Optical lens for image pickup

Abstract

The application discloses a camera optical lens, which comprises seven lenses. The seven lenses are sequentially arranged from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The seven lenses respectively have an object side surface facing the object side direction and an image side surface facing the image side direction. The first lens has positive refractive power. The image side surface of the sixth lens is concave at the vicinity of the optical axis. The object side surface of the seventh lens is concave at the vicinity of the optical axis. The total number of lenses in the camera optical lens is seven. At least one surface of all the lens surfaces of the seven lenses is aspheric and has at least one inflection point. The interval distance of the sixth lens and the seventh lens on the optical axis is the maximum value among all the interval distances of every two adjacent lenses on the optical axis. When certain conditions are met, the camera optical lens can meet the requirements of miniaturization and large aperture at the same time.

Description

[0001] This application is a divisional application. The original application was filed on April 12, 2018; the application number is 201810327295.1; and the invention title is: Optical Lens for Camera, Image Capture Device and Electronic Device. Technical Field

[0002] This invention relates to an optical lens for imaging, and more particularly to an optical lens for imaging suitable for electronic devices. Background Technology

[0003] With advancements in semiconductor technology, the performance of electronic image sensors has improved, allowing pixels to reach smaller sizes. As a result, optical lenses with high image quality have become an indispensable component.

[0004] As technology advances rapidly, electronic devices equipped with optical lenses are being used in a wider range of applications, leading to more diverse requirements for these lenses. Because traditional optical lenses often struggle to balance requirements such as image quality, sensitivity, aperture size, size, and viewing angle, this invention provides an optical lens that meets these needs. Summary of the Invention

[0005] This invention provides a camera optical lens comprising seven lenses. Under certain conditions, the camera optical lens provided by this invention can simultaneously meet the requirements of miniaturization and a large aperture.

[0006] This invention provides an optical lens for imaging, comprising seven lenses. The seven lenses, arranged sequentially from the object side to the image side, are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. Each of the seven lenses has an object-side surface facing the object side and an image-side surface facing the image side. The first lens has positive refractive power. The image-side surface of the sixth lens is concave near the optical axis. The object-side surface of the seventh lens is also concave near the optical axis. The total number of lenses in the optical lens is seven, and at least one surface of all seven lenses is aspherical and has at least one inflection point. The distance between the sixth and seventh lenses on the optical axis is the maximum value among all distances between any two adjacent lenses on the optical axis. The focal length of the camera lens is f, the radius of curvature of the image-side surface of the sixth lens is R12, the distance from the object-side surface of the first lens to the imaging plane on the optical axis is TL, the maximum imaging height of the camera lens is ImgH, the number of lenses with an Abbe number less than 20 among the seven lenses of the camera lens is V20, the maximum effective radius of the object-side surface of the first lens is Y11, and the maximum effective radius of the image-side surface of the seventh lens is Y72. These conditions must be met:

[0007] 0≤f / R12;

[0008] TL / ImgH < 1.75;

[0009] 2≤V20; and

[0010] 0.10 <Y11 / Y72<0.60。

[0011] The present invention also provides an optical lens for imaging, comprising seven lenses. The seven lenses, arranged sequentially from the object side to the image side, are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. Each of the seven lenses has an object-side surface facing the object side and an image-side surface facing the image side. The first lens has positive refractive power. The image-side surface of the sixth lens is concave near the optical axis. The object-side surface of the seventh lens is also concave near the optical axis. The total number of lenses in the optical lens is seven, and at least one surface of all seven lenses is aspherical and has at least one inflection point. The distance between the sixth and seventh lenses on the optical axis is the maximum value among all distances between any two adjacent lenses on the optical axis. The focal length of the camera lens is f, the radius of curvature of the image-side surface of the sixth lens is R12, the distance from the object-side surface of the first lens to the imaging plane on the optical axis is TL, the maximum imaging height of the camera lens is ImgH, the number of lenses with an Abbe number less than 20 among the seven lenses of the camera lens is V20, the focal length of the sixth lens is f6, the focal length of the seventh lens is f7, and it satisfies the following conditions:

[0012] 0≤f / R12;

[0013] TL / ImgH < 1.75;

[0014] 2≤V20; and

[0015] -1.20≤f6 / f7<2.00.

[0016] When f / R12 meets the above conditions, it is beneficial to adjust the shape of the sixth lens and the intensity configuration of the refractive force, which can improve the design flexibility of the camera optical lens.

[0017] When TL / ImgH meets the above conditions, it helps to miniaturize the optical lens for camera use.

[0018] When the V20 meets the above conditions, it helps to enhance the ability of the camera lens to eliminate chromatic aberration, and can further improve the image quality of the periphery and the overall image.

[0019] When Y11 / Y72 meet the above conditions, the size configuration of each lens is more suitable for miniaturized electronic devices, which can avoid the problem of insufficient lens space due to the first lens being too large, and can also avoid the problem of insufficient light intake due to the seventh lens being too small, resulting in unclear images.

[0020] When f6 / f7 meets the above conditions, it can provide a better refractive power distribution for the sixth and seventh lenses, which helps to achieve a balance between correcting the quality of the image center and the periphery.

[0021] The foregoing description of the invention and the following description of the embodiments are intended to demonstrate and explain the spirit and principles of the invention, and to provide a further explanation of the claims. Attached Figure Description

[0022] Figure 1 A schematic diagram of an image-capturing device according to a first embodiment of the present invention is shown.

[0023] Figure 2 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the first embodiment.

[0024] Figure 3 A schematic diagram of an image-capturing device according to a second embodiment of the present invention is shown.

[0025] Figure 4 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the second embodiment.

[0026] Figure 5 A schematic diagram of an image-capturing device according to a third embodiment of the present invention is shown.

[0027] Figure 6 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the third embodiment.

[0028] Figure 7 A schematic diagram of an image-capturing device according to a fourth embodiment of the present invention is shown.

[0029] Figure 8 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the fourth embodiment.

[0030] Figure 9 A schematic diagram of an image-capturing device according to a fifth embodiment of the present invention is shown.

[0031] Figure 10 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the fifth embodiment.

[0032] Figure 11 A schematic diagram of an image-capturing device according to a sixth embodiment of the present invention is shown.

[0033] Figure 12 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the sixth embodiment.

[0034] Figure 13 A schematic diagram of an image-capturing device according to a seventh embodiment of the present invention is shown.

[0035] Figure 14 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the seventh embodiment.

[0036] Figure 15 A perspective view of an imaging device according to an eighth embodiment of the present invention is shown.

[0037] Figure 16 A perspective view of one side of an electronic device according to a ninth embodiment of the present invention is shown.

[0038] Figure 17 Draw Figure 16 A three-dimensional view of the other side of the electronic device.

[0039] Figure 18 Draw Figure 16 System block diagram of an electronic device.

[0040] Figure 19 A schematic diagram illustrating parameters Y11, Y72, and the critical point and inflection point of the seventh lens according to the first embodiment of the present invention is shown.

[0041] In the attached figures, the following labels are used:

[0042] Image capturing devices: 10, 10a, 10b

[0043] Imaging lens: 11

[0044] Drive unit: 12

[0045] Electronic photosensitive element: 13

[0046] Image stabilization module: 14

[0047] Electronic devices: 20

[0048] Flash module: 21

[0049] Focusing assist module: 22

[0050] Image signal processor: 23

[0051] User Interface: 24

[0052] Image software processor: 25

[0053] Subject: 26

[0054] Critical point: C

[0055] Inflection point: P

[0056] Aperture: 100, 200, 300, 400, 500, 600, 700

[0057] Apertures: 101, 201, 501, 601, 701

[0058] First lens: 110, 210, 310, 410, 510, 610, 710

[0059] Object-side surfaces: 111, 211, 311, 411, 511, 611, 711

[0060] Side surfaces: 112, 212, 312, 412, 512, 612, 712

[0061] Second lens: 120, 220, 320, 420, 520, 620, 720

[0062] Object-side surfaces: 121, 221, 321, 421, 521, 621, 721

[0063] Side surfaces: 122, 222, 322, 422, 522, 622, 722

[0064] Third lens: 130, 230, 330, 430, 530, 630, 730

[0065] Object-side surfaces: 131, 231, 331, 431, 531, 631, 731

[0066] Image side surface: 132, 232, 332, 432, 532, 632, 732

[0067] Fourth lens: 140, 240, 340, 440, 540, 640, 740

[0068] Object-side surfaces: 141, 241, 341, 441, 541, 641, 741

[0069] Side surfaces: 142, 242, 342, 442, 542, 642, 742

[0070] Fifth lenses: 150, 250, 350, 450, 550, 650, 750

[0071] Object-side surfaces: 151, 251, 351, 451, 551, 651, 751

[0072] Side surfaces: 152, 252, 352, 452, 552, 652, 752

[0073] Sixth lens: 160, 260, 360, 460, 560, 660, 760

[0074] Object-side surfaces: 161, 261, 361, 461, 561, 661, 761

[0075] Image side surface: 162, 262, 362, 462, 562, 662, 762

[0076] Seventh lens: 170, 270, 370, 470, 570, 670, 770

[0077] Object-side surfaces: 171, 271, 371, 471, 571, 671, 771

[0078] Image side surface: 172, 272, 372, 472, 572, 672, 772

[0079] Filter elements: 180, 280, 380, 480, 580, 680, 780

[0080] Imaging planes: 190, 290, 390, 490, 590, 690, 790

[0081] Electronic image sensors: 195, 295, 395, 495, 595, 695, 795

[0082] Y11: Maximum effective radius of the object-side surface of the first lens

[0083] Y72: Maximum effective radius of the image-side surface of the seventh lens Detailed Implementation

[0084] The following detailed description of the features and advantages of the present invention in the embodiments is sufficient to enable those skilled in the art to understand the technical content of the present invention and to implement it accordingly. Based on the disclosure of this specification, the claims, and the accompanying drawings, those skilled in the art can easily understand the related objects and advantages of the present invention. The following embodiments are further detailed in illustrating the viewpoints of the present invention, but are not intended to limit the scope of the present invention in any way.

[0085] The camera lens contains seven lenses, which are arranged in the following order from the object side to the image side: first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens.

[0086] Each pair of adjacent lenses from the first to the seventh lens can have an air gap along the optical axis. That is, the first, second, third, fourth, fifth, sixth, and seventh lenses can be seven single, non-bonded lenses. Since the manufacturing process of bonded lenses is more complex than that of non-bonded lenses, especially since the bonding surfaces of the two lenses need to have highly precise curvature to achieve a high degree of fit, and during the bonding process, misalignment can cause axis-shift defects, affecting the overall optical imaging quality. Therefore, having an air gap along the optical axis between any two adjacent lenses from the first to the seventh lens effectively reduces the manufacturing complexity of camera lenses and avoids affecting the overall optical imaging quality due to poor fit of the bonded lenses.

[0087] The object-side surface of the first lens can be convex near the optical axis. This allows for a larger light-gathering range, thereby providing a sufficient viewing angle.

[0088] The fourth lens can have negative refractive power. This helps to correct chromatic aberration and other system aberrations.

[0089] The fifth lens can have negative refractive power. This helps to correct astigmatism in photographic lenses.

[0090] The object-side surface of the seventh lens is concave near the optical axis; this helps to create a camera lens configuration suitable for large apertures and reduces changes in the overall shape of the seventh lens. The seventh lens may have negative refractive power; this balances the refractive power distribution at the image-side end to reduce aberrations and helps to compress the back focal length to maintain the miniaturization of the camera lens. The object-side surface of the seventh lens may have at least one convex critical point off-axis; this reduces the angle of incidence of peripheral light rays at the imaging plane, thereby increasing the response efficiency of the electronic sensor.

[0091] Of all the lens surfaces of the first, second, third, fourth, fifth, sixth, and seventh lenses in a camera optical lens, at least one surface is aspherical and has at least one inflection point. This facilitates control of peripheral light, prevents stray light generated by excessive incident angles from affecting image quality, and helps suppress the angle of off-axis field of view incident on the imaging plane to maintain imaging illumination, further optimizing image quality. Preferably, of all the lens surfaces of the seven lenses, at least two surfaces may be aspherical and each may have at least one inflection point. More preferably, of all the lens surfaces of the seven lenses, at least three surfaces may be aspherical and each may have at least one inflection point. Please refer to... Figure 19 A schematic diagram of the inflection point P of the seventh lens according to the first embodiment of the present invention is shown. Figure 19 The inflection points of the object-side and image-side surfaces of the seventh lens are illustrated as an example. The object-side or image-side surfaces of the other lenses may also have inflection points.

[0092] Among all the lens surfaces of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens of the optical lens for imaging, at least one surface may have at least one critical point off-axis, and this at least one critical point may be a convex critical point; thereby, off-axis aberration can be corrected, and it helps to adjust the incident and exit angles of peripheral light rays, reduce surface reflection, and enhance the illuminance of peripheral light rays on the imaging surface, thereby avoiding the generation of vignetting and stray light. Preferably, among all the lens surfaces of the fifth lens, the sixth lens, and the seventh lens of the optical lens for imaging, at least one surface may have at least one critical point off-axis. More preferably, among all the lens surfaces of the sixth lens and the seventh lens of the optical lens for imaging, at least one surface may have at least one critical point off-axis. Please refer to Figure 19 Figure 4 shows a schematic diagram of the critical point C of the seventh lens in the first embodiment of the present invention. Figure 19 The convex critical point on the object side surface of the seventh lens is shown as an exemplary illustration, and the object side surface or the image side surface of the other lenses may also have critical points.

[0093] The distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, and the maximum imaging height of the optical lens for imaging is ImgH (i.e., half of the total length of the diagonal of the effective sensing area of the electronic photosensitive element), which satisfies the following condition: TL / ImgH < 1.75. Thereby, it helps to miniaturize the optical lens for imaging. Preferably, it may satisfy the following condition: TL / ImgH < 1.55. More preferably, it may satisfy the following condition: 0.50 < TL / ImgH < 1.60. Even more preferably, it may satisfy the following condition: 0.60 < TL / ImgH ≤ 1.50.

[0094] The focal length of the optical lens for imaging is f, and the entrance pupil diameter of the optical lens for imaging is EPD, which satisfies the following condition: f / EPD < 1.90. Thereby, the characteristics of a large aperture of the optical lens for imaging can be enhanced. Preferably, it may further satisfy the following condition: f / EPD ≤ 1.70.

[0095] The focal length of the optical lens for imaging is f, and the radius of curvature of the image side surface of the seventh lens is R14, which may satisfy the following condition: f / R14 ≤ 0. Thereby, in combination with the characteristic that the object side surface of the seventh lens is concave near the axis, it is beneficial for the optical lens for imaging to form a large aperture configuration.

[0096] The focal length of the optical lens for imaging is f, and the focal length of the second lens is f2, which may satisfy the following condition: f / f2 < 0.70. Thereby, it helps to configure the refractive power lenses in the optical lens for imaging, so as to balance the refractive power distribution of the optical lens for imaging under the configurations of a large aperture and a large viewing angle.

[0097] The thickness of the seventh lens on the optical axis is CT7, and the sum of the lens thicknesses of the seven lenses of the imaging optical lens on the optical axis is ΣCT, which can satisfy the following conditions: 1.00 < ΣCT / CT7 < 20.0. Thereby, it is possible to avoid an excessive thickness ratio between the center and the periphery of the lens due to the too thin center thickness of the seventh lens, thereby ensuring the manufacturing qualification rate of the lens. Preferably, it can further satisfy the following conditions: 1.00 < ΣCT / CT7 < 15.0.

[0098] The focal length of the imaging optical lens is f, and the radius of curvature of the image-side surface of the sixth lens is R12, which can satisfy the following conditions: 0 ≤ f / R12. Thereby, it is beneficial to adjust the shape and the refractive power strength configuration of the sixth lens, and the design flexibility of the imaging optical lens can be improved.

[0099] The focal length of the sixth lens is f6, and the focal length of the seventh lens is f7, which can satisfy the following conditions: -1.20 ≤ f6 / f7 < 2.00. Thereby, a better refractive power distribution between the sixth lens and the seventh lens can be provided, which helps to balance the quality between the center and the periphery of the image. Preferably, it can further satisfy the following conditions: -1.20 ≤ f6 / f7 < 0.90.

[0100] The thickness of the fourth lens on the optical axis is CT4, and the distance between the third lens and the fourth lens on the optical axis is T34, which can satisfy the following conditions: 0 < CT4 / T34 < 2.50. Thereby, it helps to have sufficient space between the lenses in the middle section of the imaging optical lens, so that the fourth lens and its adjacent lenses can be configured with appropriate lens shapes and refractive powers.

[0101] The focal length of the imaging optical lens is f, and the focal length of the fourth lens is f4, which can satisfy the following conditions: -10.0 < f4 / f ≤ 0. Thereby, it can be ensured that the lenses in the middle section of the imaging optical lens have sufficient negative refractive power to balance the positive refractive power of the object-side end lens, which helps to correct aberration.

[0102] The radius of curvature of the object-side surface of the first lens is R1, and the radius of curvature of the object-side surface of the seventh lens is R13, which can satisfy the following conditions: -8.0 < R13 / R1 < 0. Thereby, it helps the seventh lens to form a shape suitable for a large-aperture imaging lens and can slow down the change in the overall shape of the seventh lens. Preferably, it can satisfy the following conditions: -3.0 < R13 / R1 < 0. More preferably, it can further satisfy the following conditions: -1.0 < R13 / R1 < 0.

[0103] The distance from the object-side surface of the first lens to the imaging surface on the optical axis is TL, which can satisfy the following conditions: 3.0 [mm] < TL < 7.0 [mm]. Thereby, the miniaturization feature of the imaging optical lens can be enhanced.

[0104] Half of the maximum viewing angle in the optical lens for imaging is HFOV, which satisfies the following condition: 35.0 [degrees] < HFOV < 65.0 [degrees]. Thereby, a sufficient viewing angle can be provided in the structure of a large aperture.

[0105] Among all the spacing distances on the optical axis between every two adjacent lenses in the seven lenses of the optical lens for imaging, the spacing distance T67 between the sixth lens and the seventh lens on the optical axis can be the maximum value. That is to say, the spacing distance T67 between the sixth lens and the seventh lens on the optical axis can be greater than the spacing distance T12 between the first lens and the second lens on the optical axis, the spacing distance T23 between the second lens and the third lens on the optical axis, the spacing distance T34 between the third lens and the fourth lens on the optical axis, the spacing distance T45 between the fourth lens and the fifth lens on the optical axis, and the spacing distance T56 between the fifth lens and the sixth lens on the optical axis. Thereby, it helps the sixth lens and the seventh lens to correct peripheral images and enables sufficient spatial arrangement for each lens.

[0106] The focal length of the first lens is f1, and the focal length of the second lens is f2, which satisfies the following condition: f2 / f1 < 1.0. Thereby, it helps the positive refractive power arrangement at the object side end of the optical lens for imaging, which is conducive to balancing the refractive power distribution of the optical lens for imaging under the arrangements of a large aperture and a large viewing angle.

[0107] The focal length of the optical lens for imaging is f, and the focal length of the seventh lens is f7, which satisfies the following condition: f / f7 < -0.50. Thereby, it can ensure that the seventh lens has sufficient negative refractive power, which is conducive to moving the exit pupil position of the light towards the object side end and helps with the miniaturization of the optical lens for imaging. Preferably, it can further satisfy the following condition: f / f7 < -1.0.

[0108] The radius of curvature of the object side surface of the sixth lens is R11, and the radius of curvature of the image side surface of the sixth lens is R12, which satisfies the following condition: 0.10 < (R11 + R12) / (R11 - R12). Thereby, it is beneficial to adjust the shape of the sixth lens and the strength arrangement of the refractive power, and can avoid problems in image correction caused by excessive change in the refractive power of the lens at the image side end.

[0109] Among the first to seventh lenses of the optical lens for imaging, the number of lenses with an Abbe number less than 20 is V20, which satisfies the following condition: 2 ≤ V20. Thereby, it is beneficial to enhance the ability of the optical lens for imaging to eliminate chromatic aberration and can further improve the imaging quality of the peripheral and overall images.

[0110] Among the absolute values of the radii of curvature of all lens surfaces (i.e., the object-side surface of the first lens to the image-side surface of the seventh lens) of the optical lens for imaging of the present invention, the absolute value of the radius of curvature of the object-side surface of the seventh lens is the minimum value. Thereby, it helps with the configuration of a large aperture for the optical lens for imaging and can slow down the change in the overall shape of the seventh lens.

[0111] The maximum effective radius of the object-side surface of the first lens is Y11, and the maximum effective radius of the image-side surface of the seventh lens is Y72, which can satisfy the following condition: 0.10 < Y11 / Y72 < 0.60. Thereby, the size configuration of each lens is more suitable for miniaturized electronic devices, avoiding the problem that the lens space cannot be fully utilized due to the overly large size of the first lens, and avoiding the problem that the light incident amount is insufficient and the image is unclear due to the overly small size of the seventh lens.

[0112] The focal length of the optical lens for imaging is f, and the distance between the sixth lens and the seventh lens on the optical axis is T67, which can satisfy the following condition: f / T67 < 10.0. Thereby, it helps the sixth lens and the seventh lens correct peripheral images and enables sufficient space configuration for each lens.

[0113] The focal length of the optical lens for imaging is f, the entrance pupil diameter of the optical lens for imaging is EPD, the distance from the object-side surface of the first lens to the imaging surface on the optical axis is TL, and the maximum imaging height of the optical lens for imaging is ImgH, which can satisfy the following condition: 1.50 < f / EPD + TL / ImgH < 3.30. Thereby, it is beneficial for the optical lens for imaging to achieve a balance between miniaturization and a large aperture.

[0114] Each of the above technical features in the optical lens for imaging of the present invention can be combined and configured to achieve the corresponding effects.

[0115] In the optical lens for imaging disclosed by the present invention, the material of the lens can be glass or plastic. If the material of the lens is glass, the freedom of refractive power configuration of the optical lens for imaging can be increased, and the glass lens can be made by techniques such as grinding or molding. If the lens material is plastic, the production cost can be effectively reduced. In addition, an aspherical surface (ASP) can be provided on the lens surface, thereby obtaining more control variables to reduce aberration, reduce the number of lenses, and effectively reduce the total length of the optical lens for imaging of the present invention, and the aspherical surface can be made by methods such as plastic injection molding or molding of glass lenses.

[0116] In the optical lens for imaging disclosed by the present invention, if the lens surface is an aspherical surface, it means that all or a part of the optically effective area of the lens surface is an aspherical surface.

[0117] In the optical lens for imaging disclosed in this invention, if the lens surface is convex and the position of the convex surface is not defined, it means that the convex surface can be located near the optical axis of the lens surface; if the lens surface is concave and the position of the concave surface is not defined, it means that the concave surface can be located near the optical axis of the lens surface. If the refractive power or focal length of the lens is not defined in its region, it means that the refractive power or focal length of the lens can be the refractive power or focal length of the lens near the optical axis.

[0118] In the optical lens for imaging disclosed in this invention, the inflection point of the lens surface refers to the boundary point where the curvature of the lens surface changes from positive to negative. The critical point of the lens surface refers to the point of tangency on the tangent line between a plane perpendicular to the optical axis and the lens surface, and the critical point is not located on the optical axis.

[0119] In the camera optical lens disclosed in this invention, the imaging surface of the camera optical lens can be a plane or a curved surface with any curvature, depending on the corresponding electronic photosensitive element, especially a curved surface with the concave surface facing the object side.

[0120] In the optical lens for imaging disclosed in this invention, one or more imaging correction elements (such as planar elements) can be selectively disposed between the lens closest to the imaging plane and the imaging plane to achieve the effect of correcting image curvature (such as image distortion). The optical properties of the imaging correction element, such as curvature, thickness, refractive index, position, and surface type (convex or concave, spherical or aspherical, diffractive surface, and Fresnel surface, etc.), can be adjusted according to the requirements of the imaging device. Generally, a preferred configuration of the imaging correction element is to place a thin plano-concave element with a concave surface in the object-side direction close to the imaging plane.

[0121] The optical lens for imaging disclosed in this invention may be provided with at least one aperture stop, which may be located in front of the first lens, between the lenses, or after the last lens. The aperture stop may be of the type such as a glare stop or a field stop, which can be used to reduce stray light and help improve image quality.

[0122] In the optical lens for imaging disclosed in this invention, the aperture can be configured as a front aperture or a center aperture. A front aperture means the aperture is positioned between the subject and the first lens, while a center aperture means the aperture is positioned between the first lens and the imaging plane. A front aperture allows for a longer distance between the exit pupil and the imaging plane, resulting in a telecentric effect and increasing the efficiency of image reception by the CCD or CMOS sensor. A center aperture helps to expand the system's field of view.

[0123] This invention may appropriately incorporate a variable aperture element, which can be a mechanical component or a light-regulating element, and whose aperture size and shape can be controlled electrically or by electrical signals. The mechanical component may include movable parts such as a blade assembly or a shielding plate; the light-regulating element may include a filter element, an electrochromic material, a liquid crystal layer, or other shielding material. This variable aperture element can enhance image adjustment capabilities by controlling the amount of light entering the image or the exposure time. Furthermore, this variable aperture element can also be the aperture of this invention, and image quality, such as depth of field or exposure speed, can be adjusted by changing the F-value.

[0124] Based on the above implementation methods, specific embodiments are presented below and described in detail with reference to the accompanying drawings.

[0125] <First Embodiment>

[0126] Please refer to Figures 1 to 2 ,in Figure 1 A schematic diagram of an image-capturing device according to a first embodiment of the present invention is shown. Figure 2 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the first embodiment. Figure 1 As can be seen, the imaging device includes a camera optical lens (unlabeled) and an electronic image sensor 195. The camera optical lens, from the object side to the image side, sequentially includes an aperture 100, a first lens 110, a second lens 120, an aperture stop 101, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, a filter element 180, and an imaging plane 190. The electronic image sensor 195 is disposed on the imaging plane 190. The camera optical lens comprises seven single, non-bonded lenses (110, 120, 130, 140, 150, 160, 170), and there are no other interposed lenses between each lens. Each pair of adjacent lenses has an air gap along the optical axis.

[0127] The first lens 110 has positive refractive power and is made of plastic. Its object-side surface 111 is convex near the optical axis, and its image-side surface 112 is concave near the optical axis. Both of its surfaces are aspherical.

[0128] The second lens 120 has negative refractive power and is made of plastic. Its object-side surface 121 is convex near the optical axis, and its image-side surface 122 is concave near the optical axis. Both of its surfaces are aspherical.

[0129] The third lens 130 has positive refractive power and is made of plastic. Its object-side surface 131 is convex near the optical axis, and its image-side surface 132 is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface 131 has at least one critical point off-axis and at least one inflection point.

[0130] The fourth lens 140 has negative refractive power and is made of plastic. Its object-side surface 141 is convex near the optical axis, and its image-side surface 142 is concave near the optical axis. Both surfaces are aspherical. Both the object-side surface 141 and the image-side surface 142 have at least one critical point off-axis, and both the object-side surface 141 and the image-side surface 142 have at least one inflection point.

[0131] The fifth lens 150 has positive refractive power and is made of plastic. Its object-side surface 151 is convex near the optical axis, and its image-side surface 152 is convex near the optical axis. Both surfaces are aspherical. Its object-side surface 151 has at least one critical point off-axis, and both its object-side surface 151 and image-side surface 152 have at least one inflection point.

[0132] The sixth lens 160 has negative refractive power and is made of plastic. Its object-side surface 161 is concave near the optical axis, and its image-side surface 162 is concave near the optical axis. Both surfaces are aspherical. Both the object-side surface 161 and the image-side surface 162 have at least one critical point off-axis, and both the object-side surface 161 and the image-side surface 162 have at least one inflection point.

[0133] The seventh lens 170 has negative refractive power and is made of plastic. Its object-side surface 171 is concave near the optical axis, and its image-side surface 172 is convex near the optical axis. Both surfaces are aspherical. Both the object-side surface 171 and the image-side surface 172 have at least one critical point off-axis, and both the object-side surface 171 and the image-side surface 172 have at least one inflection point.

[0134] The filter element 180 is made of glass and is positioned between the seventh lens 170 and the imaging surface 190, without affecting the focal length of the camera lens.

[0135] The equations for the aspherical surfaces of the above lenses are expressed as follows:

[0136]

[0137] X: The distance between a point on the aspherical surface at a distance Y from the optical axis and the tangent plane at the intersection point of the aspherical surface and the optical axis.

[0138] Y: The perpendicular distance between a point on the aspherical curve and the optical axis;

[0139] R: Radius of curvature;

[0140] k: cone coefficient; and

[0141] Ai: The i-th order aspherical coefficient.

[0142] In the first embodiment of the camera optical lens, the focal length of the camera optical lens is f, the aperture value of the camera optical lens is Fno, and half of the maximum angle of view of the camera optical lens is HFOV, with the following values: f = 4.30 mm, Fno = 1.50, HFOV = 42.5 degrees. Furthermore, the entrance pupil diameter of the camera optical lens is EPD, and Fno is equivalent to f / EPD.

[0143] The distance on the optical axis from the object-side surface 111 of the first lens to the imaging plane 190 is TL, which satisfies the following condition: TL = 5.60 mm.

[0144] The number of lenses with an Abbe number less than 20 among the first to seventh lenses of the camera optical lens is V20, which satisfies the following condition: V20 = 2. Specifically, the Abbe numbers of the second lens 120 and the fourth lens 140 are both less than 20.

[0145] The focal length of the camera lens is f, the entrance pupil diameter of the camera lens is EPD, the distance on the optical axis from the object-side surface 111 of the first lens to the imaging plane 190 is TL, and the maximum imaging height of the camera lens is ImgH, which satisfies the following condition: (f / EPD)+(TL / ImgH)=2.90.

[0146] The thickness of the fourth lens 140 on the optical axis is CT4, and the distance between the third lens 130 and the fourth lens 140 on the optical axis is T34, which satisfies the following condition: CT4 / T34 = 0.87. In this embodiment, the distance between two adjacent lenses on the optical axis refers to the air gap between the two adjacent lenses on the optical axis.

[0147] The total thickness of the seven lenses in a camera lens along the optical axis is ΣCT, and the thickness of the seventh lens 170 along the optical axis is CT7, which satisfies the following condition: ΣCT / CT7=12.35.

[0148] The focal length of the camera lens is f, and the distance between the sixth lens 160 and the seventh lens 170 on the optical axis is T67, which satisfies the following condition: f / T67=30.26.

[0149] The distance on the optical axis from the object-side surface 111 of the first lens to the imaging plane 190 is TL, and the maximum imaging height of the imaging optical lens is ImgH, which satisfies the following condition: TL / ImgH=1.40.

[0150] The maximum effective radius of the object-side surface 111 of the first lens is Y11, and the maximum effective radius of the image-side surface 172 of the seventh lens is Y72, which satisfies the following condition: Y11 / Y72=0.36.

[0151] The radius of curvature of the object-side surface 161 of the sixth lens is R11, and the radius of curvature of the image-side surface 162 of the sixth lens is R12, which satisfies the following condition: (R11+R12) / (R11-R12)=0.12.

[0152] The radius of curvature of the object-side surface 111 of the first lens is R1, and the radius of curvature of the object-side surface 171 of the seventh lens is R13, which satisfies the following condition: R13 / R1=-3.37.

[0153] The focal length of the optical lens used for imaging is f, and the radius of curvature of the image-side surface 162 of the sixth lens is R12, which satisfies the following condition: f / R12=1.54.

[0154] The focal length of the optical lens used for imaging is f, and the radius of curvature of the image-side surface 172 of the seventh lens is R14, which satisfies the following condition: f / R14=-0.04.

[0155] The focal length of the first lens 110 is f1, and the focal length of the second lens 120 is f2, which satisfies the following condition: f2 / f1 = -2.66.

[0156] The focal length of the camera lens is f, and the focal length of the fourth lens 140 is f4, which satisfies the following condition: f4 / f = -6.06.

[0157] The sixth lens 160 has a focal length of f6, and the seventh lens 170 has a focal length of f7. They satisfy the following condition: f6 / f7 = 0.21.

[0158] The focal length of the camera lens is f, and the focal length of the second lens 120 is f2, which satisfies the following condition: f / f2=-0.37.

[0159] The focal length of the camera lens is f, and the focal length of the seventh lens 170 is f7. They satisfy the following condition: f / f7 = -0.33.

[0160] Please refer to Table 1 and Table 2 below.

[0161]

[0162]

[0163]

[0164] Table 1 is... Figure 1The first embodiment provides detailed structural data, where the units for radius of curvature, thickness, and focal length are millimeters (mm), and surfaces 0 to 19 sequentially represent surfaces from the object side to the image side. Table 2 shows the aspherical data in the first embodiment, where k is the cone coefficient in the aspherical curve equation, and A4 to A20 represent the 4th to 20th order aspherical coefficients of each surface. Furthermore, the tables for the following embodiments are corresponding schematic diagrams and aberration curves for each embodiment. The definitions of the data in the tables are the same as those in Tables 1 and 2 of the first embodiment, and will not be repeated here.

[0165] <Second Embodiment>

[0166] Please refer to Figures 3 to 4 ,in Figure 3 A schematic diagram of an image-capturing device according to a second embodiment of the present invention is shown. Figure 4 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the second embodiment. Figure 3 As can be seen, the imaging device includes a camera optical lens (unlabeled) and an electronic image sensor 295. The camera optical lens, from the object side to the image side, sequentially includes an aperture 200, a first lens 210, a second lens 220, an aperture stop 201, a third lens 230, a fourth lens 240, a fifth lens 250, a sixth lens 260, a seventh lens 270, a filter element 280, and an imaging plane 290. The electronic image sensor 295 is disposed on the imaging plane 290. The camera optical lens comprises seven single, non-bonded lenses (210, 220, 230, 240, 250, 260, 270), and there are no other interposed lenses between each lens. Each pair of adjacent lenses has an air gap along the optical axis.

[0167] The first lens 210 has positive refractive power and is made of plastic. Its object-side surface 211 is convex near the optical axis, and its image-side surface 212 is concave near the optical axis. Both surfaces are aspherical, and its image-side surface 212 has at least one inflection point.

[0168] The second lens 220 has negative refractive power and is made of plastic. Its object-side surface 221 is convex near the optical axis, and its image-side surface 222 is concave near the optical axis. Both of its surfaces are aspherical.

[0169] The third lens 230 has positive refractive power and is made of plastic. Its object-side surface 231 is convex near the optical axis, and its image-side surface 232 is concave near the optical axis. Both of its surfaces are aspherical. Its object-side surface 231 has at least one critical point off-axis, and both its object-side surface 231 and image-side surface 232 have at least one inflection point.

[0170] The fourth lens 240 has negative refractive power and is made of plastic. Its object-side surface 241 is concave near the optical axis, and its image-side surface 242 is concave near the optical axis. Both of its surfaces are aspherical. Its image-side surface 242 has at least one critical point off-axis, and both its object-side surface 241 and image-side surface 242 have at least one inflection point.

[0171] The fifth lens 250 has positive refractive power and is made of plastic. Its object-side surface 251 is concave near the optical axis, and its image-side surface 252 is convex near the optical axis. Both surfaces are aspherical, and both its object-side surface 251 and image-side surface 252 have at least one inflection point.

[0172] The sixth lens 260 has negative refractive power and is made of plastic. Its object-side surface 261 is concave near the optical axis, and its image-side surface 262 is concave near the optical axis. Both surfaces are aspherical. Both the object-side surface 261 and the image-side surface 262 have at least one critical point off-axis, and both the object-side surface 261 and the image-side surface 262 have at least one inflection point.

[0173] The seventh lens 270 has negative refractive power and is made of plastic. Its object-side surface 271 is concave near the optical axis, and its image-side surface 272 is flat near the optical axis. Both surfaces are aspherical. Both its object-side surface 271 and image-side surface 272 have at least one critical point off-axis, and both its object-side surface 271 and image-side surface 272 have at least one inflection point.

[0174] The filter element 280 is made of glass and is positioned between the seventh lens 270 and the imaging surface 290, without affecting the focal length of the camera lens.

[0175] Please refer to Table 3 and Table 4 below.

[0176]

[0177]

[0178]

[0179] In the second embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in the table below are the same as in the first embodiment and will not be repeated here.

[0180]

[0181] <Third Embodiment>

[0182] Please refer to Figures 5 to 6 ,in Figure 5 A schematic diagram of an image-capturing device according to a third embodiment of the present invention is shown. Figure 6 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the third embodiment. Figure 5 As can be seen, the imaging device includes a camera optical lens (unlabeled) and an electronic photosensitive element 395. The camera optical lens, from the object side to the image side, sequentially includes an aperture 300, a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, a sixth lens 360, a seventh lens 370, a filter element 380, and an imaging plane 390. The electronic photosensitive element 395 is disposed on the imaging plane 390. The camera optical lens comprises seven single, non-bonded lenses (310, 320, 330, 340, 350, 360, and 370), and there are no other interposed lenses between each lens. Each pair of adjacent lenses has an air gap along the optical axis.

[0183] The first lens 310 has positive refractive power and is made of plastic. Its object-side surface 311 is convex near the optical axis, and its image-side surface 312 is concave near the optical axis. Both surfaces are aspherical. Its image-side surface 312 has at least one critical point off-axis, and both its object-side surface 311 and image-side surface 312 have at least one inflection point.

[0184] The second lens 320 has negative refractive power and is made of plastic. Its object-side surface 321 is concave near the optical axis, and its image-side surface 322 is concave near the optical axis. Both surfaces are aspherical. Its object-side surface 321 has at least one critical point off-axis and at least one inflection point.

[0185] The third lens 330 has positive refractive power and is made of plastic. Its object-side surface 331 is flat near the optical axis, and its image-side surface 332 is convex near the optical axis. Both surfaces are aspherical, and its object-side surface 331 has at least one inflection point.

[0186] The fourth lens 340 has negative refractive power and is made of plastic. Its object-side surface 341 is concave near the optical axis, and its image-side surface 342 is convex near the optical axis. Both surfaces are aspherical, and its image-side surface 342 has at least one inflection point.

[0187] The fifth lens 350 has negative refractive power and is made of plastic. Its object-side surface 351 is concave near the optical axis, and its image-side surface 352 is convex near the optical axis. Both surfaces are aspherical, and both its object-side surface 351 and image-side surface 352 have at least one inflection point.

[0188] The sixth lens 360 has positive refractive power and is made of plastic. Its object-side surface 361 is convex near the optical axis, and its image-side surface 362 is concave near the optical axis. Both of its surfaces are aspherical. Both its object-side surface 361 and image-side surface 362 have at least one critical point off-axis, and both its object-side surface 361 and image-side surface 362 have at least one inflection point.

[0189] The seventh lens 370 has negative refractive power and is made of plastic. Its object-side surface 371 is concave near the optical axis, and its image-side surface 372 is convex near the optical axis. Both of its surfaces are aspherical. Its image-side surface 372 has at least one critical point off-axis, and both its object-side surface 371 and image-side surface 372 have at least one inflection point.

[0190] The filter element 380 is made of glass and is positioned between the seventh lens 370 and the imaging surface 390, without affecting the focal length of the camera lens.

[0191] Please refer to Table 5 and Table 6 below.

[0192]

[0193]

[0194]

[0195] In the third embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in the table below are the same as in the first embodiment and will not be repeated here.

[0196]

[0197] <Fourth Embodiment>

[0198] Please refer to Figures 7 to 8 ,in Figure 7 A schematic diagram of an image-capturing device according to a fourth embodiment of the present invention is shown. Figure 8 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the fourth embodiment. Figure 7As can be seen, the image capturing device includes a camera optical lens (unlabeled) and an electronic photosensitive element 495. The camera optical lens, from the object side to the image side, sequentially includes an aperture 400, a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, a sixth lens 460, a seventh lens 470, a filter element 480, and an imaging plane 490. The electronic photosensitive element 495 is disposed on the imaging plane 490. The camera optical lens comprises seven single, non-bonded lenses (410, 420, 430, 440, 450, 460, and 470), and there are no other interposed lenses between each lens. Each pair of adjacent lenses has an air gap along the optical axis.

[0199] The first lens 410 has positive refractive power and is made of glass. Its object-side surface 411 is convex near the optical axis, and its image-side surface 412 is convex near the optical axis. Both surfaces are aspherical. Its image-side surface 412 has at least one critical point off-axis, and both its object-side surface 411 and image-side surface 412 have at least one inflection point.

[0200] The second lens 420 has negative refractive power and is made of plastic. Its object-side surface 421 is flat near the optical axis, and its image-side surface 422 is concave near the optical axis. Both surfaces are aspherical. Its object-side surface 421 has at least one critical point off-axis and at least one inflection point.

[0201] The third lens 430 has positive refractive power and is made of plastic. Its object-side surface 431 is concave near the optical axis, and its image-side surface 432 is convex near the optical axis. Both of its surfaces are aspherical.

[0202] The fourth lens 440 has negative refractive power and is made of plastic. Its object-side surface 441 is concave near the optical axis, and its image-side surface 442 is convex near the optical axis. Both of its surfaces are aspherical. Its image-side surface 442 has at least one critical point off-axis and at least one inflection point.

[0203] The fifth lens 450 has negative refractive power and is made of plastic. Its object-side surface 451 is concave near the optical axis, and its image-side surface 452 is convex near the optical axis. Both surfaces are aspherical, and its image-side surface 452 has at least one inflection point.

[0204] The sixth lens 460 has positive refractive power and is made of plastic. Its object-side surface 461 is convex near the optical axis, and its image-side surface 462 is concave near the optical axis. Both surfaces are aspherical. Both the object-side surface 461 and the image-side surface 462 have at least one critical point off-axis, and both the object-side surface 461 and the image-side surface 462 have at least one inflection point.

[0205] The seventh lens 470 has negative refractive power and is made of plastic. Its object-side surface 471 is concave near the optical axis, and its image-side surface 472 is convex near the optical axis. Both surfaces are aspherical. Both the object-side surface 471 and the image-side surface 472 have at least one critical point off-axis, and both the object-side surface 471 and the image-side surface 472 have at least one inflection point.

[0206] The filter element 480 is made of glass and is positioned between the seventh lens 470 and the imaging surface 490, without affecting the focal length of the camera lens.

[0207] Please refer to Tables 7 and 8 below.

[0208]

[0209]

[0210]

[0211] In the fourth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in the table below are the same as in the first embodiment and will not be repeated here.

[0212]

[0213] <Fifth Embodiment>

[0214] Please refer to Figures 9 to 10 ,in Figure 9 A schematic diagram of an image-capturing device according to a fifth embodiment of the present invention is shown. Figure 10 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the fifth embodiment. Figure 9 As can be seen, the image capturing device includes a camera optical lens (unlabeled) and an electronic photosensitive element 595. The camera optical lens, from the object side to the image side, sequentially includes a first lens 510, an aperture 500, a second lens 520, a third lens 530, an aperture stop 501, a fourth lens 540, a fifth lens 550, a sixth lens 560, a seventh lens 570, a filter element 580, and an imaging surface 590. The electronic photosensitive element 595 is disposed on the imaging surface 590. The camera optical lens comprises seven single, non-bonded lenses (510, 520, 530, 540, 550, 560, and 570), and there are no other interposed lenses between each lens. Each pair of adjacent lenses has an air gap along the optical axis.

[0215] The first lens 510 has negative refractive power and is made of glass. Its object-side surface 511 is convex near the optical axis, and its image-side surface 512 is concave near the optical axis. Both surfaces are aspherical, and its object-side surface 511 has at least one inflection point.

[0216] The second lens 520 has positive refractive power and is made of plastic. Its object-side surface 521 is convex near the optical axis, and its image-side surface 522 is convex near the optical axis. Both surfaces are aspherical. Its image-side surface 522 has at least one critical point off-axis and at least one inflection point.

[0217] The third lens 530 has negative refractive power and is made of plastic. Its object-side surface 531 is convex near the optical axis, and its image-side surface 532 is concave near the optical axis. Both of its surfaces are aspherical.

[0218] The fourth lens 540 has positive refractive power and is made of plastic. Its object-side surface 541 is convex near the optical axis, and its image-side surface 542 is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface 541 has at least one critical point off-axis and at least one inflection point.

[0219] The fifth lens 550 has negative refractive power and is made of plastic. Its object-side surface 551 is convex near the optical axis, and its image-side surface 552 is concave near the optical axis. Both surfaces are aspherical. Both the object-side surface 551 and the image-side surface 552 have at least one critical point off-axis, and both the object-side surface 551 and the image-side surface 552 have at least one inflection point.

[0220] The sixth lens 560 has positive refractive power and is made of plastic. Its object-side surface 561 is convex near the optical axis, and its image-side surface 562 is convex near the optical axis. Both of its surfaces are aspherical. Its object-side surface 561 has at least one critical point off-axis, and both its object-side surface 561 and image-side surface 562 have at least one inflection point.

[0221] The seventh lens 570 has negative refractive power and is made of plastic. Its object-side surface 571 is concave near the optical axis, and its image-side surface 572 is convex near the optical axis. Both surfaces are aspherical. Both the object-side surface 571 and the image-side surface 572 have at least one convex critical point off-axis, and both the object-side surface 571 and the image-side surface 572 have at least one inflection point.

[0222] The filter element 580 is made of glass and is positioned between the seventh lens 570 and the imaging surface 590. It does not affect the focal length of the camera lens. Please refer to Tables 9 and 10 below.

[0223]

[0224]

[0225]

[0226] In the fifth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in the table below are the same as in the first embodiment and will not be repeated here.

[0227]

[0228] <Sixth Embodiment>

[0229] Please refer to Figures 11 to 12 ,in Figure 11 A schematic diagram of an image-capturing device according to a sixth embodiment of the present invention is shown. Figure 12 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the sixth embodiment. Figure 11 As can be seen, the image capturing device includes a camera optical lens (unlabeled) and an electronic photosensitive element 695. The camera optical lens, from the object side to the image side, sequentially includes a first lens 610, an aperture 600, a second lens 620, a third lens 630, an aperture stop 601, a fourth lens 640, a fifth lens 650, a sixth lens 660, a seventh lens 670, a filter element 680, and an imaging surface 690. The electronic photosensitive element 695 is disposed on the imaging surface 690. The camera optical lens comprises seven single, non-bonded lenses (610, 620, 630, 640, 650, 660, and 670), and there are no other interposed lenses between each lens. Each pair of adjacent lenses has an air gap along the optical axis.

[0230] The first lens 610 has positive refractive power and is made of plastic. Its object-side surface 611 is convex near the optical axis, and its image-side surface 612 is concave near the optical axis. Both surfaces are aspherical. Both the object-side surface 611 and the image-side surface 612 have at least one critical point off-axis, and both the object-side surface 611 and the image-side surface 612 have at least one inflection point.

[0231] The second lens 620 has positive refractive power and is made of plastic. Its object-side surface 621 is convex near the optical axis, and its image-side surface 622 is concave near the optical axis. Both surfaces are aspherical. Its image-side surface 622 has at least one critical point off-axis and at least one inflection point.

[0232] The third lens 630 has negative refractive power and is made of plastic. Its object-side surface 631 is convex near the optical axis, and its image-side surface 632 is concave near the optical axis. Both surfaces are aspherical, and its object-side surface 631 has at least one inflection point.

[0233] The fourth lens 640 has positive refractive power and is made of plastic. Its object-side surface 641 is concave near the optical axis, and its image-side surface 642 is convex near the optical axis. Both surfaces are aspherical, and both its object-side surface 641 and image-side surface 642 have at least one inflection point.

[0234] The fifth lens 650 has negative refractive power and is made of plastic. Its object-side surface 651 is concave near the optical axis, and its image-side surface 652 is concave near the optical axis. Both surfaces are aspherical, and its image-side surface 652 has at least one inflection point.

[0235] The sixth lens 660 has positive refractive power and is made of plastic. Its object-side surface 661 is concave near the optical axis, and its image-side surface 662 is convex near the optical axis. Both surfaces are aspherical, and its image-side surface 662 has at least one inflection point.

[0236] The seventh lens 670 has negative refractive power and is made of plastic. Its object-side surface 671 is concave near the optical axis, and its image-side surface 672 is convex near the optical axis. Both surfaces are aspherical. Both the object-side surface 671 and the image-side surface 672 have at least one convex critical point off-axis, and both the object-side surface 671 and the image-side surface 672 have at least one inflection point.

[0237] The filter element 680 is made of glass and is positioned between the seventh lens 670 and the imaging surface 690, without affecting the focal length of the camera lens.

[0238] Please refer to Table 11 and Table 12 below.

[0239]

[0240]

[0241]

[0242] In the sixth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in the table below are the same as in the first embodiment and will not be repeated here.

[0243]

[0244] <Seventh Embodiment>

[0245] Please refer to Figures 13 to 14 ,in Figure 13 A schematic diagram of an image-capturing device according to a seventh embodiment of the present invention is shown. Figure 14 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the seventh embodiment. Figure 13 As can be seen, the image capturing device includes a camera optical lens (unlabeled) and an electronic photosensitive element 795. The camera optical lens, from the object side to the image side, sequentially includes a first lens 710, an aperture 700, a second lens 720, a third lens 730, an aperture stop 701, a fourth lens 740, a fifth lens 750, a sixth lens 760, a seventh lens 770, a filter element 780, and an imaging surface 790. The electronic photosensitive element 795 is disposed on the imaging surface 790. The camera optical lens comprises seven single, non-bonded lenses (710, 720, 730, 740, 750, 760, and 770), and there are no other interposed lenses between each lens. Each pair of adjacent lenses has an air gap along the optical axis.

[0246] The first lens 710 has positive refractive power and is made of plastic. Its object-side surface 711 is convex near the optical axis, and its image-side surface 712 is concave near the optical axis. Both surfaces are aspherical. Both the object-side surface 711 and the image-side surface 712 have at least one critical point off-axis, and both the object-side surface 711 and the image-side surface 712 have at least one inversion point.

[0247] The second lens 720 has positive refractive power and is made of plastic. Its object-side surface 721 is convex near the optical axis, and its image-side surface 722 is convex near the optical axis. Both surfaces are aspherical. Its image-side surface 722 has at least one critical point off-axis and at least one inflection point.

[0248] The third lens 730 has negative refractive power and is made of plastic. Its object-side surface 731 is convex near the optical axis, and its image-side surface 732 is concave near the optical axis. Both surfaces are aspherical, and its object-side surface 731 has at least one inflection point.

[0249] The fourth lens 740 has negative refractive power and is made of plastic. Its object-side surface 741 is concave near the optical axis, and its image-side surface 742 is convex near the optical axis. Both surfaces are aspherical, and both the object-side surface 741 and the image-side surface 742 have at least one inflection point.

[0250] The fifth lens 750 has negative refractive power and is made of plastic. Its object-side surface 751 is convex near the optical axis, and its image-side surface 752 is concave near the optical axis. Both surfaces are aspherical. Both the object-side surface 751 and the image-side surface 752 have at least one critical point off-axis, and both the object-side surface 751 and the image-side surface 752 have at least one inflection point.

[0251] The sixth lens 760 has positive refractive power and is made of plastic. Its object-side surface 761 is convex near the optical axis, and its image-side surface 762 is convex near the optical axis. Both surfaces are aspherical. Its object-side surface 761 has at least one critical point off-axis, and both its object-side surface 761 and image-side surface 762 have at least one inflection point.

[0252] The seventh lens 770 has negative refractive power and is made of plastic. Its object-side surface 771 is concave near the optical axis, and its image-side surface 772 is convex near the optical axis. Both surfaces are aspherical. Both the object-side surface 771 and the image-side surface 772 have at least one convex critical point off-axis, and both the object-side surface 771 and the image-side surface 772 have at least one inflection point.

[0253] The filter element 780 is made of glass and is located between the seventh lens 770 and the imaging surface 790. It does not affect the focal length of the camera lens.

[0254] Please refer to Tables 13 and 14 below.

[0255]

[0256]

[0257]

[0258] In the seventh embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions in the table below are the same as in the first embodiment and will not be repeated here.

[0259]

[0260] <Eighth Embodiment>

[0261] Please refer to Figure 15 This diagram illustrates a perspective view of an image-capturing device according to an eighth embodiment of the present invention. In this embodiment, the image-capturing device 10 is a camera module. The image-capturing device 10 includes an imaging lens 11, a driving device 12, an electronic photosensitive element 13, and an image stabilization module 14. The imaging lens 11 includes the imaging lens group described in the first embodiment, a lens barrel (not otherwise labeled) for supporting the imaging lens group, and a support device (Holder Member, not otherwise labeled). The image-capturing device 10 uses the imaging lens 11 to focus light to generate an image, and cooperates with the driving device 12 to focus the image, finally imaging it onto the electronic photosensitive element 13 and outputting it as image data.

[0262] The driving device 12 may have an auto-focus function, and its driving method can use a driving system such as a voice coil motor (VCM), microelectromechanical systems (MEMS), piezoelectric systems, and shape memory alloys. The driving device 12 allows the imaging lens 11 to achieve a better imaging position, enabling clear images of the subject at different object distances. In addition, the image capturing device 10 is equipped with a high-brightness and low-noise electronic image sensor 13 (such as CMOS or CCD) located on the imaging surface of the camera lens group, which can truly present the good image quality of the camera lens group.

[0263] The image stabilization module 14 can be, for example, an accelerometer, a gyroscope, or a Hall effect sensor. The drive unit 12 can work in conjunction with the image stabilization module 14 to form an optical image stabilization (OIS) device. By adjusting the changes in different axes of the imaging lens 11, it can compensate for the blurry image caused by shaking during shooting, or use image compensation technology in the imaging software to provide electronic image stabilization (EIS) function, further improving the image quality of shooting in dynamic and low-light scenes.

[0264] <Ninth Embodiment>

[0265] Please refer to Figures 16 to 18 ,in Figure 16 A perspective view of one side of an electronic device according to a ninth embodiment of the present invention is shown. Figure 17 Draw Figure 16 A three-dimensional view of the other side of the electronic device. Figure 18 Draw Figure 16 System block diagram of an electronic device.

[0266] In this embodiment, the electronic device 20 is a smartphone. The electronic device 20 includes, according to the eighth embodiment, an image capturing device 10, an image capturing device 10a, an image capturing device 10b, a flash module 21, a focus assist module 22, an image signal processor 23, a user interface 24, and an image software processor 25. The image capturing devices 10, 10a, and 10b face the same direction and are all single-focus. Furthermore, the image capturing devices 10a and 10b have a similar structural configuration to the image capturing device 10. Specifically, each of the image capturing devices 10a and 10b includes an imaging lens, a driving device, an electronic photosensitive element, and an image stabilization module. The imaging lens of each of the image capturing devices 10a and 10b includes a lens group, a lens barrel for supporting the lens group, and a support device.

[0267] In this embodiment, the image capturing devices 10, 10a, and 10b have different viewing angles (wherein, image capturing device 10a can be a wide-angle device, image capturing device 10b can be a telephoto device, and the viewing angle of image capturing device 10 can be between that of image capturing device 10a and image capturing device 10b), enabling the electronic device to provide different magnifications to achieve an optical zoom shooting effect. The above-described electronic device 20 is exemplified by including multiple image capturing devices 10, 10a, and 10b, but the number of image capturing devices is not intended to limit the invention.

[0268] When the user photographs the subject 26, the electronic device 20 uses the image capturing device 10, image capturing device 10a, or image capturing device 10b to focus the light and activate the flash module 21 for supplemental lighting. It also uses the subject distance information provided by the focus assist module 22 for rapid focusing, and the image signal processor 23 performs image optimization processing to further improve the image quality produced by the camera lens. The focus assist module 22 can use an infrared or laser focus assist system to achieve rapid focusing. The user interface 24 can use a touch screen or a physical shooting button, combined with the diverse functions of the image software processor 25 for image capture and image processing. The image processed by the image software processor 25 can be displayed on the user interface 24.

[0269] The image capturing device 10 of the present invention is not limited to application in smartphones. The image capturing device 10 can also be applied to mobile focusing systems as needed, and features excellent aberration correction and good image quality. For example, the image capturing device 10 can be widely used in electronic devices such as three-dimensional (3D) image capture, digital cameras, mobile devices, tablet computers, smart TVs, network monitoring equipment, dashcams, reversing cameras, multi-lens devices, recognition systems, motion-sensing game consoles, and wearable devices. The above-mentioned electronic devices are merely illustrative examples of practical applications of the present invention and do not limit the scope of application of the image capturing device of the present invention.

[0270] Although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the appended claims.

Claims

1. An optical lens for photography, characterized in that, It comprises seven lenses, which are sequentially arranged from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. Each of the seven lenses has an object-side surface facing the object side and an image-side surface facing the image side. The first lens has positive refractive power, and its object-side surface is convex near the optical axis, while its image-side surface is concave near the optical axis. The second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has negative refractive power, the fifth lens has the opposite refractive power to the sixth lens, and the seventh lens has negative refractive power, with its object-side surface being concave near the optical axis. The camera optical lens comprises seven lenses with refractive power. At least one surface of each of these seven lenses is aspherical and has at least one inflection point. Each pair of adjacent lenses has an air gap along the optical axis. The distance between the sixth and seventh lenses along the optical axis is the maximum of all distances between adjacent lenses along the optical axis. The focal length of the camera optical lens is f. The radius of curvature of the image-side surface of the sixth lens is R12. The distance from the object-side surface of the first lens to an imaging plane along the optical axis is TL. The maximum imaging height of the camera optical lens is ImgH. The number of lenses with an Abbe number less than 20 among the seven lenses is V20. The maximum effective radius of the object-side surface of the first lens is Y11. The maximum effective radius of the image-side surface of the seventh lens is Y72. The entrance pupil diameter of the camera optical lens is EPD, which satisfies the following conditions: 0 < f / R12; TL / ImgH < 1.75; 2 ≤ V20； 0.10 < Y11 / Y72 < 0.60; and f / EPD < 1.

90.

2. The optical lens for imaging according to claim 1, characterized in that, The distance from the object-side surface of the first lens to the imaging plane along the optical axis is TL, the maximum imaging height of the imaging optical lens is ImgH, and half of the maximum field of view in the imaging optical lens is HFOV, which satisfies the following conditions: 0.50 < TL / ImgH < 1.55; and 35.0 degrees < HFOV < 65.0 degrees.

3. The optical lens for imaging according to claim 1, characterized in that, The radius of curvature of the object-side surface of the first lens is R1, and the radius of curvature of the object-side surface of the seventh lens is R13, which satisfy the following conditions: -3.0 < R13 / R1 < 0.

4. The optical lens for imaging according to claim 3, characterized in that, The radius of curvature of the object-side surface of the first lens is R1, and the radius of curvature of the object-side surface of the seventh lens is R13, which satisfy the following conditions: -1.0 < R13 / R1 < 0.

5. The optical lens for imaging according to claim 1, characterized in that, The object-side surface of the seventh lens has at least one convex critical point off-axis.

6. The optical lens for imaging according to claim 1, characterized in that, The absolute value of the radius of curvature of the object-side surface of the seventh lens is the minimum among all the absolute values ​​of the radius of curvature of the lens surfaces.

7. The optical lens for imaging according to claim 1, characterized in that, The focal length of the optical lens used for imaging is f, the entrance pupil diameter of the optical lens is EPD, the distance on the optical axis from the object-side surface of the first lens to the imaging plane is TL, and the maximum imaging height of the optical lens is ImgH. These conditions must be met: 1.50 < f / EPD+TL / ImgH < 3.

30.

8. The optical lens for imaging according to claim 1, characterized in that, The sum of the thicknesses of the seven lenses in the camera's optical lens along the optical axis is ΣCT, and the thickness of the seventh lens along the optical axis is CT7, which satisfies the following condition: 1.00 < ΣCT / CT7 < 15.

0.

9. The optical lens for imaging according to claim 1, characterized in that, The object-side surface of the sixth lens has a radius of curvature of R11, and the image-side surface of the sixth lens has a radius of curvature of R12, satisfying the following conditions: 0.10 < (R11+R12) / (R11-R12).

10. An optical lens for photography, characterized in that, It comprises seven lenses, which are sequentially arranged from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. Each of the seven lenses has an object-side surface facing the object side and an image-side surface facing the image side. The first lens has positive refractive power, and its object-side surface is convex near the optical axis, while its image-side surface is concave near the optical axis. The second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has negative refractive power, the fifth lens has the opposite refractive power to the sixth lens, and the seventh lens has negative refractive power, with its object-side surface being concave near the optical axis. The camera optical lens comprises seven refractive lenses. At least one surface of each of these seven lenses is aspherical and has at least one inflection point. Each pair of adjacent lenses has an air gap along the optical axis. The distance between the sixth and seventh lenses along the optical axis is the maximum of all distances between adjacent lenses. The focal length of the camera optical lens is f. The radius of curvature of the image-side surface of the sixth lens is R12. The distance from the object-side surface of the first lens to an imaging plane along the optical axis is TL. The maximum imaging height of the camera optical lens is ImgH. The number of lenses with an Abbe number less than 20 among the seven lenses is V20. The focal length of the sixth lens is f6, the focal length of the seventh lens is f7, and the entrance pupil diameter is EPD. The camera optical lens satisfies the following conditions: 0 < f / R12; TL / ImgH < 1.75; 2 ≤ V20； -1.20 ≤ f6 / f7 < 2.00; and f / EPD < 1.

90.

11. The optical lens for imaging according to claim 10, characterized in that, The distance from the object-side surface of the first lens to the imaging plane along the optical axis is TL, the maximum imaging height of the imaging optical lens is ImgH, and half of the maximum field of view in the imaging optical lens is HFOV, which satisfies the following conditions: 0.50 < TL / ImgH < 1.55; and 35.0 degrees < HFOV < 65.0 degrees.

12. The optical lens for imaging according to claim 10, characterized in that, The radius of curvature of the object-side surface of the first lens is R1, and the radius of curvature of the object-side surface of the seventh lens is R13, which satisfy the following conditions: -3.0 < R13 / R1 < 0.

13. The optical lens for imaging according to claim 12, characterized in that, The radius of curvature of the object-side surface of the first lens is R1, and the radius of curvature of the object-side surface of the seventh lens is R13, which satisfy the following conditions: -1.0 < R13 / R1 < 0.

14. The optical lens for imaging according to claim 10, characterized in that, The object-side surface of the seventh lens has at least one convex critical point off-axis.

15. The optical lens for imaging according to claim 10, characterized in that, The absolute value of the radius of curvature of the object-side surface of the seventh lens is the minimum among all the absolute values ​​of the radius of curvature of the lens surfaces.

16. The optical lens for imaging according to claim 10, characterized in that, The focal length of the optical lens used for imaging is f, the entrance pupil diameter of the optical lens is EPD, the distance on the optical axis from the object-side surface of the first lens to the imaging plane is TL, and the maximum imaging height of the optical lens is ImgH. These conditions must be met: 1.50 < f / EPD+TL / ImgH < 3.

30.

17. The optical lens for imaging according to claim 10, characterized in that, The sixth lens has a focal length of f6, and the seventh lens has a focal length of f7, satisfying the following conditions: -1.20 ≤ f6 / f7 < 0.

90.

18. The optical lens for imaging according to claim 10, characterized in that, The sum of the thicknesses of the seven lenses in the camera's optical lens along the optical axis is ΣCT, and the thickness of the seventh lens along the optical axis is CT7, which satisfies the following condition: 1.00 < ΣCT / CT7 < 15.

0.

19. The optical lens for imaging according to claim 10, characterized in that, The object-side surface of the sixth lens has a radius of curvature of R11, and the image-side surface of the sixth lens has a radius of curvature of R12, satisfying the following conditions: 0.10 < (R11+R12) / (R11-R12).

Images