Imaging lens system

Abstract

The imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially disposed along an optical axis of the imaging lens system from an object side of the imaging lens system toward an imaging plane of the imaging lens system, in which the second lens has a positive refractive power and is made of a glass material, and the fifth lens is made of a plastic material, the imaging lens system satisfies a conditional expression f number lt; the f number is the f number of the imaging lens system.

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0128342, filed on September 23, 2024, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. Technical Field

[0003] This disclosure relates to an imaging lens system capable of minimizing the phenomenon of reduced incident light in the peripheral portion of the optical axis. Background Technology

[0004] Small surveillance cameras can be configured to capture image information within a monitored area. For example, a small surveillance camera can be mounted on the front bumper, rear bumper, or other parts of a vehicle and can provide the captured images to the driver.

[0005] Early small surveillance cameras were designed to capture images of obstacles near vehicles, and therefore not only had relatively low resolution, but the resolution also varied greatly depending on temperature changes between -40°C and 80°C. To address this issue, small surveillance cameras incorporated lenses made of glass. However, glass lenses could struggle to achieve the incident light angle required by the image sensor of the camera module, resulting in light reduction at the periphery of the optical axis. Utility Model Content

[0006] This summary portion is provided to briefly introduce the selection of concepts, which will be further described in the detailed description portion below. This summary portion is not intended to identify key or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

[0007] In one general aspect, the imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system, wherein the second lens has positive refractive power and is made of glass, the fifth lens is made of plastic, and the imaging lens system satisfies the conditional expression f-number < 2.10, where f-number is the f-number of the imaging lens system.

[0008] The first lens can have negative refractive power.

[0009] The first lens may have a concave object-side surface in its paraxial region.

[0010] The second lens may have a convex object-side surface in its paraxial region.

[0011] The third lens may have a convex object side surface in its paraxial region.

[0012] The fourth lens may have a concave object side surface in its paraxial region.

[0013] The fifth lens may have a negative refractive power.

[0014] The fifth lens may have a convex object side surface in its paraxial region.

[0015] The imaging lens system may satisfy the conditional expression 2.0 < f1 / f5 < 20.0, where f1 is the focal length of the first lens, and f5 is the focal length of the fifth lens.

[0016] In another general aspect, the imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially arranged along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system, where the first lens has a negative refractive power and has a convex image side surface in its paraxial region, the third lens has a convex image side surface in its paraxial region, and the imaging lens system satisfies the conditional expression 4.0 < (R3 + R5) / R10 < 8.0, where R3 is the radius of curvature of the object side surface of the second lens at the optical axis, R5 is the radius of curvature of the object side surface of the third lens at the optical axis, and R10 is the radius of curvature of the image side surface of the fifth lens at the optical axis.

[0017] The first lens may have a concave object side surface in its paraxial region.

[0018] The second lens may have a positive refractive power.

[0019] The second lens may have a convex object side surface in its paraxial region.

[0020] The third lens may have a convex object side surface in its paraxial region.

[0021] The fourth lens may have a concave object side surface in its paraxial region.

[0022] The fifth lens may have a negative refractive power.

[0023] The fifth lens may have a convex object side surface in its paraxial region.

[0024] The imaging lens system may satisfy the conditional expression -10.0 < f1 / f2 < -1.0, where f1 is the focal length of the first lens, and f2 is the focal length of the second lens.

[0025] The imaging lens system may satisfy the conditional expression -3.0 < f1 / f3 < 2.0, where f1 is the focal length of the first lens, and f3 is the focal length of the third lens.

[0026] The imaging lens system can satisfy the conditional expression 2.0 < f1 / f5 < 20.0, where f1 is the focal length of the first lens and f5 is the focal length of the fifth lens.

[0027] Other features and aspects will be apparent from the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a configuration diagram of an imaging lens system according to a first embodiment of the present disclosure.

[0029] Figure 2 shows Figure 1 the aberration curves of the imaging lens system shown in

[0030] Figure 3 is a configuration diagram of an imaging lens system according to a second embodiment of the present disclosure.

[0031] Figure 4 shows Figure 3 the aberration curves of the imaging lens system shown in

[0032] Figure 5 is a configuration diagram of an imaging lens system according to a third embodiment of the present disclosure.

[0033] Figure 6 shows Figure 5 the aberration curves of the imaging lens system shown in

[0034] Figure 7 is a configuration diagram of an imaging lens system according to a fourth embodiment of the present disclosure.

[0035] Figure 8 shows Figure 7 the aberration curves of the imaging lens system shown in

[0036] Figure 9 is a configuration diagram of an imaging lens system according to a fifth embodiment of the present disclosure.

[0037] Figure 10 shows Figure 9 the aberration curves of the imaging lens system shown in

[0038] Throughout the drawings and the detailed description, like reference numerals refer to like elements. For clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative dimensions, proportions, and depictions of elements in the drawings may be exaggerated. DETAILED DESCRIPTION

[0039] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein, except for operations that must occur in a specific order, as will become apparent upon understanding the disclosure of this application. Furthermore, for clarity and conciseness, descriptions of features well-known in the art may be omitted.

[0040] The features described herein may be implemented in various forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein are provided merely to illustrate some of the many possible ways in which the methods, apparatuses, and / or systems described herein will become apparent upon understanding the disclosure of this application.

[0041] 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.

[0042] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more items.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] In this specification, the first lens refers to the lens closest to the object (or target), and the fifth lens refers to the lens closest to the imaging plane (or image sensor). In this specification, the units for the radius of curvature of the lens surface, the thickness of the lens or other component, the distance between lenses or other components, TTL (distance along the optical axis from the object-side surface of the first lens to the imaging plane), IMGHT (height of the imaging plane), and focal length are expressed in millimeters (mm), and the unit for FOV (field of view of the imaging lens system) is expressed in degrees.

[0047] The thickness of the lens or other components, the distance between the lenses or other components, and the TTL are measured along the optical axis.

[0048] Furthermore, in the description of lens shape, stating that "the surface of the lens is convex" means that the paraxial region of the surface is convex, and stating that "the surface of the lens is concave" means that the paraxial region of the surface is concave.

[0049] Therefore, even when the surface of a lens is described as convex, the edge portion of that surface can be concave. Similarly, even when the surface of a lens is described as concave, the edge portion of that surface can be convex.

[0050] The paraxial region of a lens surface is a very narrow area on the lens surface that is close to the optical axis.

[0051] More specifically, the paraxial region of the lens surface is the central portion of the lens surface that surrounds and includes the optical axis of the lens surface, and in the paraxial region of the lens surface, the light rays incident on the lens surface form a small angle θ with the optical axis, and the approximations sinθ≈θ, tanθ≈θ, and cosθ≈1 are valid.

[0052] The imaging lens system according to the first aspect of this disclosure may include multiple lenses. For example, the imaging lens system according to the first aspect may include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. The imaging lens system according to the first aspect may include lenses with positive refractive power. For example, in the imaging lens system according to the first aspect, the second lens may have positive refractive power. The imaging lens system according to the first aspect may include lenses made of glass and lenses made of plastic. For example, in the imaging lens system according to the first aspect, the lens disposed on the object side or the image side of the aperture stop may be made of glass, and the last lens of the imaging lens system may be made of plastic. As a specific example, in the imaging lens system according to the first aspect, the second lens may be made of glass, and the fifth lens may be made of plastic. The imaging lens system according to the first aspect may have an f-number less than 2.10.

[0053] The imaging lens system according to the second aspect of this disclosure may include a plurality of lenses. For example, the imaging lens system according to the second aspect may include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. The imaging lens system according to the second aspect may include lenses having negative refractive power. For example, in the imaging lens system according to the second aspect, the first lens may have negative refractive power. The imaging lens system according to the second aspect may include lenses having a convex image-side surface. For example, in the imaging lens system according to the second aspect, either or both of the image-side surfaces of the first lens and the third lens may have a convex shape. The imaging lens system according to the second aspect may satisfy a specific conditional expression. For example, the imaging lens system according to the second aspect may satisfy the conditional expression 4.0 < (R3 + R5) / R10 < 8.0, where R3 is the radius of curvature of the object-side surface of the second lens at the optical axis, R5 is the radius of curvature of the object-side surface of the third lens at the optical axis, and R10 is the radius of curvature of the image-side surface of the fifth lens at the optical axis.

[0054] The imaging lens system according to the third aspect of the present disclosure may include a plurality of lenses. For example, the imaging lens system according to the third aspect may include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially arranged along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. The imaging lens system according to the third aspect may include an aperture. For example, the imaging lens system according to the third aspect may include an aperture disposed on the object side of the first lens or disposed between the first lens and the second lens. The imaging lens system according to the third aspect may include lenses made of glass materials and lenses made of plastic materials. For example, in the imaging lens system according to the third aspect, the second lens may be made of a glass material, and the fifth lens may be made of a plastic material.

[0055] The imaging lens system according to the fourth aspect of the present disclosure may include a first lens to a fifth lens sequentially arranged along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system, and may satisfy any one or any two or more combinations of the following conditional expressions:

[0056] f - number < 2.10 (Conditional Expression 1)

[0057] -0.80 < f / f4 < 2.0 (Conditional Expression 2)

[0058] -10.0 < f1 / f2 < -1.0 (Conditional Expression 3)

[0059] -3.0 < f1 / f3 < 2.0 (Conditional Expression 4)

[0060] -3.0 < f1 / f4 < 2.0 (Conditional Expression 5)

[0061] 2.0 < f1 / f5 < 20.0 (Conditional Expression 6)

[0062] -0.4 < f2 / f4 < 2.4 (Conditional Expression 7)

[0063] -12 < f3 / f4 < 2.0 (Conditional Expression 8)

[0064] In the above conditional expressions, the f - number is the f - number of the imaging lens system, f is the focal length of the imaging lens system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, and f5 is the focal length of the fifth lens.

[0065] The imaging lens system according to the fifth aspect of the present disclosure may include a first lens to a fifth lens sequentially arranged along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system, and may satisfy any one or any two or more of the following conditional expressions in any combination:

[0066] 4.0 < (R3 + R5) / R10 < 8.0 (conditional expression 9)

[0067] 0 < (R5 + R9) / R10 < 10 (conditional expression 10)

[0068] 1.2 < (R3 + R9 + R10) / f2 < 3.2 (conditional expression 11)

[0069] 1.0 < Nd2 / Nd5 < 1.4 (conditional expression 12)

[0070] 8.0 < |V5 - V2| < 30 (conditional expression 13)

[0071] In the above conditional expressions, R3 is the radius of curvature of the object side surface of the second lens at the optical axis, R5 is the radius of curvature of the object side surface of the third lens at the optical axis, R9 is the radius of curvature of the object side surface of the fifth lens at the optical axis, R10 is the radius of curvature of the image side surface of the fifth lens at the optical axis, Nd2 is the refractive index of the second lens, Nd5 is the refractive index of the fifth lens, V2 is the Abbe number of the second lens, and V5 is the Abbe number of the fifth lens.

[0072] The imaging lens system according to the sixth aspect of the present disclosure may include any combination of any two or more of the first lens to the fifth lens having the following characteristics. For example, the imaging lens system according to the sixth aspect may include the characteristics of the first aspect and may satisfy any one or any two or more of the conditional expressions according to the fourth aspect in any combination. As another example, the imaging lens system according to the sixth aspect may include the characteristics of the second aspect and may satisfy any one or any two or more of the conditional expressions according to the fifth aspect in any combination.

[0073] The imaging lens system according to the first aspect to the sixth aspect may include any combination of any one or any two or more of the first lens to the fifth lens having the following characteristics. As an example, the imaging lens system according to the first aspect may include one of the first lens to the fifth lens having the following characteristics. As another example, the imaging lens system according to the second aspect may include any combination of any two or more of the first lens to the 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 are described below.

[0074] The first lens may have refractive power. For example, the first lens may have negative refractive power. The first lens may have a concave shape on at least one surface. For example, the first lens may have a concave object-side surface, or a concave object-side surface and a concave image-side surface. The first lens may include a spherical surface or an aspherical surface. For example, both surfaces of the first lens may be aspherical. The first lens may be made of a material with high light transmittance and excellent processability. For example, the first lens may be made of a plastic material. The first lens may have a predetermined refractive index. For example, the first lens may have a refractive index of 1.52 or greater. The first lens may have a predetermined Abbe number. For example, the first lens may have an Abbe number of 20 or greater.

[0075] The second lens may have refractive power. For example, the second lens may have positive refractive power. The second lens may have a convex shape on at least one surface. For example, the second lens may have a convex object-side surface, or a convex object-side surface and a convex image-side surface. The second lens may include a spherical surface. For example, both surfaces of the second lens may be spherical. The second lens may be made of a material with high light transmittance and excellent processability. For example, the second lens may be made of glass. The second lens may have a predetermined refractive index. For example, the refractive index of the second lens may be 1.56 or greater. The second lens may have a predetermined Abbe number. For example, the second lens may have an Abbe number of 30 or greater.

[0076] The third lens may have refractive power. For example, the third lens may have positive or negative refractive power. The third lens may have a convex shape on at least one surface. For example, the third lens may have a convex object-side surface, or a convex object-side surface and a convex image-side surface. The third lens may include spherical or aspherical surfaces. For example, both surfaces of the third lens may be aspherical. The third lens may be made of a material with high light transmittance and excellent processability. For example, the third lens may be made of a plastic material. The third lens may have a predetermined refractive index. For example, the refractive index of the third lens may be 1.52 or greater. The third lens may have a predetermined Abbe number. For example, the third lens may have an Abbe number of 58 or greater.

[0077] The fourth lens may have refractive power. For example, the fourth lens may have positive or negative refractive power. The fourth lens may have a concave shape on one surface. For example, the fourth lens may have a concave object-side surface. As another example, the fourth lens may have a convex shape on at least one surface. For example, the fourth lens may have a convex image-side surface, or a convex object-side surface and a convex image-side surface. The fourth lens may include a spherical or aspherical surface. For example, both surfaces of the fourth lens may be aspherical. The fourth lens may be made of a material with high light transmittance and excellent processability. For example, the fourth lens may be made of a plastic material. The fourth lens may have a predetermined refractive index. For example, the refractive index of the fourth lens may be 1.52 or greater. The fourth lens may have a predetermined Abbe number. For example, the fourth lens may have an Abbe number of 20 or greater.

[0078] The fifth lens may have refractive power. For example, the fifth lens may have negative refractive power. The fifth lens may have a convex shape on one surface. For example, the fifth lens may have a convex object-side surface. As another example, the fifth lens may have a concave shape on at least one surface. For example, the fifth lens may have a concave image-side surface, or a concave object-side surface and a concave image-side surface. The fifth lens may include a spherical surface or an aspherical surface. For example, both surfaces of the fifth lens may be aspherical. The fifth lens may be made of a material with high light transmittance and excellent processability. For example, the fifth lens may be made of a plastic material. The fifth lens may have a predetermined refractive index. For example, the refractive index of the fifth lens may be 1.52 or greater. The fifth lens may have a predetermined Abbe number. For example, the fifth lens may have an Abbe number of 20 or greater.

[0079] The aspherical surface of the lens in an imaging lens system can be defined by the following Equation 1:

[0080]

[0081] In Equation 1, c is the curvature of the lens surface, and is equal to the reciprocal of the radius of curvature of the lens surface at the optical axis; k is the quadratic constant; and r is the distance from any point on the aspherical surface of the lens to the optical axis. Furthermore, constants A through H and J are aspherical surface coefficients. Z (also called sag) is the distance in a direction parallel to the optical axis between a point on the aspherical surface of the lens at a distance r from the optical axis and a tangent plane perpendicular to the optical axis and intersecting the vertex of the aspherical surface.

[0082] An imaging lens system may include an aperture, an imaging plane, a filter, and a cover glass.

[0083] An aperture stop can be disposed between two lenses. For example, the aperture stop can be disposed between a first lens and a second lens. As another example, the aperture stop can be disposed on the object side of a lens made of glass material and having positive refractive power. As another example, the aperture stop can be disposed on the object side of the first lens. An imaging surface can be formed at the point where the light refracted by the first lens to the fifth lens forms an image. The imaging surface can be formed by an image sensor. For example, the imaging surface can be formed on the surface of the image sensor or on the inner layer of the image sensor. A filter can be disposed between the fifth lens and the imaging surface. The filter can block certain wavelengths of light. For example, the filter can block infrared wavelengths of light. A cover glass can be disposed between the filter and the imaging surface. The cover glass can be configured to prevent foreign matter from contaminating the surface of the imaging surface (or the image sensor).

[0084] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0085] Figure 1 This is a configuration diagram of an imaging lens system according to a first embodiment of the present disclosure. Figure 2 It shows Figure 1 The aberration curves of the imaging lens system are shown.

[0086] Reference Figure 1 The 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] The first lens 110 may have negative refractive power and may have a concave object-side surface and a convex image-side surface. The second lens 120 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The third lens 130 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The fourth lens 140 may have negative refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 150 may have negative refractive power and may have a convex object-side surface and a concave image-side surface.

[0088] The imaging lens system 100 may further include an aperture stop ST, a filter IF, a cover glass CG, and an imaging surface IP. The aperture stop ST may be disposed between the first lens 110 and the second lens 120. The imaging surface IP may be formed on the image sensor IS, and the filter IF and the cover glass CG may be disposed between the fifth lens 150 and the imaging surface IP.

[0089] Tables 1 and 2 below show the lens characteristics and aspherical values ​​of the imaging lens system 100.

[0090] Table 1

[0091]

[0092] Table 2

[0093]

[0094]

[0095] Figure 3 This is a configuration diagram of an imaging lens system according to a second embodiment of the present disclosure. Figure 4 It shows Figure 3 The aberration curves of the imaging lens system are shown.

[0096] Reference Figure 3 The 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.

[0097] The first lens 210 can have negative refractive power and can have a concave object-side surface and a convex image-side surface. The second lens 220 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The third lens 230 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The fourth lens 240 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The fifth lens 250 can have negative refractive power and can have a convex object-side surface and a concave image-side surface.

[0098] The imaging lens system 200 may further include an aperture stop ST, a filter IF, a cover glass CG, and an imaging surface IP. The aperture stop ST may be disposed between the first lens 210 and the second lens 220. The imaging surface IP may be formed on the image sensor IS, and the filter IF and the cover glass CG may be disposed between the fifth lens 250 and the imaging surface IP.

[0099] Tables 3 and 4 below show the lens characteristics and aspherical values ​​of the imaging lens system 200.

[0100] Table 3

[0101]

[0102]

[0103] Table 4

[0104] Face number S1 S2 S6 S7 k -2.741E+00 -8.822E+00 -1.751E+00 6.321E+01 A 6.805E-03 1.319E-02 -1.239E-02 -1.855E-01 B 3.384E-03 3.795E-03 1.225E-02 7.373E-02 C -5.584E-04 1.375E-04 -1.363E-02 -5.996E-03 D 0.000E+00 0.000E+00 8.095E-03 -5.539E-03 E 0.000E+00 0.000E+00 -2.875E-03 1.768E-03 F 0.000E+00 0.000E+00 5.427E-04 -1.463E-04 G 0.000E+00 0.000E+00 -3.434E-05 0.000E+00 H 0.000E+00 0.000E+00 0.000E+00 0.000E+00 J 0.000E+00 0.000E+00 0.000E+00 0.000E+00 Face number S8 S9 S10 S11 k -4.446E-01 9.000E+01 1.274E+01 -8.092E+00 A -1.648E-01 -4.999E-02 -2.821E-01 -1.167E-01 B 5.384E-02 1.153E-01 1.749E-01 7.501E-02 C 3.213E-02 -1.347E-01 -8.151E-02 -3.882E-02 D -2.815E-02 1.403E-01 2.302E-02 1.433E-02 E 7.971E-03 -8.867E-02 -2.912E-03 -3.796E-03 F -8.113E-04 3.052E-02 0.000E+00 6.310E-04 G 0.000E+00 -4.307E-03 0.000E+00 -4.947E-05 H 0.000E+00 0.000E+00 0.000E+00 0.000E+00 J 0.000E+00 0.000E+00 0.000E+00 0.000E+00

[0105] Figure 5 This is a configuration diagram of an imaging lens system according to a third embodiment of the present disclosure. Figure 6 It shows Figure 5 The aberration curves of the imaging lens system are shown.

[0106] Reference Figure 5 The 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.

[0107] The first lens 310 can have negative refractive power and can have a concave object-side surface and a convex image-side surface. The second lens 320 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The third lens 330 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. The fourth lens 340 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The fifth lens 350 can have negative refractive power and can have a concave object-side surface and a concave image-side surface.

[0108] The imaging lens system 300 may further include an aperture stop ST, a filter IF, a cover glass CG, and an imaging surface IP. The aperture stop ST may be disposed on the object side of the first lens 310. The imaging surface IP may be formed on the image sensor IS, and the filter IF and the cover glass CG may be disposed between the fifth lens 350 and the imaging surface IP.

[0109] Tables 5 and 6 below show the lens characteristics and aspherical values ​​of the imaging lens system 300.

[0110] Table 5

[0111]

[0112] Table 6

[0113] Face number S1 S2 S5 S6 k -3.103E+01 1.747E+00 -5.109E-01 -6.930E-01 A 1.062E-02 -3.590E-02 -2.340E-02 -2.314E-02 B 5.622E-03 1.238E-02 4.932E-03 -1.998E-03 C -4.065E-03 -1.466E-03 -3.790E-04 4.355E-03 D 1.668E-03 2.378E-04 9.572E-05 -2.161E-03 E -2.888E-04 0.000E+00 0.000E+00 4.259E-04 F 0.000E+00 0.000E+00 0.000E+00 0.000E+00 G 0.000E+00 0.000E+00 0.000E+00 0.000E+00 H 0.000E+00 0.000E+00 0.000E+00 0.000E+00 J 0.000E+00 0.000E+00 0.000E+00 0.000E+00 Face number S7 S8 S9 S10 k -2.451E+00 -3.870E+00 -1.000E+01 -9.778E-01 A 1.318E-02 1.651E-02 -2.475E-02 -7.298E-02 B -1.041E-03 -9.798E-03 -1.931E-02 2.134E-02 C 7.967E-04 4.251E-03 9.692E-03 -6.982E-03 D 0.000E+00 0.000E+00 -1.597E-03 1.718E-03 E 0.000E+00 0.000E+00 4.049E-05 -2.459E-04 F 0.000E+00 0.000E+00 0.000E+00 1.385E-05 G 0.000E+00 0.000E+00 0.000E+00 0.000E+00 H 0.000E+00 0.000E+00 0.000E+00 0.000E+00 J 0.000E+00 0.000E+00 0.000E+00 0.000E+00

[0114] Figure 7 This is a configuration diagram of an imaging lens system according to the fourth embodiment of this disclosure. Figure 8 It shows Figure 7 The aberration curves of the imaging lens system are shown.

[0115] Reference Figure 7 The imaging lens system 400 may include a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, and a fifth lens 450.

[0116] The first lens 410 can have negative refractive power and can have a concave object-side surface and a concave image-side surface. The second lens 420 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The third lens 430 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The fourth lens 440 can have positive refractive power and can have a concave object-side surface and a convex image-side surface. The fifth lens 450 can have negative refractive power and can have a convex object-side surface and a concave image-side surface.

[0117] The imaging lens system 400 may further include an aperture stop ST, a filter IF, a cover glass CG, and an imaging surface IP. The aperture stop ST may be disposed between the first lens 410 and the second lens 420. The imaging surface IP may be formed on the image sensor IS, and the filter IF and the cover glass CG may be disposed between the fifth lens 450 and the imaging surface IP.

[0118] Tables 7 and 8 below show the lens characteristics and aspherical values ​​of the imaging lens system 400.

[0119] Table 7

[0120]

[0121] Table 8

[0122]

[0123]

[0124] Figure 9 This is a configuration diagram of an imaging lens system according to the fifth embodiment of this disclosure. Figure 10 It shows Figure 9 The aberration curves of the imaging lens system are shown.

[0125] Reference Figure 9 The imaging lens system 500 may include a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, and a fifth lens 550.

[0126] The first lens 510 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. The second lens 520 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The third lens 530 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The fourth lens 540 can have positive refractive power and can have a concave object-side surface and a convex image-side surface. The fifth lens 550 can have negative refractive power and can have a convex object-side surface and a concave image-side surface.

[0127] The imaging lens system 500 may further include an aperture stop ST, a filter IF, a cover glass CG, and an imaging surface IP. The aperture stop ST may be disposed between the first lens 510 and the second lens 520. The imaging surface IP may be formed on the image sensor IS, and the filter IF and the cover glass CG may be disposed between the fifth lens 550 and the imaging surface IP.

[0128] Tables 9 and 10 below show the lens characteristics and aspherical values ​​of the imaging lens system 500.

[0129] Table 9

[0130]

[0131]

[0132] Table 10

[0133] Face number S1 S2 S6 S7 k -2.298E+01 -2.405E+00 8.850E-01 -1.209E+01 A -3.155E-02 -4.646E-02 -1.167E-02 -5.973E-03 B 2.969E-03 1.403E-02 -2.342E-03 -3.420E-03 C 8.295E-04 -2.872E-03 -2.032E-04 -3.737E-04 D -1.753E-04 5.492E-04 -5.642E-05 2.055E-04 E 0.000E+00 0.000E+00 0.000E+00 0.000E+00 F 0.000E+00 0.000E+00 0.000E+00 0.000E+00 G 0.000E+00 0.000E+00 0.000E+00 0.000E+00 H 0.000E+00 0.000E+00 0.000E+00 0.000E+00 J 0.000E+00 0.000E+00 0.000E+00 0.000E+00 Face number S8 S9 S10 S11 k 4.382E-01 -4.333E+00 -9.000E+01 -5.936E+00 A -1.739E-02 -4.073E-02 -5.724E-02 -4.259E-02 B -1.830E-02 7.055E-03 2.840E-02 1.553E-02 C 1.310E-02 4.187E-03 -6.799E-03 -3.355E-03 D -1.776E-03 -7.295E-04 4.245E-04 2.439E-04 E 0.000E+00 0.000E+00 0.000E+00 0.000E+00 F 0.000E+00 0.000E+00 0.000E+00 0.000E+00 G 0.000E+00 0.000E+00 0.000E+00 0.000E+00 H 0.000E+00 0.000E+00 0.000E+00 0.000E+00 J 0.000E+00 0.000E+00 0.000E+00 0.000E+00

[0134] Tables 11 and 12 below show the optical characteristic values ​​and conditional expression values ​​of the imaging lens systems 100 to 500 according to the first to fifth embodiments.

[0135] Table 11

[0136]

[0137] Table 12

[0138]

[0139] While this disclosure includes specific examples, it will be apparent upon understanding this disclosure that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The description of features or aspects in each example should be considered applicable to similar features or aspects in other examples. Suitable results may still be achieved if the described techniques are performed in a different order, and / or if components in the described system, architecture, device, or circuit are combined in different ways and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of this disclosure is not limited by the specific embodiments but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in this disclosure.

Claims

1. An imaging lens system, characterized in that, The imaging lens system includes: A first lens, a second lens, a third lens, a fourth lens, and a fifth lens are arranged sequentially along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. The second lens has positive refractive power and is made of glass. The fifth lens is made of plastic material, and The imaging lens system satisfies the following conditional expression: f-number < 2.10 Wherein, f-number is the f-number of the imaging lens system.

2. The imaging lens system according to claim 1, characterized in that, The first lens has negative refractive power.

3. The imaging lens system according to claim 1, characterized in that, The first lens has a concave object-side surface in its paraxial region.

4. The imaging lens system according to claim 1, characterized in that, The second lens has a convex object-side surface in its paraxial region.

5. The imaging lens system according to claim 1, characterized in that, The third lens has a convex object-side surface in its paraxial region.

6. The imaging lens system according to claim 1, characterized in that, The fourth lens has a concave object-side surface in its paraxial region.

7. The imaging lens system according to claim 1, characterized in that, The fifth lens has negative refractive power.

8. The imaging lens system according to claim 1, characterized in that, The fifth lens has a convex object-side surface in its paraxial region.

9. The imaging lens system according to claim 1, characterized in that, The imaging lens system satisfies the following conditional expression: 2.0 <f1 / f5<20.0 Where f1 is the focal length of the first lens and f5 is the focal length of the fifth lens.

10. An imaging lens system, characterized in that, The imaging lens system includes: A first lens, a second lens, a third lens, a fourth lens, and a fifth lens are arranged sequentially along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. The first lens has negative refractive power. The first lens has a convex image-side surface in its paraxial region, or the third lens has a convex image-side surface in its paraxial region, and The imaging lens system satisfies the following conditional expression: 4.0 < (R3 + R5) / R10 < 8.0 Wherein, R3 is the radius of curvature of the object side of the second lens at the optical axis, R5 is the radius of curvature of the object side of the third lens at the optical axis, and R10 is the radius of curvature of the image side of the fifth lens at the optical axis.

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

12. The imaging lens system according to claim 10, characterized in that, The second lens has positive refractive power.

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

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

15. The imaging lens system according to claim 10, characterized in that, The fourth lens has a concave object-side surface in its paraxial region.

16. The imaging lens system according to claim 10, characterized in that, The fifth lens has negative refractive power.

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

18. The imaging lens system according to claim 10, characterized in that, The imaging lens system satisfies the following conditional expression: -10.0 <f1 / f2<-1.0 Where f1 is the focal length of the first lens and f2 is the focal length of the second lens.

19. The imaging lens system according to claim 10, characterized in that, The imaging lens system satisfies the following conditional expression: -3.0 <f1 / f3<2.0 Where f1 is the focal length of the first lens and f3 is the focal length of the third lens.

20. The imaging lens system according to claim 10, characterized in that, The imaging lens system satisfies the following conditional expression: 2.0 <f1 / f5<20.0 Where f1 is the focal length of the first lens and f5 is the focal length of the fifth lens.

Images