Imaging lens system, image acquisition unit and electronic device

Abstract

Imaging lens system comprising six lens elements (E1, E2, E3, E4, E5, E6), wherein the six lens elements (E1, E2, E3, E4, E5, E6) are arranged in the order from an object side to an image side along a beam 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) and a sixth lens element (E6), wherein each of the six lens elements (E1, E2, E3, E4, E5, E6) has an object-side surface facing the object side and an image-side surface facing the image side; wherein the first lens element (E1) has a positive refractive power, the second lens element (E2) has a positive refractive power, the image-side surface of the second lens element (E2) is convex in a paraxial region thereof, the third lens element (E3) has a negative refractive power, the object-side surface of the third lens element (E3) is concave in a paraxial region thereof, the image-side surface of the third lens element (E3) is convex in a paraxial region thereof, the fourth lens element (E4) has a negative refractive power, the fifth lens element (E5) has a positive refractive power, the object-side surface of the fifth lens element (E5) 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 sixth lens element (E6) has a negative refractive power,the object-side surface of the sixth lens element (E6) is convex in a paraxial region thereof, the image-side surface of the sixth lens element (E6) is concave in a paraxial region thereof, and the object-side surface of the sixth lens element (E6) has at least one inflection point (P).

Description

BACKGROUND Subject area

[0001] The present disclosure relates to an imaging lens system, an image acquisition unit and an electronic device, in particular an imaging lens system and an image acquisition unit that can be used in 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 decreased. Therefore, high image quality is now one of the essential features of an optical system.

[0003] Furthermore, due to rapid technological advancements, electronic devices equipped with optical systems are increasingly becoming multifunctional for various applications, thereby raising the bar for the functionality of these optical systems. However, with conventional optical systems, it is difficult to strike a balance between requirements such as high image quality, low sensitivity, appropriate aperture, miniaturization, and a desirable field of view. SUMMARY

[0004] According to one aspect of the present disclosure, an imaging lens system comprises six lens elements. The six lens elements are, in order from an object side to an image side along a beam path, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element. Each of the six lens elements has an object side facing the object side and an image-side surface facing the image side.

[0005] Preferably, the first lens element has a positive refractive power. Preferably, the second lens element has a positive refractive power. Preferably, the image-side surface of the second lens element is convex in a paraxial region. Preferably, the third lens element has a negative refractive power. Preferably, the object-side surface of the third lens element is concave in a paraxial region. Preferably, the image-side surface of the third lens element is convex in a paraxial region. Preferably, the fourth lens element has a negative refractive power. Preferably, the fifth lens element has a positive refractive power. Preferably, the object-side surface of the fifth lens element is convex in a paraxial region. Preferably, the image-side surface of the fifth lens element is convex in a paraxial region.Preferably, the sixth lens element has a negative refractive power. Preferably, the object-side surface of the sixth lens element is convex in a paraxial region. Preferably, the image-side surface of the sixth lens element is concave in a paraxial region. Preferably, the object-side surface of the sixth lens element has at least one inflection point.

[0006] According to another aspect of the present disclosure, an imaging lens system comprises six lens elements. The six lens elements are, in order from an object side to an image side along a beam path, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element. Each of the six lens elements has an object-side surface facing the object side and an image-side surface facing the image side.

[0007] Preferably, the first lens element has a positive refractive power. Preferably, the second lens element has a positive refractive power. Preferably, the image-side surface of the second lens element is convex in a paraxial region. Preferably, the third lens element has a negative refractive power. Preferably, the object-side surface of the third lens element is concave in a paraxial region. Preferably, the image-side surface of the third lens element is convex in a paraxial region. Preferably, the fifth lens element has a positive refractive power. Preferably, the object-side surface of the fifth lens element is convex in a paraxial region. Preferably, the sixth lens element has a negative refractive power. Preferably, the object-side surface of the sixth lens element is convex in a paraxial region.Preferably, the image-side surface of the sixth lens element is concave in a paraxial region thereof. Preferably, the object-side surface of the sixth lens element has at least one inflection point.

[0008] If an axial distance between the object-side surface of the first lens element and an image surface TL is, a radius of curvature of the image-side surface of the third lens element is R6, a radius of curvature of the object-side surface of the fourth lens element is R7, and a radius of curvature of the image-side surface of the fourth lens element is R8, then preferably the following conditions are met: 0,0<|TL / R8|<1.20; and 0.00<|R6 / R7|<3.00.

[0009] According to another aspect of the present disclosure, an imaging lens system comprises six lens elements. The six lens elements are, in order from an object side to an image side along a beam path, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element. Each of the six lens elements has an object-side surface facing the object side and an image-side surface facing the image side.

[0010] Preferably, the first lens element has a positive refractive power. Preferably, the second lens element has a positive refractive power. Preferably, the image-side surface of the second lens element is convex in a paraxial region. Preferably, the third lens element has a negative refractive power. Preferably, the object-side surface of the third lens element is concave in a paraxial region. Preferably, the image-side surface of the third lens element is convex in a paraxial region. Preferably, the fifth lens element has a positive refractive power. Preferably, the object-side surface of the fifth lens element is convex in a paraxial region. Preferably, the image-side surface of the fifth lens element is convex in a paraxial region. Preferably, the sixth lens element has a negative refractive power.Preferably, the object-side surface of the sixth lens element is convex in a paraxial region. Preferably, the image-side surface of the sixth lens element is concave in a paraxial region. Preferably, the object-side surface of the sixth lens element has at least one inflection point.

[0011] If 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 fifth lens element is R9, then the following condition is preferably met: 0.00<|R9 / R2|<0.70.

[0012] According to another aspect of the present disclosure, an image acquisition unit comprises one of the above-mentioned imaging lens systems and an image sensor, wherein the image sensor is arranged on the image surface of the imaging lens system.

[0013] According to another aspect of the present disclosure, an electronic device comprises the aforementioned image capture unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The disclosure can be better understood by reading the following detailed description of the embodiments with reference to the accompanying drawings: Fig. Figure 1 is a schematic view of an image acquisition unit according to the first embodiment of the present disclosure; Fig. Figure 2 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the first embodiment; Fig. Figure 3 is a schematic view of an image acquisition unit according to the second embodiment of the present disclosure; Fig. Figure 4 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the second embodiment; Fig. Figure 5 is a schematic view of an image acquisition unit according to the 3rd embodiment of the present disclosure; Fig. Figure 6 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the 3rd embodiment; Fig. Figure 7 is a schematic view of an image acquisition unit according to the 4th embodiment of the present disclosure; Fig. Figure 8 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the 4th embodiment; Fig. Figure 9 is a schematic view of an image acquisition unit according to the 5th embodiment of the present disclosure; Fig. Figure 10 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the 5th embodiment; Fig.Figure 11 is a schematic view of an image acquisition unit according to the 6th embodiment of the present disclosure; Fig. Figure 12 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the 6th embodiment; Fig. Figure 13 is a schematic view of an image acquisition unit according to the 7th embodiment of the present disclosure; Fig. Figure 14 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the 7th embodiment; Fig. Figure 15 is a perspective view of an image acquisition unit according to the 8th embodiment of the present disclosure; Fig. Figure 16 is a perspective view of an electronic device according to the 9th embodiment of the present disclosure; Fig. Figure 17 is another perspective view of the electronic device in Fig. 16; Fig. Figure 18 is a perspective view of an electronic device according to the 10th embodiment of the present disclosure; Fig. Figure 19 is another perspective view of the electronic device in Fig. 18; Fig. 20 is a block diagram of the electronic device in Fig. 18; Fig. Figure 21 is a perspective view of an electronic device according to the 11th embodiment of the present disclosure; Fig. Figure 22 is a perspective view of an electronic device according to the 12th embodiment of the present disclosure; Fig. Figure 23 shows a schematic view of inflection points on lens surfaces and critical points on lens surfaces according to the first embodiment of the present disclosure; Fig.Figure 24 shows a schematic view of ET34, Y1R1 and Y6R2 according to the first embodiment of the present disclosure; Fig. Figure 25 shows a schematic view of a configuration of a light deflection element in an imaging lens system according to an embodiment of the present disclosure; Fig. Figure 26 shows a schematic view of a further configuration of a light deflection element in an imaging lens system according to an embodiment of the present disclosure; and Fig. Figure 27 shows a schematic view of a configuration of two light deflection elements in an imaging lens system according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0015] An imaging lens system comprises six lens elements. These six lens elements, in order from an object side to an image side along a beam path, are a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element. Each of the six lens elements has an object-side surface facing the object side and an image-side surface facing the image side.

[0016] The first lens element can have a positive refractive power. Therefore, this is advantageous for reducing the overall size and improving the light-focusing capability of the imaging lens system.

[0017] The second lens element can have a positive refractive power. Therefore, it is advantageous to divide the light-focusing capacity at the object end of the imaging lens system and thereby correct aberrations. The image-side surface of the second lens element can be convex in a paraxial region. Therefore, it is advantageous to reduce the beam angle of the light exiting the second lens element and thus reduce stray light.

[0018] The third lens element can have a negative refractive power. Therefore, it is advantageous to correct the spherical aberration produced by the first and second lens elements. The object-side surface of the third lens element can be concave in a paraxial region. Therefore, it is advantageous to interact with the image-side surface of the second lens element in the lens shape, thereby improving the reception of peripheral light and thus increasing the illuminance at the image edge. The image-side surface of the third lens element can be convex in a paraxial region. Therefore, it is advantageous to adjust the direction of light emission and thus prevent total internal reflection.

[0019] The fourth lens element can have a negative refractive power. Therefore, it is advantageous to work in conjunction with the third lens element to correct spherical aberration caused by the first and second lens elements.

[0020] The fifth lens element can have a positive refractive power. Therefore, it is advantageous to provide sufficient light focusing capability at the image end of the imaging lens system. The object-side surface of the fifth lens element can be convex in a paraxial region. Therefore, it is advantageous to adjust the lens shape of the fifth lens element, thereby aiding in light focusing and the adjustment of the posterior focal length. The image-side surface of the fifth lens element can also be convex in a paraxial region. Therefore, it is advantageous to adjust the lens shape of the fifth lens element, thereby improving its positive refractive power.

[0021] The sixth lens element can have a negative refractive power. Therefore, it is advantageous to balance the refractive power configuration at the image end of the imaging lens system to correct aberrations. The object-side surface of the sixth lens element can be convex in a paraxial region. Therefore, it is advantageous to adjust the shape of the sixth lens element to correct off-axis field curvature. The image-side surface of the sixth lens element can be concave in a paraxial region. Therefore, it is advantageous to adjust the shape of the sixth lens element to adjust the posterior focal length.

[0022] According to the present disclosure, the object-side surface of the sixth lens element can have at least one inflection point. Therefore, it is advantageous for correcting aberrations at the image edge while simultaneously reducing the overall size. See Fig.Figure 23 shows a schematic view of inflection points P on the object-side surface of the sixth lens element E6 according to the first embodiment of the present disclosure. The aforementioned inflection points P on the object-side surface of the sixth lens element E6, as well as the inflection points P on the object-side surface of the first lens element E1, the image-side surface of the first lens element E1, the object-side surface of the second lens element E2, the object-side surface of the third lens element E3, the image-side surface of the third lens element E3, the object-side surface of the fourth lens element E4, the image-side surface of the fourth lens element E4, the object-side surface of the fifth lens element E5, the image-side surface of the fifth lens element E5, and the image-side surface of the sixth lens element E6 in Fig.Figures 23 are examples. Each of the lens surfaces in different embodiments of the present disclosure may also have one or more inflection points.

[0023] If the axial distance between the object-side surface of the first lens element and an image surface is TL, and the radius of curvature of the image-side surface of the fourth lens element is R8, the following condition can be satisfied: 0.00 < |TL / R8| < 1.20. Therefore, it is advantageous to adjust the ratio of the total path length of the imaging lens system to the radius of curvature of the image-side surface of the fourth lens element, thereby adjusting the lens shape and refractive power of the fourth lens element to improve image quality. Furthermore, the following conditions can also be satisfied: 0.00 < |TL / R8| < 1.00. Furthermore, the following conditions can also be satisfied: 0.05 < |TL / R8| < 0.90. Furthermore, the following condition can also be satisfied: 0.09 ≤ |TL / R8| ≤ 0.88.

[0024] If the radius of curvature of the image-side surface of the third lens element is R6 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 < |R6 / R7| < 3.00. Therefore, this is advantageous for controlling the deflection angle of the light in the imaging lens system and correcting aberrations. Furthermore, the following conditions can also be satisfied: 0.00 < |R6 / R7| < 2.00. Furthermore, the following conditions can also be satisfied: 0.00 < |R6 / R7| < 1.50. Furthermore, the following conditions can also be satisfied: 0.00 < |R6 / R7| < 1.20. Furthermore, the following condition can also be satisfied: 0.09 ≤ |R6 / R7| ≤ 1.04.

[0025] If 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 fifth lens element is R9, the following condition can be satisfied: 0.00 < |R9 / R2| < 0.70. Therefore, this is advantageous for controlling the direction of light propagation in the imaging lens system, thereby improving the light focusing quality in the paraxial and off-axis regions. Furthermore, the following conditions can also be satisfied: 0.00 < |R9 / R2| < 0.50. Additionally, the following conditions can also be satisfied: 0.00 < |R9 / R2| < 0.40. Furthermore, the following condition can also be satisfied: 0.002 ≤ |R9 / R2| ≤ 0.34.

[0026] If half of the maximum field of view (HFOV) of the imaging lens system is the maximum focal length (45 degrees < HFOV < 55 degrees), the following condition can be met: 45 degrees < HFOV < 55 degrees. Therefore, it is advantageous to have a suitable imaging lens system field of view to meet the viewing angle requirements of the application device. Furthermore, the following condition can also be met: 47 degrees < HFOV < 53 degrees.

[0027] If the axial distance between the object-side surface of the first lens element and the image surface is TL, and the maximum image height of the imaging lens system (which can be half the diagonal length of an effective light-sensitive area of ​​the image sensor) is ImgH, the following condition can be met: 1.10 < TL / lmgH < 1.60. Therefore, it is advantageous to control the ratio of the total path length of the imaging lens system to the image height within a suitable range so that sufficient image brightness can be maintained while simultaneously meeting the miniaturization requirements of the imaging lens system. Furthermore, the following condition can also be met: 1.20 < TL / lmgH < 1.50.

[0028] If the focal length of the fifth lens element is f5 and the focal length of the sixth lens element is f6, the following condition can be met: 0.20 < |f5 / f6| < 0.90. Therefore, it is advantageous to match the refractive power of the fifth and sixth lens elements to correct aberrations. Furthermore, the following condition can also be met: 0.40 < |f5 / f6| < 0.80.

[0029] If the radius of curvature of the object-side surface of the first lens element is R1 and the radius of curvature of the object-side surface of the third lens element is R5, the following condition can be satisfied: 0.00 < |R5 / R1| < 0.60. Therefore, it is advantageous for controlling the direction of light propagation at the object end of the imaging lens system, thereby correcting coma and improving image quality. Furthermore, the following condition can also be satisfied: 0.00 < |R5 / R1| < 0.50.

[0030] If the axial distance between the first and second lens elements is T12, the axial distance between the second and third lens elements is T23, the axial distance between the third and fourth lens elements is T34, the axial distance between the fourth and fifth lens elements is T45, and the axial distance between the fifth and sixth lens elements is T56, then the following condition can be satisfied: 3.00 < (T12+T23) / (T34+T45+T56) < 7.50. Therefore, this is advantageous for balancing the spatial distribution of the lens elements. Furthermore, the following condition can also be satisfied: 4.00 < (T12+T23) / (T34+T45+T56) < 7.00.

[0031] If the focal length of the imaging lens system is f, the radius of curvature of the object-side surface of the fifth lens element is R9, and the radius of curvature of the image-side surface of the fifth lens element is R10, the following condition can be satisfied: 2.00 < |f / R9| + |f / R10| < 5.00. Therefore, it is advantageous to adjust the lens shape and refractive power of the fifth lens element to correct aberrations. Furthermore, the following condition can also be satisfied: 2.50 < |f / R9| + |f / R10| < 4.50.

[0032] If the Abbe number of the fourth lens element is V4, the following condition can be met: 35.0 < V4 < 65.0. Therefore, a suitable material section of the fourth lens element is advantageous for adjusting the light focusing capability of the fourth lens element. Furthermore, the following condition can also be met: 40.0 < V4 < 60.0.

[0033] If the focal length of the imaging lens system is f and the focal length of the fifth lens element is f5, the following condition can be met: 0.10 < f / f5 < 3.00.

[0034] Therefore, it is advantageous to provide sufficient light focusing capability at the image end of the imaging lens system. Furthermore, the following conditions can also be met: 0.50 < f / f5 < 2.80. Furthermore, the following conditions can also be met: 0.90 < f / f5 < 2.60. Furthermore, the following condition can also be met: 1.40 < f / f5 < 2.20.

[0035] If 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 lens system is f, the following condition can be satisfied: 1.45 < TL / f < 1.80. Therefore, it is advantageous to achieve a suitable balance between the total path length and the viewing angle of the imaging lens system. Furthermore, the following condition can also be satisfied: 1.50 < TL / f < 1.75.

[0036] If the focal length of the first lens element is f1 and the focal length of the fifth lens element is f5, the following condition can be met: 3.00 < |f1 / f5| < 5.50. Therefore, it is advantageous to adjust the ratio of the refractive powers of the first lens element to the fifth lens element to improve the light-focusing ability of the fifth lens element, thereby reducing the overall size and improving image quality. Furthermore, the following condition can also be met: 3.50 < |f1 / f5| < 5.00.

[0037] If the focal length of the imaging lens system is f, the focal length of the first lens element is f1, the focal length of the second lens element is f2, the focal length of the third lens element is f3, the focal length of the fourth lens element is f4, the focal length of the fifth lens element is f5, and the focal length of the sixth lens element is f6, then the following condition can be satisfied: 1.00 < |(f / f1+f / f2+f / f5) / (f / f3+f / f4+f / f6)| < 1.50. Therefore, it is advantageous to balance the refractive power distribution of the imaging lens system to correct aberrations. Furthermore, the following condition can also be satisfied: 1.10 < |(f / f1+f / f2+f / f5) / (f / f3+f / f4+f / f6)| < 1.40.

[0038] If the focal length of the imaging lens system is f, the radius of curvature of the object-side surface of the third lens element is R5, and the radius of curvature of the image-side surface of the third lens element is R6, the following condition can be satisfied: 2.00 < |f / R5| + |f / R6| < 4.00. Therefore, it is advantageous to match the lens shape to the refractive power of the third lens element in order to increase the image area. Furthermore, the following condition can also be satisfied: 2.50 < |f / R5| + |f / R6| < 3.50.

[0039] If the axial distance between the first and second lens elements is T12, and the axial distance between the second and third lens elements is T23, the following condition can be met: 0.60 < T12 / T23 < 1.20. Therefore, it is advantageous to adjust the ratio of the lens distance between the first and second lens elements to the lens distance between the second and third lens elements, thereby adjusting the viewing angle of the imaging lens system and improving the light focusing quality. Furthermore, the following condition can also be met: 0.70 < T12 / T23 < 1.10.

[0040] If the axial distance between the third and fourth lens elements is T34, and the distance parallel to the optical axis between a position of the maximum effective radius of the image-side surface of the third lens element and a position of the maximum effective radius of the object-side surface of the fourth lens element is ET34, then the following condition can be met: 0.00 < T34 / ET34 < 0.10. Therefore, this is advantageous for improving the light focusing quality at the edge. See [reference]. Fig. 24, which shows a schematic view of ET34 according to the 1st embodiment of the present disclosure.

[0041] If the central thickness of the first lens element is CT1 and the central thickness of the second lens element is CT2, the following condition can be met: 0.20 < CT1 / CT2 < 1.20. Therefore, it is advantageous to adjust the ratio of the central thicknesses of the first lens element to the second lens element, thereby reducing the sensitivity of the imaging lens system. Furthermore, the following conditions can also be met: 0.30 < CT1 / CT2 < 1.00. Additionally, the following condition can also be met: 0.40 < CT1 / CT2 < 0.80.

[0042] If the radius of curvature of the object-side surface of the first lens element is R1 and the radius of curvature of the object-side surface of the sixth lens element is R11, the following condition can be met: 0.00 < |R11 / R1| < 0.50. Therefore, this is advantageous for correcting aberrations and improving light focusing quality. Furthermore, the following condition can also be met: 0.00 < |R11 / R1| < 0.40.

[0043] If the focal length of the third lens element is f3 and the focal length of the sixth lens element is f6, the following condition can be met: 0.60 < |f3 / f6| < 1.60. Therefore, it is advantageous to adjust the ratio of the refractive powers of the third lens element to the sixth lens element to balance the refractive power distribution in the middle and at the image end of the imaging lens system and improve image quality. Furthermore, the following condition can also be met: 0.70 < |f3 / f6| < 1.50. Additionally, the following condition can also be met: 0.80 < |f3 / f6| < 1.40.

[0044] According to the present disclosure, the imaging lens system may further comprise an aperture diaphragm. If the combined focal length of the second lens element, the third lens element, the fourth lens element, the fifth lens element, and the sixth lens element is f23456, and the axial distance between the aperture diaphragm and the image surface SL is SL, the following condition can be satisfied: 0.80 < f23456 / SL < 1.20. Therefore, it is advantageous for adjusting the viewing angle of the imaging lens system.

[0045] If the central thickness of the first lens element is CT1 and the axial distance between the first and second lens elements is T12, the following condition can be met: 0.50 < CT1 / T12 < 1.40. Therefore, it is advantageous to adjust the ratio of the central thickness of the first lens element to the distance between the first and second lens elements, thereby setting the viewing angle. Furthermore, the following condition can also be met: 0.70 < CT1 / T12 < 1.30.

[0046] If the maximum effective radius of the object-side surface of the first lens element is Y1R1 and the maximum effective radius of the image-side surface of the sixth lens element is Y6R2, the following condition can be satisfied: 3.00 < Y6R2 / Y1R1 < 4.50. Therefore, it is advantageous to adjust the ratio of the effective radii of the image-side surface of the sixth lens element to the object-side surface of the first lens element, thereby increasing the image area while simultaneously decreasing the aperture. Furthermore, the following condition can also be satisfied: 3.50 < Y6R2 / Y1R1 < 4.20. See [reference]. Fig. 24, which shows a schematic view of Y1R1 and Y6R2 according to the 1st embodiment of the present disclosure.

[0047] According to the present disclosure, the above-mentioned features and conditions can be used in numerous combinations to achieve corresponding effects.

[0048] According to the present disclosure, the lens elements of the imaging lens system can be made of either glass or plastic material. If the lens elements are made of glass, the refractive power distribution of the imaging lens system can be more flexible, and the influence on the imaging caused by changes in ambient temperature can be reduced. The glass lens element can be manufactured either by grinding or forming. If the lens elements are made of plastic material, the manufacturing costs can be effectively reduced. Furthermore, the surfaces of each lens element can 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, thereby effectively shortening the overall path length of the imaging lens system. Additionally, the aspherical surfaces can be manufactured by plastic injection molding or glass forming.

[0049] According to the present disclosure, if a lens surface is aspherical, it means that the lens surface has an aspherical shape over its entire optically effective area or part(s) thereof.

[0050] According to the present disclosure, the material of one or more lens elements can optionally contain an additive that produces light absorption and interference effects and modifies the transmittance of the lens elements in a specific wavelength range to reduce unwanted scattered light or color deviations. For example, the additive can 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 can 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 can be homogeneously mixed with a plastic material to be used for the production of a plastic lens element from the mixed material by injection molding.Furthermore, the additive can be applied to the lens surfaces to achieve the effects mentioned above.

[0051] According to the present disclosure, both an object-side surface and an image-side surface have a paraxial region and an off-axis region. The paraxial region refers to the region of the surface where light rays travel close to the optical axis, and the off-axis region refers to the region of the surface that is farther from the paraxial region. In particular, unless otherwise specified, if the lens element has a convex surface, the surface in the paraxial region is convex, and if the lens element has a concave surface, the surface in the paraxial region is concave. If a portion of the refractive power, radius of curvature, or focal point of a lens element is not defined, this means that the portion of the refractive power, radius of curvature, or focal point of the lens element lies within its paraxial region.

[0052] 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 a non-axial point on the lens surface where its tangent is perpendicular to the optical axis. See Fig.23, which shows a schematic view of critical points C on the image-side surface of the first lens element E1, the object-side surface of the second lens element E2, the object-side surface of the fourth lens element E4, the object-side surface of the fifth lens element E5, the image-side surfaces of the fifth lens element E5, the object-side surface of the sixth lens element E6 and the image-side surface of the sixth lens element E6 according to the 1st embodiment of the present disclosure.The above-mentioned critical points C on the image-side surface of the first lens element E1, the object-side surface of the second lens element E2, the object-side surface of the fourth lens element E4, the object-side surface of the fifth lens element E5, the image-side surface of the fifth lens element E5, the object-side surface of the sixth lens element E6 and the image-side surface of the sixth lens element E6 in . Fig. Figures 23 are examples. Each of the lens surfaces in different embodiments of the present disclosure may also have one or more critical points in an off-axis region thereof.

[0053] According to the present disclosure, the image surface of the imaging lens system, based on the corresponding image sensor, can be flat or curved, in particular a curved surface that is concave and oriented towards the object side of the imaging lens system.

[0054] According to the present disclosure, an image correction unit, such as an image field flattener, can optionally be arranged between the lens element that is closest along the beam path to the image side of the imaging lens system and the image surface to correct aberrations such as image 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 adapted 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 planar image-side surface, wherein the thin transparent element is arranged near the image surface.

[0055] According to the present disclosure, at least one light deflecting element, such as a prism or a mirror, which may have a planar, spherical, aspherical, or free-form surface, can optionally be arranged between an imaged object and an image surface on the imaging beam path, so that the imaging lens system can be more flexible in its spatial arrangement and therefore the dimensions of an electronic device are not limited by the total path length of the imaging lens system. See in particular Fig. 25 and Fig. 26. Fig. Figure 25 shows a schematic view of a configuration of a light deflection element in an imaging lens system according to an embodiment of the present disclosure, and Fig.Figure 26 shows a schematic view of a further configuration of a light deflection element in an imaging lens system according to an embodiment of the present disclosure. Fig. 25 and Fig. 26. The imaging lens system can have, in the sequence from an imaged object (not shown in the figures) to an image surface IMG along a beam path, a first optical axis OA1, a light deflection element LF, and a second optical axis OA2. The light deflection element LF can be arranged between the imaged object and a lens group LG of the imaging lens system, as shown in Fig. 25 shown, or arranged between a lens group LG of the imaging lens system and the image surface IMG, as shown in Fig. 26 shown. See also Fig.27, which shows a schematic view of a configuration of two light deflection elements in an imaging lens system according to an embodiment of the present disclosure. Fig.27. The imaging lens system can have, in the sequence from an imaged object (not shown in the figure) to an image surface IMG along a beam path, a first optical axis OA1, a first light deflection element LF1, a second optical axis OA2, a second light deflection element LF2, and a third optical axis OA3. The first light deflection element LF1 is arranged between the imaged object and a lens group LG of the imaging lens system, the second light deflection element LF2 is arranged between the lens group LG of the imaging lens system and the image surface IMG, and the direction of propagation of the light on the first optical axis OA1 can be the same direction as the direction of propagation of the light on the third optical axis OA3, as shown in Fig.27 shown. The imaging lens system can optionally be provided with three or more light deflection elements, and the present disclosure is not limited to the type, number and position of the light deflection elements of the embodiments disclosed in the aforementioned figures.

[0056] According to the present disclosure, the imaging lens system can comprise at least one aperture, for example an aperture diaphragm, a glare diaphragm, or a field diaphragm. The glare diaphragm or field diaphragm serves to eliminate stray light and thereby improve the image quality.

[0057] According to the present disclosure, an aperture diaphragm can be configured as a front diaphragm or a central diaphragm. A front diaphragm, arranged between an imaged object and the first lens element, can create a greater distance between the exit pupil of the imaging lens system and the image surface to produce a telecentric effect, thereby improving the image acquisition efficiency of an image sensor (e.g., CCD or CMOS). A central diaphragm, arranged between the first lens element and the image surface, is advantageous for increasing the viewing angle of the imaging lens system and thereby creating a wider field of view for the same imaging lens.

[0058] According to the present disclosure, the imaging lens system can include an aperture control unit. The aperture control unit can be a mechanical component or a light modulator that can control the size and shape of the aperture by means of electricity or electrical signals. The mechanical component can include a movable element, such as an aperture assembly or a light-shielding film. The light modulator can 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 can be the aperture diaphragm of the present disclosure, which changes the f-number to achieve various image effects, such as depth of field or lens speed.

[0059] According to the present disclosure, the imaging lens system can comprise one or more optical lens elements for limiting the shape of the light passing through the imaging lens system. Each optical element can be, but is not limited to, a filter, a polarizer, etc., and each optical element can be, but is not limited to, a single element, a composite component, a thin film, etc. The optical element can be arranged on the object side or the image side of the optical lens system or between two adjacent lens elements to transmit light in a specific shape and thus meet the application requirements.

[0060] According to the present disclosure, the optical lens system for imaging can comprise at least one optical lens element, an optical element, or a support having at least one surface with a weakly reflective layer. The weakly reflective layer can effectively reduce scattered light resulting from light reflection at the interface. The weakly reflective layer can be located in an optically ineffective region of an object-side surface, an image-side surface of the optical lens element, or an interface between the object-side and image-side surfaces. The optical element can be a light-blocking element, an annular spacer, a tube element, a cover glass, a blue glass, a filter, a color filter, a beam deflection element, a prism, a mirror, etc.The carrier can be a base for holding a lens assembly, a microlens mounted on an image sensor, a substrate surrounding the image sensor, a glass plate to protect the image sensor, etc.

[0061] According to the present disclosure, the imaging lens system can further comprise a light-blocking element. The light-blocking element can have a non-circular aperture, and the non-circular aperture can have different effective radii in different directions perpendicular to the optical axis. Therefore, it is advantageous to adapt it to the shape of non-circular lens elements or aperture diaphragms in order to save space and to fully utilize the light passing through the non-circular lens elements or aperture diaphragms, thereby reducing stray light. In addition, the light-blocking element can be provided with a wavy or serrated structure at the edge of an inner hole therein.

[0062] 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 are calculated along the optical axis. If the optical axis is deflected by a light deflection element, the axial optical data are also calculated along the deflected optical axis.

[0063] According to the above description of the present disclosure, the following specific embodiments are also provided. 1. Design

[0064] Fig. Figure 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.The image acquisition unit comprises the imaging lens system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The imaging lens system comprises, in order from an object side to an image side along an optical axis, an aperture S1, a first lens element E1, an aperture diaphragm ST, a second lens element E2, an aperture S2, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a filter E7, and an image surface IMG. The imaging lens system comprises six lens elements (E1, E2, E3, E4, E5, and E6), with no additional lens element arranged between any of the adjacent six lens elements.

[0065] The first lens element E1, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The first lens element E1 is made of plastic material and both its object-side and image-side surfaces 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. The image-side surface of the first lens element E1 has a critical point in an off-axis region.

[0066] The second lens element E2, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces 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.

[0067] The third lens element E3, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces 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.

[0068] The fourth lens element E4, with positive refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The fourth lens element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fourth lens element E4 has two inflection points. The image-side surface of the fourth lens element E4 has six inflection points. The object-side surface of the fourth lens element E4 has two critical points in an off-axis region.

[0069] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has three inflection points. The image-side surface of the fifth lens element E5 has four inflection points. The object-side surface of the fifth lens element E5 has one critical point in an off-axis region. The image-side surface of the fifth lens element E5 has two critical points in an off-axis region.

[0070] The sixth lens element E6, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The sixth lens element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth lens element E6 has three inflection points. The image-side surface of the sixth lens element E6 has three inflection points. The object-side surface of the sixth lens element E6 has a critical point in an off-axis region. The image-side surface of the sixth lens element E6 has a critical point in an off-axis region.

[0071] The E7 filter is made of glass and is located between the sixth lens element E6 and the image surface IMG. It does not affect the focal length of the imaging lens system. The IS image sensor is located on or near the image surface IMG of the imaging lens system.

[0072] The equation for the aspherical surface profiles of the above-mentioned lens elements of the first embodiment is as follows: X(Y)=(Y2 / R) / (1+sqrt(1−(1+k)×(Y / R)2))+∑i(Ai)×(Yi) , where X is the displacement parallel to the 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 conic coefficient; and Ai is the i-th aspherical coefficient, where in the embodiments i can be 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28 and 30, but is not limited to these.

[0073] In the imaging lens system of the image acquisition unit 1 according to the 1st embodiment, where f is the focal length of the imaging lens system, Fno is the f-number of the imaging lens system, HFOV is half of the maximum field of view of the imaging lens system, and FOV is the maximum field of view of the imaging lens system, these parameters have the following values: f = 2.64 millimeters (mm), Fno = 2.45, HFOV = 49.8 degrees, and FOV = 99.6 degrees.

[0074] If the axial distance between the object-side surface of the first lens element E1 and the image surface IMG is TL and the maximum image height of the imaging lens system is ImgH, then the following condition is met: TL / lImgH = 1.36.

[0075] If the axial distance between the object-side surface of the first lens element E1 and the image surface IMG TL is and the focal length of the imaging lens system is f, then the following condition is met: TL / f = 1.61.

[0076] If the focal length of the imaging lens system is f and the focal length of the fifth lens element E5 is f5, then the following condition is met: f / f5 = 1.63.

[0077] If the focal length of the imaging lens system is f, 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 third lens element E3 is f3, a focal length of the fourth lens element E4 is f4, the focal length of the fifth lens element E5 is f5, and a focal length of the sixth lens element E6 is f6, then the following condition is satisfied: |(f / f1+f / f2+f / f5) / (f / f3+f / f4+f / f6)|=1.26.

[0078] If the focal length of the first lens element E1 is f1 and the focal length of the fifth lens element E5 is f5, then the following condition is met: |f1 / f5| = 3.75.

[0079] If the focal length of the third lens element E3 is f3 and the focal length of the sixth lens element E6 is f6, then the following condition is satisfied: |f3 / f6| = 1.17.

[0080] If the focal length of the fifth lens element E5 is f5 and the focal length of the sixth lens element E6 is f6, then the following condition is satisfied: |f5 / f6| = 0.71.

[0081] If the combined focal length of the second lens element E2, the third lens element E3, the fourth lens element E4, the fifth lens element E5 and the sixth lens element E6 is f23456 and the axial distance between the aperture diaphragm ST and the image surface is IMG SL, the following condition is met: f23456 / SL=1.03.

[0082] If the focal length of the imaging lens system is f, a radius of curvature of the object-side surface of the third lens element E3 is R5, and a radius of curvature of the image-side surface of the third lens element E3 is R6, then the following condition is satisfied: |f / R5|+|f / R6| = 2.72.

[0083] If the focal length of the imaging lens system is f, a radius of curvature of the object-side surface of the fifth lens element E5 R9 is and a radius of curvature of the image-side surface of the fifth lens element E5 R10 is, the following condition is satisfied: |f / R9|+|f / R10| = 3.10.

[0084] If the axial distance between the object-side surface of the first lens element E1 and the image surface IMG TL is and a radius of curvature of the image-side surface of the fourth lens element E4 is R8, the following condition is met: |TL / R8|=0.88.

[0085] If the radius of curvature of the object-side surface of the first lens element E1 is R1 and the radius of curvature of the object-side surface of the third lens element E3 is R5, then the following condition is satisfied: |R5 / R1| = 0.38.

[0086] If the radius of curvature of the image-side surface of the third lens element E3 is R6 and the radius of curvature of the object-side surface of the fourth lens element E4 is R7, then the following condition is satisfied: |R6 / R7| = 0.88.

[0087] If the radius of curvature of the image-side surface of the first lens element E1 is R2 and the radius of curvature of the object-side surface of the fifth lens element E5 is R9, then the following condition is satisfied: |R9 / R2| = 0.003.

[0088] If the radius of curvature of the object-side surface of the first lens element E1 is R1 and the radius of curvature of the object-side surface of the sixth lens element E6 is R11, then the following condition is satisfied: |R11 / R1| = 0.31.

[0089] If the central thickness of the first lens element E1 is CT1 and the axial distance between the first lens element E1 and the second lens element E2 is T12, the following condition is satisfied: CT1 / T12 = 0.86. 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.

[0090] If the central thickness of the first lens element E1 is CT1 and the central thickness of the second lens element E2 is CT2, then the following condition is met: CT1 / CT2=0.52. If the axial distance between the first lens element E1 and the second lens element E2 is T12, the axial distance between the second lens element E2 and the third lens element E3 is T23, the axial distance between the third lens element E3 and the fourth lens element E4 is T34, the axial distance between the fourth lens element E4 and the fifth lens element E5 is T45, and the axial distance between the fifth lens element E5 and the sixth lens element E6 is T56, then the following condition is satisfied: (T12+T23) / (T34+T45+T56) = 6.79.

[0091] If the axial distance between the first lens element E1 and the second lens element E2 is T12 and the axial distance between the second lens element E2 and the third lens element E3 is T23, then the following condition is met: T12 / T23 = 0.87.

[0092] If the Abbe number of the fourth lens element E4 is V4, then the following condition is satisfied: V4 = 44.6.

[0093] If the axial distance between the third lens element E3 and the fourth lens element E4 is T34 and a distance parallel to the optical axis between a position of the maximum effective radius of the image-side surface of the third lens element E3 and a position of the maximum effective radius of the object-side surface of the fourth lens element E4 is ET34, the following condition is satisfied: T34 / ET34=0.06.

[0094] If the maximum effective radius of the object-side surface of the first lens element is E1 Y1R1 and the maximum effective radius of the image-side surface of the sixth lens element is E6 Y6R2, then the following condition is satisfied: Y6R2 / Y1R1=3.96.

[0095] The detailed optical data of the first embodiment are listed in Table 1A and the aspherical surface data are listed in Table 1B below. TABLE 1A 1. Design f = 2.64 mm, Fno = 2.45, HFOV = 49.8 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture Plano -0,008 2 Lens 1 3,2778 (ASP) 0,274 plastic 1,544 56,0 6,06 3 510,1674 (ASP) 0,012 4 Ape.-Blender Plano 0,308 5 Lens 2 89,4301 (ASP) 0,531 plastic 1,545 56,1 4,56 6 -2,5520 (ASP) -0,272 7 Aperture Plano 0,638 8 Lens 3 -1,2388 (ASP) 0,263 plastic 1,656 21,3 -2,69 9 -4,5233 (ASP) 0,030 10 Lens 4 -5,1618 (ASP) 0,394 plastic 1,562 44,6 88,38 11 -4,8041 (ASP) 0,030 12 Lens 5 1,6265 (ASP) 0,421 plastic 1,551 44,8 1,62 13 -1,7850 (ASP) 0,041 14 Lens 6 1,0309 (ASP) 0,331 plastic 1,566 37,4 -2.29 15 0,5072 (ASP) 0,686 16 filter Plano 0,210 Glass 1,517 64,2 - 17 Plano 0,352 18 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 1) is 0.655 mm. The effective radius of aperture S2 (surface 7) is 0.881 mm. TABLE 1B Aspheric coefficients Surface # 2 3 5 6 k = 0,00000E+00 0,00000E+00 0,00000E+00 1,85567E+00 A4 = -1,343150093E-01 -1,428244242E-01 -2,624660481 E-01 -2,456923331 E-01 A6 = 8,214164208E-01 -8,313581525E-01 5,533807415E+00 -1,447017497E+00 A8 = -1,418253724E+01 1,708198184E+01 -1,864239362E+02 3,776000575E+01 A10 = 1,182956888E+02 -2,401564009E+02 3,614534576E+03 -4,888801924E+02 A12 = -5,980066943E+02 2,045479697E+03 -4,472589043E+04 3,917048938E+03 A14 = 1,884265331E+03 -1,067176352E+04 3,737980359E+05 -2,113492838E+04 A16 = -3,650895984E+03 3,323873445E+04 -2,186608243E+06 7,998606050E+04 A18 = 4,006498855E+03 -5,664209807E+04 9,128120819E+06 -2,168037800E+05 A20 = -1,916074839E+03 4,058583155E+04 -2,735914053E+07 4,235759557E+05 A22 = - - 5,844947139E+07 -5,920095827E+05 A24 = - - -8,689336546E+07 5,774580597E+05 A26 = - - 8,544446582E+07 -3,732696193E+05 A28 = - - -4,997212912E+07 1,435914733E+05 A30 = - - 1,316533255E+07 -2,485869104E+04 Surface # 8 9 10 11 k = -6,38939E-01 1,14004E+00 0,00000E+00 0,00000E+00 A4 = -1,692777814E+00 -1,520307301E+00 7,911561459E-01 9,437455449E-01 A6 = 9,523513019E+00 9,597527270E+00 -1,849763099E+00 -6,485088415E+00 A8 = -4,949160178E+01 -4,837128039E+01 2,565100463E+00 2,381436872E+01 A10 = 1,936767551E+02 1,784451279E+02 1,314292764E+00 -5,479362935E+01 A12 = -3,863505312E+02 -4,703475202E+02 -1,656452586E+01 8,673107247E+01 A14 = -5,094354275E+02 8,758543552E+02 4,256194252E+01 -9,926923957E+01 A16 = 6,143725369E+03 -1,131663587E+03 -6,446684649E+01 8,418829972E+01 A18 = -2,098417918E+04 9,692972941E+02 6,583836988E+01 -5,332111749E+01 A20 = 4,261926770E+04 -4,761331030E+02 -4,719748067E+01 2,510249370E+01 A22 = -5,715748643E+04 3,799972266E+01 2,389022633E+01 -8,639531556E+00 A24 = 5,134253196E+04 1,142014218E+02 -8,382329690E+00 2,106028147E+00 A26 = -2,986942767E+04 -7,723917347E+01 1,942340909E+00 -3,435538395E-01 A28 = 1,021004163E+04 2,221446481E+01 -2,675073659E-01 3,356940869E-02 A30 = -1,560836989E+03 -2,527968001E+00 1,658819169E-02 -1,482877529E-03 Surface # 12 13 14 15 k = -4,38277E+00 -2,02845E+00 -3,60066E+00 -2,85057E+00 A4 = 4,182343426E-01 1,283179530E+00 2,608249329E-01 -2,124763835E-01 A6 = -1,807316109E+00 -1,087149048E+00 -1,624680294E+00 2,272140410E-01 A8 = 5,530843329E+00 -1,227981813E+00 4,167033133E+00 -1,632936042E-01 A10 = -1,151608352E+01 4,398355936E+00 -6,921263147E+00 -1,019455842E-01 A12 = 1,637720844E+01 -5,980877918E+00 7,383550522E+00 2,935288437E-01 A14 = -1,646209516E+01 4,992693673E+00 -5,233427323E+00 -2,561884854E-01 A16 = 1,195816170E+01 -2,820162588E+00 2,560434184E+00 1,287546750E-01 A18 = -6,353628473E+00 1,118812909E+00 -8,866430576E-01 -4,243142679E-02 A20 = 2,474176750E+00 -3,159775355E-01 2,195736175E-01 9,606435856E-03 A22 = -6,988118442E-01 6,331169528E-02 -3,870755469E-02 -1,511401321E-03 A24 = 1,393050739E-01 -8,805614098E-03 4,749014425E-03 1,629014678E-04 A26 = -1,856703174E-02 8,091102008E-04 -3,857306911E-04 -1,149381976E-05 A28 = 1,482937691E-03 -4,419952893E-05 1,865578597E-05 4,787832023E-07 A30 = -5,359831356E-05 1,087673631E-06 -4,069141621E-07 -8,932534157E-09

[0096] Table 1A lists the radius of curvature, thickness, and focal length in millimeters (mm). Surface numbers 0–18 represent the surfaces arranged along the optical axis from the object side to the image side. In Table 1B, k represents the conic coefficient of the aspherical surface profile equation. A4–A30 represent the aspherical coefficients of the 4th to 30th order. The tables shown below for each embodiment are the corresponding schematic parameter and aberration curves, and the definitions in the tables are the same as those in Table 1A and Table 1B for the first embodiment. Therefore, no further explanation is given in this regard. 2. Design

[0097] Fig. Figure 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 comprises the image acquisition unit 2, the imaging lens system (whose reference numeral is omitted) of the present disclosure, and an image sensor IS. The imaging lens system comprises, in order from an object side to an image side along an optical axis, an aperture S1, a first lens element E1, an aperture diaphragm ST, a second lens element E2, an aperture S2, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a filter E7, and an image surface IMG. The imaging lens system comprises six lens elements (E1, E2, E3, E4, E5, and E6), with no additional lens element arranged between any of the adjacent six lens elements.

[0098] The first lens element E1 with positive refractive power has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The first lens element E1 is made of plastic material and both the object-side and image-side surfaces are aspherical.

[0099] The second lens element E2, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the second lens element E2 has an inflection point. The image-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.

[0100] The third lens element E3, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the third lens element E3 has one inflection point. The image-side surface of the third lens element E3 has two inflection points.

[0101] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is also concave in a paraxial region. The fourth lens element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fourth lens element E4 has two inflection points. The image-side surface of the fourth lens element E4 has five inflection points. The object-side surface of the fourth lens element E4 has two critical points in an off-axis region.

[0102] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has three inflection points. The image-side surface of the fifth lens element E5 has four inflection points. The object-side surface of the fifth lens element E5 has one critical point in an off-axis region. The image-side surface of the fifth lens element E5 has two critical points in an off-axis region.

[0103] The sixth lens element E6, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The sixth lens element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth lens element E6 has four inflection points. The image-side surface of the sixth lens element E6 has two inflection points. The object-side surface of the sixth lens element E6 has one critical point in an off-axis region. The image-side surface of the sixth lens element E6 has one critical point in an off-axis region.

[0104] The E7 filter is made of glass and is located between the sixth lens element E6 and the image surface IMG. It does not affect the focal length of the imaging lens system. The IS image sensor is located on or near the image surface IMG of the imaging lens system.

[0105] The detailed optical data of the 2nd embodiment are listed in Table 2A and the aspherical surface data are listed in Table 2B below. TABLE 2A 2. Design f = 2.55 mm, Fno = 2.45, HFOV = 51.4 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture Plano 0,070 2 Lens 1 -88,4956 (ASP) 0,308 plastic 1,544 56,0 7,47 3 -3,8880 (ASP) -0,032 4 Ape.-Blender Plano 0,300 5 Lens 2 12,8923 (ASP) 0,615 plastic 1,544 56,0 3,90 6 -2,5000 (ASP) -0,344 7 Aperture Plano 0,710 8 Lens 3 -1,1748 (ASP) 0,279 plastic 1,669 19,5 -2,95 9 -3,1759 (ASP) 0,046 10 Lens 4 -4,0886 (ASP) 0,268 plastic 1,559 40,4 -6,75 11 49,9807 (ASP) 0,043 12 Lens 5 1,3363 (ASP) 0,437 plastic 1,544 56,0 1,54 13 -1,9808 (ASP) 0,065 14 Lens 6 0,8441 (ASP) 0,300 plastic 1,562 44,6 -3,29 15 0,5055 (ASP) 0,686 16 filter Plano 0,210 Glass 1,517 64,2 - 17 Plano 0,408 18 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 1) is 0.698 mm. An effective radius of aperture S2 (surface 7) is 0.921 mm. TABLE 2B Aspheric coefficients Surface # 2 3 5 6 k = 0,00000E+00 0,00000E+00 0,00000E+00 2,12787E+00 A4 = -1,323029695E-01 -2,220320062E-01 -2,110547954E-01 -2,455513684E-01 A6 = -1,255583161E+00 -3,673869840E-01 1,922041390E+00 -9,777295736E-01 A8 = 1,869602564E+01 1,378660136E+01 -5,767398826E+01 1,780037448E+01 A10 = -1,688882874E+02 -2,185448454E+02 1,024850325E+03 -1,722928212E+02 A12 = 9,292051734E+02 1,935577353E+03 -1,203001530E+04 1,051254433E+03 A14 = -3,157326995E+03 -1,015814077E+04 9,763532497E+04 -4,317099956E+03 A16 = 6,458153635E+03 3,135956404E+04 -5,632065881E+05 1,206596212E+04 A18 = -7,282930090E+03 -5,262087465E+04 2,341460553E+06 -2,221364046E+04 A20 = 3,476558558E+03 3,702910959E+04 -7,033521292E+06 2,363426553E+04 A22 = - - 1,512156637E+07 -5,363520343E+03 A24 = - - -2,268412498E+07 -2,237882378E+04 A26 = - - 2,255056271E+07 3,295643093E+04 A28 = - - -1,335328391E+07 -2,012052397E+04 A30 = - - 3,566954131E+06 4,845782874E+03 Surface # 8 9 10 11 k = -6,08794E-01 2,09418E-01 0,00000E+00 0,00000E+00 A4 = -1,510229068E+00 -1,275892283E+00 5,970437403E-01 5,985880177E-01 A6 = 8,795692725E+00 6,074537346E+00 1,242011261E-01 -4,180512318E+00 A8 = -7,050917577E+01 -1,886187354E+01 -5,415960580E+00 1,388621744E+01 A10 = 5,279263180E+02 1,937525291E+01 2,131824598E+01 -2,683665729E+01 A12 = -2,880763436E+03 1,242811196E+02 -4,997353195E+01 3,344898765E+01 A14 = 1,105945357E+04 -7,428668577E+02 7,914491358E+01 -2,859452198E+01 A16 = -3,023770992E+04 2,143023040E+03 -8,809150094E+01 1,743719997E+01 A18 = 5,973661844E+04 -3,964466428E+03 7,015800065E+01 -7,777394571E+00 A20 = -8,573513176E+04 5,015281108E+03 -4,014832743E+01 2,574321488E+00 A22 = 8,868292996E+04 -4,400998482E+03 1,634717407E+01 -6,346610020E-01 A24 = -6,442116111E+04 2,642539519E+03 -4,607094718E+00 1,149971276E-01 A26 = 3,114187281 E+04 -1,037910086E+03 8,499981030E-01 -1,464395819E-02 A28 = -8,972481567E+03 2,405951390E+02 -9,164615722E-02 1,175673594E-03 A30 = 1,161531522E+03 -2,497957794E+01 4,323411818E-03 -4,460323158E-05 Surface # 12 13 14 15 k = -4,03689E+00 -2,01921E+00 -4,10547E+00 -2,70017E+00 A4 = 5,155844879E-01 1,318673932E+00 2,795327131E-01 -2,577457324E-01 A6 = -1,930399115E+00 -1,199664652E+00 -1,602421509E+00 3,573300701E-01 A8 = 5,278503816E+00 -1,249633399E+00 3,786589838E+00 -4,628430560E-01 A10 = -1,064340380E+01 4,788545031E+00 -5,908025040E+00 3,334666369E-01 A12 = 1,529361454E+01 -6,626217794E+00 6,006005473E+00 -9,274600998E-02 A14 = -1,558394976E+01 5,569142572E+00 -4,072459103E+00 -3,404999448E-02 A16 = 1,117453038E+01 -3,157262145E+00 1,904473793E+00 4,180247715E-02 A18 = -5,533151699E+00 1,257768186E+00 -6,288313693E-01 -1,858150312E-02 A20 = 1,797072606E+00 -3,576420140E-01 1,480626174E-01 4,964612239E-03 A22 = -3,254686839E-01 7,243238810E-02 -2,474696180E-02 -8,721127997E-04 A24 = 6,521549925E-03 -1,023107072E-02 2,871247806E-03 1,018693372E-04 A26 = 1,080485363E-02 9,596916446E-04 -2,200359370E-04 -7,644110973E-06 A28 = -2,201003290E-03 -5,380458416E-05 1,002045126E-05 3,341810764E-07 A30 = 1,468632273E-04 1,365959639E-06 -2,054347736E-07 -6,477819136E-09

[0106] In the second embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the first embodiment. The definitions of the parameters listed in Table 2C are also the same as those given in the first embodiment, with corresponding values ​​for the second embodiment, so no further explanation is required.

[0107] Furthermore, these parameters from Table 2A and Table 2B can be calculated as the following values ​​and must meet the following conditions: TABLE 2C Schematic parameters f [mm] 2,55 |f / R9|+|f / R10| 3,20 Fno 2,45 |TL / R8| 0,09 HFOV [Grade] 51,4 |R5 / R1| 0,01 FOV [degrees] 102,8 |R6 / R7| 0,78 TL / lmgH 1,37 |R9 / R2| 0,34 TL / f 1,68 |R11 / R1| 0,01 f / f5 1,66 CT1 / T12 1,15 |(f / f1+f / f2+f / f5) / ( / f3+f / f4+f / f6)| 1,32 CT1 / CT2 0,50 |f1 / f5| 4,85 (T12+T23) / (T34+T45+T56) 4,12 |f3 / f6| 0,90 T12 / T23 0,73 |f5 / f6| 0,47 V4 40,4 f23456 / SL 0,88 T34 / ET34 0,07 |f / R5|+|f / R6| 2,98 Y6R2 / Y1 R1 3,67 3. Design

[0108] Fig. Figure 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 comprises the image acquisition unit 3, the imaging lens system (whose reference numeral is omitted) of the present disclosure, and an image sensor IS. The imaging lens system comprises, in order from an object side to an image side along an optical axis, an aperture S1, a first lens element E1, an aperture diaphragm ST, a second lens element E2, an aperture S2, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a filter E7, and an image surface IMG. The imaging lens system comprises six lens elements (E1, E2, E3, E4, E5, and E6), with no additional lens element arranged between any of the adjacent six lens elements.

[0109] The first lens element E1, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The first lens element E1 is made of plastic material and both its object-side and image-side surfaces 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. The image-side surface of the first lens element E1 has a critical point in an off-axis region.

[0110] The second lens element E2, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the second lens element E2 has an inflection point. The image-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.

[0111] The third lens element E3, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces 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.

[0112] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is also concave in a paraxial region. The fourth lens element E4 is made of plastic material and both its object-side and image-side surfaces are aspheric. The object-side surface of the fourth lens element E4 has two inflection points. The image-side surface of the fourth lens element E4 has three inflection points. The object-side surface of the fourth lens element E4 has two critical points in an off-axis region. The image-side surface of the fourth lens element E4 has one critical point in an off-axis region.

[0113] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has three inflection points. The image-side surface of the fifth lens element E5 has four inflection points. The object-side surface of the fifth lens element E5 has one critical point in an off-axis region. The image-side surface of the fifth lens element E5 has two critical points in an off-axis region.

[0114] The sixth lens element E6, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The sixth lens element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth lens element E6 has five inflection points. The image-side surface of the sixth lens element E6 has two inflection points. The object-side surface of the sixth lens element E6 has one critical point in an off-axis region. The image-side surface of the sixth lens element E6 has one critical point in an off-axis region.

[0115] The E7 filter is made of glass and is located between the sixth lens element E6 and the image surface IMG. It does not affect the focal length of the imaging lens system. The IS image sensor is located on or near the image surface IMG of the imaging lens system.

[0116] The detailed optical data of the 3rd embodiment are listed in Table 3A and the aspherical surface data are listed in Table 3B below. TABLE 3A 3. Design f = 2.75 mm, Fno = 2.45, HFOV = 49.2 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture Plano -0,012 2 Lens 1 3,0179 (ASP) 0,290 plastic 1,544 56,0 5,87 3 52,3295 (ASP) 0,011 4 Ape.-Blender Plano 0,311 5 Lens 2 63,2654 (ASP) 0,532 plastic 1,551 44,8 4,68 6 -2,6760 (ASP) -0,263 7 Aperture Plano 0,614 8 Lens 3 -1,2263 (ASP) 0,282 plastic 1,686 18,4 -3,05 9 -3,2448 (ASP) 0,034 10 Lens 4 -4,6228 (ASP) 0,305 plastic 1,545 56,1 -5,72 11 9,7733 (ASP) 0,030 12 Lens 5 1,2922 (ASP) 0,542 plastic 1,535 55,9 1.38 13 -1,4679 (ASP) 0,040 14 Lens 6 1,0726 (ASP) 0,336 plastic 1,535 55,9 -2.36 15 0,5167 (ASP) 0,686 16 filter Plano 0,210 Glass 1,517 64,2 - 17 Plano 0,383 18 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 1) is 0.679 mm. An effective radius of aperture S2 (surface 7) is 0.889 mm. TABLE 3B Aspheric coefficients Surface # 2 3 5 6 k = 0,00000E+00 0,00000E+00 0,00000E+00 1,32740E+00 A4 = -1,276196051E-01 -5,967078386E-02 -2,855431345E-01 -2,493982269E-01 A6 = 3,371452870E-01 -3,346545073E+00 4,386287906E+00 -9,966037977E-01 A8 = -2,918759880E+00 5,880773795E+01 -1,006455433E+02 2,356653881E+01 A10 = 3,240519181E-01 -6,450797536E+02 1,447394173E+03 -2,955399435E+02 A12 = 1,027411966E+02 4,418335321E+03 -1,394554580E+04 2,408202693E+03 A14 = -6,280214286E+02 -1,904307947E+04 9,219163148E+04 -1,360362305E+04 A16 = 1,747879148E+03 5,012616167E+04 -4,229145571E+05 5,455656748E+04 A18 = -2,413113280E+03 -7,354834620E+04 1,337445463E+06 -1,570495695E+05 A20 = 1,337749274E+03 4,607111767E+04 -2,817229999E+06 3,248637162E+05 A22 = - - 3,570558366E+06 -4,779358999E+05 A24 = - - -1,729766542E+06 4,871942328E+05 A26 = - - -1,802027465E+06 -3,265299243E+05 A28 = - - 3,104348875E+06 1,291745571E+05 A30 = - - -1,358382737E+06 -2,280280643E+04 Surface # 8 9 10 11 k = -6,10748E-01 -1,01354E+00 0,00000E+00 0,00000E+00 A4 = -1,378578289E+00 -1,275754269E+00 9,350814113E-01 8,596230912E-01 A6 = 3,374979665E+00 6,118368478E+00 -3,096490350E+00 -5,507292481E+00 A8 = 1,876545041E+01 -2,548699704E+01 8,512421625E+00 1,767175402E+01 A10 = -3,563658679E+02 7,752294182E+01 -1,580262189E+01 -3,516320981E+01 A12 = 2,935785749E+03 -1,302265259E+02 1,701414404E+01 4,773004801E+01 A14 = -1,543279059E+04 -2,386725996E+01 -5,296716358E+00 -4,656100284E+01 A16 = 5,554211242E+04 7,044252843E+02 -1,329632070E+01 3,362727490E+01 A18 = -1,408398007E+05 -1,854482298E+03 2,431573031E+01 -1,824499217E+01 A20 = 2,544360489E+05 2,732448068E+03 -2,172523032E+01 7,445209779E+00 A22 = -3,261780080E+05 -2,599211511E+03 1,228500125E+01 -2,255084504E+00 A24 = 2,902914212E+05 1,633770843E+03 -4,585647622E+00 4,915511052E-01 A26 = -1,706976767E+05 -6,583691932E+02 1,101416723E+00 -7,276212957E-02 A28 = 5,967415792E+04 1,545393515E+02 -1,548372623E-01 6,532055958E-03 A30 = -9,395942202E+03 -1,609451478E+01 9,704668328E-03 -2,677500384E-04 Surface # 12 13 14 15 k = -4,37017E+00 -2,10778E+00 -3,92195E+00 -2,90022E+00 A4 = 3,618022522E-01 1,298136508E+00 2,759174926E-01 -2,658480028E-01 A6 = -1,434909974E+00 -1,427593780E+00 -1,566835535E+00 4,136198896E-01 A8 = 3,732899578E+00 2,267561281E-01 3,686452345E+00 -5,975568594E-01 A10 = -6,409439702E+00 1,387248432E+00 -5,760614254E+00 5,034226770E-01 A12 = 7,337145847E+00 -2,244409511E+00 5,872194749E+00 -2,265979293E-01 A14 = -5,788044070E+00 1,926465138E+00 -3,991443994E+00 3,750611592E-02 A16 = 3,186972564E+00 -1,068335719E+00 1,870322548E+00 1,468842613E-02 A18 = -1,218219593E+00 4,037527628E-01 -6,185691090E-01 -1,115103292E-02 A20 = 3,135614596E-01 -1,056830673E-01 1,458422032E-01 3,485682956E-03 A22 = -4,949414925E-02 1,904942397E-02 -2,440187161E-02 -6,603890407E-04 A24 = 3,177816426E-03 -2,298046772E-03 2,833407419E-03 8,063212133E-05 A26 = 3,516853681E-04 1,742310333E-04 -2,172333416E-04 -6,227778796E-06 A28 = -8,331844837E-05 -7,267244055E-06 9,893468114E-06 2,777761251E-07 A30 = 4,851313163E-06 1,181144995E-07 -2,027536031E-07 -5,462693259E-09

[0117] In the third embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the first embodiment. The definitions of the parameters listed in Table 3C are also the same as those given in the first embodiment, with corresponding values ​​for the third embodiment, so no further explanation is required.

[0118] Furthermore, these parameters from Table 3A and Table 3B can be calculated as the following values ​​and must meet the following conditions: TABLE 3C Schematic parameters f [mm] 2,75 |f / R9|+|f / R10| 4,01 Fno 2,45 |TL / R8| 0,44 HFOV [Grade] 49,2 |R5 / R1| 0,41 FOV [degrees] 98,4 |R6 / R7| 0,70 TL / lmgH 1,39 |R9 / R2| 0,02 TL / f 1,58 |R11 / R1| 0,36 f / f5 2,00 CT1 / T12 0,90 |(f / f1+f / f2+f / f5) / ( / f3+f / f4+f / f6)| 1,20 CT1 / CT2 0,55 |f1 / f5| 4,26 (T12+T23) / (T34+T45+T56) 6,47 |f3 / f6| 1,29 T12 / T23 0,92 |f5 / f6| 0,58 V4 56,1 f23456 / SL 1,11 T34 / ET34 0,06 |f / R5|+|f / R6| 3,09 Y6R2 / Y1 R1 3,83 4. Design

[0119] Fig. Figure 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 4th embodiment. Fig.7 The image acquisition unit 4 comprises the imaging lens system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The imaging lens system comprises, in order from an object side to an image side along an optical axis, an aperture S1, a first lens element E1, an aperture diaphragm ST, a second lens element E2, an aperture S2, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a filter E7, and an image surface IMG. The imaging lens system comprises six lens elements (E1, E2, E3, E4, E5, and E6), with no additional lens element arranged between any of the adjacent six lens elements.

[0120] The first lens element E1, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The first lens element E1 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the first lens element E1 has an inflection point. The object-side surface of the first lens element E1 has a critical point in an off-axis region.

[0121] The second lens element E2, with positive refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical.

[0122] The third lens element E3, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces 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.

[0123] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is also concave in a paraxial region. The fourth lens element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fourth lens element E4 has two inflection points. The image-side surface of the fourth lens element E4 has three inflection points. The object-side surface of the fourth lens element E4 has two critical points in an off-axis region. The image-side surface of the fourth lens element E4 has one critical point in an off-axis region.

[0124] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has three inflection points. The image-side surface of the fifth lens element E5 has four inflection points. The object-side surface of the fifth lens element E5 has one critical point in an off-axis region. The image-side surface of the fifth lens element E5 has two critical points in an off-axis region.

[0125] The sixth lens element E6, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The sixth lens element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth lens element E6 has five inflection points. The image-side surface of the sixth lens element E6 has two inflection points. The object-side surface of the sixth lens element E6 has one critical point in an off-axis region. The image-side surface of the sixth lens element E6 has one critical point in an off-axis region.

[0126] The E7 filter is made of glass and is located between the sixth lens element E6 and the image surface IMG. It does not affect the focal length of the imaging lens system. The IS image sensor is located on or near the image surface IMG of the imaging lens system.

[0127] The detailed optical data of the 4th embodiment are listed in Table 4A and the aspherical surface data are listed in Table 4B below. TABLE 4A 4. Design f = 2.67 mm, Fno = 2.45, HFOV = 50.1 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture Plano 0,004 2 Lens 1 3,8568 (ASP) 0,297 plastic 1,544 56,0 5,84 3 -17,5613 (ASP) 0,001 4 Ape.-Blender Plano 0,305 5 Lens 2 -55,2133 (ASP) 0,537 plastic 1,544 56,0 4,79 6 -2,4965 (ASP) -0,266 7 Aperture Plano 0,612 8 Lens 3 -1,2357 (ASP) 0,281 plastic 1,669 19,5 -3,07 9 -3,3770 (ASP) 0,030 10 Lens 4 -4,9000 (ASP) 0,298 plastic 1,551 44,8 -5,78 11 9,2749 (ASP) 0,031 12 Lens 5 1,3015 (ASP) 0,542 plastic 1,545 56,1 1,36 13 -1,4623 (ASP) 0,041 14 Lens 6 1,0177 (ASP) 0,327 plastic 1,551 44,8 -2,33 15 0,5029 (ASP) 0,686 16 filter Plano 0,210 Glass 1,517 64,2 - 17 Plano 0,372 18 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). The effective radius of aperture S1 (surface 1) is 0.673 mm. An effective radius of aperture S2 (surface 7) is 0.890 mm. TABLE 4B Aspheric coefficients Surface # 2 3 5 6 k = 0,00000E+00 0,00000E+00 0,00000E+00 5,07059E-01 A4 = -1,012656838E-01 -1,591867491E-01 -2,037039449E-01 -2,280633755E-01 A6 = -6,495535733E-01 -6,969941647E-02 3,003809778E-01 -1,009039574E+00 A8 = 1,121371787E+01 -9,665687035E-01 1,296744201E+01 1,697521069E+01 A10 = -1,165425532E+02 -1,812063340E+00 -4,988801807E+02 -1,603542322E+02 A12 = 6,962607177E+02 1,643652324E+02 8,128750485E+03 9,997191389E+02 A14 = -2,505621960E+03 -1,541511519E+03 -8,118022196E+04 -4,353230177E+03 A16 = 5,359154997E+03 6,497918235E+03 5,462964152E+05 1,341757442E+04 A18 = -6,281226289E+03 -1,328760910E+04 -2,575196260E+06 -2,926155308E+04 A20 = 3,108685511E+03 1,072203348E+04 8,624189867E+06 4,465141268E+04 A22 = - - -2,044970999E+07 -4,645991754E+04 A24 = - - 3,358885379E+07 3,133718718E+04 A26 = - - -3,636829691E+07 -1,238063417E+04 A28 = - - 2,335686388E+07 2,236629763E+03 A30 = - - -6,740832377E+06 -4,277486793E+01 Surface # 8 9 10 11 k = -7,07117E-01 -5,21179E-01 0,00000E+00 0,00000E+00 A4 = -1,594753414E+00 -1,335398613E+00 9,497850205E-01 8,538929407E-01 A6 = 8,942321275E+00 7,051094035E+00 -3,428135670E+00 -5,426580064E+00 A8 = -5,829415140E+01 -3,446320499E+01 1,105973344E+01 1,716691182E+01 A10 = 3,273122160E+02 1,360448911E+02 -2,650916831E+01 -3,353063999E+01 A12 = -1,210835748E+03 -3,919167293E+02 4,572145829E+01 4,446742690E+01 A14 = 2,502636622E+03 7,973500252E+02 -5,794831027E+01 -4,213613255E+01 A16 = -1,122172158E+03 -1,140463952E+03 5,516979906E+01 2,935884928E+01 A18 = -8,758398970E+03 1,142867346E+03 -3,990504754E+01 -1,525475302E+01 A20 = 2,764903191E+04 -7,889110792E+02 2,188790208E+01 5,919133673E+00 A22 = -4,318510323E+04 3,581423808E+02 -8,958020267E+00 -1,694349120E+00 A24 = 4,101057199E+04 -9,458580979E+01 2,645897205E+00 3,473993699E-01 A26 = -2,395754640E+04 8,424274152E+00 -5,313435427E-01 -4,821472715E-02 A28 = 7,940133914E+03 2,064584151E+00 6,471583110E-02 4,049898551E-03 A30 = -1,144804538E+03 -4,605109386E-01 -3,595990112E-03 -1,551288973E-04 Surface # 12 13 14 15 k = -4,33865E+00 -2,11006E+00 -4,08905E+00 -2,87837E+00 A4 = 3,675001555E-01 1,288743042E+00 2,781086806E-01 -2,648412943E-01 A6 = -1,353315343E+00 -1,362256192E+00 -1,588768054E+00 4,110267120E-01 A8 = 3,271268695E+00 -8,540382940E-03 3,752673323E+00 -5,985675768E-01 A10 = -5,294289829E+00 1,877970419E+00 -5,870793115E+00 5,141066355E-01 A12 = 5,757179705E+00 -2,889261246E+00 5,987236707E+00 -2,432740050E-01 A14 = -4,351227952E+00 2,492619026E+00 -4,071991363E+00 5,121249054E-02 A16 = 2,329180833E+00 -1,413203360E+00 1,909590258E+00 7,604759451E-03 A18 = -8,931155359E-01 5,527436921E-01 -6,321643200E-01 -8,688834391E-03 A20 = 2,478571703E-01 -1,517197763E-01 1,492044511E-01 2,893731568E-03 A22 = -5,028101741E-02 2,916819187E-02 -2,499122130E-02 -5,615086259E-04 A24 = 7,480571780E-03 -3,844621511E-03 2,904831985E-03 6,935001934E-05 A26 = -7,968891738E-04 3,306068538E-04 -2,229163507E-04 -5,388334346E-06 A28 = 5,520036509E-05 -1,667716649E-05 1,016006854E-05 2,410462223E-07 A30 = -1,856128749E-06 3,733880494E-07 -2,083291211E-07 -4,745520445E-09

[0128] In the fourth embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the first embodiment. The definitions of the parameters listed in Table 4C are also the same as those given in the first embodiment, with corresponding values ​​for the fourth embodiment, so no further explanation is necessary.

[0129] Furthermore, these parameters from Table 4A and Table 4B can be calculated as the following values ​​and must meet the following conditions: TABLE 4C Schematic parameters f [mm] 2,67 |f / R9|+|f / R10| 3,87 Fno 2,45 |TL / R8| 0,46 HFOV [Grade] 50,1 |R5 / R1| 0,32 FOV [degrees] 100,2 |R6 / R7| 0,69 TL / lmgH 1,37 |R9 / R2| 0,07 TL / f 1,61 |R11 / R1| 0,26 f / f5 1,96 CT1 / T12 0,97 |(f / f1+f / f2+f / f5) / ( / f3+f / f4+f / f6)| 1,20 CT1 / CT2 0,55 |f1 / f5| 4,30 (T12+T23) / (T34+T45+T56) 6,39 |f3 / f6| 1,32 T12 / T23 0,88 |f5 / f6| 0,58 V4 44,8 f23456 / SL 1,06 T34 / ET34 0,05 |f / R5|+|f / R6| 2,95 Y6R2 / Y1 R1 3,87 5. Design

[0130] Fig. Figure 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 5th embodiment. Fig.9 The image acquisition unit 5 comprises the imaging lens system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The imaging lens system comprises, in order from an object side to an image side along an optical axis, an aperture S1, a first lens element E1, an aperture diaphragm ST, a second lens element E2, an aperture S2, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a filter E7, and an image surface IMG. The imaging lens system comprises six lens elements (E1, E2, E3, E4, E5, and E6), with no additional lens element arranged between any of the adjacent six lens elements.

[0131] The first lens element E1, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The first lens element E1 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the first lens element E1 has an inflection point. The object-side surface of the first lens element E1 has a critical point in an off-axis region.

[0132] The second lens element E2, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces 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.

[0133] The third lens element E3, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces 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.

[0134] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is also concave in a paraxial region. The fourth lens element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fourth lens element E4 has two inflection points. The image-side surface of the fourth lens element E4 has three inflection points. The object-side surface of the fourth lens element E4 has two critical points in an off-axis region. The image-side surface of the fourth lens element E4 has one critical point in an off-axis region.

[0135] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has three inflection points. The image-side surface of the fifth lens element E5 has four inflection points. The object-side surface of the fifth lens element E5 has one critical point in an off-axis region. The image-side surface of the fifth lens element E5 has two critical points in an off-axis region.

[0136] The sixth lens element E6, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The sixth lens element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth lens element E6 has five inflection points. The image-side surface of the sixth lens element E6 has three inflection points. The object-side surface of the sixth lens element E6 has one critical point in an off-axis region. The image-side surface of the sixth lens element E6 has one critical point in an off-axis region.

[0137] The E7 filter is made of glass and is located between the sixth lens element E6 and the image surface IMG. It does not affect the focal length of the imaging lens system. The IS image sensor is located on or near the image surface IMG of the imaging lens system.

[0138] The detailed optical data of the 5th embodiment are listed in Table 5A and the aspherical surface data are listed in Table 5B below. TABLE 5A 5. Design f = 2.59 mm, Fno = 2.45, HFOV = 51.0 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture Plano 0,002 2 Lens 1 4,0024 (ASP) 0,297 plastic 1,545 56,1 5,89 3 -15,7734 (ASP) 0,003 4 Ape.-Blender Plano 0,302 5 Lens 2 52,6394 (ASP) 0,579 plastic 1,544 56,0 4,72 6 -2,6913 (ASP) -0,241 7 Aperture Plano 0,537 8 Lens 3 -1,1895 (ASP) 0,290 plastic 1,669 19,5 -2,94 9 -3,3033 (ASP) 0,030 10 Lens 4 -5,0915 (ASP) 0,301 plastic 1,544 56,0 -5,65 11 7,9102 (ASP) 0,030 12 Lens 5 1,2441 (ASP) 0,543 plastic 1,544 56,0 1,31 13 -1,4007 (ASP) 0,030 14 Lens 6 1,0023 (ASP) 0,323 plastic 1,534 56,0 -2,31 15 0,4915 (ASP) 0,719 16 filter Plano 0,210 Glass 1,517 64,2 - 17 Plano 0,352 18 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 1) is 0.655 mm. An effective radius of aperture S2 (surface 7) is 0.915 mm. TABLE 5B Aspheric coefficients Surface # 2 3 5 6 k = 0,00000E+00 0,00000E+00 0,00000E+00 -1,09757E+00 A4 = -1,031077571E-01 -1,420136661E-01 -2,870075859E-01 -2,518238084E-01 A6 = -5,200585205E-01 -4,747811968E-01 3,855602846E+00 -1,627335694E+00 A8 = 7,849517543E+00 3,873625322E+00 -6,743420208E+01 2,723287370E+01 A10 = -7,360447931E+01 -3,429896218E+01 7,144737091E+02 -2,339300312E+02 A12 = 3,980091587E+02 2,957678719E+02 -4,652837738E+03 1,299636069E+03 A14 = -1,304021147E+03 -1,946188273E+03 1,557194347E+04 -5,030647118E+03 A16 = 2,546145929E+03 7,724637749E+03 1,440504839E+04 1,394177327E+04 A18 = -2,731988907E+03 -1,616263997E+04 -4,524650895E+05 -2,784128509E+04 A20 = 1,243698112E+03 1,372543570E+04 2,524725853E+06 3,970969316E+04 A22 = - - -8,048459663E+06 -3,947793764E+04 A24 = - - 1,630416308E+07 2,611852982E+04 A26 = - - -2,077874934E+07 -1,054835161E+04 A28 = - - 1,524074922E+07 2,167125540E+03 A30 = - - -4,915111479E+06 -1,301926555E+02 Surface # 8 9 10 11 k = -8,19020E-01 -1,17974E+00 0,00000E+00 0,00000E+00 A4 = -1,570445453E+00 -1,200926028E+00 1,080252295E+00 8,966944961E-01 A6 = 6,883087212E+00 5,344627828E+00 -4,406622299E+00 -5,710272787E+00 A8 = -2,860614551E+01 -2,338357836E+01 1,553602115E+01 1,814201080E+01 A10 = 6,268704626E+01 8,742876219E+01 -3,977909361E+01 -3,553024778E+01 A12 = 4,914047397E+02 -2,316522311E+02 7,251666676E+01 4,708533216E+01 A14 = -5,487214192E+03 3,843951335E+02 -9,638159889E+01 -4,453120387E+01 A16 = 2,618457670E+04 -3,089205476E+02 9,534300499E+01 3,103181382E+01 A18 = -7,649275447E+04 -1,374941942E+02 -7,085210473E+01 -1,620435891E+01 A20 = 1,487780139E+05 6,780672393E+02 3,944444060E+01 6,359792756E+00 A22 = -1,971699136E+05 -8,575446245E+02 -1,620086628E+01 -1,853778158E+00 A24 = 1,763917185E+05 6,086597032E+02 4,758640491E+00 3,893177205E-01 A26 = -1,020645447E+05 -2,599964832E+02 -9,443314722E-01 -5,559280872E-02 A28 = 3,450662502E+04 6,270420988E+01 1,132566350E-01 4,819082675E-03 A30 = -5,177398255E+03 -6,596492225E+00 -6,189878204E-03 -1,908571695E-04 Surface # 12 13 14 15 k = -4,31802E+00 -1,96833E+00 -4,13229E+00 -2,85390E+00 A4 = 3,759763948E-01 1,275112736E+00 2,958707215E-01 -2,542823447E-01 A6 = -1,434389593E+00 -1,273024231E+00 -1,704146068E+00 3,285424843E-01 A8 = 3,622707465E+00 -9,917827253E-02 4,054041761E+00 -3,819087687E-01 A10 = -6,111607162E+00 1,687322465E+00 -6,311163928E+00 2,233286067E-01 A12 = 6,847098360E+00 -2,296577702E+00 6,398764282E+00 -2,055160446E-03 A14 = -5,216150636E+00 1,772518963E+00 -4,335173604E+00 -8,415823598E-02 A16 = 2,716221856E+00 -8,943431535E-01 2,029156460E+00 6,134852992E-02 A18 = -9,533985530E-01 3,060708855E-01 -6,715097164E-01 -2,408945613E-02 A20 = 2,155059771E-01 -7,117178616E-02 1,586375638E-01 6,091633464E-03 A22 = -2,717484511E-02 1,093455762E-02 -2,662663236E-02 -1,037960074E-03 A24 = 6,323494437E-04 -1,025985942E-03 3,104914811E-03 1,189622588E-04 A26 = 3,342997380E-04 4,631498305E-05 -2,393253905E-04 -8,814412154E-06 A28 = -4,649068598E-05 1,980349473E-07 1,097041724E-05 3,819642172E-07 A30 = 2,040029511E-06 -7,392747000E-08 -2,265558252E-07 -7,357832772E-09

[0139] In the 5th embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the 1st embodiment. The definitions of the parameters listed in Table 5C are also the same as those given in the 1st embodiment, with corresponding values ​​for the 5th embodiment, so no further explanation is required.

[0140] Furthermore, these parameters from Table 5A and Table 5B can be calculated as the following values ​​and must meet the following conditions: TABLE 5C Schematic parameters f [mm] 2,59 |f / R9|+|f / R10| 3,94 Fno 2,45 |TL / R8| 0,54 HFOV [Grade] 51,0 |R5 / R1| 0,30 FOV [degrees] 102,0 |R6 / R7| 0,65 TL / lmgH 1,37 |R9 / R2| 0,08 TL / f 1,66 |R11 / R1| 0,25 f / f5 1,99 CT1 / T12 0,97 |(f / f1+f / f2+f / f5) / ( / f3+f / f4+f / f6)| 1,21 CT1 / CT2 0,51 |f1 / f5| 4,51 (T12+T23) / (T34+T45+T56) 6,68 |f3 / f6| 1,27 T12 / T23 1,03 |f5 / f6| 0,56 V4 56,0 f23456 / SL 0,98 T34 / ET34 0,05 |f / R5|+|f / R6| 2,96 Y6R2 / Y1 R1 3,98 6. Design

[0141] Fig. Figure 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 acquisition unit 6 comprises the imaging lens system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The imaging lens system comprises, in order from an object side to an image side along an optical axis, an aperture S1, a first lens element E1, an aperture diaphragm ST, a second lens element E2, an aperture S2, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a filter E7, and an image surface IMG. The imaging lens system comprises six lens elements (E1, E2, E3, E4, E5, and E6), with no additional lens element arranged between any of the adjacent six lens elements.

[0142] The first lens element E1, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The first lens element E1 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the first lens element E1 has an inflection point.

[0143] The second lens element E2, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces 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.

[0144] The third lens element E3, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces 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.

[0145] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The fourth lens element E4 is made of plastic material and both its object-side and image-side surfaces are aspheric. The object-side surface of the fourth lens element E4 has two inflection points. The image-side surface of the fourth lens element E4 has six inflection points. The object-side surface of the fourth lens element E4 has two critical points in an off-axis region. The image-side surface of the fourth lens element E4 has two critical points in an off-axis region.

[0146] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has three inflection points. The image-side surface of the fifth lens element E5 has four inflection points. The object-side surface of the fifth lens element E5 has one critical point in an off-axis region. The image-side surface of the fifth lens element E5 has two critical points in an off-axis region.

[0147] The sixth lens element E6, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The sixth lens element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth lens element E6 has five inflection points. The image-side surface of the sixth lens element E6 has two inflection points. The object-side surface of the sixth lens element E6 has one critical point in an off-axis region. The image-side surface of the sixth lens element E6 has one critical point in an off-axis region.

[0148] The E7 filter is made of glass and is located between the sixth lens element E6 and the image surface IMG. It does not affect the focal length of the imaging lens system. The IS image sensor is located on or near the image surface IMG of the imaging lens system.

[0149] The detailed optical data of the 6th embodiment are listed in Table 6A and the aspherical surface data are listed in Table 6B below. TABLE 6A 6. Design f = 2.69 mm, Fno = 2.45, HFOV = 49.3 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture Plano -0,007 2 Lens 1 3,2006 (ASP) 0,280 plastic 1,544 56,0 5,86 3 -732,4926 (ASP) 0,010 4 Ape.-Blender Plano 0,311 5 Lens 2 116,0079 (ASP) 0,535 plastic 1,544 56,0 4,75 6 -2,6406 (ASP) -0,270 7 Aperture Plano 0,630 8 Lens 3 -1,2989 (ASP) 0,279 plastic 1,657 21,3 -3,01 9 -4,1039 (ASP) 0,030 10 Lens 4 -3,9573 (ASP) 0,311 plastic 1,551 44,8 -7,83 11 -49,5617 (ASP) 0,030 12 Lens 5 1,3506 (ASP) 0,510 plastic 1,544 56,0 1,44 13 -1,6174 (ASP) 0,044 14 Lens 6 1,0418 (ASP) 0,328 plastic 1,551 44,8 -2,37 15 0,5146 (ASP) 0,686 16 filter Plano 0,210 Glass 1,517 64,2 - 17 Plano 0,352 18 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). The effective radius of aperture S1 (surface 1) is 0.664 mm. An effective radius of aperture S2 (surface 7) is 0.884 mm. TABLE 6B Aspheric coefficients Surface # 2 3 5 6 k = 0,00000E+00 0,00000E+00 0,00000E+00 1,27067E+00 A4 = -1,190974420E-01 -1,208610398E-01 -2,794079411E-01 -2,281019459E-01 A6 = 1,072805487E-01 -1,297887484E+00 4,434457245E+00 -9,583093835E-01 A8 = -1,263924029E+00 2,235476268E+01 -1,088607260E+02 1,876759592E+01 A10 = -1,762693998E+00 -2,577502530E+02 1,706842246E+03 -2,151083962E+02 A12 = 6,114094907E+01 1,859214862E+03 -1,826755295E+04 1,638557984E+03 A14 = -3,505629087E+02 -8,442741278E+03 1,375294871E+05 -8,761515385E+03 A16 = 9,699280750E+02 2,339605111E+04 -7,438306272E+05 3,362152743E+04 A18 = -1,357330904E+03 -3,609460683E+04 2,920822068E+06 -9,352435698E+04 A20 = 7,710002739E+02 2,374313453E+04 -8,330763091E+06 1,885459816E+05 A22 = - - 1,707028586E+07 -2,722951369E+05 A24 = - - -2,447050802E+07 2,741221283E+05 A26 = - - 2,328630531E+07 -1,823748511E+05 A28 = - - -1,321186420E+07 7,194230605E+04 A30 = - - 3,382502612E+06 -1,271703636E+04 Surface # 8 9 10 11 k = -6,25746E-01 -1,60312E+00 0,00000E+00 0,00000E+00 A4 = -1,589736332E+00 -1,451719485E+00 9,236748275E-01 9,471217279E-01 A6 = 9,421805003E+00 8,950762285E+00 -3,208180170E+00 -6,664924007E+00 A8 = -6,363385668E+01 -4,928877621E+01 1,068210501E+01 2,421150610E+01 A10 = 3,671320527E+02 2,132754942E+02 -2,735431654E+01 -5,569530354E+01 A12 = -1,523618999E+03 -6,874392274E+02 5,061000617E+01 8,901060751E+01 A14 = 4,396767056E+03 1,636064303E+03 -6,809534345E+01 -1,034443286E+02 A16 = -8,669025156E+03 -2,888538722E+03 6,749115896E+01 8,922995473E+01 A18 = 1,104719114E+04 3,799955143E+03 -4,956450100E+01 -5,742472392E+01 A20 = -7,251456334E+03 -3,716502572E+03 2,687527311E+01 2,740616415E+01 A22 = -1,736951594E+03 2,668247910E+03 -1,060499084E+01 -9,537252758E+00 A24 = 8,482873569E+03 -1,367165668E+03 2,956867914E+00 2,345512857E+00 A26 = -7,970662342E+03 4,735622524E+02 -5,513477377E-01 -3,854453389E-01 A28 = 3,570741325E+03 -9,941122572E+01 6,160316262E-02 3,791670368E-02 A30 = -6,573287465E+02 9,553182876E+00 -3,113384493E-03 -1,686625794E-03 Surface # 12 13 14 15 k = -4,38739E+00 -2,13354E+00 -4,01590E+00 -2,88516E+00 A4 = 3,835568937E-01 1,264317661E+00 2,805608984E-01 -2,357853543E-01 A6 = -1,580807194E+00 -1,095208187E+00 -1,645666940E+00 2,839666392E-01 A8 = 4,584148862E+00 -9,791112470E-01 3,998837515E+00 -2,867033673E-01 A10 = -9,180216997E+00 3,728064568E+00 -6,374372795E+00 8,286336384E-02 A12 = 1,271853761E+01 -5,070867485E+00 6,600620682E+00 1,235281459E-01 A14 = -1,260227193E+01 4,235150425E+00 -4,565193118E+00 -1,557500642E-01 A16 = 9,134004779E+00 -2,402954114E+00 2,184897238E+00 8,876021595E-02 A18 = -4,906859028E+00 9,614067153E-01 -7,413387549E-01 -3,136402657E-02 A20 = 1,958700213E+00 -2,748400948E-01 1,801496382E-01 7,448274730E-03 A22 = -5,743490517E-01 5,593098144E-02 -3,121083691E-02 -1,215404778E-03 A24 = 1,200987797E-01 -7,925896116E-03 3,769674906E-03 1,349226312E-04 A26 = -1,691434841E-02 7,442435726E-04 -3,019732269E-04 -9,756773079E-06 A28 = 1,434049071E-03 -4,166486045E-05 1,443169595E-05 4,149694547E-07 A30 = -5,515556499E-05 1,053525574E-06 -3,116626789E-07 -7,880397641E-09

[0150] In the 6th embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the 1st embodiment. The definitions of the parameters listed in Table 6C are also the same as those given in the 1st embodiment, with corresponding values ​​for the 6th embodiment, so no further explanation is required.

[0151] Furthermore, these parameters from Table 6A and Table 6B can be calculated as the following values ​​and must meet the following conditions: TABLE 6C Schematic parameters f [mm] 2,69 |f / R9|+|f / R10| 3,66 Fno 2,45 |TL / R8| 0,09 HFOV [Grade] 49,3 |R5 / R1| 0,41 FOV [degrees] 98,6 |R6 / R7| 1,04 TL / lmgH 1,37 |R9 / R2| 0,002 TL / f 1,59 |R11 / R1| 0,33 f / f5 1,87 CT1 / T12 0,87 |(f / f1+f / f2+f / f5) / ( / f3+f / f4+f / f6)| 1,22 CT1 / CT2 0,52 |f1 / f5| 4,07 (T12+T23) / (T34+T45+T56) 6,55 |f3 / f6| 1,27 T12 / T23 0,89 |f5 / f6| 0,61 V4 44,8 f23456 / SL 1,09 T34 / ET34 0,06 |f / R5|+|f / R6| 2,73 Y6R2 / Y1 R1 3,90 7. Design

[0152] Fig. Figure 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 acquisition unit 7 comprises the imaging lens system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The imaging lens system comprises, in order from an object side to an image side along an optical axis, an aperture S1, a first lens element E1, an aperture diaphragm ST, a second lens element E2, an aperture S2, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6, a filter E7, and an image surface IMG. The imaging lens system comprises six lens elements (E1, E2, E3, E4, E5, and E6), with no additional lens element arranged between any of the adjacent six lens elements.

[0153] The first lens element E1, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The first lens element E1 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the first lens element E1 has an inflection point. The object-side surface of the first lens element E1 has a critical point in an off-axis region.

[0154] The second lens element E2, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces 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.

[0155] The third lens element E3, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces 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.

[0156] The fourth lens element E4, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The fourth lens element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fourth lens element E4 has two inflection points. The image-side surface of the fourth lens element E4 has two inflection points. The object-side surface of the fourth lens element E4 has a critical point in an off-axis region. The image-side surface of the fourth lens element E4 has a critical point in an off-axis region.

[0157] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has three inflection points. The image-side surface of the fifth lens element E5 has four inflection points. The object-side surface of the fifth lens element E5 has one critical point in an off-axis region. The image-side surface of the fifth lens element E5 has four critical points in an off-axis region.

[0158] The sixth lens element E6, with negative refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The sixth lens element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth lens element E6 has three inflection points. The image-side surface of the sixth lens element E6 has five inflection points. The object-side surface of the sixth lens element E6 has three critical points in an off-axis region. The image-side surface of the sixth lens element E6 has one critical point in an off-axis region.

[0159] The E7 filter is made of glass and is located between the sixth lens element E6 and the image surface IMG of the imaging lens system. It does not affect the focal length of the imaging lens system. The IS image sensor is located on or near the image surface IMG of the imaging lens system.

[0160] The detailed optical data of the 7th embodiment are listed in Table 7A and the aspherical surface data are listed in Table 7B below. TABLE 7A 7. Design f = 2.55 mm, Fno = 2.30, HFOV = 51.5 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture Plano 0,005 2 Lens 1 4,0278 (ASP) 0,343 plastic 1,544 56,0 5,85 3 -14,6621 (ASP) -0,001 4 Ape.-Blender Plano 0,323 5 Lens 2 55,6226 (ASP) 0,508 plastic 1,544 56,0 4,64 6 -2,6358 (ASP) -0,293 7 Aperture Plano 0,638 8 Lens 3 -1,0920 (ASP) 0,250 plastic 1,669 19,5 -2,61 9 -3,1887 (ASP) 0,030 10 Lens 4 37,0370 (ASP) 0,353 plastic 1,551 44,8 -11,55 11 5,4112 (ASP) 0,032 12 Lens 5 1,3751 (ASP) 0,497 plastic 1,551 44,8 1,49 13 -1,7663 (ASP) 0,061 14 Lens 6 0,8821 (ASP) 0,308 plastic 1,582 30,2 -2,91 15 0,5055 (ASP) 0,686 16 filter Plano 0,210 Glass 1,517 64,2 - 17 Plano 0,292 18 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 1) is 0.715 mm. An effective radius of aperture S2 (surface 7) is 0.893 mm. TABLE 7B Aspheric coefficients Surface # 2 3 5 6 k = 0,00000E+00 0,00000E+00 0,00000E+00 5,69302E-01 A4 = -9,626511508E-02 -1,579264391E-01 -1,851259826E-01 -2,439440129E-01 A6 = -1,853323214E-01 -6,769559810E-02 4,118806566E-01 -1,118933474E-01 A8 = 5,360704237E-01 -1,415612667E-02 -3,855491152E+00 1,622193423E+00 A10 = -1,350517310E+00 -2,215968606E-01 1,739444096E+01 -8,877766024E+00 A12 = 1,092963564E+00 6,307659252E-01 -5,057475641E+01 2,243012412E+01 A14 = - - 8,860756998E+01 -2,989784793E+01 A16 = - - -8,705197134E+01 1,959361406E+01 A18 = - - 3,656381764E+01 -4,794207200E+00 Surface # 8 9 10 11 k = -7,58567E-01 3,50910E-01 0,00000E+00 0,00000E+00 A4 = -1,933849384E+00 -1,398366600E+00 8,042495993E-01 6,054275477E-01 A6 = 1,361014583E+01 8,677238192E+00 -2,335982874E+00 -4,196756610E+00 A8 = -8,167958396E+01 -4,135866747E+01 4,757916232E+00 1,439983816E+01 A10 = 3,678578339E+02 1,360730089E+02 -6,059770620E+00 -3,045626704E+01 A12 = -1,174526697E+03 -3,130748228E+02 2,850781003E+00 4,373273469E+01 A14 = 2,604856586E+03 5,110531228E+02 4,874355777E+00 -4,474801312E+01 A16 = -3,943612569E+03 -5,930124619E+02 -1,181834558E+01 3,333160666E+01 A18 = 3,969652396E+03 4,846282690E+02 1,292779088E+01 -1,819537255E+01 A20 = -2,528801853E+03 -2,722976015E+02 -8,924400770E+00 7,255555272E+00 A22 = 9,196347515E+02 1,000737009E+02 4,143012697E+00 -2,085092733E+00 A24 = -1,451644385E+02 -2,165093984E+01 -1,294524206E+00 4,199221076E-01 A26 = - 2,089211369E+00 2,615456128E-01 -5,619332814E-02 A28 = - - -3,087876733E-02 4,486009825E-03 A30 = - - 1,617469987E-03 -1,616566661E-04 Surface # 12 13 14 15 k = -4,12160E+00 -2,30566E+00 -3,52488E+00 -3,05300E+00 A4 = 3,586243092E-01 1,226986524E+00 1,564072702E-01 -1,928774775E-01 A6 = -1,070884454E+00 -8,166839460E-01 -6,770942107E-01 5,211982672E-01 A8 = 2,327070934E+00 -1,642995683E+00 1,317569692E+00 -1,154288166E+00 A10 = -3,699754844E+00 4,158581678E+00 -2,013861636E+00 1,429157383E+00 A12 = 3,714786925E+00 -4,529427417E+00 1,990212847E+00 -1,126324425E+00 A14 = -1,969364168E+00 3,037137966E+00 -1,265631815E+00 6,072306316E-01 A16 = 5,807281854E-02 -1,374157161E+00 5,409563453E-01 -2,318172696E-01 A18 = 6,662669166E-01 4,350156082E-01 -1,604771202E-01 6,366098426E-02 A20 = -4,899140978E-01 -9,747477836E-02 3,352180077E-02 -1,261293184E-02 A22 = 1,872185959E-01 1,535917736E-02 -4,917042136E-03 1,785823707E-03 A24 = -4,362424176E-02 -1,657997008E-03 4,953824293E-04 -1,761217944E-04 A26 = 6,242478293E-03 1,160021627E-04 -3,258968929E-05 1,148676406E-05 A28 = -5,064426660E-04 -4,692172717E-06 1,257485680E-06 -4,451163550E-07 A30 = 1,789708833E-05 8,196444618E-08 -2,150497560E-08 7,756549705E-09

[0161] In the 7th embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the 1st embodiment. The definitions of the parameters listed in Table 7C are also the same as those given in the 1st embodiment, with corresponding values ​​for the 7th embodiment, so no further explanation is required.

[0162] Furthermore, these parameters from Table 7A and Table 7B can be calculated as the following values ​​and must meet the following conditions: TABLE 7C Schematic parameters f [mm] 2,55 |f / R9|+lf / R10| 3,29 Fno 2,30 |TL / R8| 0,78 HFOV [deg,] 51,5 |R5 / R1| 0,27 FOV [deg,] 103,0 |R6 / R7| 0,09 TL / lmgH 1,35 |R9 / R2| 0,09 TL / f 1,66 |R11 / R1| 0,22 f / f5 1,71 CT1 / T12 1,07 |(f / f1+f / f2+f / f5) / ( / f3+f / f4+f / f6)| 1,30 CT1 / CT2 0,68 |f1 / f5| 3,93 (T12+T23) / (T34+T45+T56) 5,42 |f3 / f6| 0,90 T12 / T23 0,93 |f5 / f6| 0,51 V4 44,8 f23456 / SL 0,99 T34 / ET34 0,05 |f / R5|+|f / R6| 3,13 Y6R2 / Y1 R1 3,71 8. Design

[0163] Fig.Figure 15 is a perspective view of an image acquisition unit according to the 8th embodiment of the present disclosure. In this embodiment, an image acquisition unit 100 is a camera module comprising a lens unit 101, a drive device 102, an image sensor 103, and an image stabilizer 104. The lens unit 101 comprises the imaging lens system disclosed in the 1st embodiment, a tube, and a retaining element (whose reference numerals have been omitted) for holding the imaging lens system. However, the lens unit 101 can alternatively be provided with the imaging lens system disclosed in other embodiments of the present disclosure, and the present disclosure is not limited thereto.The imaging light is focused in the lens unit 101 of the image acquisition unit 100 to generate an image with the drive device 102, which is used to focus the image onto the image sensor 103, and the generated image is then digitally transmitted to other electronic components for further processing.

[0164] The drive unit 102 can have an autofocus function, and different drive configurations can be achieved by using voice coil motors (VCMs), microelectromechanical systems (MEMS), piezoelectric systems, or shape memory alloys. The drive unit 102 is advantageous for achieving better image positioning of the lens unit 101, enabling the lens unit 101 to capture a clear image of the imaged object at varying object distances. The image sensor 103 (e.g., CCD or CMOS), which can be characterized by high light sensitivity and low noise, is positioned on the image surface of the imaging lens system to achieve higher image quality.

[0165] The image stabilizer 104, for example an accelerometer, a gyroscope, and a Hall-effect sensor, is designed to work in conjunction with the drive unit 102 to achieve optical image stabilization (OIS). The drive unit 102, working in conjunction with the image stabilizer 104, is advantageous for compensating for panning and tilting movements of the lens unit 101, thereby reducing motion blur during exposure. In some cases, this compensation can be achieved through electronic image stabilization (EIS) using image processing software, which improves image quality in motion or low-light conditions. 9. Design

[0166] Fig. Figure 16 is a perspective view of an electronic device according to the 9th embodiment of the present disclosure. Fig.Figure 17 is another perspective view of the electronic device in Fig. 16.

[0167] In this embodiment, an electronic device 200 is a smartphone comprising the image acquisition unit 100, an image acquisition unit 100a, an image acquisition unit 100b, an image acquisition unit 100c, and a display module 201 disclosed in the 8th embodiment. As in Fig. As shown in Figure 16, the image acquisition unit 100, the image acquisition unit 100a, and the image acquisition unit 100b are arranged on the same side of the electronic device 200 and facing the same side, and each of the image acquisition units 100, 100a, and 100b has a single focal point. As shown in Fig.As shown in Figure 17, the image acquisition unit 100c and the display module 201 are arranged on the opposite side of the electronic device 200, so that the image acquisition unit 100c can be a forward-facing camera of the electronic device 200 for taking selfies, but the present disclosure is not limited to this. Furthermore, each of the image acquisition units 100a, 100b, and 100c can comprise the imaging lens system of the present disclosure and have a similar configuration to the image acquisition unit 100. Specifically, each of the image acquisition units 100a, 100b, and 100c can comprise a lens unit, a drive device, an image sensor, and an image stabilizer, and each of the lens units can comprise an imaging lens system, such as the imaging lens system of the present disclosure, a tube, and a retaining element for holding the imaging lens system.

[0168] Image capture unit 100 is a wide-angle image capture unit, image capture unit 100a is a telephoto image capture unit, image capture unit 100b is an ultra-wide-angle image capture unit, and image capture unit 100c is a wide-angle image capture unit. In this embodiment, image capture units 100, 100a, and 100b have different fields of view, allowing the electronic device to have 200 different magnification ratios to meet the requirements of the optical zoom function. Furthermore, image capture unit 100c, as shown in Fig.As shown in Figure 17, the image acquisition unit 100c has a non-circular opening, and the tube or lens elements in the image acquisition unit 100c can have one or more clipped edges at outer diameter positions to conform to the non-circular opening. Therefore, to further reduce the length of the image acquisition unit 100c along a single axis, and thereby decrease the overall size of the lens, it is advantageous to increase the area ratio of the display module 201 to the electronic device 200, to decrease the thickness of the electronic device 200, and to achieve overall module compactness. In this embodiment, the electronic device 200 comprises several image acquisition units 100, 100a, 100b, and 100c, but the present disclosure is not limited to the number and arrangement of the image acquisition units. 10. Design

[0169] Fig.Figure 18 is a perspective view of an electronic device according to the 10th embodiment of the present disclosure. Fig. Figure 19 is another perspective view of the electronic device in Fig. 18. Fig. 20 is a block diagram of the electronic device in Fig. 18.

[0170] In this embodiment, an electronic device 300 is a smartphone comprising the image acquisition unit 100, an image acquisition unit 100d, an image acquisition unit 100e, an image acquisition unit 100f, an image acquisition unit 100g, a flash module 301, a focusing aid module 302, an image signal processor 303, a display module 304, and an image software processor 305, as disclosed in the 8th embodiment. The image acquisition unit 100 and the image acquisition unit 100d are arranged on the same side of the electronic device 300. The focusing aid module 302 can be a laser distance meter or a ToF (Time of Flight) module, but the present disclosure is not limited to this.The image acquisition unit 100e, the image acquisition unit 100f, the image acquisition unit 100g, and the display module 304 are arranged on the opposite side of the electronic device 300, and the display module 304 can be a user interface, so that the image acquisition units 100e, 100f, and 100g can be forward-facing cameras of the electronic device 300 for taking selfies, but the present disclosure is not limited to this. Furthermore, each of the image acquisition units 100d, 100e, 100f, and 100g can include the imaging lens system of the present disclosure and have a similar configuration to the image acquisition unit 100.Specifically, each of the image acquisition units 100d, 100e, 100f and 100g can comprise a lens unit, a drive device, an image sensor and an image stabilizer, and each of the lens units can comprise an imaging lens system, such as the imaging lens system of the present disclosure, a tube and a holding element for holding the imaging lens system.

[0171] Image acquisition unit 100 is a wide-angle image acquisition unit, image acquisition unit 100d is an ultra-wide-angle image acquisition unit, image acquisition unit 100e is a wide-angle image acquisition unit, image acquisition unit 100f is an ultra-wide-angle image acquisition unit, and image acquisition unit 100g is a time-of-flight (ToF) image acquisition unit. In this embodiment, image acquisition units 100 and 100d have different fields of view, so that the electronic device 300 can have different magnification ratios to meet the requirements of the optical zoom function. In addition, image acquisition unit 100g can determine depth information of the imaged object. In this embodiment, the electronic device 300 comprises multiple image acquisition units 100, 100d, 100e, 100f, and 100g, but the present disclosure is not limited to the number and arrangement of the image acquisition units.

[0172] When a user takes pictures of an object 306, the light beams are focused in the image acquisition unit 100 or image acquisition unit 100d to produce images, and the flash module 301 is activated for illumination support. The focus assist module 302 detects the object distance of the imaged object 306 to achieve fast autofocus. The image signal processor 303 is designed to optimize the captured image to improve image quality. The light beam emitted by the focus assist module 302 can be either conventional infrared light or laser light. Additionally, the light beams are focused in the image acquisition unit 100e, 100f, or 100g to produce images. The display module 304 can include a touchscreen, and the user can interact with the display module 304 and the multi-functional image software processor 305 to capture images and perform image processing.Alternatively, the user can take pictures using a physical button. The image processed by the 305 image software processor can be displayed on the 304 display module. 11. Design

[0173] Fig. Figure 21 is a perspective view of an electronic device according to the 11th embodiment of the present disclosure.

[0174] In this embodiment, an electronic device 400 is a smartphone comprising the image acquisition unit 100, an image acquisition unit 100h, an image acquisition unit 100i, a flash module 401, a focusing aid module, an image signal processor, a display module, and an image software processor (not shown) disclosed in the 8th embodiment. The image acquisition unit 100, the image acquisition unit 100h, and the image acquisition unit 100i 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 100h and 100i may include the imaging lens system of the present disclosure and have a similar configuration to the image acquisition unit 100, the details of which are not repeated here.

[0175] The image acquisition unit 100 is a wide-angle image acquisition unit, the image acquisition unit 100h is a telephoto image acquisition unit, and the image acquisition unit 100i is an ultra-wide-angle image acquisition unit. In this embodiment, the image acquisition units 100, 100h, and 100i have different fields of view, so that the electronic device 400 can have different magnification ratios to meet the requirements of the optical zoom function. Furthermore, the image acquisition unit 100h can be a telephoto image acquisition unit with a light deflection element configuration, so that the overall path length of the image acquisition unit 100h is not limited by the thickness of the electronic device 400. Moreover, the light deflection element configuration of the image acquisition unit 100h can, for example, be one of those described in Fig. 25 to Fig. The structures shown in section 27 may be similar, for which reference is made to the preceding descriptions. Fig. 25 to Fig. Reference can be made to Section 27, and the details relating thereto are not repeated. In this embodiment, the electronic device 400 comprises several image acquisition units 100, 100h, and 100i, but the present disclosure is not limited to the number and arrangement of the image acquisition units. When a user takes pictures of an object, light rays are focused in the image acquisition unit 100, 100h, or 100i to produce images, and the flash module 401 is activated to assist the lighting. Furthermore, the subsequent processes are carried out in a similar manner to those in the embodiment described above, so the details relating thereto are not repeated. 12. Design

[0176] Fig. Figure 22 is a perspective view of an electronic device according to the 12th embodiment of the present disclosure.

[0177] In this embodiment, an electronic device 500 is a smartphone comprising the image acquisition unit 100, an image acquisition unit 100j, an image acquisition unit 100k, an image acquisition unit 100m, an image acquisition unit 100n, an image acquisition unit 100p, an image acquisition unit 100q, an image acquisition unit 100r, an image acquisition unit 100s, a flash module 501, a focusing aid module, an image signal processor, a display module and an image software processor (not shown) disclosed in the 8th embodiment. The image acquisition units 100, 100j, 100k, 100m, 100n, 100p, 100q, 100r and 100s are arranged on the same side of the electronic device 500, while the display module is arranged on the opposite side of the electronic device 500.Furthermore, each of the image acquisition units 100j, 100k, 100m, 100n, 100p, 100q, 100r and 100s can comprise the imaging lens system of the present disclosure and have a similar configuration to the image acquisition unit 100, without the details relating thereto being specified again.

[0178] The image acquisition unit 100 is a wide-angle image acquisition unit, the image acquisition unit 100j is a telephoto image acquisition unit, the image acquisition unit 100k is a telephoto image acquisition unit, the image acquisition unit 100m is a wide-angle image acquisition unit, the image acquisition unit 100n is an ultra-wide-angle image acquisition unit, the image acquisition unit 100p is an ultra-wide-angle image acquisition unit, the image acquisition unit 100q is a telephoto image acquisition unit, the image acquisition unit 100r is a telephoto image acquisition unit, and the image acquisition unit 100s is a ToF image acquisition unit. In this embodiment, the image acquisition units 100, 100j, 100k, 100m, 100n, 100p, 100q and 100r have different fields of view, so that the electronic device can have 500 different magnification ratios to meet the requirements of the optical zoom function.Furthermore, each of the 100j and 100k image acquisition units can be a telephoto image acquisition unit with a light deflection element configuration. In addition, the light deflection element configuration of each of the 100j and 100k image acquisition units can, for example, be one of those described in [reference missing]. Fig. 25 to Fig. The structures shown in section 27 may be similar, for which reference is made to the preceding descriptions. Fig. 25 to Fig.Reference can be made to Section 27, and the relevant details are not stated again. Furthermore, the image acquisition unit 100s can determine depth information of the imaged object. In this embodiment, the electronic device 500 comprises multiple image acquisition units 100, 100j, 100k, 100m, 100n, 100p, 100q, 100r, and 100s, but the present disclosure is not limited to the number and arrangement of the image acquisition units. When a user takes pictures of an object, the light rays are focused in the image acquisition unit 100, 100j, 100k, 100m, 100n, 100p, 100q, 100r, or 100s to produce images, and the flash module 501 is activated to provide additional light. Furthermore, the subsequent processes are carried out in a similar manner to those in the embodiments mentioned above, and the details thereof are not specified again.

[0179] The smartphone in its various embodiments serves only as an example to illustrate the image acquisition unit installed in an electronic device according to the present disclosure, and the present disclosure is not limited to it. The image acquisition unit can optionally be applied to optical systems with movable focus. Furthermore, the imaging lens system of the image acquisition unit is characterized by good aberration correction and high image quality and can be used for 3D image acquisition applications (three-dimensional image acquisition applications) in products such as digital cameras, mobile devices, digital tablets, smart televisions, network surveillance devices, dashboard cameras, vehicle reversing cameras, multi-camera devices, image recognition systems, motion sensor input devices, portable devices, and other electronic imaging devices.

[0180] The foregoing description has been provided for illustrative purposes with reference to specific embodiments. It should be noted that TABLES 1A-7C show different data for the various embodiments; however, the data for the different embodiments were obtained experimentally. The embodiments were selected and described to best illustrate the principles of the disclosure and their practical applications, so that other skilled persons may make the best possible use of the disclosure and of the various embodiments with different modifications suitable for their respective intended uses. The embodiments shown above and the accompanying drawings are exemplary and are not intended to be exhaustive, nor are they intended to limit the scope of this disclosure to the forms exactly disclosed. In view of the teachings above, many modifications and variations are possible.

Claims

[1] Imaging lens system comprising six lens elements (E1, E2, E3, E4, E5, E6), wherein the six lens elements (E1, E2, E3, E4, E5, E6) are arranged in the order from an object side to an image side along a beam 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) and a sixth lens element (E6), wherein each of the six lens elements (E1, E2, E3, E4, E5, E6) has an object-side surface facing the object side and an image-side surface facing the image side; wherein the first lens element (E1) has a positive refractive power, the second lens element (E2) has a positive refractive power, the image-side surface of the second lens element (E2) is convex in a paraxial region thereof, the third lens element (E3) has a negative refractive power, the object-side surface of the third lens element (E3) is concave in a paraxial region thereof, the image-side surface of the third lens element (E3) is convex in a paraxial region thereof, the fourth lens element (E4) has a negative refractive power, the fifth lens element (E5) has a positive refractive power, the object-side surface of the fifth lens element (E5) 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 sixth lens element (E6) has a negative refractive power,the object-side surface of the sixth lens element (E6) is convex in a paraxial region thereof, the image-side surface of the sixth lens element (E6) is concave in a paraxial region thereof, and the object-side surface of the sixth lens element (E6) has at least one inflection point (P). [2] Imaging lens system according to claim 1, wherein half of a maximum field of view of the imaging lens system is HFOV, an axial distance between the object-side surface of the first lens element (E1) and an image surface (IMG) is TL, a maximum image height of the imaging lens system is ImgH and the following conditions are met: 45 degrees <HFOV<55 Grad; and 1.10 <TL / ImgH<1,60. [3] Imaging lens system according to claim 1, wherein an axial distance between the object-side surface of the first lens element (E1) and an image surface (IMG) is TL, a radius of curvature of the image-side surface of the fourth lens element (E4) is R8 and the following condition is met: 0,0<|TL / R8|<1.

00. [4] Imaging lens system according to claim 1, wherein a focal length of the fifth lens element (E5) is f5, a focal length of the sixth lens element (E6) is f6 and the following condition is met: 0.20|f5 / f6|<0.

90. [5] Imaging lens system according to claim 1, wherein a radius of curvature of the object-side surface of the first lens element (E1) is R1, a radius of curvature of the object-side surface of the third lens element (E3) is R5 and the following condition is met: 0.00<|R5 / R1|<0.

60. [6] Imaging lens system according to claim 1, wherein an axial distance between the first lens element (E1) and the second lens element (E2) is T12, an axial distance between the second lens element (E2) and the third lens element (E3) is T23, an axial distance between the third lens element (E3) and the fourth lens element (E4) is T34, an axial distance between the fourth lens element (E4) and the fifth lens element (E5) is T45, an axial distance between the fifth lens element (E5) and the sixth lens element (E6) is T56 and the following condition is met: 3.00<(T12+T23) / (T34+T45+T56)<7.

50. [7] Imaging lens system according to claim 1, wherein a focal length of the imaging lens system f is, a radius of curvature of the object-side surface of the fifth lens element (E5) is R9, a radius of curvature of the image-side surface of the fifth lens element (E5) is R10 and the following condition is met: 2.00<|f / R9|+|f / R10|<5.

00. [8] Imaging lens system according to claim 1, wherein an Abbe number of the fourth lens element (E4) is V4, a focal length of the imaging lens system is f, a focal length of the fifth lens element (E5) is f5 and the following conditions are met: 35.0 <V4<65,0; and 0.10 <f / f5<3,00. [9] Image capture unit (100), comprising: the imaging lens system according to claim 1; and an image sensor (103) which is arranged on an image surface (IMG) of the imaging lens system. [10] Electronic device (200) comprising: the image acquisition unit (100) according to claim 9. [11] Imaging lens system comprising six lens elements (E1, E2, E3, E4, E5, E6), wherein the six lens elements (E1, E2, E3, E4, E5, E6) are arranged in the order from an object side to an image side along a beam 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) and a sixth lens element (E6), wherein each of the six lens elements (E1, E2, E3, E4, E5, E6) has an object-side surface facing the object side and an image-side surface facing the image side; wherein the first lens element (E1) has a positive refractive power, the second lens element (E2) has a positive refractive power, the image-side surface of the second lens element (E2) is convex in a paraxial region thereof, the third lens element (E3) has a negative refractive power, the object-side surface of the third lens element (E3) is concave in a paraxial region thereof, the image-side surface of the third lens element (E3) is convex in a paraxial region thereof, the fifth lens element (E5) has a positive refractive power, the object-side surface of the fifth lens element (E5) is convex in a paraxial region thereof, the sixth lens element (E6) has a negative refractive power, the object-side surface of the sixth lens element (E6) is convex in a paraxial region thereof,the image-side surface of the sixth lens element (E6) is concave in a paraxial region thereof and the object-side surface of the sixth lens element (E6) has at least one inflection point (P); where TL is an axial distance between the object-side surface of the first lens element (E1) and an image surface (IMG), R6 is a radius of curvature of the image-side surface of the third lens element (E3), R7 is a radius of curvature of the object-side surface of the fourth lens element (E4), R8 is a radius of curvature of the image-side surface of the fourth lens element (E4), and the following conditions are met: 0.00<|TL / R8|<1.20; and 0.00<|R6 / R7|<3.

00. [12] Imaging lens system according to claim 11, wherein the radius of curvature of the image-side surface of the third lens element (E3) is R6, the radius of curvature of the object-side surface of the fourth lens element (E4) is R7 and the following condition is met: 0.00<|R6 / R7|<1.

50. [13] Imaging lens system according to claim 11, wherein the axial distance between the object-side surface of the first lens element (E1) and the image surface (IMG) is TL, a focal length of the imaging lens system is f and the following condition is met: 1.45 <TL / f<1,80. [14] Imaging lens system according to claim 11, wherein a focal length of the first lens element (E1) is f1, a focal length of the fifth lens element (E5) is f5 and the following condition is met: 3.00<|f1 / f5|<5.

50. [15] Imaging lens system according to claim 11, wherein a focal length of the imaging lens system is f, 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 third lens element (E3) is f3, a focal length of the fourth lens element (E4) is f4, a focal length of the fifth lens element (E5) is f5, a focal length of the sixth lens element (E6) is f6 and the following condition is met: 1.10<|(f / f1+f / f2+f / f5) / (f / f3+f / f4+f / f6)|<1.

40. [16] Imaging lens system according to claim 11, wherein a focal length of the imaging lens system f is, a radius of curvature of the object-side surface of the third lens element (E3) is R5, the radius of curvature of the image-side surface of the third lens element (E3) is R6 and the following condition is met: 2.00<|f / R5|+|f / R6|<4.

00. [17] Imaging lens system according to claim 11, wherein an axial distance between the first lens element (E1) and the second lens element (E2) is T12, an axial distance between the second lens element (E2) and the third lens element (E3) is T23 and the following condition is met: 0.60 <T12 / T23<1,20. [18] Imaging lens system according to claim 11, wherein an axial distance between the third lens element (E3) and the fourth lens element (E4) T34 is a distance parallel to the optical axis between the position of the maximum effective radius of the image-side surface of the third lens element (E3) and the position of the maximum effective radius of the object-side surface of the fourth lens element (E4) ET34, and the following condition is met: 0.00 <T34 / ET34<0,10. [19] Imaging lens system comprising six lens elements (E1, E2, E3, E4, E5, E6), wherein the six lens elements (E1, E2, E3, E4, E5, E6) are arranged in the order from an object side to an image side along a beam 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) and a sixth lens element (E6), wherein each of the six lens elements (E1, E2, E3, E4, E5, E6) has an object-side surface facing the object side and an image-side surface facing the image side; wherein the first lens element (E1) has a positive refractive power, the second lens element (E2) has a positive refractive power, the image-side surface of the second lens element (E2) is convex in a paraxial region thereof, the third lens element (E3) has a negative refractive power, the object-side surface of the third lens element (E3) is concave in a paraxial region thereof, the image-side surface of the third lens element (E3) is convex in a paraxial region thereof, the fifth lens element (E5) has a positive refractive power, the object-side surface of the fifth lens element (E5) 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 sixth lens element (E6) has a negative refractive power, the object-side surface of the sixth lens element (E6) is convex in a paraxial region thereof,the image-side surface of the sixth lens element (E6) is concave in a paraxial region thereof and the object-side surface of the sixth lens element (E6) has at least one inflection point (P); where the radius of curvature of the image-side surface of the first lens element (E1) is R2, the radius of curvature of the object-side surface of the fifth lens element (E5) is R9, and the following condition is met: 0.00<|R9 / R2|<0.

70. [20] Imaging lens system according to claim 19, wherein the radius of curvature of the image-side surface of the first lens element (E1) is R2, the radius of curvature of the object-side surface of the fifth lens element (E5) is R9 and the following condition is met: 0.00<|R9 / R2|<0.

50. [21] Imaging lens system according to claim 19, wherein a central thickness of the first lens element (E1) is CT1, a central thickness of the second lens element (E2) is CT2 and the following condition is met: 0.20 <CT1 / CT2<1,20. [22] Imaging lens system according to claim 19, wherein a radius of curvature of the object-side surface of the first lens element (E1) is R1, a radius of curvature of the object-side surface of the sixth lens element (E6) is R11 and the following condition is met: 0.00<|R11 / R1|<0.

50. [23] Imaging lens system according to claim 19, wherein a focal length of the third lens element (E3) is f3, a focal length of the sixth lens element (E6) is f6 and the following condition is met: 0.60<|f3 / f6|<1.

60. [24] Imaging lens system according to claim 19, further comprising an aperture diaphragm (ST), wherein a composite focal length of the second lens element (E2), the third lens element (E3), the fourth lens element (E4), the fifth lens element (E5) and the sixth lens element (E6) is f23456, an axial distance between the aperture diaphragm (ST) and an image surface (IMG) SL is and the following condition is met: 0.80 <f23456 / SL<1,20. [25] Imaging lens system according to claim 19, wherein a central thickness of the first lens element (E1) is CT1, an axial distance between the first lens element (E1) and the second lens element (E2) is T12 and the following condition is met: 0.50 <CT1 / T12<1,40. [26] Imaging lens system according to claim 19, wherein a maximum effective radius of the object-side surface of the first lens element (E1) is Y1R1, a maximum effective radius of the image-side surface of the sixth lens element (E6) is Y6R2 and the following condition is met: 3.00 <Y6R2 / Y1R1<4,50. [27] Imaging lens system according to claim 19, wherein an axial distance between the object-side surface of the first lens element (E1) and an image surface (IMG) is TL, the radius of curvature of the image-side surface of the first lens element (E1) is R2, a radius of curvature of the image-side surface of the third lens element (E3) is R6, a radius of curvature of the object-side surface of the fourth lens element (E4) is R7, a radius of curvature of the image-side surface of the fourth lens element (E4) is R8, the radius of curvature of the object-side surface of the fifth lens element (E5) is R9 and the following conditions are met: 0.09≤|TL / R8|≤0.88; 0.002≤|R9 / R2|≤0.34; and 0.09≤|R6 / R7|≤1.04.

Images