Imaging lens system

Abstract

The present disclosure relates to an imaging lens system. The imaging lens system includes, disposed in order from an object side, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. At least one of the first lens to the fifth lens is a metamaterial lens.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2025-0032003, filed on March 12, 2025, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. Technical Field

[0003] This disclosure relates to imaging lens systems that enable thinning. Background Technology

[0004] Portable electronic devices may include camera modules for capturing still images or recording moving images. For example, camera modules can be installed in mobile phones, laptops, game consoles, etc. Portable electronic devices are typically manufactured in a slim or compact form to enhance user portability. However, camera modules that include multiple lenses are difficult to make thin due to the convex or concave shapes of the lenses. Furthermore, camera modules including lenses with convex and concave shapes inevitably introduce chromatic aberration due to the lens shape, making aberration correction difficult.

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

[0006] The summary portion of this invention is intended to provide a brief overview of the chosen concepts, which will be further described in the detailed description portion below. This summary portion is not intended to identify key or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

[0007] In a general sense, the imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially from the object side. At least one of the first to fifth lenses is a metalens.

[0008] Metalenses can have positive refractive power.

[0009] The first or second lens can be a meta-lens.

[0010] The fourth lens can be a meta-lens.

[0011] At least one of the first to fifth lenses may have negative refractive power.

[0012] Each pair of adjacent lenses among the first to fifth lenses can have positive refractive power.

[0013] One of the second to fourth lenses can have negative refractive power.

[0014] Metalenses may include a first region corresponding to the blue light wavelength, a second region corresponding to the green light wavelength, a third region corresponding to the red light wavelength, and a fourth region corresponding to the green light wavelength.

[0015] The first and second regions can be symmetrical about the optical axis with respect to the third and fourth regions, respectively.

[0016] In another general aspect, the imaging lens system includes a lens group disposed between the object and the imaging plane, wherein the lens group includes at least one metalens.

[0017] The lens group may include lenses with negative refractive power.

[0018] The imaging lens system can satisfy the following conditional expression: 0.60 < TTL / 2Y < 0.80, where TTL is the distance from the object side of the foremost lens in the lens group to the imaging plane, and 2Y is the diagonal length of the imaging plane.

[0019] An imaging lens system can satisfy the following conditional expression: 0.2 < BFL / f < 0.8, where BFL is the distance from the image side of the last lens in the lens group to the imaging plane, and f is the focal length of the imaging lens system.

[0020] Other features and aspects will become apparent from the following detailed description and accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a configuration diagram of an imaging lens system (based on red light wavelength) according to a first exemplary embodiment.

[0022] Figure 2 yes Figure 1 The aberration curves of the imaging lens system are shown.

[0023] Figure 3 This is a configuration diagram of an imaging lens system (based on green light wavelength) according to a first exemplary embodiment.

[0024] Figure 4 yes Figure 3 The aberration curves of the imaging lens system are shown.

[0025] Figure 5 This is a configuration diagram of an imaging lens system (based on blue light wavelength) according to a first exemplary embodiment.

[0026] Figure 6 yes Figure 5 The aberration curves of the imaging lens system are shown.

[0027] Figures 7 to 9 This is a configuration diagram of a meta-lens according to exemplary and modified examples.

[0028] Figure 10 yes Figure 1 , Figure 3 or Figure 5 The diagram shows the configuration of the image sensor.

[0029] Figure 11 This is a configuration diagram of an imaging lens system (based on red light wavelength) according to a second exemplary embodiment.

[0030] Figure 12 yes Figure 11 The aberration curves of the imaging lens system are shown.

[0031] Figure 13 This is a configuration diagram of an imaging lens system (based on green light wavelength) according to a second exemplary embodiment.

[0032] Figure 14 yes Figure 13 The aberration curves of the imaging lens system are shown.

[0033] Figure 15 This is a configuration diagram of an imaging lens system (based on blue light wavelength) according to a second exemplary embodiment.

[0034] Figure 16 yes Figure 15 The aberration curves of the imaging lens system are shown.

[0035] Figure 17 This is a configuration diagram of an imaging lens system (based on red light wavelength) according to a third exemplary embodiment.

[0036] Figure 18 yes Figure 17 The aberration curves of the imaging lens system are shown.

[0037] Figure 19 This is a configuration diagram of an imaging lens system (based on green light wavelength) according to a third exemplary embodiment.

[0038] Figure 20 yes Figure 19 The aberration curves of the imaging lens system are shown.

[0039] Figure 21 This is a configuration diagram of an imaging lens system (based on blue light wavelength) according to a third exemplary embodiment.

[0040] Figure 22 yes Figure 21The aberration curves of the imaging lens system are shown.

[0041] Throughout the accompanying drawings and detailed embodiments, unless otherwise described, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative dimensions, scale, and depiction of elements in the drawings may be exaggerated. Detailed Implementation

[0042] In the following description, although examples of this disclosure will be described in detail with reference to the accompanying drawings, it should be noted that the examples are not limited thereto.

[0043] The following detailed embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein, except for operations that must occur in a specific order, as will become apparent upon understanding this disclosure. Furthermore, for clarity and brevity, descriptions of features well-known in the art may be omitted.

[0044] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein are provided merely to illustrate some of the many possible ways in which the methods, apparatuses, and / or systems described herein will be apparent upon understanding this disclosure.

[0045] Throughout this specification, when an element such as a layer, region, or substrate is described as being "on," "connected to," or "attached to" another element, the element may be directly "on," directly "connected to," or directly "attached to" the other element, or there may be one or more other elements between the element and the other element. Conversely, when an element is described as being "directly on," "directly connected to," or "directly attached to" another element, there are no other elements between the element and the other element.

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

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

[0048] Spatial relative terms such as “above,” “above,” “below,” and “under” may be used herein for descriptive convenience to describe the relationship of one element relative to another, as shown in the accompanying drawings. In addition to covering the orientation depicted in the drawings, these spatial relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “above” another element would be located “below” or “under” that other element. Thus, depending on the spatial orientation of the device, the term “above” covers both orientations of “above” and “below”. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0049] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the terms “a,” “an,” and “the” are intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

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

[0051] It should be noted that in this document, the term "may" is used relative to examples, such as regarding what an example may include or implement, meaning that there exists at least one example that includes or implements such a feature, but not all examples are limited to this.

[0052] In the following description of this disclosure, the terms used to refer to the components of this disclosure will be named based on considerations of their function. Therefore, these terms should not be construed as limiting the technical components of this disclosure.

[0053] The features of the examples described herein can be combined in various ways that will become apparent upon understanding this disclosure. Furthermore, although the examples described herein have multiple configurations, other configurations that will become apparent upon understanding this disclosure are also possible.

[0054] One aspect of this disclosure is to provide an imaging lens system that enables the thinning of camera modules.

[0055] One aspect of this disclosure is to provide an imaging lens system capable of correcting chromatic aberration in a camera module.

[0056] One aspect of this disclosure is to provide an imaging lens system capable of improving the multicolor light transmittance of a camera module.

[0057] In this specification, the foremost lens or first lens refers to the lens closest to the object (or subject), and the last lens or fifth lens refers to the lens closest to the imaging plane (or image sensor). In this specification, the radius of curvature, thickness, total track length (TTL: distance from the object-side surface of the first lens to the imaging plane), ImgHT (or Y: height of the imaging plane), and focal length of the lens are expressed in millimeters (mm). ImgHT is also shown as IMG HT in the accompanying drawings.

[0058] The lens thickness, the inter-lens spacing, and the TTL (Time to Light) are distances along the optical axis of the lens. Furthermore, in the description of the lens shape, a convex surface of the lens can indicate that the paraxial region of the corresponding surface is convex, and a concave surface of the lens can indicate that the paraxial region of the corresponding surface is concave. Therefore, although a surface of the lens is described as convex, the edge portion of that surface may be concave. Similarly, although a surface of the lens is described as concave, the edge portion of that surface may be convex.

[0059] The imaging lens system according to this disclosure can be installed in all kinds and types of camera devices. For example, the imaging lens system can be installed in mobile terminals, laptop computers, or camera devices used for virtual reality (VR) devices. However, the types of camera devices in which the imaging lens system according to this disclosure can be installed are not limited to the devices described above. For example, the imaging lens system can also be installed in camera devices configured in vehicles for front and rear monitoring or for autonomous driving.

[0060] An imaging lens system according to a first aspect of this disclosure may include a plurality of lenses. For example, an imaging lens system according to this aspect may include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially from the object side. However, the configuration of the imaging lens system according to this aspect is not limited to the first to fifth lenses. An imaging lens system according to this aspect may include at least one metalens. For example, at least one of the first to fifth lenses may be a metalens.

[0061] The imaging lens system according to a second aspect of this disclosure may include a lens group comprising at least one metalens. For example, the lens group according to this aspect may include five lenses, and at least one of the five lenses may be a metalens. In the imaging lens system according to this aspect, the lens group may be positioned between the object and the imaging surface. More specifically, the lens group according to this aspect may be positioned at a predetermined distance from the imaging surface.

[0062] An imaging lens system according to a third aspect of this disclosure may include at least one metalens. For example, an imaging lens system according to this aspect may include at least two metalenses. An imaging lens system according to this aspect may include metalenses having a specific form. For example, a metalens according to this aspect may include a first region corresponding to a blue light wavelength, a second region corresponding to a green light wavelength, a third region corresponding to a red light wavelength, and a fourth region corresponding to a green light wavelength, arranged sequentially in a clockwise or counterclockwise direction.

[0063] The imaging lens system according to the fourth aspect of this disclosure may include at least one metalens. For example, the imaging lens system according to this aspect may include at least two metalenses. The imaging lens system according to this aspect may include metalenses having a specific form. For example, the metalens according to this aspect may include a first region corresponding to a blue light wavelength, a second region corresponding to a green light wavelength, and a third region corresponding to a red light wavelength. Furthermore, the metalens according to this aspect may also include specific regions. For example, in the metalens according to this aspect, the second region corresponding to a green light wavelength may be larger than the first region corresponding to a blue light wavelength. In another example, in the metalens according to this aspect, the second region corresponding to a green light wavelength may be larger than the third region corresponding to a red light wavelength. In yet another example, in the metalens according to this aspect, the second region corresponding to a green light wavelength may be equal to or greater than the sum of the first and third regions.

[0064] The imaging lens system according to the fifth aspect of this disclosure can satisfy at least one of the following conditional expressions: -4.0 < f1 / f < 12.0 -6.0 < f2 / f < 1.20 -6.0 < f3 / f < 50 -1.0 < f4 / f < 2.0 -1.0 < f5 / f < 7.0 0.90 < TTL / f < 1.30 -8.0 < f1 / f2 < 15 -1.0 < f2 / f3 < 1.0 0.2 < BFL / f < 0.8 0.60 < TTL / 2Y < 0.80.

[0065] In the above conditional expressions, f represents the focal length of the imaging lens system, f1 represents the focal length of the first lens, f2 represents the focal length of the second lens, f3 represents the focal length of the third lens, f4 represents the focal length of the fourth lens, f5 represents the focal length of the fifth lens, TTL represents the distance from the object side of the first lens (or the foremost lens in the lens group) to the imaging plane, back focal length (BFL) represents the distance from the image side of the fifth lens (or the last lens in the lens group) to the imaging plane, and 2Y (or 2ImgHT) represents the diagonal length of the imaging plane.

[0066] The above conditional expression can represent the numerical range of the refractive power of the first to fifth lenses and the dimensions of the imaging lens system in the optical axis direction for optimizing these parameters.

[0067] The imaging lens system according to the sixth aspect of this disclosure can satisfy at least one of the following conditional expressions: 0.40 < fM / f < 12 0.40 < fMg / f < 12 -0.80 < MS1 < -0.10 0.080 < MS2 < 0.60 0.60 < |f12 / f2| < 3.0 0.40 < f34 / f < 1.60.

[0068] In the above conditional expressions, fM represents the focal length of the foremost metalens, which is set to be closest to the object, in the lens group (or the first to fifth lenses) included in the imaging lens system; fMg represents the focal length of the foremost metalens at the green light wavelength; MS1 represents the second-order coefficient of the phase function on the object side of the foremost metalens; MS2 represents the second-order coefficient of the phase function on the image side of the foremost metalens; f12 represents the combined focal length of the first and second lenses; and f34 represents the combined focal length of the third and fourth lenses.

[0069] The above conditional expression can represent the numerical range of the refractive power of the foremost superlens and the refractive power of the first to fourth lenses.

[0070] The imaging lens system according to the seventh aspect of this disclosure may include at least two features of the imaging lens system according to the aforementioned aspects. For example, the imaging lens system according to this aspect may include the features of the first aspect and satisfy at least one of the conditional expressions according to the fifth or sixth aspect. In another example, the imaging lens system according to this aspect may include at least one of the features of the second to fourth aspects and satisfy at least one of the conditional expressions according to the fifth or sixth aspect.

[0071] The imaging lens system according to this specification may, as needed, include at least one lens having the following characteristics. For example, the imaging lens system according to the first aspect may include one of a first lens to a fifth lens having the following characteristics. In another example, the imaging lens system according to the second to seventh aspects may include at least one of a first lens to a fifth lens having the following characteristics. However, the imaging lens system according to the above aspects is not necessarily required to include a lens having the following characteristics. The characteristics of the first lens to the fifth lens will be described below.

[0072] The first lens has refractive power. For example, the first lens can have positive or negative refractive power. The first lens can have a predetermined refractive index. For example, the refractive index of the first lens can be greater than 1.4. In a specific example, the refractive index of the first lens can be greater than 1.4 and less than 1.6. The first lens can have a predetermined Abbe number. For example, the Abbe number of the first lens can be 50 or greater.

[0073] The second lens has refractive power. For example, the second lens can have positive or negative refractive power. The second lens can have a predetermined refractive index and a predetermined Abbe number. For example, the refractive index of the second lens can be greater than 1.4, and the Abbe number of the second lens can be greater than 20. In a specific example, when the second lens has positive refractive power, the refractive index of the second lens can be 1.4 or greater, and the Abbe number of the second lens can be 60 or greater. In another example, when the second lens has negative refractive power, the refractive index of the second lens can be 1.6 or greater, and the Abbe number of the second lens can be less than 30.

[0074] The third lens has refractive power. For example, the third lens can have positive or negative refractive power. The third lens can have a predetermined refractive index. For example, the refractive index of the third lens can be greater than 1.4. In a specific example, the refractive index of the third lens can be greater than 1.4 and less than 1.6. The third lens can have a predetermined Abbe number. For example, the Abbe number of the third lens can be 50 or greater.

[0075] The fourth lens has refractive power. For example, the fourth lens can have positive or negative refractive power. The fourth lens can have a predetermined refractive index. For example, the refractive index of the fourth lens can be greater than 1.4. In a specific example, the refractive index of the fourth lens can be greater than 1.4 and less than 1.6. The fourth lens can have a predetermined Abbe number. For example, the Abbe number of the fourth lens can be 50 or greater.

[0076] The fifth lens has refractive power. For example, the fifth lens can have positive or negative refractive power. The fifth lens can have a predetermined refractive index. For example, the refractive index of the fifth lens can be greater than 1.4. In a specific example, the refractive index of the fifth lens can be greater than 1.4 and less than 1.6. The fifth lens can have a predetermined Abbe number. For example, the Abbe number of the fifth lens can be 50 or greater.

[0077] At least one of the first through fifth lenses may be a metalens. For example, the first or second lens may be a metalens. In another example, the fourth lens may be a metalens. The metalens among the first through fifth lenses may include unique features. For example, the metalens among the first through fifth lenses may have positive refractive power.

[0078] Metalenses can include nanostructures. For example, a metalens can include a nanostructure, a bandpass filter, and a substrate. The nanostructure can transmit light in a specific wavelength band. The nanostructure can be arranged in a first direction and a second direction intersecting the optical axis. The nanostructure can have a shape such as a polygonal prism or cylinder with a predetermined height and cross-sectional area. However, the shape of the nanostructure is not limited to a polygonal prism or cylinder.

[0079] At least one of the first to fifth lenses or the second to fourth lenses in a lens group included in an imaging lens system may have negative refractive power. For example, the first lens may have negative refractive power. In another example, the second lens may have negative refractive power. A pair of adjacent lenses among the first to fifth lenses may have positive refractive power. For example, both the first and second lenses may have positive refractive power. In another example, both the second and third lenses may have positive refractive power. In yet another example, both the third and fourth lenses may have positive refractive power.

[0080] Each of the first through fifth lenses may have a spherical or aspherical shape as needed. The aspherical shape of each of the first through fifth lenses can be represented by Equation 1.

[0081] [Equation 1]

[0082] 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 quadratic constant, r is the distance from any point on the lens surface to the optical axis of the lens surface in the direction perpendicular to the optical axis of the lens surface, A to H and J are aspherical constants, and Z (also known as SAG) is the distance from a point on the lens surface at a distance r from the optical axis of the lens surface in the direction parallel to the optical axis of the lens surface to a tangent plane perpendicular to the optical axis and intersecting the vertex of the lens surface.

[0083] The imaging lens system according to the exemplary embodiments or aspects described above may further include a filter. The filter may be disposed between the final lens (fifth lens) and the imaging plane. The filter may block light of a specific wavelength. For reference, the filter described herein may block infrared light, and the wavelength of light blocked by the filter is not limited to infrared light.

[0084] In the following, specific exemplary embodiments of the imaging lens system according to the present disclosure will be described with reference to the accompanying drawings.

[0085] First, refer to Figures 1 to 10 An imaging lens system according to a first exemplary embodiment is described.

[0086] Imaging lens system 100 may include a lens group. For example, imaging lens system 100 may include a lens group disposed between an object and an imaging plane IP. The lens group may include at least one lens. For example, the lens group of imaging lens system 100 may include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, and a fifth lens 150.

[0087] Each of the first lens 110 to the fifth lens 150 may have a predetermined refractive power. For example, the first lens 110 may have positive refractive power, the second lens 120 may have positive refractive power, the third lens 130 may have negative refractive power, the fourth lens 140 may have positive refractive power, and the fifth lens 150 may have negative refractive power.

[0088] The imaging lens system 100 may include at least one metalens. For example, in the imaging lens system 100 according to this exemplary embodiment, the first lens 110 to the fifth lens 150 may all be metalenses. The first lens 110 to the fifth lens 150, which are all metalenses, may have a substantially planar object-side side and an image-side side.

[0089] Each of the meta-lenses 110, 120, 130, 140, and 150 can have a unique form. For example, as... Figures 7 to 9As shown, each of the meta-lenses 110, 120, 130, 140, and 150 can be formed into a quadrilateral shape (e.g., a rectangular shape) or a circular shape. However, the meta-lenses 110, 120, 130, 140, and 150 are not limited to this. Figures 7 to 9 The form shown.

[0090] Each of the metalenses 110, 120, 130, 140, and 150 can be divided into multiple regions. For example, each of the metalenses 110, 120, 130, 140, and 150 may include a first region 12 corresponding to a blue light wavelength, a second region 14 corresponding to a green light wavelength, a third region 16 corresponding to a red light wavelength, and a fourth region 18 corresponding to a green light wavelength. The first region 12 corresponding to a blue light wavelength, the second region 14 corresponding to a green light wavelength, the third region 16 corresponding to a red light wavelength, and the fourth region 18 corresponding to a green light wavelength can be arranged in a predetermined manner. For example, the first region 12 corresponding to a blue light wavelength, the second region 14 corresponding to a green light wavelength, the third region 16 corresponding to a red light wavelength, and the fourth region 18 corresponding to a green light wavelength can be formed sequentially around the optical axis in a clockwise or counterclockwise direction. In another example, the first region 12 corresponding to the blue light wavelength can be symmetrically arranged with the third region 16 corresponding to the red light wavelength about the optical axis, and the second region 14 corresponding to the green light wavelength can be symmetrically arranged with the fourth region 18 corresponding to the green light wavelength about the optical axis.

[0091] The imaging lens system 100 may include a filter IF and an imaging surface IP. The filter IF may be disposed between the fifth lens 150 and the imaging surface IP. The imaging surface IP may be formed on the image sensor 900.

[0092] The image sensor 900 according to this exemplary embodiment may have features similar to those of the metalenses 110, 120, 130, 140, and 150. For example, as Figure 10As shown, the image sensor 900 can be divided into multiple regions. In a specific example, the image sensor 900 may include a first region 910 corresponding to a blue light wavelength, a second region 920 corresponding to a green light wavelength, a third region 930 corresponding to a red light wavelength, and a fourth region 940 corresponding to a green light wavelength. The first region 910, the second region 920, the third region 930, and the fourth region 940 can be arranged in a predetermined manner. For example, the first region 910, the second region 920, the third region 930, and the fourth region 940 can be sequentially formed around the optical axis in a clockwise or counterclockwise direction. In another example, the first region 910 corresponding to a blue light wavelength can be symmetrically arranged with respect to the third region 930 corresponding to a red light wavelength about the optical axis, and the second region 920 corresponding to a green light wavelength can be symmetrically arranged with respect to the fourth region 940 corresponding to a green light wavelength about the optical axis.

[0093] The first region 910 corresponding to the blue light wavelength, the second region 920 corresponding to the green light wavelength, the third region 930 corresponding to the red light wavelength, and the fourth region 940 corresponding to the green light wavelength of the image sensor 900 can respectively converge the light emitted from the first region 12 to the fourth region 18 of the metalenses 110, 120, 130, 140, and 150. For example, the first region 910 of the image sensor 900 corresponding to the blue light wavelength can image the light refracted by the first region 12 of the metalenses 110, 120, 130, 140 and 150; the second region 920 and the fourth region 940 of the image sensor 900 corresponding to the green light wavelength can image the light refracted by the second region 14 and the fourth region 18 of the metalenses 110, 120, 130, 140 and 150; and the third region 930 of the image sensor 900 corresponding to the red light wavelength can image the light refracted by the third region 16 of the metalenses 110, 120, 130, 140 and 150.

[0094] The imaging lens system 100 configured as described above can achieve clear imaging by converging light of blue, green, and red wavelengths, respectively, through at least one of the metalenses 110, 120, 130, 140, and 150. Furthermore, the imaging lens system 100 according to this exemplary embodiment includes thin metalenses 110, 120, 130, 140, and 150, thereby significantly reducing the size of the imaging lens system 100.

[0095] Figure 2 , Figure 4 and Figure 6Aberration characteristics of the imaging lens system 100 according to this exemplary embodiment are shown. Tables 1 to 3 show the lens characteristics of the imaging lens system 100 according to this exemplary embodiment, and Tables 4 to 6 show the phase function values ​​of the imaging lens system 100 according to this exemplary embodiment.

[0096] [Table 1]

[0097] [Table 2]

[0098] [Table 3]

[0099] [Table 4]

[0100] [Table 5]

[0101] [Table 6]

[0102] In the following text, reference will be made to Figures 11 to 16 An imaging lens system according to a second exemplary embodiment is described.

[0103] Imaging lens system 200 may include a lens group. For example, imaging lens system 200 may include a lens group disposed between the object and the imaging plane IP. The lens group may include at least one lens. For example, the lens group of imaging lens system 200 may include a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, and a fifth lens 250.

[0104] Each of the first lens 210 to the fifth lens 250 may have a predetermined refractive power. For example, the first lens 210 may have negative refractive power, the second lens 220 may have positive refractive power, the third lens 230 may have positive refractive power, the fourth lens 240 may have negative refractive power, and the fifth lens 250 may have positive refractive power.

[0105] Each of the first lens 210 and the third lens 230 may have a surface that is either convex or concave. For example, the first lens 210 may have a convex object-side surface and a concave image-side surface, and the third lens 230 may have a convex object-side surface and a convex image-side surface.

[0106] The imaging lens system 200 may include at least one metalens. For example, in the imaging lens system 200 according to this exemplary embodiment, the second lens 220, the fourth lens 240, and the fifth lens 250 may be metalenses. The object-side and image-side surfaces of the second lens 220, the fourth lens 240, and the fifth lens 250, which are metalenses, may be substantially planar.

[0107] Each of the meta-lenses 220, 240, and 250 can have a unique form. For example, as... Figures 7 to 9 As shown, each of the meta-lenses 220, 240, and 250 can be formed in a quadrilateral shape (e.g., a rectangular shape) or a circular shape. However, the meta-lenses 220, 240, and 250 are not limited to this. Figures 7 to 9 The form shown.

[0108] Each of the metalenses 220, 240, and 250 can be divided into multiple regions. For example, each of the metalenses 220, 240, and 250 may include a first region 12 corresponding to a blue light wavelength, a second region 14 corresponding to a green light wavelength, a third region 16 corresponding to a red light wavelength, and a fourth region 18 corresponding to a green light wavelength. The first region 12 corresponding to a blue light wavelength, the second region 14 corresponding to a green light wavelength, the third region 16 corresponding to a red light wavelength, and the fourth region 18 corresponding to a green light wavelength can be arranged in a predetermined manner. For example, the first region 12 corresponding to a blue light wavelength, the second region 14 corresponding to a green light wavelength, the third region 16 corresponding to a red light wavelength, and the fourth region 18 corresponding to a green light wavelength can be formed sequentially around the optical axis in a clockwise or counterclockwise direction. In another example, the first region 12 corresponding to a blue light wavelength can be symmetrically arranged with respect to the third region 16 corresponding to a red light wavelength about the optical axis, and the second region 14 corresponding to a green light wavelength can be symmetrically arranged with respect to the fourth region 18 corresponding to a green light wavelength about the optical axis.

[0109] The imaging lens system 200 may include a filter IF and an imaging surface IP. The filter IF may be disposed between the fifth lens 250 and the imaging surface IP. The imaging surface IP may be formed on the image sensor 900.

[0110] The image sensor 900 according to this exemplary embodiment may have features similar to those of the metalenses 220, 240, and 250. For example, as Figure 10As shown, the image sensor 900 can be divided into multiple regions. In a specific example, the image sensor 900 may include a first region 910 corresponding to a blue light wavelength, a second region 920 corresponding to a green light wavelength, a third region 930 corresponding to a red light wavelength, and a fourth region 940 corresponding to a green light wavelength. The first region 910, the second region 920, the third region 930, and the fourth region 940 can be arranged in a predetermined manner. For example, the first region 910, the second region 920, the third region 930, and the fourth region 940 can be sequentially formed around the optical axis in a clockwise or counterclockwise direction. In another example, the first region 910 corresponding to a blue light wavelength can be symmetrically arranged with respect to the third region 930 corresponding to a red light wavelength about the optical axis, and the second region 920 corresponding to a green light wavelength can be symmetrically arranged with respect to the fourth region 940 corresponding to a green light wavelength about the optical axis.

[0111] The first region 910 corresponding to the blue light wavelength, the second region 920 corresponding to the green light wavelength, the third region 930 corresponding to the red light wavelength, and the fourth region 940 corresponding to the green light wavelength of the image sensor 900 can respectively converge the light emitted from the first region 12 to the fourth region 18 of the metalenses 220, 240, and 250. For example, the first region 910 of the image sensor 900 corresponding to the blue light wavelength can image the light refracted by the first region 12 of the metalenses 220, 240, and 250; the second region 920 and the fourth region 940 of the image sensor 900 corresponding to the green light wavelength can image the light refracted by the second region 14 and the fourth region 18 of the metalenses 220, 240, and 250; and the third region 930 of the image sensor 900 corresponding to the red light wavelength can image the light refracted by the third region 16 of the metalenses 220, 240, and 250.

[0112] The imaging lens system 200 configured as described above can achieve clear imaging by focusing light of blue, green, and red wavelengths, respectively, through at least one of the metalenses 220, 240, and 250. Furthermore, the imaging lens system 200 according to this exemplary embodiment includes thin metalenses 220, 240, and 250, thereby significantly reducing the size of the imaging lens system 200.

[0113] Figure 12 , Figure 14 and Figure 16 Aberration characteristics of the imaging lens system 200 according to this exemplary embodiment are shown. Tables 7 to 9 show the lens characteristics of the imaging lens system 200 according to this exemplary embodiment, and Tables 10 to 12 show the phase function values ​​of the imaging lens system 200 according to this exemplary embodiment.

[0114] [Table 7]

[0115] [Table 8]

[0116] [Table 9]

[0117] [Table 10]

[0118] [Table 11]

[0119] [Table 12]

[0120] In the following text, reference will be made to Figures 17 to 22 An imaging lens system according to a third exemplary embodiment is described.

[0121] Imaging lens system 300 may include a lens group. For example, imaging lens system 300 may include a lens group disposed between an object and an imaging plane IP. The lens group may include at least one lens. For example, the lens group of imaging lens system 300 may include a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, and a fifth lens 350.

[0122] Each of the first lens 310 to the fifth lens 350 may have a predetermined refractive power. For example, the first lens 310 may have positive refractive power, the second lens 320 may have negative refractive power, the third lens 330 may have positive refractive power, the fourth lens 340 may have positive refractive power, and the fifth lens 350 may have positive refractive power.

[0123] Each of the second lens 320, the third lens 330, and the fifth lens 350 may have a surface that is either convex or concave. For example, the second lens 320 may have a concave object-side surface and a convex image-side surface, the third lens 330 may have a convex object-side surface and a concave image-side surface, and the fifth lens 350 may have a concave object-side surface and a convex image-side surface.

[0124] The imaging lens system 300 may include at least one metalens. For example, in the imaging lens system 300 according to this exemplary embodiment, the first lens 310 and the fourth lens 340 may be metalenses. The object-side and image-side surfaces of the first lens 310 and the fourth lens 340, which are metalenses, may be substantially planar.

[0125] Each of the meta-lenses 310 and 340 can have a unique form. For example, as Figures 7 to 9 As shown, each of the meta-lenses 310 and 340 can be formed in a quadrilateral shape (e.g., a rectangular shape) or a circular shape. However, the meta-lenses 310 and 340 are not limited to this. Figures 7 to 9 The form shown.

[0126] Each of the metalenses 310 and 340 can be divided into multiple regions. For example, each of the metalenses 310 and 340 may include a first region 12 corresponding to a blue light wavelength, a second region 14 corresponding to a green light wavelength, a third region 16 corresponding to a red light wavelength, and a fourth region 18 corresponding to a green light wavelength. The first region 12 corresponding to a blue light wavelength, the second region 14 corresponding to a green light wavelength, the third region 16 corresponding to a red light wavelength, and the fourth region 18 corresponding to a green light wavelength can be arranged in a predetermined manner. For example, the first region 12 corresponding to a blue light wavelength, the second region 14 corresponding to a green light wavelength, the third region 16 corresponding to a red light wavelength, and the fourth region 18 corresponding to a green light wavelength can be formed sequentially around the optical axis in a clockwise or counterclockwise direction. In another example, the first region 12 corresponding to a blue light wavelength can be symmetrically arranged with respect to the third region 16 corresponding to a red light wavelength about the optical axis, and the second region 14 corresponding to a green light wavelength can be symmetrically arranged with respect to the fourth region 18 corresponding to a green light wavelength about the optical axis.

[0127] The imaging lens system 300 may include a filter IF and an imaging surface IP. The filter IF may be disposed between the fifth lens 350 and the imaging surface IP. The imaging surface IP may be formed on the image sensor 900.

[0128] The image sensor 900 according to this exemplary embodiment may have features similar to those of the metalenses 310 and 340. For example, such as Figure 10As shown, the image sensor 900 can be divided into multiple regions. In a specific example, the image sensor 900 may include a first region 910 corresponding to a blue light wavelength, a second region 920 corresponding to a green light wavelength, a third region 930 corresponding to a red light wavelength, and a fourth region 940 corresponding to a green light wavelength. The first region 910, the second region 920, the third region 930, and the fourth region 940 can be arranged in a predetermined manner. For example, the first region 910, the second region 920, the third region 930, and the fourth region 940 can be formed sequentially around the optical axis in a clockwise or counterclockwise direction. In another example, the first region 910 corresponding to a blue light wavelength can be symmetrically arranged with respect to the third region 930 corresponding to a red light wavelength about the optical axis, and the second region 920 corresponding to a green light wavelength can be symmetrically arranged with respect to the fourth region 940 corresponding to a green light wavelength about the optical axis.

[0129] The first region 910 corresponding to the blue light wavelength, the second region 920 corresponding to the green light wavelength, the third region 930 corresponding to the red light wavelength, and the fourth region 940 corresponding to the green light wavelength of the image sensor 900 can respectively converge the light emitted from the first region 12 to the fourth region 18 of the metalenses 310 and 340. For example, the first region 910 of the image sensor 900 corresponding to the blue light wavelength can image the light refracted by the first region 12 of the metalenses 310 and 340, the second region 920 and the fourth region 940 of the image sensor 900 corresponding to the green light wavelength can image the light refracted by the second region 14 and the fourth region 18 of the metalenses 310 and 340, and the third region 930 of the image sensor 900 corresponding to the red light wavelength can image the light refracted by the third region 16 of the metalenses 310 and 340.

[0130] The imaging lens system 300 configured as described above can achieve clear imaging by converging light of blue, green, and red wavelengths, respectively, through at least one of the metalenses 310 and 340. Furthermore, the imaging lens system 300 according to this exemplary embodiment includes thin metalenses 310 and 340, thereby significantly reducing the size of the imaging lens system 300.

[0131] Figure 18 , Figure 20 and Figure 22 Aberration characteristics of the imaging lens system 300 according to this exemplary embodiment are shown. Tables 13 to 15 show the lens characteristics of the imaging lens system 300 according to this exemplary embodiment, and Tables 16 to 18 show the phase function values ​​of the imaging lens system 300 according to this exemplary embodiment.

[0132] [Table 13]

[0133] [Table 14]

[0134] [Table 15]

[0135] [Table 16]

[0136] [Table 17]

[0137] [Table 18]

[0138] Table 19 shows the feature values ​​of the imaging lens system according to the first exemplary embodiment to the third exemplary embodiment.

[0139] [Table 19]

[0140] Table 20 shows the values ​​of the conditional expressions for the imaging lens systems according to the first exemplary embodiment to the third exemplary embodiment.

[0141] [Table 20]

[0142] As described above, this disclosure can provide an imaging lens system that enables miniaturization and thinning of the camera module.

[0143] Furthermore, this disclosure provides an imaging lens system capable of correcting aberrations in a camera module.

[0144] While specific examples have been shown and described above, it will be apparent upon understanding this disclosure that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be understood in a descriptive sense only and not for limiting purposes. The description of features or aspects in each example should be considered applicable to similar features or aspects in other examples. Suitable results may still be achieved if the described techniques are performed in a different order, and / or if components in the described system, architecture, device, or circuit are combined in different ways and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of this disclosure is not limited by the specific embodiments but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in this disclosure.

Claims

1. An imaging lens system, comprising: The first lens, second lens, third lens, fourth lens, and fifth lens are arranged sequentially from the object side. At least one of the first to fifth lenses is a meta-lens.

2. The imaging lens system according to claim 1, wherein, The meta-lens has positive refractive power.

3. The imaging lens system according to claim 1, wherein, The first lens or the second lens is the meta-lens.

4. The imaging lens system according to claim 1, wherein, The fourth lens is the meta-lens.

5. The imaging lens system according to claim 1, wherein, At least one of the first to the fifth lenses has negative refractive power.

6. The imaging lens system according to claim 1, wherein, Each of the first to the fifth lenses is a pair of adjacent lenses with positive refractive power.

7. The imaging lens system according to claim 1, wherein, One of the second to the fourth lenses has negative refractive power.

8. The imaging lens system according to claim 1, wherein, The meta-lens includes a first region corresponding to the blue light wavelength, a second region corresponding to the green light wavelength, a third region corresponding to the red light wavelength, and a fourth region corresponding to the green light wavelength.

9. The imaging lens system according to claim 8, wherein, The first region and the second region are symmetrical about the optical axis with respect to the third region and the fourth region, respectively.

10. An imaging lens system, comprising: The lens group is positioned between the object and the image plane. The lens group includes at least one metalens.

11. The imaging lens system according to claim 10, wherein, The meta-lens has positive refractive power.

12. The imaging lens system according to claim 10, wherein, The lens group includes lenses with negative refractive power.

13. The imaging lens system according to claim 10, wherein, The meta-lens includes a first region corresponding to the blue light wavelength, a second region corresponding to the green light wavelength, a third region corresponding to the red light wavelength, and a fourth region corresponding to the green light wavelength.

14. The imaging lens system according to claim 10, wherein, The following conditional expression is satisfied: 0.60 < TTL / 2Y < 0.80 Wherein, TTL is the distance from the object side of the foremost lens in the lens group to the imaging surface, and 2Y is the diagonal length of the imaging surface.

15. The imaging lens system according to claim 10, wherein, The following conditional expression is satisfied: 0.2 < BFL / f < 0.8, Wherein, BFL is the distance from the image side of the last lens in the lens group to the imaging plane, and f is the focal length of the imaging lens system.

Images