Imaging lens system

Abstract

The imaging lens system includes: a first lens including a positive refractive power and a convex object side surface; a second lens including a negative refractive power and a convex object side surface; a third lens including refractive power; a fourth lens including negative refractive power; a fifth lens including refractive power; a sixth lens including negative refractive power; and a seventh lens including a positive refractive power, in which the first to seventh lenses are sequentially disposed from the object side toward the imaging surface, in which the number of lenses having refractive powers in the imaging lens system is 7, in which the refractive powers of the third lens and the fifth lens are one of negative negative, negative positive, and positive and negative, and in which 0.1 lt; l < 1 > w / L < 7 > wlt; 0.5, where L1w is the weight of the first lens, and L7w is the weight of the seventh lens.

Description

[0001] Cross - reference to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10 - 2019 - 0015653, filed with the Korean Intellectual Property Office on February 11, 2019, the entire disclosure of which is incorporated herein by reference for all purposes. Technical field

[0003] The following description relates to an imaging lens system having seven lenses. Background art

[0004] Compact cameras are usually mounted on wireless terminals. For example, a compact camera can be mounted on the front and rear surfaces of such wireless terminals. Since such camera modules are used for various purposes, such as outdoor landscape photos, indoor portrait photos, etc., the performance of the compact camera is required to be not lower than that of a normal camera. However, since the installation space of the camera module is limited by the size of the wireless terminal, it is difficult to achieve a high level of performance. Therefore, there is a need to develop an imaging lens system that can improve the performance of the compact camera without increasing the size of the compact camera. Summary of the invention

[0005] The present Summary of the Invention section is intended to introduce, in a brief form, a selection of inventive concepts, which will be further described in the Detailed Description section below. The present Summary of the Invention section is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to assist in determining the scope of the claimed subject matter.

[0006] An imaging lens system capable of improving the performance of a compact camera.

[0007] In one general aspect, the imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially arranged from the object side. The imaging lens system satisfies TTL / f < 1.0 and D23 / D34 < 1.2, where TTL is the distance from the object side surface of the first lens to the imaging surface, f is the focal length of the imaging lens system, D23 is the distance from the image side surface of the second lens to the object side surface of the third lens, and D34 is the distance from the image side surface of the third lens to the object side surface of the fourth lens.

[0008] The first lens may include a convex image side surface.

[0009] The fourth lens may include a convex image side surface, or the fifth lens may include a convex object side surface.

[0010] Four or more of the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens may have negative refractive power.

[0011] The sixth lens may include a convex object side or a convex image side.

[0012] The imaging lens system may satisfy 1.9 < TTL / (IMG_HT) < 2.2, where IMG_HT is half of the diagonal length of the imaging plane.

[0013] The refractive index of the fourth lens and the refractive index of the fifth lens may be 1.6 or greater.

[0014] In another general aspect, the imaging lens system includes: a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a concave image side; a fourth lens having a negative refractive power; a fifth lens having a refractive power; a sixth lens having a negative refractive power; and a seventh lens having a positive refractive power. The first lens to the seventh lens are sequentially arranged from the object side. The imaging lens system satisfies 0.15 < D56 / TTL, where D56 is the distance from the image side of the fifth lens to the object side of the sixth lens, and TTL is the distance from the object side of the first lens to the imaging plane.

[0015] The fifth lens may include a convex object side or a convex image side.

[0016] The seventh lens may include a convex object side.

[0017] The distance D56 from the image side of the fifth lens to the object side of the sixth lens may be greater than the distance from the image side of the first lens to the object side of the second lens, the distance from the image side of the second lens to the object side of the third lens, the distance from the image side of the third lens to the object side of the fourth lens, the distance from the image side of the fourth lens to the object side of the fifth lens, and the distance from the image side of the sixth lens to the object side of the seventh lens.

[0018] The distance from the image side of the first lens to the object side of the second lens may be less than the distance from the image side of the fourth lens to the object side of the fifth lens.

[0019] The refractive index of the fourth lens and the refractive index of the fifth lens may be 1.6 or greater.

[0020] At least four of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens may have a refractive index of 1.6 or greater.

[0021] The third lens or the fifth lens may have a negative refractive power.

[0022] According to the following detailed description, the drawings, and the appended claims, other features and aspects will become apparent. Description of the Drawings

[0023] Figure 1 It is a configuration diagram of an imaging lens system according to the first example.

[0024] Figure 2 It shows Figure 1 the aberration curves of the imaging lens system shown in

[0025] Figure 3 It is a diagram showing Figure 1 the connection state of the imaging lens system and the lens barrel shown in

[0026] Figure 4 It is a configuration diagram of an imaging lens system according to the second example.

[0027] Figure 5 It shows Figure 4 the aberration curves of the imaging lens system shown in

[0028] Figure 6 It is a diagram showing Figure 4 the connection state of the imaging lens system and the lens barrel shown in

[0029] Figure 7 It is a configuration diagram of an imaging lens system according to the third example.

[0030] Figure 8 It shows Figure 7 the aberration curves of the imaging lens system shown in

[0031] Figure 9 It is a diagram showing Figure 7 the connection state of the imaging lens system and the lens barrel shown in

[0032] Figure 10 It is a configuration diagram of an imaging lens system according to the fourth example.

[0033] Figure 11 It shows Figure 10 the aberration curves of the imaging lens system shown in

[0034] Figure 12 It is a diagram showing Figure 10 the connection state of the imaging lens system and the lens barrel shown in

[0035] Figure 13 It is a configuration diagram of an imaging lens system according to the fifth example.

[0036] Figure 14 It shows Figure 13 the aberration curves of the imaging lens system shown in

[0037] Figure 15 It is a diagram showing Figure 13Connection state diagram of the imaging lens system and the lens barrel shown therein.

[0038] In all the drawings and the detailed description, the same reference numerals refer to the same elements. For clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative sizes, proportions, and depictions of elements in the drawings may be exaggerated. Detailed Description

[0039] The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, apparatuses, and / or systems described in this application. However, various changes, modifications, and equivalents of the methods, apparatuses, and / or systems described in this application will be apparent to those of ordinary skill in the art. The order of operations described in this application is merely exemplary and, except for operations that must occur in a specific order, is not limited to the order set forth in this application and may be changed, which will be apparent to those of ordinary skill in the art. Additionally, descriptions of functions and structures known to those of ordinary skill in the art may be omitted for greater clarity and conciseness.

[0040] The features described in this application may 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 so that this disclosure will be thorough and complete and will fully convey the scope of this disclosure to those of ordinary skill in the art.

[0041] It should be noted that in this application, the use of the phrase "may" with respect to an example or embodiment, e.g., with respect to what an example or embodiment may include or implement, means that there is at least one example or embodiment in which such a feature is included or implemented, and not all examples and embodiments are limited thereto.

[0042] Throughout the specification, when an element such as a layer, region, or substrate is described as being "on," "connected to," or "coupled to" another element, the element may be directly "on," directly "connected to," or directly "coupled 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 coupled to" another element, there may be no other elements between the element and the other element.

[0043] As used in this application, the phrase "and / or" includes any one of the associated listed items and any combination of any two or more of them.

[0044] Although terms such as "first", "second", and "third" may be used in this application to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited by these terms. Rather, these terms are only used to distinguish one component, part, region, layer, or section from another. Thus, without departing from the teachings of the examples described in this application, the first component, first part, first region, first layer, or first section mentioned in that example could also be referred to as the second component, second part, second region, second layer, or second section.

[0045] Spatial relative terms such as "above", "upper", "below", and "lower" may be used in this application for convenience of description to describe the relationship of one element relative to another as shown in the figures. In addition to covering the orientations depicted in the figures, these spatial relative terms are intended to also cover different orientations of the device during use or operation. For example, if the device in the figures is flipped, an element described as "above" or "upper" relative to another element will be "below" or "lower" relative to that other element. Thus, depending on the spatial orientation of the device, the term "above" covers both the orientation 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 in this application should be interpreted accordingly.

[0046] The terms used in this application are only for describing various examples and are not intended to limit the disclosure. Unless the context clearly indicates otherwise, the articles "a", "an", and "the" are intended to also include the plural forms. The terms "comprising", "including", and "having" specify the presence of the stated features, numbers, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, components, elements, and / or combinations thereof.

[0047] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the figures may occur. Thus, the examples described in this application are not limited to the specific shapes shown in the figures, but include shape variations that occur during manufacturing.

[0048] The features of the examples described in this application may be combined in various ways that will be apparent after understanding the disclosure of this application. In addition, although the examples described in this application have various configurations, other configurations that will be apparent after understanding the disclosure of this application are also possible.

[0049] Hereinafter, examples will be described as follows with reference to the figures.

[0050] However, the present disclosure may be illustrated in many different forms and should not be construed as limited to the specific examples set forth in this application.

[0051] In this application, the first lens refers to the lens closest to the object (or subject), and the seventh lens refers to the lens closest to the imaging surface (or image sensor). In this application, the radius of curvature, the thickness of the lens, the TTL (distance from the object side surface of the first lens to the imaging surface), the IMG_HT (1 / 2 of the diagonal length of the imaging surface), and the focal length of the lens may be expressed in millimeters (mm).

[0052] The thickness of the lens, the interval between lenses, and the TTL are distances on the optical axis of the lens. Additionally, when explaining the shape of each lens, a convex shape on one surface may indicate that the paraxial region of that surface is convex, while a concave shape on one surface may indicate that the paraxial region of that surface is concave. Thus, even when one surface of a lens is described as having a convex shape, the edge portion of the lens may be concave. Similarly, even when one surface of a lens is described as having a concave shape, the edge portion of the lens may be convex.

[0053] The imaging lens system includes seven lenses. For example, the imaging lens system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially arranged from the object side. The first lens to the seventh lens may be arranged at a predetermined interval. For example, each lens does not contact the image side surface and the object side surface of the adjacent lens in the paraxial region. Thus, in the drawings, although the image side surface of a lens on one side and the object side surface of a lens on the other side are shown as contacting, the image side surface and the object side surface between the two lenses do not actually contact.

[0054] The first lens has refractive power. For example, the first lens has positive refractive power. One surface of the first lens may be convex. For example, the first lens may have a convex object side surface.

[0055] The first lens includes an aspherical surface. For example, both surfaces of the first lens may be aspherical. The first lens may be made of a material having a high light transmittance and excellent workability. For example, the first lens may be made of a plastic material. The first lens has a low refractive index. For example, the refractive index of the first lens may be less than 1.6.

[0056] The second lens has refractive power. For example, the second lens may have negative refractive power. One surface of the second lens may be convex. For example, the second lens may have a convex object side surface.

[0057] The second lens includes an aspherical surface. For example, the object side surface of the second lens may be aspherical. The second lens may be made of a material having a high light transmittance and excellent processability. For example, the second lens may be made of a plastic material. The second lens has a refractive index higher than that of the first lens. For example, the refractive index of the second lens may be 1.6 or greater. In order to maximize the aberration correction effect of the first lens and the second lens, the difference between the refractive index of the first lens and the refractive index of the second lens may be ±0.1 or greater. For example, when the refractive index of the first lens is 1.55 or less, the refractive index of the second lens may be 1.65 or greater.

[0058] The third lens has a refractive power. One surface of the third lens may be convex. For example, the third lens may have a convex object side surface.

[0059] The third lens includes an aspherical surface. For example, the image side surface of the third lens may be aspherical. The third lens may be made of a material having a high light transmittance and excellent processability. For example, the third lens may be made of a plastic material. The third lens may have a refractive index approximately similar to that of the first lens. For example, the refractive index of the third lens may be less than 1.6. Additionally, in order to maximize the aberration correction effect of the second lens and the third lens, the difference between the refractive index of the second lens and the refractive index of the third lens may be ±0.1 or greater. For example, when the refractive index of the second lens is 1.65 or greater, the refractive index of the third lens may be 1.55 or less.

[0060] The fourth lens has a refractive power. For example, the fourth lens has a negative refractive power. One surface of the fourth lens may be convex. For example, the fourth lens may have a convex object side surface or a convex image side surface.

[0061] The fourth lens includes an aspherical surface. For example, both surfaces of the fourth lens may be aspherical. The fourth lens may be made of a material having a high light transmittance and excellent processability. For example, the fourth lens may be made of a plastic material. The fourth lens generally has the same or a similar refractive index as the second lens. For example, the refractive index of the fourth lens may be 1.6 or 1.65 or greater.

[0062] The fifth lens has a refractive power. One surface of the fifth lens may be convex. For example, the fifth lens may have a convex object side surface or a convex image side surface.

[0063] The fifth lens includes an aspherical surface. For example, both surfaces of the fifth lens may be aspherical. The fifth lens may be made of a material having a high light transmittance and excellent processability. For example, the fifth lens may be made of a plastic material. The fifth lens generally has the same or a similar refractive index as the fourth lens. For example, the refractive index of the fifth lens may be 1.6 or 1.65 or greater.

[0064] The sixth lens has a refractive power. For example, the sixth lens has a negative refractive power. One surface of the sixth lens may be convex. For example, the sixth lens may have a convex object side or a convex image side. The sixth lens may have a shape including an inflection point. For example, the inflection point may be formed on at least one of the object side and the image side of the sixth lens.

[0065] The sixth lens has an aspherical surface. For example, both surfaces of the sixth lens may be aspherical. The sixth lens may be made of a material having a high light transmittance and excellent processability. For example, the sixth lens may be made of a plastic material. The sixth lens generally has the same or a similar refractive index as the first lens. For example, the refractive index of the sixth lens may be less than 1.6.

[0066] The seventh lens has a refractive power. For example, the seventh lens has a positive refractive power. At least one surface of the seventh lens may be convex. For example, the seventh lens may have a shape in which both the object side and the image side are convex.

[0067] The seventh lens includes an aspherical surface. For example, both surfaces of the seventh lens may be aspherical. The seventh lens may be made of a material having a high light transmittance and excellent processability. For example, the seventh lens may be made of a plastic material. The seventh lens has a refractive index that is substantially similar to that of the fifth lens. For example, the refractive index of the seventh lens may be 1.6 or 1.65 or greater.

[0068] As described above, the first lens to the seventh lens include aspherical surfaces. The aspherical surfaces of the first lens to the seventh lens may be represented by Equation 1 below.

[0069] [Equation 1]

[0070]

[0071] In Equation 1, c is the reciprocal of the radius of curvature of the lens, k is the conic constant, r is the distance from any point on the aspherical surface to the optical axis, A to J are aspherical surface constants, and Z (or SAG) is the distance in the optical axis direction from any point on the aspherical surface to the vertex of the aspherical surface.

[0072] The imaging lens system further includes a filter, an image sensor, and a diaphragm.

[0073] The filter is disposed between the seventh lens and the image sensor. The filter may block light of certain wavelengths. For example, the filter may block light of infrared wavelengths. The image sensor forms an imaging surface. For example, the surface of the image sensor may form the imaging surface. The diaphragm is provided to adjust the amount of light incident on the lens. For example, the diaphragm may be disposed between the first lens and the second lens.

[0074] The imaging lens system can satisfy one or more of the following conditional expressions:

[0075] Conditional expression 1: TTL / f < 1.0

[0076] Conditional expression 2: D23 / D34 < 1.2

[0077] Conditional expression 3: 1.9 < TTL / (IMG_HT) < 2.2

[0078] Conditional expression 4: 0.15 < D56 / TTL

[0079] Conditional expression 5: D12 < D45

[0080] Conditional expression 6: 12 < D56 / D12

[0081] Conditional expression 7: -10 < f345 < -3.02

[0082] In conditional expressions 1 to 7, f is the focal length of the imaging lens system, TTL is the distance from the object side of the first lens to the imaging surface, D12 is the distance from the image side of the first lens to the object side of the second lens, D23 is the distance from the image side of the second lens to the object side of the third lens, D34 is the distance from the image side of the third lens to the object side of the fourth lens, D45 is the distance from the image side of the fourth lens to the object side of the fifth lens, D56 is the distance from the image side of the fifth lens to the object side of the sixth lens, IMG_HT is 1 / 2 of the diagonal length of the imaging surface, and f345 is the total focal length of the third lens to the fifth lens.

[0083] The imaging lens system can satisfy one or more of the following conditional expressions:

[0084] Conditional expression 8: 0.1 < L1w / L7w < 0.5

[0085] Conditional expression 9: 0.4 < L1TR / L7TR < 0.7

[0086] Conditional expression 10: 0.5 < L1234TRavg / L7TR < 0.75

[0087] Conditional expression 11: 0.5 < L12345TRavg / L7TR < 0.8

[0088] In conditional expressions 8 to 11, L1w is the weight [mg] of the first lens, L7w is the weight [mg] of the seventh lens, L1TR is the maximum diameter [mm] of the first lens, L7TR is the maximum diameter [mm] of the seventh lens, L1234TRavg is the average value of the maximum diameters of the first to fourth lenses [mm], and L12345TRavg is the average value of the maximum diameters of the first to fifth lenses [mm]. For reference, the maximum diameter of a lens refers to the diameter including the ribs of the lens.

[0089] Conditional expressions 8 and 9 provide the weight ratio and outer diameter ratio between the first lens and the seventh lens to facilitate self-alignment between the lenses and alignment through the lens barrel. Conditional expressions 10 and 11 provide the outer diameter ratio between the lenses to facilitate aberration correction.

[0090] For reference Figure 1 Describe the imaging lens system according to the first example.

[0091] The imaging lens system 100 includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, and a seventh lens 170.

[0092] The first lens 110 has a positive refractive power and has a convex object side and a convex image side. The second lens 120 has a negative refractive power and has a convex object side and a concave image side. The third lens 130 has a negative refractive power and has a convex object side and a concave image side. The fourth lens 140 has a negative refractive power and has a convex object side and a concave image side. The fifth lens 150 has a negative refractive power and has a convex object side and a concave image side. The sixth lens 160 has a negative refractive power and has a concave object side and a convex image side. The sixth lens 160 has a shape in which an inflection point is formed on at least one of the object side and the image side of the sixth lens 160. The seventh lens 170 has a positive refractive power and has a convex object side and a convex image side.

[0093] The imaging lens system 100 further includes a filter 180 and an image sensor 190. The filter 180 is disposed between the seventh lens 170 and the image sensor 190. As shown in Table 1 below, a diaphragm may be disposed between the fourth lens 140 and the fifth lens 150.

[0094] The imaging lens system 100 can exhibit aberration characteristics as shown in Figure 2 (in Figure 2 , Figure 5 , Figure 8 , Figure 11 and Figure 14in which the longitudinal spherical aberration, astigmatism field curvature, and distortion of the corresponding imaging lens system are shown in order from left to right). As Figure 3 As shown in Figure 3 , the imaging lens system 100 may be coupled to the lens barrel 102. In the imaging lens system 100, the optical axes of the first lens 110 to the fourth lens 140 are aligned by being interconnected. For example, the edges of the second lens 120 to the fourth lens 140 generally do not contact the inner circumferential surface of the lens barrel 102. In the imaging lens system 100, the fifth lens 150 to the seventh lens 170 are coupled to the lens barrel 102 such that the optical axes are aligned. That is, the fifth lens 150 to the seventh lens 170 contact the inner circumferential surface of the lens barrel 102. A light blocking member is disposed between the lenses. Gap holding members SP1 and SP2 are disposed between the fifth lens 150 and the sixth lens 160 and between the sixth lens 160 and the seventh lens 170.

[0095] Tables 1 and 2 show the lens characteristics and aspherical values of the imaging lens system 100.

[0096] [Table 1]

[0097]

[0098] [Table 2]

[0099]

[0100] Reference will be made to Figure 4 describe the imaging lens system according to the second example.

[0101] The imaging lens system 200 includes a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, a sixth lens 260, and a seventh lens 270.

[0102] The first lens 210 has a positive refractive power and has a convex object side and a convex image side. The second lens 220 has a negative refractive power and has a convex object side and a concave image side. The third lens 230 has a negative refractive power and has a convex object side and a concave image side. The fourth lens 240 has a negative refractive power and has a concave object side and a convex image side. The fifth lens 250 has a negative refractive power and has a concave object side and a convex image side. The sixth lens 260 has a negative refractive power and has a concave object side and a convex image side. The sixth lens 260 has a shape in which an inflection point is formed on at least one of the object side and the image side of the sixth lens 260. The seventh lens 270 has a positive refractive power and has a convex object side and a convex image side.

[0103] The imaging lens system 200 further includes a filter 280 and an image sensor 290. The filter 280 is disposed between the seventh lens 270 and the image sensor 290. As shown in Table 3 below, the aperture stop may be disposed between the third lens 230 and the fourth lens 240.

[0104] The imaging lens system 200 may exhibit aberration characteristics as Figure 5 shown. As Figure 6 shown, the imaging lens system 200 may be coupled to a lens barrel 202. In the imaging lens system 200, the optical axes of the first lens 210 to the fourth lens 240 are aligned by being interconnected. For example, the edges of the second lens 220 to the fourth lens 240 generally do not contact the inner peripheral surface of the lens barrel 202. In the imaging lens system 200, the fifth lens 250 to the seventh lens 270 are coupled to the lens barrel 202 such that the optical axes of the fifth lens 250 to the seventh lens 270 are aligned. That is, the fifth lens 250 to the seventh lens 270 contact the inner peripheral surface of the lens barrel 202. A light blocking member is disposed between the lenses. Gap maintaining members SP1 and SP2 are disposed between the fifth lens 250 and the sixth lens 260 and between the sixth lens 260 and the seventh lens 270.

[0105] Table 3 and Table 4 show the lens characteristics and aspherical values of the imaging lens system 200.

[0106] [Table 3]

[0107]

[0108] [Table 4]

[0109]

[0110]

[0111] Reference will be made to Figure 7 describe the imaging lens system according to the third example.

[0112] The imaging lens system 300 includes a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, a sixth lens 360, and a seventh lens 370.

[0113] The first lens 310 has a positive refractive power and has a convex object side and a convex image side. The second lens 320 has a negative refractive power and has a convex object side and a concave image side. The third lens 330 has a negative refractive power and has a convex object side and a concave image side. The fourth lens 340 has a negative refractive power and has a concave object side and a convex image side. The fifth lens 350 has a positive refractive power and has a concave object side and a convex image side. The sixth lens 360 has a negative refractive power and has a concave object side and a convex image side. The sixth lens 360 has a shape in which an inflection point is formed on at least one of the object side and the image side of the sixth lens 360. The seventh lens 370 has a positive refractive power and has a convex object side and a convex image side.

[0114] The imaging lens system 300 further includes a filter 380 and an image sensor 390. The filter 380 is disposed between the seventh lens 370 and the image sensor 390. As shown in Table 5 below, the aperture stop may be disposed between the second lens 320 and the third lens 330.

[0115] The imaging lens system 300 may exhibit aberration characteristics as Figure 8 shown. As Figure 9 shown, the imaging lens system 300 may be coupled to a lens barrel 302. In the imaging lens system 300, the optical axes of the first lens 310 to the third lens 330 are aligned by being coupled to each other. For example, the edges of the second lens 320 and the third lens 330 are substantially not in contact with the inner peripheral surface of the lens barrel 302. In the imaging lens system 300, the fourth lens 340 to the seventh lens 370 are coupled to the lens barrel 302 such that the optical axes of the fourth lens 340 to the seventh lens 370 are aligned. That is, the fourth lens 340 to the seventh lens 370 are in contact with the inner peripheral surface of the lens barrel 302. A light blocking member is disposed between the lenses. Gap maintaining members SP1 and SP2 are disposed between the fifth lens 350 and the sixth lens 360 and between the sixth lens 360 and the seventh lens 370.

[0116] Tables 5 and 6 show the lens characteristics and aspherical values of the imaging lens system 300.

[0117] [Table 5]

[0118]

[0119] [Table 6]

[0120]

[0121] Reference will be made to Figure 10 describe the imaging lens system according to the fourth example.

[0122] The imaging lens system 400 includes a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, a sixth lens 460, and a seventh lens 470.

[0123] The first lens 410 has a positive refractive power and has a convex object side and a convex image side. The second lens 420 has a negative refractive power and has a convex object side and a concave image side. The third lens 430 has a negative refractive power and has a convex object side and a concave image side. The fourth lens 440 has a negative refractive power and has a concave object side and a convex image side. The fifth lens 450 has a negative refractive power and has a concave object side and a convex image side. The sixth lens 460 has a negative refractive power and has a convex object side and a concave image side. The sixth lens 460 has a shape in which an inflection point is formed on at least one of the object side and the image side of the sixth lens 460. The seventh lens 470 has a positive refractive power and has a convex object side and a convex image side.

[0124] The imaging lens system 400 further includes a filter 480 and an image sensor 490. The filter 480 is disposed between the seventh lens 470 and the image sensor 490. As shown in Table 7 below, a diaphragm may be disposed between the second lens 420 and the third lens 430.

[0125] The imaging lens system 400 may exhibit aberration characteristics as Figure 11 shown. As Figure 12 shown, the imaging lens system 400 may be coupled to a lens barrel 402. In the imaging lens system 400, the optical axes of the first lens 410 to the third lens 430 are aligned by being interconnected. For example, the edges of the second lens 420 and the third lens 430 do not substantially contact the inner peripheral surface of the lens barrel 402. In the imaging lens system 400, the fourth lens 440 to the seventh lens 470 are coupled to the lens barrel 402 such that the optical axes of the fourth lens 440 to the seventh lens 470 are aligned. That is, the fourth lens 440 to the seventh lens 470 contact the inner peripheral surface of the lens barrel 402. A light blocking member is disposed between the lenses. Gap maintaining members SP1 and SP2 are disposed between the fifth lens 450 and the sixth lens 460 and between the sixth lens 460 and the seventh lens 470.

[0126] Table 7 and Table 8 show the lens characteristics and aspherical values of the imaging lens system 400.

[0127] [Table 7]

[0128]

[0129]

[0130] [Table 8]

[0131]

[0132] Reference will be made to Figure 13 describe an imaging lens system according to the fifth example.

[0133] The imaging lens system 500 includes a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, a sixth lens 560, and a seventh lens 570.

[0134] The first lens 510 has a positive refractive power and has a convex object side and a concave image side. The second lens 520 has a negative refractive power and has a convex object side and a concave image side. The third lens 530 has a positive refractive power and has a convex object side and a concave image side. The fourth lens 540 has a negative refractive power and has a concave object side and a convex image side. The fifth lens 550 has a negative refractive power and has a concave object side and a convex image side. The sixth lens 560 has a negative refractive power, has a convex object side and a concave image side. The sixth lens 560 has a shape in which an inflection point is formed on at least one of the object side and the image side of the sixth lens 560. The seventh lens 570 has a positive refractive power and has a convex object side and a convex image side.

[0135] The imaging lens system 500 further includes a filter 580 and an image sensor 590. The filter 580 is disposed between the seventh lens 570 and the image sensor 590. As shown in Table 9 below, a diaphragm may be disposed between the second lens 520 and the third lens 530.

[0136] The imaging lens system 500 may exhibit aberration characteristics as Figure 14 shown. As Figure 15 shown, the imaging lens system 500 may be coupled to a lens barrel 502. In the imaging lens system 500, the optical axes of the first lens 510 to the third lens 530 are aligned by being interconnected. For example, the edges of the second lens 520 and the third lens 530 are substantially not in contact with the inner peripheral surface of the lens barrel 502. In the imaging lens system 500, the fourth lens 540 to the seventh lens 570 are coupled to the lens barrel 502 such that the optical axes of the fourth lens 540 to the seventh lens 570 are aligned. That is, the fourth lens 540 to the seventh lens 570 are in contact with the inner peripheral surface of the lens barrel 502. A light blocking member is disposed between the lenses. Gap holding members SP1 and SP2 are disposed between the fifth lens 550 and the sixth lens 560 and between the sixth lens 560 and the seventh lens 570.

[0137] Tables 9 and 10 show the lens characteristics and aspherical values of the imaging lens system according to the present embodiment.

[0138] [Table 9]

[0139]

[0140] [Table 10]

[0141]

[0142]

[0143] Tables 11 and 12 show the optical characteristic values of the imaging lens system according to the first to fifth examples. In Table 11, SL is the distance from the aperture to the imaging surface in mm, CRA is the chief ray angle, F No. is the f-number, and FOV is the field of view angle in degrees.

[0144] [Table 11]

[0145] Reference First Example Second Example Third Example Fourth Example Fifth Example f 7.00 6.70 6.20 6.20 6.20 TTL 5.75 5.75 5.75 5.75 5.75 SL 3.60 3.87 4.33 4.36 4.40 CRA 24.90 23.07 23.27 26.91 25.10 F No. 2.86 2.67 2.48 2.48 2.48 Diagonal Length of Imaging Plane 5.53 5.45 5.45 5.45 5.45 FOV 43.40 44.90 47.35 47.41 47.40

[0146] [Table 12]

[0147]

[0148]

[0149] In Table 12, L1w to L7w represent the weights [mg] of the first to seventh lenses, and L1TR to L7TR represent the maximum diameters [mm] of the first to seventh lenses including ribs.

[0150] Tables 13 and 14 show the conditional expression values of the imaging lens system according to the first to fifth examples.

[0151] [Table 13]

[0152] Conditional Expression First Example Second Example Third Example Fourth Example Fifth Example TTL / f 0.8214 0.8582 0.9274 0.9274 0.9274 D23 / D34 0.6248 0.5857 0.7426 1.1116 0.7995 TTL / IMG_HT 2.0794 2.1101 2.1101 2.1100 2.1101 D56 / TTL 0.2449 0.2321 0.2304 0.2037 0.1600 D56 / D12 56.3297 53.3805 22.1064 45.4025 26.1065 f345 -3.8169 -4.6620 -6.2696 -7.5474 -8.8909

[0153] [Table 14]

[0154]

[0155] The imaging lens system according to the example may generally have the following optical characteristics. For example, the total length TTL of the imaging lens system may be in the range of 5.5 mm to 6.0 mm, the focal length of the imaging lens system may be in the range of 6.0 mm to 7.2 mm, the focal length of the first lens may be in the range of 2.3 mm to 3.2 mm, the focal length of the second lens may be in the range of -9.0 mm to -4.0 mm, the focal length of the third lens may be in the range of -10 mm or less or 100 mm or more, the focal length of the fourth lens may be in the range of -20 mm to -6.0 mm, the focal length of the fifth lens may be in the range of -7 mm or less or 15 mm or more, the focal length of the sixth lens may be in the range of -10 mm to -2.0 mm, and the focal length of the seventh lens may be in the range of 5.0 mm to 30 mm.

[0156] As described above, according to the example, the performance of the camera module can be improved.

[0157] Although the present disclosure includes specific examples, it will be apparent to those of ordinary skill in the art that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described in this application should be considered only in a descriptive sense and not for purposes of limitation. The description of the features or aspects in each example should be considered applicable to similar features or aspects in other examples. Suitable results can also be obtained if the described techniques are performed in a different order, and / or if the components in the described systems, architectures, devices, or circuits are combined in a different way and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of the present disclosure should not be limited by the specific embodiments, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in the present disclosure.

Claims

1. An imaging lens system, wherein, The imaging lens system includes: A first lens, including a positive refractive power and a convex object side surface; A second lens, including a negative refractive power and a convex object side surface; A third lens, including a refractive power; A fourth lens, including a negative refractive power; A fifth lens, including a refractive power; A sixth lens, including a negative refractive power; and A seventh lens, including a positive refractive power, wherein, the first lens to the seventh lens are arranged in sequence from the object side towards the imaging surface, wherein, the number of lenses with refractive power in the imaging lens system is 7, wherein, the refractive powers of the third lens and the fifth lens are one of negative-negative, negative-positive, and positive-negative, and wherein, 0.1 < L1w / L7w < 0.5, where L1w is the weight of the first lens and L7w is the weight of the seventh lens.

2. The imaging lens system according to claim 1, wherein, The first lens has a convex image side surface.

3. The imaging lens system according to claim 1, wherein, The second lens has a concave image side surface.

4. The imaging lens system according to claim 1, wherein, The third lens has a concave image side surface.

5. The imaging lens system according to claim 1, wherein, The fourth lens has a concave object side surface.

6. The imaging lens system according to claim 1, wherein, The fifth lens has a concave object side surface.

7. The imaging lens system according to claim 1, wherein, The sixth lens has a concave object side surface.

8. An imaging lens system, wherein, The imaging lens system includes: A first lens, including a positive refractive power and a convex object side surface; A second lens, including a negative refractive power and a convex object side surface; A third lens, including a refractive power; A fourth lens, including a negative refractive power; A fifth lens, including a refractive power; A sixth lens, including a negative refractive power; and A seventh lens, including a positive refractive power, wherein, the first lens to the seventh lens are arranged in sequence from the object side towards the imaging surface, wherein, the number of lenses with refractive power in the imaging lens system is 7, wherein, the refractive powers of the third lens and the fifth lens are one of negative-negative, negative-positive, and positive-negative, and wherein, TTL is in the range of 5.5 mm to 6.0 mm and f2 is in the range of -9.0 mm to -4.0 mm, where TTL is the distance from the object side surface of the first lens to the imaging surface, and f2 is the focal length of the second lens.

9. The imaging lens system according to claim 8, wherein, The first lens has a convex image side surface.

10. The imaging lens system according to claim 8, wherein, The second lens has a concave image side surface.

11. The imaging lens system according to claim 8, wherein, The third lens has a concave image side surface.

12. The imaging lens system according to claim 8, wherein, The fourth lens has a concave object side surface.

13. The imaging lens system according to claim 8, wherein, The fifth lens has a concave object side surface.

14. The imaging lens system according to claim 8, wherein, The sixth lens has a concave object side surface.

Images