Imaging optical lens assembly, image acquisition unit and electronic device

Abstract

Imaging optical lens assembly comprising eight lens elements (E1, E2, E3, E4, E5, E6, E7 and E8), wherein the eight lens elements (E1, E2, E3, E4, E5, E6, E7 and E8) are arranged in the order from an object side to an image side along an optical path as 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), and wherein each of the eight lens elements (E1, E2, E3, E4, E5, E6, E7 and E8) has an object-side surface facing the object side and an image-side surface facing the image side; wherein the fourth lens element (E4) has a positive refractive power, the fifth lens element (E5) has a positive refractive power, the object-side surface of the seventh lens element (E7) is concave in a paraxial region thereof, the object-side surface of the eighth lens element (E8) has at least one inflection point (P), and the imaging optical lens assembly further comprises an aperture diaphragm (ST) arranged between an imaged object and the fourth lens element (E4); and where TL is an axial distance between the object-side surface of the first lens element (E1) and an image surface (IMG), f is a focal length of the imaging optical lens assembly, T12 is an axial distance between the first lens element (E1) and the second lens element (E2), T34 is an axial distance between the third lens element (E3) and the fourth lens element (E4), CT6 is a central thickness of the sixth lens element (E6), and the following conditions are met: 3.00 < TL / f < 6.00 ; and 0.05 < (T12 + T34) / CT6 < 1.50.

Description

BACKGROUNDTechnical field

[0001] The present disclosure relates to an imaging optical lens assembly, an image capturing unit, and an electronic device, particularly to an imaging optical lens assembly and an image capturing unit applicable to an electronic device. Description of related technology

[0002] With the development of semiconductor manufacturing technology, the performance of image sensors has improved and their pixel size has been reduced. Therefore, high image quality is one of the essential features of an optical system today.

[0003] Furthermore, due to rapid technological change, the trend in electronic devices equipped with optical systems is moving toward multifunctionality for various applications, so the requirements for the functionality of optical systems have increased. However, for a conventional optical system, it is difficult to achieve a balance between requirements such as high image quality, low sensitivity, appropriate aperture size, miniaturization, and a desirable field of view. SUMMARY

[0004] According to one aspect of the present disclosure, an imaging optical lens assembly includes eight lens elements. The eight lens elements are, in order from an object side to an image side along an optical 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.

[0005] Preferably, the fourth lens element has a positive refractive power. Preferably, the fifth lens element has a positive refractive power. Preferably, the object-side surface of the seventh lens element is concave in a paraxial region thereof. Preferably, the object-side surface of the eighth lens element has at least one inflection point. Preferably, the imaging optical lens assembly further comprises an aperture stop arranged between an imaged object and the fourth lens element.

[0006] When an axial distance between the object-side surface of the first lens element and an image surface is TL, a focal length of the imaging optical lens assembly is f, an axial distance between the first lens element and the second lens element is T12, an axial distance between the third lens element and the fourth lens element is T34, and a central thickness of the sixth lens element is CT6, the following conditions are preferably satisfied: 3.00 <TL / f<6,00; and 0.05<(T12+T34) / CT6<1.50.

[0007] According to another aspect of the present disclosure, an imaging optical lens assembly includes eight lens elements. The eight lens elements are, in order from an object side to an image side along an optical 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.

[0008] Preferably, the fifth lens element has a positive refractive power. Preferably, the sixth lens element has a positive refractive power. Preferably, the image-side surface of the fourth lens element is convex in a paraxial region thereof.

[0009] Preferably, the object-side surface of the eighth lens element is convex in a paraxial region thereof. Preferably, the object-side surface of the eighth lens element has at least one inflection point. Preferably, the imaging optical lens assembly further comprises an aperture stop arranged between an imaged object and the fourth lens element.

[0010] When an axial distance between the object-side surface of the first lens element and an image surface is TL, a focal length of the imaging optical lens assembly is f, a focal length of the second lens element is f2, a focal length of the third lens element is f3, a focal length of the eighth lens element is f8, a radius of curvature of the object-side surface of the sixth lens element is R11, and a radius of curvature of the image-side surface of the sixth lens element is R12, the following conditions are preferably satisfied: 3.00 <TL / f<6,00; −1.50 <f / f2+f / f3+f / f8<0,38; and −3.00<(R11+R12) / (R11−R12)<3.00.

[0011] According to another aspect of the present disclosure, an imaging optical lens assembly includes eight lens elements. The eight lens elements are, in order from an object side to an image side along an optical 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.

[0012] Preferably, the fourth lens element has a positive refractive power. Preferably, the fifth lens element has a positive refractive power. Preferably, the sixth lens element has a positive refractive power. Preferably, the image-side surface of the fifth lens element is convex in a paraxial region thereof. Preferably, the object-side surface of the eighth lens element has at least one inflection point. Preferably, the imaging optical lens assembly further comprises an aperture stop arranged between an imaged object and the fourth lens element.

[0013] When an axial distance between the object-side surface of the first lens element and an image surface is TL, a focal length of the imaging optical lens assembly is f, an Abbe number of the third lens element is V3, an Abbe number of the seventh lens element is V7, and an Abbe number of the eighth lens element is V8, the following conditions are preferably satisfied: 3.00 <TL / f<6,00; and 18.0 <V3+V7+V8<105,0.

[0014] According to another aspect of the present disclosure, an image capturing unit comprises one of the aforementioned imaging optical lens assemblies and an image sensor, wherein the image sensor is arranged on the image surface of the imaging optical lens assembly.

[0015] According to another aspect of the present disclosure, an electronic device comprises the aforementioned image capture unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The disclosure can be better understood by reading the following detailed description of the embodiments, with reference to the accompanying drawings as follows: Fig. 1 is a schematic view of an image acquisition unit according to the first embodiment of the present disclosure; Fig. 2 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the first embodiment; Fig. 3 is a schematic view of an image acquisition unit according to the second embodiment of the present disclosure; Fig. 4 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the second embodiment; Fig.5 is a schematic view of an image acquisition unit according to the third embodiment of the present disclosure; Fig. 6 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image sensing unit according to the third embodiment; Fig. 7 is a schematic view of an image acquisition unit according to the 4th embodiment of the present disclosure; Fig. 8 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image sensing unit according to the 4th embodiment; Fig. 9 is a schematic view of an image acquisition unit according to the 5th embodiment of the present disclosure; Fig. 10 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image sensing unit according to the 5th embodiment; Fig.11 is a schematic view of an image acquisition unit according to the 6th embodiment of the present disclosure; Fig. 12 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image sensing unit according to the 6th embodiment; Fig. 13 is a schematic view of an image acquisition unit according to the 7th embodiment of the present disclosure; Fig. 14 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image sensing unit according to the 7th embodiment; Fig. 15 is a schematic view of an image acquisition unit according to the 8th embodiment of the present disclosure; Fig. 16 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image sensing unit according to the 8th embodiment; Fig.17 is a schematic view of an image acquisition unit according to the 9th embodiment of the present disclosure; Fig. 18 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image sensing unit according to the 9th embodiment; Fig. 19 is a schematic view of an image acquisition unit according to the 10th embodiment of the present disclosure; Fig. 20 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image sensing unit according to the 10th embodiment; Fig. 21 is a perspective view of an image acquisition unit according to the 11th embodiment of the present disclosure; Fig. 22 is a perspective view of an electronic device according to the 12th embodiment of the present disclosure; Fig.23 is another perspective view of the electronic device in Fig. 22; Fig. 24 is a block diagram of the electronic device in Fig. 22; Fig. 25 is a schematic view of an electronic device according to the 13th embodiment of the present disclosure; Fig. 26 is another schematic view of the electronic device in Fig. 25; Fig. 27 is a perspective view of an electronic device according to the 14th embodiment of the present disclosure; Fig. 28 is a perspective view of an electronic device according to the 15th embodiment of the present disclosure; Fig. 29 is a side view of the electronic device in Fig. 28; Fig. 30 is a plan view of the electronic device in Fig. 28; Fig.31 shows a schematic view of inflection points and critical points on lens surfaces according to the first embodiment of the present disclosure; Fig. 32 shows a schematic view of Y3R2, Y5R1, Y5R2, Y6R2, ET1, ET4, ET5, ET6, ET7, SAG1R2 and SAG7R1 according to the first embodiment of the present disclosure; Fig. 33 shows a schematic view of a configuration of a light folding element in an imaging optical lens assembly according to an embodiment of the present disclosure; Fig. 34 shows a schematic view of another configuration of a light folding element in an imaging optical lens assembly according to an embodiment of the present disclosure; and Fig.35 shows a schematic view of a configuration of two light folding elements in an imaging optical lens assembly according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0017] An imaging optical lens assembly includes eight lens elements. The eight lens elements are, in order from an object side to an image side along an optical 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 of the imaging optical lens assembly has an object-side surface facing the object side and an image-side surface facing the image side.

[0018] The first lens element may have a negative refractive power. Therefore, it is advantageous to cooperate with the positioning of the aperture stop to increase the size of the image surface. The image-side surface of the first lens element may be concave in a paraxial region thereof. Therefore, it is advantageous to adjust the propagation direction of the light to improve the light-gathering capacity of the imaging optical lens assembly.

[0019] The fourth lens element may have a positive refractive power. Therefore, it is advantageous for equalizing the refractive power distribution in the imaging optical lens assembly. The image-side surface of the fourth lens element may be convex in a paraxial region thereof. Therefore, it is advantageous for adjusting the direction of refraction of light on the fourth lens element and correcting spherical aberration.

[0020] The fifth lens element has positive refractive power. Therefore, it is advantageous to control the direction of the light path to collect light rays and achieve a balance between the field of view and the size distribution of the imaging optical lens assembly. The image-side surface of the fifth lens element may be convex in a paraxial region thereof. Therefore, it is advantageous to adjust the surface shape and refractive power of the fifth lens element to prevent stray light generated in the peripheral region due to an excessively large angle of incidence of the light.

[0021] The sixth lens element may have a positive refractive power. Therefore, it is advantageous for collecting light rays to reduce the size of the imaging optical lens assembly. The image-side surface of the sixth lens element may be convex in a paraxial region thereof. Therefore, it is advantageous for adjusting the light path direction to reduce the size and correct aberrations.

[0022] The object-side surface of the seventh lens element can be concave in a paraxial region. This makes it advantageous for correcting the field curvature to reduce distortion.

[0023] The object-side surface of the eighth lens element may be convex in a paraxial region thereof. Therefore, it is advantageous to reduce the field curvature and the back focal length to prevent an excessively long overall length of the imaging optical lens assembly.

[0024] The object-side surface of the eighth lens element has at least one inflection point. Therefore, it is advantageous to reduce the back focal length and increase the relative illuminance in the peripheral field of view and the light gathering quality of different wavelengths by varying the shape of the object-side surface of the eighth lens element. Fig. 31, which shows a schematic view of the inflection points P on the lens surfaces according to the first embodiment of the present disclosure. In Fig. 31, the image-side surface of the second lens element E2 and the object-side surface and the image-side surface of the eighth lens element E8 each have an inflection point P. The Fig. The first embodiment of the present disclosure shown in Figure 31 is merely exemplary. Each of the lens elements in various embodiments of the present disclosure may have one or more inflection points.

[0025] The object-side surface and the image-side surface of the seventh lens element can both be aspherical. Therefore, it is advantageous to improve the off-axis aberration correction capability of the seventh lens element to reduce chromatic aberration.

[0026] In the imaging optical lens assembly, at least one lens element may be made of glass material and at least one lens element may be made of plastic material. Therefore, it is advantageous for collaborating with spherical and aspherical surface designs, balancing manufacturability and manufacturing costs, and maintaining excellent stability under various environmental conditions.

[0027] The imaging optical lens assembly may include at least one cemented lens set, and the at least one cemented lens set is formed by cementing two adjacent lens elements from the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element, the seventh lens element, and the eighth lens element. Therefore, by reducing the difference in refractive index between the lens elements, it is advantageous to reduce the total internal reflection of peripheral light and thus prevent ghosting. Furthermore, two adjacent cemented surfaces of the two adjacent lens elements may both be aspherical. Therefore, it is advantageous to increase the flexibility of the optical design to correct astigmatism.The two adjacent cemented surfaces of the two adjacent lens elements refer to the image-side surface of the lens element closer to the object side and the object-side surface of the other lens element closer to the image side in the cemented lens set. Furthermore, the imaging optical lens assembly may also comprise at least two cemented lens sets.

[0028] According to the present disclosure, the imaging optical lens assembly further comprises an aperture stop disposed between an imaged object and the fourth lens element. Therefore, it is advantageous to adjust the position of the aperture stop to increase the relative illuminance in the peripheral field of view and enlarge the field of view. Furthermore, the aperture stop may be disposed between the first lens element and the third lens element. Furthermore, the aperture stop may be disposed between the second lens element and the third lens element.

[0029] When the axial distance between the object-side surface of the first lens element and the image surface is TL and the focal length of the imaging optical lens assembly is f, the following condition is satisfied: 3.00 < TL / f < 6.00. Therefore, it is advantageous to achieve a balance between the total track length and the field of view to meet market application requirements. Furthermore, the following condition can also be satisfied: 3.50 < TL / f < 6.00. Furthermore, the following condition can also be satisfied: 4.00 < TL / f < 5.80. Furthermore, the following condition can also be satisfied: 3.90 ≤ TL / f ≤ 5.50.

[0030] When an axial distance between the first lens element and the second lens element is T12, an axial distance between the third lens element and the fourth lens element is T34, and a central thickness of the sixth lens element is CT6, the following condition can be satisfied: 0.05 < (T12 + T34) / CT6 < 1.50. Therefore, it is advantageous to improve the spatial utilization of the imaging optical lens assembly while simultaneously increasing the manufacturing yield. In addition, the following condition can also be satisfied: 0.20 < (T12 + T34) / CT6 < 1.50. Furthermore, the following condition can also be satisfied: 0.43 ≤ (T12 + T34) / CT6 ≤ 0.99.

[0031] When the focal length of the imaging optical lens assembly is f, a focal length of the second lens element is f2, a focal length of the third lens element is f3, and a focal length of the eighth lens element is f8, the following condition can be satisfied: -1.50 < f / f2+f / f3+f / f8 < 0.38. Therefore, it is beneficial for a rational distribution of the refractive power of the imaging optical lens assembly to compensate for the convergence or divergence of light and thereby improve the light gathering quality across the entire field of view. In addition, the following condition can also be satisfied: -1.00 < f / f2+f / f3+f / f8 < 0.35. In addition, the following condition can also be satisfied: -0.50 < f / f2+f / f3+f / f8 < 0.30. In addition, the following condition can also be met: -0.16 ≤ f / f2+f / f3+f / f8 ≤ 0.14.

[0032] When the radius of curvature of the object-side surface of the sixth lens element is R11 and the radius of curvature of the image-side surface of the sixth lens element is R12, the following condition can be satisfied: -3.00 < (R11+R12) / (R11-R12) < 3.00. Therefore, it is advantageous to adjust the surface and refractive power of the sixth lens element to collect light rays and improve the quality of central light collection. Furthermore, the following condition can also be satisfied: -0.85 < (R11+R12) / (R11-R12) < 2.80. Furthermore, the following condition can also be satisfied: 0.32 ≤ (R11+R12) / (R11-R12) ≤ 1.51.

[0033] When the Abbe number of the third lens element is V3, the Abbe number of the seventh lens element is V7, and the Abbe number of the eighth lens element is V8, the following condition can be satisfied: 18.0 < V3+V7+V8 < 105.0. Therefore, it is beneficial to balance the material arrangement of the imaging optical lens assembly, thereby reducing chromatic aberrations in the central field of view and adjacent fields. In addition, the following condition can also be satisfied: 20.0 < V3+V7+V8 < 101.0. In addition, the following condition can also be satisfied: 27.0 < V3+V7+V8 < 86.0. In addition, the following condition can also be satisfied: 56.4 ≤ V3+V7+V8 ≤ 99.9.

[0034] When the radius of curvature of the image-side surface of the fourth lens element is R8 and the radius of curvature of the object-side surface of the fifth lens element is R9, the following condition can be satisfied: -10.00 < R8 / R9 < 0.15. Therefore, to increase the systematic balance of the imaging optical lens assembly, it is advantageous to design the shapes of the image-side surface of the fourth lens element and the object-side surface of the fifth lens element to control the direction of the light rays. In addition, the following condition can also be satisfied: -5.00 < R8 / R9 < 0.15.

[0035] When half of the maximum field of view of the imaging optical lens assembly is HFOV, the following condition can be satisfied: 0.82 < tan(HFOV) < 2.75. Therefore, it is advantageous for the imaging optical lens assembly to have a sufficient imaging area to meet the field of view requirements of application devices. In addition, the following condition can also be satisfied: 1.00 < tan(HFOV) < 2.15.

[0036] When the focal length of the imaging optical lens assembly is f, a focal length of the first lens element is f1, the focal length of the second lens element is f2, a focal length of the seventh lens element is f7, and the focal length of the eighth lens element is f8, the following condition can be satisfied: 0.00 ≤ (|f1|+|f7|) / (|f2|+|f8|) < 0.62. Therefore, it is advantageous to balance the refractive power arrangement of the imaging optical lens assembly to improve the ability for image quality correction.

[0037] When the radius of curvature of the image-side surface of the first lens element is R2 and the radius of curvature of the object-side surface of the second lens element is R3, the following condition can be satisfied: 0.00 ≤ |R2 / R3| < 0.60. Therefore, it is advantageous for light reception and light path adjustment by complementing the shapes of the image-side surface of the first lens element and the object-side surface of the second lens element. Furthermore, the following condition can also be satisfied: 0.00 ≤ |R2 / R3| < 0.45.

[0038] When the Abbe number of the fourth lens element is V4 and the refractive index of the fourth lens element is N4, the following condition can be satisfied: 6.50 < V4 / N4 < 35.70. Therefore, limiting the material selection for the fourth lens element is beneficial for correcting chromatic aberration, thereby improving image resolution. Furthermore, the following condition can also be satisfied: 17.00 < V4 / N4 < 35.70.

[0039] When a refractive index of the second lens element is N2, a refractive index of the third lens element is N3, and a refractive index of the sixth lens element is N6, the following condition can be satisfied: 1.25 < (N2 + N6) / N3 < 1.85. Therefore, it is advantageous to adjust the material distribution of the imaging optical lens assembly to balance the convergence ability between different wavelength bands of light.

[0040] When the f-number of the imaging optical lens assembly is Fno, the following condition can be satisfied: 1.30 < Fno < 1.85. Therefore, it is advantageous to adjust the aperture size to increase the light capture of the imaging optical lens assembly, enabling better image quality in low-light conditions. Furthermore, the following condition can also be satisfied: 1.40 < Fno < 1.80.

[0041] When a distance parallel to an optical axis between a position of the maximum effective radius of the object-side surface of the fourth lens element and a position of the maximum effective radius of the image-side surface of the fourth lens element is ET4, and a distance parallel to the optical axis between a position of the maximum effective radius of the object-side surface of the fifth lens element and a position of the maximum effective radius of the image-side surface of the fifth lens element is ET5, the following condition can be satisfied: 0.15 < ET4 / ET5 < 3.00. Therefore, it is favorable to direct the direction of the peripheral light paths to prevent total internal reflection. In addition, the following condition can also be satisfied: 0.18 < ET4 / ET5 < 2.60. Reference is made to Fig. 32, which shows a schematic view of ET4 and ET5 according to the first embodiment of the present disclosure.

[0042] When a maximum effective radius of the image-side surface of the fifth lens element is Y5R2 and the maximum effective radius of the image-side surface of the sixth lens element is Y6R2, the following condition can be satisfied: 0.75 < Y5R2 / Y6R2 < 1.30. Therefore, it is advantageous to limit the height of light refraction to prevent ineffective light collection due to excessive refraction angles in peripheral areas. Reference is made to Fig. 32, which shows a schematic view of Y5R2 and Y6R2 according to the first embodiment of the present disclosure.

[0043] When the axial distance between the object-side surface of the first lens element and the image-side surface of the eighth lens element is TD and the entrance pupil diameter of the imaging optical lens assembly is EPD, the following condition can be satisfied: 5.10 < TD / EPD < 8.00. Therefore, it is advantageous to increase the relative illuminance of the peripheral field of view and achieve a balance between illuminance, depth of field, and the size of the imaging optical lens assembly. In addition, the following condition can also be satisfied: 5.20 <TD / EPD<7,60.

[0044] When the focal length of the imaging optical lens assembly is f, the focal length of the first lens element is f1, and the focal length of the seventh lens element is f7, the following condition can be satisfied: -1.75 < f / f1 + f / f7 < -0.85. Therefore, it is preferable for the refractive power of the first lens element and the seventh lens element to cooperate to correct aberrations and field curvature and adjust the field of view. Furthermore, the following condition can also be satisfied: -1.75 < f / f1 + f / f7 < -0.95.

[0045] When the central thickness of the first lens element is CT1 and the central thickness of the seventh lens element is CT7, the following condition can be satisfied: 0.10 < CT7 / CT1 < 2.10. Therefore, it is advantageous to adjust the arrangement space of the lens elements to reduce manufacturing tolerances. Furthermore, the following condition can also be satisfied: 0.16 < CT7 / CT1 < 1.80.

[0046] When the axial distance between the third lens element and the fourth lens element is T34 and the central thickness of the sixth lens element is CT6, the following condition can be satisfied: 0.00 ≤ T34 / CT6 < 1.10. Therefore, reducing the total track length is advantageous for improving manufacturability. Furthermore, the following condition can also be satisfied: 0.00 ≤ T34 / CT6 < 0.60.

[0047] When the Abbe number of the first lens element is V1, the Abbe number of the third lens element is V3, and the Abbe number of the seventh lens element is V7, the following condition can be satisfied: 0.3 < (V3 + V7) / V1 < 1.0. Therefore, it is advantageous for the third lens element and the seventh lens element to have the ability to correct chromatic aberration to reduce color distortion in images.

[0048] When the radius of curvature of the object-side surface of the seventh lens element is R13 and the radius of curvature of the image-side surface of the seventh lens element is R14, the following condition can be satisfied: -1.70 < (R13 + R14) / (R13 - R14) < 0.70. Therefore, by adjusting the surface shape and the refractive power of the seventh lens element, systematic distortion can be limited to an acceptable range. In addition, the following condition can also be satisfied: -1.60 < (R13 + R14) / (R13 - R14) < 0.55.

[0049] When a displacement parallel to the optical axis from an axial vertex of the image-side surface of the first lens element to a position of the maximum effective radius of the image-side surface of the first lens element is SAG1R2 and a distance parallel to the optical axis between a position of the maximum effective radius of the object-side surface of the first lens element and the position of the maximum effective radius of the image-side surface of the first lens element is ET1, the following condition can be satisfied: 0.20 < SAG1R2 / ET1 < 0.85. Therefore, it is advantageous to restrict the edge shape of the first lens element so as to ensure the manufacturability of the imaging optical lens assembly. Reference is made to Fig.32, which shows a schematic view of SAG1R2 and ET1 according to the first embodiment of the present disclosure. When the direction from the axial vertex of a surface to the position of the maximum effective radius of the same surface points to the image side of the imaging optical lens assembly, the value of the shift is positive; when the direction from the axial vertex of the surface to the position of the maximum effective radius of the same surface points to the object side of the imaging optical lens assembly, the value of the shift is negative.

[0050] When a maximum effective radius of the image-side surface of the third lens element is Y3R2 and a maximum effective radius of the object-side surface of the fifth lens element is Y5R1, the following condition can be satisfied: 1.00 < Y5R1 / Y3R2 < 3.50. Therefore, it is advantageous to adjust peripheral light rays and correct off-axis aberrations to improve image quality. Reference is made to Fig. 32, which shows a schematic view of Y5R1 and Y3R2 according to the first embodiment of the present disclosure.

[0051] When a distance parallel to the optical axis between a position of the maximum effective radius of the object-side surface of the sixth lens element and a position of the maximum effective radius of the image-side surface of the sixth lens element is ET6, and a distance parallel to the optical axis between a position of the maximum effective radius of the object-side surface of the seventh lens element and a position of the maximum effective radius of the image-side surface of the seventh lens element is ET7, the following condition can be satisfied: 0.28 < ET6 / ET7 < 1.10. Therefore, by coordinating with the design of the peripheral surface to adjust the refractive power at the lens edges, it is advantageous to control peripheral light rays and correct astigmatism and distortion. Reference is made to Fig. 32, which shows a schematic view of ET6 and ET7 according to the first embodiment of the present disclosure.

[0052] When the Abbe number of the second lens element is V2, the following condition can be met: 5.0 < V2 < 53.0. Therefore, it is beneficial for preventing image ghosting and improving imaging performance. Furthermore, the following condition can also be met: 10.0 < V2 < 37.5.

[0053] When the focal length of the fourth lens element is f4 and the radius of curvature of the object-side surface of the fourth lens element is R7, the following condition can be satisfied: 0.00 ≤ |f4 / R7| < 1.20. Therefore, it is advantageous to control the refractive power and shape of the object-side surface of the fourth lens element to correct spherical aberration. Furthermore, the following condition can also be satisfied: 0.00 ≤ |f4 / R7| < 0.55.

[0054] When the central thickness of the fifth lens element is CT5 and the central thickness of the eighth lens element is CT8, the following condition can be satisfied: 0.18 < CT8 / CT5 < 1.85. Therefore, it is advantageous to adjust the arrangement space for the fifth lens element and the eighth lens element to balance the size distribution of the imaging optical lens assembly, thereby reducing assembly difficulty. Furthermore, the following condition can also be satisfied: 0.30 < CT8 / CT5 < 1.55.

[0055] When the axial distance between the aperture stop and the object-side surface of the third lens element is Dsr5 and the axial distance between the aperture stop and the object-side surface of the fifth lens element is Dsr9, the following condition can be satisfied: 0.00 < |Dsr5 / Dsr9| < 0.90. Therefore, it is beneficial for balancing the field of view area and the total track length of the imaging optical lens assembly for different applications.

[0056] When the radius of curvature of the image-side surface of the seventh lens element is R14 and the radius of curvature of the object-side surface of the eighth lens element is R15, the following condition can be satisfied: -0.08 < (R14-R15) / (R14+R15) < 6.00. Therefore, it is desirable for the radii of curvature of the image-side surface of the seventh lens element and the object-side surface of the eighth lens element to complement each other to correct the field curvature and thereby improve image quality. Furthermore, the following condition can also be satisfied: -0.05 < (R14-R15) / (R14+R15) < 2.50.

[0057] When a displacement parallel to the optical axis from an axial vertex of the object-side surface of the seventh lens element to the position of the maximum effective radius of the object-side surface of the seventh lens element is SAG7R1 and the central thickness of the seventh lens element is CT7, the following condition can be satisfied: -3.50 < SAG7R1 / CT7 < -0.50. Therefore, it is advantageous to restrict the curvature of the peripheral object-side surface of the seventh lens element in order to direct peripheral light rays onto the image surface and correct distortion. Reference is made to Fig.32, which shows a schematic view of SAG7R1 according to the first embodiment of the present disclosure. When the direction from the axial vertex of a surface to the position of the maximum effective radius of the same surface points toward the image side of the imaging optical lens assembly, the value of the shift is positive; when the direction from the axial vertex of the surface to the position of the maximum effective radius of the same surface points toward the object side of the imaging optical lens assembly, the value of the shift is negative.

[0058] According to the present disclosure, the above features and conditions can be used in numerous combinations to achieve corresponding effects.

[0059] According to the present disclosure, the lens elements of the imaging optical lens assembly can be made of either glass or plastic material. When the lens elements are made of glass material, the refractive power distribution of the imaging optical lens assembly can be more flexible, and the influence on imaging caused by temperature changes in the external environment can be reduced. The glass lens element can be manufactured by either grinding or molding. When the lens elements are made of plastic material, manufacturing costs can be effectively reduced. Furthermore, the surfaces of each lens element can be designed to be spherical or aspherical. Spherical lens elements are easy to manufacture.The design of aspherical lens elements allows for more control variables to eliminate aberrations and reduce the required number of lens elements, effectively shortening the overall track length of the imaging optical lens assembly. Furthermore, the aspherical surfaces can be manufactured using plastic injection molding or glass molding.

[0060] According to the present disclosure, when a lens surface is aspheric, it means that the lens surface has an aspherical shape over all or part of its optically effective area.

[0061] According to the present disclosure, one or more of the lens element materials may optionally include an additive that creates light absorption and interference effects and modifies the transmittance of the lens elements in a specific wavelength range to reduce unwanted stray light or color variations. For example, the additive may optionally filter out light in the wavelength range of 600 nm to 800 nm to reduce excessive red light and / or near-infrared light; or it may optionally filter out light in the wavelength range of 350 nm to 450 nm to prevent excessive blue light and / or near-ultraviolet light from interfering with the final image. The additive may be homogeneously blended with a plastic material used in the manufacture of a blended-material lens element by injection molding.In addition, the additive can be applied to the surfaces of the lens to achieve the above-mentioned effects.

[0062] According to the present disclosure, each of an object-side surface and an image-side surface has a paraxial region and an off-axis region. The paraxial region refers to the region of the surface where light rays travel near the optical axis, and the off-axis region refers to the region of the surface far from the paraxial region. Specifically, unless otherwise specified, a convex surface of the lens element means that the surface is convex in the paraxial region thereof; a concave surface of the lens element means that the surface is concave in the paraxial region thereof. In addition, when a range of refractive power or focus of a lens element is not defined, it means that the range of refractive power or focus of the lens element is located in the paraxial region thereof.

[0063] According to the present disclosure, an inflection point is a point on the surface of the lens element where the surface changes from concave to convex or vice versa. A critical point is an off-axis point of the lens surface where its tangent is perpendicular to the optical axis. Reference is made to Fig. 31, which shows a schematic view of the critical points C on the lens surfaces according to the first embodiment of the present disclosure. In Fig. 31, the image-side surface of the second lens element E2 and the object-side surface and the image-side surface of the eighth lens element E8 each have a critical point C in an off-axis region thereof. Fig.The first embodiment of the present disclosure shown in Figure 31 is merely exemplary. Each of the lens elements in various embodiments of the present disclosure may have one or more critical points in an off-axis region thereof.

[0064] According to the present disclosure, the image surface of the imaging optical lens assembly may be flat or curved based on the corresponding image sensor, in particular a curved surface that is concave and faces the object side of the imaging optical lens assembly.

[0065] According to the present disclosure, an image correction unit, such as a field flattener, can optionally be arranged between the lens element closest to the image side of the imaging optical lens assembly along the optical path and the image surface to correct aberrations such as field curvature. The optical properties of the image correction unit, such as curvature, thickness, refractive index, position, and surface shape (convex or concave surface with spherical, aspherical, diffractive, or Fresnel types), can be adjusted according to the design of the image acquisition unit. In general, a preferred image correction unit is, for example, a thin transparent element with a concave object-side surface and a flat image-side surface, with the thin transparent element arranged near the image surface.

[0066] According to the present disclosure, optionally at least one light folding element, such as a prism or a mirror, may be provided between an imaged object and the image surface on the optical path of the imaging, and the surface shape of the prism or mirror may be a flat, spherical, aspherical, or freeform surface, so that the imaging optical lens assembly can be more flexible in spatial arrangement and therefore the dimensions of an electronic device are not limited by the total track length of the imaging optical lens assembly. See in particular Fig. 33 and Fig. 34. Fig. 33 shows a schematic view of a configuration of a light folding element in an imaging optical lens assembly according to an embodiment of the present disclosure, and Fig.34 shows a schematic view of another configuration of a light folding element in an imaging optical lens assembly according to an embodiment of the present disclosure. In Fig. 33 and Fig. 34, the imaging optical lens assembly may include, in the order from an imaged object (not shown in the figures) to an image surface IMG along an optical path, a first optical axis OA1, a light folding element LF, and a second optical axis OA2. The light folding element LF may be arranged between the imaged object and a lens group LG of the imaging optical lens assembly, as shown in Fig. 33, or between a lens group LG and the image surface IMG of the imaging optical lens assembly, as shown in Fig. 34. In addition, Fig.35, which shows a schematic view of a configuration of two light folding elements in an imaging optical lens assembly according to an embodiment of the present disclosure. In Fig.35, the imaging optical lens assembly may include, in the order from an imaged object (not shown in the figure) to an image surface IMG along an optical path, a first optical axis OA1, a first light folding element LF1, a second optical axis OA2, a second light folding element LF2, and a third optical axis OA3. The first light folding element LF1 is arranged between the imaged object and a lens group LG of the imaging optical lens assembly, the second light folding element LF2 is arranged between the lens group LG and the image surface IMG of the imaging optical lens assembly, and the propagation direction of the light on the first optical axis OA1 may be the same direction as the propagation direction of the light on the third optical axis OA3, as shown in Fig.35. The imaging optical lens assembly may optionally be provided with three or more light folding elements, and the present disclosure is not limited to the type, number, and position of the light folding elements of the embodiments disclosed in the above-mentioned figures.

[0067] According to the present disclosure, the imaging optical lens assembly may include at least one diaphragm, such as an aperture diaphragm, a lens diaphragm, or a field diaphragm. The lens diaphragm or the field diaphragm is adjusted to eliminate stray light and thereby improve the image quality thereof.

[0068] According to the present disclosure, an aperture stop can be configured as a front stop or a center stop. A front stop disposed between an imaged object and the first lens element can create a larger distance between an exit pupil of the imaging optical lens assembly and the image surface to produce a telecentric effect, thereby improving the image sensor efficiency of an image sensor (e.g., CCD or CMOS). A center stop disposed between the first lens element and the image surface is beneficial for increasing the viewing angle of the imaging optical lens assembly, thereby providing a wider field of view for the same.

[0069] According to the present disclosure, the imaging optical lens assembly may include an aperture control unit. The aperture control unit may be a mechanical component or a light modulator that can control the size and shape of the aperture through electricity or electrical signals. The mechanical component may include a movable element, such as a blade array or a light-shielding film. The light modulator may include a shielding element, such as a filter, an electrochromic material, or a liquid crystal layer. The aperture control unit controls the amount of incident light or the exposure time to improve the ability to adjust image quality. Furthermore, the aperture control unit may be the aperture stop of the present disclosure, which changes the f-number to achieve different imaging effects, such as depth of field or the lens's maximum aperture.

[0070] According to the present disclosure, the imaging optical lens assembly may include one or more optical elements for defining the shape of light passing through the imaging optical lens assembly. Each optical element may be, but need not be, a filter, a polarizer, etc., and each optical element may be, but need not be, a single-piece element, a composite component, a thin film, etc. The optical element may be located on the object side or the image side of the imaging optical lens assembly, or between any two adjacent lens elements, to transmit light in a specific shape to meet application requirements.

[0071] According to the present disclosure, the imaging optical lens assembly may include at least one optical lens element, an optical element, or a substrate having at least one surface with an anti-reflective layer. The anti-reflective layer can effectively reduce stray light resulting from light reflection at the interface. The anti-reflective layer may be disposed in an optically ineffective region of an object-side surface or an image-side surface of the optical lens element, or a connecting surface between the object-side surface and the image-side surface. The optical element may be a light-blocking element, an annular spacer, a barrel element, a cover glass, a blue glass, a filter, a color filter, an optical path folding element (e.g., a reflective element), a prism, a mirror, etc.The carrier may be a base for supporting a lens array, a microlens arranged on an image sensor, a substrate surrounding the image sensor, a glass plate for protecting the image sensor, etc.

[0072] According to the present disclosure, the object side and the image side are defined according to the direction of the optical axis, and the axial optical data is calculated along the optical axis. When the optical axis is deflected by a light folding element, the axial optical data is also calculated along the deflected optical axis.

[0073] In accordance with the above description of the present disclosure, the following specific embodiments are provided for further explanation. 1. Embodiment

[0074] Fig. 1 is a schematic view of an image acquisition unit according to the first embodiment of the present disclosure. Fig.Figure 2 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the first embodiment. Fig.1, the image acquisition unit 1 includes the imaging optical lens assembly (its reference number is omitted) of the present disclosure and an image sensor IS. The imaging optical lens assembly includes, in order from an object side to an image side along an optical path, a first lens element E1, a second lens element E2, an aperture stop ST, a third lens element E3, a fourth lens element E4, a stop S1, 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 surface IMG. The imaging optical lens assembly includes eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element disposed between each of the adjacent eight lens elements.

[0075] The first lens element E1 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The first lens element E1 is made of glass material and has a spherical object-side surface and a spherical image-side surface.

[0076] The second lens element E2 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The second lens element E2 is made of plastic material and has an object-side surface and an image-side surface, both of which are aspherical. The image-side surface of the second lens element E2 has an inflection point. The image-side surface of the second lens element E2 has a critical point in an off-axis region thereof.

[0077] The third lens element E3 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The third lens element E3 is made of glass material and has an object-side surface and an image-side surface, both of which are spherical.

[0078] The fourth lens element E4 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The fourth lens element E4 is made of glass material and has a spherical object-side surface and a spherical image-side surface.

[0079] The fifth lens element E5 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The fifth lens element E5 is made of glass material and has a spherical object-side surface and a spherical image-side surface.

[0080] The sixth lens element E6 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The sixth lens element E6 is made of plastic material and has an aspherical object-side surface and an aspherical image-side surface.

[0081] The seventh lens element E7 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The seventh lens element E7 is made of plastic material and has an object-side surface and an image-side surface, both of which are aspherical. The object-side surface of the seventh lens element E7 and the image-side surface of the sixth lens element E6 are cemented together.

[0082] The eighth lens element E8 with negative refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The eighth lens element E8 is made of plastic material and has an aspherical object-side surface and an aspherical image-side surface. The object-side surface of the eighth lens element E8 has an inflection point. The image-side surface of the eighth lens element E8 has an inflection point. The object-side surface of the eighth lens element E8 has a critical point in an off-axis region thereof. The image-side surface of the eighth lens element E8 has a critical point in an off-axis region thereof.

[0083] The E9 filter is made of glass and is located between the eighth lens element E8 and the image surface IMG. It does not affect the focal length of the imaging optical lens assembly. The image sensor IS is located on or near the image surface IMG of the imaging optical lens assembly.

[0084] In the first embodiment, the imaging optical lens assembly comprises a cemented lens set (the reference numeral of which is omitted), the cemented lens set being formed by cementing the sixth lens element E6 and the seventh lens element E7 together, and two adjacent cemented surfaces of the sixth lens element E6 and the seventh lens element E7 are both aspherical, the two adjacent cemented surfaces of the sixth lens element E6 and the seventh lens element E7 being the image-side surface of the sixth lens element E6 and the object-side surface of the seventh lens element E7, respectively.

[0085] The equation of the aspherical surface profiles of the aforementioned lens elements of the first embodiment is expressed as follows: X(Y)=(Y2 / R) / (1+sqrt(1−(1+k)×(Y / R2))+∑i(Ai)×(Yi) , where X is the displacement parallel to an optical axis from an axial vertex on the aspherical surface to a point at a distance Y from the optical axis on the aspherical surface; Y is the vertical distance from the point on the aspherical surface to the optical axis; R is the radius of curvature; k is the cone coefficient; and Ai is the i-th aspherical coefficient, and in the embodiments, i may be 4, 6, 8, 10, 12, 14, and 16, but is not limited thereto.

[0086] In the imaging optical lens assembly of the image sensing unit 1 according to the first embodiment, when a focal length of the imaging optical lens assembly is f, an f-number of the imaging optical lens assembly is Fno, and half of a maximum of the imaging optical lens assembly is HFOV, these parameters have the following values: f = 6.41 millimeters (mm), Fno = 1.65, and HFOV = 50.0 degrees.

[0087] When the maximum field of view of the imaging optical lens assembly is FOV, the following condition is satisfied: FOV = 100.0 degrees.

[0088] When half of the maximum field of view of the imaging optical lens assembly is HFOV, the following condition is satisfied: tan(HFOV) = 1.19.

[0089] When an axial distance between the object-side surface of the first lens element E1 and the image-side surface of the eighth lens element E8 is TD and the entrance pupil diameter of the imaging optical lens assembly is EPD, the following condition is satisfied: TD / EPD = 6.85.

[0090] When an axial distance between the object-side surface of the first lens element E1 and the image surface IMG is TL and the focal length of the imaging optical lens assembly is f, the following condition is satisfied: TL / f = 4.65.

[0091] When a focal length of the first lens element E1 is f1, the focal length of the second lens element E2 is f2, a focal length of the seventh lens element E7 is f7, and a focal length of the eighth lens element E8 is f8, the following condition is satisfied: (|f1|+|f7|) / (|f2|+|f8|) = 0.07. In this embodiment, the focal length of a single lens element is calculated under the condition that a medium on both the object side and the image side of the single lens element is air.

[0092] When the focal length of the imaging optical lens assembly is f, the focal length of the second lens element E2 is f2, the focal length of the third lens element E3 is f3, and the focal length of the eighth lens element E8 is f8, the following condition is satisfied: f / f2+f / f3+f / f8 = -0.16.

[0093] If the focal length of the imaging optical lens assembly is f, the focal length of the first lens element E1 is f1, and the focal length of the seventh lens element E7 is f7, the following condition applies: f / f1+f / f7 = -1.26.

[0094] When a focal length of the fourth lens element E4 is f4 and the radius of curvature of the object-side surface of the fourth lens element E4 is R7, the following condition is satisfied: |f4 / R7| = 0.07.

[0095] When a radius of curvature of the image-side surface of the first lens element E1 is R2 and a radius of curvature of the object-side surface of the second lens element E2 is R3, the following condition is satisfied: |R2 / R3| = 0.22.

[0096] When a radius of curvature of the image-side surface of the fourth lens element E4 is R8 and a radius of curvature of the object-side surface of the fifth lens element E5 is R9, the following condition is satisfied: R8 / R9 = -0.10.

[0097] When a radius of curvature of the object-side surface of the sixth lens element E6 is R11 and a radius of curvature of the image-side surface of the sixth lens element E6 is R12, the following condition is satisfied: (R11+R12) / (R11-R12) = 0.52.

[0098] When a radius of curvature of the object-side surface of the seventh lens element E7 is R13 and a radius of curvature of the image-side surface of the seventh lens element E7 is R14, the following condition is satisfied: (R13+R14) / (R13-R14) = -1.09.

[0099] When the radius of curvature of the image-side surface of the seventh lens element E7 is R14 and a radius of curvature of the object-side surface of the eighth lens element E8 is R15, the following condition is satisfied: (R14-R15) / (R14+R15) = 1.15.

[0100] When a central thickness of the first lens element E1 is CT1 and a central thickness of the seventh lens element E7 is CT7, the following condition is satisfied: CT7 / CT1 = 0.95.

[0101] When an axial distance between the third lens element E3 and the fourth lens element E4 is T34 and a central thickness of the sixth lens element E6 is CT6, the following condition is satisfied: T34 / CT6 = 0.08. In this embodiment, an axial distance between two adjacent lens elements is a distance in a paraxial region between two adjacent lens surfaces of the two adjacent lens elements.

[0102] When a central thickness of the fifth lens element E5 is CT5 and a central thickness of the eighth lens element E8 is CT8, the following condition is satisfied: CT8 / CT5 = 0.59.

[0103] When an axial distance between the aperture stop ST and the object-side surface of the third lens element E3 is Dsr5 and an axial distance between the aperture stop ST and the object-side surface of the fifth lens element E5 is Dsr9, the following condition is satisfied: |Dsr5 / Dsr9| = 0.18.

[0104] When an axial distance between the first lens element E1 and the second lens element E2 is T12, the axial distance between the third lens element E3 and the fourth lens element E4 is T34, and the central thickness of the sixth lens element E6 is CT6, the following condition is satisfied: (T12+T34) / CT6 = 0.54.

[0105] If an Abbe number of the first lens element E1 is V1, the Abbe number of the third lens element E3 is V3, and the Abbe number of the seventh lens element E7 is V7, the following condition is satisfied: (V3+V7) / V1 = 0.6.

[0106] If the Abbe number of the third lens element E3 is V3, the Abbe number of the seventh lens element E7 is V7 and the Abbe number of the eighth lens element E8 is V8, the following condition is satisfied: V3+V7+V8 = 58.1.

[0107] If an Abbe number of the fourth lens element E4 is V4 and the refractive index of the fourth lens element E4 is N4, the following condition is satisfied: V4 / N4 = 26.57.

[0108] When a refractive index of the second lens element E2 is N2, a refractive index of the third lens element E3 is N3, and a refractive index of the sixth lens element E6 is N6, the following condition is satisfied: (N2+N6) / N3 = 1.78.

[0109] When a distance parallel to an optical axis between a position of the maximum effective radius of the object-side surface of the fourth lens element E4 and a position of the maximum effective radius of the image-side surface of the fourth lens element E4 is ET4, and a distance parallel to the optical axis between a position of the maximum effective radius of the object-side surface of the fifth lens element E5 and a position of the maximum effective radius of the image-side surface of the fifth lens element E5 is ET5, the following condition is satisfied: ET4 / ET5 = 0.29.

[0110] When a maximum effective radius of the image-side surface of the fifth lens element E5 is Y5R2 and a maximum effective radius of the image-side surface of the sixth lens element E6 is Y6R2, the following condition is satisfied: Y5R2 / Y6R2 = 1.08.

[0111] When a displacement parallel to the optical axis from an axial vertex of the image-side surface of the first lens element E1 to a position of the maximum effective radius of the image-side surface of the first lens element E1 is SAG1R2, and a distance parallel to the optical axis between a position of the maximum effective radius of the object-side surface of the first lens element E1 and the position of the maximum effective radius of the image-side surface of the first lens element E1 is ET1, the following condition is satisfied: SAG1R2 / ET1 = 0.57. In this embodiment, the direction of SAG1R2 points to the image side of the imaging optical lens assembly, and the value of SAG1R2 is positive.

[0112] When a maximum effective radius of the image-side surface of the third lens element E3 is Y3R2 and a maximum effective radius of the object-side surface of the fifth lens element E5 is Y5R1, the following condition is satisfied: Y5R1 / Y3R2 = 1.40.

[0113] When a distance parallel to the optical axis between a position of the maximum effective radius of the object-side surface of the sixth lens element E6 and a position of the maximum effective radius of the image-side surface of the sixth lens element E6 is ET6, and a distance parallel to the optical axis between a position of the maximum effective radius of the object-side surface of the seventh lens element E7 and a position of the maximum effective radius of the image-side surface of the seventh lens element E7 is ET7, the following condition is satisfied: ET6 / ET7 = 0.64.

[0114] When a displacement parallel to the optical axis from an axial vertex of the object-side surface of the seventh lens element E7 to the position of the maximum effective radius of the object-side surface of the seventh lens element E7 is SAG7R1 and the central thickness of the seventh lens element E7 is CT7, the following condition is satisfied: SAG7R1 / CT7 = -2.38. In this embodiment, the direction of SAG7R1 points toward the object side of the imaging optical lens assembly, and the value of SAG7R1 is negative.

[0115] If an Abbe number of the second lens element E2 is V2, the following condition is satisfied: V2 = 20.4.

[0116] The detailed optical data of the first embodiment are shown in Table 1A and the aspherical surface data in Table 1B below. TABLE 1 1. Embodiment f = 6.41 mm, Fno = 1.65, HFOV = 50.0 degrees Surface # radius of curvature thickness material index Abbé # focal length 0 object infinity infinity 1 Lens 1 -134,2375 (SPH) 0,950 Glass 1,500 66,1 -9,83 2 5,1205 (SPH) 2,146 3 Lens 2 -23,3097 (ASP) 1,427 plastic 1,660 20,4 -91,73 4 -38,8278 (ASP) 0,700 5 Aperture diaphragm Plano 1,258 6 Lens 3 -35,4410 (SPH) 1.315 Glass 1,805 25,5 -116,06 7 -58,0384 (SPH) 0,352 8 Lens 4 151,9651 (SPH) 2,031 Glass 1,788 47,5 11,34 9 -9,4340 (SPH) -1,240 10 aperture Plano 3,309 11 Lens 5 94,7071 (SPH) 3,870 Glass 1,678 55,5 18,97 12 -14,6382 (SPH) 0,537 13 Lens 6 22,4716 (ASP) 4,624 plastic 1,544 56,0 10,41 14 -7,0236 (ASP) 0,030 cemented 1,485 53,2 - 15 Lens 7 -7,0236 (ASP) 0,901 plastic 1,697 16,3 -10,54 16 -166,2464 (ASP) 2,146 17 Lens 8 11,5068 (ASP) 2,266 plastic 1,697 16,3 -214,37 18 9,8199 (ASP) 1,000 19 filter Plano 0,900 Glass 1,517 64,2 - 20 Plano 1,290 21 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). An effective radius of the aperture S1 (surface 10) is 4.716 mm. TABLE 1B Aspherical coefficients Surface # 3 4 13 14 k = 4,21166E+01 -9,00000E+01 1,23135E+01 4,23818E-01 A4 = 9,448E-05 -7,034E-05 -1,772E-04 2,381E-03 A6 = 2,928E-04 4,801E-04 1,012E-05 -2,669E-04 A8 = -9,395E-05 -1,652E-04 -8,469E-07 1,964E-05 A10 = 1,729E-05 3,060E-05 2,672E-08 -7,136E-07 A12 = -1,716E-06 -2,998E-06 -4,099E-10 1,313E-08 A14 = 8,544E-08 1,388E-07 - -9,194E-11 A16 = -1,551E-09 -2,130E-09 - - Surface # 15 16 17 18 k = 4,23818E-01 -9,00000E+01 -2,43097E+01 -1,91010E+01 A4 = 2,381E-03 -6,194E-04 -1,641E-03 -1,052E-03 A6 = -2,669E-04 5,907E-06 -3,674E-05 -3,874E-05 A8 = 1,964E-05 1,987E-07 1,198E-06 2,776E-06 A10 = -7,136E-07 2,791E-08 7,413E-08 -2,544E-08 A12 = 1,313E-08 -1,635E-09 -1,498E-09 -1,833E-09 A14 = -9,194E-11 1,972E-11 -5,520E-11 7,696E-11 A16 = - - 7,364E-13 -1,214E-12

[0117] Table 1A lists the radius of curvature, thickness, and focal length in millimeters (mm). Surface numbers 0-21 represent the surfaces arranged sequentially from the object side to the image side along the optical axis.

[0118] In Table 1B, k represents the cone coefficient of the aspherical surface profile equation. A4-A16 represent the aspherical coefficients in the range of 4th to 16th orders. The tables shown below for each embodiment are the corresponding schematic parameter and aberration curves, and the definitions of the tables are the same as in Table 1A and Table 1B of the first embodiment. Therefore, no further explanation is given in this regard. 2. Embodiment

[0119] Fig. 3 is a schematic view of an image acquisition unit according to the second embodiment of the present disclosure. Fig.Figure 4 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the second embodiment. Fig.3, the image capture unit 2 includes the imaging optical lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor IS. The imaging optical lens assembly includes, in order from an object side to an image side along an optical path, a first lens element E1, a second lens element E2, an aperture stop ST, a third lens element E3, a fourth lens element E4, a stop S1, 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 surface IMG. The imaging optical lens assembly includes eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element disposed between each of the adjacent eight lens elements.

[0120] The first lens element E1 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The first lens element E1 is made of glass material and has a spherical object-side surface and a spherical image-side surface.

[0121] The second lens element E2 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The second lens element E2 is made of plastic material and has an aspherical object-side surface and an aspherical image-side surface.

[0122] The third lens element E3 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The third lens element E3 is made of glass material and has a spherical object-side surface and a spherical image-side surface.

[0123] The fourth lens element E4 with positive refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The fourth lens element E4 is made of glass material and has a spherical object-side surface and a spherical image-side surface.

[0124] The fifth lens element E5 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The fifth lens element E5 is made of glass material and has a spherical object-side surface and a spherical image-side surface.

[0125] The sixth lens element E6 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The sixth lens element E6 is made of plastic material and has an aspherical object-side surface and an aspherical image-side surface.

[0126] The seventh lens element E7 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The seventh lens element E7 is made of plastic material and has an object-side surface and an image-side surface, both aspherical. The image-side surface of the seventh lens element E7 has an inflection point. The image-side surface of the seventh lens element E7 has a critical point in an off-axis region thereof. The object-side surface of the seventh lens element E7 and the image-side surface of the sixth lens element E6 are cemented together.

[0127] The eighth lens element E8 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The eighth lens element E8 is made of plastic material and has an aspherical object-side surface and an aspherical image-side surface. The object-side surface of the eighth lens element E8 has an inflection point. The image-side surface of the eighth lens element E8 has an inflection point. The object-side surface of the eighth lens element E8 has a critical point in an off-axis region thereof. The image-side surface of the eighth lens element E8 has a critical point in an off-axis region thereof.

[0128] The E9 filter is made of glass and is located between the eighth lens element E8 and the image surface IMG. It does not affect the focal length of the imaging optical lens assembly. The image sensor IS is located on or near the image surface IMG of the imaging optical lens assembly.

[0129] In the second embodiment, the imaging optical lens assembly comprises a cemented lens set (the reference numeral of which is omitted), the cemented lens set being formed by cementing the sixth lens element E6 and the seventh lens element E7 together, and two adjacent cemented surfaces of the sixth lens element E6 and the seventh lens element E7 are both aspherical, the two adjacent cemented surfaces of the sixth lens element E6 and the seventh lens element E7 being the image-side surface of the sixth lens element E6 and the object-side surface of the seventh lens element E7, respectively.

[0130] The detailed optical data of the second embodiment are shown in Table 2A and the aspherical surface data in Table 2B below. TABLE 2A 2. Embodiment f = 6.18 mm, Fno = 1.60, HFOV = 51.5 degrees Surface # radius of curvature thickness material index Abbé # focal length 0 object infinity infinity 1 Lens 1 -201,4075 (SPH) 0,950 Glass 1,497 81,6 -10,08 2 5,1473 (SPH) 2,283 3 Lens 2 -21,0249 (ASP) 1,218 plastic 1,661 20,3 -26,20 4 100,0000 (ASP) 1,079 5 Aperture diaphragm Plano 0,339 6 Lens 3 66,6667 (SPH) 0,950 Glass 1,847 23,8 34,96 7 -52,8744 (SPH) 1,457 8 Lens 4 -70,0919 (SPH) 2,157 Glass 1,729 54,7 14,73 9 -9,4340 (SPH) -1,219 10 aperture Plano 3,071 11 Lens 5 40,6830 (SPH) 2,464 Glass 1,640 60,2 17,37 12 -14,9379 (SPH) 1,318 13 Lens 6 22,3156 (ASP) 4,481 plastic 1,544 56,0 10,15 14 -6,8163 (ASP) 0,030 cemented 1,485 53,2 - 15 Lens 7 -6,8163 (ASP) 0,963 plastic 1,697 16,3 -9,37 16 164,0370 (ASP) 1,968 17 Lens 8 9,8559 (ASP) 2,269 plastic 1,697 16,3 101,49 18 10,3679 (ASP) 1,000 19 filter Plano 0,900 Glass 1,517 64,2 - 20 Plano 1,313 21 Picture Plano - Note: The reference wavelength is 587.6 nm (d-line). An effective radius of the aperture S1 (surface 10) is 4.680 mm. TABLE 2B Aspherical coefficients Surface # 3 4 13 14 k = 3,11574E+01 9,00000E+01 1,31944E+01 4,97908E-01 A4 = 6,131E-04 7,517E-04 -1,131E-04 2,405E-03 A6 = 2,689E-04 4,008E-04 9,270E-06 -2,527E-04 A8 = -9,516E-05 -1,520E-04 -7,595E-07 1,944E-05 A10 = 1,747E-05 2,904E-05 2,470E-08 -7,194E-07 A12 = -1,722E-06 -2,926E-06 -4,357E-10 1,323E-08 A14 = 8,489E-08 1,388E-07 - -8,386E-11 A16 = -1,551E-09 -2,130E-09 - - Surface # 15 16 17 18 k = 4,97908E-01 9,00000E+01 -1,14417E+01 -1,35967E+01 A4 = 2,405E-03 -6,731E-04 -1,840E-03 -1,374E-03 A6 = -2,527E-04 1,215E-05 -3,652E-05 -4,042E-05 A8 = 1,944E-05 3,295E-07 1,020E-06 3,053E-06 A10 = -7,194E-07 2,387E-08 6,996E-08 -2,855E-08 A12 = 1,323E-08 -1,833E-09 -1,391E-09 -2,237E-09 A14 = -8,386E-11 2,047E-11 -3,622E-11 8,053E-11 A16 = - - -3,075E-13 -1,058E-12

[0131] In the second embodiment, the equation for the aspherical surface profiles of the above-mentioned lens elements is the same as that of the first embodiment. The definitions of these parameters, listed in Table 2C below, are also the same as those given in the first embodiment, with corresponding values ​​for the second embodiment, so no further explanation is given in this regard.

[0132] In addition, these parameters can be calculated from Table 2A and Table 2B as the following values ​​and satisfy the following conditions: TABLE 2C Values ​​of optical and physical parameters / definitions f [mm] 6,18 CT7 / CT1 1,01 Fno 1,60 T34 / CT6 0,33 HFOV [degree] 51,5 CT8 / CT5 0,92 FOV [degrees] 103,0 |DSR5 / DSR9| 0,05 tan(HFOV) 1,26 (T12+T34) / CT6 0,83 TD / EPD 6,67 (V3+V7) / V1 0,5 TL / f 4,69 V3+V7+V8 56,4 (|f1|+|f7|) / (|f2|+|f8|) 0,15 V4 / N4 31,64 f / f2+f / f3+f / f8 0,0017 (N2+N6) / N3 1,74 f / f1 + f / f7 -1,27 ET4 / ET5 1,22 |f4 / R7| 0,21 Y5R2 / Y6R2 1,10 |R2 / R3| 0,24 SAG1 R2 / ET1 0,60 R8 / R9 -0,23 Y5R1 / Y3R2 1,64 (R11+R12) / (R11-R12) 0,53 ET6 / ET7 0,58 (R13+R14) / (R13-R14) -0,92 SAG7R1 / CT7 -2,06 (R14-R15) / (R14+R15) 0,89 V2 20,3 3. Embodiment

[0133] Fig. 5 is a schematic view of an image acquisition unit according to the 3rd embodiment of the present disclosure. Fig.Figure 6 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the third embodiment. Fig.5, the image sensing unit 3 includes the imaging optical lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor IS. The imaging optical lens assembly includes, in order from an object side to an image side along an optical path, a first lens element E1, a stop S1, a second lens element E2, an aperture stop ST, a third lens element E3, a fourth lens element E4, a stop S2, 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 surface IMG. The imaging optical lens assembly includes eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element disposed between each of the adjacent eight lens elements.

[0134] The first lens element E1 with negative refractive power has an object-side surface that is planar in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The first lens element E1 is made of glass material and has an object-side surface and an image-side surface, both of which are spherical.

[0135] The second lens element E2 with positive refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The second lens element E2 is made of plastic material and has an aspherical object-side surface and an aspherical image-side surface.

[0136] The third lens element E3 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The third lens element E3 is made of glass material and has an object-side surface and an image-side surface, both of which are spherical.

[0137] The fourth lens element E4 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The fourth lens element E4 is made of plastic material and has a spherical object-side surface and a spherical image-side surface. The object-side surface of the fourth lens element E4 and the image-side surface of the third lens element E3 are cemented together.

[0138] The fifth lens element E5 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The fifth lens element E5 is made of glass material and has a spherical object-side surface and a spherical image-side surface.

[0139] The sixth lens element E6 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The sixth lens element E6 is made of plastic material and has an object-side surface and an image-side surface, both of which are aspherical. The object-side surface of the sixth lens element E6 has an inflection point.

[0140] The seventh lens element E7 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The seventh lens element E7 is made of plastic material and has an aspherical object-side surface and an aspherical image-side surface. The image-side surface of the seventh lens element E7 has an inflection point. The image-side surface of the seventh lens element E7 has a critical point in an off-axis region thereof. The object-side surface of the seventh lens element E7 and the image-side surface of the sixth lens element E6 are cemented together.

[0141] The eighth lens element E8 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The eighth lens element E8 is made of plastic material and has an object-side surface and an image-side surface, both of which are aspherical. The object-side surface of the eighth lens element E8 has an inflection point. The image-side surface of the eighth lens element E8 has an inflection point. The object-side surface of the eighth lens element E8 has a critical point in an off-axis region thereof. The image-side surface of the eighth lens element E8 has a critical point in an off-axis region thereof.

[0142] The E9 filter is made of glass and is located between the eighth lens element E8 and the image surface IMG. It does not affect the focal length of the imaging optical lens assembly. The image sensor IS is located on or near the image surface IMG of the imaging optical lens assembly.

[0143] In the third embodiment, the imaging optical lens assembly comprises two cemented lens sets (the reference numerals of which are omitted), one of the two cemented lens sets being formed by cementing the third lens element E3 and the fourth lens element E4, and two adjacent cemented surfaces of the third lens element E3 and the fourth lens element E4 being the image-side surface of the third lens element E3 and the object-side surface of the fourth lens element E4, respectively. The other of the two cemented lens sets being formed by cementing the sixth lens element E6 and the seventh lens element E7, and two adjacent cemented surfaces of the sixth lens element E6 and the seventh lens element E7 being both aspherical, the two adjacent cemented surfaces of the sixth lens element E6 and the seventh lens element E7 being the image-side surface of the sixth lens element E6 and the object-side surface of the fourth lens element E4, respectively.the object-side surface of the seventh lens element E7.

[0144] The detailed optical data of the 3rd embodiment are shown in Table 3A and the aspherical surface data in Table 3B below. TABLE 3A 3. Embodiment f = 6.26 mm, Fno = 1.64, HFOV = 50.9 degrees Surface # radius of curvature thickness material index Abbé # focal length 0 object infinity infinity 1 Lens 1 infinity (SPH) 1,000 Glass 1,517 64,2 -8,58 2 4,4346 (SPH) 2,107 3 aperture Plano 0,375 4 Lens 2 -26,0568 (ASP) 2,427 plastic 1,656 21,3 28,93 5 -11,3869 (ASP) 0,360 6 Aperture diaphragm Plano 2,824 7 Lens 3 -29,6606 (SPH) 0,950 Glass 1,808 22,7 -26,58 8 79,0023 (SPH) 0,005 cemented 1,550 43,9 - 9 Lens 4 79,0023 (SPH) 2,307 plastic 1,755 52,3 14,10 10 -12,1474 (SPH) -0,974 11 aperture Plano 1,075 12 Lens 5 26,5027 (SPH) 2,857 Glass 1,729 54,7 15,24 13 -18,2676 (SPH) 0,100 14 Lens 6 23,2303 (ASP) 4,472 plastic 1,544 55,9 10,03 15 -6,6388 (ASP) 0,030 cemented 1,485 53,2 - 16 Lens 7 -6,6658 (ASP) 0,936 plastic 1,656 21,3 -8,10 17 27,7138 (ASP) 1,613 18 Lens 8 12,1405 (ASP) 3,650 plastic 1,656 21,3 39,19 19 20,2627 (ASP) 1,000 20 filter Plano 0,900 Glass 1,517 64,2 - 21 Plano 2,136 22 Picture Plano - Note: The reference wavelength is 587.6 nm (d-line). An effective radius of the aperture S1 (surface 3) is 3.232 mm. An effective radius of the aperture S2 (surface 11) is 4.950 mm. TABLE 3B Aspherical coefficients Surface # 4 5 14 15 k = 4,76443E+01 8,13520E+00 1,26773E+01 7,45165E-02 A4 = -5,309E-04 -1,874E-04 -3,104E-04 2,183E-03 A6 = 1,688E-05 2,571E-04 1,142E-05 -2,605E-04 A8 = -1,508E-05 -8,455E-05 -9,180E-07 2,012E-05 A10 = 4,634E-06 1,674E-05 2,762E-08 -7,665E-07 A12 = -7,117E-07 -1,829E-06 -3,848E-10 1,395E-08 A14 = 5,389E-08 1,055E-07 - -9,074E-11 A16 = -1,592E-09 -2,441E-09 - - Surface # 16 17 18 19 k = 7,45165E-02 -2,61448E+01 -4,51149E+00 -2,53449E+01 A4 = 2,157E-03 -1,335E-03 -2,290E-03 -8,969E-04 A6 = -2,553E-04 1,768E-05 2,334E-05 -5,741E-06 A8 = 1,956E-05 -3,229E-07 -2,499E-06 5,763E-07 A10 = -7,390E-07 3,323E-08 1,269E-07 1,130E-08 A12 = 1,334E-08 -1,526E-09 -1,053E-09 -1,661E-09 A14 = -8,607E-11 2,094E-11 -3,538E-11 7,285E-11 A16 = - - 1,971E-13 -1,195E-12

[0145] In the third embodiment, the equation of the aspherical surface profiles of the above-mentioned lens elements is the same as the equation of the first embodiment.

[0146] Also, the definitions of these parameters shown in the following Table 3C are the same as those given in the first embodiment with corresponding values ​​for the third embodiment, so an explanation thereof will not be given again.

[0147] In addition, these parameters can be calculated from Table 3A and Table 3B as the following values ​​and satisfy the following conditions: TABLE 3C Values ​​of optical and physical parameters / definitions f [mm] 6,26 CT7 / CT1 0,94 Fno 1,64 T34 / CT6 0,0011 HFOV [degree] 50,9 CT8 / CT5 1,28 FOV [degrees] 101,8 |DSR5 / DSR9| 0,46 tan(HFOV) 1,23 (T12+T34) / CT6 0,56 TD / EPD 6,84 (V3+V7) / V1 0,7 TL / f 4,81 V3+V7+V8 65,3 (|f1|+|f7|) / (|f2|+|f8|) 0,24 V4 / N4 29,80 f / f2+f / f3+f / f8 0,14 (N2+N6) / N3 1,77 f / f1 + f / f7 -1,50 ET4 / ET5 0,84 |f4 / R7| 0,18 Y5R2 / Y6R2 1,04 |R2 / R3| 0,17 SAG1 R2 / ET1 0,62 R8 / R9 -0,46 Y5R1 / Y3R2 1,22 (R11+R12) / (R11-R12) 0,56 ET6 / ET7 0,61 (R13+R14) / (R13-R14) -0,61 SAG7R1 / CT7 -2,35 (R14-R15) / (R14+R15) 0,39 V2 21,3 4. Embodiment

[0148] Fig. 7 is a schematic view of an image acquisition unit according to the 4th embodiment of the present disclosure. Fig. Figure 8 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the fourth embodiment. Fig.7, the image sensing unit 4 includes the imaging optical lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor IS. The imaging optical lens assembly includes, in order from an object side to an image side along an optical path, a first lens element E1, a stop S1, a second lens element E2, an aperture stop ST, a third lens element E3, a fourth lens element E4, a stop S2, 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 surface IMG. The imaging optical lens assembly includes eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element disposed between each of the adjacent eight lens elements.

[0149] The first lens element E1 with negative refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The first lens element E1 is made of plastic material and has a spherical object-side surface and a spherical image-side surface.

[0150] The second lens element E2 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The second lens element E2 is made of plastic and has an aspherical object-side surface and an aspherical image-side surface. The object-side surface of the second lens element E2 has an inflection point. The object-side surface of the second lens element E2 has a critical point in an off-axis region thereof.

[0151] The third lens element E3 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The third lens element E3 is made of glass material and has an object-side surface and an image-side surface, both of which are spherical.

[0152] The fourth lens element E4 with positive refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The fourth lens element E4 is made of glass material and has a spherical object-side surface and a spherical image-side surface. The object-side surface of the fourth lens element E4 and the image-side surface of the third lens element E3 are cemented together.

[0153] The fifth lens element E5 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The fifth lens element E5 is made of glass material and has a spherical object-side surface and a spherical image-side surface.

[0154] The sixth lens element E6 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The sixth lens element E6 is made of plastic material and has an aspherical object-side surface and an aspherical image-side surface. The object-side surface of the sixth lens element E6 has an inflection point. The image-side surface of the sixth lens element E6 has an inflection point. The object-side surface of the sixth lens element E6 has a critical point in an off-axis region thereof.

[0155] The seventh lens element E7 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The seventh lens element E7 is made of plastic material and has an object-side surface and an image-side surface, both of which are aspherical. The object-side surface of the seventh lens element E7 has an inflection point. The image-side surface of the seventh lens element E7 has an inflection point. The image-side surface of the seventh lens element E7 has a critical point in an off-axis region thereof. The object-side surface of the seventh lens element E7 and the image-side surface of the sixth lens element E6 are cemented together.

[0156] The eighth lens element E8 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The eighth lens element E8 is made of plastic material and has an aspherical object-side surface and an aspherical image-side surface. The object-side surface of the eighth lens element E8 has two inflection points. The image-side surface of the eighth lens element E8 has one inflection point. The object-side surface of the eighth lens element E8 has a critical point in an off-axis region thereof.

[0157] The E9 filter is made of glass and is located between the eighth lens element E8 and the image surface IMG. It does not affect the focal length of the imaging optical lens assembly. The image sensor IS is located on or near the image surface IMG of the imaging optical lens assembly.

[0158] In the fourth embodiment, the imaging optical lens assembly includes two cemented lens sets (the reference numerals of which are omitted), one of the two cemented lens sets being formed by cementing the third lens element E3 and the fourth lens element E4, and two adjacent cemented surfaces of the third lens element E3 and the fourth lens element E4 being the image-side surface of the third lens element E3 and the object-side surface of the fourth lens element E4, respectively. The other of the two cemented lens sets being formed by cementing the sixth lens element E6 and the seventh lens element E7, and two adjacent cemented surfaces of the sixth lens element E6 and the seventh lens element E7 being both aspherical, the two adjacent cemented surfaces of the sixth lens element E6 and the seventh lens element E7 being the image-side surface of the sixth lens element E6 and the object-side surface of the fourth lens element E4, respectively.the object-side surface of the seventh lens element E7.

[0159] The detailed optical data of the 4th embodiment are shown in Table 4A and the aspherical surface data in Table 4B below. TABLE 4A 4. Embodiment f = 5.79 mm, Fno = 1.52, HFOV = 54.3 degrees Surface # radius of curvature thickness material index Abbé # focal length 0 object infinity infinity 1 Lens 1 73,9795 (SPH) 3,100 plastic 1,697 56,2 -7,70 2 4,9150 (SPH) 1,818 3 aperture Plano 0,114 4 Lens 2 76,9231 (ASP) 2,996 plastic 1,697 16,3 43,62 5 -49,4969 (ASP) -0,081 6 Aperture diaphragm Plano 0,474 7 Lens 3 -9,8254 (SPH) 3,193 Glass 1,847 23,8 -14,11 8 -63,5194 (SPH) 0,005 cemented 1,550 43,9 - 9 Lens 4 -63,5194 (SPH) 1,529 Glass 1,804 46,6 18,08 10 -11,9584 (SPH) -0,784 11 aperture Plano 0,834 12 Lens 5 12,1808 (SPH) 3,524 Glass 1,804 46,6 10,11 13 -21,2946 (SPH) 1,028 14 Lens 6 24,2363 (ASP) 4,438 plastic 1,544 56,0 12,57 15 -8,9099 (ASP) 0,030 cemented 1,485 53,2 - 16 Lens 7 -8,9099 (ASP) 0,798 plastic 1,697 16,3 -10,69 17 47,3018 (ASP) 1,001 18 Lens 8 18,9164 (ASP) 1,738 plastic 1,639 23,5 23,26 19 -66,6667 (ASP) 1,000 20 filter Plano 0,900 Glass 1,517 64,2 - 21 Plano 4,158 22 Picture Plano - Note: The reference wavelength is 587.6 nm (d-line). An effective radius of the aperture S1 (surface 3) is 3.029 mm. An effective radius of the aperture S2 (surface 11) is 4.322 mm. TABLE 4B Aspherical coefficients Surface # 4 5 14 15 k = 9,50000E+01 -4,12203E+01 1,38198E+01 8,76278E-01 A4 = -1,209E-03 -1,274E-03 -4,975E-04 6,548E-04 A6 = 1,346E-04 3,623E-04 3,860E-06 -2,161E-04 A8 = -6,569E-05 -1,388E-04 -6,471E-07 1,724E-05 A10 = 1,396E-05 2,756E-05 2,264E-08 -7,494E-07 A12 = -1,566E-06 -2,858E-06 -4,221E-10 1,601E-08 A14 = 8,459E-08 1,382E-07 - -1,139E-10 A16 = -1,635E-09 -2,046E-09 - - Surface # 16 17 18 19 k = 8,76278E-01 -9,00000E+01 -4,56731E+01 4,86640E+01 A4 = 6,548E-04 -1,412E-03 -2,367E-03 -1,269E-03 A6 = -2,161E-04 1,948E-06 -6,037E-05 -4,200E-05 A8 = 1,724E-05 1,995E-07 2,496E-07 2,076E-06 A10 = -7,494E-07 2,038E-08 6,202E-08 -1,230E-08 A12 = 1,601E-08 -2,019E-09 4,543E-10 -7,995E-10 A14 = -1,139E-10 4,140E-11 -1,255E-11 4,271E-11 A16 = - - -3,683E-13 -6,367E-13

[0160] In Embodiment 4, the equation for the aspherical surface profiles of the above-mentioned lens elements is the same as that of Embodiment 1. The definitions of these parameters, listed in Table 4C below, are also the same as those in Embodiment 1, with corresponding values ​​for Embodiment 4, so no further explanation is given in this regard.

[0161] In addition, these parameters can be calculated from Table 4A and Table 4B as the following values ​​and satisfy the following conditions: TABLE 4C Values ​​of optical and physical parameters / definitions f [mm] 5,79 CT7 / CT1 0,26 Fno 1,52 T34 / CT6 0,0011 HFOV [degree] 54,3 CT8 / CT5 0,49 FOV [degrees] 108,6 |DSR5 / DSR9| 0,09 tan(HFOV) 1,39 (T12+T34) / CT6 0,44 TD / EPD 6,76 (V3+V7) / V1 0,7 TL / f 5,50 V3+V7+V8 63,6 (|f1|+|f7|) / (|f2|+|f8|) 0,27 V4 / N4 25,83 f / f2+f / f3+f / f8 -0,03 (N2+N6) / N3 1,75 f / f1+f / f7 -1,29 ET4 / ET5 0,67 |f4 / R7| 0,28 Y5R2 / Y6R2 1,12 |R2 / R3| 0,06 SAG1 R2 / ET1 0,30 R8 / R9 -0,98 Y5R1 / Y3R2 1,43 (R11+R12) / (R11-R12) 0,46 ET6 / ET7 0,87 (R13+R14) / (R13-R14) -0,68 SAG7R1 / CT7 -2,75 (R14-R15) / (R14+R15) 0,43 V2 16,3 5. Embodiment

[0162] Fig.9 is a schematic view of an image acquisition unit according to the 5th embodiment of the present disclosure. Fig. Figure 10 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the fifth embodiment. Fig.9, the image acquisition unit 5 includes the imaging optical lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor IS. The imaging optical lens assembly includes, in order from an object side to an image side along an optical path, a first lens element E1, a stop S1, a second lens element E2, an aperture stop ST, a third lens element E3, a fourth lens element E4, a stop S2, 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 surface IMG. The imaging optical lens assembly includes eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element disposed between each of the adjacent eight lens elements.

[0163] The first lens element E1 with negative refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The first lens element E1 is made of glass material and has a spherical object-side surface and a spherical image-side surface.

[0164] The second lens element E2 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The second lens element E2 is made of plastic material and has an aspherical object-side surface and an aspherical image-side surface. The object-side surface of the second lens element E2 has an inflection point. The object-side surface of the second lens element E2 has a critical point in an off-axis region thereof.

[0165] The third lens element E3 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The third lens element E3 is made of glass material and has an object-side surface and an image-side surface, both of which are spherical.

[0166] The fourth lens element E4 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The fourth lens element E4 is made of glass material and has a spherical object-side surface and a spherical image-side surface.

[0167] The fifth lens element E5 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The fifth lens element E5 is made of glass material and has a spherical object-side surface and a spherical image-side surface.

[0168] The sixth lens element E6 with positive refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The sixth lens element E6 is made of plastic material and has an aspherical object-side surface and an aspherical image-side surface.

[0169] The seventh lens element E7 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The seventh lens element E7 is made of plastic material and has an object-side surface and an image-side surface, both aspherical. The image-side surface of the seventh lens element E7 has an inflection point. The image-side surface of the seventh lens element E7 has a critical point in an off-axis region thereof. The object-side surface of the seventh lens element E7 and the image-side surface of the sixth lens element E6 are cemented together.

[0170] The eighth lens element E8 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The eighth lens element E8 is made of plastic material and has an aspherical surface on both the object side and the image side. The object-side surface of the eighth lens element E8 has an inflection point. The image-side surface of the eighth lens element E8 has an inflection point. The object-side surface of the eighth lens element E8 has a critical point in an off-axis region thereof.

[0171] The E9 filter is made of glass and is located between the eighth lens element E8 and the image surface IMG. It does not affect the focal length of the imaging optical lens assembly. The image sensor IS is located on or near the image surface IMG of the imaging optical lens assembly.

[0172] In the 5th embodiment, the imaging optical lens assembly comprises a cemented lens set (the reference numeral of which is omitted), wherein the cemented lens set is formed by cementing the sixth lens element E6 and the seventh lens element E7 together, and two adjacent cemented surfaces of the sixth lens element E6 and the seventh lens element E7 are both aspherical, wherein the two adjacent cemented surfaces of the sixth lens element E6 and the seventh lens element E7 are the image-side surface of the sixth lens element E6 and the object-side surface of the seventh lens element E7, respectively.

[0173] The detailed optical data of the 5th embodiment are shown in Table 5A and the aspherical surface data in Table 5B below. TABLE 5A 5. Embodiment f = 6.29 mm, Fno = 1.66, HFOV = 50.0 degrees Surface # radius of curvature thickness material index Abbé # focal length 0 object infinity infinity 1 Lens 1 212,7259 (SPH) 2,359 Glass 1,617 53,9 -7,77 2 4,6711 (SPH) 1,805 3 aperture Plano 0,022 4 Lens 2 41,9988 (ASP) 3,052 plastic 1,697 16,3 33,89 5 -52,3872 (ASP) -0,062 6 Aperture diaphragm Plano 0,406 7 Lens 3 -11,1050 (SPH) 3,090 Glass 1,805 25,5 -12,90 8 179,9611 (SPH) 0,100 9 Lens 4 37,9997 (SPH) 1,725 Glass 1,804 46,6 13,47 10 -14,8387 (SPH) -0,655 11 aperture Plano 0,705 12 Lens 5 12,5103 (SPH) 3,473 Glass 1,772 49,6 9,11 13 -14,1294 (SPH) 0,199 14 Lens 6 -90,9091 (ASP) 4,526 plastic 1,544 56,0 12,00 15 -6,1957 (ASP) 0,030 cemented 1,485 53,2 - 16 Lens 7 -6,1957 (ASP) 0,929 plastic 1,660 20,4 -9,19 17 306,5627 (ASP) 1,347 18 Lens 8 23,3886 (ASP) 1,560 plastic 1,639 23,5 33,10 19 -213,6451 (ASP) 1,000 20 filter Plano 0,900 Glass 1,517 64,2 - 21 Plano 4.481 22 Picture Plano - Note: The reference wavelength is 587.6 nm (d-line). An effective radius of the aperture S1 (surface 3) is 3.016 mm. An effective radius of the aperture S2 (surface 11) is 4.433 mm. TABLE 5B Aspherical coefficients Surface # 4 5 14 15 k = 5,14122E+01 -7,84455E+01 9,00000E+01 2,86119E-01 A4 = -1,006E-03 -1,215E-03 -5,162E-04 1,253E-03 A6 = 1,377E-04 3,812E-04 5,745E-06 -2,236E-04 A8 = -6,555E-05 -1,425E-04 -5,581E-07 1,808E-05 A10 = 1,396E-05 2,778E-05 2,210E-08 -7,287E-07 A12 = -1,565E-06 -2,857E-06 -3,980E-10 1,484E-08 A14 = 8,451E-08 1,382E-07 - -9,577E-11 A16 = -1,635E-09 -2,046E-09 - - Surface # 16 17 18 19 k = 2,86119E-01 8,37200E+01 -7,23153E+01 9,00000E+01 A4 = 1,253E-03 -1,370E-03 -2,590E-03 -1,604E-03 A6 = -2,236E-04 5,514E-06 -6,087E-05 -3,671E-05 A8 = 1,808E-05 1,827E-07 4,196E-07 2,294E-06 A10 = -7,287E-07 1,814E-08 7,741E-08 -1,379E-08 A12 = 1,484E-08 -1,774E-09 -1,298E-10 -1,176E-09 A14 = -9,577E-11 3,079E-11 -9,222E-12 6,257E-11 A16 = - - -7,111E-13 -9,909E-13

[0174] In the 5th embodiment, the equation for the aspherical surface profiles of the above-mentioned lens elements is the same as that of the 1st embodiment. The definitions of these parameters, listed in Table 5C below, are also the same as those in the 1st embodiment, with corresponding values ​​for the 5th embodiment, so no further explanation is given in this regard.

[0175] In addition, these parameters can be calculated from Table 5A and Table 5B as the following values ​​and satisfy the following conditions: TABLE C Values ​​of optical and physical parameters / definitions f [mm] 6,29 CT7 / CT1 0,39 Fno 1,66 T34 / CT6 0,02 HFOV [degree] 50,0 CT8 / CT5 0,45 FOV [degrees] 100,0 |DSR5 / DSR9| 0,08 tan(HFOV) 1,19 (T12+T34) / CT6 0,43 TD / EPD 6,50 (V3+V7) / V1 0,9 TL / f 4,93 V3+V7+V8 69,4 (|f1|+|f7|) / (|f2|+|f8|) 0,25 V4 / N4 25,83 f / f2+f / f3+f / f8 -0,11 (N2+N6) / N3 1,80 f / f1+f / f7 -1,49 ET4 / ET5 0,67 |f4 / R7| 0,35 Y5R2 / Y6R2 1,07 |R2 / R3| 0,11 SAG1 R2 / ET1 0,36 R8 / R9 -1,19 Y5R1 / Y3R2 1,34 (R11+R12) / (R11-R12) 1,15 ET6 / ET7 0,91 (R13+R14) / (R13-R14) -0,96 SAG7R1 / CT7 -2,77 (R14-R15) / (R14+R15) 0,86 V2 16,3 6. Embodiment

[0176] Fig. 11 is a schematic view of an image acquisition unit according to the 6th embodiment of the present disclosure. Fig. Figure 12 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the 6th embodiment. Fig.11, the image sensing unit 6 includes the imaging optical lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor IS. The imaging optical lens assembly includes, in order from an object side to an image side along an optical path, a first lens element E1, a stop S1, a second lens element E2, an aperture stop ST, a third lens element E3, a fourth lens element E4, a stop S2, 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 surface IMG. The imaging optical lens assembly includes eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element disposed between each of the adjacent eight lens elements.

[0177] The first lens element E1 with negative refractive power has an object-side surface that is planar in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The first lens element E1 is made of glass material and has an object-side surface and an image-side surface, both of which are spherical.

[0178] The second lens element E2 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The second lens element E2 is made of plastic material and has an object-side surface and an image-side surface, both of which are aspherical. The object-side surface of the second lens element E2 has an inflection point. The object-side surface of the second lens element E2 has a critical point in an off-axis region thereof.

[0179] The third lens element E3 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The third lens element E3 is made of glass material and has an object-side surface and an image-side surface, both of which are spherical.

[0180] The fourth lens element E4 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The fourth lens element E4 is made of glass material and has a spherical object-side surface and a spherical image-side surface. The object-side surface of the fourth lens element E4 and the image-side surface of the third lens element E3 are cemented together.

[0181] The fifth lens element E5 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The fifth lens element E5 is made of glass material and has a spherical object-side surface and a spherical image-side surface.

[0182] The sixth lens element E6 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The sixth lens element E6 is made of plastic material and has an aspherical object-side surface and an aspherical image-side surface. The object-side surface of the sixth lens element E6 has an inflection point. The object-side surface of the sixth lens element E6 has a critical point in an off-axis region thereof.

[0183] The seventh lens element E7 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The seventh lens element E7 is made of plastic material and has an object-side surface and an image-side surface, both of which are aspherical. The object-side surface of the seventh lens element E7 and the image-side surface of the sixth lens element E6 are cemented together.

[0184] The eighth lens element E8 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The eighth lens element E8 is made of plastic material and has an aspherical surface on both the object side and the image side. The surface of the eighth lens element E8 on the object side has an inflection point. The surface of the eighth lens element E8 on the image side has an inflection point. The surface of the eighth lens element E8 on the object side has a critical point in an off-axis region thereof. The image-side surface of the eighth lens element E8 has a critical point in an off-axis region thereof.

[0185] The E9 filter is made of glass and is located between the eighth lens element E8 and the image surface IMG. It does not affect the focal length of the imaging optical lens assembly. The image sensor IS is located on or near the image surface IMG of the imaging optical lens assembly.

[0186] In the 6th embodiment, the imaging optical lens assembly comprises two cemented lens sets (the reference numerals of which are omitted), wherein one of the two cemented lens sets is formed by cementing the third lens element E3 and the fourth lens element E4, and two adjacent cemented surfaces of the third lens element E3 and the fourth lens element E4 are the image-side surface of the third lens element E3 and the object-side surface of the fourth lens element E4, respectively.

[0187] The other of the two cemented lens sets is formed by cementing the sixth lens element E6 and the seventh lens element E7, and two adjacent cemented surfaces of the sixth lens element E6 and the seventh lens element E7 are both aspherical, the two adjacent cemented surfaces of the sixth lens element E6 and the seventh lens element E7 being the image-side surface of the sixth lens element E6 and the object-side surface of the seventh lens element E7, respectively.

[0188] The detailed optical data of the 6th embodiment are shown in Table 6A and the aspherical surface data in Table 6B below. TABLE 6A 6. Embodiment f = 6.25 mm, Fno = 1.64, HFOV = 50.9 degrees Surface # radius of curvature thickness material index Abbé # focal length 0 object infinity infinity 1 Lens 1 infinity (SPH) 1,190 Glass 1,517 64,2 -8,40 2 4,3430 (SPH) 2,017 3 aperture Plano 0,138 4 Lens 2 3182,6857 (ASP) 3,300 plastic 1,656 21,3 21,73 5 -14,3152 (ASP) 0,384 6 Aperture diaphragm Plano 0,773 7 Lens 3 -9,8163 (SPH) 1,628 Glass 1,805 25,5 -11,52 8 179,7489 (SPH) 0,005 cemented 1,550 43,9 - 9 Lens 4 179,7489 (SPH) 2,164 Glass 1,772 49,6 12,15 10 -9,8497 (SPH) -1,027 11 aperture Plano 1,077 12 Lens 5 20,8880 (SPH) 2,926 Glass 1,697 55,5 13,38 13 -15,8651 (SPH) 0,937 14 Lens 6 39,5440 (ASP) 4,800 plastic 1,544 55,9 9,32 15 -5,5645 (ASP) 0,030 cemented 1,485 53,2 - 16 Lens 7 -5,5645 (ASP) 0,940 plastic 1,656 21,3 -9,45 17 -57,8092 (ASP) 2,068 18 Lens 8 9,1800 (ASP) 1,800 plastic 1,656 21,3 46,63 19 12,0974 (ASP) 1,000 20 filter Plano 0,900 Glass 1,517 64,2 - 21 Plano 3,053 22 Picture Plano - Note: The reference wavelength is 587.6 nm (d-line). An effective radius of the aperture S1 (surface 3) is 3.090 mm. An effective radius of the aperture S2 (surface 11) is 4.430 mm. TABLE 6B Aspherical coefficients Surface # 4 5 14 15 k = -9,50000E+01 3,91552E-01 4,63302E+01 -5,90496E-01 A4 = -1,074E-03 -1,070E-03 -4,089E-04 2,664E-03 A6 = 2,328E-04 3,485E-04 5,087E-06 -3,393E-04 A8 = -8,653E-05 -1,117E-04 -7,997E-07 2,137E-05 A10 = 1,599E-05 1,824E-05 2,843E-08 -7,212E-07 A12 = -1,612E-06 -1,580E-06 -5,217E-10 1,211E-08 A14 = 8,008E-08 6,485E-08 - -8,299E-11 A16 = -1,462E-09 -8,511E-10 - - Surface # 16 17 18 19 k = -5,90496E-01 8,67436E+01 -1,58591E+01 -2,53838E+01 A4 = 2,664E-03 -1,090E-03 -7,932E-04 -3,769E-04 A6 = -3,393E-04 9,176E-06 -1,028E-04 -9,514E-05 A8 = 2,137E-05 -2,347E-07 2,065E-06 4,261E-06 A10 = -7,212E-07 3,962E-08 6,343E-08 -4,613E-08 A12 = 1,211E-08 -1,630E-09 -1,065E-09 -1,624E-09 A14 = -8,299E-11 2,070E-11 -3,222E-11 7,472E-11 A16 = - - 2,317E-13 -1,125E-12

[0189] In the sixth embodiment, the equation for the aspherical surface profiles of the above-mentioned lens elements is the same as that of the first embodiment. The definitions of these parameters, listed in Table 6C below, are also the same as those in the first embodiment, with corresponding values ​​for the sixth embodiment, so no further explanation is given in this regard.

[0190] In addition, these parameters can be calculated from Table 6A and Table 6B as the following values ​​and satisfy the following conditions: TABLE 6C Values ​​of optical and physical parameters / definitions f [mm] 6,25 CT7 / CT1 0,79 Fno 1,64 T34 / CT6 0,0010 HFOV [degree] 50,9 CT8 / CT5 0,62 FOV [degrees] 101,8 |DSR5 / DSR9| 0,17 tan(HFOV) 1,23 (T12+T34) / CT6 0,45 TD / EPD 6,60 (V3+V7) / V1 0,7 TL / f 4,82 V3+V7+V8 68,1 (|f1|+|f7|) / (|f2|+|f8|) 0,26 V4 / N4 27,99 f / f2+f / f3+f / f8 -0,12 (N2+N6) / N3 1,77 f / f1 + f / f7 -1,41 ET4 / ET5 0,83 |f4 / R7| 0,07 Y5R2 / Y6R2 0,99 |R2 / R3| 0,0014 SAG1 R2 / ET1 0,56 R8 / R9 -0,47 Y5R1 / Y3R2 1,32 (R11+R12) / (R11-R12) 0,75 ET6 / ET7 0,67 (R13+R14) / (R13-R14) -1,21 SAG7R1 / CT7 -3,19 (R14-R15) / (R14+R15) 1,38 V2 21,3 7. Embodiment

[0191] Fig. 13 is a schematic view of an image acquisition unit according to the 7th embodiment of the present disclosure. Fig. Figure 14 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the 7th embodiment. Fig.13, the image sensing unit 7 includes the imaging optical lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor IS. The imaging optical lens assembly includes, in order from an object side to an image side along an optical path, a first lens element E1, a stop S1, a second lens element E2, an aperture stop ST, a third lens element E3, a fourth lens element E4, a stop S2, 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 surface IMG. The imaging optical lens assembly includes eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), and no additional lens element is disposed between each of the adjacent eight lens elements.

[0192] The first lens element E1 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The first lens element E1 is made of glass material and has an object-side surface and an image-side surface, both of which are aspherical. The object-side surface of the first lens element E1 has an inflection point. The image-side surface of the first lens element E1 has an inflection point.

[0193] The second lens element E2 with positive refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The second lens element E2 is made of plastic material and has an object-side surface and an image-side surface, both of which are aspherical.

[0194] The third lens element E3 with negative refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The third lens element E3 is made of glass material and has an object-side surface and an image-side surface, both of which are aspherical. The object-side surface of the third lens element E3 has an inflection point. The image-side surface of the third lens element E3 has an inflection point.

[0195] The fourth lens element E4 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The fourth lens element E4 is made of glass material and has an object-side surface and an image-side surface, both of which are aspherical. The object-side surface of the fourth lens element E4 has one inflection point. The image-side surface of the fourth lens element E4 has two inflection points. The object-side surface of the fourth lens element E4 and the image-side surface of the third lens element E3 are cemented together.

[0196] The fifth lens element E5 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The fifth lens element E5 is made of glass material and has an object-side surface and an image-side surface, both of which are aspherical. The object-side surface of the fifth lens element E5 has an inflection point. The image-side surface of the fifth lens element E5 has an inflection point.

[0197] The sixth lens element E6 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The sixth lens element E6 is made of plastic and has an object-side surface and an image-side surface, both of which are aspherical. The object-side surface of the sixth lens element E6 has two inflection points.

[0198] The seventh lens element E7 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The seventh lens element E7 is made of plastic material and has an object-side surface and an image-side surface, both of which are aspherical. The object-side surface of the seventh lens element E7 has one inflection point. The image-side surface of the seventh lens element E7 has two inflection points.

[0199] The eighth lens element E8 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The eighth lens element E8 is made of plastic material and has an object-side surface and an image-side surface, both of which are aspherical. The object-side surface of the eighth lens element E8 has an inflection point. The image-side surface of the eighth lens element E8 has an inflection point. The object-side surface of the eighth lens element E8 has a critical point in an off-axis region thereof. The image-side surface of the eighth lens element E8 has a critical point in an off-axis region thereof.

[0200] The E9 filter is made of glass and is located between the eighth lens element E8 and the image surface IMG. It does not affect the focal length of the imaging optical lens assembly. The image sensor IS is located on or near the image surface IMG of the imaging optical lens assembly.

[0201] In the seventh embodiment, the imaging optical lens assembly comprises a cemented lens set (the reference numeral of which is omitted), the cemented lens set being formed by cementing the third lens element E3 and the fourth lens element E4 together, and two adjacent cemented surfaces of the third lens element E3 and the fourth lens element E4 are both aspherical, the two adjacent cemented surfaces of the third lens element E3 and the fourth lens element E4 being the image-side surface of the third lens element E3 and the object-side surface of the fourth lens element E4, respectively.

[0202] The detailed optical data of the seventh embodiment are shown in Table 7A and the aspherical surface data in Table 7B below. TABLE 7A 7. Embodiment f = 6.66 mm, Fno = 1.64, HFOV = 46.5 degrees Surface # radius of curvature thickness material index Abbé # focal length 0 object infinity infinity 1 Lens 1 -22,7143 (ASP) 0,700 Glass 1,497 81,6 -9,14 2 5,7332 (ASP) 1,548 3 aperture Plano 0,465 4 Lens 2 -21,7824 (ASP) 2,779 plastic 1,656 21,3 34,54 5 -11,6668 (ASP) -0,474 6 Aperture diaphragm Plano 2,304 7 Lens 3 50,0000 (ASP) 0,800 Glass 1,808 22,7 -13,11 8 8,6790 (ASP) 0,005 cemented 1,550 43,9 - 9 Lens 4 8,6790 (ASP) 2,296 Glass 1,804 46,6 8,85 10 -34,7310 (ASP) -0,281 11 aperture Plano 0,484 12 Lens 5 44,6400 (ASP) 2,146 Glass 1,804 46,6 12,83 13 -13,1276 (ASP) 0,050 14 Lens 6 24,1885 (ASP) 2,964 plastic 1,544 55,9 15,61 15 -12,5000 (ASP) 0,400 16 Lens 7 -13,5337 (ASP) 1,096 plastic 1,650 21,8 -10,06 17 13,0477 (ASP) 2,805 18 Lens 8 5,5962 (ASP) 1,732 plastic 1,562 44,6 24,10 19 8,4762 (ASP) 1,041 20 filter Plano 0,900 Glass 1,517 64,2 - 21 Plano 2,239 22 Picture Plano - Note: The reference wavelength is 587.6 nm (d-line). An effective radius of the aperture S1 (surface 3) is 3.059 mm. An effective radius of the aperture S2 (surface 11) is 4.872 mm. TABLE 7B Aspherical coefficients Surface # 1 2 4 5 7 8 k = -8,15181E+01 2,40560E-02 4,64378E+01 8,97333E+00 -9,50000E+01 7,69531E-01 A4 = 3,357E-04 1,186E-03 -7,166E-04 -4,405E-04 -6,267E-06 -6,219E-04 A6 = -5,373E-05 -1,105E-04 -3,113E-04 2,957E-04 -4,053E-06 3,186E-05 A8 = 5,310E-06 -1,754E-07 1,383E-04 -1,201E-04 3,233E-07 -4,903E-06 A10 = -2,553E-07 1,324E-06 -3,709E-05 2,978E-05 -2,963E-09 3,392E-07 A12 = 4,716E-09 -1,307E-07 5,795E-06 -4,087E-06 -4,413E-10 -8,211E-09 A14 = - - -4,919E-07 2,928E-07 - - A16 = - - 1,753E-08 -8,377E-09 - - Surface # 9 10 12 13 14 15 k = 7,69531E-01 -1,05533E+01 -5,17479E+00 -3,07744E-01 1,02894E+01 2,74393E+00 A4 = -6,219E-04 1,845E-04 3,195E-04 -8,956E-05 -5,866E-04 -3,777E-05 A6 = 3,186E-05 -4,975E-05 -6,333E-05 1,212E-05 5,395E-06 -4,725E-06 A8 = -4,903E-06 3,338E-06 3,916E-06 -9,042E-08 2,280E-06 -1,193E-06 A10 = 3,392E-07 -4,862E-08 -9,297E-08 -2,916E-08 -1,345E-07 1,963E-07 A12 = -8,211E-09 -5,974E-10 6,840E-10 7,807E-10 2,048E-09 -8,378E-09 A14 = - - - - - 1,150E-10 Surface # 16 17 18 19 - - k = 2,31934E+00 2,61518E+00 -4,75000E+00 -1,28663E+01 - - A4 = -1,569E-03 -3,661E-03 -8,291E-04 -2,057E-05 - - A6 = 4,072E-04 5,500E-04 -1,293E-04 -2,901E-04 - - A8 = -4,282E-05 -4,805E-05 4,333E-06 2,398E-05 - - A10 = 2,335E-06 2,341E-06 1,580E-07 -1,330E-06 - - A12 = -6,534E-08 -6,141E-08 -3,089E-08 4,412E-08 - - A14 = 7,438E-10 6,730E-10 1,182E-09 -8,034E-10 - - A16 = - - -1,517E-11 6,331E-12 - -

[0203] In the 7th embodiment, the equation for the aspherical surface profiles of the above-mentioned lens elements is the same as that of the 1st embodiment. The definitions of these parameters, listed in Table 7C below, are also the same as those in the 1st embodiment, with corresponding values ​​for the 7th embodiment, so no further explanation is given in this regard.

[0204] In addition, these parameters can be calculated from Table 7A and Table 7B as the following values ​​and satisfy the following conditions: TABLE 7C Values ​​of optical and physical parameters / definitions f [mm] 6,66 CT7 / CT1 1,57 Fno 1,64 T34 / CT6 0,0017 HFOV [degree] 46,5 CT8 / CT5 0,81 FOV [degrees] 93,0 |DSR5 / DSR9| 0,41 tan(HFOV) 1,05 (T12+T34) / CT6 0,68 TD / EPD 5,37 (V3+V7) / V1 0,5 TL / f 3,90 V3+V7+V8 89,1 (|f1|+|f7|) / (|f2|+|f8|) 0,33 V4 / N4 25,83 f / f2+f / f3+f / f8 -0,04 (N2+N6) / N3 1,77 f / f1+f / f7 -1,39 ET4 / ET5 1,06 |f4 / R7| 1,02 Y5R2 / Y6R2 0,99 |R2 / R3| 0,26 SAG1 R2 / ET1 0,53 R8 / R9 -0,78 Y5R1 / Y3R2 1,11 (R11+R12) / (R11-R12) 0,32 ET6 / ET7 0,41 (R13+R14) / (R13-R14) 0,02 SAG7R1 / CT7 -0,90 (R14-R15) / (R14+R15) 0,40 V2 21,3 8. Embodiment

[0205] Fig. 15 is a schematic view of an image acquisition unit according to the 8th embodiment of the present disclosure. Fig. Figure 16 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the 8th embodiment. Fig. 15, the image sensing unit 8 includes the imaging optical lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor IS. The imaging optical lens assembly includes, in order from an object side to an image side along an optical path, a first lens element E1, a stop S1, a second lens element E2, an aperture stop ST, a third lens element E3, a fourth lens element E4, a stop S2, 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 surface IMG. The imaging optical lens assembly includes eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element disposed between each of the adjacent eight lens elements.

[0206] The first lens element E1 with negative refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The first lens element E1 is made of glass material and has an object-side surface and an image-side surface, both of which are spherical.

[0207] The second lens element E2 with positive refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The second lens element E2 is made of plastic material and has an aspherical object-side surface and an aspherical image-side surface.

[0208] The third lens element E3 with negative refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The third lens element E3 is made of glass material and has an object-side surface and an image-side surface, both of which are spherical.

[0209] The fourth lens element E4 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The fourth lens element E4 is made of glass material and has a spherical object-side surface and a spherical image-side surface.

[0210] The fifth lens element E5 with positive refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The fifth lens element E5 is made of glass material and has a spherical object-side surface and a spherical image-side surface.

[0211] The sixth lens element E6 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The sixth lens element E6 is made of plastic and has an aspherical object-side surface and an aspherical image-side surface.

[0212] The seventh lens element E7 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The seventh lens element E7 is made of plastic material and has an object-side surface and an image-side surface, both of which are aspherical. The image-side surface of the seventh lens element E7 has three inflection points. The image-side surface of the seventh lens element E7 has a critical point in an off-axis region thereof. The object-side surface of the seventh lens element E7 and the image-side surface of the sixth lens element E6 are cemented together.

[0213] The eighth lens element E8 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The eighth lens element E8 is made of plastic material and has an aspherical object-side surface and an aspherical image-side surface. The object-side surface of the eighth lens element E8 has an inflection point. The image-side surface of the eighth lens element E8 has an inflection point. The object-side surface of the eighth lens element E8 has a critical point in an off-axis region thereof. The image-side surface of the eighth lens element E8 has a critical point in an off-axis region thereof.

[0214] The E9 filter is made of glass and is located between the eighth lens element E8 and the image surface IMG. It does not affect the focal length of the imaging optical lens assembly. The image sensor IS is located on or near the image surface IMG of the imaging optical lens assembly.

[0215] In the 8th embodiment, the imaging optical lens assembly comprises a cemented lens set (the reference numeral of which is omitted), the cemented lens set being formed by cementing the sixth lens element E6 and the seventh lens element E7 together, and two adjacent cemented surfaces of the sixth lens element E6 and the seventh lens element E7 are both aspherical, the two adjacent cemented surfaces of the sixth lens element E6 and the seventh lens element E7 being the image-side surface of the sixth lens element E6 and the object-side surface of the seventh lens element E7, respectively.

[0216] The detailed optical data of the 8th embodiment are shown in Table 8A and the aspherical surface data in Table 8B below. TABLE 8A 8. Embodiment f = 5.82 mm, Fno = 1.65, HFOV = 52.5 degrees Surface # radius of curvature thickness material index Abbé # focal length 0 object infinity infinity 1 Lens 1 20,0000 (SPH) 1,010 Glass 1,572 57,5 -9,68 2 4,2581 (SPH) 1,778 3 aperture Plano 0,324 4 Lens 2 -15,8644 (ASP) 1,555 plastic 1,697 16,3 213,75 5 -14,9154 (ASP) 0,378 6 Aperture diaphragm Plano -0,054 7 Lens 3 28,6692 (SPH) 0,950 Glass 1,805 25,5 -31,33 8 13,2215 (SPH) 1,729 9 Lens 4 354,6948 (SPH) 3,075 Glass 1,804 46,6 11,47 10 -9,4340 (SPH) -1,264 11 aperture Plano 2,778 12 Lens 5 -100,0000 (SPH) 2,353 Glass 1,772 49,6 16,26 13 -11,2766 (SPH) 0,796 14 Lens 6 19,6418 (ASP) 4,590 plastic 1,544 56,0 11,82 15 -8,7731 (ASP) 0,030 cemented 1,485 53,2 - 16 Lens 7 -8,7731 (ASP) 1,165 plastic 1,697 16,3 -8,75 17 21,0901 (ASP) 1,591 18 Lens 8 7,2392 (ASP) 3,152 plastic 1,566 37,4 25,85 19 12,0748 (ASP) 1,000 20 filter Plano 0,900 Glass 1,517 64,2 - 21 Plano 1,158 22 Picture Plano - Note: The reference wavelength is 587.6 nm (d-line). An effective radius of the aperture S1 (surface 3) is 2.701 mm. An effective radius of the aperture S2 (surface 11) is 4.759 mm. TABLE 8B Aspherical coefficients Surface # 4 5 14 15 k = 2,12542E+01 -6,48573E+00 9,12006E+00 1,31829E+00 A4 = -3,446E-04 -7,415E-04 -2,830E-04 1,232E-03 A6 = 2,400E-04 4,326E-04 1,247E-05 -2,465E-04 A8 = -7,982E-05 -1,655E-04 -8,557E-07 1,965E-05 A10 = 1,601E-05 3,216E-05 2,685E-08 -7,220E-07 A12 = -1,658E-06 -3,143E-06 -4,030E-10 1,285E-08 A14 = 8,538E-08 1,388E-07 - -7,955E-11 A16 = -1,551E-09 -2,130E-09 - - Surface # 16 17 18 19 k = 1,31829E+00 -2,54555E+01 -7,71619E+00 -1,71818E+01 A4 = 1,232E-03 -1,052E-03 -1,829E-04 4,989E-04 A6 = -2,465E-04 1,245E-05 -5,985E-05 -6,520E-05 A8 = 1,965E-05 3,991E-07 3,953E-07 2,200E-06 A10 = -7,220E-07 2,858E-08 7,640E-08 -2,246E-08 A12 = 1,285E-08 -1,720E-09 -6,065E-10 -1,274E-09 A14 = -7,955E-11 1,986E-11 -3,124E-11 1,021E-10 A16 = - - -2,030E-13 -2,349E-12

[0217] In the 8th embodiment, the equation for the aspherical surface profiles of the above-mentioned lens elements is the same as that of the 1st embodiment. The definitions of these parameters, listed in Table 8C below, are also the same as those in the 1st embodiment, with corresponding values ​​for the 8th embodiment, so no further explanation is given in this regard.

[0218] In addition, these parameters can be calculated from Table 8A and Table 8B as the following values ​​and satisfy the following conditions: TABLE 8C Values ​​of optical and physical parameters / definitions f [mm] 5,82 CT7 / CT1 1,15 Fno 1,65 T34 / CT6 0,38 HFOV [degree] 52,5 CT8 / CT5 1,34 FOV [degrees] 105,0 |DSR5 / DSR9| 0,01 tan(HFOV) 1,30 (T12+T34) / CT6 0,83 TD / EPD 7,35 (V3+V7) / V1 0,7 TL / f 4,98 V3+V7+V8 79,2 (|f1|+|f7|) / (|f2|+|f8|) 0,08 V4 / N4 25,83 f / f2+f / f3+f / f8 0,07 (N2+N6) / N3 1,80 f / f1 + f / f7 -1,27 ET4 / ET5 2,08 |f4 / R7| 0,03 Y5R2 / Y6R2 1,09 |R2 / R3| 0,27 SAG1 R2 / ET1 0,70 R8 / R9 0,09 Y5R1 / Y3R2 2,05 (R11+R12) / (R11-R12) 0,38 ET6 / ET7 0,48 (R13+R14) / (R13-R14) -0,41 SAG7R1 / CT7 -1,80 (R14-R15) / (R14+R15) 0,49 V2 16,3 9. Embodiment

[0219] Fig. 17 is a schematic view of an image acquisition unit according to the 9th embodiment of the present disclosure. Fig. Fig. 18 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the ninth embodiment. Fig. 17, the image sensing unit 9 includes the imaging optical lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor IS. The imaging optical lens assembly includes, in order from an object side to an image side along an optical path, a first lens element E1, a second lens element E2, an aperture stop ST, a third lens element E3, a fourth lens element E4, a stop S1, 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 surface IMG. The imaging optical lens assembly includes eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), and no additional lens element is disposed between each of the adjacent eight lens elements.

[0220] The first lens element E1 with negative refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The first lens element E1 is made of glass material and has an object-side surface and an image-side surface, both of which are spherical.

[0221] The second lens element E2 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The second lens element E2 is made of plastic material and has an object-side surface and an image-side surface, both of which are aspherical. The image-side surface of the second lens element E2 has two inflection points. The image-side surface of the second lens element E2 has a critical point in an off-axis region thereof.

[0222] The third lens element E3 with positive refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The third lens element E3 is made of glass material and has a spherical object-side surface and a spherical image-side surface.

[0223] The fourth lens element E4 with positive refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The fourth lens element E4 is made of glass material and has a spherical object-side surface and a spherical image-side surface.

[0224] The fifth lens element E5 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The fifth lens element E5 is made of glass material and has a spherical object-side surface and a spherical image-side surface.

[0225] The sixth lens element E6 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The sixth lens element E6 is made of plastic material and has an aspherical object-side surface and an aspherical image-side surface.

[0226] The seventh lens element E7 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The seventh lens element E7 is made of plastic material and has an aspherical object-side surface and an aspherical image-side surface. The object-side surface of the seventh lens element E7 and the image-side surface of the sixth lens element E6 are cemented together.

[0227] The eighth lens element E8 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The eighth lens element E8 is made of plastic material and has an aspherical object-side surface and an aspherical image-side surface. The object-side surface of the eighth lens element E8 has an inflection point. The image-side surface of the eighth lens element E8 has an inflection point. The object-side surface of the eighth lens element E8 has a critical point in an off-axis region thereof. The image-side surface of the eighth lens element E8 has a critical point in an off-axis region thereof.

[0228] The E9 filter is made of glass and is located between the eighth lens element E8 and the image surface IMG. It does not affect the focal length of the imaging optical lens assembly. The image sensor IS is located on or near the image surface IMG of the imaging optical lens assembly.

[0229] In the 9th embodiment, the imaging optical lens assembly comprises a cemented lens set (the reference numeral of which is omitted), the cemented lens set being formed by cementing the sixth lens element E6 and the seventh lens element E7 together, and two adjacent cemented surfaces of the sixth lens element E6 and the seventh lens element E7 are both aspherical, the two adjacent cemented surfaces of the sixth lens element E6 and the seventh lens element E7 being the image-side surface of the sixth lens element E6 and the object-side surface of the seventh lens element E7, respectively.

[0230] The detailed optical data of the 9th embodiment are shown in Table 9A and the aspherical surface data in Table 9B below. TABLE 9A 9. Embodiment f = 5.86 mm, Fno = 1.72, HFOV = 55.5 degrees Surface # radius of curvature thickness material index Abbé # focal length 0 object infinity infinity 1 Lens 1 626,6294 (SPH) 0,950 Glass 1,497 81,6 -9,99 2 4,9229 (SPH) 2,035 3 Lens 2 -17,5390 (ASP) 1,386 plastic 1,697 16,3 -42,28 4 -44,7157 (ASP) 0,616 5 Aperture diaphragm Plano 1,123 6 Lens 3 -21,2007 (SPH) 0,950 Glass 1,805 25,5 129,31 7 -17,9661 (SPH) 0,989 8 Lens 4 -596,2368 (SPH) 2,023 Glass 1,804 46,6 11,90 9 -9,4340 (SPH) -1,301 10 aperture Plano 3,016 11 Lens 5 51,5607 (SPH) 2,200 Glass 1,697 55,5 17,54 12 -15,7383 (SPH) 0,768 13 Lens 6 22,5987 (ASP) 4,349 plastic 1,544 56,0 9,71 14 -6,4307 (ASP) 0,030 cemented 1,485 53,2 - 15 Lens 7 -6,4307 (ASP) 1,233 plastic 1,697 16,3 -8,42 16 72,9371 (ASP) 2,288 17 Lens 8 7,0747 (ASP) 1,500 plastic 1,656 21,3 65,30 18 7,7623 (ASP) 1,000 19 filter Plano 0,900 Glass 1,517 64,2 - 20 Plano 0,937 21 Picture Plano - Note: The reference wavelength is 587.6 nm (d-line). An effective radius of the aperture S1 (surface 10) is 4.819 mm. TABLE 9B Aspherical coefficients Surface # 3 4 13 14 k = 2,46982E+01 -9,00000E+01 1,30766E+01 1,87260E-01 A4 = 7,373E-04 8,338E-04 -1,481E-06 2,508E-03 A6 = 2,556E-04 3,646E-04 1,278E-05 -2,495E-04 A8 = -8,671E-05 -1,444E-04 -8,522E-07 1,944E-05 A10 = 1,661E-05 2,944E-05 2,512E-08 -7,235E-07 A12 = -1,689E-06 -3,041E-06 -3,796E-10 1,322E-08 A14 = 8,538E-08 1,388E-07 - -8,994E-11 A16 = -1,551E-09 -2,130E-09 - - Surface # 15 16 17 18 k = 1,87260E-01 9,00000E+01 -5,30327E+00 -5,71414E+00 A4 = 2,508E-03 -5,768E-05 -1,502E-03 -1,542E-03 A6 = -2,495E-04 1,525E-05 -4,002E-05 -4,468E-05 A8 = 1,944E-05 3,581E-07 1,138E-06 3,120E-06 A10 = -7,235E-07 3,538E-08 8,153E-08 -1,729E-08 A12 = 1,322E-08 -1,411E-09 -9,791E-10 -1,958E-09 A14 = -8,994E-11 7,546E-12 -5,542E-11 6,936E-11 A16 = - - 4,498E-13 -1,230E-12

[0231] In the 9th embodiment, the equation for the aspherical surface profiles of the above-mentioned lens elements is the same as that of the 1st embodiment. The definitions of these parameters, listed in Table 9C below, are also the same as those in the 1st embodiment, with corresponding values ​​for the 9th embodiment, so explanations will not be repeated.

[0232] In addition, these parameters can be calculated from Table 9A and Table 9B as the following values ​​and satisfy the following conditions: TABLE 9C Values ​​of optical and physical parameters / definitions f [mm] 5,86 CT7 / CT1 1,30 Fno 1,72 T34 / CT6 0,23 HFOV [degree] 55,5 CT8 / CT5 0,68 FOV [degrees] 111,0 |DSR5 / DSR9| 0,17 tan(HFOV) 1,46 (T12+T34) / CT6 0,70 TD / EPD 7,09 (V3+V7) / V1 0,5 TL / f 4,61 V3+V7+V8 63,1 (|f1|+|f7|) / (|f2|+|f8|) 0,17 V4 / N4 25,83 f / f2+f / f3+f / f8 -0,0035 (N2+N6) / N3 1,80 f / f1+f / f7 -1,28 ET4 / ET5 0,94 |f4 / R7| 0,02 Y5R2 / Y6R2 1,12 |R2 / R3| 0,28 SAG1 R2 / ET1 0,57 R8 / R9 -0,18 Y5R1 / Y3R2 1,62 (R11+R12) / (R11-R12) 0,56 ET6 / ET7 0,46 (R13+R14) / (R13-R14) -0,84 SAG7R1 / CT7 -1,45 (R14-R15) / (R14+R15) 0,82 V2 16,3 10. Embodiment

[0233] Fig. 19 is a schematic view of an image acquisition unit according to the 10th embodiment of the present disclosure. Fig.Figure 20 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the 10th embodiment. Fig.19, the image sensing unit 10 includes the imaging optical lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor IS. The imaging optical lens assembly includes, in order from an object side to an image side along an optical path, a first lens element E1, a stop S1, a second lens element E2, an aperture stop ST, a third lens element E3, a fourth lens element E4, a stop S2, 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 surface IMG. The imaging optical lens assembly includes eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), with no additional lens element disposed between each of the adjacent eight lens elements.

[0234] The first lens element E1 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The first lens element E1 is made of glass material and has an object-side surface and an image-side surface, both of which are aspherical. The object-side surface of the first lens element E1 has an inflection point.

[0235] The second lens element E2 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The second lens element E2 is made of plastic material and has an aspherical object-side surface and an aspherical image-side surface. The object-side surface of the second lens element E2 has an inflection point. The object-side surface of the second lens element E2 has a critical point in an off-axis region thereof.

[0236] The third lens element E3 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The third lens element E3 is made of glass material and has an object-side surface and an image-side surface, both of which are aspherical. The image-side surface of the third lens element E3 has an inflection point.

[0237] The fourth lens element E4 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The fourth lens element E4 is made of glass material and has an object-side surface and an image-side surface, both of which are aspherical. The image-side surface of the fourth lens element E4 has an inflection point.

[0238] The fifth lens element E5 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The fifth lens element E5 is made of glass material and has an object-side surface and an image-side surface, both of which are aspherical. The object-side surface of the fifth lens element E5 has an inflection point.

[0239] The sixth lens element E6 with positive refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The sixth lens element E6 is made of plastic material and has an object-side surface and an image-side surface, both of which are aspherical. The object-side surface of the sixth lens element E6 has an inflection point.

[0240] The seventh lens element E7 with negative refractive power has an object-side surface that is concave in a paraxial region thereof and an image-side surface that is convex in a paraxial region thereof. The seventh lens element E7 is made of plastic material and has an object-side surface and an image-side surface, both of which are aspherical. The object-side surface of the seventh lens element E7 has an inflection point. The image-side surface of the seventh lens element E7 has an inflection point.

[0241] The eighth lens element E8 with positive refractive power has an object-side surface that is convex in a paraxial region thereof and an image-side surface that is concave in a paraxial region thereof. The eighth lens element E8 is made of plastic material and has an object-side surface and an image-side surface, both of which are aspherical. The object-side surface of the eighth lens element E8 has an inflection point. The image-side surface of the eighth lens element E8 has an inflection point. The object-side surface of the eighth lens element E8 has a critical point in an off-axis region thereof. The image-side surface of the eighth lens element E8 has a critical point in an off-axis region thereof.

[0242] The E9 filter is made of glass and is located between the eighth lens element E8 and the image surface IMG. It does not affect the focal length of the imaging optical lens assembly. The image sensor IS is located on or near the image surface IMG of the imaging optical lens assembly.

[0243] The detailed optical data of the 10th embodiment are shown in Table 10A and the aspherical surface data in Table 10B below. TABLE 10A 10. Embodiment f = 6.31 mm, Fno = 1.64, HFOV = 46.5 degrees Surface # radius of curvature thickness material index Abbé # focal length 0 object infinity infinity 1 Lens 1 -14,9270 (ASP) 0,700 Glass 1,497 81,6 -7,44 2 4,9902 (ASP) 1,726 3 aperture Plano 0,138 4 Lens 2 45,6898 (ASP) 2,558 plastic 1,614 25,7 14,32 5 -10,6519 (ASP) -0,069 6 Aperture diaphragm Plano 1,706 7 Lens 3 -13,9728 (ASP) 0,800 Glass 1,808 22,7 -10,99 8 25,0000 (ASP) 0,201 9 Lens 4 33,2816 (ASP) 1,909 Glass 1,729 54,7 10,27 10 -9,4340 (ASP) -0,876 11 aperture Plano 0,926 12 Lens 5 10,5045 (ASP) 2,805 Glass 1,640 60,2 11,79 13 -24,0077 (ASP) 0,174 14 Lens 6 -54,3117 (ASP) 2,092 plastic 1,544 55,9 25,27 15 -11,1111 (ASP) 0,554 16 Lens 7 -10,1054 (ASP) 0,757 plastic 1,656 21,3 -16,92 17 -116,0921 (ASP) 3,825 18 Lens 8 4,3908 (ASP) 1,398 plastic 1,544 55,9 30,97 19 5,2741 (ASP) 1,855 20 filter Plano 0,900 Glass 1,517 64,2 - 21 Plano 0,921 22 Picture Plano - Note: The reference wavelength is 587.6 nm (d-line). An effective radius of the aperture S1 (surface 3) is 2.923 mm. An effective radius of the aperture S2 (surface 11) is 4.218 mm. TABLE 10B Aspherical coefficients Surface # 1 2 4 5 7 8 k = -7,41771E+01 3,62481E-01 -5,42284E+01 7,72644E+00 -9,28384E+00 -5,63204E+01 A4 = 2,899E-04 2,423E-03 -1,031E-03 7,812E-04 2,888E-03 3,080E-03 A6 = -5,020E-05 -4,013E-04 -3,144E-04 -1,315E-06 -6,695E-04 -5,792E-04 A8 = 6,423E-06 3,921E-05 8,796E-05 -4,753E-05 7,569E-05 5,527E-05 A10 = -3,578E-07 -1,235E-06 -1,890E-05 1,270E-05 -4,423E-06 -2,464E-06 A12 = 7,434E-09 -2,692E-08 2,159E-06 -1,784E-06 8,710E-08 3,849E-08 A14 = - - -1,270E-07 1,308E-07 - - A16 = - - 2,445E-09 -3,788E-09 - - Surface # 9 10 12 13 14 15 k = -5,88285E+01 -1,41571E+00 -3,90819E-01 1,39956E+00 -8,78937E+01 2,36422E+00 A4 = 1,144E-03 -3,029E-04 -6,455E-04 1,072E-04 1,707E-04 -7,542E-05 A6 = -6,887E-05 4,235E-05 3,489E-05 -1,092E-04 -1,090E-04 4,455E-05 A8 = 1,754E-06 4,910E-06 7,822E-08 1,169E-05 1,366E-05 -6,760E-06 A10 = 5,260E-08 -6,844E-07 -1,846E-08 -4,530E-07 -6,432E-07 5,524E-07 A12 = -2,850E-09 1,926E-08 -8,468E-11 5,971E-09 9,874E-09 -2,207E-08 A14 = - - - - - 3,287E-10 Surface # 16 17 18 19 - - k = 2,17515E+00 -9,00000E+01 -3,27468E+00 -4,54733E+00 - - A4 = -2,333E-03 -3,529E-03 -6,595E-04 -2,870E-05 - - A6 = 6,010E-04 6,355E-04 1,950E-05 -2,221E-04 - - A8 = -6,664E-05 -6,053E-05 -3,440E-05 7,685E-06 - - A10 = 3,773E-06 3,157E-06 4,601E-06 4,450E-07 - - A12 = -1,112E-07 -8,792E-08 -3,050E-07 -5,888E-08 - - A14 = 1,392E-09 1,051E-09 1,001E-08 2,247E-09 - - A16 = - - -1,312E-10 -2,997E-11 - -

[0244] In the 10th embodiment, the equation for the aspherical surface profiles of the above-mentioned lens elements is the same as that of the 1st embodiment. The definitions of these parameters, listed in Table 10C below, are also the same as those in the 1st embodiment, with corresponding values ​​for the 10th embodiment, so no further explanation is given in this regard.

[0245] In addition, these parameters from Table 10A and Table 10B can be calculated as the following values ​​and satisfy the following conditions: TABLE 10C Werte optischer und physikalischer Parameter / Definitionen f [mm] 6,31 CT7 / CT1 1,08 Fno 1,64 T34 / CT6 0,10 HFOV [Grad] 46,5 CT8 / CT5 0,50 FOV [Grad] 93,0 |Dsr5 / Dsr9| 0,37 tan(HFOV) 1,05 (T12+T34) / CT6 0,99 TD / EPD 5,54 (V3+V7) / V1 0,5 TL / f 3,96 V3+V7+V8 99,9 (|f1|+|f7|) / (|f2|+|f8|) 0,54 V4 / N4 31,64 f / f2+f / f3+f / f8 0,07 (N2+N6) / N3 1,75 f / f1 +f / f7 -1,22 ET4 / ET5 0,69 |f4 / R7| 0,31 Y5R2 / Y6R2 1,01 |R2 / R3| 0,11 SAG1 R2 / ET1 0,55 R8 / R9 -0,90 Y5R1 / Y3R2 1,32 (R11+R12) / (R11-R12) 1,51 ET6 / ET7 0,53 (R13+R14) / (R13-R14) -1,19 SAG7R1 / CT7 -1,88 (R14-R15) / (R14+R15) 1,08 V2 25,7 11. Embodiment

[0246] Fig. 21 is a perspective view of an image sensing unit according to the 11th embodiment of the present disclosure. In this embodiment, an image sensing unit 100 is a camera module including a lens unit 101, a driving device 102, an image sensor 103, and an image stabilizer 104. The lens unit 101 includes the imaging optical lens assembly as disclosed in the first embodiment, a cylinder, and a holding member (the reference numerals of which are omitted) for holding the imaging optical lens assembly. However, the lens unit 101 may alternatively be provided with the imaging optical lens assembly as disclosed in other embodiments of the present disclosure, and the present disclosure is not limited thereto.The imaging light converges in the lens unit 101 of the image capture unit 100 to form an image, the drive device 102 is used to focus the image on the image sensor 103, and the formed image is then digitally transmitted to another electronic component for further processing.

[0247] The drive device 102 may have an autofocus function, and various drive configurations can be achieved by using voice coil motors (VCMs), microelectromechanical systems (MEMS), piezoelectric systems, or shape memory alloys. The drive device 102 is advantageous for obtaining a better imaging position of the lens unit 101, so that the lens unit 101 can capture a clear image of the imaged object at different distances from the object. The image sensor 103 (e.g., CMOS or CCD), which may have high light sensitivity and low noise, is arranged on the image surface of the imaging optical lens assembly to achieve higher image quality.

[0248] The image stabilizer 104, such as an accelerometer, a gyro sensor, and a Hall-effect sensor, is configured to work with the drive device 102 to enable optical image stabilization (OIS). The drive device 102, working in conjunction with the image stabilizer 104, is useful for compensating for pan and tilt of the lens unit 101, thus reducing motion blur during exposure. In some cases, compensation can be achieved through electronic image stabilization (EIS) using image processing software, which improves image quality in motion or low-light conditions. 12. Embodiment

[0249] Fig. 22 is a perspective view of an electronic device according to the 12th embodiment of the present disclosure. Fig. 23 is another perspective view of the electronic device in Fig. 22. Fig. 24 is a block diagram of the electronic device in Fig. 22.

[0250] In this embodiment, an electronic device 200 is a smartphone that includes the image capture unit 100 as disclosed in the 11th embodiment, an image capture unit 100a, an image capture unit 100b, an image capture unit 100c, an image capture unit 100d, an image capture unit 100e, a flash module 201, a focus assist module 202, an image signal processor 203, a display module 204, and an image software processor 205. The image capture unit 100, the image capture unit 100a, and the image capture unit 100b are arranged on the same side of the electronic device 200, and each of the image capture units 100, 100a, and 100b has a single focal point. The focus assist module 202 may be a laser distance meter or a ToF (Time of Flight) module, but the present disclosure is not limited thereto.The image capture unit 100c, the image capture unit 100d, the image capture unit 100e, and the display module 204 are arranged on the opposite side of the electronic device 200, and the display module 204 may be a user interface, so the image capture units 100c, 100d, and 100e may be front-facing cameras of the electronic device 200 for taking selfies, but the present disclosure is not limited thereto. Furthermore, each of the image capture units 100a, 100b, 100c, 100d, and 100e may include the imaging optical lens assembly of the present disclosure and have a similar configuration to the image capture unit 100. Specifically, each of the image sensing units 100a, 100b, 100c, 100d, and 100e may include a lens unit, a driving device, an image sensor, an image stabilizer, and a light folding element for folding the optical path.In addition, each lens unit of the image acquisition units 100a, 100b, 100c, 100d, and 100e may include the imaging optical lens assembly of the present disclosure, a cylinder, and a support member for supporting the imaging optical lens assembly.

[0251] The image capture unit 100 is a wide-angle image capture unit, the image capture unit 100a is a telephoto image capture unit with an optical path folding function, the image capture unit 100b is an ultra-wide-angle image capture unit, the image capture unit 100c is a wide-angle image capture unit, the image capture unit 100d is an ultra-wide-angle image capture unit, and the image capture unit 100e is a time-of-flight image capture unit. In this embodiment, the image capture units 100, 100a, and 100b have different fields of view, so that the electronic device 200 can have different magnification ratios to meet the requirements of the optical zoom functionality. In addition, the image capture unit 100e can determine depth information of the imaged object. Furthermore, the light folding configuration of the image capture unit 100a can, for example, be one of the Fig. 33 to Fig. 35 shown configurations, which are referred to in the preceding descriptions Fig. 33 to Fig. 35, and the details thereof will not be repeated. Furthermore, each of the image acquisition units 100, 100b, 100c, 100d, and 100e may have a light folding configuration, for example, corresponding to one of the Fig. 33 to Fig. 35 shown configurations, which are referred to in the above descriptions Fig. 33 to Fig. 35. In this embodiment, the electronic device 200 includes a plurality of image capture units 100, 100a, 100b, 100c, 100d, and 100e, but the present disclosure is not limited to the number and arrangement of the image capture units.

[0252] When a user captures images of an object 206, the light beams converge in the image capture unit 100, the image capture unit 100a, or the image capture unit 100b to create images, and the flash module 201 is activated to amplify the light. The focus assist module 202 detects the distance of the imaged object 206 to achieve fast automatic focusing. The image signal processor 203 is configured to optimize the captured image to improve image quality. The light beam emitted by the focus assist module 202 can be either conventional infrared light or laser light. Furthermore, the light beams can converge in the image capture unit 100c, 100d, or 100e to create images.The display module 204 may include a touchscreen, and the user may interact with the display module 204 and the image software processor 205, which has multiple functions for image acquisition and complete image processing. Alternatively, the user may capture images using a physical button. The image processed by the image software processor 205 may be displayed on the display module 204. 13. Embodiment

[0253] Fig. 25 is a schematic view of an electronic device according to the 13th embodiment of the present disclosure. Fig. 26 is another schematic view of the electronic device in Fig. 25.

[0254] In this embodiment, an electronic device 300 is a smartphone that includes the image capture unit 100 as disclosed in the 11th embodiment, an image capture unit 100f, an image capture unit 100g, an image capture unit 100h, and a display module 301. As shown in Fig. As shown in Figure 25, the image capture unit 100, the image capture unit 100f, and the image capture unit 100g are arranged on the same side of the electronic device 300, and each of the image capture units 100, 100f, and 100g has a single focal point. As shown in Fig. As shown in Figure 26, the image capture unit 100h and the display module 301 are arranged on the opposite side of the electronic device 300, so that the image capture unit 100h may be a front-facing camera of the electronic device 300 for taking selfies, but the present disclosure is not limited thereto. Furthermore, each of the image capture units 100f, 100g, and 100h may include the imaging optical lens assembly of the present disclosure and have a similar configuration to the image capture unit 100. Specifically, each of the image capture units 100f, 100g, and 100h may include a lens unit, a driving device, an image sensor, and an image stabilizer.Furthermore, each lens unit of the image capturing units 100f, 100g, and 100h may include the imaging optical lens assembly of the present disclosure, a cylinder, and a support member for supporting the imaging optical lens assembly.

[0255] Image capture unit 100 is a wide-angle image capture unit, image capture unit 100f is a telephoto image capture unit, image capture unit 100g is an ultra-wide-angle image capture unit, and image capture unit 100h is a wide-angle image capture unit. In this embodiment, image capture units 100, 100f, and 100g have different fields of view, so that electronic device 300 can have different magnification ratios to meet the requirements of the optical zoom functionality. In this embodiment, electronic device 300 includes multiple image capture units 100, 100f, 100g, and 100h, but the present disclosure is not limited to the number and arrangement of the image capture units. 14. Embodiment

[0256] Fig. 27 is a perspective view of an electronic device according to the 14th embodiment of the present disclosure.

[0257] In this embodiment, an electronic device 400 is a smartphone that includes the image capture unit 100 as disclosed in the 11th embodiment, an image capture unit 100i, an image capture unit 100j, an image capture unit 100k, an image capture unit 100m, an image capture unit 100n, an image capture unit 100p, an image capture unit 100q, an image capture unit 100r, a flash module 401, a focus assist module, an image signal processor, a display module, and an image software processor (not shown). The image capture units 100, 100i, 100j, 100k, 100m, 100n, 100p, 100q and 100r are arranged on the same side of the electronic device 400, while the display module is arranged on the opposite side of the electronic device 400.Furthermore, each of the image acquisition units 100i, 100j, 100k, 100m, 100n, 100p, 100q, and 100r may include the imaging optical lens assembly of the present disclosure and have a similar configuration to the image acquisition unit 100, and the details thereof will not be repeated.

[0258] The image acquisition unit 100 is a wide-angle image acquisition unit, the image acquisition unit 100i is a telephoto image acquisition unit with folding optical path, the image acquisition unit 100j is a telephoto image acquisition unit with folding optical path, the image acquisition unit 100k is a wide-angle image acquisition unit, the image acquisition unit 100m is an ultra-wide-angle image acquisition unit, the image acquisition unit 100n is an ultra-wide-angle telephoto image acquisition unit, the image acquisition unit 100p is a telephoto image acquisition unit, the image acquisition unit 100q is a telephoto image acquisition unit, and the image acquisition unit 100r is a time-of-flight image acquisition unit.In this embodiment, the image acquisition units 100, 100i, 100j, 100k, 100m, 100n, 100p, and 100q have different fields of view, so that the electronic device 400 can have different magnification ratios to meet the requirements of the optical zoom functionality. Furthermore, the image acquisition unit 100r can determine depth information of the imaged object. Furthermore, the light folding configuration of the image acquisition units 100i and 100j can, for example, be one of the configurations shown in FIG. Fig. 33 to Fig. 35 shown structures referred to in the preceding descriptions concerning Fig. 33 to Fig. 35, and the details thereof will not be repeated. In this embodiment, the electronic device 400 includes a plurality of image capture units 100, 100i, 100j, 100k, 100m, 100n, 100p, 100q, and 100r, but the present disclosure is not limited to the number and arrangement of the image capture units. When a user captures images of an object, the light beams converge in the image capture unit 100, 100i, 100j, 100k, 100m, 100n, 100p, 100q, or 100r to form images, and the flash module 401 is activated to amplify the light. The subsequent processes are performed in a similar manner to the above-mentioned embodiments, and the details thereof will not be repeated. 15. Embodiment

[0259] Fig. 28 is a perspective view of an electronic device according to the 15th embodiment of the present disclosure. Fig. 29 is a side view of the electronic device in Fig. 28. Fig. 30 is a plan view of the electronic device in Fig. 28.

[0260] In this embodiment, the electronic device 500 is an automobile, such as a car. The electronic device 500 includes a plurality of image capture units 501, and the image capture units 501 each include, for example, the imaging optical lens assembly of the present disclosure. The image capture units 501 can serve, for example, as in-car panoramic view cameras, dashboard cameras, and vehicle rearview cameras. Each of the image capture units 501 can be a wide-angle image capture unit.

[0261] As in the Fig. As shown in Figures 28 to 30, the image acquisition units 501 are arranged, for example, at the front, rear, side, side mirrors, and interior of the automobile, respectively, to capture images of the perimeter of the automobile and detect road conditions outside the automobile, thereby achieving automatic driver assistance. Furthermore, the image software processor can stitch the images into a panoramic image so that the driver can see every corner around the car, facilitating driving and parking.

[0262] As in Fig. 29, the image capture units 501 are arranged, for example, in the lower part of the left and right side mirrors, respectively, to capture images in the areas of the left and right lanes. As shown in Fig.As shown in Figure 30, the image acquisition units 501 are arranged, for example, inside the side mirrors and the front and rear windshields, respectively, to provide external information to the driver and also provide more viewing angles to reduce blind spots and thereby improve driving safety. The arrangement of the aforementioned image acquisition units is only an example, and the number, positions, or imaging directions of the image acquisition units can be adjusted according to actual requirements.

[0263] The smartphone and mobile vehicle in the embodiments are merely examples of illustrating the image acquisition unit of the present disclosure installed in an electronic device, and the present disclosure is not limited thereto. The image acquisition unit can optionally be applied to moving-focus optical systems. Furthermore, the imaging optical lens assembly of the image acquisition unit features good aberration correction capability and high image quality, and can be used for 3D image acquisition applications in products such as digital cameras, mobile devices, digital tablets, smart TVs, network monitoring devices, dashboard cameras, vehicle rearview cameras, multi-camera devices, image recognition systems, motion-sensitive input devices, unmanned aerial vehicles, wearable devices, portable video recorders, and other electronic imaging devices.

[0264] The foregoing description has been made with reference to specific embodiments for the purpose of illustration. It should be noted that TABLES 1A-10C show different data for the various embodiments; however, the data for the various embodiments are derived from experiments. The embodiments were chosen and described in order to best explain the principles of the disclosure and their practical applications, to enable others skilled in the art to best utilize the disclosure and various embodiments with various modifications as are suited to their particular use. The above-illustrated embodiments and the accompanying drawings are exemplary and are not intended to be exhaustive or to limit the scope of the present disclosure to the precise forms disclosed. Many modifications and variations are possible in light of the above teachings.

Claims

[1] An imaging optical lens assembly comprising eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), wherein the eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8) are, in order from an object side to an image side along an optical 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), and wherein each of the eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8) has an object-side surface facing the object side and an image-side surface facing the image side; wherein the fourth lens element (E4) has a positive refractive power, the fifth lens element (E5) has a positive refractive power, the object-side surface of the seventh lens element (E7) is concave in a paraxial region thereof, the object-side surface of the eighth lens element (E8) has at least one inflection point (P), and the imaging optical lens assembly further comprises an aperture stop (ST) arranged between an imaged object and the fourth lens element (E4); and wherein an axial distance between the object-side surface of the first lens element (E1) and an image surface (IMG) is TL, a focal length of the imaging optical lens assembly is f, an axial distance between the first lens element (E1) and the second lens element (E2) is T12, an axial distance between the third lens element (E3) and the fourth lens element (E4) is T34, a central thickness of the sixth lens element (E6) is CT6, and the following conditions are met: 3.00 <TL / f<6,00; and 0.05<(T12+T34) / CT6<1.

50. [2] An imaging optical lens assembly according to claim 1, wherein the first lens element (E1) has a negative refractive power, the sixth lens element (E6) has a positive refractive power, the image-side surface of the fourth lens element (E4) is convex in a paraxial region thereof, the image-side surface of the fifth lens element (E5) is convex in a paraxial region thereof, the object-side surface of the eighth lens element (E8) is convex in a paraxial region thereof, and at least one lens element is made of glass material and at least one lens element is made of plastic material in the imaging optical lens assembly. [3] An imaging optical lens assembly according to claim 1, wherein a radius of curvature of the image-side surface of the fourth lens element (E4) is R8, a radius of curvature of the object-side surface of the fifth lens element (E5) is R9, half of a maximum field of view of the imaging optical lens assembly is HFOV, and the following conditions are satisfied: −10.00 <R8 / R9<0,15; and 0.82 <tan(HFOV)<2,75. [4] An imaging optical lens assembly according to claim 1, wherein the aperture stop (ST) is arranged between the first lens element (E1) and the third lens element (E3); and wherein a focal length of the first lens element (E1) is f1, a focal length of the second lens element (E2) is f2, a focal length of the seventh lens element (E7) is f7, a focal length of the eighth lens element (E8) is f8, and the following condition is satisfied: 0.00≤(|f1|+|f7|) / (|f2|+|f8|)<0.

62. [5] An imaging optical lens assembly according to claim 1, wherein the imaging optical lens assembly comprises at least one cemented lens set, and the at least one cemented lens set is formed by cementing two adjacent lens elements from the first lens element (E1), the second lens element (E2), the third lens element (E3), the fourth lens element (E4), the fifth lens element (E5), the sixth lens element (E6), the seventh lens element (E7), and the eighth lens element (E8); and wherein a radius of curvature of the image-side surface of the first lens element (E1) is R2, a radius of curvature of the object-side surface of the second lens element (E2) is R3, and the following condition is satisfied: 0.00≤|R2 / R3|<0.

45. [6] An imaging optical lens assembly according to claim 1, wherein an Abbe number of the fourth lens element (E4) is V4, a refractive index of the fourth lens element (E4) is N4, and the following condition is satisfied: 6.50 <V4 / N4<35,70. [7] An imaging optical lens assembly according to claim 1, wherein a refractive index of the second lens element (E2) is N2, a refractive index of the third lens element (E3) is N3, a refractive index of the sixth lens element (E6) is N6, and the following condition is satisfied: 1.25<(N2+N6) / N3<1.

85. [8] An imaging optical lens assembly according to claim 1, wherein an f-number of the imaging optical lens assembly is Fno, a distance parallel to an optical axis between a position of the maximum effective radius of the object-side surface of the fourth lens element (E4) and a position of the maximum effective radius of the image-side surface of the fourth lens element (E4) is ET4, a distance parallel to the optical axis between a position of the maximum effective radius of the object-side surface of the fifth lens element (E5) and a position of the maximum effective radius of the image-side surface of the fifth lens element (E5) is ET5, and the following conditions are satisfied: 1.30 <Fno<1,85; und 0.15 <ET4 / ET5<3,00 [9] An imaging optical lens assembly according to claim 1, wherein a maximum effective radius of the image-side surface of the fifth lens element (E5) is Y5R2, a maximum effective radius of the image-side surface of the sixth lens element (E6) is Y6R2, and the following condition is satisfied: 0.75 <Y5R2 / Y6R2<1,30. [10] Image acquisition unit (1, 100) comprising: the imaging optical lens assembly according to claim 1; and an image sensor (IS, 103) arranged on the image surface (IMG) of the imaging optical lens assembly. [11] Electronic device (200) comprising: the image acquisition unit (1, 100) according to claim 10. [12] An imaging optical lens assembly comprising eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8), wherein the eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8) are, in order from an object side to an image side along an optical 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), and each of the eight lens elements (E1, E2, E3, E4, E5, E6, E7, and E8) has an object-side surface facing the object side and an image-side surface facing the image side; wherein the fifth lens element (E5) has a positive refractive power, the sixth lens element (E6) has a positive refractive power, the image-side surface of the fourth lens element (E4) is convex in a paraxial region thereof, the object-side surface of the eighth lens element (E8) is convex in a paraxial region thereof, the object-side surface of the eighth lens element (E8) has at least one inflection point (P), and the imaging optical lens assembly further comprises an aperture stop (ST) arranged between an imaged object and the fourth lens element (E4); and wherein an axial distance between the object-side surface of the first lens element (E1) and an image surface (IMG) is TL, a focal length of the imaging optical lens assembly is f, a focal length of the second lens element (E2) is f2, a focal length of the third lens element (E3) is f3, a focal length of the eighth lens element (E8) is f8, a radius of curvature of the object-side surface of the sixth lens element (E6) is R11, a radius of curvature of the image-side surface of the sixth lens element (E6) is R12, and the following conditions are met: 3.00 <TL / f<6,00; −1.50 <f / f2+f / f3+f / f8<0,38; and −3.00<(R11+R12) / (R11−R12)<3.

00. [13] An imaging optical lens assembly according to claim 12, wherein the first lens element (E1) has a negative refractive power, the fourth lens element (E4) has a positive refractive power, the image-side surface of the first lens element (E1) is concave in a paraxial region thereof, the image-side surface of the fifth lens element (E5) is convex in a paraxial region thereof, the object-side surface of the eighth lens element (E8) is convex in a paraxial region thereof, and the object-side surface and the image-side surface of the seventh lens element (E7) are both aspherical. [14] An imaging optical lens assembly according to claim 12, wherein an axial distance between the object-side surface of the first lens element (E1) and the image-side surface of the eighth lens element (E8) is TD, an entrance pupil diameter of the imaging optical lens assembly is EPD, and the following condition is satisfied: 5.10 <TD / EPD<8,00. [15] An imaging optical lens assembly according to claim 12, wherein the focal length of the imaging optical lens assembly is f, a focal length of the first lens element (E1) is f1, a focal length of the seventh lens element (E7) is f7, and the following condition is satisfied: −1.75 <f / f1+f / f7<−0,85. [16] An imaging optical lens assembly according to claim 12, wherein a central thickness of the first lens element (E1) is CT1, a central thickness of the sixth lens element (E6) is CT6, a central thickness of the seventh lens element (E7) is CT7, an axial distance between the third lens element (E3) and the fourth lens element (E4) is T34, and the following conditions are satisfied: 0.10 <CT7 / CT1<2,10; and 0.00≤T34 / CT6<1.

10. [17] An imaging optical lens assembly according to claim 12, wherein a radius of curvature of the image-side surface of the first lens element (E1) is R2, a radius of curvature of the object-side surface of the second lens element (E2) is R3, and the following condition is satisfied: 0.00≤|R2 / R3|<0.60 [18] An imaging optical lens assembly according to claim 12, wherein an Abbe number of the first lens element (E1) is V1, an Abbe number of the third lens element (E3) is V3, an Abbe number of the seventh lens element (E7) is V7, a radius of curvature of the object-side surface of the seventh lens element (E7) is R13, a radius of curvature of the image-side surface of the seventh lens element (E7) is R14, and the following conditions are satisfied: 0.3<(V3+V7) / V1<1.0; and −1.70<(R13+R14) / (R13−R14)<0.

70. [19] An imaging optical lens assembly according to claim 12, wherein a displacement parallel to an optical axis from an axial vertex of the image-side surface of the first lens element (E1) to a position of the maximum effective radius of the image-side surface of the first lens element (E1) is SAG1R2, a distance parallel to the optical axis between a position of the maximum effective radius of the object-side surface of the first lens element (E1) and the position of the maximum effective radius of the image-side surface of the first lens element (E1) is ET1, a maximum effective radius of the image-side surface of the third lens element (E3) is Y3R2, a maximum effective radius of the object-side surface of the fifth lens element (E5) is Y5R1, and the following conditions are satisfied: 0.20 <SAG1R2 / ET1<0,85; and 1.00 <Y5R1 / Y3R2<3,50. [20] An imaging optical lens assembly according to claim 12, wherein a distance parallel to an optical axis between a position of the maximum effective radius of the object-side surface of the sixth lens element (E6) and a position of the maximum effective radius of the image-side surface of the sixth lens element (E6) is ET6, a distance parallel to the optical axis between a position of the maximum effective radius of the object-side surface of the seventh lens element (E7) and a position of the maximum effective radius of the image-side surface of the seventh lens element (E7) is ET7, and the following condition is satisfied: 0.28 <ET6 / ET7<1,10. [21] An imaging optical lens assembly comprising eight lens elements (E1, E2, E3, E4, E5, E6, E7 and E8), wherein the eight lens elements (E1, E2, E3, E4, E5, E6, E7 and E8) are, in order from an object side to an image side along an optical 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), and wherein each of the eight lens elements (E1, E2, E3, E4, E5, E6, E7 and E8) has an object-side surface facing the object side and an image-side surface facing the image side; wherein the fourth lens element (E4) has a positive refractive power, the fifth lens element (E5) has a positive refractive power, the sixth lens element (E6) has a positive refractive power, the image-side surface of the fifth lens element (E5) is convex in a paraxial region thereof, the object-side surface of the eighth lens element (E8) has at least one inflection point (P), and the imaging optical lens assembly further comprises an aperture stop (ST) arranged between an imaged object and the fourth lens element (E4); and wherein an axial distance between the object-side surface of the first lens element (E1) and an image surface (IMG) is TL, a focal length of the imaging optical lens assembly is f, an Abbe number of the third lens element (E3) is V3, an Abbe number of the seventh lens element (E7) is V7, an Abbe number of the eighth lens element (E8) is V8, and the following conditions are met: 3.00 <TL / f<6,00; and 18.0 <V3+V7+V8<105,0. [22] An imaging optical lens assembly according to claim 21, wherein the image-side surface of the fourth lens element (E4) is convex in a paraxial region thereof, the image-side surface of the sixth lens element (E6) is convex in a paraxial region thereof, the object-side surface of the seventh lens element (E7) is concave in a paraxial region thereof, and the object-side surface of the eighth lens element (E8) is convex in a paraxial region thereof. [23] An imaging optical lens assembly according to claim 21, wherein the aperture stop (ST) is arranged between the first lens element (E1) and the third lens element (E3); and where an Abbe number of the second lens element (E2) is V2 and the following condition is satisfied: 5.0 <V2<53,0. [24] An imaging optical lens assembly according to claim 21, wherein the imaging optical lens assembly comprises at least one cemented lens set, wherein the at least one cemented lens set is formed by cementing two adjacent lens elements of the first lens element (E1), the second lens element (E2), the third lens element (E3), the fourth lens element (E4), the fifth lens element (E5), the sixth lens element (E6), the seventh lens element (E7) and the eighth lens element (E8), and two adjacent cemented surfaces of the two adjacent lens elements are both aspherical. [25] An imaging optical lens assembly according to claim 21, wherein a focal length of the fourth lens element (E4) is f4, a radius of curvature of the image-side surface of the fourth lens element (E4) is R7, and the following condition is satisfied: 0.00≤|f4 / R7|<1.

20. [26] An imaging optical lens assembly according to claim 21, wherein a central thickness of the fifth lens element (E5) is CT5, a central thickness of the eighth lens element (E8) is CT8, an axial distance between the aperture stop (ST) and the object-side surface of the third lens element (E3) is Dsr5, an axial distance between the aperture stop (ST) and the object-side surface of the fifth lens element (E5) is Dsr9, and the following conditions are satisfied: 0.18 <CT8 / CT<1,85; and 0.00<|Dsr5 / Dsr9|<0.

90. [27] An imaging optical lens assembly according to claim 21, wherein a radius of curvature of the image-side surface of the seventh lens element (E7) is R14, a radius of curvature of the object-side surface of the eighth lens element (E8) is R15, and the following condition is satisfied: −0.08<(R14−R15) / (R14+R15)<6.

00. [28] An imaging optical lens assembly according to claim 21, wherein a displacement parallel to an optical axis from an axial vertex of the object-side surface of the seventh lens element (E7) to a position of the maximum effective radius of the object-side surface of the seventh lens element (E7) is SAG7R1, a central thickness of the seventh lens element (E7) is CT7, and the following condition is satisfied: −3.50 <SAG7R1 / CT7<−0,50. [29] An imaging optical lens assembly according to claim 21, wherein the axial distance between the object-side surface of the first lens element (E1) and the image surface (IMG) is TL, the focal length of the imaging optical lens assembly is f, a focal length of the second lens element (E2) is f2, a focal length of the third lens element (E3) is f3, a focal length of the eighth lens element (E8) is f8, an axial distance between the first lens element (E1) and the second lens element (E2) is T12, an axial distance between the third lens element (E3) and the fourth lens element (E4) is T34, a central thickness of the sixth lens element (E6) is CT6, a radius of curvature of the object-side surface of the sixth lens element (E6) is R11, a radius of curvature of the image-side surface of the sixth lens element (E6) is R12, the Abbe number of the third lens element (E3) is V3, the Abbe number of the seventh lens element (E7) is V7,the Abbe number of the eighth lens element (E8) is V8 and the following conditions are met:, 3.90≤TL / f≤5.50; 0.43≤(T12+T34) / CT6≤0.99; −0.16≤f / f2+f / f3+f / f8≤0.14; 0.32≤(R11+R12) / (R11−R12)≤1.51; and 56.4≤V3=V7+V8≤99.9.

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