Image taking lens system

Abstract

The image pickup lens system includes: a first lens having a negative refractive power; a second lens having a positive refractive power while having a convex object side surface; a third lens having a positive refractive power; a fourth lens having a positive refractive power; a fifth lens having a negative refractive power and having a concave object side surface and a concave image side surface; and a sixth lens having a positive refractive power.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2019-0000279, filed with the Korean Intellectual Property Office on January 2, 2019, the entire disclosure of which is incorporated herein by reference for all purposes. Technical Field

[0003] The following description relates to an image-capturing lens system that can achieve constant optical performance independent of temperature changes in the surrounding environment. Background Technology

[0004] Since conventional surveillance cameras installed in vehicles only capture the shape of surrounding objects, they do not require high resolution. However, with the addition of autonomous driving functions to vehicles, lens systems suitable for cameras that can capture distant objects or clearly photograph nearby objects are needed. Summary of the Invention

[0005] The summary portion of this invention is intended to provide a brief overview of the chosen inventive 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 to help determine the scope of the claimed subject matter.

[0006] In one general aspect, an image-capturing lens system includes: a first lens having negative refractive power; a second lens having positive refractive power and a convex object-side surface; a third lens having positive refractive power; a fourth lens having positive refractive power; a fifth lens having negative refractive power and a concave object-side surface and a concave image-side surface; and a sixth lens having positive refractive power. The first to sixth lenses are sequentially arranged from the object side of the image-capturing lens system.

[0007] The image capturing lens system may include an aperture stop disposed between the second lens and the third lens.

[0008] One of the lenses from the third to the sixth lens may be made of glass.

[0009] A lens formed of glass can have positive refractive power.

[0010] Among the first to sixth lenses, four or more lenses may be made of plastic.

[0011] The image capturing lens system can satisfy Gf / f < 2.0, where Gf is the focal length of the lens formed by the glass, and f is the focal length of the image capturing lens system.

[0012] The first lens can include a convex object side surface.

[0013] The image capturing lens system can satisfy 0.7 < BFL / S8S13, where BFL is a distance from an image side surface of the sixth lens to an image plane, and S8S13 is a distance from an object side surface of the fourth lens to the image side surface of the sixth lens.

[0014] The image capturing lens system can satisfy D34 < D23 or D45 < D34, where D23 is a distance from an image side surface of the second lens to an object side surface of the third lens, D34 is a distance from an image side surface of the third lens to an object side surface of the fourth lens, and D45 is a distance from an image side surface of the fourth lens to an object side surface of the fifth lens.

[0015] In another general aspect, an image capturing lens system includes, disposed in order from an object side of the image capturing lens system, a first lens, a second lens, a stop, a third lens, a fourth lens, a fifth lens, and a sixth lens. The third lens or the fourth lens is formed of glass, and the image capturing lens system satisfies 0.7 < BFL / S8S13, where BFL is a distance from an image side surface of the sixth lens to an image plane, and S8S13 is a distance from an object side surface of the fourth lens to the image side surface of the sixth lens.

[0016] The first lens can have a negative refractive power.

[0017] The third lens and the fourth lens can have a positive refractive power.

[0018] The image capturing lens system can satisfy f3 / f < 2.0 and f4 / f < 2.0, where f is a focal length of the image capturing lens system, f3 is a focal length of the third lens, and f4 is a focal length of the fourth lens.

[0019] The second lens can include a convex image side surface.

[0020] The image capturing lens system can satisfy D34 < D23, where D23 is a distance from an image side surface of the second lens to an object side surface of the third lens, and D34 is a distance from an image side surface of the third lens to an object side surface of the fourth lens.

[0021] The image capturing lens system can satisfy D45 < D34, where D34 is a distance from an image side surface of the third lens to an object side surface of the fourth lens, and D45 is a distance from an image side surface of the fourth lens to an object side surface of the fifth lens.

[0022] The third lens can include a concave object side surface.

[0023] Other features and aspects will become apparent from the following detailed description, drawings, and claims. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A configuration of an image capturing lens system according to a first example is shown.

[0025] Figure 2 A configuration of an image capturing lens system according to a first example is shown. Figure 1 Aberration curves of the image capturing lens system shown in

[0026] Figure 3 MTF curves of the image capturing lens system shown in Figure 1 Aberration curves of the image capturing lens system shown in

[0027] Figure 4 A configuration of an image capturing lens system according to a second example is shown.

[0028] Figure 5 A configuration of an image capturing lens system according to a second example is shown. Figure 4 Aberration curves of the image capturing lens system shown in

[0029] Figure 6 MTF curves of the image capturing lens system shown in Figure 4 Aberration curves of the image capturing lens system shown in

[0030] Figure 7 A configuration of an image capturing lens system according to a third example is shown.

[0031] Figure 8 A configuration of an image capturing lens system according to a third example is shown. Figure 7 Aberration curves of the image capturing lens system shown in

[0032] Figure 9 MTF curves of the image capturing lens system shown in Figure 7 Aberration curves of the image capturing lens system shown in

[0033] Figure 10 A configuration of an image capturing lens system according to a fourth example is shown.

[0034] Figure 11 A configuration of an image capturing lens system according to a fourth example is shown. Figure 10 Aberration curves of the image capturing lens system shown in

[0035] Figure 12 MTF curves of the image capturing lens system shown in Figure 10 Aberration curves of the image capturing lens system shown in

[0036] Figure 13 A configuration of an image capturing lens system according to a fifth example is shown.

[0037] Figure 14 A configuration of an image capturing lens system according to a fifth example is shown. Figure 13 Aberration curves of the image capturing lens system shown in

[0038] Figure 15 MTF curves of the image pickup lens system shown in Figure 13 MTF curves of the image pickup lens system shown in

[0039] Figure 16 A configuration of an image pickup lens system according to a sixth example is shown.

[0040] Figure 17 Aberration curves of the image pickup lens system shown in Figure 16 Aberration curves of the image pickup lens system shown in

[0041] Figure 18 MTF curves of the image pickup lens system shown in Figure 16 MTF curves of the image pickup lens system shown in

[0042] Figure 19 A cross-sectional view of a camera module according to an example.

[0043] In all the drawings and detailed description, the same reference numerals refer to the same elements. The drawings can not be to scale and the relative dimensions, proportions, and depiction of the elements in the drawings can be exaggerated for purpose of clarity, illustration, and convenience. DETAILED DESCRIPTION

[0044] The following detailed description is provided to help the reader obtain a thorough understanding of the methods, devices, and / or systems described in this application. However, the methods, devices, and / or systems described in this application can be carried out in various ways, and the various changes, modifications, and equivalents thereof will be apparent to those skilled in the art after an understanding of the disclosure provided in this application. For example, the order of the operations described in this application is merely an example, and is not limited to the order set forth in this application, except for operations that must occur in a specific order, and changes can be made apparent after an understanding of the disclosure provided in this application. In addition, descriptions of features that are well known in the art can be omitted for the sake of clarity and brevity.

[0045] The features described in this application can be implemented in different forms and should not be construed as limited to the examples described in this application. Rather, the examples described in this application are provided merely as a means of describing a number of ways in which the methods, devices, and / or systems described in this application can be implemented, which will be apparent to those skilled in the art after an understanding of the disclosure provided in this application.

[0046] Note that, in this application, the use of the term "may" with respect to examples or embodiments, for example, with respect to what can be included or implemented by the examples or embodiments, means that there is at least one example or embodiment in which the feature is included or implemented, and all examples and embodiments are not limited to this.

[0047] Throughout this specification, when an element such as a layer, region or substrate is referred to as being "on" or "connected to" or "coupled to" another element, it can be directly on, connected or coupled to the other element, or one or more other elements can be interposed therebetween. Conversely, when an element is referred to as being "directly on", "directly connected to", or "directly coupled to" another element, then there are no other elements interposed therebetween.

[0048] As used in this application, the term "and / or" includes any one of the associated listed items, as well as any combination of any two or more of the associated listed items.

[0049] Although terms such as "first", "second", and "third" can be used in this application to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections are not limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section mentioned in an example can also be called a second element, component, region, layer or section without departing from the teachings of the example described in this application.

[0050] Spatially relative terms such as "on", "upper", "lower", "below", and "above" can be used herein for ease of description to describe the relationships of one element to another element as illustrated in the figures. Unless otherwise specified, these spatially relative terms are intended to encompass different orientations of the device in use or operation, in addition to the orientations depicted in the figures. For example, if a device in the figures is turned over, elements described as "above" or "upper" relative to other elements would then be oriented "below" or "lower" relative to the other elements. Thus, the term "above" encompasses both "above" and "below" orientations. The device can be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0051] The terminology used in this application is for the purpose of describing various examples only and is not intended to be limiting of the present disclosure. Unless specifically defined, the terms "a", "an" and "the" are intended to include both singular and plural forms. The terms "including", "comprising" and "having" are intended to be inclusive and mean that there can be additional features, numbers, operations, components, elements, and / or combinations thereof in the examples.

[0052] Due to manufacturing techniques and / or tolerances, variations in the shapes of the structures illustrated in the drawings can occur. Therefore, the examples described in this application are not limited to the specific shapes illustrated in the drawings, but include variations in shapes that occur during manufacturing.

[0053] The features of the examples described in this application can be combined in a variety of ways as will be apparent after an understanding of the principles of the application. Further, although the examples described in this application have a variety of configurations, other configurations are possible in accordance with principles of the application.

[0054] Hereinafter, examples of the disclosure will be described below with reference to the accompanying drawings.

[0055] In examples, the radius of curvature, the thickness, and the focal length of the lens are all expressed in millimeters (mm). In addition, the thickness of the lens and the gap between the lenses are distances measured based on the optical axis of the lens.

[0056] In the description of the lens surface shape, the convexity of the surface of the lens means that the optical axis region of the corresponding surface is convex, and the concavity of the surface of the lens means that the optical axis region of the corresponding surface is concave. Therefore, in the configuration in which the surface of the lens is described as convex, the edge portion of the lens can be concave. In a similar manner, in the configuration in which the surface of the lens is described as concave, the edge portion of the lens can be convex.

[0057] The image capturing lens system can include a plurality of lenses and a stop. For example, the image capturing lens system can include a first lens, a second lens, a stop, a third lens, a fourth lens, a fifth lens, and a sixth lens disposed in order from the object side. In the following description, the configuration of the lenses will be described.

[0058] The first lens can have a refractive power. For example, the first lens can have a negative refractive power.

[0059] The first lens can have a convex surface. For example, the first lens can have a convex object side surface.

[0060] The first lens can be formed of a material having a constant refractive index regardless of temperature change. For example, the first lens can be formed of glass, but the material of the first lens is not limited to glass.

[0061] The first lens can have a predetermined refractive index. For example, the first lens can have a refractive index of 1.7 or more. When the first lens is formed of plastic, the first lens can have a refractive index lower than 1.7. The first lens can have an Abbe number greater than the Abbe number of the second lens. For example, the first lens can have an Abbe number of 45 or more.

[0062] The second lens can have a refractive power. For example, the second lens can have a positive refractive power or a negative refractive power.

[0063] The second lens can have a convex surface. For example, the second lens can have a convex object side surface or a convex image side surface.

[0064] The second lens can include an aspheric surface. For example, both surfaces of the second lens can be aspheric. The second lens can be formed of a material having high light transmittance and excellent workability. For example, the second lens can be formed of plastic.

[0065] The second lens can have a predetermined refractive index. For example, the second lens can have a refractive index of 1.6 or more. The second lens can have a predetermined Abbe number. For example, the second lens can have an Abbe number lower than 23.

[0066] A diaphragm is disposed between the second lens and the third lens. The diaphragm can adjust the intensity of light incident on the imaging surface to clearly capture an image even in a high brightness environment. In addition, the diaphragm can adjust the intensity of light incident on the third lens to the sixth lens to reduce thermal deformation of the lenses caused by the incident light.

[0067] The third lens can have a refractive power. For example, the third lens can have a positive refractive power.

[0068] The third lens can have a convex surface. For example, the third lens can have a convex image side surface. The third lens can have an Abbe number. As an example, the third lens can have an Abbe number of 50 or more.

[0069] The fourth lens can have a refractive power. For example, the fourth lens can have a positive refractive power.

[0070] The fourth lens can have at least one convex surface. For example, at least one of the image side surface and the object side surface of the fourth lens can be convex. The fourth lens can have an Abbe number of 45 or more.

[0071] One of the third lens and the fourth lens can be formed of a material having a constant refractive index independent of temperature change. For example, the third lens can be formed of glass or the fourth lens can be formed of glass.

[0072] The fifth lens can have a refractive power. For example, the fifth lens can have a negative refractive power.

[0073] The fifth lens can have at least one concave surface. For example, both the object side surface and the image side surface of the fifth lens can be concave.

[0074] The fifth lens can include at least one aspheric surface. For example, both the object side surface and the image side surface of the fifth lens can be aspheric. The fifth lens can be formed of a material having high light transmittance and excellent workability. For example, the fifth lens can be formed of plastic. The fifth lens can have a predetermined refractive index. For example, the fifth lens can have a refractive index of 1.6 or more. The fifth lens can have an Abbe number smaller than that of the fourth lens. For example, the fifth lens can have an Abbe number of less than 30.

[0075] The sixth lens can have a refractive power. For example, the sixth lens can have a positive refractive power.

[0076] The sixth lens can have a convex surface. For example, the sixth lens can have a convex object side surface.

[0077] The sixth lens can be formed of a material having high light transmittance and excellent workability. For example, the sixth lens can be formed of plastic, but the material of the sixth lens is not limited to plastic. The sixth lens can include at least one aspheric surface. For example, both the object side surface and the image side surface of the sixth lens can be aspheric.

[0078] The sixth lens can have a predetermined refractive index. For example, the sixth lens can have a refractive index of less than 1.6.

[0079] The image capturing lens system can include one or more aspheric lenses. For example, among the first lens to the sixth lens, four or more lenses can include aspheric surfaces. For example, one of the lenses disposed on the object side surface or the image side surface of the stop can be a spherical lens. The image capturing lens system satisfying the above conditions can be advantageous to achieve high resolution and improve aberration. The aspheric surface can be represented by the following Equation (1).

[0080] Equation (1):

[0081]

[0082] In Equation (1), “c” is the reciprocal of the radius of curvature of each lens, “k” is the conic constant, “r” is the distance from a certain point on the aspheric surface to the optical axis, “A” to “H” are aspheric constants, and “Z” (or SAG) is the distance in the direction of the optical axis from a certain point on the aspheric surface to the vertex of the aspheric surface.

[0083] The image capturing lens system includes an image sensor. The image sensor can be configured to achieve high resolution. The surface of the image sensor can form an imaging surface on which an image is formed.

[0084] The image capturing lens system includes a filter and a protective glass. For example, the filter can be disposed between the sixth lens and the image sensor to filter components that reduce resolution, and the protective glass can block foreign matter.

[0085] The image capturing lens system is configured to significantly reduce temperature-dependent changes in focal length. For example, among the first to sixth lenses, four or more lenses can be formed of plastic, and the other lenses can be formed of glass. One of the lenses formed of glass is disposed between the stop and the imaging plane and has positive refractive power. The image capturing lens system satisfying the above conditions can have constant optical characteristics even at high or low temperatures, and a reduction in manufacturing cost and weight reduction can be achieved.

[0086] The image capturing lens system is configured to satisfy at least one of the following conditional expressions.

[0087] Conditional expression 1 Gf / f < 2.0

[0088] Conditional expression 2 0.7 < BFL / S8S13

[0089] Conditional expression 3 D34 < D23

[0090] Conditional expression 4 D45 < D34

[0091] Conditional expression 5 f3 / f < 2.0

[0092] Conditional expression 6 f4 / f < 2.0

[0093] Conditional expression 7 TL / f < 5.0

[0094] In the conditional expressions, “f” is the focal length of the image capturing lens system, “Gf” is the focal length of the lens formed of glass and disposed closest to the object side among the third to sixth lenses, “BFL” is the distance from the image side surface of the sixth lens to the imaging plane, “S8S13” is the distance from the object side surface of the fourth lens to the image side surface of the sixth lens, D23 is the distance from the image side surface of the second lens to the object side surface of the third lens, D34 is the distance from the image side surface of the third lens to the object side surface of the fourth lens, and D45 is the distance from the image side surface of the fourth lens to the object side surface of the fifth lens, “f3” is the focal length of the third lens, “f4” is the focal length of the fourth lens, and “TL” is the distance from the object side surface of the first lens to the imaging plane.

[0095] In the following description, an image capturing lens system according to various examples will be described.

[0096] Reference will be made to Figure 1 An image capturing lens system 100 according to a first example will be described.

[0097] The image capturing lens system 100 includes a plurality of lenses each having a refractive power. For example, the image capturing lens system 100 includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, and a sixth lens 160.

[0098] The first lens 110 has a negative refractive power, has a convex object side surface and a concave image side surface. The second lens 120 has a positive refractive power, has a convex object side surface and a convex image side surface. The third lens 130 has a positive refractive power, has a concave object side surface and a convex image side surface. The fourth lens 140 has a positive refractive power, has a convex object side surface and a convex image side surface. The fifth lens 150 has a negative refractive power, has a concave object side surface and a concave image side surface. The sixth lens 160 has a positive refractive power, has a convex object side surface and a convex image side surface.

[0099] The image capturing lens system 100 includes a plurality of aspheric lenses. For example, the second lens 120, the third lens 130, the fifth lens 150, and the sixth lens 160 include aspheric surfaces.

[0100] The image capturing lens system 100 includes at least one lens formed of glass to exhibit constant optical performance regardless of temperature change. In Figure 1 In an example, the first lens 110 and the fourth lens 140 are formed of glass, while the other lenses are formed of plastic.

[0101] The image capturing lens system 100 includes a stop ST. The stop ST is disposed between the second lens 120 and the third lens 130. The image capturing lens system 100 includes a filter 170 and a protection glass 180. The filter 170 is disposed between the sixth lens 160 and an imaging surface 190 to block infrared light, while the protection glass 180 blocks foreign matter.

[0102] In the image capturing lens system 100, TL is 14.00 mm and f is 3.20 mm.

[0103] Table (1) lists lens properties of the image capturing lens system 100, Table (2) lists aspheric constants, and Table (3) lists materials, focal lengths, and linear thermal expansion coefficients (CTEs) of each lens. Figure 2 Aberration curves of the image capturing lens system 100 are shown, and Figure 3 is a graph showing modulation transfer function (MTF) properties of the image capturing lens system 100.

[0104] Table (1)

[0105]

[0106] Table (2)

[0107]

[0108]

[0109] Table (3)

[0110] Label Material Focal length CTE (ppm) First lens Glass -3.23428 8 Second lens Plastic 11.84906 66 Third lens Plastic 14.007636 60 Fourth lens Glass 4.606795 8 Fifth lens Plastic -3.675012 71 Sixth lens Plastic 4.50912 60

[0111] In the following text, reference will be made to Figure 4 The image capture lens system 200 is described based on the second example.

[0112] The image capturing lens system 200 includes multiple lenses, each with refractive power. For example, the image capturing lens system 200 includes a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, and a sixth lens 260.

[0113] The first lens 210 has negative refractive power and a convex object-side surface and a concave image-side surface. The second lens 220 has positive refractive power and a convex object-side surface and a concave image-side surface. The third lens 230 has positive refractive power and a convex object-side surface and a convex image-side surface. The fourth lens 240 has positive refractive power and a convex object-side surface and a convex image-side surface. The fifth lens 250 has negative refractive power and a concave object-side surface and a concave image-side surface. The sixth lens 260 has positive refractive power and a convex object-side surface and a convex image-side surface.

[0114] The image capturing lens system 200 includes multiple aspherical lenses. For example, the second lens 220, the fourth lens 240, the fifth lens 250, and the sixth lens 260 include aspherical surfaces.

[0115] The image capturing lens system 200 includes at least one lens formed of glass to exhibit constant optical performance independent of temperature changes. Figure 4 In the example, the first lens 210 and the third lens 230 are made of glass, while the other lenses are made of plastic.

[0116] The image capturing lens system 200 includes an aperture stop ST. The aperture stop ST is disposed between the second lens 220 and the third lens 230. The image capturing lens system 200 includes a filter 270 and a protective glass 280. The filter 270 is disposed between the sixth lens 260 and the imaging surface 290 to block infrared light, while the protective glass 280 blocks foreign objects.

[0117] In the image capturing lens system 200, TL is 14.00mm and f is 3.20mm.

[0118] Table (4) lists lens characteristics of the image capturing lens system 200, Table (5) lists aspherical constants, and Table (6) lists materials, focal lengths, and linear thermal expansion coefficients (CTEs) of each lens. Figure 5 Aberration curves of the image capturing lens system 200 are shown, and Figure 6 is a graph showing MTF characteristics of the image capturing lens system 200.

[0119] Table (4)

[0120]

[0121] Table (5)

[0122]

[0123]

[0124] Table (6)

[0125] Label Material Focal length CTE (ppm) First lens Glass -2.879873 8 Second lens Plastic 61.251329 66 Third lens Glass 3.727968 8 Fourth lens Plastic 13.26758 60 Fifth lens Plastic -4.800192 66 Sixth lens Plastic 5.286187 60

[0126] An image capturing lens system 300 according to a third example will be described with reference to Figure 7 An image capturing lens system 300 according to a third example will be described with reference to

[0127] The image capturing lens system 300 includes a plurality of lenses each having a refractive power. For example, the image capturing lens system 300 includes a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, and a sixth lens 360.

[0128] The first lens 310 has a negative refractive power, has a convex object side surface and a concave image side surface. The second lens 320 has a negative refractive power, has a concave object side surface and a convex image side surface. The third lens 330 has a positive refractive power, has a convex object side surface and a convex image side surface. The fourth lens 340 has a positive refractive power, has a convex object side surface and a convex image side surface. The fifth lens 350 has a negative refractive power, has a concave object side surface and a concave image side surface. The sixth lens 360 has a positive refractive power, has a convex object side surface and a concave image side surface.

[0129] The image capturing lens system 300 includes a plurality of aspherical lenses. For example, the first lens 310, the second lens 320, the fourth lens 340, the fifth lens 350, and the sixth lens 360 include aspherical surfaces.

[0130] The image capturing lens system 300 includes lenses formed of glass to exhibit constant optical performance regardless of temperature change. In Figure 7 In the example, the third lens 330 is formed of glass, while the other lenses are formed of plastic.

[0131] The image capturing lens system 300 includes a stop ST. The stop ST is disposed between the second lens 320 and the third lens 330. The image capturing lens system 300 includes a filter 370 and a protection glass 380. The filter 370 is disposed between the sixth lens 360 and an imaging surface 390 to block infrared light, and the protection glass 380 blocks foreign matter.

[0132] In the image capturing lens system 300, TL is 14.00 mm and f is 3.244 mm.

[0133] Table (7) lists the lens properties of the image capturing lens system 300, Table (8) lists the aspherical constants, and Table (9) lists the material, focal length, and linear thermal expansion coefficient (CTE) of each lens. Figure 8 Aberration curves of the image capturing lens system 300 are shown, and Figure 9 is a graph showing the MTF properties of the image capturing lens system 300.

[0134] Table (7)

[0135]

[0136] Table (8)

[0137] Face number K A B C D 1 -7.681703 0.002013 -0.000288 0.000025 - 2 0.061406 -0.000388 0.000518 -0.000389 - 3 0.5422 0.004976 0.000134 - - 4 -0.211763 0.002146 -0.000167 - - 8 -22.17865 0.007454 -0.000645 0.000011 - 9 -2.361881 0.001728 -0.000264 0.000014 - 10 3.825378 -0.00665 -0.000113 0.000164 -0.000011 11 -1.851574 -0.00174 -0.000081 0.000118 -0.000009 12 -1.778214 0.00078 -0.000226 0.000012 - 13 0.96103 -0.011395 0.001474 -0.00014 0.000005

[0138] Table (9)

[0139] Label Material Focal length CTE (ppm) First lens Plastic -5.118755 60 Second lens Plastic -20.45832 66 Third lens Glass 5.820223 8 Fourth lens Plastic 4.347073 60 Fifth lens Plastic -4.83182 66 Sixth lens Plastic 10.414383 60

[0140] An image capturing lens system 400 according to a fourth example will be described with reference to Figure 10 An image capturing lens system 400 according to a fourth example will be described with reference to

[0141] The image capturing lens system 400 includes a plurality of lenses each having a refractive power. For example, the image capturing lens system 400 includes a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, and a sixth lens 460.

[0142] The first lens 410 has a negative refractive power, has a convex object side surface and a concave image side surface. The second lens 420 has a negative refractive power, has a concave object side surface and a convex image side surface. The third lens 430 has a positive refractive power, has a convex object side surface and a convex image side surface. The fourth lens 440 has a positive refractive power, has a convex object side surface and a convex image side surface. The fifth lens 450 has a negative refractive power, has a concave object side surface and a concave image side surface. The sixth lens 460 has a positive refractive power, has a convex object side surface and a convex image side surface.

[0143] The image capturing lens system 400 includes a plurality of aspheric lenses. For example, the first lens 410, the second lens 420, the fourth lens 440, the fifth lens 450, and the sixth lens 460 include aspheric surfaces.

[0144] The image capturing lens system 400 includes lenses formed of glass to exhibit constant optical performance independent of temperature changes. In Figure 10 In an example, the third lens 430 is formed of glass, while the other lenses are formed of plastic.

[0145] The image capturing lens system 400 includes a stop ST. The stop ST is disposed between the second lens 420 and the third lens 430. The image capturing lens system 400 includes a filter 470 and a protection glass 480. The filter 470 is disposed between the sixth lens 460 and an imaging plane 490 to block infrared light, while the protection glass 480 blocks foreign matter.

[0146] In the image capturing lens system 400, TL is 14.00 mm and f is 3.23 mm.

[0147] Table (10) lists lens properties of the image capturing lens system 400, Table (11) lists aspheric constants, and Table (12) lists materials, focal lengths, and linear thermal expansion coefficients (CTEs) of each lens. Figure 11 Aberration curves of the image capturing lens system 400 are shown, and Figure 12 is a graph showing MTF characteristics of the image capturing lens system 400.

[0148] Table (10)

[0149]

[0150] Table (11)

[0151] Face number K A B C 1 -7.681703 0.001478 -0.000152 0.000011 2 0.061406 -0.000781 0.000079 -0.000256 3 0.5422 0.004871 0.000294 0 4 -0.211763 0.003197 -0.000192 0 8 -22.17865 0.006723 -0.000393 -0.000016 9 -2.361881 0.000913 -0.000116 -0.000004 10 3.825378 -0.003579 0.000122 0.000049 11 -1.851574 -0.000421 0.000531 -0.000031 12 -1.778214 0.000251 0.000062 -0.000009 13 0.96103 -0.007494 0.00069 -0.000033

[0152] Table (12)

[0153] Label Material Focal length CTE (ppm) First lens Plastic -5.036333 60 Second lens Plastic -34.20897 66 Third lens Glass 6.0078 8 Fourth lens Plastic 4.846766 60 Fifth lens Plastic -5.064417 66 Sixth lens Plastic 8.679575 60

[0154] An image capturing lens system 500 according to a fifth example will be described with reference to Figure 13 An image capturing lens system 500 according to a fifth example will be described with reference to

[0155] The image capturing lens system 500 includes a plurality of lenses each having a refractive power. For example, the image capturing lens system 500 includes a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, and a sixth lens 560.

[0156] The first lens 510 has a negative refractive power, has a convex object side surface and a concave image side surface. The second lens 520 has a positive refractive power, has a convex object side surface and a concave image side surface. The third lens 530 has a positive refractive power, has a concave object side surface and a convex image side surface. The fourth lens 540 has a positive refractive power, has a convex object side surface and a convex image side surface. The fifth lens 550 has a negative refractive power, has a concave object side surface and a concave image side surface. The sixth lens 560 has a positive refractive power, has a convex object side surface and a convex image side surface.

[0157] The image capturing lens system 500 includes a plurality of aspheric lenses. For example, the first lens 510, the second lens 520, the fourth lens 540, the fifth lens 550, and the sixth lens 560 include aspheric surfaces.

[0158] The image capturing lens system 500 includes lenses formed of glass to exhibit constant optical performance regardless of temperature change. In Figure 13 In an example, the third lens 530 is formed of glass, while the other lenses are formed of plastic.

[0159] The image capturing lens system 500 includes a stop ST. The stop ST is disposed between the second lens 520 and the third lens 530. The image capturing lens system 500 includes a filter 570 and a protection glass 580. The filter 570 is disposed between the sixth lens 560 and an imaging plane 590 to block infrared light, while the protection glass 580 blocks foreign matter.

[0160] In the image capturing lens system 500, TL is 14.00 mm and f is 3.20 mm.

[0161] Table (13) lists lens properties of the image capturing lens system 500, Table (14) lists aspheric constants, and Table (15) lists materials, focal lengths, and linear thermal expansion coefficients (CTEs) of each lens. Figure 14 Aberration curves of the image capturing lens system 500 are shown, and Figure 15 is a graph showing MTF characteristics of the image capturing lens system 500.

[0162] Table (13)

[0163]

[0164] Table (14)

[0165] Face number K A B C 1 0 -0.002362 0.000071 0 2 -0.070237 -0.000027 -0.000937 0 3 -1.91777 0.000235 -0.000089 0.000274 4 0.92986 0.006087 0.001455 0.000122 8 -54.81723 -0.00522 0.000173 -0.000008 9 22.549235 -0.027239 0.002578 -0.000153 10 6.951181 -0.009539 0.000136 0 11 -25.81716 0.007946 -0.001059 0.000042 12 -8.669333 -0.001414 0.000379 -0.000014 13 -24.61728 -0.005844 0.00017 0.00002

[0166] Table (15)

[0167]

[0168]

[0169] Reference Figure 16 The image capturing lens system 600 is described according to the sixth example.

[0170] The image capturing lens system 600 includes multiple lenses, each with refractive power. For example, the image capturing lens system 600 includes a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, a fifth lens 650, and a sixth lens 660.

[0171] The first lens 610 has negative refractive power and a concave object-side surface and a concave image-side surface. The second lens 620 has positive refractive power and a convex object-side surface and a concave image-side surface. The third lens 630 has positive refractive power and a concave object-side surface and a convex image-side surface. The fourth lens 640 has positive refractive power and a convex object-side surface and a convex image-side surface. The fifth lens 650 has negative refractive power and a concave object-side surface and a concave image-side surface. The sixth lens 660 has positive refractive power and a convex object-side surface and a convex image-side surface.

[0172] The image capturing lens system 600 includes multiple aspherical lenses. For example, the first lens 610, the second lens 620, the fourth lens 640, the fifth lens 650, and the sixth lens 660 include aspherical surfaces.

[0173] The image capturing lens system 600 includes a lens formed of glass to exhibit constant optical performance independent of temperature changes. Figure 16 In the example, the third lens 630 is made of glass, while the other lenses are made of plastic.

[0174] The image capturing lens system 600 includes an aperture stop ST. The aperture stop ST is disposed between the second lens 620 and the third lens 630. The image capturing lens system 600 includes a filter 670 and a protective glass 680. The filter 670 is disposed between the sixth lens 660 and the imaging surface 690 to block infrared light, while the protective glass 680 blocks foreign objects.

[0175] In the image capturing lens system 600, TL is 14.00mm and f is 3.20mm.

[0176] Table (16) lists the lens characteristics of the image capturing lens system 600, Table (17) lists the aspherical constants, and Table (18) lists the material, focal length, and coefficient of linear thermal expansion (CTE) of each lens. Figure 17 The aberration curves of the image capturing lens system 600 are shown, and Figure 18 This is a graph showing the MTF characteristics of the image capturing lens system 600.

[0177] Table (16)

[0178]

[0179] Table (17)

[0180] Face number K A B C 1 0 0.000011 -0.000032 0 2 -0.070237 -0.001152 -0.00015 0 3 -1.91777 0.001147 -0.000301 0.000675 4 0.92986 0.004549 -0.00026 0.000653 8 -54.81723 0.002066 0.000217 -0.00002 9 22.549235 -0.027599 0.002957 -0.000119 10 6.951181 -0.01325 0.000595 0 11 -25.81716 -0.001702 0.001055 -0.000045 12 -8.669333 -0.007171 0.001496 -0.000066 13 -52.60729 -0.003063 0.000116 0.000002

[0181] Table (18)

[0182]

[0183]

[0184] In an image capturing lens system, the focal lengths of the first through sixth lenses can be determined within a predetermined range. For example, the focal length of the first lens can be determined to be in the range of -6.2mm to -1.8mm, the focal length of the second lens can be determined to be 10mm or greater or -20mm or less, the focal length of the third lens can be determined to be in the range of 2.7mm to 16.0mm, the focal length of the fourth lens can be determined to be in the range of 3.6mm to 14.0mm, the focal length of the fifth lens can be determined to be in the range of -7.5mm to -2.6mm, and the focal length of the sixth lens can be determined to be in the range of 3.4mm to 13.0mm.

[0185] The image capturing lens system satisfies at least one of the conditional expressions described above. Table (19) lists the values ​​of the conditional expressions for the image capturing lens systems according to the various examples.

[0186] Table (19)

[0187] First example Second example Third example Fourth example Fifth example Sixth example Gf / f 1.4396 1.1650 1.7942 1.8600 1.6754 1.7554 BFL / S8S13 1.0666 1.2277 0.7230 0.8749 1.1718 1.2561 f3 / f 4.3774 1.1650 1.7942 1.8600 1.6754 1.7554 f4 / f 1.4396 4.1461 1.3400 1.5005 4.5200 3.8010 TL / f 4.3741 4.3753 4.3157 4.3344 4.3759 4.3747

[0188] Reference Figure 19 The description is based on the example camera module 10.

[0189] Camera module 10 includes one or more image capturing lens systems according to the above examples (e.g., Figure 19 The image capturing lens system shown has a configuration as described in the image capturing lens system 100 according to the first example. The camera module 10 is configured such that the optical performance of the image capturing lens system remains constant regardless of temperature changes. For example, the camera module 10 includes a lens barrel 20 and a housing 30 with different linear coefficients of thermal expansion. The linear coefficient of thermal expansion of the lens barrel 20 is 2 × 10⁻⁶. -5 Up to 8×10 -5 Furthermore, the linear thermal expansion coefficient of the shell 30 is 2 × 10⁻⁶. -5 Up to 8×10 -5Although the range of the linear thermal expansion coefficient of the lens barrel 20 is the same as the range of the linear thermal expansion coefficient of the housing 30, the lens barrel 20 and the housing 30 in the camera module 10 according to the example are selected to have different linear thermal expansion coefficients.

[0190] The camera module 10 is configured to house a lens portion of the image capturing lens system 100 and an imaging surface (image sensor) 190, respectively. For example, the lens portion of the image capturing lens system 100 is housed in the lens barrel 20, while the imaging surface 190 of the image capturing lens system 100 is housed in the housing 30. The housing 30 can further include an additional substrate 40 to support the imaging surface 190.

[0191] The length of the lens barrel 20 can be determined based on a change in the back focal length (BFL) of the image capturing lens system 100 with temperature. For example, a distance hi from the joint position B of the lens barrel 20 and the housing 30 to the lower end of the lens barrel 20 can be determined based on the BFL of the image capturing lens system 100, the linear thermal expansion coefficient of the lens barrel 20, and the like. Alternatively, the distance hi from the joint position B of the lens barrel 20 and the housing 30 to the lower end of the lens barrel 20 can be determined by a difference between the linear thermal expansion coefficient of the lens barrel 20 and the linear thermal expansion coefficient of the housing 30.

[0192] Similarly, the joint position B of the lens barrel 20 and the housing 30 can be determined based on a change in the BFL of the image capturing lens system 100 with temperature. For example, a distance h2 from the joint position B to the imaging surface 190 can be determined based on the BFL of the image capturing lens system 100, the linear thermal expansion coefficient of the lens barrel 20, and the like. Alternatively, the distance h2 from the joint position B to the imaging surface 190 can be determined by a difference between the linear thermal expansion coefficient of the lens barrel 20 and the linear thermal expansion coefficient of the housing 30.

[0193] As described above, the image capturing lens system according to the example can exhibit constant optical performance regardless of a change in temperature of the surrounding environment.

[0194] While the present disclosure includes specific examples, it will be apparent to one skilled in the art, after an understanding of the disclosure herein, that various changes in form and details can be made without departing from the spirit and scope of the claims and their equivalents. The examples described herein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects in each example should be considered as being applicable to similar features or aspects in other examples. Suitable results can be achieved if the described techniques are performed in a different order, and / or if the described systems, architectures, devices, or circuits are combined or substituted with other components or their equivalents. Therefore, the scope of the disclosure should not be defined by the specific examples, but should be understood to include any and all variations that are within the scope of the claims and their equivalents.

Claims

1. An image capturing lens system comprising: a first lens having a negative refractive power; a second lens having a positive refractive power; a third lens having a positive refractive power and a convex image side surface; a fourth lens having a positive refractive power; a fifth lens having a negative refractive power; and a sixth lens having a positive refractive power, wherein the first lens to the sixth lens are sequentially arranged from an object side toward an image plane, wherein the image capturing lens system has a total of six lenses, wherein 4.3157 < TL / f < 5.0, where TL is a distance from the object side of the first lens to the image plane, and f is a focal length of the image capturing lens system, and wherein the sixth lens has a focal length of 3.4 mm to 13 mm. D34 < D23, where D23 is a distance from an image side surface of the second lens to an object side surface of the third lens, and D34 is a distance from an image side surface of the third lens to an object side surface of the fourth lens.

2. The image capturing lens system of claim 1, wherein, The first lens has a concave object side surface.

3. The image capturing lens system of claim 1, wherein, The second lens has a convex object side surface.

4. The image capturing lens system of claim 1, wherein, The third lens has a convex object side surface.

5. The image-capturing lens system of claim 1, wherein, The fourth lens has a convex object side surface.

6. The image capturing lens system of claim 1, wherein, The fifth lens has a concave object side surface.

7. The image-capturing lens system of claim 1, wherein, The sixth lens has a convex object side surface.

8. The image-capturing lens system of claim 1, wherein, The sixth lens has a concave image side surface.

9. The image-capturing lens system of claim 1, wherein, 10. An image capturing lens system comprising: a first lens having a negative refractive power; a second lens having a positive refractive power; a third lens having a positive refractive power and a convex image side surface; a fourth lens having a positive refractive power; a fifth lens having a negative refractive power; and a sixth lens having a positive refractive power, wherein the first lens to the sixth lens are sequentially arranged from an object side toward an image plane, wherein the image capturing lens system has a total of six lenses, wherein f3 / f < 2.0, and 4.3157 < TL / f < 5.0, where f is a focal length of the image capturing lens system, f3 is a focal length of the third lens, and TL is a distance from the object side of the first lens to the image plane, and wherein the sixth lens has a focal length of 3.4 mm to 13 mm. At least one of the third lens to the sixth lens is formed of glass, and wherein Gf / f < 2.0, where Gf is a focal length of the lens among the third lens to the sixth lens that is formed of glass and disposed closest to the object side.

11. The image capturing lens system of claim 10, wherein, f4 / f < 2.0, where f4 is a focal length of the fourth lens. The first lens has a focal length of -6.2 mm to -1.8 mm.

12. The image capturing lens system of claim 10, wherein, The third lens has a focal length of 2.7 mm to 16 mm.

13. The image-capturing lens system of claim 10, wherein, ​ 14. The image-capturing lens system of claim 10, wherein, ​

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