Imaging lens system, image taking apparatus and electronic device

Abstract

Optical imaging lens system comprising eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8), wherein the eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8) are arranged in order from the object side to the image side along the beam path: a first lens element (E1), a second lens element (E2), a third lens element (E3), a fourth lens element (E4), a fifth lens element (E5), a sixth lens element (E6), a seventh lens element (E7) and an eighth lens element (E8), where each of the eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8) has an object-side surface facing the object side and an image-side surface facing the image side, where the first lens element (E1) has a negative refractive power, the second lens element (E2) has a negative refractive power and the image-side surface of the second lens element (E2) is concave in its near-axis region, the object-side surface of the fourth lens element (E4) is concave in its axial region, the object-side surface of the fifth lens element (E5) is convex in its axial region, the sixth lens element (E6) has a negative refractive power, the image-side surface of the eighth lens element (E8) has at least one inflection point (IS), where f is the focal length of the imaging lens system, f78 is the combined focal length of the seventh lens element (E7) and the eighth lens element (E8), R2 is the radius of curvature of the image-side surface of the first lens element (E1) and R4 is the radius of curvature of the image-side surface of the second lens element (E2), the following conditions are met: − 1.20 < f / f 78 < 0.10 and 0.10 < | R 2 / R 4 | < 10.00.

Description

BACKGROUND Subject area

[0001] The present disclosure relates to an optical imaging lens system and an image acquisition device. In particular, the present disclosure relates to a compact optical imaging lens system and an image acquisition device applicable in electronic devices. Description of the previously known technique

[0002] Recent advances in semiconductor processing technology have increased the performance of image sensors, enabling smaller pixel sizes. As a result, high-quality optical lens arrays have become an indispensable component of many modern electronic devices. With the rapid development of technology, the applications of electronic devices using optical lens arrays are expanding, creating a wide variety of requirements for these arrays. However, achieving a balance between image quality, sensitivity, aperture, volume, and field of view is challenging with conventional optical lens arrays. Therefore, there is a need for a lens array for image acquisition systems that meets these requirements. SUMMARY

[0003] In one aspect of the present disclosure, an optical imaging lens system comprises eight lens elements, namely, in order from the object side to the image side along the beam path, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element. Each of the eight lens elements has an object-side surface facing the object side and an image-side surface facing the image side. Preferably, the first lens element has negative refractive power. Preferably, the second lens element has negative refractive power. Preferably, the image-side surface of the second lens element is concave in its region near the axis. Preferably, the object-side surface of the fourth lens element is concave in its region near the axis.Preferably, the object-side surface of the fifth lens element is convex in its axial region. Preferably, the sixth lens element has negative refractive power. Preferably, the image-side surface of the eighth lens element has at least one inflection point. With f being the focal length of the imaging lens system, f78 the combined focal length of the seventh and eighth lens elements, R2 the radius of curvature of the image-side surface of the first lens element, and R4 the radius of curvature of the image-side surface of the second lens element, the following conditions are preferably met: -1.20 < f / f78 < 0.10 and 0.10 < |R2 / R4| < 10.00.

[0004] In the imaging lens system of the preceding aspect, the following condition is met with FOV for the maximum field of view of the imaging lens system: 120.0° < FOV < 190.0°.

[0005] In the imaging lens system of the preceding aspect, with BL for the axial distance between the image-side surface of the eighth lens element and the image surface and ImgH for the maximum image height, the following condition is met: 0.50 < 10xBL / ImgH < 3.00.

[0006] In the imaging lens system of the preceding aspect, the imaging lens system may also have an aperture diaphragm, where SL represents the axial distance between the aperture diaphragm and the image surface and TL represents the axial distance between the object-side surface of the first lens element and the image surface, and the following condition is met: 0.30 < SL / TL < 0.55.

[0007] In the imaging lens system of the preceding aspect, with CT1 for the central thickness of the first lens element, CT2 for the central thickness of the second lens element, CT3 for the central thickness of the third lens element, CT4 for the central thickness of the fourth lens element, CT5 for the central thickness of the fifth lens element, CT6 for the central thickness of the sixth lens element, CT7 for the central thickness of the seventh lens element, CT8 for the central thickness of the eighth lens element, CTmax for the maximum among CT1, CT2, CT3, CT4, CT5, CT6, CT7, CT8 and f for the focal length of the imaging lens system, the following condition is satisfied: 0.40 < CTmax / f < 1.20.

[0008] In the imaging lens system of the preceding aspect, with f123 for the combined focal length of the first lens element, the second lens element and the third lens element and f567 for the combined focal length of the fifth lens element, the sixth lens element and the seventh lens element, the following condition is met: 0.60 < f123 / f567 < 8.00.

[0009] In the imaging lens system of the preceding aspect, with f6 for the focal length of the sixth lens element and f8 for the focal length of the eighth lens element, the following condition is fulfilled: 0.00 < |f6 / f8| < 2.00.

[0010] In the imaging lens system of the preceding aspect, the following condition is fulfilled with V8 for the Abbe number of the eighth lens element: 5.0 < V8 < 30.0.

[0011] In one aspect of the present disclosure, an imaging lens system comprises eight lens elements, namely, in order from the object side to the image side along the beam path, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element. Each of the eight lens elements has an object-side surface facing the object side and an image-side surface facing the image side. Preferably, the first lens element has negative refractive power. Preferably, the second lens element has negative refractive power. Preferably, the object-side surface of the fourth lens element is concave in its near-axis region. Preferably, the sixth lens element has negative refractive power.With f1 for the focal length of the first lens element, f7 for the focal length of the seventh lens element and V8 for the Abbe number of the eighth lens element, the following conditions are preferably met: 0.00 < |f1 / f7| < 0.60 and 5.0 < V8 < 30.0.

[0012] In the imaging lens system of the preceding aspect, the third lens element has positive refractive power and the fifth lens element has positive refractive power.

[0013] In the imaging lens system of the preceding aspect, with TL for the axial distance between the object-side surface of the first lens element and the image surface and ImgH for the maximum image height of the imaging lens system, the following condition is met: 2.00 < TL / ImgH < 4.00.

[0014] In the imaging lens system of the preceding aspect, with ImgH for the maximum image height of the imaging lens system and f for the focal length of the imaging lens system, the following condition is met: 1.00 < ImgH / f < 2.00.

[0015] In the imaging lens system of the preceding aspect, with TD for the axial distance between the object-side surface of the first lens element and the image-side surface of the eighth lens element and f for the focal length of the imaging lens system, the following condition is met: 2.50 < TD / f < 5.00.

[0016] In the imaging lens system of the preceding aspect, with BL for the axial distance between the image-side surface of the eighth lens element and the image surface and CT3 for the central thickness of the third lens element, the following condition is met: 0.15 < BL / CT3 < 0.70.

[0017] In the imaging lens system of the preceding aspect, with Dr3r6 for the axial distance between the object-side surface of the second lens element and the image-side surface of the third lens element and Dr9r12 for the axial distance between the object-side surface of the fifth lens element and the image-side surface of the sixth lens element, the following condition is met: 1.60 < Dr3r6 / Dr9r12 < 3.00.

[0018] In the imaging lens system of the preceding aspect, with T12 for the axial distance between the first lens element and the second lens element and T67 for the axial distance between the sixth lens element and the seventh lens element, the following condition is met: 0.50 < T12 / T67 < 4.00.

[0019] In the imaging lens system of the preceding aspect, the central thickness of the third lens element is maximal among the central thicknesses of the eight lens elements.

[0020] In one aspect of the present disclosure, an imaging lens system comprises eight lens elements, namely, in order from the object side to the image side along the beam path, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element. Each of the eight lens elements has an object-side surface facing the object side and an image-side surface facing the image side. Preferably, the first lens element has negative refractive power. Preferably, the second lens element has negative refractive power. Preferably, the object-side surface of the fourth lens element is concave in its near-axis region. Preferably, the sixth lens element has negative refractive power. Preferably, the image-side surface of the eighth lens element has at least one inflection point.With TD being the axial distance between the object-side surface of the first lens element and the image-side surface of the eighth lens element, f being the focal length of the imaging lens system, and f78 being the combined focal length of the seventh and eighth lens elements, the following conditions are preferably met: 2.00 < TD / f < 5.00 and -0.80 < f / f78 < 0.00.

[0021] In the imaging lens system of the preceding aspect, the image-side surface of the fourth lens element is convex in its near-axis region and the object-side surface of the fifth lens element is convex in its near-axis region.

[0022] In the imaging lens system of the preceding aspect, the object-side surface of the second lens element can have at least one inflection point.

[0023] In the imaging lens system of the preceding aspect, at least one of the third lens element, the fourth lens element and the fifth lens element is made of glass.

[0024] In the imaging lens system of the preceding aspect, with BL for the axial distance between the image-side surface of the eighth lens element and the image surface and f for the focal length of the imaging lens system, the following condition is met: 1.50 < 10×BL / f < 4.00.

[0025] In the imaging lens system of the preceding aspect, with f2 for the focal length of the second lens element and f4 for the focal length of the fourth lens element, the following condition is fulfilled: 0.00 < |f2 / f4| < 1.60.

[0026] In the imaging lens system of the preceding aspect, with ΣCT for the sum of the central thicknesses of the lens elements of the imaging lens system and ΣAT for the sum of the axial distances between successive lens elements of the imaging lens system, the following condition is satisfied: 1.20 < ΣCT / ΣAT < 2.50.

[0027] In the imaging lens system of the preceding aspect, the imaging lens system can also have an aperture diaphragm, where with Dr1rs for the axial distance between the object-side surface of the first lens element and the aperture diaphragm and f for the focal length of the imaging lens system, the following condition is satisfied: 1.50 < Dr1rs / f < 3.50.

[0028] In the imaging lens system of the preceding aspect, the following condition is fulfilled with V6 for the Abbe number of the sixth lens element: 5.0 < V6 < 26.0.

[0029] In the imaging lens system of the preceding aspect, with f being the focal length of the imaging lens system, f78 the combined focal length of the seventh and eighth lens elements, R2 the radius of curvature of the image-side surface of the first lens element, R4 the radius of curvature of the image-side surface of the second lens element, f1 the focal length of the first lens element, f7 the focal length of the seventh lens element, V8 the Abbe number of the eighth lens element, and TD the axial distance between the object-side surface of the first lens element and the image-side surface of the eighth lens element, the following conditions are satisfied: -0.43 ≤ f / f78 ≤ -0.10, 0.53 ≤ |R2 / R4| ≤ 0.69, 0.01 ≤ |f1 / f7| ≤ 0.22, 18.2 ≤ V8 ≤ 25.6 and 3.49 ≤ TD / f ≤ 4.55.

[0030] In one aspect of the present disclosure, an image-taking apparatus comprises the imaging lens system of the preceding aspect and an image sensor, wherein the image sensor is arranged in the image area of ​​the imaging lens system.

[0031] In one aspect of the present disclosure, an electronic device comprises the image-capturing apparatus of the preceding aspect. BRIEF DESCRIPTION OF THE FIGURES

[0032] The present disclosure will become more understandable upon reading the following detailed description of the embodiments with reference to the accompanying figures: Fig. Figure 1A is a schematic view of an image recording apparatus in the first embodiment of the present disclosure. Fig. Figure 1B shows the curves of the spherical aberration, astigmatic field curves and the curve of the distortion of the image acquisition apparatus of the 1st embodiment. Fig.Figure 2A is a schematic view of an image recording apparatus in the second embodiment of the present disclosure. Fig. Figure 2B shows the curves of the spherical aberration, astigmatic field curves and the curve of the distortion of the image acquisition apparatus of the 2nd embodiment. Fig. Figure 3A is a schematic view of an image recording apparatus in the 3rd embodiment of the present disclosure. Fig. Figure 3B shows the curves of the spherical aberration, astigmatic field curves and the curve of the distortion of the image acquisition apparatus of the 3rd embodiment. Fig. Figure 4A is a schematic view of an image recording apparatus in the 4th embodiment of the present disclosure. Fig. Figure 4B shows the curves of the spherical aberration, astigmatic field curves and the curve of the distortion of the image acquisition apparatus of the 4th embodiment. Fig.Figure 5A is a schematic view of an image recording apparatus in the 5th embodiment of the present disclosure. Fig. Figure 5B shows the curves of the spherical aberration, astigmatic field curves and the curve of the distortion of the image acquisition apparatus of the 5th embodiment. Fig. Figure 6A is a schematic view of an image recording apparatus in the 6th embodiment of the present disclosure. Fig. Figure 6B shows the curves of the spherical aberration, astigmatic field curves and the curve of the distortion of the image acquisition apparatus of the 6th embodiment. Fig. Figure 7A is a schematic view of an image recording apparatus in the 7th embodiment of the present disclosure. Fig. Figure 7B shows the curves of the spherical aberration, astigmatic field curves and the curve of the distortion of the image acquisition apparatus of the 7th embodiment. Fig.Figure 8A is a schematic view of an image recording apparatus in the 8th embodiment of the present disclosure. Fig. Figure 8B shows the curves of the spherical aberration, astigmatic field curves and the curve of the distortion of the image acquisition apparatus of the 8th embodiment. Fig. Figure 9A is a schematic view of an image recording apparatus in the 9th embodiment of the present disclosure. Fig. Figure 9B shows the curves of the spherical aberration, astigmatic field curves and the curve of the distortion of the image acquisition apparatus of the 9th embodiment. Fig. Figure 10A is a schematic view of an image recording apparatus in the 10th embodiment of the present disclosure. Fig. Figure 10B shows the curves of the spherical aberration, astigmatic field curves and the curve of the distortion of the image acquisition apparatus of the 10th embodiment. Fig.Figure 11A is a schematic view of an image recording apparatus in the 11th embodiment of the present disclosure. Fig. Figure 11B shows the curves of the spherical aberration, astigmatic field curves and the curve of the distortion of the image acquisition apparatus of the 11th embodiment. Fig. Figure 12A is a schematic view of an image recording apparatus in the 12th embodiment of the present disclosure. Fig. Figure 12B shows the curves of the spherical aberration, astigmatic field curves and the curve of the distortion of the image acquisition apparatus of the 12th embodiment. Fig. Figure 13 is a schematic view of the inflection points and critical points of each lens element in the first embodiment. Fig. Figure 14 is a schematic view of an image recording apparatus in the 13th embodiment of the present disclosure. Fig.Figure 15A is a schematic view of one side of an electronic device in the 14th embodiment of the present disclosure. Fig. 15B is a schematic view of another side of the electronic device of the Fig. 15A. Fig. 15C is a block diagram of the electronic device of the Fig. 15A. Fig. Figure 16 is a schematic view of one side of an electronic device in the 15th embodiment of the present disclosure. Fig. Figure 17 is a schematic view of one side of an electronic device in the 16th embodiment of the present disclosure. Fig. Figure 18A is a schematic view of one side of an electronic device in the 17th embodiment of the present disclosure. Fig. Figure 18B is a schematic view of another side of the electronic device in the 17th embodiment of the Fig. 18A. Fig. Figure 19 is a schematic view of one side of an electronic device in the 18th embodiment of the present disclosure. DETAILED DESCRIPTION

[0033] An imaging lens system comprises eight lens elements, namely, in order from the object side to the image side along the beam path, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element. Each of the eight lens elements has an object-side surface facing the object side and an image-side surface facing the image side.

[0034] The first lens element can have negative refractive power, which is advantageous for enlarging the field of vision.

[0035] The second lens element can have negative refractive power, which, in conjunction with the third lens element, is advantageous for correcting spherical aberration. The image-side surface of the second lens element can be concave in its near-axis region, which is beneficial for correcting astigmatism of the imaging lens system and balancing the image quality of the central and peripheral areas of the image. The object-side surface of the second lens element can have at least one inflection point, which is advantageous for correcting off-axis distortion caused by the large field of view.

[0036] The third lens element can have positive refractive power, which is advantageous for reducing the volume of the object side of the imaging lens system.

[0037] The object-side surface of the fourth lens element is concave in its near-axis region, which is advantageous for reducing the angular difference between the incident ray and the optical axis by adjusting the surface shape and refractive power of the fourth lens element. The image-side surface of the fourth lens element can be convex in its near-axis region, which is advantageous for reducing total internal reflection by adjusting the exit direction of the ray from the fourth lens element.

[0038] The fifth lens element can have positive refractive power, which is advantageous for distributing the light-gathering capacity of the imaging lens system. The object-side surface of the fifth lens element can be convex in its near-axis region, which is beneficial by adjusting the surface shape of the fifth lens element to increase its positive refractive power.

[0039] The sixth lens element can have negative refractive power, which is advantageous for compensating for distortion caused by the reduction in volume of the imaging lens system.

[0040] The image-side surface of the eighth lens element can have at least one inflection point. This is advantageous for correcting image curvature and distortion, and also for reducing the overall path length of the imaging lens system.

[0041] The central thickness of the third lens element can be at its maximum below the central thicknesses of the eight lens elements. This is advantageous for providing sufficient beam convergence of the imaging lens system.

[0042] At least one of the third, fourth, and fifth lens elements can be made of glass. This is advantageous for reducing the degradation of image quality due to fluctuations in ambient temperature.

[0043] With f being the focal length of the imaging lens system and f78 being the combined focal length of the seventh and eighth lens elements, the following condition is satisfied: -1.20 < f / f78 < 0.10. This is advantageous for correcting spherical aberration and astigmatism and for a balanced distribution of refractive power on the image side of the imaging lens system to improve image quality. Furthermore, the following conditions can be satisfied: -0.80 < f / f78 < 0.00. Additionally, the following conditions can be satisfied: -0.60 < f / f78 < -0.05. Furthermore, the following condition can be satisfied: -0.43 ≤ f / f78 ≤ -0.10.

[0044] With R2 being the radius of curvature of the image-side surface of the first lens element and R4 the radius of curvature of the image-side surface of the second lens element, the following condition is preferably met: 0.10 < |R2 / R4| < 10.00. This is advantageous for adjusting the direction of light propagation to increase the viewing angle. Furthermore, the following conditions can be met: 0.15 < |R2 / R4| < 4.00. Furthermore, the following conditions can be met: 0.20 < |R2 / R4| < 2.00. Furthermore, the following conditions can be met: 0.30 < |R2 / R4| < 1.00. Furthermore, the following condition can be met: 0.53 ≤ |R2 / R4| ≤ 0.69.

[0045] With f1 being the focal length of the first lens element and f7 the focal length of the seventh lens element, the following condition is satisfied: 0.00 < |f1 / f7| < 0.60. This is advantageous for improving image quality through a balanced distribution of the refractive power of the imaging lens system. Furthermore, the following conditions can be satisfied: 0.00 < |f1 / f7| < 0.40. Additionally, the following conditions can be satisfied: 0.00 < |f1 / f7| < 0.30. Furthermore, the following condition can be satisfied: 0.01 ≤ |f1 / f7| ≤ 0.22.

[0046] With V8 for the Abbe number of the eighth lens element, the following condition is satisfied: 5.0 < V8 < 30.0. This is advantageous for achieving compensation between chromatic aberration and rear focal length by adjusting the Abbe number of the eighth lens element. Furthermore, the following condition can be satisfied: 10.0 < V8 < 28.0. Additionally, the following condition can be satisfied: 18.2 ≤ V8 ≤ 25.6.

[0047] With TD being the axial distance between the object-side surface of the first lens element and the image-side surface of the eighth lens element, and f being the focal length of the imaging lens system, the following condition is satisfied: 2.00 < TD / f < 5.00. This is advantageous for balancing the total path length and the viewing angle of the imaging lens system to create the wide-angle property. Furthermore, the following conditions can be satisfied: 2.50 < TD / f < 5.00. Additionally, the following conditions can be satisfied: 3.00 < TD / f < 4.80. Furthermore, the following condition can be satisfied: 3.49 ≤ TD / f ≤ 4.55.

[0048] With a field of view (FOV) of 120.0° < FOV < 190.0° for the maximum field of view of the imaging lens system, the following condition is met: This is advantageous for achieving a larger field of view of the imaging lens system and for increasing the image capture area. Furthermore, the following condition can be met: 125.0° < FOV < 190.0°.

[0049] With BL representing the axial distance between the image-side surface of the eighth lens element and the image plane, and ImgH representing the maximum image height of the imaging lens system, the following condition is met: 0.50 < 10×BL / ImgH < 3.00. This is advantageous for shortening the rear focal length of the imaging lens system to adjust its overall path length. Furthermore, the following condition can be met: 1.00 < 10×BL / ImgH < 2.50.

[0050] The imaging lens system can also include an aperture diaphragm, where SL is the axial distance between the aperture diaphragm and the image surface, and TL is the axial distance between the object-side surface of the first lens element and the image surface, and the following condition is met: 0.30 < SL / TL < 0.55. This is advantageous for adjusting the field of view and volume of the imaging lens system by adjusting the position of the aperture diaphragm. Furthermore, the following condition can be met: 0.40 < SL / TL < 0.50.

[0051] With CT1 for the central thickness of the first lens element, CT2 for the central thickness of the second lens element, CT3 for the central thickness of the third lens element, CT4 for the central thickness of the fourth lens element, CT5 for the central thickness of the fifth lens element, CT6 for the central thickness of the sixth lens element, CT7 for the central thickness of the seventh lens element, CT8 for the central thickness of the eighth lens element, CTmax for the maximum value among CT1, CT2, CT3, CT4, CT5, CT6, CT7, CT8, and f for the focal length of the imaging lens system, the following condition is met: 0.40 < CTmax / f < 1.20. This is advantageous for controlling the shaping of the lens elements with the aim of reducing the difficulty of their manufacture. Furthermore, the following condition can be met: 0.65 < CTmax / f < 1.00.

[0052] With f123 for the combined focal length of the first, second, and third lens elements, and f567 for the combined focal length of the fifth, sixth, and seventh lens elements, the following condition is met: 0.60 < f123 / f567 < 8.00. This is advantageous for increasing the light-gathering power while widening the field of view and for controlling aberrations. Furthermore, the following condition can be met: 1.50 < f123 / f567 < 7.00.

[0053] With f6 for the focal length of the sixth lens element and f8 for the focal length of the eighth lens element, the following condition is satisfied: 0.00 < |f6 / f8| < 2.00. This is advantageous for a balanced distribution of refractive power on the image side of the imaging lens system and for correcting aberrations. Furthermore, the following condition can be satisfied: 0.40 < |f6 / f8| < 1.40.

[0054] With TL representing the axial distance between the object-side surface of the first lens element and the image plane, and ImgH representing the maximum image height of the imaging lens system, the following condition is met: 2.00 < TL / ImgH < 4.00. This is advantageous for reducing the overall path length of the imaging lens system and achieving a larger light-gathering area. Furthermore, the following condition can be met: 2.20 < TL / ImgH < 3.50. Additionally, the following condition can be met: 2.40 < TL / ImgH < 3.00.

[0055] With ImgH representing the maximum image height of the imaging lens system and f representing the focal length of the imaging lens system, the following condition is met: 1.00 < ImgH / f < 2.00. This is advantageous for controlling the field of view of the imaging lens system. Furthermore, the following condition can be met: 1.15 < ImgH / f < 1.85.

[0056] With BL representing the axial distance between the image-side surface of the eighth lens element and the image plane, and CT3 representing the central thickness of the third lens element, the following condition is met: 0.15 < BL / CT3 < 0.70. This is advantageous for controlling the shape of the third lens element. Furthermore, the following condition can be met: 0.20 < BL / CT3 < 0.40.

[0057] With Dr3r6 for the axial distance between the object-side surface of the second lens element and the image-side surface of the third lens element, and Dr9r12 for the axial distance between the object-side surface of the fifth lens element and the image-side surface of the sixth lens element, the following condition is met: 1.60 < Dr3r6 / Dr9r12 < 3.00. This is advantageous for increasing the assembly rate by controlling the arrangement of the lens elements of the imaging lens system. Furthermore, the following condition can be met: 2.00 < Dr3r6 / Dr9r12 < 2.80.

[0058] With T12 for the axial distance between the first and second lens elements and T67 for the axial distance between the sixth and seventh lens elements, the following condition is met: 0.50 < T12 / T67 < 4.00. This is advantageous for balanced space utilization on the object and image sides of the imaging lens system and for achieving a large field of view. Furthermore, the following condition can be met: 0.80 < T12 / T67 < 2.50.

[0059] With BL being the axial distance between the image-side surface of the eighth lens element and the image plane, and f being the focal length of the imaging lens system, the following condition is satisfied: 1.50 < 10×BL / f < 4.00. This is advantageous for shortening the rear focal length of the imaging lens system, thereby reducing its overall path length. Furthermore, the following condition can be satisfied: 2.00 < 10×BL / f < 3.50.

[0060] With f2 being the focal length of the second lens element and f4 the focal length of the fourth lens element, the following condition is satisfied: 0.00 < |f2 / f4| < 1.60. This is advantageous for a balanced distribution of refractive power on the object side of the imaging lens system and for correcting aberrations. Furthermore, the following condition can be satisfied: 0.25 < |f2 / f4| < 1.40.

[0061] With ΣCT being the sum of the central thicknesses of the lens elements of the imaging lens system and ΣAT being the sum of the axial distances between successive lens elements of the imaging lens system, the following condition is satisfied: 1.20 < ΣCT / ΣAT < 2.50. This is advantageous for efficient space utilization. Furthermore, the following condition can be satisfied: 1.40 < ΣCT / ΣAT < 2.40.

[0062] With Dr1rs being the axial distance between the object-side surface of the first lens element and the aperture diaphragm, and f being the focal length of the imaging lens system, the following condition is satisfied: 1.50 < Dr1rs / f < 3.50. This is advantageous for balancing the volume of the object side and the total refractive power of the imaging lens system to magnify the field of view. Furthermore, the following condition can be satisfied: 1.70 < Dr1rs / f < 3.00.

[0063] With V6 for the Abbe number of the sixth lens element, the following condition is met: 5.0 < V6 < 26.0. This allows the material of the sixth lens element to be selected to correct chromatic aberration. Furthermore, the following condition can be met: 10.0 < V6 < 26.0.

[0064] Each of the above-mentioned features of the imaging lens system can be applied in various combinations to achieve the corresponding effects.

[0065] In the imaging lens system of the present disclosure, the lens elements can be made of glass or plastic. If the lens elements are made of glass, the refractive power distribution of the imaging lens system can be made more flexible. The glass lens element can be manufactured by grinding or casting. If the lens elements are made of plastic, the manufacturing costs can be significantly reduced. Furthermore, the surfaces of each lens element can be aspherical (ASP), since the aspherical surface of the lens element can be easily shaped in a form other than a spherical surface, thus providing more adjustable variables to eliminate its aberrations and further reduce the required number of lens elements in the imaging lens system. This also reduces the overall path length of the imaging lens system.Aspherical surfaces can be manufactured using plastic injection molding, glass casting, or other manufacturing processes.

[0066] In the imaging lens system of the present disclosure, additives can optionally be incorporated into one (or more) of the lens elements to modify the transmittance of the lens element in a specific wavelength range. This allows for the reduction of scattered light and chromatic aberration. For example, the additives in the imaging lens system can have an absorption capacity for light in a wavelength range of 600 nm to 800 nm to reduce excessive red or infrared light, or the additives in the imaging lens system can have an absorption capacity for light in a wavelength range of 350 nm to 450 nm to reduce blue or ultraviolet light. Additives can thus prevent light in a specific wavelength range from interfering with the image. Furthermore, the additives can be homogeneously mixed into the plastic, and the lens elements can be manufactured using injection molding.The additives can also be used to coat the lens surfaces in order to achieve the effects mentioned above.

[0067] In the imaging lens system of the present disclosure, a surface of the lens element being aspherical means that the entire optically effective area of ​​the surface of the lens element or a part thereof is aspherical.

[0068] In the imaging lens system of the present disclosure, if the lens elements have convex surfaces, and the convex surface area is not defined, then the aforementioned surfaces of the lens elements may be convex in their near-axial region. If the lens elements have concave surfaces, and the concave surface area is not defined, then the aforementioned surfaces of the lens elements may be concave in their near-axial region. If, in the imaging lens system of the present disclosure, the lens element has positive or negative refractive power, or the focal length of the lens element, this can all refer to the refractive power or the focal length in the near-axial region of the lens element.

[0069] In the imaging lens system of the present disclosure, a critical point is a non-axial point on the lens surface where its tangent is perpendicular to the optical axis; an inflection point is a point on a lens surface where the curvature changes from positive to negative or from negative to positive.

[0070] In the imaging lens system of the present disclosure, the image surface can be flat or curved, depending on the corresponding image sensor. In particular, the image surface can be a concavely curved surface facing the object. Furthermore, the imaging lens system of the present disclosure can optionally include at least one image correction element (such as a field plane) inserted between the lens element nearest the image surface and the image surface itself, thereby achieving the effect of correcting aberrations (such as field curvature). The optical properties of the aforementioned image correction element, such as curvature, thickness, refractive index, position, surface shape (convex or concave, spherical or aspherical, refractive surface and Fresnel surface, etc.), can be adapted according to the requirements of the image acquisition device.In general, a preferred design for the image correction part is a thin, plano-concave part with a concave surface facing the object, to be arranged at the point closest to the image surface.

[0071] In the imaging lens system of the present disclosure, the imaging lens system may also include at least one aperture, such as a diaphragm aperture, a glare diaphragm or a field diaphragm, to exclude stray light and thus increase its image resolution.

[0072] In the imaging lens system of the present disclosure, the aperture diaphragm can be arranged as an entrance diaphragm or an internal diaphragm, where entrance diaphragm means that the aperture diaphragm is arranged between the object being recorded and the first lens element, and internal diaphragm means that the aperture diaphragm is arranged between the first lens element and the image surface. If the aperture diaphragm is an entrance diaphragm, a greater distance between the exit pupil of the optical lens system and the image surface can be obtained, thus achieving a telecentric effect and thereby improving the image acquisition efficiency of the image sensor, such as a CCD or CMOS. An internal diaphragm is advantageous for increasing the field of view of the imaging lens system, thereby giving it a larger field of view.

[0073] In the imaging lens system of the present disclosure, an aperture control unit can be well configured. The aperture control unit can be a mechanical component or a light control element, and its dimensions and shape can be electrically controlled. The mechanical component can comprise a movable element, such as a blade assembly or an aperture plate. The light control element can comprise a shielding element, such as a light filter, an electrochromic material, a liquid crystal layer, or the like. The amount of incident light or the exposure time of the image can be controlled by the aperture control unit to increase the image adjustment possibilities. Additionally, the aperture control unit can be the aperture of the imaging lens system of the present disclosure to influence the image quality by changing the f-number, for example, to change the depth of field or the exposure time.

[0074] In the imaging lens system of the present disclosure, one or more optical components can be well configured to limit the beam path traversing the optical lens system. The optical component can be a filter, a polarizing filter, etc., without limitation. Furthermore, the optical component can be a single piece, a complex arrangement, or have the form of a membrane, without limitation. The optical component can be located on the object side, the image side, or between the lens elements of the imaging lens system, such that it allows specific rays to pass through it that meet the requirements of the application.

[0075] The imaging lens system of the present disclosure can comprise at least one optical lens element, an optical component, or a support. An anti-reflective coating is applied to at least one surface of at least one optical lens element, the optical component, or the support, the anti-reflective coating being advantageous for effectively reducing scattered light caused by light reflection at interfaces.The anti-reflective coating can be applied to the optically inactive area of ​​the object-side surface or the image-side surface of the optical lens element, or to the interface between the object-side surface and the image-side surface, wherein the optical component can be at least one light-blocking component, a spacer ring part, a tube part, a cover glass, a blue glass, a filter or a color filter, a beam path folding element, a prism or a mirror, etc., wherein the support can be a lens mount of a lens group, a microlens arranged on the image sensor, the periphery of the image sensor substrate, or a glass plate for protecting the image sensor, etc.

[0076] In the imaging lens system of the present disclosure, the imaging lens system of the present disclosure can be used in 3D (three-dimensional) imaging lens arrangement applications, in articles such as digital cameras, mobile terminal equipment, digital tablets, smart TVs, surveillance systems, motion detector input devices, tachograph systems, rear camera systems, body-worn devices, unmanned aerial vehicles and other image-capturing electronic articles.

[0077] The present disclosure describes an image-taking apparatus comprising the imaging lens system and an image sensor, the image sensor being arranged in the image area of ​​the imaging lens system. By shaping the surface form of the lens elements, it is advantageously suited to achieving a balanced arrangement of the beam path and the volume of the imaging lens system, achieving high image quality, and maintaining its compactness. Furthermore, the image-taking apparatus may include a tube assembly, a holding element, or a combination thereof.

[0078] The present disclosure describes an electronic device comprising the aforementioned image capture apparatus. This enables the image quality to be improved. The electronic device may further comprise a control unit, a display unit, a storage unit, a random-access memory (RAM) unit, or a combination thereof.

[0079] In accordance with the preceding description of the present disclosure, the following specific embodiments are presented for further explanation. <1. Design>

[0080] Fig. Figure 1A is a schematic view of an image recording apparatus 1 in the first embodiment of the present disclosure. Fig. Figure 1B shows the spherical aberration curves, astigmatic field curves, and distortion curve of the image-taking apparatus 1 of the first embodiment of the present disclosure. Fig.In 1A, the image-taking apparatus 1 comprises an imaging lens system (whose reference numeral has been omitted) and an image sensor IS. The imaging lens system comprises, in order from the object side to the image side along a ray path, a first lens element E1, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture ST, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image area IMG, wherein the image sensor IS is arranged in the image area IMG of the imaging lens system. The imaging lens system comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8), without one or more additional lens elements inserted between the first lens element E1 and the eighth lens element E8.

[0081] The first lens element E1 with negative refractive power has an object-side surface that is convex in its axial region and an image-side surface that is concave in its axial region. The first lens element E1 is made of glass, and both its object-side and image-side surfaces are spherical.

[0082] The second lens element E2, with negative refractive power, has an object-side surface that is convex in its near-axis region and an image-side surface that is concave in its near-axis region. The second lens element E2 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, Fig. Figure 13 shows a schematic view of the inflection points IP and the critical points CP of each lens element in the first embodiment. Fig.13 The object-side surface of the second lens element E2 has an inflection point IP (as in Fig. 13) and a critical point CP (as shown in Fig. 13 shown).

[0083] The third lens element E3, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The third lens element E3 is made of glass, and both its object-side and image-side surfaces are spherical.

[0084] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in its near-axis region and an image-side surface that is convex in its near-axis region. The fourth lens element E4 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the fourth lens element E4 has an inflection point IP (as shown in Figure 1). Fig. 13) and the image-side surface of the fourth lens element E4 has an inflection point IP (as shown in Fig. 13) and a critical point CP (as shown in Fig. 13 shown).

[0085] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in its near-axis region and an image-side surface that is also convex in its near-axis region. The fifth lens element E5 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the fifth lens element E5 has an inflection point IP (as shown in...). Fig. 13 shown).

[0086] The sixth lens element E6, with negative refractive power, has an object-side surface that is concave in its near-axis region, and an image-side surface that is also concave in its near-axis region. The sixth lens element E6 is made of plastic, and both its object-side and image-side surfaces are aspherical.

[0087] The seventh lens element E7, with positive refractive power, has an object-side surface that is convex in its near-axis region and an image-side surface that is concave in its near-axis region. The seventh lens element E7 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the seventh lens element E7 has an inflection point IP (as shown in Fig. 13) and a critical point CP (as shown in Fig. 13) and the image-side surface of the seventh lens element E7 has an inflection point IP (as shown in Fig. 13) and a critical point CP (as shown in Fig. 13 shown).

[0088] The eighth lens element E8, with negative refractive power, has an object-side surface that is concave in its near-axis region, and an image-side surface that is also concave in its near-axis region. The eighth lens element E8 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the image-side surface of the eighth lens element E8 has an inflection point IP (as shown in...). Fig. 13) and a critical point CP (as shown in Fig. 13 shown).

[0089] The filter E9 is made of glass and is arranged in sequence between the eighth lens element E8 and the image surface IMG and does not affect the focal length of the imaging lens system.

[0090] The equation for the aspherical surface profiles of the lens elements of the first embodiment mentioned above is as follows: X(Y)=(Y2 / R) / (1+sqrt(1−(1+k)×(Y / R)2))+∑i(Ai)×(Yi) wherein X is the displacement parallel to an optical axis from the intersection of the aspherical surface with the optical axis to a point at a distance Y from the optical axis on the aspherical surface, Y is the vertical distance of the point on the aspherical surface from the optical axis, R is the radius of curvature, k is the conic constant, and Ai is the i-th aspheric coefficient.

[0091] In the imaging lens system of the first embodiment, with f being the focal length of the imaging lens system, Fno the f-number of the imaging lens system, and HFOV half the maximum field of view of the imaging lens system, these parameters have the following values: f = 4.56 mm, Fno = 2.80 and HFOV = 74.6°.

[0092] In the imaging lens system of the first embodiment, the following condition is met for the maximum field of view of the imaging lens system: FOV = 149.2°.

[0093] In the imaging lens system in the first embodiment, the following condition is met with TL for the axial distance between the object-side surface of the first lens element E1 and the image surface IMG and ImgH for the maximum image height of the imaging lens system: TL / ImgH = 2.85.

[0094] In the imaging lens system in the 1st embodiment, the following condition is met with BL for the axial distance between the image-side surface of the eighth lens element E8 and the image surface IMG and ImgH for the maximum image height: 10xBL / ImgH = 1.77.

[0095] In the imaging lens system in the 1st embodiment, the following condition is met with SL for the axial distance between the aperture ST and the image surface IMG and TL for the axial distance between the object-side surface of the first lens element E1 and the image surface IMG: SL / TL = 0.44.

[0096] In the imaging lens system of the first embodiment, the following condition is met with CT1 for the central thickness of the first lens element E1, CT2 for the central thickness of the second lens element E2, CT3 for the central thickness of the third lens element E3, CT4 for the central thickness of the fourth lens element E4, CT5 for the central thickness of the fifth lens element E5, CT6 for the central thickness of the sixth lens element E6, CT7 for the central thickness of the seventh lens element E7, CT8 for the central thickness of the eighth lens element E8, CTmax for the maximum among CT1, CT2, CT3, CT4, CT5, CT6, CT7, CT8 and f for the focal length of the imaging lens system: CTmax / f = 0.78.

[0097] In the imaging lens system of the first embodiment, with f being the focal length of the imaging lens system and ImgH being the maximum image height of the imaging lens system, the following condition is met: ImgH / f = 1.34.

[0098] In the imaging lens system in the 1st embodiment, with TD for the axial distance between the object-side surface of the first lens element E1 and the image-side surface of the eighth lens element E8 and f for the focal length of the imaging lens system, the following condition is met: TD / f = 3.59.

[0099] In the imaging lens system in the 1st embodiment, with BL for the axial distance between the image side of the eighth lens element E8 and the image surface IMG and f for the focal length of the imaging lens system, the following condition is fulfilled: 10×BL / f = 2.38.

[0100] In the imaging lens system of the first embodiment, with f1 being the focal length of the first lens element E1, f2 the focal length of the second lens element E2, f4 the focal length of the fourth lens element E4, f6 the focal length of the sixth lens element E6, f7 the focal length of the seventh lens element E7 and f8 the focal length of the eighth lens element E8, the following conditions are met: |f1 / f7| = 0.05, |f2 / f4| = 0.98 and |f6 / f8| = 0.98.

[0101] In the imaging lens system in the first embodiment, with f being the focal length of the imaging lens system and f78 being the combined focal length of the seventh lens element E7 and the eighth lens element E8, the following condition is met: f / f78 = -0.38.

[0102] In the imaging lens system in the 1st embodiment, with f123 for the combined focal length of the first lens element E1, the second lens element E2 and the third lens element E3 and f567 for the combined focal length of the fifth lens element E5, the sixth lens element E6 and the seventh lens element E7, the following condition is met: f123 / f567 = 3.57.

[0103] In the imaging lens system in the first embodiment, the following condition is met with Dr1rs for the axial distance between the object-side surface of the first lens element E1 and the aperture ST and f for the focal length of the imaging lens system: Dr1rs / f = 2.15.

[0104] In the imaging lens system in the first embodiment, the following condition is met with ΣCT for the sum of the central thicknesses of the lens elements of the imaging lens system and ΣAT for the sum of the axial distances between successive lens elements of the imaging lens system: ΣCT / ΣAT = 2.10.

[0105] In the imaging lens system in the first embodiment, the following condition is met with T12 for the axial distance between the first lens element E1 and the second lens element E2 and T67 for the axial distance between the sixth lens element E6 and the seventh lens element E7: T12 / T67 = 1.03.

[0106] In the imaging lens system in the 1st embodiment, the following condition is met with BL for the axial distance between the image-side surface of the eighth lens element E8 and the image surface IMG and CT3 for the central thickness of the third lens element E3: BL / CT3 = 0.30.

[0107] In the imaging lens system in the first embodiment, the following condition is met with Dr3r6 for the axial distance between the object-side surface of the second lens element E2 and the image-side surface of the third lens element E3 and Dr9r12 for the axial distance between the object-side surface of the fifth lens element E5 and the image-side surface of the sixth lens element E6: Dr3r6 / Dr9r12 = 2.41.

[0108] In the imaging lens system in the first embodiment, the following condition is met with R2 being the radius of curvature of the image-side surface of the first lens element E1 and R4 being the radius of curvature of the image-side surface of the second lens element E2: |R2 / R4| = 0.65.

[0109] In the imaging lens system in the first embodiment, the following conditions are met with V6 for the Abbe number of the sixth lens element E6 and V8 for the Abbe number of the eighth lens element E8: V6 = 19.5 and V8 = 21.3.

[0110] The optical data of the first embodiment are shown in Table 1A and the data of the aspherical surfaces are shown in Table 1B below. Table 1A - 1. Design f = 4.56 mm, Fno = 2.80, HFOV = 74.6° Surface No. radius of curvature thickness material index Abbesche number Focal length 0 object infinite infinite 1 Lens 1 21,3354 SHP 1,994 Glass 1,804 46,5 -6,43 2 3,9907 SHP 1,864 3 Lens 2 21,3666 ASP 0,952 plastic 1,669 19,5 -13,13 4 6,1154 ASP 0,144 5 Lens 3 4,9649 SPH 3,563 Glass 1,805 25,5 4,80 6 -11,9020 SPH 0,398 7 Lens 4 -3,9675 ASP 0,399 plastic 1,650 21,8 -13,43 8 -7,5644 ASP 0,495 9 Opening aperture even -0,156 10 Lens 5 3,1845 ASP 1,114 plastic 1,544 56,0 3,74 11 -4,9226 ASP 0,041 12 Lens 6 -50,2334 ASP 0,777 plastic 1,669 19,5 -10,62 13 8,3243 ASP 1,804 14 Lens 7 46,6796 ASP 1,068 plastic 1,544 56,0 129,34 15 137,5606 ASP 0,696 16 Lens 8 -28,6557 ASP 1,231 plastic 1,657 21,3 -10,79 17 9,5744 ASP 0,308 18 filter even 0,210 Glass 1,517 64,2 - 19 even 0,565 20 Picture even - The reference wavelength is 587.6 nm (d-line). Table 1B - Aspheric coefficients Surface No. 3 4 7 8 k = 3.34498E+01 -3.35433E+00 -1.12545E+01 -2.19289E+01 A4 = 4.404151309E-03 9.730228407E-03 4.745594163E-03 1.729014195E-03 A6 = -8.059004598E-04 -1.027212873E-03 -1.764508197E-03 8.170254839E-04 A8 = 5.443247413E-05 2.207304363E-04 6.230145548E-04 2.508646124E-05 A10= 5.910857773E-06 -6.363910582E-05 -3.561634583E-05 1.061293126E-04 A12= -5.323309892E-06 7.428942501E-06 A14= 1.033504097E-06 -4.524127963E-07 A16= -9.467315825E-08 9.187022186E-08 A18= 4.288817804E-09 -1.461413629E-08 A20= -7.700470157E-11 7.421229368E-10 Surface No. 10 11 12 13 k = -6.01470E+00 5.71129E-02 8.72632E+01 -8.80396E+01 A4 = 4.164787849E-04 -1.079602153E-02 -1.119285135E-02 2.137199566E-02 A6 = 1.567419787E-03 -1.433375388E-02 1.881733629E-02 -8.782002530E-03 A8 = -4.883888259E-04 8.923990874E-02 -1.575222680E-02 6.729380862E-03 A10= -1.521182977E-03 -1.929434137E-01 8.200106541E-03 -3.803607054E-03 A12= 1.186374542E-03 2.349895574E-01 -2.935036898E-03 1.462733603E-03 A14= -3.052910339E-04 -1.789219571 E-01 6.351136501E-04 -3.740979641E-04 A16= 8.635160990E-02 -6.044993684E-05 5.711761991E-05 A18= -2.559960641E-02 -3.892148631E-06 A20= 4.241624774E-03 A22= -2.999834957E-04 Surface No. 14 15 16 17 k = 9.43524E+01 8.73546E+01 -9.87776E+01 -1.41480E+01 A4 = -7.455244967E-03 7.414802463E-03 7.807741768E-03 1.961173459E-02 A6 = 5.986363165E-03 -9.161485578E-04 -1.246233125E-02 -1.881784567E-02 A8 = -5.186785722E-03 -7.285739434E-05 5.132167179E-03 8.050058357E-03 A10= 2.334356007E-03 -2.926981777E-05 -8.710614984E-04 -2.300721838E-03 A12= -7. 172444166E-04 1.447028511E-05 -1.075041238E-04 4.706458196E-04 A14= 1.553024928E-04 -2.178547868E-06 9.587123636E-05 -7.042724596E-05 A16= -2.283046576E-05 1.608816203E-07 -2.613223863E-05 7.750513381E-06 A18= 2.108224253E-06 -5.975756784E-09 4.321756582E-06 -6.265771937E-07 A20= -1.074724576E-07 8.888459768E-11 -4.812893170E-07 3.696504297E-08 A22= 2.234495702E-09 3.689693981 E-08 -1.568044446E-09 A24= -1.923089333E-09 4.648974080E-11 A26= 6.514047098E-11 -9.134275887E-13 A28= -1.293698878E-12 1.067949638E-14 A30= 1.143417006E-14 -5.622628472E-17

[0111] Table 1A lists the radius of curvature, thickness, and focal length in millimeters (mm). Surface numbers 0–20 indicate the surfaces in order from the object side to the image side along the optical axis. In Table 1B, k represents the conical constant of the equation for the aspherical surface profiles. A4–A30 are the aspherical coefficients from the 4th to the 30th order. The tables shown below for each embodiment correspond to the schematic parameters and aberration curves of each embodiment, and the definitions in the tables are the same as those in Table 1A and Table 1B of the first embodiment. Therefore, they are not explained again. <2nd embodiment>

[0112] Fig. 2A is a schematic view of an image recording apparatus 2 in the 2nd embodiment of the present disclosure. Fig.Figure 2B shows the curves of the spherical aberration, astigmatic field curves, and the distortion curve of the image acquisition device 2 of the second embodiment. Fig.2A The image-taking apparatus 2 comprises an imaging lens system (whose reference numeral has been omitted) and an image sensor IS. The imaging lens system comprises, in order from the object side to the image side along the optical path, a first lens element E1, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture ST, a fifth lens element E5, a sixth lens element E6, an aperture S1, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image area IMG, wherein the image sensor IS is arranged in the image area IMG of the imaging lens system. The imaging lens system comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8), without one or more additional lens elements inserted between the first lens element E1 and the eighth lens element E8.

[0113] The first lens element E1 with negative refractive power has an object-side surface that is convex in its axial region and an image-side surface that is concave in its axial region. The first lens element E1 is made of glass, and both its object-side and image-side surfaces are spherical.

[0114] The second lens element E2, with negative refractive power, has an object-side surface that is convex in its near-axis region and an image-side surface that is concave in its near-axis region. The second lens element E2 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the second lens element E2 has an inflection point and a critical point.

[0115] The third lens element E3, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The third lens element E3 is made of glass, and both its object-side and image-side surfaces are spherical.

[0116] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in its near-axis region and an image-side surface that is convex in its near-axis region. The fourth lens element E4 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the fourth lens element E4 has an inflection point, and the image-side surface of the fourth lens element E4 has an inflection point and a critical point.

[0117] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The fifth lens element E5 is made of plastic, and both its object-side and image-side surfaces are aspherical.

[0118] The sixth lens element E6, with negative refractive power, has an object-side surface that is concave in its near-axis region, and an image-side surface that is also concave in its near-axis region. The sixth lens element E6 is made of plastic, and both its object-side and image-side surfaces are aspherical.

[0119] The seventh lens element E7, with negative refractive power, has an object-side surface that is concave in its near-axis region, and an image-side surface that is also concave in its near-axis region. The seventh lens element E7 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the image-side surface of the seventh lens element E7 exhibits an inflection point and a critical point.

[0120] The eighth lens element E8, with negative refractive power, has an object-side surface that is convex near its axial region and an image-side surface that is concave near its axial region. The eighth lens element E8 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the eighth lens element exhibits an inflection point and a critical point, as does the image-side surface of the eighth lens element E8.

[0121] The filter E9 is made of glass and is arranged in sequence between the eighth lens element E8 and the image surface IMG and does not affect the focal length of the imaging lens system.

[0122] The optical data of the second embodiment are shown in Table 2A and the data of the aspherical surfaces are shown in Table 2B below. Table 2A - 2nd embodiment f = 4.47 mm, Fno = 2.80, HFOV = 85.1° Surface No. radius of curvature thickness material index Abbesche number Focal length 0 object infinite infinite 1 Lens 1 20,6159 SHP 1,806 Glass 1,804 46,5 -6,51 2 4,0101 SHP 1,875 3 Lens 2 21,9123 ASP 0,999 plastic 1,661 20,3 -13,91 4 6,3560 ASP 0,148 5 Lens 3 5,1547 SHP 3,489 Glass 1,805 25,5 4,97 6 -12,5058 SPH 0,402 7 Lens 4 -4,0261 ASP 0,394 plastic 1,650 21,8 -14,00 8 -7,5019 ASP 0,472 9 Opening aperture even -0,146 10 Lens 5 3,1009 ASP 1,114 plastic 1,544 56,0 3,59 11 -4,6090 ASP 0,040 12 Lens 6 -26,5751 ASP 0,760 plastic 1,669 19,5 -10,10 13 9,1695 ASP 0,280 14 Aperture even 1,577 15 Lens 7 -43,4783 ASP 1,099 plastic 1,544 56,0 -44,93 16 56,3180 ASP 0,507 17 Lens 8 36,4447 ASP 1,356 plastic 1,669 19,5 -18,22 17 8,9990 ASP 0,426 19 filter even 0,210 Glass 1,517 64,2 - 20 even 0,444 21 Picture even - The reference wavelength is 587.6 nm (d-line). The effective radius of surface 14 (aperture S1) is 1.822 mm. Table 2B - Aspheric coefficients Surface No. 3 4 7 8 k= 2.69247E+01 -3.67880E+00 -1.15093E+01 -2.08589E+01 A4 = 4.742694959E-03 1.001114790E-02 5.218665063E-03 1.477628330E-03 A6 = -9.148523298E-04 -1.165084869E-03 -2.422556650E-03 7.158927860E-04 A8 = 1.036647736E-04 2.110224814E-04 9.030250510E-04 1.876093935E-04 A10= -9.682289051E-06 -2.126682208E-05 -7.813012843E-05 8.040392306E-05 A12= -1.893812614E-06 -1.527634299E-05 A14= 4.843829581E-07 5.208353657E-06 A16= -3.577611289E-08 -6.479113462E-07 A18= 7.157037269E-10 3.437243422E-08 A20= 1.387506328E-11 -5.502052652E-10 Surface No. 10 11 12 13 k = -5.82270E+00 2.42949E-01 8.95580E+01 -9.67900E+01 A4 = 8.819507849E-04 -1.023764302E-02 -1.093355535E-02 2.010439703E-02 A6 = 1.130779755E-03 -2.596038326E-02 1.902339790E-02 -6.966662620E-03 A8 = 5.316721686E-04 1.364711001E-01 -1.697085524E-02 5.240289268E-03 A10= -2.606529468E-03 -3.031830693E-01 9.871636734E-03 -2.995760627E-03 A12= 1.746387853E-03 3.945027242E-01 -3.837633772E-03 1.220667258E-03 A14= -4.262191223E-04 -3.253838622E-01 8.409628763E-04 -3.415593339E-04 A16= 1.717299905E-01 -7.653588442E-05 5.665774639E-05 A18= -5.619789553E-02 -4.069318745E-06 A20= 1.038425748E-02 A22= -8.282262961E-04 Surface No. 15 16 17 18 k = 3.68766E+01 9.90000E+01 -9.90000E+01 -9.17757E+00 A4 = -1.089097853E-02 1.249040531E-03 8.823483115E-03 3.164672600E-02 A6 = 1.482553002E-02 3.436903520E-03 -1.955808274E-02 -3.047043618E-02 A8 = -1.452120438E-02 -1.622964088E-03 1.207573494E-02 1.380923464E-02 A10= 8.111626680E-03 2.992716907E-04 -4.644688481E-03 -4.084325856E-03 A12= -3.024165341E-03 -2.872459760E-05 1.244794558E-03 8.438177247E-04 A14= 7.642312093E-04 1.322835853E-06 -2.441128410E-04 -1.253328246E-04 A16= -1.283209945E-04 -6.101531092E-09 3.548163900E-05 1.356227342E-05 A18= 1.361537925E-05 -1.804323502E-09 -3.812382196E-06 -1.073865196E-06 A20= -8.224179374E-07 4.907776338E-11 3.001016461E-07 6.198821852E-08 A22= 2.147368978E-08 -1.702999752E-08 -2.573424368E-09 A24= 6.765971427E-10 7.470433878E-11 A26= -1.782450964E-11 -1.437520266E-12 A28= 2.791120431E-13 1.645902011E-14 A30= -1.961076387E-15 -8.482219501E-17

[0123] In the second embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the first embodiment. The definitions of the parameters listed in the following table are also the same as in the first embodiment, with the corresponding values ​​for the second embodiment, so their explanations are not repeated.

[0124] Furthermore, these parameters from Table 2A and Table 2B can be calculated to yield the following values ​​and have the values ​​shown in Table 2C: Table 2C - 2nd embodiment f [mm] 4,47 |f2 / f4| 0,99 Fno 2,80 |f6 / f8| 0,55 HFOV [°] 85,1 f / f78 -0,36 FOV [°] 170,1 f123 / f567 3,82 TL / ImgH 2,71 Dr1rs / f 2,15 10×BL / / ImgH 1,69 ΣCT / ΣAT 2,14 SL / TL 0,44 T12 / T67 1,01 CTmax / f 0,78 BL / CT3 0,31 ImgH / f 1,43 Dr3r6 / Dr9r12 2,42 TD / f 3,62 |R2 / R4| 0,63 1 0×BL / f 2,42 V6 19,5 |f1 / f7| 0,14 V8 19,5 <3. Design>

[0125] Fig. Figure 3A is a schematic view of an image recording apparatus 3 in the 3rd embodiment of the present disclosure. Fig.Figure 3B shows the curves of the spherical aberration, astigmatic field curves, and the distortion curve of the image acquisition device 3 of the third embodiment. Fig.3A The image-taking apparatus 3 comprises an imaging lens system (whose reference numeral has been omitted) and an image sensor IS. The imaging lens system comprises, in order from the object side to the image side along the beam path, a first lens element E1, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture ST, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image area IMG, wherein the image sensor IS is arranged in the image area IMG of the imaging lens system. The imaging lens system comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8), without one or more additional lens elements inserted between the first lens element E1 and the eighth lens element E8.

[0126] The first lens element E1 with negative refractive power has an object-side surface that is convex in its axial region and an image-side surface that is concave in its axial region. The first lens element E1 is made of glass, and both its object-side and image-side surfaces are spherical.

[0127] The second lens element E2, with negative refractive power, has an object-side surface that is convex in its near-axis region and an image-side surface that is concave in its near-axis region. The second lens element E2 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the second lens element E2 has an inflection point and a critical point.

[0128] The third lens element E3, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The third lens element E3 is made of glass, and both its object-side and image-side surfaces are spherical.

[0129] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in its near-axis region and an image-side surface that is convex in its near-axis region. The fourth lens element E4 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the fourth lens element E4 has an inflection point, and the image-side surface of the fourth lens element E4 also has an inflection point.

[0130] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The fifth lens element E5 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the fifth lens element E5 has an inflection point.

[0131] The sixth lens element E6, with negative refractive power, has an object-side surface that is convex in its near-axis region and an image-side surface that is concave in its near-axis region. The sixth lens element E6 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the sixth lens element E6 exhibits an inflection point and a critical point.

[0132] The seventh lens element E7, with negative refractive power, has an object-side surface that is convex near its axial region and an image-side surface that is concave near its axial region. The seventh lens element E7 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the seventh lens element E7 has an inflection point and a critical point, and the image-side surface of the seventh lens element E7 also has an inflection point and a critical point.

[0133] The eighth lens element E8, with negative refractive power, has an object-side surface that is convex near its axial region and an image-side surface that is concave near its axial region. The eighth lens element E8 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the eighth lens element exhibits three inflection points and one critical point, while the image-side surface of the eighth lens element E8 exhibits one inflection point and one critical point.

[0134] The filter E9 is made of glass and is arranged in sequence between the eighth lens element E8 and the image surface IMG and does not affect the focal length of the imaging lens system.

[0135] The optical data of the 3rd embodiment are shown in Table 3A and the data of the aspherical surfaces are shown in Table 3B below. Table 3A - 3. Design f = 4.35 mm, Fno = 2.80, HFOV = 74.6° Surface No. radius of curvature thickness material index Abbesche number Focal length 0 object infinite infinite 1 Lens 1 20,1393 SHP 1,547 Glass 1,804 46,5 -6,24 2 3,8779 SHP 1,866 3 Lens 2 20,9140 ASP 0,986 plastic 1,669 19,5 -17,55 4 7,3775 ASP 0,135 5 Lens 3 5,6914 SHP 3,556 Glass 1,805 25,5 5,46 6 -13,8798 SPH 0,419 7 Lens 4 -4,1599 ASP 0,384 plastic 1,642 22,5 -14,75 8 -7,6899 ASP 0,486 9 Opening aperture even -0,153 10 Lens 5 3,1771 ASP 1,083 plastic 1,544 56,0 3,99 11 -6,0275 ASP 0,040 12 Lens 6 22,2028 ASP 0,760 plastic 1,697 16,3 -14,11 13 6,7195 ASP 1,833 14 Lens 7 35,0298 ASP 1,091 plastic 1,544 56,0 -552,75 15 31,0307 ASP 0,588 16 Lens 8 24,3940 ASP 1,319 plastic 1,669 19,5 -14,85 17 6,9061 ASP 0,237 18 filter even 0,210 Glass 1,517 64,2 - 19 even 0,686 20 Picture even - The reference wavelength is 587.6 nm (d-line). Table 3B - Aspheric coefficients Surface No. 3 4 7 8 k = 3.00165E+01 -4.77345E+00 -1.21814E+01 -1.84208E+01 A4 = 4.908906731E-03 9.676551519E-03 4.202808135E-03 1.366975321E-03 A6 = -2.148829125E-03 -3.091625605E-03 -1.162462365E-03 1.075508481E-03 A8 = 1.067607809E-03 2.176902190E-03 4.460637021 E-04 6.247210022E-05 A10= -3.812365188E-04 -1.056000144E-03 -1.657874025E-05 5.369891219E-05 A12= 8.327342135E-05 3.126471943E-04 A14= -1.149181234E-05 -5.840149603E-05 A16= 9.744830355E-07 6.702190717E-06 A18= -4.616847787E-08 -4.289682122E-07 A20= 9.326773700E-10 1.168287714E-08 Surface No. 10 11 12 13 k = -5.83918E+00 1.08784E+00 -9.88380E+01 -5.46905E+01 A4 = 8.114757048E-04 -1.398529638E-02 -1.564533770E-02 2.250973991 E-02 A6 = -1.653038382E-03 -3.969634172E-02 2.239073788E-02 -5.976193361E-03 A8 = 8.287152481E-03 2.214416533E-01 -1.820517110E-02 2.092110639E-03 A10= -1.064200086E-02 -5.078574038E-01 8.711737956E-03 -9.490038120E-04 A12= 5.579043137E-03 6.695310357E-01 -2.634632151 E-03 6.297614804E-04 A14= -1.118823121 E-03 -5.493280155E-01 4.848823247E-04 -2.844771087E-04 A16= 2.838625930E-01 -4.466874700E-05 6.435706561 E-05 A18= -8.959435611E-02 -5.711859347E-06 A20= 1.572708282E-02 A22= -1.172625242E-03 Surface No. 14 15 16 17 k = -6.90863E+01 4.69554E+01 -9.90000E+01 -1.58292E+01 A4 = -1.044262525E-02 1.990830121E-03 3.720503839E-03 2.925782360E-02 A6 = 1.120107108E-02 2.945896708E-03 -9.822448441 E-03 -2.907425985E-02 A8 = -8.407207247E-03 -1.509893672E-03 3.545205005E-03 1.355239856E-02 A10= 3.362648604E-03 2.938667860E-04 -2.363978580E-04 -4.124373778E-03 A12= -8.383625092E-04 -3.087623460E-05 -2.411429407E-04 8.757211095E-04 A14= 1.302545325E-04 1.789864016E-06 1.011978791E-04 -1.332636819E-04 A16= -1.147174877E-05 -4.875323537E-08 -2.156130272E-05 1.471584242E-05 A18= 3.601853116E-07 1.220603854E-10 2.987589463E-06 -1.184528821E-06 A20= 1.999241006E-08 1.423959694E-11 -2.865786996E-07 6.929194522E-08 A22= -1.437727140E-09 1.926142116E-08 -2.908486594E-09 A24= -8.923695136E-10 8.523892317E-11 A26= 2.717933616E-11 -1.654576316E-12 A28= -4.901585183E-13 1.910386716E-14 A30= 3.967564108E-15 -9.928627379E-17

[0136] In the third embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the first embodiment. The definitions of the parameters listed in the following table are also the same as in the first embodiment, with the corresponding values ​​for the third embodiment, so their explanations are not repeated.

[0137] Furthermore, these parameters from Table 3A and Table 3B can be calculated to yield the following values ​​and have the values ​​shown in Table 3C: Table 3C - 3. Design f [mm] 4,35 |f2 / f4| 1,19 Fno 2,80 |f6 / f8| 0,95 HFOV [°] 74,6 f / f78 -0,30 FOV [°] 149,2 f123 / f567 5,42 TL / ImgH 2,79 Dr1rs / f 2,16 10×BL / / ImgH 1,85 ΣCT / ΣAT 2,06 SL / TL 0,45 T12 / T67 1,02 CTmax / f 0,82 BL / CT3 0,32 ImgH / f 1,41 Dr3r6 / Dr9r12 2,48 TD / f 3,67 |R2 / R4| 0,53 1 0×BL / f 2,61 V6 16,3 |f1 / f7| 0,01 V8 19,5 <4. Design>

[0138] Fig. Figure 4A is a schematic view of an image recording apparatus 4 in the 4th embodiment of the present disclosure. Fig.Figure 4B shows the curves of the spherical aberration, astigmatic field curves, and the distortion curve of the image acquisition device 4 of the 4th embodiment. Fig.4A The image-taking apparatus 4 comprises an imaging lens system (whose reference numeral has been omitted) and an image sensor IS. The imaging lens system comprises, in order from the object side to the image side along the beam path, a first lens element E1, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture ST, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image area IMG, wherein the image sensor IS is arranged in the image area IMG of the imaging lens system. The imaging lens system comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8), without one or more additional lens elements inserted between the first lens element E1 and the eighth lens element E8.

[0139] The first lens element E1 with negative refractive power has an object-side surface that is convex in its near-axis region and an image-side surface that is concave in its near-axis region. The first lens element E1 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the image-side surface of the first lens element E1 has an inflection point.

[0140] The second lens element E2, with negative refractive power, has an object-side surface that is convex in its near-axis region and an image-side surface that is concave in its near-axis region. The second lens element E2 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the second lens element E2 has an inflection point and a critical point.

[0141] The third lens element E3, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The third lens element E3 is made of plastic, and both its object-side and image-side surfaces are aspherical.

[0142] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in its near-axis region and an image-side surface that is convex in its near-axis region. The fourth lens element E4 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the fourth lens element E4 has an inflection point, and the image-side surface of the fourth lens element E4 also has an inflection point.

[0143] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The fifth lens element E5 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the fifth lens element E5 has an inflection point.

[0144] The sixth lens element E6, with negative refractive power, has an object-side surface that is concave in its near-axis region, and an image-side surface that is also concave in its near-axis region. The sixth lens element E6 is made of plastic, and both its object-side and image-side surfaces are aspherical.

[0145] The seventh lens element E7, with positive refractive power, has an object-side surface that is convex in its near-axis region and an image-side surface that is concave in its near-axis region. The seventh lens element E7 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the seventh lens element E7 has an inflection point and a critical point, and the image-side surface of the seventh lens element E7 also has an inflection point and a critical point.

[0146] The eighth lens element E8, with negative refractive power, has an object-side surface that is convex near its axial region and an image-side surface that is concave near its axial region. The eighth lens element E8 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the eighth lens element E8 has an inflection point and a critical point, and the image-side surface of the eighth lens element E8 also has an inflection point and a critical point.

[0147] The filter E9 is made of glass and is arranged in sequence between the eighth lens element E8 and the image surface IMG and does not affect the focal length of the imaging lens system.

[0148] The optical data of the 4th embodiment are shown in Table 4A and the data of the aspherical surfaces are shown in Table 4B below. Table 4A - 4. Design f = 4.44 mm, Fno = 2.80, HFOV = 67.8° Surface No. radius of curvature thickness material index Abbesche number Focal length 0 object infinite infinite 1 Lens 1 19,2091 ASP 1,210 plastic 1,535 55,9 -9,02 2 3,7704 ASP 2,624 3 Lens 2 20,8407 ASP 0,989 plastic 1,661 20,3 -14,03 4 6,2952 ASP 0,268 5 Lens 3 5,3196 ASP 3,458 plastic 1,614 25,56 6,36 6 -11, 0023 ASP 0,366 7 Lens 4 -4,2782 ASP 0,398 plastic 1,587 28,3 -17,06 8 -7,7243 ASP 0,465 9 Opening aperture even -0,129 10 Lens 5 3,2885 ASP 1,161 plastic 1,544 56,0 3,68 11 -4,4890 ASP 0,086 12 Lens 6 -23,6355 ASP 0,833 plastic 1,669 19,5 -9,52 13 8,8453 ASP 2,012 14 Lens 7 35,4312 ASP 1,038 plastic 1,566 37,4 700,80 15 38,4942 ASP 0,588 16 Lens 8 53,6446 ASP 1,133 plastic 1,661 20,3 -13,87 17 7,7608 ASP 0,457 18 filter even 0,210 Glass 1,517 64,2 - 19 even 0,453 20 Picture even - The reference wavelength is 587.6 nm (d-line). Table 4B - Aspheric coefficients Surface No. 1 2 3 4 k= 3.46735E+00 -1.43461 E-01 2.80817E+01 -3.30227E+00 A4 = 5.133879252E-05 -8.819413050E-04 3.681352428E-03 8.970547637E-03 A6 = 5.967022048E-06 6.652848761E-04 2.526072385E-04 4.344164845E-04 A8 = -1.099125147E-08 -2.013430425E-04 -4.504405077E-04 -7.739487802E-04 A10= -4.697263256E-09 4.269709875E-05 1.233720785E-04 2.606561207E-04 A12= -3.098736099E-10 -6.078523628E-06 -1.912064799E-05 -4.366421411E-05 A14= 1.923788585E-11 5.343744728E-07 1.712228976E-06 1.867986876E-06 A16= -3.458032891E-13 -2.555870338E-08 -8.479502059E-08 4.642054071 E-07 A18= 2.152420451E-15 4.896862607E-10 2.057192934E-09 -6.734951903E-08 A20= -1.677429974E-11 2.704720418E-09 Surface No. 5 6 7 8 k = -1.90758E-01 1.24616E+00 -1.19749E+01 -1.67664E+01 A4 = -1.369879330E-04 6.452656385E-04 6.353302480E-03 1.411541069E-03 A6 = 3.368378935E-05 -4.660885337E-04 -3.510651421E-03 1.320880673E-04 A8 = 2.711738258E-06 6.545724623E-05 1.329347411E-03 5.812557888E-04 A10= -3.250218079E-06 5.789175622E-06 -1.293352447E-04 6.286685765E-06 A12= 2.784912719E-07 -1.393675720E-06 Surface No. 10 11 12 13 k = -6.28027E+00 -3.79283E-01 1.72925E+01 -9.90000E+01 A4 = 1.323463956E-04 -9.058125561E-03 -7.649706324E-03 2.037876690E-02 A6 = 5.748938502E-04 -9.964799884E-03 9.587823194E-03 -8.902796696E-03 A8 = 5.671878521E-04 4.761751453E-02 -6.639116193E-03 6.458097414E-03 A10= -1.896617896E-03 -9.264523243E-02 3.291103898E-03 -3.445988698E-03 A12= 1.160176545E-03 1.047132987E-01 -1.226300603E-03 1.257011002E-03 A14= -2.652426228E-04 -7.470417181E-02 2.525132127E-04 -3.002177143E-04 A16= 3.383226890E-02 -1.973116231E-05 4.139006494E-05 A18= -9.416644930E-03 -2.448978714E-06 A20= 1.466923655E-03 A22= -9.783467009E-05 Surface No. 14 15 16 17 k = 9.28754E+01 5.89968E+01 -6.83281E+01 -1.04902E+01 A4 = -4.793928545E-03 6.653356809E-03 8.473246977E-03 3.513383506E-02 A6 = 3.434778734E-03 -6.722976914E-04 -1.784566464E-02 -3.340700782E-02 A8 = -3.483817251E-03 -2.837592677E-06 1.092940079E-02 1.487946556E-02 A10= 1.514899603E-03 -7.743975773E-05 -4.386527825E-03 -4.255094444E-03 A12= -4.015559470E-04 2.556455089E-05 1.314090815E-03 8.421372346E-04 A14= 6.697422366E-05 -3.519262349E-06 -3.043267496E-04 -1.193320381E-04 A16= -6.839055281E-06 2.509614422E-07 5.330094693E-05 1.229430416E-05 A18= 3.822333255E-07 -9.159298163E-09 -6.861831678E-06 -9.253748847E-07 A20= -7.933332211E-09 1.353501154E-10 6.366187572E-07 5.069490616E-08 A22= -8.326472719E-11 -4.180229185E-08 -1.993822616E-09 A24= 1.889992664E-09 5.472999453E-11 A26= -5.590452880E-11 -9.938955605E-13 A28= 9.734798827E-13 1.071703692E-14 A30= -7.565683881E-15 -5.189934337E-17

[0149] In the fourth embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the first embodiment. The definitions of the parameters listed in the following table are also the same as in the first embodiment, with the corresponding values ​​for the fourth embodiment, so their explanations are not repeated.

[0150] Furthermore, these parameters from Table 4A and Table 4B can be calculated to yield the following values ​​and have the values ​​shown in Table 4C: Table 4C - 4. Design f [mm] 4,44 |f2 / f4| 0,82 Fno 2,80 |f6 / f8| 0,69 HFOV [°] 67,8 f / f78 -0,31 FOV [°] 135,5 f123 / f567 6,13 TL / lmgH 2,87 Dr1rs / f 2,20 10×BL / / ImgH 1,83 ΣCT / ΣAT 1,63 SL / TL 0,45 T12 / T67 1,30 CTmax / f 0,78 BL / CT3 0,32 ImgH / f 1,38 Dr3r6 / Dr9r12 2,27 TD / f 3,72 |R2 / R4| 0,60 1 0×BL / f 2,52 V6 19,5 |f1 / f7| 0,01 V8 20,3 <5. Design>

[0151] Fig. 5A is a schematic view of an image recording apparatus 5 in the 5th embodiment of the present disclosure. Fig.Figure 5B shows the spherical aberration curves, astigmatic field curves, and the distortion curve of the image acquisition device 5 of the 5th embodiment. Fig.In 5A, the image-taking apparatus 5 comprises an imaging lens system (whose reference numeral has been omitted) and an image sensor IS. The imaging lens system comprises, in order from the object side to the image side along the beam path, a first lens element E1, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture ST, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image area IMG, wherein the image sensor IS is arranged in the image area IMG of the imaging lens system. The imaging lens system comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8), without one or more additional lens elements inserted between the first lens element E1 and the eighth lens element E8.

[0152] The first lens element E1 with negative refractive power has an object-side surface that is concave in its near-axis region, and an image-side surface that is also concave in its near-axis region. The first lens element E1 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the first lens element E1 has an inflection point and a critical point.

[0153] The second lens element E2, with negative refractive power, has an object-side surface that is convex in its near-axis region and an image-side surface that is concave in its near-axis region. The second lens element E2 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the second lens element E2 has an inflection point and a critical point.

[0154] The third lens element E3, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The third lens element E3 is made of glass, and both its object-side and image-side surfaces are aspherical.

[0155] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in its near-axis region and an image-side surface that is convex in its near-axis region. The fourth lens element E4 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the fourth lens element E4 has an inflection point, and the image-side surface of the fourth lens element E4 also has an inflection point.

[0156] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The fifth lens element E5 is made of plastic, and both its object-side and image-side surfaces are aspherical.

[0157] The sixth lens element E6, with negative refractive power, has an object-side surface that is concave in its near-axis region, and an image-side surface that is also concave in its near-axis region. The sixth lens element E6 is made of plastic, and both its object-side and image-side surfaces are aspherical.

[0158] The seventh lens element E7, with positive refractive power, has an object-side surface that is convex in its near-axis region and an image-side surface that is concave in its near-axis region. The seventh lens element E7 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the seventh lens element E7 has an inflection point and a critical point, and the image-side surface of the seventh lens element E7 also has an inflection point and a critical point.

[0159] The eighth lens element E8, with negative refractive power, has an object-side surface that is convex in its near-axis region and an image-side surface that is concave in its near-axis region. The eighth lens element E8 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the eighth lens element exhibits an inflection point and a critical point, and the image-side surface of the eighth lens element E8 also exhibits an inflection point and a critical point.

[0160] The filter E9 is made of glass and is arranged in sequence between the eighth lens element E8 and the image surface IMG and does not affect the focal length of the imaging lens system.

[0161] The optical data of the 5th embodiment are shown in Table 5A and the data of the aspherical surfaces are shown in Table 5B below. Table 5A - 5. Design f = 4.60 mm, Fno = 2.80, HFOV = 69.7° Surface No. radius of curvature thickness material index Abbesche number Focal length 0 object infinite infinite 1 Lens 1 -76,3359 ASP 1,318 plastic 1,534 56,0 -7,62 2 4,3279 ASP 2,119 3 Lens 2 20,5880 ASP 1,052 plastic 1,639 23,5 -14,60 4 6,2906 ASP 0,176 5 Lens 3 5,1680 ASP 3,511 Glass 1,755 27,5 5,21 6 -11,6920 ASP 0,416 7 Lens 4 -4,2198 ASP 0,409 plastic 1,669 19,5 -15,48 8 -7,3991 ASP 0,378 9 Opening aperture even -0,118 10 Lens 5 3,4044 ASP 1,152 plastic 1,534 56,0 3,89 11 -4,6931 ASP 0,052 12 Lens 6 -27,5594 ASP 0,779 plastic 1,660 20,4 -9,40 13 8,1009 ASP 1,811 14 Lens 7 45,2304 ASP 1,187 plastic 1,551 44,5 1444,84 15 47,5050 ASP 0,555 16 Lens 8 39,8928 ASP 1,364 plastic 1,639 23,5 -13,84 17 7,1375 ASP 0,457 18 filter even 0,210 Glass 1,517 64,2 - 19 even 0,419 20 Picture even - The reference wavelength is 587.6 nm (d-line). Table 5B - Aspheric coefficients Surface No. 1 2 3 4 k = -9.90000E+01 -2.91177E-01 2.69402E+01 -3.86479E+00 A4 = -4.949466807E-05 -1.801432645E-03 2.884251449E-03 7.247776470E-03 A6 = 5.915744487E-05 2.270415287E-03 1.261676714E-03 2.723714188E-03 A8 = -9.284748409E-06 -9.571592629E-04 -8.936608621 E-04 -2.259634317E-03 A10= 8.320532669E-07 2.317007675E-04 2.133746971E-04 7.976465625E-04 A12= -4.531572663E-08 -2.772297008E-05 -2.624897451 E-05 -1.628404788E-04 A14= 1.547353033E-09 -8.050339789E-07 1.322790196E-06 1.866442290E-05 A16= -3.326843373E-11 7.988398422E-07 3.316545985E-08 -1.004909946E-06 A18= 4.373449604E-13 -1.212264550E-07 -6.273288936E-09 5.164838814E-09 A20= -3.209388029E-15 9.122033776E-09 1.874319675E-10 1.161453423E-09 A22= 1.005843935E-17 -3.542363145E-10 A24= 5.674094593E-12 Surface No. 5 6 7 8 k = -1.26478E-01 4.70098E-01 -1.16696E+01 -1.78337E+01 A4 = 2.137689955E-04 1.046459165E-03 6.571060569E-03 1.376511707E-03 A6 = -6.131671658E-05 -4.599542115E-04 -3.871263805E-03 7.075067380E-05 A8 = -8.298402776E-07 -2.269928551E-05 1.468355293E-03 6.702088593E-04 A10= -5.119569056E-07 2.835468304E-05 -1.428560319E-04 -9.801121096E-06 A12= 1.078649772E-07 -2.990362453E-06 Surface No. 10 11 12 13 k= -6.47180E+00 -6.71578E-01 8.11544E+01 -9.68995E+01 A4 = -1.324256860E-03 -4.887675361E-03 -7.844466721 E-03 2.384071627E-02 A6 = 3.153433458E-03 -9.823232994E-03 1.102132177E-02 -2.010006375E-02 A8 = -2.999936050E-03 2.610177949E-02 -1.323190921E-02 2.145756649E-02 A10= 1.945738551E-03 -3.739377303E-02 1.118959291 E-02 -1.576458181E-02 A12= -8.763341318E-04 2.959884484E-02 -5.361624086E-03 7.540093364E-03 A14= 1.481624635E-04 -1.239009081E-02 1.244930027E-03 -2.193622510E-03 A16= 1.820810794E-03 -1.089629971E-04 3.473672812E-04 A18= 4.123753763E-04 -2.281622595E-05 A20= -1.698580032E-04 A22= 1.482927952E-05 Surface No. 14 15 16 17 k= 3.88481E+01 4.10795E+01 3.76845E+01 -1.41369E+01 A4 = -1.657080954E-02 -7.100668500E-04 4.788035383E-03 3.103783078E-02 A6 = 2.259648620E-02 7.303095326E-03 -8.885286408E-03 -2.567102372E-02 A8 = -2.010930901E-02 -3.924859146E-03 1.745396975E-03 9.021698995E-03 A10= 9.895583508E-03 9.554104935E-04 1.224216860E-03 -1.905203561E-03 A12= -3.031354047E-03 -1.333628991E-04 -8.469713037E-04 2.636670612E-04 A14= 5.953054624E-04 1.127214679E-05 2.455031989E-04 -2.462796073E-05 A16= -7.461173953E-05 -5.691485998E-07 -4.255468951 E-05 1.530231637E-06 A18= 5.718242656E-06 1.575227671E-08 4.860277905E-06 -5.746345536E-08 A20= -2.408126056E-07 -1.834020924E-10 -3.789955425E-07 7.235404748E-10 A22= 4.169571779E-09 2.028080673E-08 4.588906851E-11 A24= -7.298903317E-10 -2.887203720E-12 A26= 1.675386012E-11 7.664665603E-14 A28= -2.185066973E-13 -1.047161041E-15 A30= 1.200251975E-15 6.007723836E-18

[0162] In the 5th embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the 1st embodiment. The definitions of the parameters listed in the following table are also the same as in the 1st embodiment, with the corresponding values ​​for the 5th embodiment, so their explanations are not repeated.

[0163] Furthermore, these parameters from Table 5A and Table 5B can be calculated to yield the following values ​​and have the values ​​shown in Table 5C: Table 5C - 5. Design f [mm] 4,60 |f2 / f4| 0,94 Fno 2,80 |f6 / f8| 0,68 HFOV [°] 69,7 f / f78 -0,33 FOV [°] 139,4 f123 / f567 2,64 TL / lmgH 2,83 Dr1rs / f 2,04 10xBL / / lmgH 1,78 ΣCT / ΣAT 2,00 SL / TL 0,46 T12 / T67 1,17 CTmax / f 0,76 BL / CT3 0,31 ImgH / f 1,33 Dr3r6 / Dr9r12 2,39 TD / f 3,51 |R2 / R4| 0,69 1 OxBL / f 2,36 V6 20,4 |f1 / f7| 0,01 V8 23,5 <6. Design>

[0164] Fig. Figure 6A is a schematic view of an image recording apparatus 6 in the 6th embodiment of the present disclosure. Fig.Figure 6B shows the curves of the spherical aberration, astigmatic field curves, and the distortion curve of the image acquisition device 6 of the 6th embodiment. Fig.6A, the image-taking apparatus 6 comprises an imaging lens system (whose reference numeral has been omitted) and an image sensor IS. The imaging lens system comprises, in order from the object side to the image side along the beam path, a first lens element E1, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture ST, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image area IMG, wherein the image sensor IS is arranged in the image area IMG of the imaging lens system. The imaging lens system comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8), without one or more additional lens elements inserted between the first lens element E1 and the eighth lens element E8.

[0165] The first lens element E1 with negative refractive power has an object-side surface that is convex in its axial region and an image-side surface that is concave in its axial region. The first lens element E1 is made of glass, and both its object-side and image-side surfaces are spherical.

[0166] The second lens element E2, with negative refractive power, has an object-side surface that is convex in its near-axis region and an image-side surface that is concave in its near-axis region. The second lens element E2 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the second lens element E2 has an inflection point and a critical point.

[0167] The third lens element E3, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The third lens element E3 is made of glass, and both its object-side and image-side surfaces are spherical.

[0168] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in its near-axis region and an image-side surface that is convex in its near-axis region. The fourth lens element E4 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the fourth lens element E4 has an inflection point, and the image-side surface of the fourth lens element E4 also has an inflection point.

[0169] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The fifth lens element E5 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the fifth lens element E5 has an inflection point.

[0170] The sixth lens element E6, with negative refractive power, has an object-side surface that is concave in its near-axis region, and an image-side surface that is also concave in its near-axis region. The sixth lens element E6 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the image-side surface of the sixth lens element E6 has an inflection point.

[0171] The seventh lens element E7, with negative refractive power, has an object-side surface that is convex near its axial region and an image-side surface that is concave near its axial region. The seventh lens element E7 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the seventh lens element E7 has an inflection point and a critical point, and the image-side surface of the seventh lens element E7 also has an inflection point and a critical point.

[0172] The eighth lens element E8, with negative refractive power, has an object-side surface that is concave in its near-axis region, and an image-side surface that is also concave in its near-axis region. The eighth lens element E8 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the eighth lens element has one inflection point, and the image-side surface of the eighth lens element E8 has three inflection points and one critical point.

[0173] The filter E9 is made of glass and is arranged in sequence between the eighth lens element E8 and the image surface IMG and does not affect the focal length of the imaging lens system.

[0174] The optical data of the 6th embodiment are shown in Table 6A and the data of the aspherical surfaces are shown in Table 6B below. Table 6A - 6. Design f = 4.40 mm, Fno = 2.80, HFOV = 75.3° Surface No. radius of curvature thickness material index Abbesche number Focal length 0 object infinite infinite 1 Lens 1 16,9934 SPH 1,350 Glass 1,804 46,5 -7,04 2 4,0945 SPH 2,126 3 Lens 2 25,1812 ASP 0,941 plastic 1,660 20,4 -12,38 4 6,0782 ASP 0,251 5 Lens 3 5,3378 SPH 3,570 Glass 1,805 25,5 4,97 6 -11,2240 SPH 0,508 7 Lens 4 -3,3581 ASP 0,382 plastic 1,660 20,4 -16,89 8 -5,0237 ASP 0,495 9 Opening aperture even -0,098 10 Lens 5 3,0492 ASP 1,320 plastic 1,544 56,0 3,58 11 -4,5709 ASP 0,040 12 Lens 6 -8,2849 ASP 0,710 plastic 1,660 20,4 -8,44 13 17,6066 ASP 1,305 14 Lens 7 95,1552 ASP 1,355 plastic 1,544 56,0 -146,97 15 43,2299 ASP 0,622 16 Lens 8 -199,9998 ASP 1,300 plastic 1,660 20,4 -11,08 17 7,6059 ASP 0,557 18 filter even 0,210 Glass 1,517 64,2 - 19 even 0,404 20 Picture even - The reference wavelength is 587.6 nm (d-line). Table 6B - Aspheric coefficients Surface No. 3 4 7 8 k = 3.71008E+01 -2.95310E+00 -7.02536E+00 -5.22139E+00 A4 = 4.812038821E-03 9.502294554E-03 2.228226842E-03 1.905077324E-03 A6 = -4.017455692E-04 -1.222052093E-04 -2.202762164E-03 -7.068397057E-04 A8 = -1.149567981E-04 -4.231248446E-04 7.285303197E-04 3.462011125E-04 A10= 5.065499705E-05 2.084616054E-04 -5.077801622E-05 1.597663162E-05 A12= -1.163858727E-05 -6.188120313E-05 A14= 1.560666369E-06 1.090554750E-05 A16= -1.235790576E-07 -1.128007318E-06 A18= 5.407574518E-09 6.410720286E-08 A20= -1.011060086E-10 -1.552132019E-09 Surface No. 10 11 12 13 k = -5.18689E+00 6.49914E-02 0.00000E+00 0.00000E+00 A4 = 3.285599852E-03 -1.546672184E-02 -8.097268988E-03 6.170454946E-03 A6 = 4.831726843E-04 1.029488346E-02 1.273958362E-02 2.633289957E-03 A8 = -1.505346174E-04 -3.008887869E-03 -6.794201696E-03 7.038864286E-05 A10= -1.122472164E-03 -2.714300263E-03 1.501980701E-03 -3.799282020E-03 A12= 7.184109038E-04 -1.248488995E-04 -3.314615530E-04 8.078330516E-03 A14= -1.741800410E-04 3.603389130E-03 1.653923808E-04 -9.342630132E-03 A16= -3.386309991E-03 -3.266948145E-05 6.918935240E-03 A18= 1.495862780E-03 -3.516298145E-03 A20= -3.331641380E-04 1.268247106E-03 A22= 2.972703748E-05 -3.278809633E-04 A24= 5.993063883E-05 A26= -7.389831380E-06 A28= 5.515095239E-07 A30= -1.874217100E-08 Surface No. 14 15 16 17 k = 0.00000E+00 0.00000E+00 0.00000E+00 -2.03014E+01 A4 = -9.785739343E-03 7.662820161E-03 7.161547338E-03 1.559494447E-02 A6 = 9.664284133E-03 -5.078606088E-03 -1.730368443E-02 -1.763003931E-02 A8 = -1.511415370E-02 2.392219702E-03 1.026013702E-02 8.061091113E-03 A10= 1.329057373E-02 -8.255910935E-04 -3.696925786E-03 -2.388104726E-03 A12= -7.658012221E-03 1.837683627E-04 8.898512435E-04 4.983155570E-04 A14= 2.964584939E-03 -2.688089529E-05 -1.472063491E-04 -7.570813631E-05 A16= -7.755261919E-04 2.623717973E-06 1.651182637E-05 8.487248783E-06 A18= 1.357011336E-04 -1.690739220E-07 -1.182849171 E-06 -7.041540185E-07 A20= -1.539082025E-05 6.883365155E-09 4.413100455E-08 4.299691331E-08 A22= 1.057331980E-06 -1.599613913E-10 2.436378566E-10 -1.902698708E-09 A24= -3.810677725E-08 1.616646684E-12 -1.103600822E-10 5.922684390E-11 A26= 4.940986884E-10 5.133844309E-12 -1.227561709E-12 A28= -1.052410642E-13 1.518766794E-14 A30= 8.177707037E-16 -8.476384477E-17

[0175] In the 6th embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the 1st embodiment. The definitions of the parameters listed in the following table are also the same as in the 1st embodiment, with the corresponding values ​​for the 6th embodiment, so their explanations are not repeated.

[0176] Furthermore, these parameters from Table 6A and Table 6B can be calculated to yield the following values ​​and have the values ​​shown in Table 6C: Table 6C - 6. Design f [mm] 4,40 |f2 / f4| 0,73 Fno 2,80 |f6 / f8| 0,76 HFOV [°] 75,3 f / f78 -0,43 FOV [°] 150,6 f123 / f567 2,92 TL / lmgH 2,83 Dr1rs / f 2,19 10xBL / / lmgH 1,91 ΣCT / ΣAT 2,08 SL / TL 0,45 T12 / T67 1,63 CTmax / f 0,81 BL / CT3 0,33 ImgH / f 1,39 Dr3r6 / Dr9r12 2,30 TD / f 3,68 |R2 / R4| 0,67 1 OxBL / f 2,66 V6 20,4 |f1 / f7| 0,05 V8 20,4 <7. Design>

[0177] Fig. Figure 7A is a schematic view of an image recording apparatus 7 in the 7th embodiment of the present disclosure. Fig. Figure 7B shows the spherical aberration curves, astigmatic field curves, and the distortion curve of the image acquisition device 7 of the 7th embodiment. Fig.7A The image-taking apparatus 7 comprises an imaging lens system (whose reference numeral has been omitted) and an image sensor IS. The imaging lens system comprises, in order from the object side to the image side along the optical path, a first lens element E1, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture ST, a fifth lens element E5, a sixth lens element E6, an aperture S1, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image area IMG, wherein the image sensor IS is arranged in the image area IMG of the imaging lens system. The imaging lens system comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8), without one or more additional lens elements inserted between the first lens element E1 and the eighth lens element E8.

[0178] The first lens element E1 with negative refractive power has an object-side surface that is convex in its near-axis region and an image-side surface that is concave in its near-axis region. The first lens element E1 is made of glass, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the first lens element E1 has an inflection point.

[0179] The second lens element E2, with negative refractive power, has an object-side surface that is convex in its near-axis region and an image-side surface that is concave in its near-axis region. The second lens element E2 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the second lens element E2 has an inflection point and a critical point.

[0180] The third lens element E3, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The third lens element E3 is made of glass, and both its object-side and image-side surfaces are aspherical. Furthermore, the image-side surface of the third lens element E3 has an inflection point.

[0181] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in its near-axis region and an image-side surface that is convex in its near-axis region. The fourth lens element E4 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the fourth lens element E4 has an inflection point, and the image-side surface of the fourth lens element E4 has an inflection point and a critical point.

[0182] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The fifth lens element E5 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the fifth lens element E5 has an inflection point.

[0183] The sixth lens element E6, with negative refractive power, has an object-side surface that is concave in its near-axis region, and an image-side surface that is also concave in its near-axis region. The sixth lens element E6 is made of plastic, and both its object-side and image-side surfaces are aspherical.

[0184] The seventh lens element E7, with negative refractive power, has an object-side surface that is convex near its axial region and an image-side surface that is concave near its axial region. The seventh lens element E7 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the seventh lens element E7 has an inflection point and a critical point, and the image-side surface of the seventh lens element E7 also has an inflection point and a critical point.

[0185] The eighth lens element E8, with negative refractive power, has an object-side surface that is convex near its axial region and an image-side surface that is concave near its axial region. The eighth lens element E8 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the eighth lens element exhibits two inflection points and one critical point, and the image-side surface of the eighth lens element E8 exhibits one inflection point and one critical point.

[0186] The filter E9 is made of glass and is arranged in sequence between the eighth lens element E8 and the image surface IMG and does not affect the focal length of the imaging lens system.

[0187] The optical data of the 7th embodiment are shown in Table 7A and the data of the aspherical surfaces are shown in Table 7B below. Table 7A - 7. Design f = 4.28 mm, Fno = 2.60, HFOV = 84.9° Surface No. radius of curvature thickness material index Abbesche number Focal length 0 object infinite infinite 1 Lens 1 20,8771 ASP 1,717 Glass 1,804 46,5 -6,35 2 3,9535 ASP 2,076 3 Lens 2 21,1874 ASP 1,001 plastic 1,661 20,3 -14,01 4 6,3214 ASP 0,147 5 Lens 3 5,1366 ASP 3,565 Glass 1,805 25,5 4,98 6 -12,5806 ASP 0,399 7 Lens 4 -4,0665 ASP 0,396 plastic 1,650 21,8 -14,04 8 -7,6181 ASP 0,491 9 Opening aperture even -0,153 10 Lens 5 3,2205 ASP 1,163 plastic 1,544 56,0 3,69 11 -4,6478 ASP 0,040 12 Lens 6 -29,3719 ASP 0,750 plastic 1,669 19,5 -10,24 13 9,0244 ASP 0,300 14 Aperture even 1,422 15 Lens 7 45,4553 ASP 1,064 plastic 1,567 37,4 -120,39 16 27,0456 ASP 0,616 17 Lens 8 19,6078 ASP 1,300 plastic 1,669 19,5 -16,07 18 6,7581 ASP 0,806 19 filter even 0,210 Glass 1,517 64,2 - 20 even 0,151 21 Picture even - The reference wavelength is 587.6 nm (d-line). The effective radius of surface 14 (aperture S1) is 1.922 mm. Table 7B - Aspheric coefficients Surface No. 1 2 3 4 k = 1.35900E+00 -3.29420E-02 3.29200E+01 -3.77180E+00 A4 = -8.290265432E-05 -7.442658987E-04 2.792239179E-03 7.626301530E-03 A6 = 1.395539348E-05 5.137727889E-04 1.297930355E-03 2.037592254E-03 A8 = -7.292050723E-07 -9.991808009E-05 -9.973946070E-04 -1.904521966E-03 A10= 1.655387339E-08 8.695969907E-06 2.910082897E-04 7.497287062E-04 A12= -1.393625603E-10 -2.965994228E-07 -5.231746653E-05 -1.832737522E-04 A14= 5.957113062E-06 2.798492658E-05 A16= -4.208968128E-07 -2.573134297E-06 A18= 1.695826176E-08 1.304740404E-07 A20= -2.986142825E-10 -2.800242799E-09 Surface No. 5 6 7 8 k = -1.11894E-02 -3.73507E-01 -1.16267E+01 -2.04503E+01 A4 = -2.461362575E-05 5.401879679E-04 5.423412013E-03 1.596694343E-03 A6 = 9.884452158E-05 -2.207620681E-04 -2.513167676E-03 5.511408795E-04 A8 = -3.234726517E-05 -4.66135927E-06 8.291808337E-04 1.966814066E-04 A10= 3.689664479E-06 5.905414398E-06 -4.978101141E-05 7.392921472E-05 A12= -1.516526412E-07 1.183359418E-07 Surface No. 10 11 12 13 k = -6.26086E+00 9.10885E-02 8.95654E+01 -9.90000E+01 A4 = 2.019392370E-04 -1.389993096E-02 -1.444800829E-02 1.946727596E-02 A6 = 5.429252665E-04 -8.649404344E-03 2.428088542E-02 -9.097855085E-03 A8 = 1.385469763E-03 7.286674801E-02 -2.157347275E-02 8.137793228E-03 A10= -3.040736643E-03 -1.510275635E-01 1.238428050E-02 -5.318825184E-03 A12= 1.723815979E-03 1.703447106E-01 -4.543919578E-03 2.329312668E-03 A14= -3.664781719E-04 -1.187923468E-01 9.230594683E-04 -6.390415441E-04 A16= 5.232913379E-02 -7.859001883E-05 9.692136323E-05 A18= -1.418647949E-02 -6.127011848E-06 A20= 2.163231963E-03 A22= -1.424477494E-04 Surface No. 15 16 17 18 k = 9.88818E+01 4.03142E+01 -9.90000E+01 -1.23404E+01 A4 = -5.769544683E-03 4.309043143E-03 1.732762448E-03 2.349165186E-02 A6 = 6.961369175E-03 2.727290991 E-03 -6.861161279E-03 -2.201123296E-02 A8 = -6.340701593E-03 -1.961557110E-03 2.673279983E-03 9.679997598E-03 A10= 2.604155227E-03 4.618772768E-04 -4.555629070E-04 -2.885084520E-03 A12= -6.207385248E-04 -5.736806365E-05 3.101201975E-05 6.186497259E-04 A14= 8.738940449E-05 3.986229480E-06 -8.813902283E-06 -9.657784919E-05 A16= -6.652709174E-06 -1.449640066E-07 4.609892691E-06 1.097815989E-05 A18= 1.488924959E-07 2.038292588E-09 -1.087162617E-06 -9.067216876E-07 A20= 1.367686612E-08 5.196270607E-12 1.443548491E-07 5.410368294E-08 A22= -8.078343700E-10 -1.198292184E-08 -2.301258008E-09 A24= 6.399322189E-10 6.790651156E-11 A26= -2.149040914E-11 -1.319376895E-12 A28= 4.147813140E-13 1.516633554E-14 A30= -3.520085521E-15 -7.809286179E-17

[0188] In the 7th embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the 1st embodiment. The definitions of the parameters listed in the following table are also the same as in the 1st embodiment, with the corresponding values ​​for the 7th embodiment, so their explanations are not repeated.

[0189] Furthermore, these parameters from Table 7A and Table 7B can be calculated to yield the following values ​​and have the values ​​shown in Table 7C: Table 7C - 7. Design f [mm] 4,28 |f2 / f4| 1,00 Fno 2,60 |f6 / f8| 0,64 HFOV [°] 84,9 f / f78 -0,30 FOV [°] 169,9 f123 / f567 3,58 TL / lmgH 2,74 Dr1rs / f 2,29 10xBL / / lmgH 1,83 ΣCT / ΣAT 2,05 SL / TL 0,44 T12 / T67 1,21 CTmax / f 0,83 BL / CT3 0,33 ImgH / f 1,49 Dr3r6 / Dr9r12 2,41 TD / f 3,81 |R2 / R4| 0,63 1 OxBL / f 2,73 V6 19,5 |f1 / f7| 0,05 V8 19,5 <8. Design>

[0190] Fig. Figure 8A is a schematic view of an image recording apparatus 8 in the 8th embodiment of the present disclosure. Fig.Figure 8B shows the spherical aberration curves, astigmatic field curves, and the distortion curve of the image acquisition device 8 of the 8th embodiment. Fig.In 8A, the image-taking apparatus 8 comprises an imaging lens system (whose reference numeral has been omitted) and an image sensor IS. The imaging lens system comprises, in order from the object side to the image side along the beam path, a first lens element E1, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture ST, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image area IMG, wherein the image sensor IS is arranged in the image area IMG of the imaging lens system. The imaging lens system comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8), without one or more additional lens elements inserted between the first lens element E1 and the eighth lens element E8.

[0191] The first lens element E1 with negative refractive power has an object-side surface that is convex in its near-axis region and an image-side surface that is concave in its near-axis region. The first lens element E1 is made of glass, and both its object-side and image-side surfaces are aspherical.

[0192] The second lens element E2, with negative refractive power, has an object-side surface that is convex in its near-axis region and an image-side surface that is concave in its near-axis region. The second lens element E2 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the second lens element E2 has an inflection point and a critical point.

[0193] The third lens element E3, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The third lens element E3 is made of glass, and both its object-side and image-side surfaces are aspherical.

[0194] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in its near-axis region and an image-side surface that is convex in its near-axis region. The fourth lens element E4 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the fourth lens element E4 has an inflection point, and the image-side surface of the fourth lens element E4 has an inflection point and a critical point.

[0195] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The fifth lens element E5 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the fifth lens element E5 has an inflection point.

[0196] The sixth lens element E6, with negative refractive power, has an object-side surface that is concave in its near-axis region, and an image-side surface that is also concave in its near-axis region. The sixth lens element E6 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the image-side surface of the sixth lens element E6 has an inflection point.

[0197] The seventh lens element E7, with negative refractive power, has an object-side surface that is convex near its axial region and an image-side surface that is concave near its axial region. The seventh lens element E7 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the seventh lens element E7 has an inflection point and a critical point, and the image-side surface of the seventh lens element E7 also has an inflection point and a critical point.

[0198] The eighth lens element E8, with negative refractive power, has an object-side surface that is convex near its axial region and an image-side surface that is concave near its axial region. The eighth lens element E8 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the eighth lens element exhibits two inflection points and one critical point, and the image-side surface of the eighth lens element E8 exhibits one inflection point and one critical point.

[0199] The filter E9 is made of glass and is arranged in sequence between the eighth lens element E8 and the image surface IMG and does not affect the focal length of the imaging lens system.

[0200] The optical data of the 8th embodiment are shown in Table 8A and the data of the aspherical surfaces are shown in Table 8B below. Table 8A - 8. Design f = 4.21 mm, Fno = 2.80, HFOV = 86.5° Surface No. radius of curvature thickness material index Abbesche number Focal length 0 object infinite infinite 1 Lens 1 18,1246 ASP 1,417 Glass 1,803 46,8 -6,19 2 3,7629 ASP 2,182 3 Lens 2 21,3411 ASP 0,962 plastic 1,661 20,3 -13,32 4 6,1193 ASP 0,153 5 Lens 3 5,0747 ASP 3,565 Glass 1,805 25,5 4,85 6 -11,6732 ASP 0,400 7 Lens 4 -3,9699 ASP 0,401 plastic 1,642 22,5 -13,12 8 -7,8082 ASP 0,494 9 Opening aperture even -0,148 10 Lens 5 3,1558 ASP 1,114 plastic 1,544 56,0 3,59 11 -4,4728 ASP 0,041 12 Lens 6 -24,3794 ASP 0,760 plastic 1,669 19,5 -9,63 13 8,8653 ASP 1,752 14 Lens 7 58,5488 ASP 1,060 plastic 1,544 56,0 -182,53 15 36,5974 ASP 0,653 16 Lens 8 86,1332 ASP 1,261 plastic 1,656 21,3 -15,57 17 9,0812 ASP 0,457 18 filter even 0,210 Glass 1,517 64,2 - 19 even 0,459 20 Picture even - The reference wavelength is 587.6 nm (d-line). Table 8B - Aspheric coefficients Surface No. 1 2 3 4 k= 1.70661E-01 -2.89938E-02 3.37109E+01 -3.62260E+00 A4 = 1.855128935E-05 -5.306235519E-04 3.143186626E-03 8.135971318E-03 A6 = -1.260591274E-08 3.792371659E-04 9.090837418E-04 1.372403176E-03 A8 = -1.726153281E-08 -7.927765703E-05 -8.533829669E-04 -1.507307839E-03 A10= 5.575603402E-10 7.160156271E-06 2.652884347E-04 6.346801621E-04 A12= -5.574282351E-12 -2.497855310E-07 -5.005577752E-05 -1.661163241E-04 A14= 5.861059988E-06 2.681601478E-05 A16= -4.148056819E-07 -2.557556495E-06 A18= 1.624162055E-08 1.311106559E-07 A20= -2.695311051E-10 -2.740615437E-09 Surface No. 5 6 7 8 k = 9.03828E-03 -1.54924E+00 -1.11783E+01 -2.22115E+01 A4 = -2.127298510E-04 5.488822290E-04 5.310667296E-03 1.946138845E-03 A6 = 1.589273722E-04 -2.132271991E-04 -2.823502429E-03 1.103417937E-04 A8 = -3.464753314E-05 -5.870254945E-06 1.097327259E-03 5.573211143E-04 A10= 2.768450576E-06 1.244799761E-05 -1.036069848E-04 1.117364059E-05 A12= -6.349929192E-08 -1.173251904E-06 Surface No. 10 11 12 13 k = -5.98414E+00 2.83528E-01 8.32646E+01 -9.90000E+01 A4 = 1.253595192E-03 -1.148138351 E-02 -1.248194568E-02 2.055903564E-02 A6 = -2.691002986E-04 -1.692517341 E-02 2.095730192E-02 -8.157770189E-03 A8 = 2.312270592E-03 1.049545105E-01 -1.958545983E-02 6.058559093E-03 A10= -4.163460868E-03 -2.350183786E-01 1.253602748E-02 -3.272195051E-03 A12= 2.454063016E-03 2.991791735E-01 -5.476207357E-03 1.242851348E-03 A14= -5.644672232E-04 -2.379356407E-01 1.353722210E-03 -3.325326907E-04 A16= 1.195083934E-01 -1.387260348E-04 5.529789340E-05 A18= -3.671716788E-02 -4. 149834300E-06 A20= 6.275192383E-03 A22= -4.550086594E-04 Surface No. 14 15 16 17 k = 9.90000E+01 8.20517E+01 9.90000E+01 -1.03250E+01 A4 = -4.608493312E-03 5.746981231E-03 3.071619234E-03 2.289021018E-02 A6 = 4.578243020E-03 9.346960101E-04 -8.578527232E-03 -2.086852857E-02 A8 = -5.276205152E-03 -1.225291616E-03 3.838418358E-03 8.686216194E-03 A10= 2.723834497E-03 3.252036837E-04 -8.109608761E-04 -2.374008287E-03 A12= -8.857297501E-04 -4.626569830E-05 1.341497944E-05 4.566413536E-04 A14= 1.902677638E-04 3.948862841E-06 3.808061014E-05 -6.366599177E-05 A16= -2.674687990E-05 -2.013687167E-07 -1.120076956E-05 6.516553894E-06 A18= 2.328868347E-06 5.633395376E-09 1.786411533E-06 -4.911282996E-07 A20= -1.112242650E-07 -6.669088698E-11 -1.857150530E-07 2.710269394E-08 A22= 2.131825267E-09 1.312166070E-08 -1.078181791E-09 A24= -6.272008841E-10 3.000415113E-11 A26= 1.946199420E-11 -5.527385245E-13 A28= -3.544255328E-13 6.040981914E-15 A30= 2.878719168E-15 -2.958652799E-17

[0201] In the 8th embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the 1st embodiment. The definitions of the parameters listed in the following table are also the same as in the 1st embodiment, with the corresponding values ​​for the 8th embodiment, so their explanations are not repeated.

[0202] Furthermore, these parameters from Table 8A and Table 8B can be calculated to yield the following values ​​and have the values ​​shown in Table 8C: Table 8C - 8. Design f [mm] 4,21 |f2 / f4| 1,02 Fno 2,80 |f6 / f8| 0,62 HFOV [°] 86,5 f / f78 -0,29 FOV [°] 173,1 f123 / f567 3,27 TL / lmgH 2,70 Dr1rs / f 2,27 10xBL / / lmgH 1,77 ΣCT / ΣAT 1,91 SL / TL 0,44 T12 / T67 1,25 CTmax / f 0,85 BL / CT3 0,32 ImgH / f 1,51 Dr3r6 / Dr9r12 2,44 TD / f 3,82 |R2 / R4| 0,61 1 OxBL / f 2,67 V6 19,5 |f1 / f7| 0,03 V8 21,3 <9. Design>

[0203] Fig. Figure 9A is a schematic view of an image recording apparatus 9 in the 9th embodiment of the present disclosure. Fig.Figure 9B shows the curves of the spherical aberration, astigmatic field curves, and the distortion curve of the image acquisition device 9 of the 9th embodiment. Fig.9A The image-taking apparatus 9 comprises an imaging lens system (whose reference numeral has been omitted) and an image sensor IS. The imaging lens system comprises, in order from the object side to the image side along the beam path, a first lens element E1, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture ST, a fifth lens element E5, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image area IMG, wherein the image sensor IS is arranged in the image area IMG of the imaging lens system. The imaging lens system comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8), without one or more additional lens elements inserted between the first lens element E1 and the eighth lens element E8.

[0204] The first lens element E1 with negative refractive power has an object-side surface that is convex in its axial region and an image-side surface that is concave in its axial region. The first lens element E1 is made of glass, and both its object-side and image-side surfaces are spherical.

[0205] The second lens element E2, with negative refractive power, has an object-side surface that is convex in its near-axis region and an image-side surface that is concave in its near-axis region. The second lens element E2 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the second lens element E2 has an inflection point and a critical point.

[0206] The third lens element E3, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The third lens element E3 is made of glass, and both its object-side and image-side surfaces are spherical.

[0207] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in its near-axis region and an image-side surface that is convex in its near-axis region. The fourth lens element E4 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the fourth lens element E4 has an inflection point, and the image-side surface of the fourth lens element E4 has an inflection point and a critical point.

[0208] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The fifth lens element E5 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the fifth lens element E5 has an inflection point.

[0209] The sixth lens element E6, with negative refractive power, has an object-side surface that is concave in its near-axis region, and an image-side surface that is also concave in its near-axis region. The sixth lens element E6 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the image-side surface of the sixth lens element E6 has an inflection point.

[0210] The seventh lens element E7, with negative refractive power, has an object-side surface that is concave in its near-axis region and an image-side surface that is convex in its near-axis region. The seventh lens element E7 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the image-side surface of the seventh lens element E7 exhibits two inflection points and two critical points.

[0211] The eighth lens element E8, with negative refractive power, has an object-side surface that is concave in its near-axis region, and an image-side surface that is also concave in its near-axis region. The eighth lens element E8 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the eighth lens element exhibits an inflection point, and the image-side surface of the eighth lens element E8 exhibits an inflection point and a critical point.

[0212] The filter E9 is made of glass and is arranged in sequence between the eighth lens element E8 and the image surface IMG and does not affect the focal length of the imaging lens system.

[0213] The optical data of the 9th embodiment are shown in Table 9A and the data of the aspherical surfaces are shown in Table 9B below. Table 9A - 9. Design f = 4.35 mm, Fno = 2.80, HFOV = 83.5° Surface No. radius of curvature thickness material index Abbesche number Focal length 0 object infinite infinite 1 Lens 1 15,9723 SPH 1,492 Glass 1,794 45,4 -6,45 2 3,7200 SPH 2,191 3 Lens 2 21,2817 ASP 0,992 plastic 1,669 19,5 -14,21 4 6,4477 ASP 0,142 5 Lens 3 5,2103 SPH 3,521 Glass 1,805 25,5 5,01 6 -12,4431 SPH 0,413 7 Lens 4 -3,8585 ASP 0,394 plastic 1,639 23,5 -14,03 8 -7,0463 ASP 0,475 9 Opening aperture even -0,139 10 Lens 5 3,1567 ASP 1,211 plastic 1,544 56,0 3,55 11 -4,2973 ASP 0,040 12 Lens 6 -21,6676 ASP 0,760 plastic 1,669 19,5 -9,93 13 9,7125 ASP 1,880 14 Lens 7 -18,6068 ASP 1,139 plastic 1,551 44,5 -43,52 15 -84,5895 ASP 0,483 16 Lens 8 -108,6782 ASP 1,258 plastic 1,680 18,2 -15,94 17 12,0944 ASP 0,715 18 filter even 0,210 Glass 1,517 64,2 - 19 even 0,090 20 Picture even - The reference wavelength is 587.6 nm (d-line). Table 9B - Aspheric coefficients Surface No. 3 4 7 8 k = 3.41026E+01 -4.02178E+00 -1.09941E+01 -2.05317E+01 A4 = 4.286796982E-03 9.622584010E-03 4.438383181E-03 1.328759819E-03 A6 = -5.541713949E-04 -9.528724442E-04 -1.821970429E-03 9.668048748E-04 A8 = -1.203203691E-04 2.317301909E-06 7.563008077E-04 1.258417749E-04 A10= 7.830345034E-05 9.866081356E-05 -6.488594581E-05 7.978835170E-05 A12= -2.283774119E-05 -5.397238512E-05 A14= 3.574956788E-06 1.288542282E-05 A16= -3.132033611E-07 -1.590707429E-06 A18= 1.455110821E-08 1.001327566E-07 A20= -2.798131300E-10 -2.534215912E-09 -2.534215912E-09 Surface No. 10 11 12 13 k = -5.92786E+00 4.58240E-02 9.52897E+01 -9.90000E+01 A4 = 8.097854649E-04 -1.298010884E-02 -1.291429231E-02 1.710470489E-02 A6 = 7.293347761 E-04 -1.503434938E-02 2.014416584E-02 -5.119228383E-03 A8 = 1.599423682E-03 9.463084061 E-02 -1.532208200E-02 4.107518341E-03 A10= -3.873410864E-03 -1.992301020E-01 6.689775905E-03 -2.445532580E-03 A12= 2.414104408E-03 2.375646222E-01 -1.874318499E-03 9.681754809E-04 A14= -5.623920465E-04 -1.782917511E-01 3.124405485E-04 -2.509512757E-04 A16= 8.528844326E-02 -2.424309238E-05 3.836684610E-05 A18= -2.517444109E-02 -2.598184902E-06 A20= 4.169046021E-03 A22= -2.959163729E-04 Surface No. 14 15 16 17 k = 7.54679E+00 -9.90000E+01 9.90000E+01 -7.73743E+00 A4 = -9.239328941 E-03 1.835731282E-03 1.215159508E-02 3.106490682E-02 A6 = 8.367376605E-03 1.075369627E-03 -2.505080114E-02 -2.995202003E-02 A8 = -6.755890993E-03 -2.546694291E-04 1.790615363E-02 1.352028992E-02 A10= 2.857829068E-03 -7.993497496E-05 -8.446705196E-03 -3.948787141E-03 A12= -7.532988505E-04 3.315825592E-05 2.821364544E-03 7.969052770E-04 A14= 1.244474444E-04 -4.928580342E-06 -6.796680779E-04 -1.147182854E-04 A16= -1.210285719E-05 3.778804067E-07 1.185885914E-04 1.198793497E-05 A18= 5.370578161E-07 -1.492737970E-08 -1.500461154E-05 -9.164040998E-07 A20= 5.175755246E-09 2.400848223E-10 1.372701823E-06 5.115444114E-08 A22= -1.003241378E-09 -8.976823275E-08 -2.058414747E-09 A24= 4.088418360E-09 5.804407663E-11 A26= -1.231270524E-10 -1.086610983E-12 A28= 2.203145699E-12 1.211058825E-14 A30= -1.772799041E-14 -6.072393820E-17

[0214] In the 9th embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the 1st embodiment. The definitions of the parameters listed in the following table are also the same as in the 1st embodiment, with the corresponding values ​​for the 9th embodiment, so their explanations are not repeated.

[0215] Furthermore, these parameters from Table 9A and Table 9B can be calculated to yield the following values ​​and have the values ​​shown in Table 9C: Table 9C - 9. Design f [mm] 4,35 |f2 / f4| 1,01 Fno 2,80 |f6 / f8| 0,62 HFOV [°] 83,5 f / f78 -0,39 FOV [°] 166,9 f123 / f567 3,46 TL / lmgH 2,71 Dr1rs / f 2,21 10xBL / / lmgH 1,59 ΣCT / ΣAT 1,96 SL / TL 0,44 T12 / T67 1,17 CTmax / f 0,81 BL / CT3 0,29 ImgH / f 1,47 Dr3r6 / Dr9r12 2,31 TD / f 3,74 |R2 / R4| 0,58 1 OxBL / f 2,33 V6 19,5 |f1 / f7| 0,15 V8 18,2 <10. Design>

[0216] Fig. Figure 10A is a schematic view of an image recording apparatus 10 in the 10th embodiment of the present disclosure. Fig. Figure 10B shows the spherical aberration curves, astigmatic field curves, and the distortion curve of the image acquisition device 10 of the 10th embodiment. Fig.In 10A, the image-taking apparatus 10 comprises an imaging lens system (whose reference numeral has been omitted) and an image sensor IS. The imaging lens system comprises, in order from the object side to the image side along the optical path, a first lens element E1, a second lens element E2, an aperture S1, a third lens element E3, a fourth lens element E4, an aperture ST, a fifth lens element E5, an aperture S2, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image area IMG, wherein the image sensor IS is arranged in the image area IMG of the imaging lens system. The imaging lens system comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8), without one or more additional lens elements inserted between the first lens element E1 and the eighth lens element E8.

[0217] The first lens element E1 with negative refractive power has an object-side surface that is convex in its near-axis region and an image-side surface that is concave in its near-axis region. The first lens element E1 is made of plastic, and both its object-side and image-side surfaces are aspherical.

[0218] The second lens element E2, with negative refractive power, has an object-side surface that is convex in its near-axis region and an image-side surface that is concave in its near-axis region. The second lens element E2 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the second lens element E2 has an inflection point and a critical point.

[0219] The third lens element E3, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The third lens element E3 is made of glass, and both its object-side and image-side surfaces are aspherical.

[0220] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in its near-axis region and an image-side surface that is convex in its near-axis region. The fourth lens element E4 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the fourth lens element E4 has an inflection point, and the image-side surface of the fourth lens element E4 also has an inflection point.

[0221] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The fifth lens element E5 is made of plastic, and both its object-side and image-side surfaces are aspherical.

[0222] The sixth lens element E6, with negative refractive power, has an object-side surface that is concave in its near-axis region and an image-side surface that is convex in its near-axis region. The sixth lens element E6 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the image-side surface of the sixth lens element E6 has two inflection points.

[0223] The seventh lens element E7, with negative refractive power, has an object-side surface that is concave in its near-axis region, and an image-side surface that is also concave in its near-axis region. The seventh lens element E7 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the image-side surface of the seventh lens element E7 exhibits an inflection point and a critical point.

[0224] The eighth lens element E8, with negative refractive power, has an object-side surface that is concave in its near-axis region, and an image-side surface that is also concave in its near-axis region. The eighth lens element E8 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the eighth lens element exhibits three inflection points, and the image-side surface of the eighth lens element E8 exhibits one inflection point and one critical point.

[0225] The filter E9 is made of glass and is arranged in sequence between the eighth lens element E8 and the image surface IMG and does not affect the focal length of the imaging lens system.

[0226] The optical data of the 10th embodiment are shown in Table 10A and the data of the aspherical surfaces are shown in Table 10B below. Table 10A - 10. Design f = 4.57 mm, Fno = 2.80, HFOV = 76.0° Surface No. radius of curvature thickness material index Abbesche number Focal length 0 object infinite infinite 1 Lens 1 54,1830 ASP 1,211 plastic 1,535 55,9 -7,60 2 3,7503 ASP 2,032 3 Lens 2 20,3078 ASP 1,032 plastic 1,661 20,3 -14,48 4 6,3693 ASP 0,750 5 Aperture even -0,516 6 Lens 3 5,3246 ASP 3,404 Glass 1,755 27,5 5,29 7 -11,5769 ASP 0,380 8 Lens 4 -4,8515 ASP 0,430 plastic 1,639 23,5 -19,17 9 -8,3153 ASP 0,280 10 Opening aperture even -0,030 11 Lens 5 4,2430 ASP 1,174 plastic 1,535 55,9 4,04 12 -3,9643 ASP -0,095 13 Aperture even 0,190 14 Lens 6 -5,7829 ASP 0,760 plastic 1,669 19,5 -14,46 15 -15,1269 ASP 1,979 16 Lens 7 -29,0605 ASP 1,163 plastic 1,584 28,2 -37,73 17 92,5926 ASP 0,655 18 Lens 8 -142,8571 ASP 1,163 plastic 1,639 23,5 -16,28 19 11,2457 ASP 0,457 20 filter even 0,210 Glass 1,517 64,2 - 21 even 0,397 22 Picture even - The reference wavelength is 587.6 nm (d-line). The effective radius of surface 5 (aperture S1) is 2.681 mm. The effective radius of surface 13 (aperture S2) is 1.313 mm. Table 10B - Aspheric coefficients Surface No. 1 2 3 4 k = 4.34642E+01 -2.63167E-01 2.49852E+01 -4.26450E+00 A4 = 1.538987618E-04 -3.113080208E-03 1.668261270E-03 6.514210351E-03 A6 = 3.630935494E-06 2.374781926E-03 2.976822136E-03 5.067665446E-03 A8 = -2.529856921 E-07 -8.039824275E-04 -1.995955486E-03 -4.562824815E-03 A10= 1.887666342E-08 1.730896668E-04 6.166021422E-04 1.990759491 E-03 A12= -1.106313598E-09 -2.458607428E-05 -1.153628568E-04 -5.294898338E-04 A14= 3.300528200E-11 2.236907607E-06 1.344425180E-05 8.726040645E-05 A16= -4.706997852E-13 -1.159915444E-07 -9.579584201 E-07 -8.657138247E-06 A18= 2.623785000E-15 2.554020091E-09 3.840462142E-08 4.724919260E-07 A20= -6.667806106E-10 -1.086472439E-08 Surface No. 6 7 8 9 k= -8.74759E-02 -3.37657E-01 -1.08804E+01 -2.62530E+01 A4 = -4.978576411E-05 3.094842465E-03 1.256231775E-02 3.927044415E-03 A6 = 7.271009150E-05 -1.850363582E-03 -1.275009205E-02 -6.714381773E-03 A8 = -4.078005647E-05 2.230970248E-04 5.690406197E-03 5.676452948E-03 A10= 5.504927924E-06 4.977027976E-05 -8.361600062E-04 -9.645406797E-04 A12= -2.036739135E-07 -1.066330279E-05 Surface No. 11 12 14 15 k = -7.20159E+00 6.41309E-01 3.54518E+00 6.09436E+01 A4 = -3.028846917E-03 -7.435951781E-05 6.692195380E-04 1.201814146E-02 A6 = 1.835464360E-03 -8.867115464E-02 -6.444834405E-03 -1.063362568E-02 A8 = -1.250262952E-03 3.676809304E-01 1.645059472E-02 1.965509425E-02 A10= 2.594868545E-03 -9.304287903E-01 -1.746049307E-02 -2.001616636E-02 A12= -1.670119086E-03 1.520612043E+00 9.789228551E-03 1.223193668E-02 A14= 2.764245448E-04 -1.626395493E+00 -3.069502741 E-03 -4.395127104E-03 A16= 1.127234145E+00 3.790125266E-04 8.477052871 E-04 A18= -4.870537448E-01 -6.722554439E-05 A20= 1.190822421E-01 A22= -1.257160381E-02 Surface No. 16 17 18 19 k = 7.50517E+01 -9.70695E+01 -4.36230E+01 -8.89264E+00 A4 = -9.833408229E-03 5.610496860E-03 1.093170503E-02 5.096974851 E-02 A6 = 1.812339914E-02 1.861514813E-03 -2.095402371E-02 -4.344794282E-02 A8 = -2.102258006E-02 -1.682528386E-03 9.493691430E-03 1.671161774E-02 A10= 1.283062744E-02 4.285594734E-04 -1.312853391E-03 -3.849485416E-03 A12= -4.880455982E-03 -5.912719171E-05 -4.472475462E-04 5.702721685E-04 A14= 1.203108501E-03 4.901348431E-06 2.507449167E-04 -5.502944570E-05 A16= -1.925092148E-04 -2.443000596E-07 -5.884975283E-05 3.262584104E-06 A18= 1.930460213E-05 6.741121009E-09 8.603024274E-06 -8.417788210E-08 A20= -1.102815889E-06 -7.920856928E-11 -8.570290255E-07 -3.274001000E-09 A22= 2.739475663E-08 5.953489551 E-08 4.085854125E-10 A24= -2.850782301E-09 -1.826436678E-11 A26= 8.989498755E-11 4.514497985E-13 A28= -1.681525959E-12 -6.101009812E-15 A30= 1.413568451E-14 3.536536063E-17

[0227] In the 10th embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the 1st embodiment. The definitions of the parameters listed in the following table are also the same as in the 1st embodiment, with the corresponding values ​​for the 10th embodiment, so their explanations are not repeated.

[0228] Furthermore, these parameters from Table 10A and Table 10B can be calculated to the following values ​​and have the values ​​shown in Table 10C: Table 10C - 10. Design f [mm] 4,57 |f2 / f4| 0,76 Fno 2,80 |f6 / f8| 0,89 HFOV [°] 76,0 f / f78 -0,42 FOV [°] 151,9 f123 / f567 2,82 TL / lmgH 2,68 Dr1rs / f 1,97 10xBL / / lmgH 1,67 ΣCT / ΣAT 1,84 SL / TL 0,47 T12 / T67 1,03 CTmax / f 0,74 BL / CT3 0,31 ImgH / f 1,39 Dr3r6 / Dr9r12 2,30 TD / f 3,49 |R2 / R4| 0,59 1 OxBL / f 2,33 V6 19,5 |f1 / f7| 0,20 V8 23,5 <11. Design>

[0229] Fig. Figure 11A is a schematic view of an image recording apparatus 11 in the 11th embodiment of the present disclosure. Fig.Figure 11B shows the spherical aberration curves, astigmatic field curves, and the distortion curve of the image acquisition device 11 of the 11th embodiment. Fig.In 11A, the image-taking apparatus 11 comprises an imaging lens system (whose reference numeral has been omitted) and an image sensor IS. The imaging lens system comprises, in order from the object side to the image side along the optical path, a first lens element E1, a second lens element E2, an aperture S1, a third lens element E3, a fourth lens element E4, an aperture ST, a fifth lens element E5, an aperture S2, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image area IMG, wherein the image sensor IS is arranged in the image area IMG of the imaging lens system. The imaging lens system comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8), without one or more additional lens elements inserted between the first lens element E1 and the eighth lens element E8.

[0230] The first lens element E1 with negative refractive power has an object-side surface that is convex in its near-axis region and an image-side surface that is concave in its near-axis region. The first lens element E1 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the image-side surface of the first lens element E1 has two inflection points.

[0231] The second lens element E2, with negative refractive power, has an object-side surface that is convex near its axial region and an image-side surface that is concave near its axial region. The second lens element E2 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the second lens element E2 has an inflection point and a critical point, and the image-side surface of the second lens element E2 has an inflection point.

[0232] The third lens element E3, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The third lens element E3 is made of glass, and both its object-side and image-side surfaces are aspherical.

[0233] The fourth lens element E4, with positive refractive power, has an object-side surface that is concave in its near-axis region and an image-side surface that is convex in its near-axis region. The fourth lens element E4 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the fourth lens element E4 has an inflection point, and the image-side surface of the fourth lens element E4 also has an inflection point.

[0234] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The fifth lens element E5 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the fifth lens element E5 has an inflection point.

[0235] The sixth lens element E6, with negative refractive power, has an object-side surface that is concave in its near-axis region and an image-side surface that is convex in its near-axis region. The sixth lens element E6 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the image-side surface of the sixth lens element E6 exhibits an inflection point and a critical point.

[0236] The seventh lens element E7, with negative refractive power, has an object-side surface that is concave in its near-axis region, and an image-side surface that is also concave in its near-axis region. The seventh lens element E7 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the image-side surface of the seventh lens element E7 exhibits an inflection point and a critical point.

[0237] The eighth lens element E8, with negative refractive power, has an object-side surface that is convex in its near-axis region and an image-side surface that is concave in its near-axis region. The eighth lens element E8 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the eighth lens element exhibits an inflection point and a critical point, as does the image-side surface of the eighth lens element E8.

[0238] The filter E9 is made of glass and is arranged in sequence between the eighth lens element E8 and the image surface IMG and does not affect the focal length of the imaging lens system.

[0239] The optical data of the 11th embodiment are shown in Table 11A and the data of the aspherical surfaces are shown in Table 11B below. Table 11A - 11. Design f = 3.69 mm, Fno = 2.40, HFOV = 66.2° Surface No. radius of curvature thickness material index Abbesche number Focal length 0 object infinite infinite 1 Lens 1 46,2514 ASP 1,212 plastic 1,544 56,0 -7,07 2 3,5182 ASP 3,039 3 Lens 2 18,8183 ASP 1,032 plastic 1,669 19,5 -12,92 4 5,7934 ASP 0,930 5 Aperture even -0,678 6 Lens 3 5,0544 ASP 3,417 Glass 1,785 26,1 5,45 7 -19,5648 ASP 0,431 8 Lens 4 -4,9010 ASP 0,463 plastic 1,544 56,0 36,91 9 -4,0706 ASP 0,208 10 Opening aperture even 0,114 11 Lens 5 6,5164 ASP 1,301 plastic 1,544 56,0 4,09 12 -3,1392 ASP -0,184 13 Aperture even 0,320 14 Lens 6 -4,2549 ASP 0,763 plastic 1,669 19,5 -8,44 15 -18,4863 ASP 1,432 16 Lens 7 -83,5733 ASP 1,038 plastic 1,587 28,3 -45,31 17 39,2118 ASP 0,452 18 Lens 8 34,4531 ASP 1,276 plastic 1,614 25,6 -31,03 19 12,0918 ASP 0,457 20 filter even 0,210 Glass 1,517 64,2 - 21 even 0,434 22 Picture even - The reference wavelength is 587.6 nm (d-line). The effective radius of surface 5 (aperture S1) is 2.870 mm. The effective radius of surface 13 (aperture S2) is 1.510 mm. Table 11B - Aspheric coefficients Surface No. 1 2 3 4 k= 3.20227E+01 -3.06656E-01 2.32004E+01 -4.01075E+00 A4 = 6.517785463E-04 -2.437133585E-03 3.297064095E-03 8.853358557E-03 A6 = -4.987995618E-05 1.738824002E-03 3.304562630E-04 4.693656217E-04 A8 = 5.310939651E-06 -5.804727960E-04 -4.225380952E-04 -7.311632106E-04 A10= -2.927336080E-07 1.241802797E-04 1.226400458E-04 2.392003126E-04 A12= 8.791257939E-09 -1.618723546E-05 -2.156633320E-05 -4.720729507E-05 A14= -1.495225088E-10 1.280260587E-06 2.335421801 E-06 5.180889798E-06 A16= 1.358174726E-12 -5.629762431 E-08 -1.537114235E-07 -2.263785360E-07 A18= -5.129404615E-15 1.030279665E-09 5.741973365E-09 -3.890324273E-09 A20= -9.462586618E-11 4.251248510E-10 Surface No. 6 7 8 9 k = -3.23137E-01 -2.60641E+01 -1.30741E+01 -2.14722E+01 A4 = -1.750248831E-04 2.167978947E-03 8.277438460E-03 -4.420358319E-03 A6 = 1.510457027E-04 -4.850994304E-04 -4.401412025E-03 3.709271433E-03 A8 = -6.659374278E-05 -8.332671979E-05 1.506705967E-03 -3.723738579E-04 A10= 7.347678958E-06 -5.244431420E-08 -1.588752978E-04 1.677426257E-04 A12= -2.706969854E-07 3.516541180E-06 Surface No. 11 12 14 15 k = 1.68056E+00 4.07437E-01 1.42642E+00 4.12208E+01 A4 = 1.332058460E-02 -7.215084781E-03 -1.125589592E-02 4.779050428E-03 A6 = -1.517056762E-02 -5.337065816E-02 1.165395720E-02 3.075704816E-03 A8 = 1.194879273E-02 1.910726715E-01 3.546707334E-03 -4.371196597E-04 A10= -8.269897371 E-03 -3.501545459E-01 -8.309618741E-03 3.721201090E-04 A12= 3.235005510E-03 4.000591371E-01 4.281046505E-03 -4.169520484E-04 A14= -6.548065346E-04 -2.981649756E-01 -1.091891078E-03 1.725678718E-04 A16= 1.440680196E-01 1.182499883E-04 -3. 147705892E-05 A18= -4.341450885E-02 2.177638912E-06 A20= 7.400993976E-03 A22= -5.442976848E-04 Surface No. 16 17 18 19 k = -9.90000E+01 8.63058E+00 4.39004E+01 -6.94266E+00 A4 = -1.566817817E-02 3.329712078E-03 1.795382945E-02 6.810689366E-02 A6 = 2.293452590E-02 2.029109077E-03 -3.439242477E-02 -6.381752288E-02 A8 = -2.342958451 E-02 -1.042113554E-03 2.213313433E-02 3.024562399E-02 A10= 1.343435318E-02 1.283166543E-04 -8.442087913E-03 -9.309488221 E-03 A12= -4.974999760E-03 2.679647938E-06 2.170547383E-03 1.991998228E-03 A14= 1.216724358E-03 -2.049592937E-06 -4.028115132E-04 -3.056648816E-04 A16= -1.939818918E-04 1.986558820E-07 5.551178597E-05 3.412656235E-05 A18= 1.922388782E-05 -8.287158342E-09 -5.698733777E-06 -2.785564181E-06 A20= -1.067371573E-06 1.319002219E-10 4.310615972E-07 1.656488191E-07 A22= 2.524932803E-08 -2.353315820E-08 -7.081297263E-09 A24= 8.969844924E-10 2.116317690E-10 A26= -2.255879899E-11 -4.192668215E-12 A28= 3.354668803E-13 4.943133918E-14 A30= -2.229837129E-15 -2.623925360E-16

[0240] In the 11th embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the 1st embodiment. The definitions of the parameters listed in the following table are also the same as in the 1st embodiment, with the corresponding values ​​for the 11th embodiment, so their explanations are not repeated.

[0241] Furthermore, these parameters from Table 11A and Table 11B can be calculated to yield the following values ​​and have the values ​​shown in Table 11C: Table 11C - 11. Design f [mm] 3,69 |f2 / f4| 0,35 Fno 2,40 |f6 / f8| 0,27 HFOV [°] 66,2 f / f78 -0,21 FOV [°] 132,3 f123 / f567 2,91 TL / lmgH 2,88 Dr1rs / f 2,72 10xBL / / lmgH 1,80 ΣCT / ΣAT 1,73 SL / TL 0,43 T12 / T67 2,12 CTmax / f 0,93 BL / CT3 0,32 ImgH / f 1,66 Dr3r6 / Dr9r12 2,14 TD / f 4,49 |R2 / R4| 0,61 1 OxBL / f 2,98 V6 19,5 |f1 / f7| 0,16 V8 25,6 <12. Design>

[0242] Fig. Figure 12A is a schematic view of an image recording apparatus 12 in the 12th embodiment of the present disclosure. Fig.Figure 12B shows the spherical aberration curves, astigmatic field curves, and the distortion curve of the image acquisition device 12 of the 12th embodiment. Fig.In 12A, the image-taking apparatus 12 comprises an imaging lens system (whose reference numeral has been omitted) and an image sensor IS. The imaging lens system comprises, in order from the object side to the image side along the beam path, a first lens element E1, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture ST, a fifth lens element E5, an aperture S1, a sixth lens element E6, a seventh lens element E7, an eighth lens element E8, a filter E9, and an image area IMG, wherein the image sensor IS is arranged in the image area IMG of the imaging lens system. The imaging lens system comprises eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8), without one or more additional lens elements inserted between the first lens element E1 and the eighth lens element E8.

[0243] The first lens element E1 with negative refractive power has an object-side surface that is convex in its near-axis region and an image-side surface that is concave in its near-axis region. The first lens element E1 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the first lens element E1 has two inflection points, and the image-side surface of the first lens element E1 also has two inflection points.

[0244] The second lens element E2, with negative refractive power, has an object-side surface that is convex near its axial region and an image-side surface that is concave near its axial region. The second lens element E2 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the second lens element E2 has an inflection point and a critical point, and the image-side surface of the second lens element E2 has an inflection point.

[0245] The third lens element E3, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The third lens element E3 is made of glass, and both its object-side and image-side surfaces are aspherical.

[0246] The fourth lens element E4, with positive refractive power, has an object-side surface that is concave in its near-axis region and an image-side surface that is convex in its near-axis region. The fourth lens element E4 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the fourth lens element E4 has two inflection points, and the image-side surface of the fourth lens element E4 has one inflection point.

[0247] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in its near-axis region, and an image-side surface that is also convex in its near-axis region. The fifth lens element E5 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the fifth lens element E5 has an inflection point.

[0248] The sixth lens element E6, with negative refractive power, has an object-side surface that is concave in its near-axis region and an image-side surface that is convex in its near-axis region. The sixth lens element E6 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the image-side surface of the sixth lens element E6 exhibits an inflection point and a critical point.

[0249] The seventh lens element E7, with negative refractive power, has an object-side surface that is concave in its near-axis region, and an image-side surface that is also concave in its near-axis region. The seventh lens element E7 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the image-side surface of the seventh lens element E7 exhibits an inflection point and a critical point.

[0250] The eighth lens element E8, with positive refractive power, has an object-side surface that is convex near its axial region and an image-side surface that is concave near its axial region. The eighth lens element E8 is made of plastic, and both its object-side and image-side surfaces are aspherical. Furthermore, the object-side surface of the eighth lens element exhibits an inflection point and a critical point, as does the image-side surface of the eighth lens element E8.

[0251] The filter E9 is made of glass and is arranged in sequence between the eighth lens element E8 and the image surface IMG and does not affect the focal length of the imaging lens system.

[0252] The optical data of the 12th embodiment are shown in Table 12A and the data of the aspherical surfaces are shown in Table 12B below. Table 12A - 12. Design f = 3.61 mm, Fno = 2.80, HFOV = 67.7° Surface No. radius of curvature thickness material index Abbesche number Focal length 0 object infinite infinite 1 Lens 1 46,2763 ASP 1,258 plastic 1,535 55,9 -7,02 2 3,4370 ASP 2,963 3 Lens 2 18,8752 ASP 1,080 plastic 1,669 19,5 -13,30 4 5,9083 ASP 0,183 5 Lens 3 4,9521 ASP 3,443 Glass 1,785 25,8 5,57 6 -25,7629 ASP 0,456 7 Lens 4 -4,7695 ASP 0,491 plastic 1,544 56,0 33,23 8 -3,9108 ASP 0,263 9 Opening aperture even 0,019 10 Lens 5 6,0434 ASP 1,175 plastic 1,544 56,0 3,90 11 -3,0491 ASP -0,084 12 Aperture even 0,300 13 Lens 6 -4,1666 ASP 0,820 plastic 1,669 19,5 -7,75 14 -22,9238 ASP 1,361 15 Lens 7 -50,2835 ASP 0,942 plastic 1,587 28,3 -32,29 16 30,6493 ASP 0,342 17 Lens 8 26,6171 ASP 1,410 plastic 1,660 20,4 242,5 18 31,2547 ASP 0,457 19 filter even 0,210 Glass 1,517 64,2 - 20 even 0,430 21 Picture even - The reference wavelength is 587.6 nm (d-line). The effective radius of surface 12 (aperture S1) is 1.436 mm. Table 12B - Aspheric coefficients Surface No. 1 2 3 4 k = 2.96505E+01 -3.29105E-01 2.35530E+01 -4.10280E+00 A4 = 6.043566116E-04 -4.334552880E-03 2.136948854E-03 7.868413118E-03 A6 = -2.703938570E-05 2.705810198E-03 1.721602254E-03 1.898370144E-03 A8 = 2.614236468E-06 -8.653651808E-04 -9.861259609E-04 -1.528604536E-03 A10= -1.417748021E-07 1.857623045E-04 2.376286446E-04 4.469185318E-04 A12= 4.230510851E-09 -2.518059573E-05 -3.493861247E-05 -7.047835541E-05 A14= -7.324414747E-11 2.062269082E-06 3.229028960E-06 4.777310858E-06 A16= 6.882461023E-13 -9.228638134E-08 -1.843443329E-07 1.570193226E-07 A18= -2.697932555E-15 1.701375328E-09 6.044178807E-09 -4.123954381E-08 A20= -8.893790202E-11 1.648149166E-09 Surface No. 5 6 7 8 k = -2.25821E-01 -3.08367E+01 -1.22087E+01 -2.29274E+01 A4 = -2.273784410E-04 2.367342738E-03 8.241935476E-03 -5.146241114E-03 A6 = 1.205792087E-04 -5.008972253E-04 -5.362044163E-03 5.563262141E-03 A8 = -2.318285941E-05 -2.440242776E-04 2.241820099E-03 -7.221186457E-04 A10= -1.230585922E-06 6.612445815E-05 -3.344510447E-04 1.681143970E-04 A12= 2.376355391 E-07 -3.434690963E-06 OberflächeNr. 10 11 13 14 k = -9.43357E-02 8.33614E-01 1.62985E+00 3.88908E+01 A4 = 1.821508556E-02 -7.926833548E-03 -7.759692288E-03 3.886877992E-03 A6 = -2.429609071E-02 -3.831917187E-02 1.166597851E-02 2.005303524E-03 A8 = 2.323030919E-02 1.701500985E-01 2.284212731E-03 3.107572072E-03 A10= -2.203626402E-02 -3.937094467E-01 -1.071436814E-02 -3.100998434E-03 A12= 1.207291110E-02 5.654133800E-01 8.104429306E-03 1.422927954E-03 A14= -3.217429767E-03 -5.304023670E-01 -3.092663685E-03 -3.779003631E-04 A16= 3.239051123E-01 4.687087275E-04 5.419345514E-05 A18= -1.242700344E-01 -3.182159739E-06 A20= 2.720477384E-02 A22= -2.592832682E-03 OberflächeNr. 15 16 17 18 k = -9.88375E+01 -8.12275E+01 3.62678E+01 2.38578E+01 A4 = -1.066493138E-02 9.314747967E-03 2.692292998E-02 1.066728335E-01 A6 = 1.782100271E-02 -4.399737408E-03 -5.792487422E-02 -1.057638841E-01 A8 = -2.861969221E-02 1.691557814E-03 4.530380592E-02 5.436441896E-02 A10= 2.231514745E-02 -5.216786372E-04 -2.108988888E-02 -1.792747575E-02 A12= -1.060997119E-02 9.632015453E-05 6.544451873E-03 4.063465420E-03 A14= 3.211899142E-03 -1.040422523E-05 -1.428950098E-03 -6.556713205E-04 A16= -6.201890260E-04 6.504839648E-07 2.251093734E-04 7.669598980E-05 A18= 7.373775275E-05 -2.188139787E-08 -2.582767805E-05 -6.551501803E-06 A20= -4.912384019E-06 3.066525903E-10 2.155440653E-06 4.078915708E-07 A22= 1.403728583E-07 -1.292745680E-07 -1.827919610E-08 A24= 5.424051866E-09 5.736762692E-10 A26= -1.510781090E-10 -1.195800835E-11 A28= 2.509552769E-12 1.486345604E-13 A30= -1.881915820E-14 -8.334494032E-16

[0253] In the 12th embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the 1st embodiment. The definitions of the parameters listed in the following table are also the same as in the 1st embodiment, with the corresponding values ​​for the 12th embodiment, so their explanations are not repeated.

[0254] Furthermore, these parameters from Table 12A and Table 12B can be calculated to the following values ​​and have the values ​​shown in Table 12C: Tabelle 12C - 12. Ausführungsform f [mm] 3,61 |f2 / f4| 0,40 Fno 2,80 |f6 / f8| 0,03 HFOV [°] 67,7 f / f78 -0,10 FOV [°] 135,4 f123 / f567 4,18 TL / lmgH 2,86 Dr1rs / f 2,81 10xBL / / lmgH 1,79 ΣCT / ΣAT 1,83 SL / TL 0,42 T12 / T67 2,18 CTmax / f 0,95 BL / CT3 0,32 ImgH / f 1,70 Dr3r6 / Dr9r12 2,13 TD / f 4,55 |R2 / R4| 0,58 1 OxBL / f 3,04 V6 19,5 |f1 / f7| 0,22 V8 20,4 <13. Design>

[0255] Fig. Figure 14 is a schematic view of an image-taking apparatus 100 in the 13th embodiment of the present disclosure. Fig. In the 13th embodiment, the image acquisition device 100 is a camera module and comprises an imaging lens assembly 101, a drive assembly 102, and an image sensor 103, wherein the imaging lens assembly 101 includes the imaging lens system of the present disclosure and a lens tube (not shown in the drawings) for supporting the imaging lens system. The image acquisition device 100 can focus light from a recording object through the imaging lens assembly 101, focus the image through the drive assembly 102, and generate an image on the image sensor 103, and the image information can be transmitted.

[0256] The drive unit 102 can be an autofocus module that can be driven by drive systems such as voice coil motors (VCMs), microelectromechanical systems (MEMS), piezoelectric systems, or shape memory alloys, etc. The imaging lens system can be positioned by the drive unit 102 to achieve a favorable shooting position for capturing clear images when the object being photographed is positioned at different distances.

[0257] The image acquisition device 100 can have the image sensor 103 arranged in the image area of ​​the imaging lens system, for example a CMOS or CCD, with high light sensitivity and low noise. This is advantageous for producing realistic images with high-resolution image quality. Furthermore, the image acquisition device 100 can also include an image stabilization module 104, which can be a kinetic energy sensor, such as an accelerometer, a gyroscope, or a Hall-effect sensor. In the 13th embodiment, the image stabilization module 104 is a gyroscope, but is not limited to this. This allows the change in various axis directions of the imaging lens system to be adjusted in such a way as to compensate for image blur caused by movement at the time of exposure, and this is also advantageous for improving image quality when photographing moving subjects and in low light.Furthermore, advanced image correction functions, such as optical image stabilization (OIS) or electronic image stabilization (EIS), etc., can be provided. <14. Design>

[0258] Fig. Figure 15A is a schematic view of one side of an electronic device 200 in the 14th embodiment of the present disclosure. Fig. Figure 15B is a schematic view of another side of the electronic device 200. Fig. 15A. Fig. 15C is a block diagram of the electronic device 200 of the Fig. 15A. In the Fig. 15A, Fig. 15B and Fig. 15C, the electronic device 200 of the 14th embodiment is a smartphone comprising image capture devices 100, 110, 120, 130, 140, a flash module 201, a focusing aid module 202, an image signal processor (ISP) 203, a user interface 204 and a processor for image processing software 205, wherein each of the image capture devices 120, 130, 140 is a front camera. When the user takes pictures of a recording object 206 using the user interface 204, the electronic device 200 focuses using at least one of the image acquisition devices 100, 110, 120, 130, 140 and produces an image, compensating for low illumination if necessary using the flash module 201. Then the electronic device 200 quickly focuses on the recording object 206 according to the object distance information generated by the focusing aid module 202 and optimizes the image using the image signal processor 203 and the image processing software processor 205.This allows for further improvement of image quality. The focusing aid module 202 can operate with conventional infrared or laser to achieve fast focusing, and the user interface 204 can use a touch-sensitive screen or a physical switch for image acquisition and processing with various functions of the image processing software.

[0259] Each of the image-capturing devices 100, 110, 120, 130, 140 of the 14th embodiment can comprise the imaging lens system of the present disclosure and can be identical or similar to the image-capturing device 100 of the 13th embodiment and is not described again here. Specifically, in the 14th embodiment, the image-capturing devices 100, 110 can be a wide-angle image-capturing device or an ultra-wide-angle image-capturing device, or a wide-angle image-capturing device or a telephoto lens image-capturing device. The image-capturing devices 120, 130, 140 can be a wide-angle image-capturing device, an ultra-wide-angle image-capturing device, a time-of-flight (TOF) module, or other image-capturing devices, without limitation. Furthermore, the connections between each of the image-taking devices 110, 120, 130, 140 with other elements can be the same as those of the image-taking device 100 in Fig. 15C or adapted to the type of image-taking apparatus, which is not shown again and described in detail. <15. Design>

[0260] Fig. Figure 16 is a schematic view of one side of an electronic device 300 in the 15th embodiment of the present disclosure. In the 15th embodiment, the electronic device 300 is a smartphone comprising image capture devices 310, 320, 330 and a flash module 301.

[0261] The electronic device 300 of the 15th embodiment may comprise the same or similar elements as those of the 14th embodiment, and each of the image-capturing devices 310, 320, 330 of the 15th embodiment may have a configuration similar to or identical with that of the 14th embodiment and is not described again. Specifically, in the 15th embodiment, each of the image-capturing devices 310, 320, 330 may comprise the imaging lens system of the present disclosure and may be identical or similar with the image-capturing device 100 of the aforementioned 13th embodiment and is not described again.Specifically, the image-taking apparatus 310 can be an ultra-wide-angle image-taking apparatus, the image-taking apparatus 320 a wide-angle image-taking apparatus, the image-taking apparatus 330 a telephoto lens image-taking apparatus (which may have a beam path folding element) or be adapted according to the type of image-taking apparatus without being restricted to the arrangement. <16. Design>

[0262] Fig. Figure 17 is a schematic view of one side of an electronic device 400 in the 16th embodiment of the present disclosure. In the 16th embodiment, the electronic device 400 is a smartphone comprising image capture devices 410, 420, 430, 440, 450, 460, 470, 480, 490 and a flash module 401.

[0263] The electronic device 400 of the 16th embodiment may comprise the same or similar elements as those of the 14th embodiment, and each of the image-capturing devices 410, 420, 430, 440, 450, 460, 470, 480, 490 and the flash module 401 may have a configuration similar to or identical with that of the 14th embodiment and is not described again here. Specifically, in the 16th embodiment, each of the image-capturing devices 410, 420, 430, 440, 450, 460, 470, 480, 490 may comprise the imaging lens system of the present disclosure and may be identical or similar to the image-capturing device 100 of the aforementioned 13th embodiment and is not described again here.

[0264] Specifically, each of the image-taking devices 410, 420 can be an ultra-wide-angle image-taking device, each of the image-taking devices 430, 440 can be a wide-angle image-taking device, each of the image-taking devices 450, 460 can be a telephoto lens image-taking device, each of the image-taking devices 470, 480 can be a telephoto lens image-taking device (which may have a beam path folding element), the image-taking device 490 can be a TOF module or can be adapted according to the type of image-taking device without being restricted to the arrangement. <17. Design>

[0265] Fig. Figure 18A is a schematic view of one side of an electronic device 500 in the 17th embodiment of the present disclosure. Fig. Figure 18B is a schematic view of another side of the electronic device 500 in the 17th embodiment of the Fig. 18A. In the Fig. 18A and Fig. 18B of the 17th embodiment, the electronic device 500 is a smartphone comprising image recording devices 510, 520, 530, 540 and a user interface 504.

[0266] The electronic device 500 of the 17th embodiment may comprise the same or similar elements as those of the 14th embodiment, and each of the image-capturing devices 510, 520, 530, 540 and the user interface 504 may have a configuration similar to or identical with that of the 14th embodiment, which is not described again here. Specifically, in the 17th embodiment, the image-capturing device 510 corresponds to a non-circular opening located in an outer surface of the electronic device 500 for image capture, and the image-capturing devices 520, 530, 540 may be a telephoto lens image-capturing device, a wide-angle image-capturing device, or an ultra-wide-angle image-capturing device, respectively, or may be adapted according to the type of image-capturing device, without being restricted to the arrangement. <18. Design>

[0267] Fig. Figure 19 is a schematic view of one side of an electronic device 600 in the 18th embodiment of the present disclosure. Fig. In embodiment 18, the electronic device 600 is an unmanned aerial vehicle comprising an image acquisition device 610. The image acquisition device 610 may include the imaging lens system of the present disclosure and may be identical or similar to the image acquisition device 100 of embodiment 13 and is not described again here.

Claims

[1] Optical imaging lens system comprising eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8), wherein the eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8) are arranged in order from the object side to the image side along the ray path: a first lens element (E1), a second lens element (E2), a third lens element (E3), a fourth lens element (E4), a fifth lens element (E5), a sixth lens element (E6), a seventh lens element (E7) and an eighth lens element (E8), where each of the eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8) has an object-side surface facing the object side and an image-side surface facing the image side, where the first lens element (E1) has a negative refractive power, the second lens element (E2) has a negative refractive power and the image-side surface of the second lens element (E2) is concave in its near-axis region, the object-side surface of the fourth lens element (E4) is concave in its axial region, the object-side surface of the fifth lens element (E5) is convex in its axial region, the sixth lens element (E6) has a negative refractive power, the image-side surface of the eighth lens element (E8) has at least one inflection point (IS), where f is the focal length of the imaging lens system, f78 is the combined focal length of the seventh lens element (E7) and the eighth lens element (E8), R2 is the radius of curvature of the image-side surface of the first lens element (E1) and R4 is the radius of curvature of the image-side surface of the second lens element (E2), the following conditions are met: -1.20 <f / f78<0,10 und 0,10<|R2 / R4|<10,00. [2] Optical imaging lens system according to claim 1, in which the following condition is met with FOV for the maximum field of view of the imaging lens system: 120.0° <FOV<190,0°. [3] Optical imaging lens system according to claim 1, in which BL represents the axial distance between the image-side surface of the eighth lens element (E8) and the image area (IMG) and ImgH represents the maximum image height, the following condition is met: 0.50<10×BL / lmgH<3.

00. [4] Optical imaging lens system according to claim 1, further comprising: an aperture diaphragm (ST), where SL represents the axial distance between the aperture diaphragm (ST) and the image area (IMG) and TL for the axial distance between the object-side surface of the first lens element (E1) and the image surface (IMG) the following condition is met: 0.30 <SL / TL<0,55. [5] Optical imaging lens system according to claim 1, in which the following condition is satisfied with CT1 for the central thickness of the first lens element (E1), CT2 for the central thickness of the second lens element (E2), CT3 for the central thickness of the third lens element (E3), CT4 for the central thickness of the fourth lens element (E4), CT5 for the central thickness of the fifth lens element (E5), CT6 for the central thickness of the sixth lens element (E6), CT7 for the central thickness of the seventh lens element (E7), CT8 for the central thickness of the eighth lens element (E8), CTmax for the maximum among CT1, CT2, CT3, CT4, CT5, CT6, CT7, CT8 and f for the focal length of the imaging lens system: 0.40 <CTmax / f<1,20. [6] Optical imaging lens system according to claim 1, in which the following condition is satisfied with f123 for the combined focal length of the first lens element (E1), the second lens element (E2) and the third lens element (E3) and f567 for the combined focal length of the fifth lens element (E5), the sixth lens element (E6) and the seventh lens element (E7): 0.60 <f1 23 / f567<8,00. [7] Optical imaging lens system according to claim 1, in which the following condition is satisfied with f6 for the focal length of the sixth lens element (E6) and f8 for the focal length of the eighth lens element (E8): 0,00<|f6 / f8|<2,00. [8] Optical imaging lens system according to claim 1, in which the following condition is satisfied with V8 for the Abbe number of the eighth lens element (E8): 5.0 <V8<30,0. [9] Image recording apparatus (1), comprising: the imaging lens system according to claim 1, and an image sensor (IS) that is located in the image area (IMG) of the imaging lens system. [10] Electronic device (200), comprising: the image recording apparatus (100, 110, 120, 130, 140) according to claim 9. [11] Optical imaging lens system comprising eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8), wherein the eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8) are arranged in order from the object side to the image side along the ray path: a first lens element (E1), a second lens element (E2), a third lens element (E3), a fourth lens element (E4), a fifth lens element (E5), a sixth lens element (E6), a seventh lens element (E7) and an eighth lens element (E8), where each of the eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8) has an object-side surface facing the object side and an image-side surface facing the image side, where the first lens element (E1) has a negative refractive power, the second lens element (E2) has a negative refractive power the object-side surface of the fourth lens element (E4) is concave in its axial region, the sixth lens element (E6) has a negative refractive power, where f1 is the focal length of the first lens element (E1), f7 for the focal length of the seventh lens element (E7) and V8 for the Abbe number of the eighth lens element (E8) the following conditions are met: 0.00<|f1 / f7|<0.60 and 5.0 <V8<30,0. [12] Optical imaging lens system according to claim 11, in which the third lens element (E3) has a positive refractive power and the fifth lens element (E5) has a positive refractive power. [13] Optical imaging lens system according to claim 11, in which the following condition is met with TL for the axial distance between the object-side surface of the first lens element (E1) and the image surface (IMG) and ImgH for the maximum image height of the imaging lens system: 2.00 <TL / lmgH<4,00. [14] Optical imaging lens system according to claim 11, in which the following condition is satisfied with ImgH for the maximum image height of the imaging lens system and f for the focal length of the imaging lens system: 1.00 <lmgH / f<2,00. [15] Optical imaging lens system according to claim 11, in which the following condition is satisfied with TD being the axial distance between the object-side surface of the first lens element (E1) and the image-side surface of the eighth lens element (E8), and f being the focal length of the imaging lens system: 2.50 <TD / f<5,00. [16] Optical imaging lens system according to claim 11, in which BL represents the axial distance between the image-side surface of the eighth lens element (E8) and the image area (IMG) and CT3 represents the central thickness of the third lens element (E3) and the following condition is met: 0.15 <BL / CT3<0,70. [17] Optical imaging lens system according to claim 11, in which the following condition is satisfied with Dr3r6 for the axial distance between the object-side surface of the second lens element (E2) and the image-side surface of the third lens element (E3), and Dr9r12 for the axial distance between the object-side surface of the fifth lens element (E5) and the image-side surface of the sixth lens element (E6): 1.60 <Dr3r6 / Dr9r12<3,00. [18] Optical imaging lens system according to claim 11, in which the following condition is satisfied with T12 for the axial distance between the first lens element (E1) and the second lens element (E2) and T67 for the axial distance between the sixth lens element (E6) and the seventh lens element (E7): 0.50 <T12 / T67<4,00. [19] Optical imaging lens system according to claim 11, in which the central thickness of the third lens element (E3) is at its maximum among the central thicknesses of the eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8). [20] Optical imaging lens system comprising eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8), wherein the eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8) are arranged in order from the object side to the image side along the beam path: a first lens element (E1), a second lens element (E2), a third lens element (E3), a fourth lens element (E4), a fifth lens element (E5), a sixth lens element (E6), a seventh lens element (E7) and an eighth lens element (E8), where each of the eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8) has an object-side surface facing the object side and an image-side surface facing the image side, where the first lens element (E1) has a negative refractive power, the second lens element (E2) has a negative refractive power the object-side surface of the fourth lens element (E4) is concave in its axial region, the sixth lens element (E6) has a negative refractive power, the image-side surface of the eighth lens element (E8) has at least one inflection point (IP), where TD is the axial distance between the object-side surface of the first lens element (E1) and the image-side surface of the eighth lens element (E8), f is the focal length of the imaging lens system, and f78 is the combined focal length of the seventh lens element (E7) and the eighth lens element (E8), the following conditions are met: 2.00 <TD / f<5,00 und -0.80 <f / f78<0,00. [21] Optical imaging lens system according to claim 20, in which the image-side surface of the fourth lens element (E4) is convex in its near-axis region and the object-side surface of the fifth lens element (E5) is convex in its near-axis region. [22] Optical imaging lens system according to claim 20, in which the object-side surface of the second lens element (E2) has at least one inflection point (IP). [23] Optical imaging lens system according to claim 20, in which at least one of the third lens element (E3), the fourth lens element (E4) and the fifth lens element (E5) is made of glass. [24] Optical imaging lens system according to claim 20, in which BL is the axial distance between the image-side surface of the eighth lens element (E8) and the image surface (IMG), and f is the focal length of the imaging lens system, the following condition is met: 1.50<10xBL / f<4.

00. [25] Optical imaging lens system according to claim 20, in which the following condition is satisfied with f2 for the focal length of the second lens element (E2) and f4 for the focal length of the fourth lens element (E4): 0.00<|f2 / f4|<1.

60. [26] Optical imaging lens system according to claim 20, in which the following condition is satisfied with ΣCT for the sum of the central thicknesses of the lens elements of the imaging lens system and ΣAT for the sum of the axial distances between successive lens elements of the imaging lens system: 1.20<∑CT / ∑AT<2.

50. [27] Optical imaging lens system according to claim 20, further comprising: an aperture diaphragm (ST), where Dr1rs is the axial distance between the object-side surface of the first lens element (E1) and the aperture diaphragm (ST), and f is the focal length of the imaging lens system, the following condition is met: 1.50 <Dr1rs / f<3,50. [28] Optical imaging lens system according to claim 20, in which the following condition is satisfied with V6 for the Abbe number of the sixth lens element (E6): 5.0 <V6<26,0. [29] Optical imaging lens system according to claim 20, in which the following conditions are satisfied with f being the focal length of the imaging lens system, f78 being the combined focal length of the seventh lens element (E7) and the eighth lens element (E8), R2 being the radius of curvature of the image-side surface of the first lens element (E1) and R4 being the radius of curvature of the image-side surface of the second lens element (E2), f1 being the focal length of the first lens element (E1), f7 being the focal length of the seventh lens element (E7), V8 being the Abbe number of the eighth lens element (E8) and TD being the axial distance between the object-side surface of the first lens element (E1) and the image-side surface of the eighth lens element (E8): −0.43≤f / f78≤0.10, 0.53≤|R2 / R4|≤0.69, 0.01 ≤ |f1 / f7 | ≤ 0.22 18.2≤V8≤25.6 and 3.49≤TD / f≤4.55.

Images