integrated with the image-side surface of the prism P. As another example, the second lens 320 may be integrally formed with the image-side surface of the prism P.

[0151] The second lens group LG2 may include a third lens 330 and a fourth lens 340. The third lens 330 may have positive refractive power, a concave object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fourth lens 340 may have negative refractive power, a concave object-side surface in its paraxial region, and a concave image-side surface in its paraxial region.

[0152] The third lens group LG3 may include a fifth lens 350 and a sixth lens 360. The fifth lens 350 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The sixth lens 360 may have negative refractive power, a concave object-side surface in its paraxial region, and a concave image-side surface in its paraxial region.

[0153] The imaging lens system 300 can be installed in a camera module capable of image stabilization and focus adjustment. For example, in the imaging lens system 300, the first lens group LG1 can be as follows: Figure 8 The image stabilization is performed by rotating about an axis intersecting the optical axis, and the third lens group LG3 can be rotated as shown. Figure 8 The image shows a movement along the optical axis to perform focus adjustment. In this embodiment, the change in focal length (f) of the imaging lens system 300 caused by the movement of the third lens group LG3 can be very small. Therefore, even when adjusting the focus by moving the third lens group LG3, the imaging lens system 300 according to this embodiment can achieve a substantially constant quality resolution.

[0154] In addition to the first lens 310 to the sixth lens 360, the imaging lens system 300 may also include other elements. For example, the imaging lens system 300 may also include an aperture stop ST, a filter IF, and an imaging surface IP. The aperture stop ST may be disposed between the third lens 330 and the fourth lens 340. The filter IF may be disposed between the sixth lens 360 and the imaging surface IP. The imaging surface IP may be located at the position where the light incident through the first lens 310 to the sixth lens 360 forms an image. For example, the imaging surface IP may be located on a surface of the image sensor IS of the camera module or on a lens element disposed inside the image sensor IS.

[0155] Figure 9 The aberration characteristics of the imaging lens system 300 according to this embodiment are shown.

[0156] Tables 7 and 8 below list the lens characteristics of the imaging lens system 300 according to this embodiment, and Table 9 below lists the aspherical values ​​of the imaging lens system 300 according to this embodiment. Table 8 lists the lens characteristics when the imaging lens system 300 is focused on an object at infinity and when the imaging lens system 300 is focused on an object at a near-focal position of the imaging lens system 300 (i.e., at the minimum focusing distance of the imaging lens system 300).

[0157] Table 7

[0158]

[0159]

[0160] Table 8

[0161] Objects at infinity Objects at close focus D0 infinity 300 D1 1.87423 0.67004 D2 7.94483 9.14901 D3 0.56199 0.58142 D4 -0.06199 -0.08142 f 18.61076 18.36615 Dp 2.96985 2.96985 FOV 11.29553 10.03714 f number 2.86697 3.10441 TTL 24.03836 24.03836

[0162] Table 9

[0163]

[0164]

[0165] Figure 10 and Figure 11 This is a configuration diagram of an imaging lens system according to the fourth embodiment of this disclosure.

[0166] Reference Figure 10 The imaging lens system 400 may include multiple lens groups. For example, the imaging lens system 400 may include a first lens group LG1 and a second lens group LG2. The first lens group LG1 and the second lens group LG2 may be arranged sequentially along the optical axis of the imaging lens system 400 from the object side of the imaging lens system 400 toward the imaging surface IP of the imaging lens system 400. The first lens group LG1 and the second lens group LG2 may include one or more lenses. For example, the first lens group LG1 may include two lenses, and the second lens group LG2 may include five lenses. The imaging lens system 400 may include an optical path converter. As an example, the imaging lens system 400 may include a prism P disposed between the two lenses of the first lens group LG1. For reference, in this embodiment, the prism P is shown as one type of optical path converter, but the optical path converter may also be changed to a reflector.

[0167] The first lens group LG1 may include a first lens 410 and a second lens 420. The first lens 410 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The second lens 420 may have positive refractive power and a convex image-side surface in its paraxial region. The second lens 420 may be positioned very close to the image-side surface of the prism P. For example, the object-side surface of the second lens 420 may be flat to integrate with the image-side surface of the prism P. As another example, the second lens 420 may be integrally formed with the image-side surface of the prism P.

[0168] The second lens group LG2 may include a third lens 430, a fourth lens 440, a fifth lens 450, a sixth lens 460, and a seventh lens 470. The third lens 430 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fourth lens 440 may have negative refractive power, a concave object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The fifth lens 450 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The sixth lens 460 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The seventh lens 470 may have negative refractive power, a concave object-side surface in its paraxial region, and a concave image-side surface in its paraxial region.

[0169] The imaging lens system 400 can be installed in a camera module capable of image stabilization and focus adjustment. For example, in the imaging lens system 400, the first lens group LG1 can be as follows: Figure 11 The image is stabilized by rotating about an axis intersecting the optical axis, and the second lens group LG2 can be rotated as shown. Figure 11 The image shows a movement along the optical axis to perform focus adjustment. In this embodiment, the change in focal length (f) of the imaging lens system 400 caused by the movement of the second lens group LG2 can be very small. Therefore, even when adjusting the focus by moving the second lens group LG2, the imaging lens system 400 according to this embodiment can achieve a substantially constant quality resolution.

[0170] In addition to the first lens 410 to the seventh lens 470, the imaging lens system 400 may also include other elements. For example, the imaging lens system 400 may also include an aperture stop ST, a filter IF, and an imaging surface IP. The aperture stop ST may be disposed between the third lens 430 and the fourth lens 440. The filter IF may be disposed between the seventh lens 470 and the imaging surface IP. The imaging surface IP may be located at the position where the light incident through the first lens 410 to the seventh lens 470 forms an image. For example, the imaging surface IP may be located on a surface of the image sensor IS of the camera module or on a lens element disposed inside the image sensor IS.

[0171] Figure 12 The aberration characteristics of the imaging lens system 400 according to this embodiment are shown.

[0172] Tables 10 and 11 below list the lens characteristics of the imaging lens system 400 according to this embodiment, and Table 12 below lists the aspherical values ​​of the imaging lens system 400 according to this embodiment. Table 11 lists the lens characteristics when the imaging lens system 400 is focused on an object at infinity and when the imaging lens system 400 is focused on an object at a near-focal position of the imaging lens system 400 (i.e., at the minimum focusing distance of the imaging lens system 400).

[0173] Table 10

[0174]

[0175]

[0176] Table 11

[0177] Objects at infinity Objects at close focus D0 Infinity 300 D1 1.35000 1.99326 D2 6.27128 5.62802 D3 0.50721 0.57804 D4 -0.00721 -0.07804 f 18.61080 17.16046 Dp 2.96985 2.96985 FOV 10.85176 10.55991 f number 2.92038 2.77078 TTL 22.97232 22.97232

[0178] Table 12

[0179]

[0180]

[0181] Figure 13 and Figure 14 This is a configuration diagram of an imaging lens system according to the fifth embodiment of this disclosure.

[0182] Reference Figure 13 The imaging lens system 500 may include multiple lens groups. For example, the imaging lens system 500 may include a first lens group LG1 and a second lens group LG2. The first lens group LG1 and the second lens group LG2 may be arranged sequentially along the optical axis of the imaging lens system 500 from the object side of the imaging lens system 500 toward the imaging surface IP of the imaging lens system 500. The first lens group LG1 and the second lens group LG2 may include one or more lenses. For example, the first lens group LG1 may include two lenses, and the second lens group LG2 may include five lenses. The imaging lens system 500 may include an optical path converter. As an example, the imaging lens system 500 may include a prism P disposed between the two lenses of the first lens group LG1. For reference, in this embodiment, the prism P is shown as a type of optical path converter, but the optical path converter may also be changed to a reflector.

[0183] The first lens group LG1 may include a first lens 510 and a second lens 520. The first lens 510 may have positive refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The second lens 520 may have positive refractive power and a convex image-side surface in its paraxial region. The second lens 520 may be positioned very close to the image-side surface of the prism P. For example, the object-side surface of the second lens 520 may be flat, allowing it to be integrated with the image-side surface of the prism P. As another example, the second lens 520 may be integrally formed with the image-side surface of the prism P.

[0184] The second lens group LG2 may include a third lens 530, a fourth lens 540, a fifth lens 550, a sixth lens 560, and a seventh lens 570. The third lens 530 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The fourth lens 540 may have negative refractive power, a concave object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The fifth lens 550 may have negative refractive power, a convex object-side surface in its paraxial region, and a concave image-side surface in its paraxial region. The sixth lens 560 may have positive refractive power, a convex object-side surface in its paraxial region, and a convex image-side surface in its paraxial region. The seventh lens 570 may have negative refractive power, a concave object-side surface in its paraxial region, and a concave image-side surface in its paraxial region.

[0185] The imaging lens system 500 can be installed in a camera module capable of image stabilization and focus adjustment. For example, in the imaging lens system 500, the first lens group LG1 can be as follows: Figure 14 The image is stabilized by rotating about an axis intersecting the optical axis, and the second lens group LG2 can be rotated as shown. Figure 14 The image shows a movement along the optical axis to perform focus adjustment. In this embodiment, the change in focal length (f) of the imaging lens system 500 caused by the movement of the second lens group LG2 can be very small. Therefore, even when adjusting the focus by moving the second lens group LG2, the imaging lens system 500 according to this embodiment can achieve a substantially constant quality resolution.

[0186] In addition to the first lens 510 through the seventh lens 570, the imaging lens system 500 may also include other elements. For example, the imaging lens system 500 may also include an aperture stop ST, a filter IF, and an imaging surface IP. The aperture stop ST may be disposed between the third lens 530 and the fourth lens 540. The filter IF may be disposed between the seventh lens 570 and the imaging surface IP. The imaging surface IP may be located at the position where the light incident through the first lens 510 through the seventh lens 570 forms an image. For example, the imaging surface IP may be located on a surface of the image sensor IS of the camera module or on a lens element disposed inside the image sensor IS.

[0187] Figure 15 The aberration characteristics of the imaging lens system 500 according to this embodiment are shown.

[0188] Tables 13 and 14 below list the lens characteristics of the imaging lens system 500 according to this embodiment, and Table 15 below lists the aspherical values ​​of the imaging lens system 500 according to this embodiment. Table 14 lists the lens characteristics when the imaging lens system 500 is focused on an object at infinity and when the imaging lens system 500 is focused on an object at a near-focal position of the imaging lens system 500 (i.e., at the minimum focusing distance of the imaging lens system 500).

[0189] Table 13

[0190]

[0191]

[0192] Table 14

[0193] Objects at infinity Objects at close focus D0 Infinity 300 D1 2.50000 3.44852 D2 6.33853 5.38807 D3 0.50895 0.51090 D4 -0.00895 -0.01090 f 18.61081 17.15039 Dp 2.96985 2.96985 FOV 10.91238 10.53593 f number 2.87859 2.64071 TTL 23.92396 23.92202

[0194] Table 15

[0195]

[0196]

[0197] Table 16 below lists the focal lengths of the first to sixth lenses or the first to seventh lenses of the imaging lens system according to the first to fifth embodiments.

[0198] Table 16

[0199] First Implementation Method Second embodiment Third Implementation Method Fourth Implementation Method Fifth Implementation Method f1 41.409 39.191 37.183 33.268 58.837 f2 14.583 14.939 15.026 14.121 14.127 f3 16.371 17.970 18.292 12.279 8.924 f4 -5.469 -5.684 -5.233 -4.767 -3.980 f5 5.719 5.565 4.939 -48.263 -36.388 f6 -7.150 -7.405 -7.326 6.244 5.384 f7 - - - -9.253 -9.320

[0200] According to examples from the first to fifth embodiments, the imaging lens system according to this disclosure can have specific lens characteristics. For example, the focal length of the first lens can be in the range of 30mm to 70mm, the focal length of the second lens can be in the range of 12.0mm to 18.0mm, the focal length of the third lens can be in the range of 8.0mm to 20mm, the focal length of the fourth lens can be in the range of -8.0mm to -3.0mm, the focal length of the fifth lens can be in the range of 4.0mm to 6.0mm or less than -30mm, the focal length of the sixth lens can be in the range of 4.0mm to 8.0mm or -10mm to -6.0mm, and the focal length of the seventh lens can be in the range of -12mm to -8.0mm.

[0201] Tables 17 and 18 below list the conditional expression values ​​for the imaging lens systems according to the first to fifth embodiments.

[0202] Table 17

[0203]

[0204] Table 18

[0205]

[0206] While this disclosure includes specific examples, it will be apparent upon understanding this disclosure that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The description of features or aspects in each example should be considered applicable to similar features or aspects in other examples. Suitable results may still be achieved if the described techniques are performed in a different order, and / or if components in the described system, architecture, device, or circuit are combined 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 imaging lens system, characterized in that, The imaging lens system includes: The first lens group includes one or more lenses and an optical path converter; and The second lens group includes one or more lenses and is configured to be movable in the optical axis direction. The first lens group and the second lens group are arranged sequentially along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. The imaging lens system satisfies the following conditional expression: 1.50≤fPF / fPR≤6.50 Wherein, fPF is the focal length of the front lens of the first lens group disposed on the object side closest to the optical path converter, and fPR is the focal length of the rear lens of the first lens group disposed on the image side closest to the optical path converter.

2. The imaging lens system according to claim 1, characterized in that, The front lens of the first lens group has a convex object-side surface in its paraxial region.

3. The imaging lens system according to claim 1, characterized in that, The rear lens of the first lens group has a convex image-side surface in its paraxial region.

4. The imaging lens system according to claim 1, characterized in that, The foremost lens of the second lens group, which is closest to the image side of the rear lens of the first lens group, has a convex image side in its paraxial region.

5. The imaging lens system according to claim 1, characterized in that, The last lens of the second lens group, positioned closest to the imaging plane, has a concave object-side surface in its paraxial region.

6. The imaging lens system according to claim 1, characterized in that, The last lens of the second lens group, positioned closest to the imaging plane, has a concave image-side surface in its paraxial region.

7. The imaging lens system according to claim 1, characterized in that, The optical path converter includes a reflective surface, and The imaging lens system also satisfies the following conditional expression: 0.050≤ML / R1≤0.60 Wherein, ML is the distance along the optical axis from the reflective surface of the optical path converter to the image-side surface of the rear lens of the first lens group, and R1 is the radius of curvature of the object-side surface of the front lens of the first lens group.

8. The imaging lens system according to claim 1, characterized in that, The optical path converter includes a reflective surface, and The imaging lens system also satisfies the following conditional expression: 0.2 ≤ |ML / R4| ≤ 1.0 Wherein, ML is the distance along the optical axis from the reflective surface of the optical path converter to the image-side surface of the rear lens of the first lens group, and R4 is the radius of curvature of the image-side surface of the rear lens of the first lens group.

9. An imaging lens system, characterized in that, The imaging lens system includes: Along the optical axis of the imaging lens system, from the object side of the imaging lens system toward the imaging surface of the imaging lens system, a first lens, an optical path converter, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens are arranged sequentially: a first lens, a light path converter, a second lens with a convex image-side surface in its paraxial region, and a sixth lens. The imaging lens system satisfies the following conditional expression: 1.60 <f1 / f<3.60 Where f is the focal length of the imaging lens system when the imaging lens system is focused on an object at infinity, and f1 is the focal length of the first lens.

10. The imaging lens system according to claim 9, characterized in that, The first lens has a convex object-side surface in its paraxial region.

11. The imaging lens system according to claim 9, characterized in that, The first lens has a concave image-side surface in its paraxial region.

12. The imaging lens system according to claim 9, characterized in that, The second lens has a flat object side that engages with the image side of the optical path converter.

13. The imaging lens system according to claim 9, characterized in that, The third lens has a convex image-side surface in its paraxial region.

14. The imaging lens system according to claim 9, characterized in that, The fourth lens has a concave object-side surface in its paraxial region.

15. The imaging lens system according to claim 9, characterized in that, The fourth lens has a concave image-side surface in its paraxial region.

16. The imaging lens system according to claim 9, characterized in that, The fifth lens has a convex object-side surface in its paraxial region.

17. An imaging lens system, characterized in that, The imaging lens system includes: The first lens has positive refractive power and a convex object-side surface in its paraxial region; Optical path converter; The second lens has positive refractive power and a convex image-side surface in its paraxial region; The third lens has refractive power and a concave object-side surface in its paraxial region; The fourth lens has refractive power; The fifth lens has refractive power; and The sixth lens has refractive power and a concave image-side surface in its paraxial region. The first lens, the optical path converter, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged sequentially along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. Each of the first to sixth lenses has a single refractive index and is a lens with refractive power in the imaging lens system. The third to sixth lenses are spaced apart from each other along the optical axis. The first lens, the optical path converter, and the second lens are included in the first lens group, and The third to sixth lenses are included in a second lens group configured to move along the optical axis to adjust the focal point of the imaging lens system; or the third and fourth lenses are included in a second lens group configured to move along the optical axis to adjust the focal point of the imaging lens system and the fifth and sixth lenses are included in a third lens group; or the third and fourth lenses are included in a second lens group and the fifth and sixth lenses are included in a third lens group configured to move along the optical axis to adjust the focal point of the imaging lens system.

18. The imaging lens system according to claim 17, characterized in that, The second lens has a flat object side that engages with the image side of the optical path converter.

19. The imaging lens system according to claim 17, characterized in that, The first lens group is configured to rotate about an axis perpendicular to the optical axis to perform image stabilization.

20. The imaging lens system according to claim 17, characterized in that, The optical path converter includes a reflective surface, and The imaging lens system satisfies the following conditional expression: 1.0 ≤ G1L / Dp ≤ 4.0 Wherein, G1L is the distance along the optical axis from the object side of the first lens to the image side of the second lens, and Dp is the diagonal length of the reflective surface of the optical path converter.

21. The imaging lens system according to claim 17, characterized in that, The imaging lens system satisfies the following conditional expression: 1.50≤fPF / fPR≤6.50 Where fPF is the focal length of the first lens and fPR is the focal length of the second lens.

22. The imaging lens system according to claim 17, characterized in that, The imaging lens system satisfies the following conditional expression: 1.60 <f1 / f<3.60 Where f is the focal length of the imaging lens system when the imaging lens system is focused on an object at infinity, and f1 is the focal length of the first lens.

23. An imaging lens system, characterized in that, The imaging lens system includes: The first lens has positive refractive power and a convex object-side surface in its paraxial region; Optical path converter; The second lens has positive refractive power and a convex image-side surface in its paraxial region; The third lens has refractive power and a convex object-side surface in its paraxial region; The fourth lens has refractive power; The fifth lens has refractive power; The sixth lens has refractive power; and The seventh lens has refractive power and a concave image-side surface in its paraxial region. The first lens, the optical path converter, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are arranged sequentially along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. Each of the first through seventh lenses has a single refractive index and is a lens with refractive power in the imaging lens system. The third lens to the seventh lens are spaced apart from each other along the optical axis. The first lens, the optical path converter, and the second lens are included in the first lens group, and The third to seventh lenses are included in a second lens group, which is configured to move along the optical axis to adjust the focus of the imaging lens system.

24. The imaging lens system according to claim 23, characterized in that, The second lens has a flat object side that engages with the image side of the optical path converter.

25. The imaging lens system according to claim 23, characterized in that, The first lens group is configured to rotate about an axis perpendicular to the optical axis to perform image stabilization.

26. The imaging lens system according to claim 23, characterized in that, The optical path converter includes a reflective surface, and The imaging lens system satisfies the following conditional expression: 1.0 ≤ G1L / Dp ≤ 4.0 Wherein, G1L is the distance along the optical axis from the object side of the first lens to the image side of the second lens, and Dp is the diagonal length of the reflective surface of the optical path converter.

27. The imaging lens system according to claim 23, characterized in that, The imaging lens system satisfies the following conditional expression: 1.50≤fPF / fPR≤6.50 Where fPF is the focal length of the first lens and fPR is the focal length of the second lens.

28. The imaging lens system according to claim 23, characterized in that, The imaging lens system satisfies the following conditional expression: 1.60 <f1 / f<3.60 Where f is the focal length of the imaging lens system when the imaging lens system is focused on an object at infinity, and f1 is the focal length of the first lens.

Images