Photographic lens group

Abstract

This invention discloses a photographic lens assembly. The photographic lens assembly 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. The third lens has positive refractive power. The image-side surface of the seventh lens is concave near the optical axis, and the image-side surface of the seventh lens includes at least one convex surface off-axis. At least one surface of the seven lenses is aspherical. Under certain conditions, this assembly helps to widen the viewing angle and shorten the overall length.

Description

[0001] This application is a divisional application of the patent application filed on February 6, 2018 (divisional filing date September 9, 2021), with application number 201810118955.5 (divisional application number 202111055556.7) and invention title "Photographic Lens Group, Image Capturing Device and Electronic Device". Technical Field

[0002] This invention relates to a photographic lens assembly, and more particularly to a photographic lens assembly for use in electronic devices that combines a wide angle of view with a short overall length. Background Technology

[0003] With advancements in semiconductor manufacturing technology, the performance of electronic image sensors has improved, and pixels can be made smaller. 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, and the requirements for optical lenses are becoming more diverse. Since traditional optical lenses are not easy to balance between requirements such as image quality, sensitivity, aperture size, size, or viewing angle, this invention provides an optical lens to meet these requirements. Summary of the Invention

[0005] The present invention provides a photographic lens group, wherein the photographic lens group has the characteristics of a large angle of view and a short overall length.

[0006] According to the present invention, a photographic lens assembly is provided, comprising 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. The second lens has positive refractive power. The third lens has positive refractive power. The fourth lens has negative refractive power. The fifth lens has positive refractive power. The sixth lens has negative refractive power. The seventh lens has negative refractive power, and its image-side surface near the optical axis is concave, and its image-side surface off-axis includes at least one convex surface. At least one surface of the seven lenses is aspherical. The total number of lenses in the photographic lens assembly is seven. The focal length of the first lens is f1, the focal length of the third lens is f3, the radius of curvature of the object-side surface of the first lens is R1, the radius of curvature of the image-side surface of the first lens is R2, the radius of curvature of the object-side surface of the third lens is R5, and the radius of curvature of the image-side surface of the third lens is R6, satisfying the following conditions:

[0007] |f3 / f1|<0.90;

[0008] 0.10 < (R5 + R6) / (R5 - R6) < 8.0; and

[0009] -1.0 < (R1 + R2) / (R1 - R2) < 1.80.

[0010] According to the present invention, a photographic lens assembly is provided, comprising 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. The object-side surface of the first lens is concave near the optical axis. The second lens has positive refractive power. The third lens has positive refractive power. The fourth lens has negative refractive power. The fifth lens has positive refractive power. The seventh lens has negative refractive power, its image-side surface is concave near the optical axis, and its image-side surface off-axis includes at least one convex surface. At least one surface of the seven lenses is aspherical. The total number of lenses in the photographic lens assembly is seven. The focal length of the first lens is f1, the focal length of the third lens is f3, the radius of curvature of the object-side surface of the third lens is R5, and the radius of curvature of the image-side surface of the third lens is R6, satisfying the following conditions:

[0011] |f3 / f1|<0.90; and

[0012] 0.10 < (R5 + R6) / (R5 - R6) < 8.0.

[0013] When |f3 / f1| meets the above conditions, the refractive power distribution of the first and third lenses can be effectively controlled to ensure that the photographic lens group can capture a wider range of images.

[0014] When (R5+R6) / (R5-R6) meets the above conditions, the symmetry of the photographic lens group can be improved to avoid generating too many aberrations.

[0015] When (R1+R2) / (R1-R2) satisfies the above conditions, the shape of the first lens can be effectively controlled to ensure that the angle of light incident on the lens surface is not too large and thus causes total internal reflection. Attached Figure Description

[0016] Figure 1 A schematic diagram of an image-capturing device according to a first embodiment of the present invention is shown.

[0017] Figure 2 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the first embodiment.

[0018] Figure 3 A schematic diagram of an image-capturing device according to a second embodiment of the present invention is shown;

[0019] Figure 4 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the second embodiment.

[0020] Figure 5 A schematic diagram of an image-capturing device according to a third embodiment of the present invention is shown;

[0021] Figure 6 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the third embodiment.

[0022] Figure 7 A schematic diagram of an image-capturing device according to a fourth embodiment of the present invention is shown;

[0023] Figure 8 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the fourth embodiment.

[0024] Figure 9 A schematic diagram of an image-capturing device according to a fifth embodiment of the present invention is shown;

[0025] Figure 10 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the fifth embodiment.

[0026] Figure 11 A schematic diagram of an image-capturing device according to a sixth embodiment of the present invention is shown;

[0027] Figure 12 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the sixth embodiment.

[0028] Figure 13 A schematic diagram of an image-capturing device according to a seventh embodiment of the present invention is shown;

[0029] Figure 14 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the seventh embodiment.

[0030] Figure 15 A schematic diagram of an imaging device according to an eighth embodiment of the present invention is shown;

[0031] Figure 16 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the eighth embodiment.

[0032] Figure 17 A schematic diagram of an image-capturing device according to a ninth embodiment of the present invention is shown;

[0033] Figure 18 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the ninth embodiment.

[0034] Figure 19 Drawing according to Figure 1 A schematic diagram of parameters Y11, Y21, Y31, Y41, Y51 and Y72 in the first embodiment;

[0035] Figure 20 Drawing according to Figure 1A schematic diagram of parameters Dsr3, Dsr4, Dsr5 and Dsr6 in the first embodiment;

[0036] Figure 21 Drawing according to Figure 1 A schematic diagram of parameters SAGc62 and Yc62 in the first embodiment;

[0037] Figure 22 Drawing according to Figure 1 A schematic diagram of parameter Yc72 in the first embodiment;

[0038] Figure 23 A perspective view of an imaging device according to a tenth embodiment of the present invention is shown.

[0039] Figure 24A A schematic diagram showing one side of an electronic device according to the eleventh embodiment of the present invention;

[0040] Figure 24B Drawing according to Figure 24A A schematic diagram of the other side of the electronic device;

[0041] Figure 24C Drawing according to Figure 24A A schematic diagram of the electronic device in the middle;

[0042] Figure 25 A schematic diagram illustrating an electronic device according to a twelfth embodiment of the present invention; and

[0043] Figure 26 A schematic diagram of an electronic device according to a thirteenth embodiment of the present invention is shown.

[0044] [Symbol Explanation]

[0045] Image capturing devices: 10, 10a, 10b, 31, 41

[0046] Imaging lenses: 11, 11a, 11b

[0047] Drive unit groups: 12, 12a, 12b

[0048] Image stabilization modules: 14, 14a, 14b

[0049] Electronic devices: 20, 30, 40

[0050] Flash module: 21

[0051] Focusing assist module: 22

[0052] Image signal processor: 23

[0053] User interface: 24

[0054] Image software processor: 25

[0055] Subject: 26

[0056] Aperture: 100, 200, 300, 400, 500, 600, 700, 800, 900

[0057] Apertures: 601, 602

[0058] First lens: 110, 210, 310, 410, 510, 610, 710, 810, 910; Object-side surface: 111, 211, 311, 411, 511, 611, 711, 811, 911; Image-side surface: 112, 212, 312, 412, 512, 612, 712, 812, 912

[0059] Second lens: 120, 220, 320, 420, 520, 620, 720, 820, 920; Object-side surface: 121, 221, 321, 421, 521, 621, 721, 821, 921; Image-side surface: 122, 222, 322, 422, 522, 622, 722, 822, 922

[0060] Third lens: 130, 230, 330, 430, 530, 630, 730, 830, 930; Object-side surface: 131, 231, 331, 431, 531, 631, 731, 831, 931; Image-side surface: 132, 232, 332, 432, 532, 632, 732, 832, 932

[0061] Fourth lens: 140, 240, 340, 440, 540, 640, 740, 840, 940; Object-side surface: 141, 241, 341, 441, 541, 641, 741, 841, 941; Image-side surface: 142, 242, 342, 442, 542, 642, 742, 842, 942

[0062] Fifth lens: 150, 250, 350, 450, 550, 650, 750, 850, 950; Object-side surface: 151, 251, 351, 451, 551, 651, 751, 851, 951; Image-side surface: 152, 252, 352, 452, 552, 652, 752, 852, 952

[0063] Sixth lens: 160, 260, 360, 460, 560, 660, 760, 860, 960; Object-side surface: 161, 261, 361, 461, 561, 661, 761, 861, 961; Image-side surface: 162, 262, 362, 462, 562, 662, 762, 862, 962

[0064] Seventh Lens: 170, 270, 370, 470, 570, 670, 770, 870, 970; Object-side Surface: 171, 271, 371, 471, 571, 671, 771, 871, 971; Image-side Surface: 172, 272, 372, 472, 572, 672, 772, 872, 972; Filter Element: 180, 280, 380, 480, 580, 680, 780, 880, 980; Imaging Surface: 190, 290, 390, 490, 590, 690, 790, 890, 990

[0065] Electronic photosensitive elements: 13, 13a, 13b, 195, 295, 395, 495, 595, 695, 795, 895, 995

[0066] f: Focal length of the camera lens group

[0067] Fno: Aperture value of the camera lens group

[0068] HFOV: Half of the maximum angle of view in the camera lens group.

[0069] Nmax: The maximum refractive index of all lenses in the photographic lens group.

[0070] CT4: Thickness of the fourth lens on the optical axis

[0071] CT5: Thickness of the fifth lens on the optical axis

[0072] R1: Radius of curvature of the object-side surface of the first lens

[0073] R2: Radius of curvature of the image-side surface of the first lens

[0074] R3: Radius of curvature of the object-side surface of the second lens

[0075] R4: Radius of curvature of the image-side surface of the second lens

[0076] R5: Radius of curvature of the object-side surface of the third lens

[0077] R6: Radius of curvature of the image-side surface of the third lens

[0078] R7: Radius of curvature of the object-side surface of the fourth lens

[0079] R8: Radius of curvature of the image-side surface of the fourth lens

[0080] R9: Radius of curvature of the object-side surface of the fifth lens

[0081] R10: Radius of curvature of the image-side surface of the fifth lens

[0082] R11: Radius of curvature of the object-side surface of the sixth lens

[0083] R12: Radius of curvature of the image-side surface of the sixth lens

[0084] R13: Radius of curvature of the object-side surface of the seventh lens

[0085] R14: Radius of curvature of the image-side surface of the seventh lens

[0086] Rf: Radius of curvature of the object-side surface of one of the lenses in a photographic lens group.

[0087] Rr: Radius of curvature of the image-side surface of the photographic lens group.

[0088] f1: Focal length of the first lens

[0089] f2: Focal length of the second lens

[0090] f3: Focal length of the third lens

[0091] f4: Focal length of the fourth lens

[0092] f5: Focal length of the fifth lens

[0093] f6: Focal length of the sixth lens

[0094] f7: Focal length of the seventh lens

[0095] f12: Combined focal length of the first and second lenses

[0096] fi: Focal length of the i-th lens

[0097] Y11: Maximum effective optical radius of the object-side surface of the first lens

[0098] Y21: Maximum effective optical radius of the object-side surface of the second lens

[0099] Y31: Maximum effective optical radius of the object-side surface of the third lens

[0100] Y41: Maximum effective optical radius of the object-side surface of the fourth lens

[0101] Y51: Maximum effective optical radius of the object-side surface of the fifth lens

[0102] Y72: Maximum effective optical radius of the image-side surface of the seventh lens

[0103] TL: Distance along the optical axis from the object-side surface of the first lens to the imaging plane.

[0104] ImgH: Maximum image height of the camera lens group

[0105] EPD: Entrance pupil diameter of the camera lens group

[0106] SD: Distance along the optical axis from the aperture to the image-side surface of the seventh lens.

[0107] TD: The distance on the optical axis from the object-side surface of the first lens to the image-side surface of the seventh lens.

[0108] Yc62: The perpendicular distance between a critical point off-axis on the image-side surface of the sixth lens and the optical axis.

[0109] Yc72: The perpendicular distance between a critical point off-axis on the image-side surface of the seventh lens and the optical axis.

[0110] SAGc62: The horizontal displacement along the optical axis from the intersection of the image-side surface of the sixth lens with the optical axis to a critical point on the off-axis of the image-side surface of the sixth lens.

[0111] Dsr3: Distance along the optical axis from the aperture to the object-side surface of the second lens.

[0112] Dsr4: Distance along the optical axis from the aperture to the image-side surface of the second lens.

[0113] Dsr5: Distance along the optical axis from the aperture to the object-side surface of the third lens.

[0114] Dsr6: Distance along the optical axis from the aperture to the image-side surface of the third lens. Detailed Implementation

[0115] A photographic lens assembly comprising seven lenses, which are arranged sequentially 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.

[0116] The first lens may have positive refractive power, thereby effectively dispersing the converging power of the object-side end of the photographic lens group to avoid excessive aberrations caused by excessive refractive power of a single lens. The image-side surface of the first lens may be convex near the optical axis, which can help improve the symmetry of the photographic lens group and reduce aberrations. In addition, at least one of the object-side and image-side surfaces of the first lens may contain at least one inflection point, which can help control the lens volume and effectively control the spherical aberration of the photographic lens group.

[0117] The object-side surface of the second lens can be convex near the optical axis, and its image-side surface can be concave near the optical axis. This allows the tangential and sagittal rays to converge, thereby correcting the astigmatism of the photographic lens group.

[0118] The third lens has positive refractive power, which can provide the main light-gathering ability of the photographic lens group, shortening its overall length to achieve device miniaturization.

[0119] The fourth lens can have negative refractive power, which can effectively correct the chromatic aberration of the photographic lens group to avoid image overlap caused by the shift in imaging position of different colored lights.

[0120] The fifth lens may have positive refractive power, providing converging capability at the image-side end of the photographic lens group to balance its aberrations. The object-side surface of the fifth lens may be concave near the optical axis, and its image-side surface may be convex near the optical axis. This ensures that light enters and exits the fifth lens surface at a gentler angle, avoiding stray light. At least one of the object-side and image-side surfaces of the fifth lens may include at least one inflection point, thereby enhancing the aberration correction capability of the fifth lens and improving image brightness and quality.

[0121] The image-side surface of the sixth lens may include at least one convex surface off-axis to prevent total internal reflection caused by an excessively large surface angle of the sixth lens, which would result in light spots in the image. At least one of the object-side and image-side surfaces of the sixth lens may include at least one inflection point, thereby mitigating the angle at which light rays exit the surface of the sixth lens and correcting distortion and image curvature.

[0122] The image-side surface of the seventh lens is concave near the optical axis, which effectively controls the back focal length of the photographic lens group, ensuring its miniaturization. Furthermore, the seventh lens can have negative refractive power, thereby balancing the refractive power configuration at the image-side end of the photographic lens group, correcting aberrations, and preventing excessive back focal length from leading to an overly large overall size. The off-axis portion of the image-side surface of the seventh lens may include at least one convex surface, which improves the Petzval field, effectively reducing lens size while maintaining good image quality, and preventing excessively large surface angles of the seventh lens from causing total internal reflection and resulting in image vignetting. At least one of the object-side and image-side surfaces of the seventh lens may include at least one inflection point, which effectively mitigates distortion and prevents vignetting at the image periphery.

[0123] At least one surface of the first to seventh lenses is aspherical, which can help correct off-axis aberrations, reduce the number of lens elements, and shorten the overall length. Alternatively, at least one surface of each of the first to seventh lenses can be aspherical, thereby correcting aberrations and compressing the overall length of the photographic lens group to achieve miniaturization.

[0124] Any two adjacent lenses among the first lens to the seventh lens may have a spacing distance on the optical axis. Thereby, the assembly complexity can be simplified and the manufacturing qualification rate can be improved. Specifically, the photographic lens group may have seven single non-bonded lenses. Since the process of bonding lenses is more complex than that of non-bonded lenses, especially when the bonding surfaces of two lenses need to have highly accurate curved surfaces to achieve a high degree of tightness when the two lenses are bonded, and during the bonding process, poor tightness may also be caused by misalignment, affecting the overall optical imaging quality. Therefore, in the photographic lens group of the present invention, any two adjacent lenses may have a spacing distance on the optical axis, which can effectively improve the problems caused by bonded lenses.

[0125] At least five lenses among the first lens to the seventh lens may be made of plastic material. Thereby, the weight of the lens can be reduced, and at the same time, the freedom of lens design can be increased to facilitate reducing the lens volume.

[0126] The focal length of the first lens is f1, and the focal length of the third lens is f3, which may satisfy the following condition: |f3 / f1| < 2.0. Thereby, the refractive power distribution of the first lens and the third lens can be effectively controlled to ensure that the photographic lens group can capture a wider image range. Preferably, it may satisfy the following condition: |f3 / f1| < 0.90. More preferably, it may satisfy the following condition: |f3 / f1| < 0.75. More preferably, it may satisfy the following condition: |f3 / f1| < 0.55. More preferably, it may satisfy the following condition: |f3 / f1| < 0.25.

[0127] The distance from the object side surface of the first lens to an imaging surface on the optical axis is TL, and the maximum image height of the photographic lens group is ImgH, which satisfies the following condition: 1.0 < TL / ImgH < 2.70. Thereby, miniaturization can be satisfied, and at the same time, there is sufficient light-receiving range, and vignetting of the image can be avoided. Preferably, it may satisfy the following condition: 1.0 < TL / ImgH < 2.0. More preferably, it may satisfy the following condition: 1.0 < TL / ImgH < 1.75.

[0128] The radius of curvature of the object side surface of the third lens is R5, and the radius of curvature of the image side surface of the third lens is R6, which may satisfy the following condition: -5.0 < (R5 + R6) / (R5 - R6). Thereby, the symmetry of the photographic lens group can be improved to avoid generating excessive aberrations. Preferably, it may satisfy the following condition: 0.1 < (R5 + R6) / (R5 - R6) < 8.0. More preferably, it may satisfy the following condition: 0.5 < (R5 + R6) / (R5 - R6) < 2.0. [[ID=?]] [[ID=?]]

[0129] The focal length of the first lens is f1, and the focal length of the fifth lens is f5, which can satisfy the following condition: |f5 / f1| < 0.70. Thus, the refractive power configuration of the first lens and the fifth lens can be balanced to enhance the light path control ability of the fifth lens, and further control the total length of the photographic lens group to achieve miniaturization. Preferably, it can satisfy the following condition: |f5 / f1| < 0.35.

[0130] The maximum value among the refractive indices of the lenses of the photographic lens group is Nmax, which can satisfy the following condition: 1.650 < Nmax < 1.750. Thus, the material configuration of the photographic lens group can be balanced to improve the imaging quality while compressing its total length to meet the characteristics of miniaturization.

[0131] Among the lenses of the photographic lens group, the Abbe number of at least two lenses can be less than 25.0. Due to the large density difference between the high-dispersion (i.e., low Abbe number) material and air, the light deflection ability is strong. Therefore, the same refractive effect can be achieved in a smaller space, which is beneficial for reducing the volume. Preferably, among the lenses of the photographic lens group, the Abbe number of at least two lenses can be less than 22.0.

[0132] The radius of curvature of the object side surface of the fourth lens is R7, and the radius of curvature of the image side surface of the fourth lens is R8, which can satisfy the following condition: -1.80 < (R7 + R8) / (R7 - R8) < 4.0. Thus, the surface shape of the fourth lens can be balanced, and the symmetry of the photographic lens group can be increased to maintain better imaging quality.

[0133] Half of the maximum viewing angle of the photographic lens group is HFOV, which can satisfy the following condition: 40.0 degrees < HFOV < 70.0 degrees. Thus, the viewing angle of the photographic lens group can be effectively controlled to have a larger image capture range and obtain more image information.

[0134] The photographic lens group may further include an aperture. The distance between the aperture and the object side surface of the second lens on the optical axis is Dsr3, the distance between the aperture and the image side surface of the second lens on the optical axis is Dsr4, the distance between the aperture and the object side surface of the third lens on the optical axis is Dsr5, and the distance between the aperture and the image side surface of the third lens on the optical axis is Dsr6, which can satisfy the following conditions: |Dsr4 / Dsr3| < 1.0; and |Dsr5 / Dsr6| < 1.0. Thus, the aperture position can be controlled to balance the viewing angle and the total length, which is beneficial for the miniaturization of the electronic device and increases the practicality at the same time.

[0135] The maximum optical effective radius of the object-side surface of the first lens is Y11, and the maximum optical effective radius of the image-side surface of the seventh lens is Y72, which can satisfy the following conditions: 0.50 < Y11 / Y72 < 1.0. Thereby, the opening sizes at the object end and the image end of the lens can be effectively controlled, the relative illumination can be improved, and at the same time, the symmetry of the photographic lens group can be enhanced to reduce the generation of aberrations.

[0136] The focal length of the photographic lens group is f, and the combined focal length of the first lens and the second lens is f12, which can satisfy the following conditions: -0.10 < f / f12 < 0.35. Thereby, the refractive power of the photographic lens group can be balanced to facilitate the simultaneous realization of wide-angle and miniaturization characteristics.

[0137] The horizontal displacement on the optical axis from the intersection point of the image-side surface of the sixth lens on the optical axis to a critical point off the axis of the image-side surface of the sixth lens is SAGc62, and the vertical distance from the critical point off the axis of the image-side surface of the sixth lens to the optical axis is Yc62. All critical points of the image-side surface of the sixth lens can satisfy the following conditions: |SAGc62 / Yc62| < 0.10. By controlling the surface shape of the image-side surface of the sixth lens, the lens curvature can be effectively controlled to avoid the lens occupying too much space and causing the lens volume to be too large, or the lens curvature being too large and difficult to form.

[0138] The focal length of the photographic lens group is f, and the entrance pupil diameter of the photographic lens group is EPD, which can satisfy the following conditions: 0.80 < f / EPD ≤ 2.30. Thereby, the light absorption amount of the photographic lens group can be increased to make the captured image clearer.

[0139] The vertical distance from a critical point off the axis of the image-side surface of the sixth lens to the optical axis is Yc62, and the vertical distance from a critical point off the axis of the image-side surface of the seventh lens to the optical axis is Yc72, which satisfy the following conditions: 0.10 < Yc62 / Yc72 < 1.50. Thereby, off-axis field aberration correction can be ensured and the image curvature of the photographic lens group can be optimized.

[0140] The focal length of the photographic lens group is f, the radius of curvature of the object-side surface of one of the lenses of the photographic lens group is Rf, and the radius of curvature of the image-side surface of the said lens of the photographic lens group is Rr. At least one of all the lenses (the first lens to the seventh lens) satisfies the following conditions: |f / Rf| + |f / Rr| < 0.50. Thereby, the lens surface curvature can be weakened to make it a correction lens to facilitate aberration correction. Preferably, it can satisfy the following conditions: |f / Rf| + |f / Rr| < 0.38.

[0141] The radius of curvature of the object-side surface of the first lens is R1, and the radius of curvature of the image-side surface of the first lens is R2, which can satisfy the following conditions: -1.80 < (R1 + R2) / (R1 - R2). Thus, the shape of the first lens can be effectively controlled to ensure that the angle of light incident on the lens surface is not too large to cause total reflection. Preferably, it can satisfy the following conditions: -1.0 < (R1 + R2) / (R1 - R2) < 8.0. More preferably, it can satisfy the following conditions: 0 < (R1 + R2) / (R1 - R2) < 6.0. More preferably, it can satisfy the following conditions: 0 < (R1 + R2) / (R1 - R2) < 2.50. More preferably, it can satisfy the following conditions: 0 < (R1 + R2) / (R1 - R2) < 1.80.

[0142] The maximum optical effective radius of the object-side surface of the first lens is Y11, the maximum optical effective radius of the object-side surface of the second lens is Y21, the maximum optical effective radius of the object-side surface of the third lens is Y31, the maximum optical effective radius of the object-side surface of the fourth lens is Y41, and the maximum optical effective radius of the object-side surface of the fifth lens is Y51, which can satisfy the following conditions: Y11 > Y21; Y11 > Y31; Y11 > Y41; and Y11 > Y51. Thus, the size of the lens can be effectively controlled to ensure that the first lens has sufficient area to receive a wide range of light, thereby enhancing the image brightness.

[0143] The focal length of the photographic lens group is f, and the focal length of the first lens is f1, which can satisfy the following conditions: -0.30 < f / f1 < 0.50. Thus, the refractive power configuration of the photographic lens group can be balanced to effectively reduce the sensitivity.

[0144] The thickness of the fourth lens on the optical axis is CT4, and the thickness of the fifth lens on the optical axis is CT5, which can satisfy the following conditions: 0.10 < CT4 / CT5 < 0.85. Thus, the central thickness of the fourth lens and the fifth lens can be balanced, and it can avoid deformation caused by the lens being too thin or uneven molding caused by the lens being too thick. More preferably, it can satisfy the following conditions: 0.10 < CT4 / CT5 < 0.65.

[0145] The photographic lens group may further include an aperture. The distance from the aperture to the image-side surface of the seventh lens on the optical axis is SD, and the distance from the object-side surface of the first lens to the image-side surface of the seventh lens on the optical axis is TD, which can satisfy the following conditions: 0.65 < SD / TD < 0.85. Thus, the relative position of the aperture in the photographic lens group can be balanced to facilitate the adjustment of the relationship between the viewing angle and the total length.

[0146] The focal length of the photographic lens group is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, the focal length of the seventh lens is f7, the focal length of the i-th lens is fi, and the minimum value of |f / fi| is |f / fi|min, which can satisfy the following conditions: |f / fi|min < 0.10, where i = 1 to 7. Thereby, the aberration correction ability of the photographic lens group can be improved to facilitate the balance of aberrations.

[0147] The focal length of the photographic lens group is f, and the maximum image height of the photographic lens group is ImgH, which can satisfy the following conditions: 0.65 < f / ImgH < 1.0. Thereby, the photographic range of the photographic lens group can be effectively controlled, the viewing angle can be expanded to meet a wider range of usage requirements.

[0148] The focal length of the photographic lens group is f, the focal length of the first lens is f1, and the focal length of the second lens is f2, which can satisfy the following conditions: |f / f1| + |f / f2| < 0.50. Thereby, it is possible to avoid excessive aberration caused by too large refractive power of a single lens, and at the same time, it is beneficial to improve the imaging quality. More preferably, it can satisfy the following conditions: |f / f1| + |f / f2| < 0.30.

[0149] Each of the technical features in the photographic lens group of the present invention described above can be combined and configured to achieve the corresponding effects.

[0150] In the photographic lens group disclosed in the present invention, the material of the lens can be glass or plastic. If the material of the lens is glass, the degree of freedom of refractive power configuration of the photographic lens group 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 aberrations, reduce the number of lenses, and effectively reduce the total length of the photographic lens group of the present invention. The aspherical surface can be made by methods such as plastic injection molding or molded glass lenses.

[0151] In the photographic lens group provided by the present invention, if the lens surface is an aspherical surface, it means that the entire or a part of the optically effective area of the lens surface is an aspherical surface.

[0152] Furthermore, in the photographic lens group provided by the present invention, if the lens surface is a convex surface and the position of the convex surface is not defined, it means that the lens surface can be convex near the optical axis; if the lens surface is a concave surface and the position of the concave surface is not defined, it means that the lens surface can be concave near the optical axis. In the photographic lens group provided by the present invention, if the lens has a positive refractive power or a negative refractive power, or the focal length of the lens, it can all refer to the refractive power or the focal length near the optical axis of the lens.

[0153] The imaging surface of the photographic lens group of the present invention can be a plane or a curved surface with any curvature, depending on the corresponding electronic photosensitive element, particularly a curved surface with a concave surface facing the object side. Furthermore, one or more imaging correction elements (such as planar elements) can be selectively arranged between the lens closest to the imaging surface and the imaging surface in the photographic lens group of the present invention to achieve the effect of correcting image curvature (e.g., image warping). The optical properties of the imaging correction element, such as curvature, thickness, refractive index, position, and surface shape (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 facing the object side near the imaging surface.

[0154] In addition, in the photographic lens group of the present invention, at least one aperture stop can be provided as needed. It can be located before the first lens, between each lens, or after the last lens. The type of aperture stop can be such as a glare stop or a field stop, etc., to reduce stray light and help improve image quality.

[0155] In the photographic lens group of the present invention, the aperture configuration can be a front aperture or a center aperture. A front aperture means that the aperture is set between the subject and the first lens, while a center aperture means that the aperture is set between the first lens and the imaging plane. If the aperture is a front aperture, a longer distance can be generated between the exit pupil of the photographic lens group and the imaging plane, giving it a telecentric effect and increasing the efficiency of image reception by the CCD or CMOS of the electronic image sensor. If the aperture is a center aperture, it helps to expand the field of view of the photographic lens group, giving it the advantages of a wide-angle lens.

[0156] In the photographic lens group of the present invention, the critical point is a point on the lens surface that is tangent to a tangent plane perpendicular to the optical axis, except for the intersection with the optical axis.

[0157] In the photographic lens group of the present invention, the inflection point is defined as the curve of the lens surface from near the optical axis to off the axis, where the center of curvature of the curve shifts from the object side to the image side (or from the image side to the object side).

[0158] The photographic lens group of the present invention can also be applied in various fields to electronic devices such as three-dimensional (3D) image capture, digital cameras, mobile products, digital tablets, smart TVs, network monitoring equipment, motion-sensing game consoles, dashcams, reversing cameras, wearable products, and drones.

[0159] This invention provides an image-capturing device comprising the aforementioned photographic lens group and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on an imaging surface of the photographic lens group. The photographic lens group features a wide angle of view and a short overall length. Preferably, the image-capturing device may further comprise a barrel member, a holder member, or a combination thereof.

[0160] This invention provides an electronic device comprising the aforementioned image-capturing device. This improves image quality. Furthermore, in addition to the aforementioned image-capturing device, the electronic device may further include a photographic lens group, the angle of view of which is smaller than that of the photographic lens group of the image-capturing device, and the two lens groups (i.e., the photographic lens group and the photographic lens group of the image-capturing device) can achieve a zoom effect via a processor connection. Preferably, the electronic device may further include a control unit, a display unit, a storage unit, random access memory (RAM), or a combination thereof.

[0161] Based on the above implementation methods, specific embodiments are presented below and described in detail with reference to the accompanying drawings.

[0162] <First Embodiment>

[0163] Please refer to Figure 1 and Figure 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 of the first embodiment includes a photographic lens group (not otherwise labeled) and an electronic photosensitive element 195. The photographic lens group includes, from the object side to the image side, a first lens 110, a second lens 120, an aperture 100, 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 surface 190. The electronic photosensitive element 195 is disposed on the imaging surface 190 of the photographic lens group. The photographic lens group includes seven lenses (110, 120, 130, 140, 150, 160, and 170). Any two adjacent lenses have a gap distance on the optical axis, and there are no other interposed lenses between the first lens 110 and the seventh lens 170.

[0164] 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 convex near the optical axis, both of which are aspherical. In addition, the object-side surface 111 of the first lens includes at least one inflection point.

[0165] 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 are aspherical.

[0166] The third lens 130 has positive refractive power and is made of plastic. Its object-side surface 131 is concave near the optical axis, and its image-side surface 132 is convex near the optical axis. Both are aspherical.

[0167] 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 are aspherical.

[0168] The fifth lens 150 has positive refractive power and is made of plastic. Its object-side surface 151 is concave near the optical axis, and its image-side surface 152 is convex near the optical axis, both of which are aspherical. In addition, both the object-side surface 151 and the image-side surface 152 of the fifth lens contain at least one inflection point.

[0169] 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 convex near the optical axis; both are aspherical. Furthermore, both the object-side surface 161 and the image-side surface 162 of the sixth lens contain at least one inflection point. The image-side surface 162 of the sixth lens contains at least one convex surface off-axis.

[0170] The seventh lens 170 has negative refractive power and is made of plastic. Its object-side surface 171 is convex near the optical axis, and its image-side surface 172 is concave near the optical axis; both are aspherical. Furthermore, both the object-side surface 171 and the image-side surface 172 of the seventh lens contain at least one inflection point. The image-side surface 172 of the seventh lens contains at least one convex surface off-axis.

[0171] 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 photographic lens group.

[0172] The equations for the aspherical surfaces of the above lenses are expressed as follows:

[0173]

[0174] in:

[0175] 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 on the optical axis of the aspherical surface;

[0176] Y: The perpendicular distance between a point on the aspherical curve and the optical axis;

[0177] R: Radius of curvature;

[0178] k: cone coefficient; and

[0179] Ai: The i-th order aspherical coefficient.

[0180] In the photographic lens group of the first embodiment, the focal length of the photographic lens group is f, the aperture value (f-number) of the photographic lens group is Fno, and half of the maximum angle of view in the photographic lens group is HFOV, with the following values: f = 3.16mm; Fno = 2.10; and HFOV = 48.5 degrees.

[0181] In the photographic lens group of the first embodiment, the maximum value of the refractive index of each lens (referring to the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, and the seventh lens 170) is Nmax (in the first embodiment, that is, the refractive index of the second lens 120), which satisfies the following condition: Nmax = 1.669.

[0182] In the photographic lens group of the first embodiment, the thickness of the fourth lens 140 on the optical axis is CT4, and the thickness of the fifth lens 150 on the optical axis is CT5, which satisfies the following condition: CT4 / CT5=0.33.

[0183] In the photographic lens group of the first embodiment, the radius of curvature of the object-side surface 111 of the first lens is R1, the radius of curvature of the image-side surface 112 of the first lens is R2, the radius of curvature of the object-side surface 131 of the third lens is R5, the radius of curvature of the image-side surface 132 of the third lens is R6, the radius of curvature of the object-side surface 141 of the fourth lens is R7, and the radius of curvature of the image-side surface 142 of the fourth lens is R8, which satisfy the following conditions: (R1+R2) / (R1-R2)=0.79; (R5+R6) / (R5-R6)=1.06; and (R7+R8) / (R7-R8)=3.19.

[0184] In the photographic lens group of the first embodiment, the focal length of the photographic lens group is f, the focal length of the first lens 110 is f1, the combined focal length of the first lens 110 and the second lens 120 is f12, the focal length of the second lens 120 is f2, the focal length of the third lens 130 is f3, and the focal length of the fifth lens 150 is f5, which satisfies the following conditions: f / f1=0.10; f / f12=0.08; |f3 / f1|=0.08; |f5 / f1|=0.07; and |f / f1|+|f / f2|=0.13.

[0185] In the photographic lens group of the first embodiment, the focal length of the photographic lens group is f, the focal length of the first lens 110 is f1, the focal length of the second lens 120 is f2, the focal length of the third lens 130 is f3, the focal length of the fourth lens 140 is f4, the focal length of the fifth lens 150 is f5, the focal length of the sixth lens 160 is f6, the focal length of the seventh lens 170 is f7, the focal length of the i-th lens is fi, and the minimum value of |f / fi| is |f / fi|min, which satisfies the following condition: |f / fi|min=0.03, where i=1~7 (|f / fi|min is the smallest absolute value of the ratio of the focal length f of the photographic lens group to the focal length of each lens, and in the first embodiment, |f / fi|min=|f / f2|).

[0186] Reference Figure 19 It is drawn according to Figure 1 A schematic diagram of parameters Y11, Y21, Y31, Y41, Y51 and Y72 in the first embodiment. In the photographic lens group of the first embodiment, the maximum effective optical radius of the object-side surface 111 of the first lens is Y11, and the maximum effective optical radius of the image-side surface 172 of the seventh lens is Y72, which satisfies the following condition: Y11 / Y72=0.69.

[0187] In the photographic lens group of the first embodiment, the distance from the object-side surface 111 of the first lens to the imaging surface 190 on the optical axis is TL, the maximum image height of the photographic lens group is ImgH (i.e., half the diagonal length of the effective sensing area of ​​the electronic photosensitive element 195), the focal length of the photographic lens group is f, and the entrance pupil diameter of the photographic lens group is EPD, which satisfies the following conditions: TL / ImgH = 1.58; f / ImgH = 0.86; and f / EPD = 2.10.

[0188] In the photographic lens group of the first embodiment, the distance from aperture 100 to the image-side surface 172 of the seventh lens on the optical axis is SD, and the distance from the object-side surface 111 of the first lens to the image-side surface 172 of the seventh lens on the optical axis is TD, which satisfies the following condition: SD / TD = 0.74.

[0189] Reference Figure 21 and Figure 22 , Figure 21 Drawing according to Figure 1 A schematic diagram of parameters SAGc62 and Yc62 in the first embodiment. Figure 22 Drawing according to Figure 1 The first embodiment shows a schematic diagram of parameter Yc72; the critical points and related parameters of other embodiments can be referred to in the same way. Figure 21 and Figure 22 The embodiments will not be illustrated separately. In the photographic lens group of the first embodiment, the image-side surface 162 of the sixth lens includes at least one critical point (see reference). Figure 21The image-side surface 172 of the seventh lens contains at least one critical point (see reference). Figure 22 The sixth lens has a critical point on its image-side surface 162 that is off-axis, with a perpendicular distance of Yc62 from the optical axis. The seventh lens has a critical point on its image-side surface 172 that is off-axis, with a perpendicular distance of Yc72 from the optical axis. These points satisfy the following conditions: Yc62 / Yc72 = 0.02 and 0.93 respectively. (The sixth lens's image-side surface 162 contains two critical points sequentially from the optical axis to the off-axis.) Figure 21 Only one critical point is shown.

[0190] Reference Figure 21 In the photographic lens group of the first embodiment, the horizontal displacement of the point where the image-side surface 162 of the sixth lens intersects the optical axis to a critical point on the off-axis of the image-side surface 162 of the sixth lens is SAGc62 (SAGc62 is defined as a negative value when the horizontal displacement is towards the object side; and as a positive value when the horizontal displacement is towards the image side). The vertical distance between the aforementioned critical point on the off-axis of the image-side surface 162 of the sixth lens and the optical axis is Yc62. All critical points on the image-side surface 162 of the sixth lens satisfy the following conditions: |SAGc62 / Yc62|=0.000, 0.082 (the image-side surface 162 of the sixth lens contains two critical points sequentially from the optical axis to the off-axis). Figure 21 Only one critical point is shown.

[0191] Reference Figure 20 Its drawing is based on Figure 1A schematic diagram of parameters Dsr3, Dsr4, Dsr5, and Dsr6 in the first embodiment. In the photographic lens group of the first embodiment, the distance between aperture 100 and the object-side surface 121 of the second lens on the optical axis is Dsr3 (if the center point of aperture 100 is closer to the object side than the point on the object-side surface 121 of the second lens on the optical axis, Dsr3 is a positive value; if the center point of aperture 100 is closer to the image side than the point on the object-side surface 121 of the second lens on the optical axis, Dsr3 is a negative value), and the distance between aperture 100 and the image-side surface 122 of the second lens on the optical axis is Dsr4 (if the center point of aperture 100 is closer to the object side than the point on the image-side surface 122 of the second lens on the optical axis, Dsr4 is a positive value; if the center point of aperture 100 is closer to the image side than the point on the image-side surface 122 of the second lens on the optical axis, Dsr4 is a negative value), and the distance between aperture 100 and the object-side surface 122 of the third lens is... The distance between aperture 100 and the image surface 132 of the third lens on the optical axis is Dsr5 (if the center point of aperture 100 is closer to the object side than the point on the object side of the third lens 131 on the optical axis, Dsr5 is a positive value; if the center point of aperture 100 is closer to the image side than the point on the object side of the third lens 131 on the optical axis, Dsr5 is a negative value), and the distance between aperture 100 and the image surface 132 of the third lens on the optical axis is Dsr6 (if the center point of aperture 100 is closer to the object side than the point on the image side of the third lens 132 on the optical axis, Dsr6 is a positive value; if the center point of aperture 100 is closer to the image side than the point on the image side of the third lens 132 on the optical axis, Dsr6 is a negative value), which satisfies the following conditions: |Dsr4 / Dsr3|=0.50; and |Dsr5 / Dsr6|=0.05.

[0192] In the photographic lens group of the first embodiment, the focal length of the photographic lens group is f, the radius of curvature of the object-side surface of one lens of the photographic lens group is Rf, and the radius of curvature of the image-side surface of the lens of the photographic lens group is Rr. The following table shows the values ​​of the condition |f / Rf|+|f / Rr| corresponding to the first lens 110 to the seventh lens 170, where the radius of curvature of the object-side surface 111 of the first lens is R1, the radius of curvature of the image-side surface 112 of the first lens is R2, the radius of curvature of the object-side surface 121 of the second lens is R3, the radius of curvature of the image-side surface 122 of the second lens is R4, and the radius of curvature of the object-side surface 122 of the third lens is R4. The radius of curvature of surface 131 is R5, the radius of curvature of the image-side surface 132 of the third lens is R6, the radius of curvature of the object-side surface 141 of the fourth lens is R7, the radius of curvature of the image-side surface 142 of the fourth lens is R8, the radius of curvature of the object-side surface 151 of the fifth lens is R9, the radius of curvature of the image-side surface 152 of the fifth lens is R10, the radius of curvature of the object-side surface 161 of the sixth lens is R11, the radius of curvature of the image-side surface 162 of the sixth lens is R12, the radius of curvature of the object-side surface 171 of the seventh lens is R13, and the radius of curvature of the image-side surface 172 of the seventh lens is R14.

[0193]

[0194] Please also refer to Table 1 and Table 2 below.

[0195]

[0196]

[0197] Table 1 is... Figure 1 The first embodiment provides detailed structural data, where the units for radius of curvature, thickness, and focal length are mm, and surfaces 0-18 sequentially represent surfaces from the object side to the image side. Table 2 shows the aspherical data in the first embodiment, where k represents the cone coefficient in the aspherical curve equation, and A4-A16 represent the 4th-16th 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.

[0198] In addition, in the photographic lens group of the first embodiment, the number of lenses with an Abbe number less than 25.0 among the first lens 110, second lens 120, third lens 130, fourth lens 140, fifth lens 150, sixth lens 160 and seventh lens 170 is two, namely the second lens 120 and the fourth lens 140.

[0199] Reference Figure 19 In the photographic lens group of the first embodiment, the maximum effective optical radius of the object-side surface 111 of the first lens is Y11, the maximum effective optical radius of the object-side surface 121 of the second lens is Y21, the maximum effective optical radius of the object-side surface 131 of the third lens is Y31, the maximum effective optical radius of the object-side surface 141 of the fourth lens is Y41, and the maximum effective optical radius of the object-side surface 151 of the fifth lens is Y51, which satisfy the following conditions: Y11>Y21; Y11>Y31; Y11>Y41; and Y11>Y51.

[0200] <Second Embodiment>

[0201] Please refer to Figure 3 and Figure 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 3As can be seen, the imaging device of the second embodiment includes a photographic lens group (not otherwise labeled) and an electronic photosensitive element 295. The photographic lens group includes, from the object side to the image side, a first lens 210, a second lens 220, an aperture 200, 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 surface 290. The electronic photosensitive element 295 is disposed on the imaging surface 290 of the photographic lens group. The photographic lens group includes seven lenses (210, 220, 230, 240, 250, 260, and 270). There is a gap between any two adjacent lenses on the optical axis, and there are no other interposed lenses between the first lens 210 and the seventh lens 270.

[0202] The first lens 210 has negative refractive power and is made of plastic. Its object-side surface 211 is concave near the optical axis, and its image-side surface 212 is convex near the optical axis, both of which are aspherical. In addition, both the object-side surface 211 and the image-side surface 212 of the first lens contain at least one inflection point.

[0203] The second lens 220 has positive 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 are aspherical.

[0204] The third lens 230 has positive refractive power and is made of plastic. Its object-side surface 231 is concave near the optical axis, and its image-side surface 232 is convex near the optical axis. Both are aspherical.

[0205] The fourth lens 240 has negative refractive power and is made of plastic. Its object-side surface 241 is convex near the optical axis, and its image-side surface 242 is concave near the optical axis. Both are aspherical.

[0206] 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 of which are aspherical. In addition, both the object-side surface 251 and the image-side surface 252 of the fifth lens contain at least one inflection point.

[0207] 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 convex near the optical axis; both are aspherical. Furthermore, both the object-side surface 261 and the image-side surface 262 of the sixth lens contain at least one inflection point. The image-side surface 262 of the sixth lens contains at least one convex surface off-axis.

[0208] The seventh lens 270 has negative refractive power and is made of plastic. Its object-side surface 271 is convex near the optical axis, and its image-side surface 272 is concave near the optical axis; both are aspherical. Furthermore, both the object-side surface 271 and the image-side surface 272 of the seventh lens contain at least one inflection point. The image-side surface 272 of the seventh lens contains at least one convex surface off-axis.

[0209] 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 photographic lens group.

[0210] Please also refer to Table 3 and Table 4 below.

[0211]

[0212]

[0213] In the second embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions of the parameters in the table below are the same as in the first embodiment, and will not be repeated here.

[0214] By referring to Tables 3 and 4, the following data can be calculated:

[0215]

[0216]

[0217] In the second embodiment of the photographic lens group, the focal length of the photographic lens group is f, the radius of curvature of the object-side surface of one of the lenses in the photographic lens group is Rf, and the radius of curvature of the image-side surface of the lens in the photographic lens group is Rr. The following table shows the values ​​of the condition |f / Rf|+|f / Rr| corresponding to the first lens 210 to the seventh lens 270. The surface parameters of each lens are defined as described in the first embodiment above, and will not be repeated here.

[0218]

[0219] In addition, in the photographic lens group of the second embodiment, the number of lenses with an Abbe number less than 25.0 among the first lens 210, second lens 220, third lens 230, fourth lens 240, fifth lens 250, sixth lens 260 and seventh lens 270 is two, namely the second lens 220 and the fourth lens 240.

[0220] In the photographic lens group of the second embodiment, the maximum effective optical radius of the object-side surface 211 of the first lens is Y11, the maximum effective optical radius of the object-side surface 221 of the second lens is Y21, the maximum effective optical radius of the object-side surface 231 of the third lens is Y31, the maximum effective optical radius of the object-side surface 241 of the fourth lens is Y41, and the maximum effective optical radius of the object-side surface 251 of the fifth lens is Y51, which satisfy the following conditions: Y11>Y21; Y11>Y31; Y11>Y41; and Y11>Y51.

[0221] <Third Embodiment>

[0222] Please refer to Figure 5 and Figure 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 of the third embodiment includes a photographic lens group (not otherwise labeled) and an electronic photosensitive element 395. The photographic lens group includes, from the object side to the image side, a first lens 310, a second lens 320, an aperture 300, 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 surface 390. The electronic photosensitive element 395 is disposed on the imaging surface 390 of the photographic lens group. The photographic lens group includes seven lenses (310, 320, 330, 340, 350, 360, and 370). Any two adjacent lenses have a gap distance on the optical axis, and there are no other interposed lenses between the first lens 310 and the seventh lens 370.

[0223] The first lens 310 has positive refractive power and is made of plastic. Its object-side surface 311 is concave near the optical axis, and its image-side surface 312 is convex near the optical axis, both of which are aspherical. In addition, the object-side surface 311 of the first lens includes at least one inflection point.

[0224] The second lens 320 has negative refractive power and is made of plastic. Its object-side surface 321 is convex near the optical axis, and its image-side surface 322 is concave near the optical axis. Both are aspherical.

[0225] The third lens 330 has positive refractive power and is made of glass. Its object-side surface 331 is convex near the optical axis, and its image-side surface 332 is convex near the optical axis. Both are aspherical.

[0226] The fourth lens 340 has negative refractive power and is made of plastic. Its object-side surface 341 is convex near the optical axis, and its image-side surface 342 is concave near the optical axis. Both are aspherical.

[0227] The fifth lens 350 has positive 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 of which are aspherical. In addition, both the object-side surface 351 and the image-side surface 352 of the fifth lens contain at least one inflection point.

[0228] The sixth lens 360 has negative refractive power and is made of plastic. Its object-side surface 361 is concave near the optical axis, and its image-side surface 362 is convex near the optical axis; both are aspherical. Furthermore, both the object-side surface 361 and the image-side surface 362 of the sixth lens contain at least one inflection point. The image-side surface 362 of the sixth lens contains at least one convex surface off-axis.

[0229] The seventh lens 370 has negative refractive power and is made of plastic. Its object-side surface 371 is convex near the optical axis, and its image-side surface 372 is concave near the optical axis; both are aspherical. Furthermore, both the object-side surface 371 and the image-side surface 372 of the seventh lens contain at least one inflection point. The image-side surface 372 of the seventh lens contains at least one convex surface off-axis.

[0230] 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 photographic lens group.

[0231] Please also refer to Table 5 and Table 6 below.

[0232]

[0233]

[0234] In the third embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions of the parameters in the table below are the same as in the first embodiment, and will not be repeated here.

[0235] By referring to Tables 5 and 6, the following data can be calculated:

[0236]

[0237] In the photographic lens group of the third embodiment, the focal length of the photographic lens group is f, the radius of curvature of the object-side surface of one of the lenses in the photographic lens group is Rf, and the radius of curvature of the image-side surface of the lens in the photographic lens group is Rr. The following table shows the values ​​of the condition |f / Rf|+|f / Rr| corresponding to the first lens 310 to the seventh lens 370. The surface parameters of each lens are defined as described in the first embodiment above, and will not be repeated here.

[0238]

[0239] In addition, in the photographic lens group of the third embodiment, the number of lenses with an Abbe number less than 25.0 among the first lens 310, second lens 320, third lens 330, fourth lens 340, fifth lens 350, sixth lens 360 and seventh lens 370 is three, namely the second lens 320, the fourth lens 340 and the sixth lens 360.

[0240] In the photographic lens group of the third embodiment, the maximum effective optical radius of the object-side surface 311 of the first lens is Y11, the maximum effective optical radius of the object-side surface 321 of the second lens is Y21, the maximum effective optical radius of the object-side surface 331 of the third lens is Y31, the maximum effective optical radius of the object-side surface 341 of the fourth lens is Y41, and the maximum effective optical radius of the object-side surface 351 of the fifth lens is Y51, which satisfy the following conditions: Y11>Y21; Y11>Y31; Y11>Y41; and Y11>Y51.

[0241] <Fourth Embodiment>

[0242] Please refer to Figure 7 and Figure 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 7 As can be seen, the imaging device of the fourth embodiment includes a photographic lens group (not otherwise labeled) and an electronic photosensitive element 495. The photographic lens group includes, from the object side to the image side, a first lens 410, a second lens 420, an aperture 400, 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 surface 490. The electronic photosensitive element 495 is disposed on the imaging surface 490 of the photographic lens group. The photographic lens group includes seven lenses (410, 420, 430, 440, 450, 460, and 470). There is a gap between any two adjacent lenses on the optical axis, and there are no other interposed lenses between the first lens 410 and the seventh lens 470.

[0243] The first lens 410 has positive refractive power and is made of plastic. Its object-side surface 411 is convex near the optical axis, and its image-side surface 412 is convex near the optical axis, both of which are aspherical. In addition, the object-side surface 411 of the first lens includes at least one inflection point.

[0244] The second lens 420 has positive refractive power and is made of plastic. Its object-side surface 421 is convex near the optical axis, and its image-side surface 422 is concave near the optical axis. Both are aspherical.

[0245] The third lens 430 has positive refractive power and is made of glass. Its object-side surface 431 is concave near the optical axis, and its image-side surface 432 is convex near the optical axis. Both are aspherical.

[0246] 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 concave near the optical axis. Both are aspherical.

[0247] The fifth lens 450 has positive 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 of which are aspherical. In addition, both the object-side surface 451 and the image-side surface 452 of the fifth lens contain at least one inflection point.

[0248] The sixth lens 460 has negative refractive power and is made of plastic. Its object-side surface 461 is concave near the optical axis, and its image-side surface 462 is convex near the optical axis; both are aspherical. Furthermore, both the object-side surface 461 and the image-side surface 462 of the sixth lens contain at least one inflection point. The image-side surface 462 of the sixth lens contains at least one convex surface off-axis.

[0249] The seventh lens 470 has negative refractive power and is made of plastic. Its object-side surface 471 is convex near the optical axis, and its image-side surface 472 is concave near the optical axis; both are aspherical. Furthermore, both the object-side surface 471 and the image-side surface 472 of the seventh lens contain at least one inflection point. The image-side surface 472 of the seventh lens contains at least one convex surface off-axis.

[0250] 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 photographic lens group.

[0251] Please also refer to Table 7 and Table 8 below.

[0252]

[0253]

[0254] In the fourth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions of the parameters in the table below are the same as in the first embodiment, and will not be repeated here.

[0255] By referring to Tables 7 and 8, the following data can be calculated:

[0256]

[0257] In the photographic lens group of the fourth embodiment, the focal length of the photographic lens group is f, the radius of curvature of the object-side surface of one of the lenses of the photographic lens group is Rf, and the radius of curvature of the image-side surface of the lens of the photographic lens group is Rr. The following table shows the values ​​of the condition |f / Rf|+|f / Rr| corresponding to the first lens 410 to the seventh lens 470. The surface parameters of each lens are defined as described in the first embodiment above, and will not be repeated here.

[0258]

[0259] In addition, in the photographic lens group of the fourth embodiment, the number of lenses with an Abbe number less than 25.0 among the first lens 410, the second lens 420, the third lens 430, the fourth lens 440, the fifth lens 450, the sixth lens 460, and the seventh lens 470 is three, namely the second lens 420, the fourth lens 440, and the sixth lens 460.

[0260] In the photographic lens group of the fourth embodiment, the maximum effective optical radius of the object-side surface 411 of the first lens is Y11, the maximum effective optical radius of the object-side surface 421 of the second lens is Y21, the maximum effective optical radius of the object-side surface 431 of the third lens is Y31, the maximum effective optical radius of the object-side surface 441 of the fourth lens is Y41, and the maximum effective optical radius of the object-side surface 451 of the fifth lens is Y51, which satisfy the following conditions: Y11>Y21; Y11>Y31; Y11>Y41; and Y11>Y51.

[0261] <Fifth Embodiment>

[0262] Please refer to Figure 9 and Figure 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 imaging device of the fifth embodiment includes a photographic lens group (not otherwise labeled) and an electronic photosensitive element 595. The photographic lens group includes, from the object side to the image side, a first lens 510, a second lens 520, an aperture 500, a third lens 530, 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 of the photographic lens group. The photographic lens group includes seven lenses (510, 520, 530, 540, 550, 560, and 570). Any two adjacent lenses have a gap distance on the optical axis, and there are no other interposed lenses between the first lens 510 and the seventh lens 570.

[0263] The first lens 510 has positive refractive power and is made of plastic. Its object-side surface 511 is convex near the optical axis, and its image-side surface 512 is convex near the optical axis, both of which are aspherical. In addition, both the object-side surface 511 and the image-side surface 512 of the first lens contain at least one inflection point.

[0264] The second lens 520 has negative 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 concave near the optical axis. Both are aspherical.

[0265] The third lens 530 has positive refractive power and is made of glass. Its object-side surface 531 is convex near the optical axis, and its image-side surface 532 is convex near the optical axis. Both are aspherical.

[0266] The fourth lens 540 has negative refractive power and is made of plastic. Its object-side surface 541 is concave near the optical axis, and its image-side surface 542 is concave near the optical axis. Both are aspherical.

[0267] The fifth lens 550 has positive refractive power and is made of plastic. Its object-side surface 551 is concave near the optical axis, and its image-side surface 552 is convex near the optical axis, both of which are aspherical. In addition, both the object-side surface 551 and the image-side surface 552 of the fifth lens contain at least one inflection point.

[0268] The sixth lens 560 has positive refractive power and is made of plastic. Its object-side surface 561 is concave near the optical axis, and its image-side surface 562 is convex near the optical axis; both are aspherical. Furthermore, both the object-side surface 561 and the image-side surface 562 of the sixth lens contain at least one inflection point. The image-side surface 562 of the sixth lens contains at least one convex surface off-axis.

[0269] The seventh lens 570 has negative refractive power and is made of plastic. Its object-side surface 571 is convex near the optical axis, and its image-side surface 572 is concave near the optical axis; both are aspherical. Furthermore, both the object-side surface 571 and the image-side surface 572 of the seventh lens contain at least one inflection point. The image-side surface 572 of the seventh lens contains at least one convex surface off-axis.

[0270] The filter element 580 is made of glass and is positioned between the seventh lens 570 and the imaging surface 590 without affecting the focal length of the photographic lens group.

[0271] Please also refer to Tables 9 and 10 below.

[0272]

[0273]

[0274] In the fifth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions of the parameters in the table below are the same as in the first embodiment, and will not be repeated here.

[0275] By referring to Tables 9 and 10, the following data can be calculated:

[0276]

[0277] In the photographic lens group of the fifth embodiment, the focal length of the photographic lens group is f, the radius of curvature of the object-side surface of one of the lenses of the photographic lens group is Rf, and the radius of curvature of the image-side surface of the lens of the photographic lens group is Rr. The following table shows the values ​​of the condition |f / Rf|+|f / Rr| corresponding to the first lens 510 to the seventh lens 570. The surface parameters of each lens are defined as described in the first embodiment above, and will not be repeated here.

[0278]

[0279] In addition, in the photographic lens group of the fifth embodiment, the number of lenses with an Abbe number less than 25.0 among the first lens 510, second lens 520, third lens 530, fourth lens 540, fifth lens 550, sixth lens 560 and seventh lens 570 is two, namely the second lens 520 and the fourth lens 540.

[0280] In the photographic lens group of the fifth embodiment, the maximum effective optical radius of the object-side surface 511 of the first lens is Y11, the maximum effective optical radius of the object-side surface 521 of the second lens is Y21, the maximum effective optical radius of the object-side surface 531 of the third lens is Y31, the maximum effective optical radius of the object-side surface 541 of the fourth lens is Y41, and the maximum effective optical radius of the object-side surface 551 of the fifth lens is Y51, which satisfy the following conditions: Y11>Y21; Y11>Y31; Y11>Y41; and Y11>Y51.

[0281] <Sixth Embodiment>

[0282] Please refer to Figure 11 and Figure 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 11As can be seen, the imaging device of the sixth embodiment includes a photographic lens group (not otherwise labeled) and an electronic photosensitive element 695. The photographic lens group, from the object side to the image side, includes, in sequence, an aperture stop 601, a first lens 610, a second lens 620, an aperture 600, a third lens 630, an aperture stop 602, 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 of the photographic lens group. The photographic lens group includes seven lenses (610, 620, 630, 640, 650, 660, and 670). There is a gap between any two adjacent lenses on the optical axis, and there are no other interposed lenses between the first lens 610 and the seventh lens 670.

[0283] The first lens 610 has positive refractive power and is made of plastic. Its object-side surface 611 is concave near the optical axis, and its image-side surface 612 is convex near the optical axis, both of which are aspherical. In addition, both the object-side surface 611 and the image-side surface 612 of the first lens contain at least one inflection point.

[0284] The second lens 620 has negative 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 are aspherical.

[0285] The third lens 630 has positive 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 convex near the optical axis. Both are aspherical.

[0286] The fourth lens 640 has negative refractive power and is made of plastic. Its object-side surface 641 is convex near the optical axis, and its image-side surface 642 is concave near the optical axis. Both are aspherical.

[0287] The fifth lens 650 has positive 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 convex near the optical axis, both of which are aspherical. In addition, both the object-side surface 651 and the image-side surface 652 of the fifth lens contain at least one inflection point.

[0288] The sixth lens 660 has negative 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 concave near the optical axis; both are aspherical. Furthermore, both the object-side surface 661 and the image-side surface 662 of the sixth lens contain at least one inflection point. The image-side surface 662 of the sixth lens contains at least one convex surface off-axis.

[0289] The seventh lens 670 has negative refractive power and is made of plastic. Its object-side surface 671 is convex near the optical axis, and its image-side surface 672 is concave near the optical axis; both are aspherical. Furthermore, both the object-side surface 671 and the image-side surface 672 of the seventh lens contain at least one inflection point. The image-side surface 672 of the seventh lens contains at least one convex surface off-axis.

[0290] 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 photographic lens group.

[0291] Please also refer to Table 11 and Table 12 below.

[0292]

[0293]

[0294] In the sixth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions of the parameters in the table below are the same as in the first embodiment, and will not be repeated here.

[0295] By referring to Tables 11 and 12, the following data can be calculated:

[0296]

[0297] In the sixth embodiment of the photographic lens group, the focal length of the photographic lens group is f, the radius of curvature of the object-side surface of one of the lenses in the photographic lens group is Rf, and the radius of curvature of the image-side surface of the lens in the photographic lens group is Rr. The following table shows the values ​​of the condition |f / Rf|+|f / Rr| corresponding to the first lens 610 to the seventh lens 670. The surface parameters of each lens are defined as described in the first embodiment above, and will not be repeated here.

[0298]

[0299] Furthermore, in the photographic lens group of the sixth embodiment, the number of lenses with an Abbe number less than 25.0 among the first lens 610, second lens 620, third lens 630, fourth lens 640, fifth lens 650, sixth lens 660 and seventh lens 670 is two, namely the second lens 620 and the fourth lens 640.

[0300] In the photographic lens group of the sixth embodiment, the maximum effective optical radius of the object-side surface 611 of the first lens is Y11, the maximum effective optical radius of the object-side surface 621 of the second lens is Y21, the maximum effective optical radius of the object-side surface 631 of the third lens is Y31, the maximum effective optical radius of the object-side surface 641 of the fourth lens is Y41, and the maximum effective optical radius of the object-side surface 651 of the fifth lens is Y51, which satisfy the following conditions: Y11>Y21; Y11>Y31; Y11>Y41; and Y11>Y51.

[0301] <Seventh Embodiment>

[0302] Please refer to Figure 13 and Figure 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 imaging device of the seventh embodiment includes a photographic lens group (not otherwise labeled) and an electronic photosensitive element 795. The photographic lens group includes, from the object side to the image side, a first lens 710, a second lens 720, an aperture 700, a third lens 730, 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 of the photographic lens group. The photographic lens group includes seven lenses (710, 720, 730, 740, 750, 760, and 770). There is a gap between any two adjacent lenses on the optical axis, and there are no other interposed lenses between the first lens 710 and the seventh lens 770.

[0303] 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 convex near the optical axis, both of which are aspherical. In addition, the object-side surface 711 of the first lens includes at least one inflection point.

[0304] 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 concave near the optical axis. Both are aspherical.

[0305] The third lens 730 has positive 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 convex near the optical axis. Both are aspherical.

[0306] 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 are aspherical.

[0307] The fifth lens 750 has positive refractive power and is made of plastic. Its object-side surface 751 is concave near the optical axis, and its image-side surface 752 is convex near the optical axis, both of which are aspherical. In addition, both the object-side surface 751 and the image-side surface 752 of the fifth lens contain at least one inflection point.

[0308] The sixth lens 760 has negative refractive power and is made of plastic. Its object-side surface 761 is concave near the optical axis, and its image-side surface 762 is convex near the optical axis; both are aspherical. Furthermore, both the object-side surface 761 and the image-side surface 762 of the sixth lens contain at least one inflection point. The image-side surface 762 of the sixth lens contains at least one convex surface off-axis.

[0309] The seventh lens 770 has negative refractive power and is made of plastic. Its object-side surface 771 is convex near the optical axis, and its image-side surface 772 is concave near the optical axis; both are aspherical. Furthermore, both the object-side surface 771 and the image-side surface 772 of the seventh lens contain at least one inflection point. The image-side surface 772 of the seventh lens contains at least one convex surface off-axis.

[0310] The filter element 780 is made of glass and is positioned between the seventh lens 770 and the imaging surface 790 without affecting the focal length of the photographic lens group.

[0311] Please also refer to Table 13 and Table 14 below.

[0312]

[0313]

[0314] In the seventh embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions of the parameters in the table below are the same as in the first embodiment, and will not be repeated here.

[0315] The following data can be calculated by referring to Tables 13 and 14:

[0316]

[0317]

[0318] In the photographic lens group of the seventh embodiment, the focal length of the photographic lens group is f, the radius of curvature of the object-side surface of one of the lenses of the photographic lens group is Rf, and the radius of curvature of the image-side surface of the lens of the photographic lens group is Rr. The following table shows the values ​​of the condition |f / Rf|+|f / Rr| corresponding to the first lens 710 to the seventh lens 770. The surface parameters of each lens are defined as described in the first embodiment above, and will not be repeated here.

[0319]

[0320] In addition, in the photographic lens group of the seventh embodiment, the number of lenses with an Abbe number less than 25.0 among the first lens 710, the second lens 720, the third lens 730, the fourth lens 740, the fifth lens 750, the sixth lens 760 and the seventh lens 770 are two, namely the second lens 720 and the fourth lens 740.

[0321] In the photographic lens group of the seventh embodiment, the maximum effective optical radius of the object-side surface 711 of the first lens is Y11, the maximum effective optical radius of the object-side surface 721 of the second lens is Y21, the maximum effective optical radius of the object-side surface 731 of the third lens is Y31, the maximum effective optical radius of the object-side surface 741 of the fourth lens is Y41, and the maximum effective optical radius of the object-side surface 751 of the fifth lens is Y51, which satisfy the following conditions: Y11>Y21; Y11>Y31; Y11>Y41; and Y11>Y51.

[0322] <Eighth Embodiment>

[0323] Please refer to Figure 15 and Figure 16 ,in Figure 15 A schematic diagram of an image-capturing device according to an eighth embodiment of the present invention is shown. Figure 16 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the eighth embodiment. Figure 15 As can be seen, the imaging device of the eighth embodiment includes a photographic lens group (not otherwise labeled) and an electronic photosensitive element 895. The photographic lens group includes, from the object side to the image side, a first lens 810, a second lens 820, an aperture 800, a third lens 830, a fourth lens 840, a fifth lens 850, a sixth lens 860, a seventh lens 870, a filter element 880, and an imaging surface 890. The electronic photosensitive element 895 is disposed on the imaging surface 890 of the photographic lens group. The photographic lens group includes seven lenses (810, 820, 830, 840, 850, 860, and 870). There is a gap between any two adjacent lenses on the optical axis, and there are no other interposed lenses between the first lens 810 and the seventh lens 870.

[0324] The first lens 810 has positive refractive power and is made of plastic. Its object-side surface 811 is convex near the optical axis, and its image-side surface 812 is convex near the optical axis, both of which are aspherical. In addition, the object-side surface 811 of the first lens includes at least one inflection point.

[0325] The second lens 820 has negative refractive power and is made of plastic. Its object-side surface 821 is convex near the optical axis, and its image-side surface 822 is concave near the optical axis. Both are aspherical.

[0326] The third lens 830 has positive refractive power and is made of plastic. Its object-side surface 831 is convex near the optical axis, and its image-side surface 832 is convex near the optical axis. Both are aspherical.

[0327] The fourth lens 840 has negative refractive power and is made of plastic. Its object-side surface 841 is concave near the optical axis, and its image-side surface 842 is convex near the optical axis. Both are aspherical.

[0328] The fifth lens 850 has positive refractive power and is made of plastic. Its object-side surface 851 is concave near the optical axis, and its image-side surface 852 is convex near the optical axis, both of which are aspherical. In addition, both the object-side surface 851 and the image-side surface 852 of the fifth lens contain at least one inflection point.

[0329] The sixth lens 860 has negative refractive power and is made of plastic. Its object-side surface 861 is convex near the optical axis, and its image-side surface 862 is concave near the optical axis; both are aspherical. Furthermore, both the object-side surface 861 and the image-side surface 862 of the sixth lens contain at least one inflection point. The image-side surface 862 of the sixth lens contains at least one convex surface off-axis.

[0330] The seventh lens 870 has negative refractive power and is made of plastic. Its object-side surface 871 is convex near the optical axis, and its image-side surface 872 is concave near the optical axis; both are aspherical. Furthermore, both the object-side surface 871 and the image-side surface 872 of the seventh lens contain at least one inflection point. The image-side surface 872 of the seventh lens contains at least one convex surface off-axis.

[0331] The filter element 880 is made of glass and is positioned between the seventh lens 870 and the imaging surface 890 without affecting the focal length of the photographic lens group.

[0332] Please also refer to Table 15 and Table 16 below.

[0333]

[0334]

[0335] In the eighth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions of the parameters in the table below are the same as in the first embodiment, and will not be repeated here.

[0336] By referring to Tables 15 and 16, the following data can be calculated:

[0337]

[0338]

[0339] In the photographic lens group of the eighth embodiment, the focal length of the photographic lens group is f, the radius of curvature of the object-side surface of one of the lenses of the photographic lens group is Rf, and the radius of curvature of the image-side surface of the lens of the photographic lens group is Rr. The following table shows the values ​​of the condition |f / Rf|+|f / Rr| corresponding to the first lens 810 to the seventh lens 870. The surface parameters of each lens are defined as described in the first embodiment above, and will not be repeated here.

[0340]

[0341] Furthermore, in the photographic lens group of the eighth embodiment, the number of lenses with an Abbe number less than 25.0 among the first lens 810, second lens 820, third lens 830, fourth lens 840, fifth lens 850, sixth lens 860 and seventh lens 870 is two, namely the second lens 820 and the fourth lens 840.

[0342] In the photographic lens group of the eighth embodiment, the maximum effective optical radius of the object-side surface 811 of the first lens is Y11, the maximum effective optical radius of the object-side surface 821 of the second lens is Y21, the maximum effective optical radius of the object-side surface 831 of the third lens is Y31, the maximum effective optical radius of the object-side surface 841 of the fourth lens is Y41, and the maximum effective optical radius of the object-side surface 851 of the fifth lens is Y51, which satisfy the following conditions: Y11>Y21; Y11>Y31; Y11>Y41; and Y11>Y51.

[0343] <Ninth Embodiment>

[0344] Please refer to Figure 17 and Figure 18 ,in Figure 17 A schematic diagram of an image-capturing device according to a ninth embodiment of the present invention is shown. Figure 18 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the ninth embodiment. Figure 17 As can be seen, the imaging device of the ninth embodiment includes a photographic lens group (not otherwise labeled) and an electronic photosensitive element 995. The photographic lens group includes, from the object side to the image side, a first lens 910, a second lens 920, an aperture 900, a third lens 930, a fourth lens 940, a fifth lens 950, a sixth lens 960, a seventh lens 970, a filter element 980, and an imaging surface 990. The electronic photosensitive element 995 is disposed on the imaging surface 990 of the photographic lens group. The photographic lens group includes seven lenses (910, 920, 930, 940, 950, 960, and 970). Any two adjacent lenses have a gap distance on the optical axis, and there are no other interposed lenses between the first lens 910 and the seventh lens 970.

[0345] The first lens 910 has positive refractive power and is made of plastic. Its object-side surface 911 is convex near the optical axis, and its image-side surface 912 is concave near the optical axis, both of which are aspherical. In addition, both the object-side surface 911 and the image-side surface 912 of the first lens contain at least one inflection point.

[0346] The second lens 920 has negative refractive power and is made of plastic. Its object-side surface 921 is convex near the optical axis, and its image-side surface 922 is concave near the optical axis. Both are aspherical.

[0347] The third lens 930 has positive refractive power and is made of plastic. Its object-side surface 931 is concave near the optical axis, and its image-side surface 932 is convex near the optical axis. Both are aspherical.

[0348] The fourth lens 940 has negative refractive power and is made of plastic. Its object-side surface 941 is convex near the optical axis, and its image-side surface 942 is concave near the optical axis. Both are aspherical.

[0349] The fifth lens 950 has positive refractive power and is made of plastic. Its object-side surface 951 is concave near the optical axis, and its image-side surface 952 is convex near the optical axis, both of which are aspherical. In addition, both the object-side surface 951 and the image-side surface 952 of the fifth lens contain at least one inflection point.

[0350] The sixth lens 960 has negative refractive power and is made of plastic. Its object-side surface 961 is concave near the optical axis, and its image-side surface 962 is also concave near the optical axis; both are aspherical. Furthermore, both the object-side surface 961 and the image-side surface 962 of the sixth lens contain at least one inflection point. The image-side surface 962 of the sixth lens contains at least one convex surface off-axis.

[0351] The seventh lens 970 has negative refractive power and is made of plastic. Its object-side surface 971 is convex near the optical axis, and its image-side surface 972 is concave near the optical axis; both are aspherical. Furthermore, both the object-side surface 971 and the image-side surface 972 of the seventh lens contain at least one inflection point. The image-side surface 972 of the seventh lens contains at least one convex surface off-axis.

[0352] The filter element 980 is made of glass and is positioned between the seventh lens 970 and the imaging surface 990 without affecting the focal length of the photographic lens group.

[0353] Please also refer to Table 17 and Table 18 below.

[0354]

[0355]

[0356] In the ninth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions of the parameters in the table below are the same as in the first embodiment, and will not be repeated here.

[0357] By referring to Tables 17 and 18, the following data can be calculated:

[0358]

[0359]

[0360] In the photographic lens group of the ninth embodiment, the focal length of the photographic lens group is f, the radius of curvature of the object-side surface of one of the lenses of the photographic lens group is Rf, and the radius of curvature of the image-side surface of the lens of the photographic lens group is Rr. The following table shows the values ​​of the condition |f / Rf|+|f / Rr| corresponding to the first lens 910 to the seventh lens 970. The surface parameters of each lens are defined as described in the first embodiment above, and will not be repeated here.

[0361]

[0362] Furthermore, in the photographic lens group of the ninth embodiment, the number of lenses with an Abbe number less than 25.0 among the first lens 910, second lens 920, third lens 930, fourth lens 940, fifth lens 950, sixth lens 960 and seventh lens 970 is two, namely the second lens 920 and the fourth lens 940.

[0363] In the photographic lens group of the ninth embodiment, the maximum effective optical radius of the object-side surface 911 of the first lens is Y11, the maximum effective optical radius of the object-side surface 921 of the second lens is Y21, the maximum effective optical radius of the object-side surface 931 of the third lens is Y31, the maximum effective optical radius of the object-side surface 941 of the fourth lens is Y41, and the maximum effective optical radius of the object-side surface 951 of the fifth lens is Y51, which satisfy the following conditions: Y11>Y21; Y11>Y31; Y11>Y41; and Y11>Y51.

[0364] <Tenth Embodiment>

[0365] Figure 23 A perspective view of an image-capturing device 10 according to a tenth embodiment of the present invention is shown. Figure 23As can be seen, the image capturing device 10 of the tenth embodiment is a camera module. The image capturing device 10 includes an imaging lens 11, a driving device assembly 12, and an electronic photosensitive element 13. The imaging lens 11 includes a photographic lens assembly of the first embodiment of the present invention and a lens barrel (not otherwise labeled) that carries the photographic lens assembly. The image capturing device 10 uses the imaging lens 11 to focus light and capture an image of the subject, and works with the driving device assembly 12 to focus the image. Finally, the image is captured on the electronic photosensitive element 13, and the image data is output.

[0366] The drive unit assembly 12 can be an auto-focus module, and its driving method can use drive systems such as voice coil motors (VCM), microelectromechanical systems (MEMS), piezoelectric systems, and shape memory alloys. The drive unit assembly 12 enables the photographic lens group to achieve a better imaging position, allowing for clear images of the subject at different object distances.

[0367] The image capturing device 10 can be equipped with an electronic image sensor 13 (such as CMOS or CCD) with high sensitivity and low noise, which is placed on the imaging surface of the photographic lens group, so as to truly present the good imaging quality of the photographic lens group.

[0368] Furthermore, the image capturing device 10 may include an image stabilization module 14, which may be a kinetic energy sensing element such as an accelerometer, gyroscope, or Hall effect sensor. In the tenth embodiment, the image stabilization module 14 is a gyroscope, but it is not limited thereto. By adjusting the changes in different axes of the photographic lens group to compensate for the blurry image caused by shaking during shooting, the imaging quality of shooting in dynamic and low-light scenes is further improved, and advanced image compensation functions such as optical image stabilization (OIS) and electronic image stabilization (EIS) are provided.

[0369] <Eleventh Embodiment>

[0370] Please refer to Figure 24A , Figure 24B and Figure 24C ,in Figure 24A A schematic diagram showing one side of an electronic device 20 according to the eleventh embodiment of the present invention is shown. Figure 24B Drawing according to Figure 24A A schematic diagram of the other side of the electronic device 20. Figure 24C Drawing according to Figure 24AA system schematic diagram of the electronic device 20. Figure 24A , Figure 24B and Figure 24C As can be seen, the electronic device 20 in the eleventh embodiment is a smartphone. The electronic device 20 includes an image capturing device 10a, an image capturing device 10b, a flash module 21, a focus assist module 22, an image signal processor 23 (ISP), a user interface 24, and an image software processor 25. The image capturing device 10a is a camera module, which includes an imaging lens 11a, a driving device group 12a, an electronic photosensitive element 13a, and an image stabilization module 14a. The image capturing device 10a in the eleventh embodiment can be the same as the image capturing device 10 in the tenth embodiment, and will not be described again here. The image capturing device 10b is a camera module, comprising an imaging lens 11b, a driving device assembly 12b, an electronic photosensitive element 13b, and an image stabilization module 14b. The imaging lens 11b includes a photographic lens group and a lens barrel (not otherwise labeled) supporting the photographic lens group. The photographic lens group may be the same as or different from the photographic lens group of this invention. The driving device assembly 12b, the electronic photosensitive element 13b, and the image stabilization module 14b may be the same as or different from the driving device assembly 12, the electronic photosensitive element 13, and the image stabilization module 14 in the tenth embodiment, which will not be elaborated further here. When the user takes a picture of the subject 26 through the user interface 24, the electronic device 20 uses the image capturing device 10a and / or the image capturing device 10b to focus the light, activates the flash module 21 for supplemental lighting, and uses the subject distance information provided by the focus assist module 22 for fast focusing. Furthermore, the image signal processor 23 and the image software processor 25 perform image optimization processing to further improve the image quality produced by the photographic lens group. The focusing assist module 22 can use an infrared or laser focusing assist system to achieve fast focusing, and the user interface 24 can use a touch screen or a physical shooting button, combined with the diverse functions of the image processing software for image shooting and image processing.

[0371] <Twelfth Embodiment>

[0372] Please refer to Figure 25 This is a schematic diagram illustrating an electronic device 30 according to the twelfth embodiment of the present invention. The electronic device 30 of the twelfth embodiment is a tablet computer, and the electronic device 30 includes an image-capturing device 31, wherein the image-capturing device 31 may be the same as that described in the tenth embodiment above, and will not be described again here.

[0373] <Thirteenth Embodiment>

[0374] Please refer to Figure 26This is a schematic diagram illustrating an electronic device 40 according to a thirteenth embodiment of the present invention. The electronic device 40 of the thirteenth embodiment is a wearable device, and the electronic device 40 includes an image-capturing device 41, wherein the image-capturing device 41 may be the same as that described in the tenth embodiment above, and will not be described again here.

[0375] Although the present invention has been disclosed above by way of 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. A photographic lens assembly, characterized in that, It includes seven lenses, which are, in order from the object side to the image side: A first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; Among them, the second lens has a positive refractive power; the third lens has a positive refractive power; the fourth lens has a negative refractive power; the fifth lens has a positive refractive power; the sixth lens has a negative refractive power; the seventh lens has a negative refractive power, and its image-side surface near the optical axis is concave, and the image-side surface of the seventh lens away from the axis includes at least one convex surface; at least one surface of the seven lenses is an aspherical surface; Among them, the total number of lenses in the photographic lens group is seven. The focal length of the first lens is f1, the focal length of the third lens is f3, the radius of curvature of the object-side surface of the first lens is R1, the radius of curvature of the image-side surface of the first lens is R2, the radius of curvature of the object-side surface of the third lens is R5, and the radius of curvature of the image-side surface of the third lens is R6, which satisfy the following conditions: |f3 / f1| < 0.90; 0.10 < (R5 + R6) / (R5 - R6) < 8.0; and -1.0 < (R1 + R2) / (R1 - R2) < 1.

80.

2. The photographic lens group according to claim 1, characterized in that, The object-side surface of the second lens near the optical axis is convex, and the image-side surface of the second lens near the optical axis is concave.

3. The photographic lens group according to claim 1, characterized in that, The focal length of the first lens is f1, the focal length of the third lens is f3, the radius of curvature of the object-side surface of the third lens is R5, the radius of curvature of the image-side surface of the third lens is R6, the radius of curvature of the object-side surface of the first lens is R1, and the radius of curvature of the image-side surface of the first lens is R2, which satisfy the following conditions: |f3 / f1| < 0.75; 0.79 ≤ (R5 + R6) / (R5 - R6) ≤ 1.05; and -1.0 < (R1 + R2) / (R1 - R2) ≤ 0.

76.

4. The photographic lens group according to claim 1, characterized in that, Half of the maximum viewing angle of the photographic lens group is HFOV. The distance from the object-side surface of the first lens to the imaging surface on the optical axis is TL. The maximum image height of the photographic lens group is ImgH. The maximum optical effective radius of the object-side surface of the first lens is Y11. The maximum optical effective radius of the image-side surface of the seventh lens is Y72, which satisfy the following conditions: 40.0 degrees < HFOV < 70.0 degrees; 1.57 ≤ TL / ImgH < 1.75; and 0.50 < Y11 / Y72 ≤ (原文此处应为0.69,按照要求保留)0.

69.

5. The photographic lens group according to claim 1, characterized in that, The perpendicular distance from a critical point away from the axis on the image-side surface of the sixth lens to the optical axis is Yc62. The perpendicular distance from a critical point away from the axis on the image-side surface of the seventh lens to the optical axis is Yc72, which satisfy the following conditions: 0.10 < Yc62 / Yc72 < 1.

50.

6. The photographic lens group according to claim 1, characterized in that, The focal length of the photographic lens group is f. The focal length of the first lens is f1. The focal length of the second lens is f2, which satisfy the following conditions: |f / f1| + |f / f2| < 0.

50.

7. The photographic lens group according to claim 1, characterized in that, The maximum optically effective radius of the object-side surface of the first lens is Y11, the maximum optically effective radius of the object-side surface of the second lens is Y21, the maximum optically effective radius of the object-side surface of the third lens is Y31, the maximum optically effective radius of the object-side surface of the fourth lens is Y41, and the maximum optically effective radius of the object-side surface of the fifth lens is Y51, which satisfy the following conditions: Y11 > Y21; Y11 > Y31; Y11 > Y41; and Y11 > Y51.

8. The photographic lens group according to claim 1, characterized in that, Among the seven lenses of the photographic lens group, the Abbe number of at least two lenses is less than 25.

0. The focal length of the photographic lens group is f, and the entrance pupil diameter of the photographic lens group is EPD, which satisfy the following conditions: 0.80 < f / EPD ≤ 2.

30.

9. A photographic lens assembly, characterized in that, Comprising seven lenses, the seven lenses are, in order from the object side to the image side: A first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; Wherein, the object-side surface of the first lens is concave near the optical axis; the second lens has a positive refractive power; the third lens has a positive refractive power; the fourth lens has a negative refractive power; the fifth lens has a positive refractive power; the seventh lens has a negative refractive power, and its image-side surface is concave near the optical axis, and at least one convex surface is included at the off-axis portion of the image-side surface of the seventh lens; at least one surface of the seven lenses is an aspherical surface; Wherein, the total number of lenses in the photographic lens group is seven. The focal length of the first lens is f1, the focal length of the third lens is f3, the radius of curvature of the object-side surface of the third lens is R5, and the radius of curvature of the image-side surface of the third lens is R6, which satisfy the following conditions: |f3 / f1| < 0.90; and 0.10 < (R5 + R6) / (R5 - R6) < 8.

0.

10. The photographic lens group according to claim 9, characterized in that, The first lens has a negative refractive power.

11. The photographic lens group according to claim 9, characterized in that, The object-side surface of the second lens is convex near the optical axis, and the image-side surface of the second lens is concave near the optical axis.

12. The photographic lens group according to claim 9, characterized in that, The maximum value of the refractive index of each lens in the photographic lens group is Nmax, which satisfies the following conditions: 1.650 < Nmax < 1.

750.

13. The photographic lens group according to claim 9, characterized in that, Half of the maximum viewing angle of the photographic lens group is HFOV. The distance from the object-side surface of the first lens to the imaging surface on the optical axis is TL. The maximum image height of the photographic lens group is ImgH. The maximum optically effective radius of the object-side surface of the first lens is Y11, and the maximum optically effective radius of the image-side surface of the seventh lens is Y72, which satisfy the following conditions: 40.0 degrees < HFOV < 70.0 degrees; 1.0 < TL / ImgH < 2.0; and 0.50 < Y11 / Y72 < 1.

0.

14. The photographic lens group according to claim 9, characterized in that, The perpendicular distance from a critical point at the off-axis portion of the image-side surface of the sixth lens to the optical axis is Yc62, and the perpendicular distance from a critical point at the off-axis portion of the image-side surface of the seventh lens to the optical axis is Yc72, which satisfy the following conditions: 0.10 < Yc62 / Yc72 < 1.

50.

15. The photographic lens group according to claim 9, characterized in that, The maximum effective optical radius of the object-side surface of the first lens is Y11, the maximum effective optical radius of the object-side surface of the second lens is Y21, the maximum effective optical radius of the object-side surface of the third lens is Y31, the maximum effective optical radius of the object-side surface of the fourth lens is Y41, and the maximum effective optical radius of the object-side surface of the fifth lens is Y51, which satisfies the following conditions: Y11>Y21; Y11>Y31; Y11>Y41; and Y11>Y51.

16. The photographic lens group according to claim 9, characterized in that, The first lens has a focal length of f1, the third lens has a focal length of f3, the object-side surface of the third lens has a radius of curvature of R5, the image-side surface of the third lens has a radius of curvature of R6, the object-side surface of the first lens has a radius of curvature of R1, and the image-side surface of the first lens has a radius of curvature of R2. These conditions must be met: |f3 / f1|<0.55; 0.50 < (R5 + R6) / (R5 - R6) < 2.0; and 0 < (R1 + R2) / (R1 - R2) < 1.

80.

17. The photographic lens group according to claim 9, characterized in that, The first lens has a focal length of f1, the third lens has a focal length of f3, the object-side surface of the third lens has a radius of curvature of R5, and the image-side surface of the third lens has a radius of curvature of R6, satisfying the following conditions: |f3 / f1|<0.25; and 0.50<(R5+R6) / (R5-R6)≤1.06.

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