Imaging lens system

Abstract

The imaging lens system includes: a first lens with positive refractive power; a second lens with negative refractive power; a third lens with refractive power; a fourth lens with negative refractive power; a fifth lens with refractive power; a sixth lens with negative refractive power and a convex image-side surface; and a seventh lens with positive refractive power. The first to seventh lenses are arranged sequentially from the object side towards the imaging plane. The imaging lens system has a total of seven lenses with refractive power. Furthermore, TTL / f < 1.0 and D23 / D34 < 1.2, where TTL is the distance from the object side of the first lens to the imaging plane, f is the focal length of the imaging lens system, D23 is the distance from the image-side of the second lens to the object side of the third lens, and D34 is the distance from the image-side of the third lens to the object side of the fourth lens.

Description

[0001] Cross-references 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 pertains to an imaging lens system with seven lenses. Background Technology

[0004] Compact cameras are typically mounted on wireless terminals. For example, a compact camera can be mounted on the front and rear surfaces of such a wireless terminal. Because these camera modules are used for various purposes, such as outdoor landscape photography and indoor portrait photography, the performance of the compact camera must be no less than that of a conventional camera. However, due to the size limitations of the wireless terminal, achieving a high level of performance is difficult. Therefore, there is a need to develop imaging lens systems that can improve the performance of compact cameras without increasing their size. 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] Imaging lens systems can improve the performance of compact cameras.

[0007] In general, 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 arranged sequentially 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 of the first lens to the image plane, f is the focal length of the imaging lens system, D23 is the distance from the image side of the second lens to the object side of the third lens, and D34 is the distance from the image side of the third lens to the object side 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, third, fourth, fifth, and sixth lenses 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 surface.

[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 arranged in sequence 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 surface.

[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. [[ID=三十]]

[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 the imaging lens system based on the first example.

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

[0025] Figure 3 It is shown Figure 1 The diagram shows the connection status of the imaging lens system and the lens barrel.

[0026] Figure 4 It is a configuration diagram of the imaging lens system based on the second example.

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

[0028] Figure 6 It is shown Figure 4 The diagram shows the connection status of the imaging lens system and the lens barrel.

[0029] Figure 7 It is a configuration diagram of the imaging lens system based on the third example.

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

[0031] Figure 9 It is shown Figure 7 The diagram shows the connection status of the imaging lens system and the lens barrel.

[0032] Figure 10 It is a configuration diagram of the imaging lens system based on the fourth example.

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

[0034] Figure 12 It is shown Figure 10 The diagram shows the connection status of the imaging lens system and the lens barrel.

[0035] Figure 13 It is a configuration diagram of the imaging lens system based on the fifth example.

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

[0037] Figure 15 It is shown Figure 13The diagram shows the connection status of the imaging lens system and the lens barrel.

[0038] Throughout the accompanying drawings and detailed embodiments, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative dimensions, scale, and depiction of elements in the drawings may be exaggerated. Detailed Implementation

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

[0040] The features described in this application may be implemented in various forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art.

[0041] It should be noted that in this application, the use of the word "may" with respect to examples or implementations, for example, with respect to what an example or implementation may include or implement, means that there exists at least one example or implementation that includes or implements such features, and that all examples and implementations are not limited thereto.

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

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

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

[0045] Spatial relative terms such as “above,” “above,” “below,” and “below” may be used in this application for descriptive convenience to describe the relationship of one element relative to another, as shown in the accompanying drawings. In addition to covering the orientation depicted in the drawings, these spatial relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as “above” or “above” another element would be “below” or “below” that other element. Thus, depending on the spatial orientation of the device, the term “above” covers both “above” and “below” orientations. 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 terminology used in this application is for describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the articles “a,” “an,” and “the” are intended to include the plural form as well. The terms “comprising,” “including,” and “having” describe the presence of the stated features, numbers, operations, components, elements, and / or combinations thereof, but do not exclude 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 accompanying drawings may occur. Therefore, the examples described in this application are not limited to the specific shapes shown in the accompanying drawings, but include shape variations that may occur during manufacturing.

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

[0049] The following description will refer to the accompanying drawings.

[0050] However, this disclosure may be exemplified in many different forms and should not be construed as being 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 target), and the seventh lens refers to the lens closest to the imaging surface (or image sensor). In this application, the radius of curvature, lens thickness, TTL (distance from the object side of the first lens to the imaging surface), IMG_HT (half the diagonal length of the imaging surface), and focal length of the lens can be expressed in millimeters (mm).

[0052] The lens thickness, the spacing between lenses, and the TTL (Time to Light) are the distances along the optical axis of the lenses. Furthermore, when explaining the shape of each lens, a convex shape on one face can indicate that the paraxial region of that face is convex, while a concave shape on one face can indicate that the paraxial region of that face is concave. Therefore, even when one face of a lens is described as having a convex shape, the edge portion of the lens can be concave. Similarly, even when one face of a lens is described as having a concave shape, the edge portion of the lens can be convex.

[0053] The imaging lens system comprises 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 arranged sequentially from the object side. The first to seventh lenses may be arranged at predetermined intervals. For example, each lens does not contact the image-side and object-side surfaces of adjacent lenses in the paraxial region. Therefore, in the accompanying drawings, although it is shown that the image-side surface of a lens on one side and the object-side surface of a lens on the other side are in contact, the image-side and object-side surfaces between two lenses are not actually in 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 with high light transmittance and excellent processability. 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 with high light transmittance and excellent machinability. For example, the second lens may be made of a plastic material. The second lens has a higher refractive index than the first lens. For example, the refractive index of the second lens may be 1.6 or greater. To maximize the aberration improvement effect of the first and second lenses, the difference between the refractive indices of the first and second lenses 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 refractive power. One surface of the third lens can be convex. For example, the third lens can have a convex object-side surface.

[0059] The third lens includes an aspherical surface. For example, the image-side surface of the third lens can be aspherical. The third lens can be made of a material with high light transmittance and excellent processability. For example, the third lens can be made of plastic. The third lens can have a refractive index approximately similar to that of the first lens. For example, the refractive index of the third lens can be less than 1.6. Furthermore, to maximize the aberration improvement effect of the second and third lenses, the difference between the refractive indices of the second and third lenses can 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 can be 1.55 or less.

[0060] The fourth lens has refractive power. For example, the fourth lens has 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 can be aspherical. The fourth lens can be made of a material with high light transmittance and excellent machinability. For example, the fourth lens can be made of plastic. The fourth lens has approximately the same or similar refractive index as the second lens. For example, the refractive index of the fourth lens can be 1.6 or 1.65 or greater.

[0062] The fifth lens has refractive power. One surface of the fifth lens can be convex. For example, the fifth lens can 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 with high light transmittance and excellent machinability. For example, the fifth lens may be made of plastic. The fifth lens has approximately the same or 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 refractive power. For example, the sixth lens has negative refractive power. One surface of the sixth lens may be convex. For example, the sixth lens may have a convex object-side surface or a convex image-side surface. The sixth lens may have a shape including a recurve point. For example, the recurve point may be formed on at least one of the object-side surface and the image-side surface 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 with high light transmittance and excellent machinability. For example, the sixth lens may be made of plastic. The sixth lens has approximately the same or 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 refractive power. For example, the seventh lens has 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 surface and the image-side surface 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 with high light transmittance and excellent machinability. For example, the seventh lens may be made of plastic. The seventh lens has a refractive index that is approximately 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 to seventh lenses include aspherical surfaces. The aspherical surfaces of the first to seventh lenses can 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 from any point on the aspherical surface to the vertex of the aspherical surface in the direction of the optical axis.

[0072] The imaging lens system also includes filters, image sensors, and apertures.

[0073] A filter is positioned between the seventh lens and the image sensor. The filter blocks certain wavelengths of light. For example, it blocks infrared wavelengths. The image sensor forms an imaging surface. For example, the surface of the image sensor can form an imaging surface. An aperture is provided to adjust the amount of light incident on the lens. For example, the aperture can be positioned between the first and second lenses.

[0074] An 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 image plane, 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 half the diagonal length of the image plane, and f345 is the total focal length from the third lens to the fifth lens.

[0083] An 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 of the first lens [mg], L7w is the weight of the seventh lens [mg], L1TR is the maximum diameter of the first lens [mm], L7TR is the maximum diameter of the seventh lens [mm], L1234TRavg is the average of the maximum diameters of the first to fourth lenses [mm], and L12345TRavg is the average 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 and seventh lenses 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] Reference Figure 1 The imaging lens system according to the first example is described.

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

[0093] The imaging lens system 100 also 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, an aperture stop may be disposed between the fourth lens 140 and the fifth lens 150.

[0094] Imaging lens system 100 can exhibit the following characteristics: Figure 2 The aberration characteristics shown (in) Figure 2 , Figure 5 , Figure 8 , Figure 11 and Figure 14In the image, from left to right, the longitudinal spherical aberration, astigmatism, and distortion of the corresponding imaging lens system are shown. Figure 3 As shown, the imaging lens system 100 can 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 interconnection. For example, the edges of the second lens 120 to the fourth lens 140 generally do not contact the inner peripheral 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 their optical axes are aligned. That is, the fifth lens 150 to the seventh lens 170 contact the inner peripheral surface of the lens barrel 102. Light blocking members are disposed between the lenses. Gap maintaining 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]

[0099] [Table 2]

[0100]

[0101] Reference Figure 4 The imaging lens system according to the second example is described.

[0102] 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.

[0103] The first lens 210 has positive refractive power and a convex object-side surface and a convex image-side surface. The second lens 220 has negative refractive power and a convex object-side surface and a concave image-side surface. The third lens 230 has negative refractive power and a convex object-side surface and a concave image-side surface. The fourth lens 240 has negative refractive power and a concave 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 convex image-side surface. The sixth lens 260 has negative refractive power and a concave object-side surface and a convex image-side surface. The sixth lens 260 has a shape in which a recurve point is formed on at least one of the object-side surface and the image-side surface. The seventh lens 270 has positive refractive power and a convex object-side surface and a convex image-side surface.

[0104] The imaging lens system 200 also 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.

[0105] Imaging lens system 200 can exhibit the following characteristics: Figure 5 The aberration characteristics are shown in the figure. Figure 6 As shown, the imaging lens system 200 can be coupled to the 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 interconnection. For example, the edges of the second lens 220 to the fourth lens 240 do not substantially 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. Light blocking members are 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.

[0106] Tables 3 and 4 show the lens characteristics and aspherical values ​​of the imaging lens system 200.

[0107] [Table 3]

[0108]

[0109] [Table 4]

[0110]

[0111]

[0112] Reference Figure 7 Describe the imaging lens system according to the third example.

[0113] 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.

[0114] The first lens 310 has positive refractive power and a convex object-side surface and a convex image-side surface. The second lens 320 has negative refractive power and a convex object-side surface and a concave image-side surface. The third lens 330 has negative refractive power and a convex object-side surface and a concave image-side surface. The fourth lens 340 has negative refractive power and a concave object-side surface and a convex image-side surface. The fifth lens 350 has positive refractive power and a concave object-side surface and a convex image-side surface. The sixth lens 360 has negative refractive power and a concave object-side surface and a convex image-side surface. The sixth lens 360 has a shape in which a recurve point is formed on at least one of the object-side surface and the image-side surface of the sixth lens 360. The seventh lens 370 has positive refractive power and a convex object-side surface and a convex image-side surface.

[0115] The imaging lens system 300 also 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, an aperture stop may be disposed between the second lens 320 and the third lens 330.

[0116] Imaging lens system 300 can exhibit the following characteristics: Figure 8 The aberration characteristics are shown in the figure. Figure 9 As shown, the imaging lens system 300 can be coupled to the 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 interconnection. For example, the edges of the second lens 320 and the third lens 330 do not substantially contact 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 contact the inner peripheral surface of the lens barrel 302. Light blocking members are 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.

[0117] Tables 5 and 6 show the lens characteristics and aspherical values ​​of the imaging lens system 300.

[0118] [Table 5]

[0119]

[0120]

[0121] [Table 6]

[0122]

[0123] Reference Figure 10Describe the imaging lens system according to the fourth example.

[0124] 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.

[0125] The first lens 410 has positive refractive power and a convex object-side surface and a convex image-side surface. The second lens 420 has negative refractive power and a convex object-side surface and a concave image-side surface. The third lens 430 has negative refractive power and a convex object-side surface and a concave image-side surface. The fourth lens 440 has negative refractive power and a concave object-side surface and a convex image-side surface. The fifth lens 450 has negative refractive power and a concave object-side surface and a convex image-side surface. The sixth lens 460 has negative refractive power and a convex object-side surface and a concave image-side surface. The sixth lens 460 has a shape in which a recurve point is formed on at least one of the object-side surface and the image-side surface of the sixth lens 460. The seventh lens 470 has positive refractive power and a convex object-side surface and a convex image-side surface.

[0126] The imaging lens system 400 also 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, an aperture stop may be disposed between the second lens 420 and the third lens 430.

[0127] Imaging lens system 400 can exhibit the following characteristics: Figure 11 The aberration characteristics are shown in the figure. Figure 12 As shown, the imaging lens system 400 can be coupled to the 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 interconnection. 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. Light blocking members are 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.

[0128] Tables 7 and 8 show the lens characteristics and aspherical values ​​of the imaging lens system 400.

[0129] [Table 7]

[0130]

[0131] [Table 8]

[0132]

[0133]

[0134] Reference Figure 13 Describe the imaging lens system according to the fifth example.

[0135] 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.

[0136] The first lens 510 has positive refractive power and a convex object-side surface and a concave image-side surface. The second lens 520 has negative refractive power and a convex object-side surface and a concave image-side surface. The third lens 530 has positive refractive power and a convex object-side surface and a concave image-side surface. The fourth lens 540 has negative refractive power and a concave object-side surface and a convex image-side surface. The fifth lens 550 has negative refractive power and a concave object-side surface and a convex image-side surface. The sixth lens 560 has negative refractive power and a convex object-side surface and a concave image-side surface. The sixth lens 560 has a shape in which a curvature point is formed on at least one of the object-side surface and the image-side surface of the sixth lens 560. The seventh lens 570 has positive refractive power and a convex object-side surface and a convex image-side surface.

[0137] The imaging lens system 500 also 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, an aperture stop may be disposed between the second lens 520 and the third lens 530.

[0138] The imaging lens system 500 can exhibit the following characteristics: Figure 14 The aberration characteristics are shown in the figure. Figure 15 As shown, the imaging lens system 500 can be coupled to the 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 interconnection. For example, the edges of the second lens 520 and the third lens 530 do not substantially contact 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 contact the inner peripheral surface of the lens barrel 502. Light blocking members are disposed between the lenses. Gap maintaining 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.

[0139] Tables 9 and 10 show the lens characteristics and aspherical values ​​of the imaging lens system according to this embodiment.

[0140] [Table 9]

[0141]

[0142] [Table 10]

[0143]

[0144] Tables 11 and 12 show the optical characteristic values ​​of the imaging lens systems according to the first to fifth examples. In Table 11, SL is the distance from the aperture stop to the imaging plane in mm, CRA is the principal ray angle, F No. is the aperture number, and FOV is the field of view in degrees.

[0145] [Table 11]

[0146]

[0147]

[0148] [Table 12]

[0149]

[0150] In Table 12, L1w to L7w represent the weight [mg] of the first to seventh lenses, and L1TR to L7TR represent the maximum diameter [mm] of the first to seventh lenses including the ribs.

[0151] Tables 13 and 14 show the conditional expression values ​​for the imaging lens systems according to the first to fifth examples.

[0152] [Table 13]

[0153]

[0154] [Table 14]

[0155]

[0156] The imaging lens system described in 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.

[0157] As illustrated above, the performance of the camera module can be improved based on the example.

[0158] While this disclosure includes specific examples, it will be apparent to those skilled 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 herein should be considered descriptive only and not for limiting purposes. Descriptions of features or aspects in each example should be considered applicable to similar features or aspects in other examples. Suitable results may also be obtained if the described techniques are performed in a different order, and / or if components in the described system, architecture, device, or circuit are combined in different ways and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of this disclosure 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 this disclosure.

Claims

1. An imaging lens system, comprising: The first lens has positive refractive power; The second lens has negative refractive power; The third lens has refractive power; The fourth lens has negative refractive power; The fifth lens has refractive power; The sixth lens has negative refractive power and a convex image-side surface; as well as The seventh lens has positive refractive power. The first lens to the seventh lens are arranged sequentially from the object side toward the imaging plane. The imaging lens system has a total of seven lenses with refractive power. Where 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. Wherein, 22.1064 ≤ D56 / D12 ≤ 56.3297, where D56 is the distance from the image side of the fifth lens to the object side of the sixth lens, and D12 is the distance from the image side of the first lens to the object side of the second lens.

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

3. The imaging lens system according to claim 1, wherein, The second lens has a convex object-side surface.

4. The imaging lens system according to claim 1, wherein, The third lens has a convex object-side surface.

5. The imaging lens system according to claim 1, wherein, The sixth lens has a concave image-side surface.

6. The imaging lens system according to claim 1, wherein, The seventh lens has a convex object-side surface.

7. The imaging lens system according to claim 1, wherein, 1.9 < TTL / (IMG_HT) < 2.2, where IMG_HT is half the diagonal length of the imaging plane.

8. An imaging lens system, comprising: The first lens has positive refractive power; The second lens has negative refractive power; The third lens has refractive power; The fourth lens has negative refractive power; The fifth lens has refractive power; The sixth lens has negative refractive power and a convex image-side surface; as well as The seventh lens has positive refractive power. The first lens to the seventh lens are arranged sequentially from the object side toward the imaging plane. The imaging lens system has a total of seven lenses with refractive power. Wherein, 0.15 < D56 / TTL, where D56 is the distance from the image-side surface of the fifth lens to the object-side surface of the sixth lens, and TTL is the distance from the object-side surface of the first lens to the imaging plane. Among them, TTL is in the range of 5.5mm to 6.0mm, and Wherein, 22.1064 ≤ D56 / D12 ≤ 56.3297, and D12 is the distance from the image side of the first lens to the object side of the second lens.

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

10. The imaging lens system according to claim 8, wherein, The second lens has a convex object-side surface.

11. The imaging lens system according to claim 8, wherein, The third lens has positive refractive power.

12. The imaging lens system according to claim 8, wherein, The fourth lens has a convex 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 fifth lens has a convex image-side surface.

15. The imaging lens system according to claim 8, wherein, The sixth lens has a convex object-side surface.

16. The imaging lens system according to claim 8, wherein, The seventh lens has a convex object-side surface.

Images