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] The present disclosure relates to an imaging lens system configured to minimize a resolution decrease due to a change in viewing angle. Background art

[0004] Portable electronic devices include a camera module for capturing still images or shooting moving images. For example, the camera module may be mounted on a mobile phone, a laptop computer, a gaming console, or other portable electronic devices. Such portable electronic devices are generally manufactured in a compact size or a 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 may be configured to generate images of a constant quality regardless of the user's usage environment. For example, the camera module may include an image stabilization function. However, since the image stabilization function 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 change the viewing angle of the telephoto camera module or reduce the resolution of the telephoto camera module. Summary of the invention

[0005] The Summary of the Invention section is intended to introduce, in a brief form, a selection of concepts that will be further described in the Detailed Description section below. The Summary of the Invention section is not intended to identify key features 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, an 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 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, where fPF is the focal length of the front lens disposed on the object side closest to the optical path converter of the first lens group, and fPR is the focal length of the rear lens disposed on the image side closest to the optical path converter of the first lens group.

[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, an imaging lens system includes: 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 concave object side surface in its paraxial region; a fourth lens having a refractive power; a fifth lens having a refractive power; and a sixth 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, and the 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, each of the first lens to the sixth lens has a single refractive index and is a lens having a refractive power in the imaging lens system, the third lens to the sixth 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 a first lens group, and the third lens to the sixth lens are included in a second lens group configured to be movable along the optical axis to adjust the focus of the imaging lens system, or the third lens and the fourth lens are included in a second lens group configured to be movable along the optical axis to adjust the focus of the imaging lens system and the fifth lens and the sixth lens are included in a third lens group, or the third lens and the fourth lens are included in a second lens group and the fifth lens and the sixth lens are included in a third lens group configured to be movable along the optical axis to adjust the focus of the imaging lens system.

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

[0024] The first lens group may be configured to be rotatable 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 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.

[0026] The imaging lens system may 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 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.

[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 are configuration diagrams of an imaging lens system according to a first embodiment of the present disclosure.

[0036] Figure 3 show Figure 1 the aberration characteristics of the imaging lens system shown in

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

[0038] Figure 6 show Figure 4 the aberration characteristics of the imaging lens system shown in

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

[0040] Figure 9 show Figure 7 the aberration characteristics of the imaging lens system shown in

[0041] Figure 10 and Figure 11 are configuration diagrams of an imaging lens system according to a fourth embodiment of the present disclosure.

[0042] Figure 12 show Figure 10 the aberration characteristics of the imaging lens system shown in

[0043] Figure 13 and Figure 14 are configuration diagrams of an imaging lens system according to a fifth embodiment of the present disclosure.

[0044] Figure 15 show Figure 13 the aberration characteristics of the imaging lens system shown in

[0045] Throughout the drawings and the detailed description, like reference numerals refer to like elements. For clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative dimensions, proportions, and depictions of the elements in the drawings may be exaggerated. Detailed Description

[0046] The following specific embodiments are provided to assist the reader in obtaining a comprehensive understanding of the methods, apparatuses, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and, except for operations that must occur in a specific order, is not limited to the order set forth herein and may be changed, which will be apparent after understanding the disclosure of this application. Additionally, descriptions of features known in the art may be omitted for greater clarity and conciseness.

[0047] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, apparatuses, and / or systems described herein that will be apparent after understanding the disclosure of this application.

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

[0049] As used herein, the phrase "and / or" includes any one of the associated listed items and any combination of any two or more of them.

[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 only used to distinguish one component, part, region, layer, or section from another. Thus, the first component, first part, first region, first layer, or first section referred to in these examples may also be referred to as the second component, second part, second region, second layer, or second section without departing from the teachings of the examples described herein.

[0051] Spatial relative terms such as "above", "upper", "below", and "lower" may be used herein for convenience of description to describe the relationship of one element relative to another as shown in the accompanying drawings. In addition to covering the orientations depicted in the accompanying drawings, these spatial relative terms are intended to also cover different orientations of the device during use or operation. For example, if the device in the accompanying drawings is flipped, an element described as "above" or "upper" relative to another element will be "below" or "lower" relative to that other element. Thus, depending on the spatial orientation of the device, the term "above" covers both the 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 terms used herein are for the purpose of describing various examples only and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the terms "a", "an", and "the" are intended to include the plural forms as well. The terms "comprising", "including", and "having" specify the presence of the stated features, numbers, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, components, elements, and / or combinations thereof.

[0053] In 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, for illustrative purposes, the thickness, size, and shape of the lens may be slightly exaggerated. In addition, the spherical shape or aspherical shape shown in the configuration diagrams is merely an example and is not limited to these shapes.

[0054] In this specification, the front lens or the first lens refers to the lens closest to the object (or subject), and the rear lens or the last lens refers to the lens closest to the imaging surface (or image sensor). In this specification, the units of the radius of curvature, thickness, distance, TTL (distance from the object side of the first lens to the imaging surface), ImgH (or Y, height of the imaging surface), 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 specified, a reference to the shape of a lens surface refers 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 that surrounds and includes the optical axis of the lens surface, in which light rays incident on the lens surface make a small angle θ with the optical axis, and the approximations sinθ≈θ, tanθ≈θ, and cosθ≈1 are valid.

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

[0058] The imaging lens system according to the first embodiment of the present disclosure may include two lens groups. For example, the imaging lens system according to the first embodiment may include a first lens group and a second lens group 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. In addition, the number of lens groups constituting the imaging lens system according to the first embodiment may not be limited to two. For example, the 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. The imaging lens system according to the first embodiment may include an optical path converter. For example, in the imaging lens system according to the first embodiment, the first lens group may include an optical path converter. The imaging lens system according to the first embodiment may include a lens group movable in the optical axis direction. For example, in the imaging lens system according to the first embodiment, the second lens group may be configured to be movable in the optical axis direction. The imaging lens system according to the first embodiment may satisfy a specific conditional expression. For example, the 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 closest to the object side of the optical path converter, and fPR is the focal length of the rear lens disposed closest to the image side of the optical path converter.

[0059] The imaging lens system according to the first embodiment may include one or more of the following features 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 closest to the image side of the optical path converter may have a convex image side surface in its paraxial region.

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

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

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

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

[0066] The imaging lens system according to the third embodiment of the present disclosure may include two lens groups. For example, the imaging lens system according to the third embodiment may include a first lens group and a second lens group 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 lens groups in the imaging lens system according to the third embodiment may not be limited to two. For example, the imaging lens system according to the third embodiment may further include a third lens group disposed on the image side of the second lens group. The imaging lens system according to the third embodiment may include an optical path converter. For example, in the imaging lens system according to the third embodiment, the first lens group may include an optical path converter. The imaging lens system according to the third embodiment may include a lens group movable in the optical axis direction. For example, in the imaging lens system according to the third embodiment, the second lens group may be configured to be movable in the optical axis direction. The imaging lens system according to the third embodiment may include a plurality of lenses having positive refractive power. For example, in the imaging lens system according to the third embodiment, 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 both have positive refractive power.

[0067] The imaging lens system according to the fourth embodiment of the present disclosure may include two lens groups. For example, the imaging lens system according to the fourth embodiment may include a first lens group and a second lens group 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 lens groups constituting the imaging lens system according to the fourth embodiment may not be limited to two. As an example, the imaging lens system according to the fourth embodiment may further include a third lens group disposed on the image side of the second lens group. The imaging lens system according to the fourth embodiment may include an optical path converter. For example, in the imaging lens system according to the fourth embodiment, the first lens group may include an optical path converter. The imaging lens system according to the fourth embodiment may include a lens group movable in the optical axis direction. For example, in the imaging lens system according to the fourth embodiment of the present disclosure, the second lens group may be configured to be movable in the optical axis direction. The imaging lens system according to the fourth embodiment may include a cemented lens. For example, in the imaging lens system according to the fourth embodiment, the rear lens disposed closest to the image side of the optical path converter may be cemented 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 cemented to each other.

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

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

[0070] In the imaging lens system according to the sixth embodiment, since the rear lens closest to the image side of 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 the present disclosure may include a plurality of 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 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. 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 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 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 disposed closest to the object side of the first lens group with respect to the optical path converter, fPR is the focal length of the rear lens disposed closest to the image side of the first lens group with respect to the optical path converter, G1L is the distance along the optical axis from the object side surface of the foremost lens disposed closest to the object in the first lens group to the image side surface of the lens disposed closest to the imaging surface in the first lens group, GL is the distance along the optical axis from the object side surface of the foremost lens to the image side surface of the last lens disposed closest to the imaging surface, BFL is the distance along the optical axis from the image side surface of the last lens to the imaging surface, DG12 is the maximum distance along the optical axis from the image side surface of the lens disposed closest to the second lens group in the first lens group to the object side surface of the lens disposed closest to the first lens group in the second lens group, Gfm is the maximum movement distance along the optical axis of the second lens group or the third lens group between the position where the imaging lens system focuses on an object at infinity and the position where the imaging lens system focuses on an object at the near focus position of the imaging lens system (i.e., at the minimum focusing distance of the imaging lens system), ML is the distance along the optical axis from the reflection surface of the optical path converter to the image side surface of the lens disposed closest to the imaging surface in the first lens group, R1 is the radius of curvature of the object side surface of the front lens disposed closest to the object side of the first lens group with respect to the optical path converter, R4 is the radius of curvature of the image side surface of the rear lens disposed closest to the image side of the first lens group with respect to the optical path converter, Dp is the diagonal length of the reflection surface of the optical path converter, and Mf is the magnification of the imaging lens system when the imaging lens system focuses on an object at infinity.

[0081] The imaging lens system satisfying the conditional expression 1 can maximize the image stabilization effect. For example, an imaging lens system outside the numerical range of the conditional expression 1 may greatly increase aberration and may reduce resolution due to an overly long focal length of the front lens disposed closest to the object side of the first lens group with respect to the optical path converter or an overly long focal length of the rear lens disposed closest to the image side of the first lens group with respect to the optical path converter.

[0082] The imaging lens system satisfying the conditional expression 2 can facilitate miniaturization. For example, in an imaging lens system below the lower limit of the conditional expression 2, it may be difficult to ensure a space where the optical path converter can be disposed, and an imaging lens system exceeding the upper limit of the conditional expression 2 may have a problem of increasing the size or volume of the camera module.

[0083] An imaging lens system that satisfies conditional expression 3 can facilitate miniaturization and correction of the curvature of the imaging surface. For example, an imaging lens system that falls below the lower limit of conditional expression 3 may be advantageous for correction of the curvature of the imaging surface, but is disadvantageous for miniaturization of the imaging lens system and the camera module due to an increase in the aperture of the lens, and an imaging lens system that exceeds the upper limit of conditional expression 3 may have a problem of reduced resolution due to a significant increase in the curvature of the imaging surface.

[0084] An imaging lens system that satisfies conditional expression 4 is advantageous in ensuring a driving space for the image stabilization lens group (first lens group) and a moving space for the focus adjustment lens group (second lens group or third lens group). For example, an imaging lens system that falls below the lower limit of conditional expression 4 may not ensure sufficient driving space for the first lens group for image stabilization of the camera module, and an imaging lens system that exceeds the upper limit of conditional expression 4 may not ensure sufficient moving space for the second lens group (or third lens group) for focus adjustment of the camera module. In addition, in an imaging lens system that falls outside the numerical range of conditional expression 4, aberrations may occur due to a lower refractive power of the second lens group.

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

[0086] Conditional expression 7 is a condition for restricting the size of the optical path converter and the size of the imaging lens system. For example, since the thickness of the first lens group including the optical path converter increases, an imaging lens system that falls below the lower limit of conditional expression 7 may prevent miniaturization of the imaging lens system, and an imaging lens system that exceeds the upper limit of conditional expression 7 may have difficulty ensuring the performance of the imaging lens system because the optical path converter becomes too small.

[0087] An imaging lens system that satisfies conditional expression 8 can achieve a constant resolution. For example, an imaging lens system that falls below the lower limit of conditional expression 8 means that the optical axis of the first lens group significantly deviates from the optical axis of the second lens group, and an imaging lens system that exceeds the upper limit of conditional expression 8 means that the optical axis of the second lens group significantly deviates 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 that falls outside the numerical range of conditional expression 8 may have a problem of significant change 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 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 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 two or more arbitrary combinations 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 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 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 two or more arbitrary combinations 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 help minimize 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 the present 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 the first lens to the seventh lens having the following characteristics. As another example, the imaging lens systems according to the second to seventh embodiments may include one or more of the first lens to the seventh lens having the following characteristics. However, the imaging lens system according to the above embodiments may not necessarily include a lens having the following characteristics. The characteristics of the first lens to the seventh lens will be described below.

[0103] The first lens may have a refractive power. For example, the first lens may have a 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 having a 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 a refractive power. For example, the second lens may have a 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 having a high light transmittance and excellent processability. For example, the second lens may be made of a plastic material or a glass material. 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 a refractive power. For example, the third lens may have a 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 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 processing performance. 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 a refractive power. For example, the fourth lens may have a 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 in its paraxial region. As another example, the fourth lens may have a concave image side in its paraxial region. The fourth lens may include a spherical surface or an 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 processing performance. 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 a refractive power. For example, the fifth lens may have a positive refractive power or a 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 in its paraxial region. The fifth lens may include a spherical surface or an 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 processing performance. 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 a refractive power. For example, the sixth lens may have a positive refractive power or a negative refractive power. The sixth lens may have a convex shape or a concave shape on one surface. As an example, the sixth lens having a positive refractive power may have a convex object side in its paraxial region, or may have a convex image side in its paraxial region. As another example, the sixth lens having a negative refractive power may have a concave object side in its paraxial region, or may have a concave image side in its paraxial region. The sixth lens may include a spherical surface or an aspherical surface. For example, both surfaces of the sixth lens may be aspherical. The sixth lens may be made of a material having a 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 may have a refractive power. For example, the seventh lens may have a negative refractive power. The seventh lens may have a concave shape on one surface. As an example, the seventh lens may have a concave image side in its paraxial region. The seventh lens may include a spherical surface or an aspherical surface. For example, both surfaces of the seventh lens may be aspherical. The seventh lens may be made of a material having a high light transmittance and excellent processability. For example, the seventh lens may be made of a plastic material. The seventh lens may have a predetermined refractive index. As an example, the refractive index of the seventh lens may be greater than 1.6. The seventh lens may have a predetermined Abbe number. For example, the Abbe number of the seventh lens may be greater than 20. As a specific example, the Abbe number of the seventh lens may be greater than 20 and less than 30.

[0110] As described above, the first lens to the seventh lens may include a spherical surface or an aspherical surface. When the first lens to the seventh lens include an aspherical surface, the aspherical surface of the corresponding lens may 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 of the lens surface, k is the conic constant, and r is the distance from an arbitrary point on the aspherical surface of the lens to the optical axis. In addition, the constants A to D are aspherical surface coefficients. Z (also referred to as sagittal) is the distance in the direction parallel to the optical axis between the point at a distance r from the optical axis of the aspherical surface of the lens to the tangent plane perpendicular to the optical axis and intersecting the vertex of the aspherical surface.

[0113] The imaging lens system according to the above-described embodiments or forms may further include a diaphragm and a filter. The diaphragm may be disposed between the third lens and the fourth lens. The filter may be disposed between the last lens (the sixth lens or the seventh lens) and the imaging surface. 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 rays, but the wavelength of the light blocked by the filter is not limited to infrared rays.

[0114] Hereinafter, specific embodiments of the present disclosure will be described in detail based on the drawings.

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

[0116] Referring to Figure 1 , the imaging lens system 100 may include a plurality of 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 sequentially disposed 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 the present embodiment, the prism P is shown as a type of optical path converter, but the optical path converter may also be changed to a mirror.

[0117] The first lens group LG1 may include a first lens 110 and a second lens 120. The first lens 110 may have a 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 a positive refractive power and a convex image side surface in its paraxial region. The second lens 120 may be disposed 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 so that it can be combined 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 a 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 a 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 a 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 a 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 may be mounted in a camera module capable of performing image stabilization and focus adjustment. For example, in the imaging lens system 100, the first lens group LG1 may rotate about an axis intersecting the optical axis as shown in Figure 2 to perform image stabilization, and the second lens group LG2 may move in the optical axis direction as shown in Figure 2 to perform focus adjustment. In the present embodiment, the change in the focal length (f) of the imaging lens system 100 caused by the movement of the second lens group LG2 may be very small. Therefore, even when the focus is adjusted by moving the second lens group LG2, the imaging lens system 100 according to the present embodiment can achieve a resolution of substantially constant quality.

[0120] In addition to the first lens 110 to the sixth lens 160, the imaging lens system 100 may further include other elements. For example, the imaging lens system 100 may further include a diaphragm ST, a filter IF, and an imaging surface IP. The diaphragm 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 a position where an image is formed by light incident through the first lens 110 to the sixth lens 160. For example, the imaging surface IP may be located on one surface of the image sensor IS of the camera module or on a lens element provided inside the image sensor IS.

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

[0122] Table 1 and Table 2 below list the lens characteristics of the imaging lens system 100 according to the present embodiment, and Table 3 below lists the aspherical values of the imaging lens system 100 according to the present 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 the near focus 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] Object at infinity Object at near - focus position 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 is a configuration diagram of an imaging lens system according to a second embodiment of the present disclosure.

[0132] Referring to Figure 4 , the imaging lens system 200 may include a plurality of 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 sequentially arranged 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. As a reference, in the present embodiment, the prism P is shown as a type of optical path converter, but the optical path converter may also be changed to a mirror.

[0133] The first lens group LG1 may include a first lens 210 and a second lens 220. The first lens 210 may have a 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 a positive refractive power and a convex image side surface in its paraxial region. The second lens 220 may be disposed 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 so that it can be combined 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 a 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 a 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 a 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 a 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 may be mounted in a camera module capable of performing image stabilization and focus adjustment. For example, in the imaging lens system 200, the first lens group LG1 may rotate about an axis intersecting the optical axis as shown in Figure 5 to perform image stabilization, and the second lens group LG2 may move in the optical axis direction as shown in Figure 5 to perform focus adjustment. In the present embodiment, the change in the focal length (f) of the imaging lens system 200 caused by the movement of the second lens group LG2 may be very small. Therefore, even when the focus is adjusted by moving the second lens group LG2, the imaging lens system 200 according to the present embodiment can achieve a resolution of substantially constant quality.

[0137] In addition to the first lens 210 to the sixth lens 260, the imaging lens system 200 may further include other elements. For example, the imaging lens system 200 may further include a diaphragm ST, a filter IF, and an imaging surface IP. The diaphragm 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 a position where an image is formed by light incident through the first lens 210 to the sixth lens 260. For example, the imaging surface IP may be located on one surface of the image sensor IS of the camera module or on a lens element provided inside the image sensor IS.

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

[0139] Tables 4 and 5 below list the lens characteristics of the imaging lens system 200 according to the present embodiment, and Table 6 below lists the aspherical surface values of the imaging lens system 200 according to the present 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 the near focus 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] Object at infinity Object at near - focus position 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 is a configuration diagram of the imaging lens system according to the third embodiment.

[0149] Referring to Figure 7 , the imaging lens system 300 may include a plurality of 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 sequentially arranged 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. As a reference, in the present embodiment, the prism P is shown as a type of optical path converter, but the optical path converter may also be changed to a mirror.

[0150] The first lens group LG1 may include a first lens 310 and a second lens 320. The first lens 310 may have a 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 a positive refractive power and a convex image side surface in its paraxial region. The second lens 320 may be disposed 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 so that it can be bonded to 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 a 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 a 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 a 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 a 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 may be mounted in a camera module capable of performing image stabilization and focus adjustment. For example, in the imaging lens system 300, the first lens group LG1 may rotate about an axis intersecting the optical axis as shown in Figure 8 to perform image stabilization, and the third lens group LG3 may move in the optical axis direction as shown in Figure 8 to perform focus adjustment. In the present embodiment, the change in the focal length (f) of the imaging lens system 300 caused by the movement of the third lens group LG3 may be very small. Therefore, even when the focus is adjusted by moving the third lens group LG3, the imaging lens system 300 according to the present embodiment can achieve a resolution of substantially constant quality.

[0154] In addition to the first lens 310 to the sixth lens 360, the imaging lens system 300 may further include other elements. For example, the imaging lens system 300 may further include a diaphragm ST, a filter IF, and an imaging surface IP. The diaphragm 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 a position where an image is formed by light incident through the first lens 310 to the sixth lens 360. For example, the imaging surface IP may be located on one surface of the image sensor IS of the camera module or on a lens element disposed inside the image sensor IS.

[0155] Figure 9 Shows the aberration characteristics of the imaging lens system 300 according to the present embodiment.

[0156] The following Table 7 and Table 8 list the lens characteristics of the imaging lens system 300 according to the present embodiment, and the following Table 9 lists the aspherical values of the imaging lens system 300 according to the present 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 the near focus 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] Object at infinity Object at near - focus position 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 are configuration diagrams of an imaging lens system according to a fourth embodiment of the present disclosure.

[0166] Refer to Figure 10 , the imaging lens system 400 may include a plurality of 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 sequentially arranged 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 the present embodiment, the prism P is shown as a type of optical path converter, but the optical path converter may also be changed to a mirror.

[0167] The first lens group LG1 may include a first lens 410 and a second lens 420. The first lens 410 may have a 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 a positive refractive power and a convex image side surface in its paraxial region. The second lens 420 may be disposed 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 so as to be combined 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 a 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 a 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 a 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 a 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 a 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 may be mounted in a camera module capable of performing image stabilization and focus adjustment. For example, in the imaging lens system 400, the first lens group LG1 may rotate about an axis intersecting the optical axis as shown in Figure 11 to perform image stabilization, and the second lens group LG2 may be as shown in Figure 11 It moves in the optical axis direction as shown to perform focus adjustment. In the present embodiment, the change in the 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 the focus is adjusted by moving the second lens group LG2, the imaging lens system 400 according to the present embodiment can achieve a resolution of substantially constant quality.

[0170] In addition to the first lens 410 to the seventh lens 470, the imaging lens system 400 may further include other elements. For example, the imaging lens system 400 may further include a diaphragm ST, a filter IF, and an imaging surface IP. The diaphragm 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 a position where an image is formed by the light incident through the first lens 410 to the seventh lens 470. For example, the imaging surface IP may be located on one surface of the image sensor IS of the camera module or on a lens element provided inside the image sensor IS.

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

[0172] The following Table 10 and Table 11 list the lens characteristics of the imaging lens system 400 according to the present embodiment, and the following Table 12 lists the aspherical values of the imaging lens system 400 according to the present 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 the near focus 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] Object at infinity Object at near - focus position 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 is a configuration diagram of an imaging lens system according to a fifth embodiment of the present disclosure.

[0182] Reference Figure 13 , the imaging lens system 500 may include a plurality of 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 sequentially arranged 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 the present embodiment, the prism P is shown as a type of optical path converter, but the optical path converter may also be changed to a mirror.

[0183] The first lens group LG1 may include a first lens 510 and a second lens 520. The first lens 510 may have a 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 a positive refractive power and a convex image side surface in its paraxial region. The second lens 520 may be disposed 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 so that it can be combined 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 a 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 include a 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 include a 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 include a 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 a 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 may be mounted in a camera module capable of performing image stabilization and focus adjustment. For example, in the imaging lens system 500, the first lens group LG1 may be rotated about an axis intersecting the optical axis as shown in Figure 14 to perform image stabilization, and the second lens group LG2 may be as shown in Figure 14 It moves in the optical axis direction as shown in Figure 14 to perform focus adjustment. In the present embodiment, the change in the 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 if the focus is adjusted by moving the second lens group LG2, the imaging lens system 500 according to the present embodiment can achieve a resolution of substantially constant quality.

[0186] In addition to the first lens 510 to the seventh lens 570, the imaging lens system 500 may further include other elements. For example, the imaging lens system 500 may further include a diaphragm ST, a filter IF, and an imaging surface IP. The diaphragm 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 a position where an image is formed by light incident through the first lens 510 to the seventh lens 570. For example, the imaging surface IP may be located on one surface of the image sensor IS of the camera module or on a lens element provided inside the image sensor IS.

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

[0188] Tables 13 and 14 below list the lens characteristics of the imaging lens system 500 according to the present embodiment, and Table 15 below lists the aspherical values of the imaging lens system 500 according to the present 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 the near focus 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] Object at infinity Object at near - focus position 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 lens to the sixth lens or the first lens to the seventh lens of the imaging lens system according to the first embodiment to the fifth embodiment.

[0198] Table 16

[0199] First embodiment Second embodiment Third embodiment Fourth embodiment Fifth embodiment 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 the examples of the first to fifth embodiments, the imaging lens system according to the present disclosure may have specific lens characteristics. For example, the focal length of the first lens may be in the range of 30 mm to 70 mm, the focal length of the second lens may be in the range of 12.0 mm to 18.0 mm, the focal length of the third lens may be in the range of 8.0 mm to 20 mm, the focal length of the fourth lens may be in the range of -8.0 mm to -3.0 mm, the focal length of the fifth lens may be in the range of 4.0 mm to 6.0 mm or less than -30 mm, the focal length of the sixth lens may be in the range of 4.0 mm to 8.0 mm or -10 mm to -6.0 mm, and the focal length of the seventh lens may be in the range of -12 mm to -8.0 mm.

[0201] The following Tables 17 and 18 list the conditional expression values of the imaging lens system according to the first to fifth embodiments.

[0202] Table 17

[0203]

[0204] Table 18

[0205]

[0206] Although the present disclosure includes specific examples, it will be apparent after understanding the present disclosure of the present application that various changes in form and detail can be made to these examples without departing from the spirit and scope of the claims and their equivalents. The description of the features or aspects in each example should be considered applicable to similar features or aspects in other examples. Appropriate results can still be achieved if the described techniques are performed in a different order, and / or if the components in the described system, architecture, device, or circuit are combined in a different way and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of the present 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 the present disclosure.

Claims

1. Imaging lens system, including: A first lens group, including one or more lenses and an optical path converter; as well as A 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 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 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 closest to the object side of the optical path converter, and fPR is the focal length of the rear lens of the first lens group disposed closest to the image side of the optical path converter, and The imaging lens system has six or seven lenses in total.

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

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

4. The imaging lens system according to claim 1, wherein: A frontmost lens of the second lens group, which is disposed closest to the image side of the rear lens of the first lens group, has a convex image-side surface in its paraxial region.

5. The imaging lens system according to claim 1, wherein: The last lens of the second lens group, which is disposed closest to the imaging plane, has a concave object-side surface in its paraxial region.

6. The imaging lens system according to claim 1, wherein: The last lens of the second lens group, which is disposed closest to the imaging plane, has a concave image-side surface in its paraxial region.

7. The imaging lens system according to claim 1, wherein: 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 reflection 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, wherein: 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 reflection 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. Imaging lens system, comprising: 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, which 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, Wherein, the imaging lens system satisfies the following conditional expression: 1.60 <f1 / f<3.60 Wherein, 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, and The imaging lens system has six lenses in total.

10. The imaging lens system according to claim 9, wherein: The first lens has a convex object-side surface in a paraxial region thereof.

11. The imaging lens system according to claim 9, wherein: The first lens has a concave image-side surface in a paraxial region thereof.

12. The imaging lens system according to claim 9, wherein: The second lens has a flat object-side surface joined to the image-side surface of the optical path converter.

13. The imaging lens system according to claim 9, wherein: The third lens has a convex image-side surface in a paraxial region thereof.

14. The imaging lens system according to claim 9, wherein: The fourth lens has a concave object-side surface in a paraxial region thereof.

15. The imaging lens system according to claim 9, wherein: The fourth lens has a concave image-side surface in a paraxial region thereof.

16. The imaging lens system according to claim 9, wherein: The fifth lens has a convex object-side surface in a paraxial region thereof.

17. An imaging lens system, comprising: A first lens having positive refractive power and a convex object-side surface in a paraxial region thereof; Optical path converter; a second lens having positive refractive power and a convex image-side surface in a paraxial region thereof; a third lens having refractive power and a concave object-side surface in a paraxial region thereof; The fourth lens has a refractive power; a fifth lens having refractive power; as well as a sixth lens having a refractive power and a concave image side surface in a paraxial region thereof, The first lens, the optical path converter, the second lens, the third lens, the fourth lens, the fifth lens and the 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. The first to sixth lenses each have a single refractive index and are lenses having 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 a first lens group, The third lens to the sixth lens are included in a second lens group configured to be movable along the optical axis to adjust the focus of the imaging lens system; or the third lens and the fourth lens are included in a second lens group configured to be movable along the optical axis to adjust the focus of the imaging lens system and the fifth lens and the sixth lens are included in the third lens group; or the third lens and the fourth lens are included in the second lens group and the fifth lens and the sixth lens are included in the third lens group configured to be movable along the optical axis to adjust the focus of the imaging lens system, and The imaging lens system has six lenses in total.

18. The imaging lens system according to claim 17, wherein: The second lens has a flat object-side surface joined to the image-side surface of the optical path converter.

19. The imaging lens system according to claim 17, wherein: The first lens group is configured to be rotatable about an axis perpendicular to the optical axis to perform image stabilization.

20. The imaging lens system of claim 17, wherein: 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 from the object-side surface of the first lens to the image-side surface of the second lens along the optical axis, and Dp is the diagonal length of the reflective surface of the optical path converter.

21. The imaging lens system of claim 17, wherein: The imaging lens system satisfies the following conditional expression: 1.50≤fPF / fPR≤6.50 Wherein, fPF is the focal length of the first lens, and fPR is the focal length of the second lens.

22. The imaging lens system of claim 17, wherein: The imaging lens system satisfies the following conditional expression: 1.60 <f1 / f<3.60 Wherein, 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 comprising: A first lens having positive refractive power and a convex object-side surface in a paraxial region thereof; Optical path converter; a second lens having positive refractive power and a convex image-side surface in a paraxial region thereof; a third lens having refractive power and a convex object-side surface in a paraxial region thereof; The fourth lens has a refractive power; a fifth lens having refractive power; a sixth lens having refractive power; and a seventh lens having refractive power and a concave image-side surface in a paraxial region thereof, 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 to seventh lenses each have a single refractive index and are lenses having refractive power in the imaging lens system, The third to seventh 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 a first lens group, The third to seventh lenses are included in a 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, and The imaging lens system has seven lenses in total.

24. The imaging lens system of claim 23, wherein: The second lens has a flat object-side surface joined to the image-side surface of the optical path converter.

25. The imaging lens system of claim 23, wherein: The first lens group is configured to be rotatable about an axis perpendicular to the optical axis to perform image stabilization.

26. The imaging lens system of claim 23, wherein: 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 from the object-side surface of the first lens to the image-side surface of the second lens along the optical axis, and Dp is the diagonal length of the reflective surface of the optical path converter.

27. The imaging lens system of claim 23, wherein: The imaging lens system satisfies the following conditional expression: 1.50≤fPF / fPR≤6.50 Wherein, fPF is the focal length of the first lens, and fPR is the focal length of the second lens.

28. The imaging lens system of claim 23, wherein: The imaging lens system satisfies the following conditional expression: 1.60 <f1 / f<3.60 Wherein, 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