Imagning lens

Abstract

The present embodiment relates to an imaging lens comprising a first lens having a positive (+) refractive power; a second lens having a negative (-) refractive power; a third lens having a positive (+) refractive power; a fourth lens having a positive (+) refractive power; and a fifth lens having a negative (-) refractive power, wherein the first to fifth lenses are arranged sequentially from the object side to the upper side, and the first lens includes an object side surface and an upper side surface symmetrical with respect to a first axis and a second axis perpendicular to the first axis.

Description

Technology Field

[0001] This embodiment relates to an imaging lens. Background Technology

[0002] Recently, regarding image pick-up systems, camera modules for communication terminals, digital still cameras (DSCs), camcorders, and PC cameras (imaging devices attached to personal computers) are being researched. One of the most important components for a camera module related to such an image pick-up system to obtain an image is the imaging lens that forms the image.

[0003] Portable terminals, such as mobile phones or automotive cameras, are increasingly becoming smaller and / or lighter. In line with this trend, imaging lenses are also becoming smaller. In addition, along with making imaging lenses smaller, there is a demand for high-performance imaging lenses to keep up with the increased performance of light-receiving elements.

[0004] Conventional imaging lenses perform auto-focusing (AF) and optical image stabilization (OIS) functions through a voice coil motor-type lens drive device. Therefore, there is a problem in that it is difficult to reduce the size of the entire camera module. The problem to be solved

[0005] The present embodiment aims to provide an imaging lens having a low F-number.

[0006] In addition, we aim to provide an imaging lens with an increased aperture area by increasing the diameter in the X direction and decreasing the diameter in the Y direction.

[0007] In addition, we intend to provide an imaging lens including a non-rotationally symmetric lens surface. means of solving the problem

[0008] The imaging lens according to the present embodiment includes a first lens having a positive (+) refractive power; a second lens having a negative (-) refractive power; a third lens having a positive (+) refractive power; a fourth lens having a positive (+) refractive power; and a fifth lens having a negative (-) refractive power, wherein the first to fifth lenses are arranged sequentially from the object side to the upper side, and the first lens may include an object side surface and an upper side surface that are symmetric with respect to a first axis and a second axis perpendicular to the first axis.

[0009] In addition, the second lens may include an object side and an upper side and an object side that are symmetrical with respect to the first axis and the second axis.

[0010] In addition, the third to fifth lenses may be circularly symmetrical.

[0011] In addition, the diameter in the first axis direction of the first lens may be larger than the diameter in the second axis direction of the first lens.

[0012] In addition, the diameter of the first lens in the direction of the first axis may be larger than the diameter in the corresponding direction of the third to fifth lenses.

[0013] In addition, it may include a prism positioned in front of the first lens.

[0014] In addition, the diameter of the first lens in the direction of the second axis may be the same as the length in the corresponding direction of the prism.

[0015] In addition, the object side surface of the first lens may be convex, and the upper side surface of the first lens may be convex.

[0016] In addition, the object side of the second lens may be concave, and the upper side of the second lens may be concave.

[0017] In addition, the object side of the third lens may be convex and the upper side of the third lens may be concave.

[0018] In addition, the object side of the fourth lens may be concave and the upper side of the fourth lens may be convex.

[0019] In addition, the object side of the fifth lens may be convex and the upper side of the fifth lens may be concave.

[0020] A camera module according to the present embodiment may include an image sensor; the imaging lens; and a filter disposed between the image sensor and the imaging lens.

[0021] The smartphone according to the present embodiment may include the camera module. Effects of the invention

[0022] Through this embodiment, an imaging lens having a low F-number can be provided.

[0023] In addition, it is possible to provide an imaging lens with an increased aperture area by increasing the diameter in the X direction and decreasing the diameter in the Y direction.

[0024] In addition, an imaging lens including a non-rotationally symmetric lens surface can be provided.

[0025] In addition, a miniaturized camera module can be provided.

[0026] In addition, it is possible to provide an imaging lens with excellent aberration characteristics and good aberration correction ability.

[0027] In addition, a high Modulation Transfer Function (MTF) can be secured by independently correcting aberrations in the X-axis and Y-axis directions. Brief explanation of the drawing

[0028] FIG. 1 is a conceptual diagram of an imaging lens according to a first embodiment of the present invention. FIG. 2 is a drawing showing the YZ plane of an imaging lens according to the first embodiment of the present invention. FIG. 3 is a drawing showing the XZ plane of an imaging lens according to the first embodiment of the present invention. FIG. 4 is a drawing showing the YZ plane of an imaging lens according to a second embodiment of the present invention. FIG. 5 is a drawing showing the XZ plane of an imaging lens according to a second embodiment of the present invention. FIG. 6 is a drawing illustrating the degree of distortion according to the image height of an imaging lens according to a second embodiment of the present invention. FIG. 7 is a drawing showing the YZ plane of an imaging lens according to a third embodiment of the present invention. FIG. 8 is a drawing showing the XZ plane of an imaging lens according to the third embodiment of the present invention. FIG. 9 is a drawing illustrating the degree of distortion according to the image height of an imaging lens according to the third embodiment of the present invention. Specific details for implementing the invention

[0029] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0030] However, the technical concept of the present invention is not limited to some of the described embodiments but can be implemented in various different forms, and within the scope of the technical concept of the present invention, one or more of the components among the embodiments may be selectively combined or substituted.

[0031] In addition, terms used in the embodiments of the present invention (including technical and scientific terms) may be interpreted in a sense that is generally understood by those skilled in the art to which the present invention belongs, unless explicitly and specifically defined otherwise. Terms that are commonly used, such as terms defined in advance, may be interpreted in consideration of their meaning in the context of the relevant technology.

[0032] Furthermore, the terms used in the embodiments of the present invention are for the purpose of describing the embodiments and are not intended to limit the present invention.

[0033] In this specification, the singular form may include the plural form unless specifically stated otherwise in the text, and when described as "at least one of A and B and C (or more than one)," it may include one or more of all combinations that can be formed from A, B, and C.

[0034] In addition, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the embodiments of the present invention. These terms are used merely to distinguish the components from other components and are not intended to limit the essence, order, or sequence of the components.

[0035] And, where it is stated that a component is 'connected', 'combined', or 'connected' to another component, this may include not only cases where the component is directly 'connected', 'combined', or 'connected' to the other component, but also cases where it is 'connected', 'combined', or 'connected' due to another component located between the component and the other component.

[0036] Furthermore, when described as being formed or placed "above" or "below" each component, "above" or "below" includes not only cases where two components are in direct contact with each other, but also cases where one or more other components are formed or placed between the two components. Additionally, when expressed as "above" or "below," it may include the meaning of a downward direction as well as an upward direction relative to a single component.

[0037] In describing the configuration of each lens below, the term 'object side' refers to the surface of the lens facing the object, and the term 'image side' refers to the surface of the lens facing the image plane.

[0038] The units of length, distance, radius of curvature, thickness, etc. used below may be in mm.

[0039] x, y, and z used below represent the directions of a 3rd-order basic coordinate system with the optical axis direction as the z-axis. The x-axis may represent the first axis, and the y-axis may represent the second axis. The z-axis may represent the optical axis.

[0041] Hereinafter, the configuration of an imaging lens according to the first embodiment of the present invention will be described with reference to the drawings.

[0042] FIG. 1 is a conceptual diagram of an imaging lens according to a first embodiment of the present invention. FIG. 2 is a diagram showing the YZ plane of an imaging lens according to a first embodiment of the present invention. FIG. 3 is a diagram showing the XZ plane of an imaging lens according to a first embodiment of the present invention.

[0043] An imaging lens according to the first embodiment of the present invention may include a plurality of lenses. The imaging lens may include five lenses. The imaging lens may include a first lens (100), a second lens (200), a third lens (300), a fourth lens (400), a fifth lens (500), a prism (800), and an aperture (STOP). However, in the imaging lens according to the first embodiment, one or more of the first lens (100), the second lens (200), the third lens (300), the fourth lens (400), the fifth lens (500), the prism (800), and the aperture (STOP) may be omitted. The imaging lens may be configured such that a prism (800), an aperture (STOP), a first lens (100), a second lens (200), a third lens (300), a fourth lens (400), and a fifth lens (500) are arranged in order from the object side to the image side. In another embodiment, the imaging lens may be configured such that a prism (800), a first lens (100), a second lens (200), a third lens (300), a fourth lens (400), and a fifth lens (500) are arranged in order from the object side to the image side. The imaging lens according to the first embodiment may be composed of four or fewer lenses. Alternatively, the imaging lens according to the first embodiment may be composed of six or more lenses.

[0044] In another embodiment, one or more of other lenses, flat plates, and optical members may be added between the first lens (100) to the fifth lens (500). Additionally, one or more of other lenses, flat plates, and optical members may be added in front of the first lens (100) or behind the fifth lens (500). Additionally, one or more of other lenses, flat plates, and optical members may be added between the aperture (STOP) and the lens, between the lens and the filter (600), and between the filter (600) and the image sensor (700). In this case, the filter (600) may be a flat lens. The refractive power of the flat lens may be '0'. The refractive power of the flat lens may be zero. Additionally, a filter layer may be placed between the aperture (STOP) and the lens, between the lens and the filter (600), and between the filter (600) and the image sensor (700). In this case, the filter layer may be coated to become a filter.

[0045] The imaging lens may include a first lens (100). The first lens (100) may be closest to the object side. The first lens (100) may be the first lens positioned on the object side. The first lens (100) may be the first lens adjacent to the object side. An additional lens may be positioned between the first lens (100) and the second lens (200). A second to fourth lens (200, 300, 400) may be positioned between the first lens (100) and the fifth lens (500). Other lenses other than the second to fourth lenses (200, 300, 400) may be additionally positioned between the first lens (100) and the fifth lens (500). A lens may be additionally disposed between at least two of the first to fifth lenses (100, 200, 300, 400, 500).

[0046] The first lens (100) may have a positive (+) refractive power. The first lens (100) may be a non-rotationally symmetric lens. The first lens (100) may be a non-circularly symmetric lens. The first lens (100) may be an anamorphic lens. The first lens (100) may include a non-rotationally symmetric plane. The first lens (100) may include an anamorphic lens plane. The first lens (100) may include an object side surface that is non-rotationally symmetric. The first lens (100) may include an upper side surface that is non-rotationally symmetric.

[0047] The first lens (100) may include an object side that is symmetric with respect to the first axis. The first lens (100) may include an object side that is symmetric with respect to the second axis. The first lens (100) may include an object side that is symmetric with respect to the first axis and the second axis. The first lens (100) may include an upper side that is symmetric with respect to the first axis. The first lens (100) may include an upper side that is symmetric with respect to the second axis. The first lens (100) may include an upper side that is symmetric with respect to the first axis and the second axis. In this case, the optical axis may mean the z-axis of a third-order orthogonal coordinate system, the first axis may mean the x-axis of a third-order orthogonal coordinate system, and the second axis may mean the y-axis of a third-order orthogonal coordinate system.

[0048] The diameter in the first axis direction of the first lens (100) may be larger than the diameter in the second axis direction of the first lens (100). The diameter in the first axis direction of the first lens (100) may be at least 1.3 times larger than the diameter in the second axis direction of the first lens (100). Through this, an imaging lens that is equal to or larger than the aperture area of ​​a conventional circular symmetric lens can be realized. The diameter in the first axis direction of the first lens (100) may be larger than the diameter in the corresponding direction of the third to fifth lenses (300, 400, 500). The diameter in the first axis direction of the first lens (100) may be larger than the diameter in the corresponding direction of the circular symmetric lens. The diameter in the second axis direction of the first lens (100) may be equal to the length in the corresponding direction of the prism (800). The diameter in the second axis direction of the first lens (100) may be smaller than the length in the corresponding direction of the prism (800).

[0049] The first lens (100) may have both sides formed convexly. The first lens (100) may have an object side formed convexly. The first lens (100) may have an object side formed convexly at the optical axis. The first lens (100) may include an object side having a convex shape. The first lens (100) may include an object side having a convex shape at the optical axis. The first lens (100) may have an upper side formed convexly. The first lens (100) may have an upper side formed convexly at the optical axis. The first lens (100) may include an upper side having a convex shape. The first lens (100) may include an upper side having a convex shape at the optical axis. The object side or upper side of the first lens (100) may include at least one inflection point.

[0050] The radius of curvature of the object side of the first lens (100) may be positive. The radius of curvature of the object side of the first lens (100) at the optical axis may be positive. The radius of curvature of the object side of the first lens (100) in the direction of the first axis may be positive. The radius of curvature of the object side of the first lens (100) in the direction of the first axis at the optical axis may be positive. The radius of curvature of the object side of the first lens (100) in the direction of the second axis may be positive. The radius of curvature of the object side of the first lens (100) in the direction of the second axis at the optical axis may be positive.

[0051] The radius of curvature of the upper surface of the first lens (100) may be negative. The radius of curvature of the upper surface of the first lens (100) at the optical axis may be negative. The radius of curvature of the upper surface of the first lens (100) in the direction of the first axis may be negative. The radius of curvature of the upper surface of the first lens (100) in the direction of the second axis may be negative. The radius of curvature of the upper surface of the first lens (100) in the direction of the first axis at the optical axis may be negative. The radius of curvature of the upper surface of the first lens (100) in the direction of the second axis at the optical axis may be negative.

[0052] The absolute value of the radius of curvature of the object side of the first lens (100) may be smaller than the absolute value of the radius of curvature of the upper side of the first lens (100). The absolute value of the radius of curvature in the first axis direction of the object side of the first lens (100) may be smaller than the absolute value of the radius of curvature in the first axis direction of the upper side of the first lens (100). The absolute value of the radius of curvature in the second axis direction of the object side of the first lens (100) may be smaller than the absolute value of the radius of curvature in the second axis direction of the upper side of the first lens (100). The absolute value of the radius of curvature in the first axis direction of the object side of the first lens (100) may be larger than the absolute value of the radius of curvature in the second axis direction of the object side of the first lens (100).

[0053] The imaging lens may include a second lens (200). The second lens (200) may be a second lens positioned on the object side. The second lens (200) may be a second adjacent lens on the object side. The second lens (200) may be positioned between the first lens (100) and the upper side. The second lens (200) may be positioned between the first lens (100) and the third lens (300). An additional lens may be positioned between the second lens (200) and the first lens (100) or between the second lens (200) and the third lens (300).

[0054] The second lens (200) may have negative (-) refractive power. The second lens (200) may be a non-rotationally symmetric lens. The second lens (200) may be a non-circularly symmetric lens. The second lens (200) may be an anamorphic lens. The second lens (200) may include a non-rotationally symmetric plane. The second lens (200) may include an anamorphic lens plane. The second lens (200) may include an object side surface that is non-rotationally symmetric. The second lens (200) may include an upper side surface that is non-rotationally symmetric.

[0055] The second lens (200) may include an object side that is symmetric with respect to the first axis. The second lens (200) may include an object side that is symmetric with respect to the second axis. The second lens (200) may include an object side that is symmetric with respect to the first axis and the second axis. The second lens (200) may include an upper side that is symmetric with respect to the first axis. The second lens (200) may include an upper side that is symmetric with respect to the second axis. The second lens (200) may include an upper side that is symmetric with respect to the first axis and the second axis. In this case, the optical axis may mean the z-axis of a third-order orthogonal coordinate system, the first axis may mean the x-axis of a third-order orthogonal coordinate system, and the second axis may mean the y-axis of a third-order orthogonal coordinate system.

[0056] The second lens (200) may have both sides formed concave. The second lens (200) may have an object side formed concave. The second lens (200) may have an object side formed concave at the optical axis. The second lens (200) may include an object side having a concave shape. The second lens (200) may include an object side having a concave shape at the optical axis. The second lens (200) may have an upper side formed concave. The second lens (200) may have an upper side formed concave at the optical axis. The second lens (200) may include an upper side having a concave shape. The second lens (200) may include an upper side having a concave shape at the optical axis. The object side or upper side of the second lens (200) may include at least one inflection point.

[0057] The radius of curvature of the object side of the second lens (200) may be negative. The radius of curvature of the object side of the second lens (200) at the optical axis may be negative. The radius of curvature of the object side of the second lens (200) in the direction of the first axis may be negative. The radius of curvature of the object side of the second lens (200) in the direction of the first axis at the optical axis may be negative. The radius of curvature of the object side of the second lens (200) in the direction of the second axis may be negative. The radius of curvature of the object side of the second lens (200) in the direction of the second axis at the optical axis may be negative.

[0058] The radius of curvature of the upper surface of the second lens (200) may be positive. The radius of curvature of the upper surface of the second lens (200) at the optical axis may be positive. The radius of curvature of the upper surface of the second lens (200) in the direction of the first axis may be positive. The radius of curvature of the upper surface of the second lens (200) in the direction of the second axis may be positive. The radius of curvature of the upper surface of the second lens (200) in the direction of the first axis at the optical axis may be positive. The radius of curvature of the upper surface of the second lens (200) in the direction of the second axis at the optical axis may be positive.

[0059] The absolute value of the radius of curvature of the object side of the second lens (200) may be greater than the absolute value of the radius of curvature of the upper side of the second lens (200). The absolute value of the radius of curvature in the first axis direction of the object side of the second lens (200) may be greater than the absolute value of the radius of curvature in the first axis direction of the upper side of the second lens (200). The absolute value of the radius of curvature in the second axis direction of the object side of the second lens (200) may be greater than the absolute value of the radius of curvature in the second axis direction of the upper side of the second lens (200). The absolute value of the radius of curvature in the first axis direction of the object side of the second lens (200) may be greater than the absolute value of the radius of curvature in the second axis direction of the object side of the second lens (200).

[0060] The imaging lens may include a third lens (300). The third lens (300) may be the third lens positioned from the object side. The third lens (300) may be the third adjacent lens from the object side. The third lens (300) may be positioned between the second lens (200) and the upper side. The third lens (300) may be positioned between the second lens (200) and the fourth lens (400). An additional lens may be positioned between the third lens (300) and the second lens (200) or between the third lens (300) and the fourth lens (400).

[0061] The third lens (300) may have a positive (+) refractive power. The third lens (300) may be a circularly symmetric lens. The third lens (300) may have an object side surface formed convexly. The third lens (300) may have an object side surface formed convexly at the optical axis. The third lens (300) may include an object side surface having a convex shape. The third lens (300) may include an object side surface having a convex shape at the optical axis. The third lens (300) may have an upper side surface formed concavely. The third lens (300) may have an upper side surface formed concavely at the optical axis. The third lens (300) may include an upper side surface having a concave shape. The third lens (300) may include an upper side surface having a concave shape at the optical axis. The third lens (300) may be formed in a convex meniscus shape on the side of the object. The third lens (300) may be formed in a convex meniscus shape on the side of the object along the optical axis. The side of the object or the upper side of the third lens (300) may include at least one inflection point.

[0062] The radius of curvature of the object side of the third lens (300) may be positive. The radius of curvature at the optical axis of the object side of the third lens (300) may be positive. The radius of curvature of the upper side of the third lens (300) may be positive. The radius of curvature at the optical axis of the upper side of the third lens (300) may be positive. The radius of curvature of the object side of the third lens (300) may be larger than the radius of curvature of the upper side of the third lens (300). The radius of curvature in the first axis direction and the radius of curvature in the second axis direction of the object side of the third lens (300) may be equal. The radius of curvature in the first axis direction and the radius of curvature in the second axis direction of the upper side of the third lens (300) may be equal.

[0063] The imaging lens may include a fourth lens (400). The fourth lens (400) may be the fourth lens positioned from the object side. The fourth lens (400) may be the fourth adjacent lens from the object side. The fourth lens (400) may be the second lens positioned from the upper side. The fourth lens (400) may be the second adjacent lens from the upper side. The fourth lens (400) may be positioned between the third lens (300) and the upper side. The fourth lens (400) may be positioned between the third lens (300) and the fifth lens (500). An additional lens may be positioned between the fourth lens (400) and the third lens (300) or between the fourth lens (400) and the fifth lens (500).

[0064] The fourth lens (400) may have a positive (+) refractive power. The fourth lens (400) may be a circularly symmetric lens. The fourth lens (400) may have an object side surface formed concavely. The fourth lens (400) may have an object side surface formed concavely along the optical axis. The fourth lens (400) may include an object side surface having a concave shape. The fourth lens (400) may include an object side surface having a concave shape along the optical axis. The fourth lens (400) may have an upper side surface formed convexly. The fourth lens (400) may have an upper side surface formed convexly along the optical axis. The fourth lens (400) may include an upper side surface having a convex shape. The fourth lens (400) may have an object side surface formed in a concave meniscus shape. The fourth lens (400) may be formed with a meniscus shape in which the object side is concave at the optical axis. The fourth lens (400) may include an upper side having a convex shape at the optical axis. The object side or upper side of the fourth lens (400) may include at least one inflection point.

[0065] The radius of curvature of the object side of the fourth lens (400) may be negative. The radius of curvature at the optical axis of the object side of the fourth lens (400) may be negative. The radius of curvature of the upper side of the fourth lens (400) may be negative. The radius of curvature at the optical axis of the upper side of the fourth lens (400) may be negative. The absolute value of the radius of curvature of the object side of the fourth lens (400) may be greater than the absolute value of the radius of curvature of the upper side of the fourth lens (400). The radius of curvature in the first axis direction and the radius of curvature in the second axis direction of the object side of the fourth lens (400) may be the same. The radius of curvature in the first axis direction and the radius of curvature in the second axis direction of the upper side of the fourth lens (400) may be the same.

[0066] The imaging lens may include a fifth lens (500). The fifth lens (500) may be the lens closest to the upper side. The fifth lens (500) may be positioned between the fourth lens (400) and the upper side. The fifth lens (500) may be positioned between the fourth lens (400) and the filter (600). An additional lens may be positioned between the fifth lens (500) and the fourth lens (400) or between the fifth lens (500) and the filter (600).

[0067] The fifth lens (500) may have negative (-) refractive power. The fifth lens (500) may be a circularly symmetric lens. The fifth lens (500) may have an object side surface formed convexly. The fifth lens (500) may have an object side surface formed convexly at the optical axis. The fifth lens (500) may include an object side surface having a convex shape. The fifth lens (500) may include an object side surface having a convex shape at the optical axis. The fifth lens (500) may have an upper side surface formed concavely. The fifth lens (500) may have an upper side surface formed concavely at the optical axis. The fifth lens (500) may include an upper side surface formed concavely. The fifth lens (500) may include an upper side surface formed concavely at the optical axis. The fifth lens (500) may be formed in a convex meniscus shape on the side of the object. The fifth lens (500) may be formed in a convex meniscus shape on the side of the object along the optical axis. The side of the object or the upper side of the fifth lens (500) may include at least one inflection point.

[0068] The radius of curvature of the object side of the fifth lens (500) may be positive. The radius of curvature at the optical axis of the object side of the fifth lens (500) may be positive. The radius of curvature of the upper side of the fifth lens (500) may be positive. The radius of curvature at the optical axis of the upper side of the fifth lens (500) may be positive. The radius of curvature of the object side of the fifth lens (500) may have the same radius of curvature in the first axis direction and the same radius of curvature in the second axis direction. The radius of curvature of the upper side of the fifth lens (500) may have the same radius of curvature in the first axis direction and the same radius of curvature in the second axis direction.

[0069] All lens surfaces of the third lens (300), the fourth lens (400), and the fifth lens (500) may be formed as spherical or aspherical. Each of the third lens (300), the fourth lens (400), and the fifth lens (500) may have both sides formed as spherical. Each of the third lens (300), the fourth lens (400), and the fifth lens (500) may have both sides formed as aspherical. Each of the third lens (300), the fourth lens (400), and the fifth lens (500) may have one side formed as spherical and the other side formed as aspherical.

[0070] The imaging lens may include a prism (800). The prism (800) may be placed in front of the first lens (100). The prism (800) may be placed on the object side of the first lens (100). The prism (800) may be placed in front of the aperture (STOP). The prism (800) may change the path of light incident from the object. The prism (800) may include a reflective surface that reflects light incident from the object. The prism (800) may cause total internal reflection of light incident from the object. The prism (800) may include a perceptual prism.

[0071] The imaging lens may include an aperture (STOP). The aperture (STOP) may be positioned in front of the first lens (100). The aperture (STOP) may be positioned between the first lens (100) and the prism (800). The aperture (STOP) can control the amount of light incident from the subject. The aperture (STOP) can control the amount of light passing through the prism (800). The aperture (STOP) can control the amount of light incident on the first lens (100). The aperture (STOP) may include an aperture diameter.

[0072] The aspherical surface mentioned below can be obtained from Equation 1. E and the numbers following it, used for the conic constant k and the aspherical coefficients A, B, C, D, E, F, G, H, and J, represent powers of 10. For example, E+01 is 10 1 It represents, and E-02 is 10 -2 It represents.

[0073]

[0074] Here, z represents the distance from the vertex of the lens in the direction of the optical axis. c represents the fundamental curvature of the lens. R represents the distance in the direction perpendicular to the optical axis. K represents the conic constant. A, B, C, D, E, F, G, H, and J represent the aspheric coefficients.

[0075] The conic constant (K) may be a constant representing the conic coefficient. The conic constant (K) may be a constant determining the overall shape of the lens surface. For example, if the value of the conic constant (K) is 0, the shape of the lens surface may be spherical. The aspheric coefficient may represent the degree of deviation from the conic surface determined by the value of the conic constant (K). The aspheric coefficient may be determined by an equation of even order. A, B, C, D, E, F, G, H, and J may represent values ​​obtained from equations of the 4th, 6th, 8th, 10th, 12th, 14th, 16th, 18th, and 20th orders, respectively. If the aspheric coefficient is 0 (A, B, C, D, E, F, G, H, J = 0), the shape of the lens surface may be formed as a completely conical shape.

[0076] surface No. lens No. Y Radius(mm) X Radius(mm) Thickness (mm) material Y semi-aperture(mm) X semi-aperture(mm) 1 prism Infinity Infinity 6.0000 plastic or glass 4.8000 8.0000 2 Infinity Infinity 0.5000 4.8000 8.0000 STOP 4.4000 4.8000 8.0000 3 First lens 4.9303 4.9411 0.1198 plastic 4.8000 8.0000 4 -15.8333 -19.8031 0.8525 4.8000 8.0000 5 Second lens -16.2209 -20.9880 0.3481 plastic 4.8000 8.0000 6 12.8140 12.3558 0.1235 5.6304 5.6304 7 third lens 6.8282 6.8282 2.5892 plastic or glass 5.4156 5.4156 8 4.5842 4.5842 1.8702 4.9742 4.9742 9 Fourth lens -3.1768 -3.1768 0.8275 plastic or glass 5.0652 5.0652 10 -2.8098 -2.8098 0.4952 4.9324 4.9324 11 Fifth lens 4.9937 4.9937 1.4749 plastic or glass 5.8366 5.8366 12 4.8248 4.8248 0.7000 5.8550 5.8550 13 filter Infinity Infinity 0.2100 plastic 5.8034 5.8034 14 Infinity Infinity 0.3520 5.7864 5.7864 Image Infinity Infinity 0.0002 3.4500 4.6000

[0077] Table 1 shows the surface number, lens number, radius of curvature in the Y-axis direction (Y Radius), radius of curvature in the X-axis direction (X Radius), thickness of the center of each lens or distance between lens surfaces (Thickness), material, effective aperture axis (X semi-aperture), and effective aperture axis (Y semi-aperture) of the imaging lens according to the first embodiment of the present invention.

[0079] Hereinafter, the configuration of an imaging lens according to the second embodiment of the present invention will be described with reference to the drawings.

[0080] FIG. 4 is a drawing illustrating the YZ plane of an imaging lens according to a second embodiment of the present invention. FIG. 5 is a drawing illustrating the XZ plane of an imaging lens according to a second embodiment of the present invention. FIG. 6 is a drawing illustrating the distortion of an imaging lens according to a second embodiment of the present invention.

[0081] An imaging lens according to the second embodiment of the present invention may include a plurality of lenses. The imaging lens may include five lenses. The imaging lens may include a first lens (100), a second lens (200), a third lens (300), a fourth lens (400), a fifth lens (500), a prism (800), and an aperture (STOP). However, in the imaging lens according to the second embodiment, one or more of the first lens (100), the second lens (200), the third lens (300), the fourth lens (400), the fifth lens (500), the prism (800), and the aperture (STOP) may be omitted. The imaging lens may be configured such that a prism (800), an aperture (STOP), a first lens (100), a second lens (200), a third lens (300), a fourth lens (400), and a fifth lens (500) are arranged in order from the object side to the image side. In another embodiment, the imaging lens may be configured such that a prism (800), a first lens (100), a second lens (200), a third lens (300), a fourth lens (400), and a fifth lens (500) are arranged in order from the object side to the image side. The imaging lens according to the second embodiment may be composed of four or fewer lenses. Alternatively, the imaging lens according to the second embodiment may be composed of six or more lenses.

[0082] In another embodiment, one or more of other lenses, flat plates, and optical members may be added between the first lens (100) to the fifth lens (500). Additionally, one or more of other lenses, flat plates, and optical members may be added in front of the first lens (100) or behind the fifth lens (500). Additionally, one or more of other lenses, flat plates, and optical members may be added between the aperture (STOP) and the lens, between the lens and the filter (600), and between the filter (600) and the image sensor (700). In this case, the filter (600) may be a flat lens. The refractive power of the flat lens may be '0'. The refractive power of the flat lens may be zero. Additionally, a filter layer may be placed between the aperture (STOP) and the lens, between the lens and the filter (600), and between the filter (600) and the image sensor (700). In this case, the filter layer may be coated to become a filter.

[0083] For the imaging lens according to the second embodiment, the same reference numerals are used for parts identical to those of the imaging lens according to the first embodiment, and the description is omitted. For parts omitted in the description of the imaging lens according to the second embodiment, the description of the imaging lens according to the first embodiment may be applied by analogy.

[0084] The diameter in the first axis direction of the first lens (100) may be larger than the diameter in the second axis direction of the first lens (100). The diameter in the first axis direction of the first lens (100) may be at least 1.3 times larger than the diameter in the second axis direction of the first lens (100). Through this, an imaging lens with an aperture area equal to or larger than that of a conventional circular symmetric lens can be realized. The diameter in the first axis direction of the first lens (100) may be larger than the diameter in the corresponding direction of the third to fifth lenses (300, 400, 500). The diameter in the first axis direction of the first lens (100) may be larger than the diameter in the corresponding direction of the circular symmetric lens. The diameter in the first axis direction of the first lens (100) may be larger than the diameter in the corresponding direction of the second lens (200). The diameter in the second axis direction of the first lens (100) may be equal to the length in the corresponding direction of the prism (800). The diameter of the first lens (100) in the direction of the second axis may be smaller than the length in the corresponding direction of the prism (800).

[0085] surface No. lens No. Y Radius(mm) X Radius(mm) Thickness (mm) material Index Abbe # 1 First lens 5.4 5.4 3.4790 plastic 1.5465 56.09 2 -15.4 -15.59 0.1000 3 Second lens 13.6200 13.4700 2.6170 plastic 1.679 19.24 4 3.4400 3.4400 0.9320 5 third lens 2.7700 - 0.5990 plastic 1.5465 56.09 6 2.6900 - 1.2650 7 Fourth lens 8.5600 - 1.0280 plastic 1.679 19.24 8 41.4300 - 0.9030 9 Fifth lens -10.8400 - 1.1370 plastic 1.679 19.24 10 27.1000 - 0.4020 11 filter Infinity Infinity 0.2100 glass 12 Infinity Infinity Image 0.3260

[0086] Table 2 shows the optical characteristics of the lenses included in the imaging lens according to the second embodiment of the present invention. More specifically, Table 2 shows the surface number, lens number, radius of curvature in the Y-axis direction (Y Radius), radius of curvature in the X-axis direction (X Radius), thickness of the center of each lens or distance between lens surfaces (Thickness), material, refractive index (Index), and Abbe number (Abbe#) of the imaging lens according to the second embodiment of the present invention.

[0087] surface No. lens No. Y aperture (mm) X aperture (mm) Y focal length(mm) X focal length(mm) Shape Refractivepower 1 First lens 7.78 7.80 5.6 8 Convex Positive (+) 2 Convex 3 Second lens -7.56 -7.59 5.6 7 Convex hmm(-) 4 Gomoku 5 third lens 106.00 - - 4.95 Convex Positive (+) 6 Gomoku 7 Fourth lens 15.68 - - 4.56 Convex Positive (+) 8 Gomoku 9 Fifth lens -11.26 - - 4.93 Gomoku hmm(-) 10 Gomoku 11 filter 12 Image

[0088] Table 3 shows the optical characteristics of the lens included in the imaging lens according to the second embodiment of the present invention. More specifically, Table 3 shows the surface number, lens number, effective aperture axis (X semi-aperture), effective aperture axis (Y semi-aperture), Y focal length in the Y-axis direction, X focal length in the X-axis direction, the shape of each lens surface, and the refractive power of each lens of the imaging lens according to the second embodiment of the present invention.

[0089]

[0090] Table 4 shows the values ​​of the imaging lens conic constant (K) and the aspherical coefficients (A, B, C, D, E, F, G, H, J) of each lens surface according to the second embodiment of the present invention. 1-Y represents the ZY plane of the object side of the first lens (100), and 1-X may represent the XY plane of the object side of the first lens (100). 2-Y represents the ZY plane of the upper side of the first lens (100), and 2-X may represent the XY plane of the upper side of the first lens (100). 3-Y represents the ZY plane of the object side of the second lens (200), and 3-X may represent the XY plane of the object side of the second lens (200). 4-Y may mean the ZY plane of the upper side of the second lens (200), and 4-X may mean the XY plane of the upper side of the second lens (200).

[0091] Referring to Table 4, the third to fifth lenses (300, 400, 500), which are rotationally symmetric lenses, may have a specific aspherical coefficient for every even order. The first lens (100), which is not rotationally symmetric, may have an aspherical coefficient for each x-axis and y-axis. The object side of the first lens (100) may have an aspherical coefficient for each x-axis and y-axis. The upper side of the first lens (100) may have an aspherical coefficient for each x-axis and y-axis. The second lens (200), which is not rotationally symmetric, may have an aspherical coefficient for each x-axis and y-axis. The object side of the second lens (200) may have an aspherical coefficient for each x-axis and y-axis. The upper side of the second lens (200) may have an aspherical coefficient for each x-axis and y-axis.

[0093] Hereinafter, the configuration of an imaging lens according to the third embodiment of the present invention will be described with reference to the drawings.

[0094] FIG. 7 is a drawing illustrating the YZ plane of an imaging lens according to a third embodiment of the present invention. FIG. 8 is a drawing illustrating the XZ plane of an imaging lens according to a third embodiment of the present invention. FIG. 9 is a drawing illustrating the distortion of an imaging lens according to a third embodiment of the present invention.

[0095] An imaging lens according to the third embodiment of the present invention may include a plurality of lenses. The imaging lens may include five lenses. The imaging lens may include a first lens (100), a second lens (200), a third lens (300), a fourth lens (400), a fifth lens (500), a prism (800), and an aperture (STOP). However, in the imaging lens according to the third embodiment, one or more of the first lens (100), the second lens (200), the third lens (300), the fourth lens (400), the fifth lens (500), the prism (800), and the aperture (STOP) may be omitted. The imaging lens may be configured such that a prism (800), an aperture (STOP), a first lens (100), a second lens (200), a third lens (300), a fourth lens (400), and a fifth lens (500) are arranged in order from the object side to the image side. In another embodiment, the imaging lens may be configured such that a prism (800), a first lens (100), a second lens (200), a third lens (300), a fourth lens (400), and a fifth lens (500) are arranged in order from the object side to the image side. The imaging lens according to the third embodiment may be composed of four or fewer lenses. Alternatively, the imaging lens according to the third embodiment may be composed of six or more lenses.

[0096] In another embodiment, one or more of other lenses, flat plates, and optical members may be added between the first lens (100) to the fifth lens (500). Additionally, one or more of other lenses, flat plates, and optical members may be added in front of the first lens (100) or behind the fifth lens (500). Additionally, one or more of other lenses, flat plates, and optical members may be added between the aperture (STOP) and the lens, between the lens and the filter (600), and between the filter (600) and the image sensor (700). In this case, the filter (600) may be a flat lens. The refractive power of the flat lens may be '0'. The refractive power of the flat lens may be zero. Additionally, a filter layer may be placed between the aperture (STOP) and the lens, between the lens and the filter (600), and between the filter (600) and the image sensor (700). In this case, the filter layer may be coated to become a filter.

[0097] For the imaging lens according to the third embodiment, the same reference numerals are used for parts identical to those of the imaging lens according to the first embodiment, and the description is omitted. For parts omitted in the description of the imaging lens according to the third embodiment, the description of the imaging lens according to the first embodiment may be applied by analogy.

[0098] The diameter in the first axis direction of the first lens (100) may be larger than the diameter in the second axis direction of the first lens (100). The diameter in the first axis direction of the first lens (100) may be at least 1.3 times larger than the diameter in the second axis direction of the first lens (100). Through this, an imaging lens with an aperture area equal to or larger than that of a conventional circular symmetric lens can be realized. The diameter in the first axis direction of the first lens (100) may be larger than the diameter in the corresponding direction of the third to fifth lenses (300, 400, 500). The diameter in the first axis direction of the first lens (100) may be larger than the diameter in the corresponding direction of the circular symmetric lens. The diameter in the first axis direction of the first lens (100) may be larger than the diameter in the corresponding direction of the second lens (200). The diameter in the second axis direction of the first lens (100) may be equal to the length in the corresponding direction of the prism (800). The diameter of the first lens (100) in the direction of the second axis may be smaller than the length in the corresponding direction of the prism (800).

[0099] surface No. lens No. Y Radius(mm) X Radius(mm) Thickness (mm) material Index Abbe # 1 First lens 5.35 5.35 3.566 plastic 1.5465 56.09 2 -15.38 -15.50 0.115 3 Second lens 13.77 13.52 2.671 plastic 1.679 19.24 4 3.38 3.69 0.817 5 third lens 2.86 - 0.563 plastic 1.5465 56.09 6 2.77 - 1.282 7 Fourth lens 11.18 - 1.050 plastic 1.679 19.24 8 -103.78 - 0.908 9 Fifth lens -8.95 - 1.100 plastic 1.679 19.24 10 46.47 - 0.392 11 filter Infinity Infinity 0.210 glass 12 Infinity Infinity Image 0.326

[0100] Table 5 shows the optical characteristics of the lenses included in the imaging lens according to the third embodiment of the present invention. More specifically, Table 5 shows the surface number, lens number, Y-radius, X-radius, thickness of the center of each lens or distance between lens surfaces, material, refractive index, and Abbe number of the imaging lens according to the third embodiment of the present invention.

[0101] surface No. lens No. Y aperture (mm) X aperture (mm) Y focal length(mm) X focal length(mm) Shape Refractivepower 1 First lens 7.73 7.45 4.80 8.00 Convex Positive (+) 2 Convex 3 Second lens -7.37 -7.39 4.80 8.00 Convex hmm(-) 4 Gomoku 5 third lens 124.16 - - 4.68 Convex Positive (+) 6 Gomoku 7 Fourth lens 14.91 - - 4.68 Convex Positive (+) 8 Convex 9 Fifth lens -10.95 - 4.80 5.70 Gomoku hmm(-) 10 Gomoku 11 filter 12 Image

[0102] Table 6 shows the optical characteristics of the lens included in the imaging lens according to the third embodiment of the present invention. More specifically, Table 6 shows the surface number, lens number, effective aperture axis (X semi-aperture), effective aperture axis (Y semi-aperture), Y focal length in the Y-axis direction, X focal length in the X-axis direction, the shape of each lens surface, and the refractive power of each lens of the imaging lens according to the third embodiment of the present invention.

[0103]

[0104] Table 7 shows the values ​​of the conic constant (K) of the imaging lens and the aspherical coefficients (A, B, C, D, E, F, G, H, J) of each lens surface according to the third embodiment of the present invention. 1-Y represents the ZY plane of the object side of the first lens (100), and 1-X may represent the XY plane of the object side of the first lens (100). 2-Y represents the ZY plane of the upper side of the first lens (100), and 2-X may represent the XY plane of the upper side of the first lens (100). 3-Y represents the ZY plane of the object side of the second lens (200), and 3-X may represent the XY plane of the object side of the second lens (200). 4-Y may mean the ZY plane of the upper side of the second lens (200), and 4-X may mean the XY plane of the upper side of the second lens (200).

[0105] Referring to Table 7, the third to fifth lenses (300, 400, 500), which are rotationally symmetric lenses, may have a specific aspheric coefficient for every even order. The first lens (100), which is not rotationally symmetric, may have an aspheric coefficient for each x-axis and y-axis. The object side of the first lens (100) may have an aspheric coefficient for each x-axis and y-axis. The upper side of the first lens (100) may have an aspheric coefficient for each x-axis and y-axis. The second lens (200), which is not rotationally symmetric, may have an aspheric coefficient for each x-axis and y-axis. The object side of the second lens (200) may have an aspheric coefficient for each x-axis and y-axis. The upper side of the second lens (200) may have an aspheric coefficient for each x-axis and y-axis.

[0107] Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention may be implemented in other specific forms without changing its technical concept or essential features. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive.

Claims

Claim 1 An imaging lens comprising: a first lens having a positive (+) refractive power; a second lens having a negative (-) refractive power; a third lens having a positive (+) refractive power; a fourth lens having a positive (+) refractive power; and a fifth lens having a negative (-) refractive power, wherein the first to fifth lenses are arranged sequentially from the object side to the upper side, and the first lens includes an object side and an upper side symmetric with respect to a first axis perpendicular to the optical axis and a second axis perpendicular to the optical axis and the first axis, wherein the absolute value of the radius of curvature in the direction of the first axis of the object side of the first lens and the absolute value of the radius of curvature in the direction of the second axis of the object side of the first lens are different from each other, and a prism arranged on the object side of the first lens, wherein the diameter of the first lens in the direction of the second axis is equal to the length in the corresponding direction of the prism. Claim 2 In claim 1, the second lens includes an object side and an image side that are symmetric with respect to the first axis and the second axis, and the absolute value of the radius of curvature in the direction of the first axis of the object side of the second lens and the absolute value of the radius of curvature in the direction of the second axis of the object side of the second lens are different imaging lenses. Claim 3 In claim 1, the third to fifth lenses are circularly symmetrical imaging lenses. Claim 4 An imaging lens according to claim 1, wherein the diameter in the first axis direction of the first lens is larger than the diameter in the second axis direction of the first lens. Claim 5 In claim 1, the diameter of the first lens in the direction of the first axis is larger than the diameter in the corresponding direction of the third to fifth lenses. Claim 6 delete Claim 7 delete Claim 8 An imaging lens according to claim 1, wherein the object side surface of the first lens is convex and the upper side surface of the first lens is convex. Claim 9 An imaging lens according to claim 1, wherein the object side surface of the second lens is concave and the upper side surface of the second lens is concave. Claim 10 An imaging lens according to claim 1, wherein the object side surface of the third lens is convex and the upper side surface of the third lens is concave. Claim 11 An imaging lens according to claim 1, wherein the object side surface of the fourth lens is concave and the upper side surface of the fourth lens is convex. Claim 12 An imaging lens according to claim 1, wherein the object side surface of the fifth lens is convex and the upper side surface of the fifth lens is concave. Claim 13 A camera module comprising an image sensor; an imaging lens of claim 1; and a filter disposed between the image sensor and the imaging lens. Claim 14 A smartphone including the camera module of claim 13. Claim 15 An imaging lens according to claim 1, wherein the absolute value of the radius of curvature in the first axis direction of the object side of the first lens is greater than the absolute value of the radius of curvature in the second axis direction of the object side of the first lens. Claim 16 An imaging lens according to paragraph 2, wherein the absolute value of the radius of curvature in the first axis direction of the object side of the second lens is greater than the absolute value of the radius of curvature in the second axis direction of the object side of the second lens.

Images