Imaging lens system and camera module

Abstract

The present disclosure relates to an imaging lens system including, disposed in order from an object side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The field of view (FOV) of the imaging lens system according to an embodiment is wider than 85 degrees and narrower than 160 degrees. In the imaging lens system according to an embodiment, a distance (TTL) from an object side surface of the first lens to an imaging surface is greater than 6.0 mm and less than 9.0 mm. The present disclosure also relates to a camera module including the imaging lens system.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2021-0114397, filed with the Korean Intellectual Property Office on August 30, 2021, the entire disclosure of which is incorporated herein by reference for all purposes. Technical Field

[0003] This disclosure relates to an imaging lens system capable of adjusting the focal magnification. Background Technology

[0004] Portable electronic devices may include camera modules for taking photos or recording videos. For example, camera modules can be installed in mobile phones, laptops, game consoles, etc. Portable electronic devices are typically manufactured to be thin or small to increase portability. Therefore, camera modules installed in portable electronic devices can be configured with a limited number of imaging lens systems. For example, a camera module may include an imaging lens system with a fixed focal length. However, imaging lens systems with a fixed focal length may struggle to achieve high optical performance.

[0005] The above information is presented as background information only to aid in understanding this disclosure. No determination or assertion is made as to whether any of the above content can be used as prior art with respect to this disclosure. Summary of the Invention

[0006] 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.

[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 arranged sequentially from the object side, wherein the field of view (FOV) of the imaging lens system is wider than 85 degrees and narrower than 160 degrees, and wherein the distance (TTL) from the object side of the first lens to the imaging plane is greater than 6.0 mm and less than 9.0 mm.

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

[0009] The fourth lens can have positive refractive power.

[0010] The fourth lens may have a convex object-side surface.

[0011] The fifth lens may have a convex object-side surface.

[0012] The sixth lens may have a concave object side surface.

[0013] The following conditional expression may be satisfied: 25 < FOVw / fw < 60, where FOVw is the field of view in the wide-angle mode of the imaging lens system, and fw is the focal length in the wide-angle mode of the imaging lens system.

[0014] The following conditional expression may be satisfied: 15 < FOVw / TTLw < 25, where TTLw is the distance from the object side surface of the first lens to the imaging surface in the wide-angle mode of the imaging lens system.

[0015] The following conditional expression may be satisfied: 2.0 < D12 / D45 < 17, where D12 is the distance from the image side surface of the first lens to the object side surface of the second lens, and D45 is the distance from the image side surface of the fourth lens to the object side surface of the fifth lens.

[0016] The following conditional expression may be satisfied: 1.0 < TTLw / TTLt < 1.1, where TTLt is the distance from the object side surface of the first lens to the imaging surface in the telephoto mode of the imaging lens system.

[0017] The camera module may include an imaging lens system and an image sensor having an imaging surface disposed at a position where light incident through the first lens to the seventh lens forms an image.

[0018] In another general aspect, the imaging lens system includes: a first lens having a negative refractive power and a convex object side surface; a second lens having a negative refractive power; a third lens having a refractive power; a fourth lens having a refractive power and a concave object side surface; a fifth lens having a refractive power; a sixth lens having a refractive power and a concave object side surface; and a seventh lens having a negative refractive power, wherein the first lens to the seventh lens are sequentially arranged from the object side with an air gap.

[0019] The third lens may have a convex image side surface.

[0020] The fifth lens may have a concave image side surface.

[0021] The sixth lens may have a convex image side surface.

[0022] The seventh lens may have a shape in which an inflection point is formed on at least one of its object side surface and image side surface.

[0023] It can satisfy at least one of the following conditional expressions: -0.1 < IMG HT / fG3 < 0.2; 0.6 < R1 / IMG HT < 0.9; and 1.2 < VG2 / VG3 < 1.3, where IMG HT is the height of the imaging surface, fG3 is the combined focal length of the fifth lens to the seventh lens, R1 is the radius of curvature of the object side surface of the first lens, VG2 is the average Abbe number of the second lens to the fourth lens, and VG3 is the average Abbe number of the fifth lens to the seventh lens.

[0024] In another general aspect, the imaging lens system includes a first lens group, a second lens group, and a third lens group sequentially arranged on the optical axis from the object side, where the first lens group and the second lens group can move relative to each other in the optical axis direction between a wide-angle mode position and a telephoto mode position, and where the field of view (FOV) of the imaging lens system is wider than 80 degrees.

[0025] The distance (TTL) from the object side surface of the first lens of the first lens group to the imaging surface can be less than or equal to 7.5 mm.

[0026] The first lens group can include a first lens, the second lens group can include a second lens to a fourth lens, and the third lens group can include a fifth lens to a seventh lens arranged in sequence.

[0027] The camera module can include an imaging lens system and an image sensor having an imaging surface disposed at a position where light incident through the first lens group to the third lens group forms an image.

[0028] Other features and aspects will become apparent in accordance with the appended claims, the drawings, and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a block diagram of an imaging lens system according to a first embodiment (wide-angle mode) of the present disclosure.

[0030] Figure 2 is a block diagram of an imaging lens system according to a first embodiment (telephoto mode) of the present disclosure.

[0031] Figure 3 is Figure 1 the aberration curve of the imaging lens system shown.

[0032] Figure 4 is Figure 2 the aberration curve of the imaging lens system shown.

[0033] Figure 5 is a block diagram of an imaging lens system according to a second embodiment (wide-angle mode) of the present disclosure.

[0034] Figure 6 This is a block diagram of an imaging lens system according to the second embodiment (telephoto mode) of this disclosure.

[0035] Figure 7 yes Figure 5 The aberration curves of the imaging lens system are shown.

[0036] Figure 8 yes Figure 6 The aberration curves of the imaging lens system are shown.

[0037] Figure 9 This is a block diagram of an imaging lens system according to the third embodiment (wide-angle mode) of this disclosure.

[0038] Figure 10 This is a block diagram of an imaging lens system according to the third embodiment (telephoto mode) of this disclosure.

[0039] Figure 11 yes Figure 9 The aberration curves of the imaging lens system are shown.

[0040] Figure 12 yes Figure 10 The aberration curves of the imaging lens system are shown.

[0041] Figure 13 This is a block diagram of an imaging lens system according to the fourth embodiment (wide-angle mode) of this disclosure.

[0042] Figure 14 This is a block diagram of an imaging lens system according to the fourth embodiment (telephoto mode) of this disclosure.

[0043] Figure 15 yes Figure 13 The aberration curves of the imaging lens system are shown.

[0044] Figure 16 yes Figure 14 The aberration curves of the imaging lens system are shown.

[0045] Figure 17 This is an enlarged view of the seventh lens according to the embodiment.

[0046] 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

[0047] In the following, although exemplary embodiments of the concept of the invention will be described in detail with reference to the accompanying drawings, it should be noted that the examples are not limited thereto.

[0048] The following detailed embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents to the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein, except for operations that must occur in a specific order, as will become apparent upon understanding this disclosure. Furthermore, for clarity and brevity, descriptions of features well-known in the art may be omitted.

[0049] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein are provided merely to illustrate some of the many possible ways in which the methods, apparatuses, and / or systems described herein will become apparent upon understanding this disclosure.

[0050] Throughout this specification, when an element such as a layer, region, or substrate is described as being "on," "connected to," or "attached to" another element, the element may be directly "on," directly "connected to," or directly "attached to" the other element, or there may be one or more other elements between the element and the other element. Conversely, when an element is described as being "directly on," "directly connected to," or "directly attached to" another element, there are no other elements between the element and the other element.

[0051] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more items; similarly, “at least one” includes any one of the associated listed items and any combination of any two or more items.

[0052] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited by these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or section from another. Therefore, without departing from the teachings of the examples described herein, the first component, first part, first region, first layer, or first section mentioned in these examples may also be referred to as a second component, second part, second region, second layer, or second section.

[0053] Spatial relative terms such as “above,” “above,” “below,” and “below” may be used herein for descriptive convenience to describe the relationship of one element relative to another, as shown in the accompanying drawings. In addition to covering the orientation depicted in the drawings, these spatial relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “above” another element would be located “below” or “below” that other element. Thus, depending on the spatial orientation of the device, the term “above” covers both orientations of “above” and “below”. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0054] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the articles “a,” “an,” and “the” are intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the stated features, 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.

[0055] Variations in the shapes shown in the figures may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the figures, but include shape variations that may occur during manufacturing.

[0056] It should be noted that in this document, the term "may" is used relative to examples, such as regarding what an example may include or implement, meaning that there exists at least one example that includes or implements such a feature, but not all examples are limited to this.

[0057] The features of the examples described herein can be combined in various ways that will become apparent upon understanding this disclosure. Furthermore, although the examples described herein have multiple configurations, other configurations that will become apparent upon understanding this disclosure are also possible.

[0058] One aspect of this disclosure is to provide an imaging lens system that can be mounted in a portable electronic device and has high optical characteristics (e.g., focus magnification adjustment).

[0059] In this specification, 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 plane (or image sensor). In this specification, the radius of curvature, thickness, TTL (distance from the object-side surface of the first lens to the imaging plane), 2IMG HT (diagonal length of the imaging plane), IMG HT (half of 2IMG HT), and focal length of the lens may be expressed in millimeters (mm).

[0060] Lens thickness, inter-lens spacing, and TTL are distances along the optical axis of the lens. Furthermore, in the interpretation of each lens shape, a convex shape on a surface can mean that the paraxial region of that surface is convex, and a concave shape on a surface can mean that the paraxial region of that surface is concave. Therefore, even when one surface of a lens is described as having a convex shape, the edge (peripheral) portion of the lens can be concave. Similarly, even when one surface of a lens is described as having a concave shape, the edge (peripheral) portion of the lens can be convex.

[0061] An imaging lens system according to an embodiment of the present disclosure 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 arranged sequentially from the object side.

[0062] The imaging lens system according to the embodiment can be configured to be mounted on a thin, portable terminal. For example, the distance (TTL) from the object side of the foremost lens (or first lens) of the imaging lens system to the imaging plane can be greater than 6.0 mm and less than 9.0 mm.

[0063] The imaging lens system according to the embodiment can be configured to have a generally wide field of view. For example, the field of view (FOV) of the imaging lens system can be wider than 85 degrees and narrower than 160 degrees.

[0064] This disclosure can be configured in a form different from the embodiments described above.

[0065] For example, the imaging lens system according to the first embodiment 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 according to this embodiment includes multiple lenses having negative refractive power. For example, in the imaging lens system according to this embodiment, the first lens, the second lens, and the seventh lens may have negative refractive power.

[0066] The imaging lens system according to this embodiment may include a lens having a convex side surface and a lens having a concave side surface. For example, in the imaging lens system, the first lens may have a convex object-side surface, the fourth lens may have a concave image-side surface, and the sixth lens may have a concave object-side surface.

[0067] As another example, the imaging lens system according to the second embodiment can be configured to achieve focus adjustment (AF) and focus magnification adjustment (zoom). For example, the imaging lens system includes a first lens group, a second lens group, and a third lens group arranged sequentially from the object side, and can be configured to achieve focus adjustment and focus magnification adjustment by changing the positions of the first lens group and the second lens group.

[0068] The imaging lens system according to this embodiment can have different focal lengths and fields of view. For example, the imaging lens system can have a field of view wider than 120 degrees or narrower than 95 degrees. The focal length of the imaging lens system according to the former can be smaller than the focal length of the imaging lens system according to the latter.

[0069] In the imaging lens system according to this embodiment, each lens group may include one or more lenses. For example, a first lens group may be configured to include one lens, a second lens group may be configured to include three lenses, and a third lens group may be configured to include three lenses.

[0070] In an imaging lens system, the first to third lens groups can have a predetermined refractive power. For example, the third lens group can have a negative refractive power, the second lens group can have a positive refractive power, and the third lens group can have either a positive or negative refractive power.

[0071] An imaging lens system can alter the field of view by moving the first lens group and the second lens group. For example, an imaging lens system can achieve a field of view narrower than 95 degrees by moving the first lens group in the direction of the imaging plane and moving the second lens group toward the object side. As another example, an imaging lens system can achieve a field of view wider than 120 degrees by moving the first lens group toward the object side and moving the second lens group in the direction of the imaging plane.

[0072] As another example, an imaging lens system according to another embodiment 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 according to this embodiment can satisfy specific conditional expressions. For example, the imaging lens system can satisfy at least one of the following conditional expressions:

[0073] 25 <FOVw / fw<60

[0074] 15 <FOVw / TTLw<25

[0075] 2.0 <D12 / D45<17

[0076] 1.0 <TTLw / TTLt<1.1

[0077] -0.1 <IMG HT / fG3<0.2

[0078] 0.6 <R1 / IMG HT<0.9

[0079] 1.2 <VG2 / VG3<1.3

[0080] 0.5 <d0S14 / IMG HT<0.85

[0081] 0.9 <SAGS14 / T7<1.3

[0082] -0.7 <G1m / G2m<-0.4

[0083] In the above conditional expressions, FOVw is the field of view in wide-angle mode of the imaging lens system (for reference, FOVt is the field of view in telephoto mode), fw is the focal length in wide-angle mode of the imaging lens system, and ft is the focal length in telephoto mode of the lens system. D12 is the distance from the image-side surface of the first lens to the object-side surface of the second lens, D45 is the distance from the image-side surface of the fourth lens to the object-side surface of the fifth lens, TTLw is the TTL (distance from the object-side surface of the first lens to the image plane) in wide-angle mode of the imaging lens system, TTLt is the TTL (distance from the object-side surface of the first lens to the image plane) in telephoto mode of the imaging lens system, and IMG... HT is the height of the image plane, fG3 is the combined focal length of the fifth to seventh lenses, R1 is the radius of curvature of the object-side surface of the first lens, VG2 is the average Abbe number of the second to fourth lenses, VG3 is the average Abbe number of the fifth to seventh lenses, d0S14 is the distance from the point where the first derivative with respect to the image-side surface of the seventh lens becomes 0 to the vertex of the image-side surface of the seventh lens in a direction perpendicular to the optical axis, SAGS14 is the SAG value at the point where the first derivative with respect to the image-side surface of the seventh lens becomes 0, T7 is the thickness of the seventh lens at the center of the optical axis, G1m is the distance the first lens group moves when changing from wide-angle mode to telephoto mode, and G2m is the distance the second lens group moves when changing from wide-angle mode to telephoto mode. For reference, T7, d0S14, and SAGS14 can refer to... Figure 17 The part shown.

[0084] An imaging lens system can satisfy at least one of the following conditional expressions:

[0085] R1 / IMG HT<0.90

[0086] 0.7 <SAGS14 / T7<1.8

[0087] If desired, the imaging lens system may include one or more lenses having the following characteristics. For example, the imaging lens system according to an embodiment may include at least one of a first lens to a seventh lens having the following characteristics. As another example, the imaging lens system according to another embodiment may include two or more of a first lens to a seventh lens having the following characteristics. However, the imaging lens system according to an embodiment of this disclosure or another embodiment need not necessarily include lenses having the following characteristics.

[0088] The characteristics of the first through seventh lenses will be described below.

[0089] The first lens has refractive power. For example, the first lens may have negative refractive power. One surface of the first lens may be convex. For example, the first lens may have a convex object-side surface. The first lens includes a spherical surface or an aspherical surface. For example, both surfaces of the first lens may be spherical. As another example, at least one surface of the first lens may be aspherical. The first lens may be formed of a material with high light transmittance and excellent processability. For example, the first lens may be formed of a plastic material or a glass material. The first lens may be configured to have a high refractive index. For example, the refractive index of the first lens may be greater than 1.7. As another example, the refractive index of the first lens may be greater than 1.70 and less than 1.90. The first lens may have a predetermined Abbe number. For example, the Abbe number of the first lens may be less than 40. As another example, the Abbe number of the first lens may be greater than 20 and less than 40.

[0090] The second lens has refractive power. For example, the second lens can have negative refractive power. One surface of the second lens can be convex. For example, the second lens can have a convex object-side surface. The second lens includes a spherical surface or an aspherical surface. For example, both surfaces of the second lens can be spherical. As another example, at least one surface of the second lens can be aspherical. The second lens can be formed of a material with high light transmittance and excellent processability. For example, the second lens can be formed of a plastic material or a glass material. The second lens can be configured to have a greater refractive index than the first lens. For example, the refractive index of the second lens can be greater than 1.9. As another example, the refractive index of the second lens can be greater than 1.90 and less than 2.0. The second lens can have a predetermined Abbe number. For example, the Abbe number of the second lens can be less than 20. As another example, the Abbe number of the second lens can be greater than 10 and less than 20.

[0091] The third lens has refractive power. For example, the third lens can have positive refractive power. One surface of the third lens can be convex. For example, the third lens can have a convex image-side surface. The third lens includes a spherical surface or an aspherical surface. For example, both surfaces of the third lens can be spherical. As another example, at least one surface of the third lens can be aspherical. The third lens can be formed of a material with high light transmittance and excellent processability. For example, the third lens can be formed of a plastic material. The third lens can be configured to have a lower refractive index than the first lens. For example, the refractive index of the third lens can be greater than 1.6. As another example, the refractive index of the third lens can be greater than 1.5 and less than 1.6. The third lens can have a predetermined Abbe number. For example, the Abbe number of the third lens can be greater than 50. As another example, the Abbe number of the third lens can be greater than 50 and less than 70.

[0092] The fourth lens has refractive power. For example, the fourth lens may have positive refractive power. One surface of the fourth lens may be convex. For example, the fourth lens may have a convex object-side surface. The fourth lens includes a spherical surface or an aspherical surface. For example, both surfaces of the fourth lens may be spherical. As another example, at least one surface of the fourth lens may be aspherical. The fourth lens may be formed of a material with high light transmittance and excellent processability. For example, the fourth lens may be formed of a plastic material. The fourth lens may be configured to have a lower refractive index than the first lens. For example, the refractive index of the fourth lens may be less than 1.6. As another example, the refractive index of the fourth lens may be greater than 1.5 and less than 1.6. The fourth lens may have a predetermined Abbe number. For example, the Abbe number of the fourth lens may be greater than 50. As another example, the Abbe number of the fourth lens may be greater than 50 and less than 70.

[0093] The fifth lens has refractive power. For example, the fifth lens can have negative refractive power. One surface of the fifth lens can be convex. For example, the fifth lens can have a convex object-side surface. The fifth lens includes a spherical surface or an aspherical surface. For example, both surfaces of the fifth lens can be spherical. As another example, at least one surface of the fifth lens can be aspherical. The fifth lens can be formed of a material with high light transmittance and excellent processability. For example, the fifth lens can be formed of a plastic material. The fifth lens can be configured to have a greater refractive index than the third lens. For example, the refractive index of the fifth lens can be greater than 1.6. As another example, the refractive index of the fifth lens can be greater than 1.6 and less than 1.7. The fifth lens can have a predetermined Abbe number. For example, the Abbe number of the fifth lens can be greater than 20. As another example, the Abbe number of the fifth lens can be greater than 20 and less than 30.

[0094] The sixth lens has refractive power. For example, the sixth lens can have positive refractive power. One surface of the sixth lens can be convex. For example, the sixth lens can have a convex image-side surface. The sixth lens includes a spherical surface or an aspherical surface. For example, both surfaces of the sixth lens can be spherical. As another example, at least one surface of the sixth lens can be aspherical. The sixth lens can be formed of a material with high light transmittance and excellent processability. For example, the sixth lens can be formed of a plastic material. The sixth lens can be configured to have a predetermined refractive index. For example, the refractive index of the sixth lens can be less than 1.6. As another example, the refractive index of the sixth lens can be greater than 1.5 and less than 1.6. The sixth lens can have a predetermined Abbe number. For example, the Abbe number of the sixth lens can be greater than 50. As another example, the Abbe number of the sixth lens can be greater than 50 and less than 70.

[0095] The seventh lens has refractive power. For example, the seventh lens can have negative refractive power. One surface of the seventh lens can be convex. For example, the seventh lens can have a convex object-side surface. The seventh lens includes a spherical surface or an aspherical surface. For example, both surfaces of the seventh lens can be spherical. As another example, at least one surface of the seventh lens can be spherical or aspherical. The seventh lens can be formed of a material with high light transmittance and excellent processability. For example, the seventh lens can be formed of a plastic material. The seventh lens can be configured to have a greater refractive index than the third lens. For example, the refractive index of the seventh lens can be greater than 1.6. As another example, the refractive index of the seventh lens can be greater than 1.6 and less than 1.7. The seventh lens can have a predetermined Abbe number. For example, the Abbe number of the seventh lens can be greater than 20. As another example, the Abbe number of the seventh lens can be greater than 20 and less than 30. The seventh lens can include a unique shape. For example, the seventh lens can be configured such that the shape of the central portion on the optical axis differs from the shape of the peripheral portion. For example, the object-side surface of the seventh lens may be convex in the central portion along the optical axis and concave in the peripheral portion. As another example, the image-side surface of the seventh lens may be concave in the central portion along the optical axis and convex in the peripheral portion. Furthermore, the seventh lens may have a shape that forms a recurved point on at least one of its object-side and image-side surfaces.

[0096] The first through seventh lenses may include spherical or aspherical surfaces as described above. When the first through seventh lenses include aspherical surfaces, the aspherical surface of the respective lens can be represented by Equation 1 below.

[0097] Equation 1

[0098]

[0099] 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, a0 to a7 are the aspherical surface constants, and Z (or SAG) is the height from any point on the aspherical surface to the vertex of the aspherical surface in the direction of the optical axis.

[0100] The imaging lens system according to the above embodiments or forms may further include an aperture stop and a filter. For example, the imaging lens system may also include an aperture stop disposed between the second lens and the third lens, or an aperture stop included in the second lens group. As another example, the imaging lens system may also include a filter disposed between the last lens (the seventh lens or the third lens group) and the imaging plane. The aperture stop may be configured to adjust the amount of light incident in the direction of the imaging plane, and the filter may block light of a specific wavelength. For reference, the filter described herein is configured to block infrared light, but the wavelength of light blocked from passing through the filter is not limited to infrared light.

[0101] In the following description, an imaging lens system according to a specific embodiment will be described with reference to the accompanying drawings.

[0102] First, refer to Figure 1 and Figure 2 An imaging lens system according to a first embodiment is described.

[0103] 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.

[0104] The first lens 110 has negative refractive power and a convex object-side surface and a concave image-side surface. The second lens 120 has negative refractive power and a convex object-side surface and a concave image-side surface. The third lens 130 has positive refractive power and a convex object-side surface and a convex image-side surface. The fourth lens 140 has positive refractive power and a convex object-side surface and a concave image-side surface. The fifth lens 150 has negative refractive power and a convex object-side surface and a concave image-side surface. The sixth lens 160 has positive refractive power and a concave object-side surface and a convex image-side surface. The seventh lens 170 has negative refractive power and a convex object-side surface and a concave image-side surface. Furthermore, the seventh lens 170 may have a shape that forms a recurve point on at least one of its object-side surface and image-side surface. Specifically, the object-side surface of the seventh lens 170 may be convex in the central portion along the optical axis and concave in the peripheral portion. Furthermore, the image-side surface of the seventh lens 170 may be concave in the central portion along the optical axis and convex in the peripheral portion.

[0105] The first lens 110 to the seventh lens 170 can be divided into multiple lens groups. For example, the first lens 110 can form the first lens group G1, the second lens 120 to the fourth lens 140 can form the second lens group G2, and the fifth lens 150 to the seventh lens 170 can form the third lens group G3.

[0106] At least one of the first lens 110 to the seventh lens 170 in the imaging lens system 100 can be configured to be movable in the optical axis direction. For example, lenses 110, 120, 130 and 140 constituting the first lens group G1 and the second lens group G2 can be configured to be movable in the optical axis direction.

[0107] The imaging lens system 100 can be configured to perform focus adjustment (AF) and focus magnification adjustment (zoom). For example, the imaging lens system 100 can perform focus adjustment by slightly moving at least one of the first lens group G1 and the second lens group G2 in the optical axis direction. As another example, the imaging lens system 100 can achieve focus magnification adjustment by moving the first lens group G1 and the second lens group G2 in the optical axis direction. For reference, when performing focus adjustment (AF) and focus magnification adjustment (zoom) of the imaging lens system 100, the third lens group G3 may not move, but the third lens group G3 may move by a relatively small amount for the resolution of the imaging lens system 100.

[0108] The imaging lens system 100 may further include an aperture stop and a filter (not shown) as well as an imaging surface IP. For example, the aperture stop may be disposed between the second lens 120 and the third lens 130, and the filter may be disposed between the seventh lens 170 and the imaging surface IP. However, the imaging lens system 100 need not include an aperture stop and a filter. For example, the aperture stop or filter may be omitted if necessary. The imaging surface IP may be disposed at the location where light incident through the first lens 110 to the seventh lens 170 is formed. For example, the imaging surface IP may be formed on a surface of the image sensor IS of the camera module, or on an optical element disposed within the image sensor IS.

[0109] The imaging lens system 100 according to this embodiment can realize two imaging modes. For example, the imaging lens system 100 can be used by... Figure 1 The first imaging mode (or wide-angle mode) is implemented in the form shown. As another example, the imaging lens system 100 can be implemented via... Figure 2The second imaging mode (or telephoto mode) is implemented in the form shown. The change from the first imaging mode to the second imaging mode and vice versa can be performed by changing the positions of the first lens group G1 and the second lens group G2. For example, in the imaging lens system 100 according to the first imaging mode, the imaging lens system 100 according to the second imaging mode can be implemented by moving the first lens group G1 in the direction of the imaging plane and moving the second lens group G2 toward the object side. As another example, in the imaging lens system 100 according to the second imaging mode, the imaging lens system 100 according to the first imaging mode can be implemented by moving the first lens group G1 toward the object side and moving the second lens group G2 in the direction of the imaging plane.

[0110] Next, the characteristics for each imaging mode will be described.

[0111] The imaging lens system 100 according to the first imaging mode can have a field of view of 120 degrees or greater. For example, the imaging lens system 100 according to the first imaging mode can have a field of view of 140 degrees. Compared with the second imaging mode, the imaging lens system 100 according to the first imaging mode can generally image objects located at relatively short distances.

[0112] The imaging lens system 100 can perform focus adjustment in a first imaging mode. For example, the imaging lens system 100 can perform focus adjustment by slightly moving at least one of the first lens group G1 and the second lens group G2 in the optical axis direction.

[0113] The imaging lens system 100 according to the second imaging mode can have a field of view narrower than 95 degrees. For example, the imaging lens system 100 according to the second imaging mode can have a field of view of 90 degrees. Compared with the first imaging mode, the imaging lens system 100 according to the second imaging mode can generally image objects located at relatively long distances.

[0114] The imaging lens system 100 can perform focus adjustment in a second imaging mode. For example, the imaging lens system 100 can perform focus adjustment by slightly moving at least one of the first lens group G1 and the second lens group G2 in the optical axis direction.

[0115] The imaging lens system 100 configured as described above presents the following: Figure 3 and Figure 4 The different aberration characteristics are shown. Tables 1 to 3 show the lens characteristics and aspherical values ​​of the imaging lens system according to this embodiment.

[0116] Table 1

[0117] Face number refer to radius of curvature Thickness / Distance Refractive index Abbe number focal length S1 First lens 2.05508 0.34765 1.7486 35.50 -4.125 S2 1.14459 d1 S3 Second lens 3.50743 1.00000 1.9460 17.90 -24.171 S4 2.61949 0.09435 S5 Third lens 2.15412 0.44376 1.5350 55.70 2.165 S6 -2.32655 0.13981 S7 Fourth lens 4.22636 0.35421 1.5350 55.70 23.985 S8 6.11796 d2 S9 Fifth lens 3.71295 0.25000 1.6349 24.00 -24.484 S10 2.91876 0.49187 S11 Sixth lens -4.07751 0.63624 1.5350 55.70 3.670 S12 -1.39739 0.48444 S13 Seventh Lens 2.90261 0.47002 1.6349 24.00 -3.314 S14 1.14319 d3 S15 Imaging surface infinity d4

[0118] Table 2

[0119] refer to Wide-angle mode Telephoto mode d1 1.496 1.016 d2 0.140 0.449 d3 1.007 1.011 d4 0.003 -0.001

[0120] Table 3

[0121]

[0122]

[0123] In Table 3, rN refers to the effective diameter of the seventh lens.

[0124] Reference Figure 5 and Figure 6 An imaging lens system according to a second embodiment is described.

[0125] 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.

[0126] 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 negative 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 concave image-side surface. The fifth lens 250 has negative refractive power and a convex object-side surface and a concave image-side surface. The sixth lens 260 has positive refractive power and a concave object-side surface and a convex image-side surface. The seventh lens 270 has negative refractive power and a convex object-side surface and a concave image-side surface. Furthermore, the seventh lens 270 may have a shape that forms a curvature point on at least one of its object-side surface and image-side surface. Specifically, the object-side surface of the seventh lens 270 may be convex in the central portion along the optical axis and concave in the peripheral portion. Furthermore, the image-side surface of the seventh lens 270 may be concave in the central portion of the optical axis and convex in the peripheral portion.

[0127] The first lens 210 to the seventh lens 270 can be divided into multiple lens groups. For example, the first lens 210 can form a first lens group G1, the second lens 220 to the fourth lens 240 can form a second lens group G2, and the fifth lens 250 to the seventh lens 270 can form a third lens group G3.

[0128] At least one of the first lens 210 to the seventh lens 270 in the imaging lens system 200 can be configured to be movable in the optical axis direction. For example, lenses 210, 220, 230 and 240 constituting the first lens group G1 and the second lens group G2 can be configured to be movable in the optical axis direction.

[0129] The imaging lens system 200 can be configured to perform focus adjustment (AF) and focus magnification adjustment (zoom). For example, the imaging lens system 200 can perform focus adjustment by slightly moving at least one of the first lens group G1 and the second lens group G2 in the optical axis direction. As another example, the imaging lens system 200 can achieve focus magnification adjustment by moving both the first lens group G1 and the second lens group G2 in the optical axis direction. For reference, when performing focus adjustment (AF) and focus magnification adjustment (zoom) of the imaging lens system 200, the third lens group G3 may not move, but for the resolution of the imaging lens system 200, the third lens group G3 may move by a relatively small amount.

[0130] The imaging lens system 200 may also include an aperture stop and a filter (not shown), as well as an imaging surface IP. For example, the aperture stop may be disposed between the second lens 220 and the third lens 230, and the filter may be disposed between the seventh lens 270 and the imaging surface IP. However, the imaging lens system 200 need not include an aperture stop and a filter. For example, the aperture stop or filter may be omitted if necessary. The imaging surface IP may be disposed at the location where light incident through the first lens 210 to the seventh lens 270 is formed. For example, the imaging surface IP may be formed on a surface of the image sensor IS of the camera module, or on an optical element disposed within the image sensor IS.

[0131] The imaging lens system 200 according to this embodiment can realize two imaging modes. For example, the imaging lens system 200 can be used by... Figure 5 The first imaging mode (or wide-angle mode) is implemented in the form shown. As another example, the imaging lens system 200 can be implemented via... Figure 6The second imaging mode (or telephoto mode) is implemented in the form shown. The change from the first imaging mode to the second imaging mode and vice versa can be performed by changing the positions of the first lens group G1 and the second lens group G2. For example, in the imaging lens system 200 according to the first imaging mode, the imaging lens system 200 according to the second imaging mode can be implemented by moving the first lens group G1 in the direction of the imaging plane and moving the second lens group G2 toward the object side. As another example, in the imaging lens system 200 according to the second imaging mode, the imaging lens system 200 according to the first imaging mode can be implemented by moving the first lens group G1 toward the object side and moving the second lens group G2 in the direction of the imaging plane.

[0132] Next, the characteristics for each imaging mode will be described.

[0133] The imaging lens system 200 according to the first imaging mode can have a field of view of 120 degrees or greater. For example, the imaging lens system 200 according to the first imaging mode can have a field of view of 140 degrees. Compared with the second imaging mode, the imaging lens system 200 according to the first imaging mode can generally image objects located at relatively short distances.

[0134] The imaging lens system 200 can perform focus adjustment in a first imaging mode. For example, the imaging lens system 200 can perform focus adjustment by slightly moving at least one of the first lens group G1 and the second lens group G2 in the optical axis direction.

[0135] The imaging lens system 200 according to the second imaging mode can have a field of view narrower than 95 degrees. For example, the imaging lens system 200 according to the second imaging mode can have a field of view of 90 degrees. Compared with the first imaging mode, the imaging lens system 200 according to the second imaging mode can generally image objects located at relatively long distances.

[0136] The imaging lens system 200 can perform focus adjustment in a second imaging mode. For example, the imaging lens system 200 can perform focus adjustment by slightly moving at least one of the first lens group G1 and the second lens group G2 in the optical axis direction.

[0137] The imaging lens system 200 configured as described above presents the following: Figure 7 and Figure 8 The different aberration characteristics are shown. Tables 4 to 6 show the lens characteristics and aspherical values ​​of the imaging lens system according to this embodiment.

[0138] Table 4

[0139]

[0140]

[0141] Table 5

[0142] refer to Wide-angle mode Telephoto mode d1 1.496 1.016 d2 0.134 0.433 d3 1.200 1.203 d4 0.003 0.000

[0143] Table 6

[0144] refer to S14 rN 2.6 k -4.80696300 <![CDATA[a0]]> -0.64638130 <![CDATA[a1]]> 0.06077927 <![CDATA[a2]]> -0.01451804 <![CDATA[a3]]> -0.00030858 <![CDATA[a4]]> -0.00020951 <![CDATA[a5]]> -0.00092674 <![CDATA[a6]]> 0.00070064 <![CDATA[a7]]> -0.00052021 <![CDATA[a8]]> 0.00030858 <![CDATA[a9]]> -0.00034696 <![CDATA[a 10 ]]> 0.00004433 <![CDATA[a 11 ]]> 0.00002100 <![CDATA[a 12 ]]> 0.00007339 <![CDATA[a 13 ]]> -0.00003449

[0145] In Table 6, rN refers to the effective diameter of the seventh lens.

[0146] Reference Figure 9 and Figure 10 An imaging lens system according to a third embodiment is described.

[0147] 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.

[0148] The first lens 310 has negative refractive power and a convex object-side surface and a concave 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 positive refractive power and a convex object-side surface and a convex image-side surface. The fourth lens 340 has positive refractive power and a convex object-side surface and a concave image-side surface. The fifth lens 350 has negative refractive power and a convex object-side surface and a concave image-side surface. The sixth lens 360 has positive refractive power and a concave object-side surface and a convex image-side surface. The seventh lens 370 has negative refractive power and a convex object-side surface and a concave image-side surface. Furthermore, the seventh lens 370 may have a shape that forms a curvature point on at least one of its object-side surface and image-side surface. Specifically, the object-side surface of the seventh lens 370 may be convex in the central portion along the optical axis and concave in the peripheral portion. Furthermore, the image-side surface of the seventh lens 370 may be concave in the central portion of the optical axis and convex in the peripheral portion.

[0149] The first lens 310 to the seventh lens 370 can be divided into multiple lens groups. For example, the first lens 310 can form a first lens group G1, the second lens 320 to the fourth lens 340 can form a second lens group G2, and the fifth lens 350 to the seventh lens 370 can form a third lens group G3.

[0150] At least one of the first lens 310 to the seventh lens 370 in the imaging lens system 300 can be configured to be movable in the optical axis direction. For example, lenses 310, 320, 330 and 340 constituting the first lens group G1 and the second lens group G2 can be configured to be movable in the optical axis direction.

[0151] The imaging lens system 300 can be configured to perform focus adjustment (AF) and focus magnification adjustment (zoom). For example, the imaging lens system 300 can perform focus adjustment by slightly moving at least one of the first lens group G1 and the second lens group G2 in the optical axis direction. As another example, the imaging lens system 300 can achieve focus magnification adjustment by moving both the first lens group G1 and the second lens group G2 in the optical axis direction. For reference, when performing focus adjustment (AF) and focus magnification adjustment (zoom) of the imaging lens system 300, the third lens group G3 may not move, but for the resolution of the imaging lens system 300, the third lens group G3 may move by a relatively small amount.

[0152] The imaging lens system 300 may further include an aperture stop (not shown) and a filter IF, as well as an imaging surface IP. For example, the aperture stop may be disposed between the second lens 320 and the third lens 330, and the filter IF may be disposed between the seventh lens 370 and the imaging surface IP. However, the imaging lens system 300 need not include an aperture stop and a filter IF. For example, the aperture stop or the filter IF may be omitted if necessary. The imaging surface IP may be formed at the location where light incident through the first lens 310 to the seventh lens 370 is formed. For example, the imaging surface IP may be formed on a surface of the image sensor IS of the camera module, or on an optical element disposed within the image sensor IS.

[0153] The imaging lens system 300 according to this embodiment can realize two imaging modes. For example, the imaging lens system 300 can be used by... Figure 9 The form shown implements the first imaging mode (or wide-angle mode). As another example, the imaging lens system 300 can be implemented via... Figure 10The second imaging mode (or telephoto mode) is implemented in the form shown. The change from the first imaging mode to the second imaging mode and vice versa can be performed by changing the positions of the first lens group G1 and the second lens group G2. For example, in the imaging lens system 300 according to the first imaging mode, the imaging lens system 300 according to the second imaging mode can be implemented by moving the first lens group G1 in the direction of the imaging plane and moving the second lens group G2 toward the object side. As another example, in the imaging lens system 300 according to the second imaging mode, the imaging lens system 300 according to the first imaging mode can be implemented by moving the first lens group G1 toward the object side and moving the second lens group G2 in the direction of the imaging plane.

[0154] Next, the characteristics for each imaging mode will be described.

[0155] The imaging lens system 300 according to the first imaging mode can have a field of view of 120 degrees or greater. For example, the imaging lens system 300 according to the first imaging mode can have a field of view of 140 degrees. Compared with the second imaging mode, the imaging lens system 300 according to the first imaging mode can generally image objects located at relatively short distances.

[0156] The imaging lens system 300 can perform focus adjustment in a first imaging mode. For example, the imaging lens system 300 can perform focus adjustment by slightly moving at least one of the first lens group G1 and the second lens group G2 in the optical axis direction.

[0157] The imaging lens system 300 according to the second imaging mode can have a field of view narrower than 95 degrees. For example, the imaging lens system 300 according to the second imaging mode can have a field of view of 90 degrees. Compared with the first imaging mode, the imaging lens system 300 according to the second imaging mode can generally image objects located at relatively long distances.

[0158] The imaging lens system 300 can perform focus adjustment in a second imaging mode. For example, the imaging lens system 300 can perform focus adjustment by slightly moving at least one of the first lens group G1 and the second lens group G2 in the optical axis direction.

[0159] The imaging lens system 300 configured as described above presents the following: Figure 11 and Figure 12 The different aberration characteristics are shown. Tables 7 to 9 show the lens characteristics and aspherical values ​​of the imaging lens system according to this embodiment.

[0160] Table 7

[0161] Face number refer to radius of curvature Thickness / Distance Refractive index Abbe number focal length S1 First lens 2.58242 0.35000 1.882 37.20 -3.960 S2 1.39039 d1 S3 Second lens 2.90989 0.87342 1.946 17.90 -166.654 S4 2.44026 0.10002 S5 Third lens 2.12693 0.44605 1.516 64.10 2.587 S6 -3.33500 0.16467 S7 Fourth lens 2.94234 0.35000 1.535 55.70 10.497 S8 5.92425 d2 S9 Fifth lens 3.77397 0.25000 1.635 24.00 -15.441 S10 2.65490 0.64015 S11 Sixth lens -2.54165 0.53165 1.589 61.20 2.689 S12 -1.05153 0.32742 S13 Seventh Lens 1.78450 0.35000 1.635 24.00 -2.985 S14 0.84916 d3 S15 Imaging surface infinity d4

[0162] Table 8

[0163] refer to Wide-angle mode Telephoto mode d1 1.609 1.109 d2 0.100 0.444 d3 1.236 1.236 d4 0.000 0.000

[0164] Table 9

[0165]

[0166]

[0167] In Table 9, rN refers to the effective diameter of the seventh lens.

[0168] Reference Figure 13 and Figure 14 An imaging lens system according to a fourth embodiment is described.

[0169] 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.

[0170] The first lens 410 has negative refractive power and a convex object-side surface and a concave 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 positive refractive power and a convex object-side surface and a convex image-side surface. The fourth lens 440 has positive refractive power and a convex object-side surface and a concave image-side surface. The fifth lens 450 has negative refractive power and a convex object-side surface and a concave image-side surface. The sixth lens 460 has positive refractive power and a concave object-side surface and a convex image-side surface. The seventh lens 470 has negative refractive power and a convex object-side surface and a concave image-side surface. Furthermore, the seventh lens 470 may have a shape that forms a recurve point on at least one of its object-side surface and image-side surface. Specifically, the object-side surface of the seventh lens 470 may be convex in the central portion along the optical axis and concave in the peripheral portion. Furthermore, the image-side surface of the seventh lens 470 may be concave in the central portion of the optical axis and convex in the peripheral portion.

[0171] The first lens 410 to the seventh lens 470 can be divided into multiple lens groups. For example, the first lens 410 can form a first lens group G1, the second lens 420 to the fourth lens 440 can form a second lens group G2, and the fifth lens 450 to the seventh lens 470 can form a third lens group G3.

[0172] At least one of the first lens 410 to the seventh lens 470 in the imaging lens system 400 can be configured to be movable in the optical axis direction. For example, lenses 410, 420, 430 and 440 constituting the first lens group G1 and the second lens group G2 can be configured to be movable in the optical axis direction.

[0173] The imaging lens system 400 can be configured to perform focus adjustment (AF) and focus magnification adjustment (zoom). For example, the imaging lens system 400 can perform focus adjustment by slightly moving at least one of the first lens group G1 and the second lens group G2 in the optical axis direction. As another example, the imaging lens system 400 can achieve focus magnification adjustment by moving both the first lens group G1 and the second lens group G2 in the optical axis direction. For reference, when performing focus adjustment (AF) and focus magnification adjustment (zoom) of the imaging lens system 400, the third lens group G3 may not move, but for the resolution of the imaging lens system 400, the third lens group G3 may move by a relatively small amount.

[0174] The imaging lens system 400 may further include an aperture stop (not shown), a filter IF, and an imaging surface IP. For example, the aperture stop may be disposed between the second lens 420 and the third lens 430, and the filter IF may be disposed between the seventh lens 470 and the imaging surface IP. However, the imaging lens system 400 need not include an aperture stop and a filter IF. For example, the aperture stop or the filter IF may be omitted if necessary. The imaging surface IP may be disposed at the location where light incident through the first lens 410 to the seventh lens 470 is formed. For example, the imaging surface IP may be formed on a surface of the image sensor IS of the camera module, or on an optical element disposed within the image sensor IS.

[0175] The imaging lens system 400 according to this embodiment can realize two imaging modes. For example, the imaging lens system 400 can be used by... Figure 13 The form shown implements the first imaging mode (or wide-angle mode). As another example, the imaging lens system 400 can be implemented via... Figure 14The second imaging mode (or telephoto mode) is implemented in the form shown. The change from the first imaging mode to the second imaging mode and vice versa can be performed by changing the positions of the first lens group G1 and the second lens group G2. For example, in the imaging lens system 400 according to the first imaging mode, the imaging lens system 400 according to the second imaging mode can be implemented by moving the first lens group G1 in the direction of the imaging plane and moving the second lens group G2 toward the object side. As another example, in the imaging lens system 400 according to the second imaging mode, the imaging lens system 400 according to the first imaging mode can be implemented by moving the first lens group G1 toward the object side and moving the second lens group G2 in the direction of the imaging plane.

[0176] Next, the characteristics for each imaging mode will be described.

[0177] The imaging lens system 400 according to the first imaging mode can have a field of view of 120 degrees or greater. For example, the imaging lens system 400 according to the first imaging mode can have a field of view of 140 degrees. Compared with the second imaging mode, the imaging lens system 400 according to the first imaging mode can generally image objects located at relatively short distances.

[0178] The imaging lens system 400 can perform focus adjustment in a first imaging mode. For example, the imaging lens system 400 can perform focus adjustment by slightly moving at least one of the first lens group G1 and the second lens group G2 in the optical axis direction.

[0179] The imaging lens system 400 according to the second imaging mode can have a field of view narrower than 95 degrees. For example, the imaging lens system 400 according to the second imaging mode can have a field of view of 90 degrees. Compared with the first imaging mode, the imaging lens system 400 according to the second imaging mode can generally image objects located at relatively long distances.

[0180] The imaging lens system 400 can perform focus adjustment in a second imaging mode. For example, the imaging lens system 400 can perform focus adjustment by slightly moving at least one of the first lens group G1 and the second lens group G2 in the optical axis direction.

[0181] The imaging lens system 400 configured as described above presents... Figure 15 and Figure 16 The different aberration characteristics are shown. Tables 10 to 12 show the lens characteristics and aspherical values ​​of the imaging lens system according to this embodiment.

[0182] Table 10

[0183] Face number refer to radius of curvature Thickness / Distance Refractive index Abbe number focal length S1 First lens 2.55633 0.35149 1.882 37.20 -4.167 S2 1.41055 d1 S3 Second lens 2.80951 0.88019 1.946 17.90 -108.656 S4 2.31827 0.10000 S5 Third lens 2.11695 0.50037 1.516 64.10 2.626 S6 -3.46722 0.10000 S7 Fourth lens 2.79332 0.35000 1.535 55.70 9.504 S8 5.92767 d2 S9 Fifth lens 3.95935 0.25000 1.635 24.00 -14.576 S10 2.70504 0.64245 S11 Sixth lens -2.46168 0.54967 1.589 61.20 2.420 S12 -0.97743 0.27300 S13 Seventh Lens 1.96292 0.37024 1.635 24.00 -2.690 S14 0.84640 d3 S15 Imaging surface d4

[0184] Table 11

[0185]

[0186]

[0187] Table 12

[0188] refer to S14 rN 2.67 k -4.765483 <![CDATA[a0]]> -0.702177 <![CDATA[a1]]> 0.079720 <![CDATA[a2]]> -0.015847 <![CDATA[a3]]> -0.001304 <![CDATA[a4]]> -0.001923 <![CDATA[a5]]> -0.001332 <![CDATA[a6]]> 0.000515 <![CDATA[a7]]> -0.000535 <![CDATA[a8]]> 0.000346 <![CDATA[a9]]> -0.000229 <![CDATA[a 10 ]]> 0.000070 <![CDATA[a 11 ]]> -0.000013 <![CDATA[a 12 ]]> 0.000068 <![CDATA[a 13 ]]> -0.000029

[0189] In Table 12, rN refers to the effective diameter of the seventh lens.

[0190] Table 13 shows the characteristic values ​​of the imaging lens system according to the first to fourth embodiments.

[0191] Table 13

[0192] refer to First Implementation Method Second Implementation Method Third Implementation Method Fourth Implementation Method fw(mm) 2.5690 2.5970 2.5690 2.4510 ft(mm) 3.0000 3.0000 3.0020 2.8940 TTLw(mm) 7.3584 7.4283 7.3283 7.3283 TTLt(mm) 7.1870 7.2935 7.1718 7.1228 FOVw(°) 140.0 140.0 140.0 140.0 FOVt(°) 90.0 90.0 90.0 90.0 IMG HT (mm) 3.000 3.000 3.000 3.000

[0193] The imaging lens system described herein may have the following characteristics. For example, the focal length of the imaging lens system is 2.4 mm to 3.2 mm, the TTL of the imaging lens system is 7.0 mm to 7.8 mm, the focal length of the first lens is -5.0 mm to -3.8 mm, the focal length of the second lens is -200 mm to -20 mm, the focal length of the third lens is 1.8 mm to 3.0 mm, the focal length of the fourth lens is 12 mm to 30 mm, the focal length of the fifth lens is -50 mm to -10 mm, the focal length of the sixth lens is 2.0 mm to 4.6 mm, and the focal length of the seventh lens is -4.6 mm to -2.0 mm.

[0194] Table 14 shows the conditional expression values ​​for the imaging lens systems according to the first to fourth embodiments.

[0195] Table 14

[0196] conditional expression First Implementation Method Second Implementation Method Third Implementation Method Fourth Implementation Method FOVw / fw 54.4959 53.9084 54.4959 57.1195 FOVw / TTLw 19.0260 18.8469 19.1041 19.1041 D12 / D45 10.6799 10.9532 16.0886 16.3577 TTLw / TTLt 1.0239 1.0185 1.0218 1.0289 IMG HT / fG3 -0.0371 0.1620 0.0975 0.1207 R1 / IMG HT 0.6990 0.6464 0.8608 0.8521 VG2 / VG3 1.2469 1.2610 1.2610 1.2610 d0S14 / IMG HT 0.5714 0.7325 0.7705 0.7482 SAGS14 / T7 0.7691 1.2265 1.7107 1.5589 G1m / G2m -0.5557 -0.4513 -0.4553 -0.6332

[0197] As described above, according to this disclosure, an imaging lens system that can be mounted on a small camera module and whose focus magnification can be adjusted can be provided.

[0198] While specific exemplary embodiments have been shown and described above, it will be apparent upon understanding this disclosure that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein should be understood in a descriptive sense only and not for limiting purposes. The description of features or aspects in each example should be understood as applicable to similar features or aspects in other examples. Appropriate results may still be achieved if the described techniques are performed in a different order, and / or if components in the described system, architecture, device, or circuit are combined in a different manner and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of this disclosure is not limited by the specific embodiments but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in this disclosure.

Claims

1. An imaging lens system, comprising: The first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens are arranged sequentially from the object side. The first lens has negative refractive power, a convex object-side surface, and a concave image-side surface; the second lens has negative refractive power, a convex object-side surface, and a concave image-side surface; the third lens has positive refractive power, a convex object-side surface, and a convex image-side surface; the fourth lens has positive refractive power, a convex object-side surface, and a concave image-side surface; the fifth lens has negative refractive power, a convex object-side surface, and a concave image-side surface; the sixth lens has positive refractive power, a concave object-side surface, and a convex image-side surface; and the seventh lens has negative refractive power, a convex object-side surface, and a concave image-side surface. At least one of the first to the seventh lenses includes an aspherical surface. The first lens group, including the first lens, and the second lens group, including the second to the fourth lenses, are capable of moving relative to each other along the optical axis between the wide-angle mode position and the telephoto mode position. The imaging lens system contains seven lenses with refractive power. The imaging lens system has a field of view wider than 85 degrees and narrower than 160 degrees. The distance from the object surface of the first lens to the imaging surface is greater than 6.0 mm and less than 9.0 mm.

2. The imaging lens system according to claim 1, wherein, The following conditional expression is satisfied: 25 < FOVw / fw < 60, Wherein, FOVw is the field of view in the wide-angle mode of the imaging lens system, and fw is the focal length in the wide-angle mode of the imaging lens system.

3. The imaging lens system according to claim 1, wherein, The following conditional expression is satisfied: 15 < FOVw / TTLw < 25, Wherein, FOVw is the field of view in the wide-angle mode of the imaging lens system, and TTLw is the distance from the object side of the first lens to the imaging surface in the wide-angle mode of the imaging lens system.

4. The imaging lens system according to claim 1, wherein, The following conditional expression is satisfied: 2.0 < D12 / D45 < 17, Wherein, D12 is the distance from the image side of the first lens to the object side of the second lens, and D45 is the distance from the image side of the fourth lens to the object side of the fifth lens.

5. The imaging lens system according to claim 1, wherein, The following conditional expression is satisfied: 1.0 < TTLw / TTLt < 1.1 Wherein, TTLw is the distance from the object side of the first lens to the imaging surface in the wide-angle mode of the imaging lens system, and TTLt is the distance from the object side of the first lens to the imaging surface in the telephoto mode of the imaging lens system.

6. Camera module, including: The imaging lens system according to claim 1; as well as An image sensor having an imaging surface located at the position where light incident through the first lens to the seventh lens is formed.

7. An imaging lens system, including: The first lens has negative refractive power, a convex object side, and a concave image side; The second lens has negative refractive power, a convex object side, and a concave image side; The third lens has positive refractive power, a convex object side, and a convex image side; The fourth lens has positive refractive power, a convex object-side surface, and a concave image-side surface; The fifth lens has negative refractive power, a convex object-side surface, and a concave image-side surface; The sixth lens has positive refractive power, a concave object-side surface, and a convex image-side surface; as well as The seventh lens has negative refractive power, a convex object-side surface, and a concave image-side surface. At least one of the first to the seventh lenses includes an aspherical surface. The first lens to the seventh lens are arranged sequentially from the object side with air gaps. The first lens group, including the first lens, and the second lens group, including the second to the fourth lenses, are capable of moving relative to each other along the optical axis between a wide-angle mode position and a telephoto mode position. The imaging lens system contains seven lenses with refractive power.

8. The imaging lens system according to claim 7, wherein, The seventh lens has a shape in which an inflection point is formed on at least one of the object-side surface and the image-side surface of the seventh lens.

9. The imaging lens system according to claim 7, wherein, At least one of the following conditional expressions must be satisfied: -0.1 < IMG HT / fG3 < 0.2, 0.6 < R1 / IMG HT < 0.9, and 1.2 < VG2 / VG3 < 1.3, Wherein, IMG HT is the height of the imaging plane, fG3 is the combined focal length of the fifth to the seventh lens, R1 is the radius of curvature of the object side of the first lens, VG2 is the average Abbe number of the second to the fourth lens, and VG3 is the average Abbe number of the fifth to the seventh lens.

10. Camera module, including: The imaging lens system according to claim 7; as well as An image sensor has an imaging surface positioned at the location where light incident through the first lens to the seventh lens is formed.

11. An imaging lens system, comprising: The first lens group, the second lens group, and the third lens group are sequentially arranged on the optical axis from the object side. The first lens group and the second lens group are capable of moving relative to each other along the optical axis between the wide-angle mode position and the telephoto mode position. Wherein, at least one of the first lens group, the second lens group, and the third lens group includes a lens having an aspherical surface. The first lens group includes a first lens; the second lens group includes a second lens, a third lens, and a fourth lens arranged sequentially; and the third lens group includes a fifth lens, a sixth lens, and a seventh lens arranged sequentially. The first lens has negative refractive power, a convex object-side surface, and a concave image-side surface; the second lens has negative refractive power, a convex object-side surface, and a concave image-side surface; the third lens has positive refractive power, a convex object-side surface, and a convex image-side surface; the fourth lens has positive refractive power, a convex object-side surface, and a concave image-side surface; the fifth lens has negative refractive power, a convex object-side surface, and a concave image-side surface; the sixth lens has positive refractive power, a concave object-side surface, and a convex image-side surface; and the seventh lens has negative refractive power, a convex object-side surface, and a concave image-side surface. The imaging lens system contains seven lenses with refractive power. The field of view of the imaging lens system is greater than 80 degrees.

12. The imaging lens system according to claim 11, wherein, The distance from the object surface of the first lens of the first lens group to the imaging surface is less than or equal to 7.5 mm.

13. A camera module, including: The imaging lens system according to claim 11; as well as An image sensor has an imaging surface positioned at the location where light incident through the first lens group to the third lens group is formed.

Images