Optical photography system, image acquisition unit and electronic device

Abstract

Optical photographic system comprising five lens elements (E1, E2, E3, E4, E5), wherein the five lens elements (E1, E2, E3, E4, E5) are arranged in the order from an object side to an image side along a ray path comprising a first lens element (E1), a second lens element (E2), a third lens element (E3), a fourth lens element (E4), and a fifth lens element (E5), and wherein each of the five lens elements (E1, E2, E3, E4, and E5) 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 object-side surface of the second lens element (E2) is concave in a paraxial region thereof, the fifth lens element (E5) has a negative refractive power and the image-side surface of the fifth lens element (E5) is concave in a paraxial region thereof; where an Abbe number of the second lens element (E2) is V2, an Abbe number of the third lens element (E3) is V3, an Abbe number of the fourth lens element (E4) is V4, and a central thickness of the fifth lens element (E5) is CT5, an axial distance between the third lens element (E3) and the fourth lens element (E4) is T34, a focal length of the optical recording system is f, a focal length of the second lens element (E2) is f2, a focal length of the third lens element (E3) is f3, a focal length of the fourth lens element (E4) is f4, and the following conditions are met: 40.0 < V 2 + V 3 + V 4 < 80.0 ; 0.00 < CT 5 / T 34 < 1.00 ; and 0.00 < | f / f2 | + | f / f3 | + | f / f4 | < 1.00.

Description

BACKGROUND Technical area

[0001] The present disclosure relates to an optical photography system, an image acquisition unit and an electronic device, in particular an optical photography system and an image acquisition unit applicable to an electronic device. Description of the relevant state of the art

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

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

[0004] According to one aspect of the present disclosure, an optical photography system comprises five lens elements. These five lens elements, arranged in order from the object side to an image side along a ray path, are a first lens element, a second lens element, a third lens element, a fourth lens element, and a fifth lens element. Each of the five lens elements has an object-side surface 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 object-side surface of the second lens element is concave in a paraxial region. Preferably, the fifth lens element has a negative refractive power. Preferably, the image-side surface of the fifth lens element is concave in a paraxial region.

[0006] If the Abbe number of the second lens element is V2, the Abbe number of the third lens element is V3, the Abbe number of the fourth lens element is V4, the central thickness of the fifth lens element is CT5, the axial distance between the third and fourth lens elements is T34, the focal length of the optical photography system is f, the focal length of the second lens element is f2, the focal length of the third lens element is f3, and the focal length of the fourth lens element is f4, then the following conditions are preferably met: 40.0 <V2+V3+V4<80,0; 0.00 <CT5 / T34<1,00; and 0.00<|f / f2|+|f / f3|+|f / f4|<1.00.

[0007] According to another aspect of the present disclosure, an optical photographic system comprises five lens elements. These five lens elements, arranged in order from the object side to an image side along a ray path, are a first lens element, a second lens element, a third lens element, a fourth lens element, and a fifth lens element. Each of the five lens elements has an object-side surface facing the object side and an image-side surface facing the image side.

[0008] Preferably, the first 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 image-side surface of the third lens element is convex in a paraxial region. Preferably, the object-side surface of the fifth lens element is convex in a paraxial region. Preferably, the object-side surface of the fifth lens element has at least one inflection point.

[0009] If an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, an Abbe number of the fourth lens element is V4, a central thickness of the fifth lens element is CT5, an axial distance between the first lens element and the second lens element is T12, an axial distance between the third lens element and the fourth lens element is T34, and an axial distance between the fourth lens element and the fifth lens element is T45, then the following conditions are preferably met: 30.0 <V2+V3+V4<90,0; 0.00 <CT5 / T34<1,00; and 0.00 <T12 / T45<0,70.

[0010] According to another aspect of the preceding disclosure, an image acquisition unit comprises one of the aforementioned optical photography systems and an image sensor, wherein the image sensor is arranged on an image surface of the optical photography system.

[0011] According to another aspect of the present disclosure, an electronic device includes the aforementioned image capture unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The disclosure can be better understood by reading the following detailed description of the embodiments, with reference to the accompanying drawings as follows: Fig. Figure 1 shows 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 shows 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 shows a schematic view of an image acquisition unit according to the third 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 third embodiment; Fig. Figure 7 shows a schematic view of an image acquisition unit according to the fourth 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 fourth embodiment; Fig. Figure 9 shows a schematic view of an image acquisition unit according to the fifth 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 fifth embodiment; Fig. Figure 11 shows a schematic view of an image acquisition unit according to the sixth 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 sixth embodiment; Fig. Figure 13 shows a schematic view of an image acquisition unit according to the seventh 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 seventh embodiment; Fig. Figure 15 shows a schematic view of an image acquisition unit according to the eighth embodiment of the present disclosure; Fig.Figure 16 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the eighth embodiment; Fig. Figure 17 shows a perspective view of an image acquisition unit according to the ninth embodiment presented in the disclosure; Fig. Figure 18 shows a perspective view of an electronic device according to the tenth embodiment presented in the disclosure; Fig. Figure 19 shows a different perspective view of the electronic device in Fig. 18; Fig. Figure 20 shows a perspective view of an electronic device according to the eleventh embodiment presented in the disclosure; Fig. Figure 21 shows a different perspective view of the electronic device in Fig. 20; Fig. 22 shows a block diagram of the electronic device in Fig. 20; Fig.Figure 23 shows a perspective view of an electronic device according to the twelfth embodiment presented in the disclosure; Fig. Figure 24 shows a perspective view of an electronic device according to the thirteenth embodiment presented in the disclosure; Fig. Figure 25 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 26 shows a schematic view of Y3R2 and Y5R2 according to the first embodiment of the present disclosure; Fig. Figure 27 shows a schematic view of a configuration of a light deflection element in an optical photography system according to an embodiment of the present disclosure; Fig.Figure 28 shows a schematic view of another configuration of a light deflection element in an optical photography system according to an embodiment of the present disclosure; and Fig. Figure 29 shows a schematic view of a configuration of two light deflection elements in an optical photography system according to an embodiment of the present disclosure; DETAILED DESCRIPTION

[0013] An optical photographic system has five lens elements. These five lens elements, in order from the object side to the image side along a light path, are a first lens element, a second lens element, a third lens element, a fourth lens element, and a fifth lens element. Each of the five lens elements has an object-side surface facing the object side and an image-side surface facing the image side.

[0014] The first lens element can have a positive refractive power. This is advantageous for reducing the size of the optical photography system and improving its light convergence capability. The object-side surface of the first lens element can be convex in a paraxial region. This is advantageous for adjusting the refractive power and viewing angle of the first lens element. The image-side surface of the first lens element can be concave in a paraxial region. This is advantageous for adjusting the refractive power of the first lens element and simultaneously facilitating casting, thereby increasing manufacturing yield.

[0015] The object-side surface of the second lens element can be concave in a paraxial region. This is advantageous for adjusting the refractive power of the second lens element, thereby correcting the spherical aberration of the optical photography system. The image-side surface of the second lens element can be convex in a paraxial region. This is also advantageous for correcting aberrations of the optical photography system, thus balancing the image quality between the central and peripheral images.

[0016] The image-side surface of the third lens element can be convex in a paraxial region. Therefore, it is advantageous to adjust its light emission direction to prevent total internal reflection.

[0017] The fifth lens element can have a negative refractive power. Therefore, it is advantageous for compensating for the refractive power distribution of the optical photography system and correcting the spherical aberration of the optical imaging system. The object-side surface of the fifth lens element can be convex in a paraxial region. Therefore, it is advantageous for adjusting the lens shape of the fifth lens element, thereby correcting off-axis field curvature. The image-side surface of the fifth lens element can be concave in a paraxial region. Therefore, it is advantageous for adjusting the lens shape of the fifth lens element, thereby reducing the flange focal distance and correcting aberrations.

[0018] According to the present disclosure, the object-side surface of the fifth lens element can furthermore have at least one inflection point. Therefore, it is advantageous for correcting aberrations at the image edge while simultaneously reducing the overall size. It is applied to Fig.Reference is made to Figure 25, which shows a schematic view of inflection points P on the object-side surface of the fifth lens element E5 according to the first embodiment of the present disclosure. The aforementioned inflection points P on the object-side surface of the fifth lens element E5, 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 image-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, and the image-side surface of the fifth lens element E5 in Fig. Figure 25 are examples. Each of the lens surfaces in different embodiments of the present disclosure may also have one or more inflection points.

[0019] According to the present disclosure, the image-side surface of the fifth lens element can have at least one critical point in a region of the same offset from the axis. Therefore, it is advantageous for correcting field curvature and distortion of the optical photography system while simultaneously reducing the overall track length of the optical photography system. It is applied to Fig.Reference is made to Figure 25, which shows a schematic view of critical points C on the image-side surface of the fifth lens element E5 according to the first embodiment of the present disclosure. The aforementioned critical points C on the image-side surface of the fifth lens element E5, as well as the 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 image-side surface of the second lens element E2, the object-side surface of the third lens element E3, the object-side surface of the fourth lens element, the image-side surface of the fourth lens element E4, and the object-side surface of the fifth lens element E5 in Fig. Figure 25 are examples. Each of the lens surfaces in various embodiments of the present disclosure may also have one or more critical points in a region of the same that is offset from the axis.

[0020] According to the present disclosure, the axial distance between the third lens element and the fourth lens element can be the maximum value among the axial distances between any of all adjacent lens elements of the optical imaging system. Therefore, it is advantageous to have a suitable distance between the third and fourth lens elements, thereby correcting off-axis aberrations.

[0021] If the Abbe number of the second lens element is V2, the Abbe number of the third lens element is V3, and the Abbe number of the fourth lens element is V4, the following condition can be satisfied: 30.0 < V2+V3+V4 < 100.0. Therefore, it is advantageous to adjust the distribution of the lens material and correct the color differences produced by the overall system, thereby preventing overlapping images and improving image quality. Furthermore, the following conditions can also be satisfied: 30.0 < V2+V3+V4 < 90.0. Furthermore, the following conditions can also be satisfied: 35.0 < V2+V3+V4 < 85.0. Furthermore, the following conditions can also be satisfied: 40.0 < V2+V3+V4 < 80.0. Furthermore, the following condition can also be satisfied: 48.9 ≤ V2+V3+V4 ≤ 76.4.

[0022] If the central thickness of the fifth lens element is CT5 and the axial distance between the third and fourth lens elements is T34, the following condition can be met: 0.00 < CT5 / T34 < 1.00. Therefore, it is advantageous to adjust the lens configuration on the image side of the optical photography system to improve space utilization and prevent inefficient space use. Furthermore, the following conditions can also be met: 0.20 < CT5 / T34 < 1.00. Additionally, the following conditions can also be met: 0.40 < CT5 / T34 < 0.95. Furthermore, the following condition can also be met: 0.46 ≤ CT5 / T34 ≤ 0.90.

[0023] If the focal length of the photographic optical system is f, the focal length of the second lens element is f2, the focal length of the third lens element is f3, and the focal length of the fourth lens element is f4, the following condition can be satisfied: 0.00 < |f / f2|+|f / f3|+|f / f4| < 1.00. Therefore, it is advantageous to provide several corrective lenses for the photographic optical system to correct aberrations at the image edge. Furthermore, the following condition can also be satisfied: 0.00 < |f / f2|+|f / f3|+|f / f4| < 0.90. Additionally, the following condition can also be satisfied: 0.10 < |f / f2|+|f / f3|+|f / f4| < 0.80. Furthermore, the following condition can also be met: 0.20 ≤ |f / f2|+|f / f3|+|f / f4| ≤ 0.72.

[0024] If the axial distance between the first and second lens elements is T12, and the axial distance between the fourth and fifth lens elements is T45, the following condition can be met: 0.00 < T12 / T45 < 0.70. Therefore, it is advantageous to reduce the size at the object end of the optical photography system, avoid an excessive effective radius of the first lens element, and thus allow the optical photography system to have a small head size. Furthermore, the following conditions can also be met: 0.10 < T12 / T45 < 0.60. Additionally, the following conditions can also be met: 0.15 < T12 / T45 < 0.50. Furthermore, the following condition can also be met: 0.20 ≤ T12 / T45 ≤ 0.40.

[0025] If the maximum image height of the optical photography system (which can be half the diagonal length of an effective light-sensitive area of ​​the image sensor) is ImgH and the focal length of the optical photography system is f, the following condition can be met: 0.90 < ImgH / f < 1.20. Therefore, it is advantageous to control the field of view of the optical photography system to extend the product's application range. Furthermore, the following condition can also be met: 0.95 < ImgH / f < 1.10.

[0026] If the axial distance between the object-side surface of the first lens element and the image-side surface of the third lens element is Dr1r6, and the axial distance between the image-side surface of the third lens element and the image-side surface of the fifth lens element is Dr6r10, the following condition can be met: 0.20 < Dr1r6 / Dr6r10 < 1.00. Therefore, it is advantageous to balance the dimensions on both the object and image sides of the optical photography system, thus reducing assembly difficulties. Furthermore, the following condition can also be met: 0.40 < Dr1r6 / Dr6r10 < 1.00. Additionally, the following condition can also be met: 0.60 < Dr1r6 / Dr6r10 < 0.90.

[0027] If the radius of curvature of the image-side surface of the first lens element is R2 and the radius of curvature of the image-side surface of the second lens element is R4, the following condition can be satisfied: 0.00 < |R2 / R4| < 1.00. Therefore, it is advantageous to adjust the direction of light propagation and thereby increase the viewing angle. Furthermore, the following condition can also be satisfied: 0.10<|R2 / R4|<0.90.

[0028] If the radius of curvature of the image-side surface of the second lens element is R4 and the radius of curvature of the object-side surface of the third lens element is R5, the following condition can be met: -0.10 < (R4-R5) / (R4+R5) < 12.00. This is advantageous for adjusting the direction of light propagation and reducing stray light. Furthermore, the following condition can also be met: -0.50 ≤ (R4-R5) / (R4+R5) < 10.00. Additionally, the following condition can also be met: 0.00 < (R4-R5) / (R4+R5) < 1.00.

[0029] 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 object-side surface of the fourth lens element is R7, the following condition can be satisfied: -0.30 < TL / R7 < 1.40. Therefore, it is advantageous to adjust the ratio of the total track length of the optical photography system to the radius of curvature of the object-side surface of the fourth lens element, thus facilitating adjustments to the lens shape and refractive power of the fourth lens element, thereby improving image quality in the central image. Furthermore, the following conditions can also be satisfied: -0.25 < TL / R7 < 1.30. Additionally, the following condition can also be satisfied: -0.20 < TL / R7 < 1.20.

[0030] If the axial distance between the image-side surface of the fifth lens element and the image surface is BL, and the axial distance between the third and fourth lens elements is T34, the following condition can be met: 0.40 < BL / T34 < 2.00. Therefore, it is advantageous to adjust the ratio between the flange focal distance of the optical photography system and the distance between the third and fourth lens elements to facilitate a reduction in the flange focal distance, thereby reducing the size of the optical photography system and resulting in a miniaturized optical lens. Furthermore, the following conditions can also be met: 0.60 < BL / T34 < 1.80. Additionally, the following conditions can also be met: 0.80 < BL / T34 < 1.70. Furthermore, the following condition can also be met: 1.00 < BL / T34 ≤ 1.60.

[0031] If the central thickness of the fourth lens element is CT4 and the central thickness of the fifth lens element is CT5, the following condition can be met: 0.40 < CT4 / CT5 < 1.40. Therefore, it is advantageous to balance the central thickness ratio of the fourth and fifth lens elements, thereby reducing manufacturing tolerances and improving yield. Furthermore, the following conditions can also be met: 0.50 < CT4 / CT5 < 1.20. Additionally, the following condition can also be met: 0.55 < CT4 / CT5 < 1.10.

[0032] If the axial distance between the object-side surface of the first lens element and the image area is TL, and the maximum image height of the optical photography system is ImgH, the following condition can be met: 0.80 < TL / ImgH < 1.30. Therefore, it is advantageous for the optical photography system to achieve a balance between reducing the overall path length and increasing the image area. It should be noted that the smaller the value of TL / ImgH, the more advantageous it is for miniaturizing the optical lens, resulting in products using the optical photography system having a smaller size and a thinner profile. Furthermore, the following conditions can also be met: 0.95 < TL / ImgH < 1.25. Additionally, the following condition can also be met: 1.10 < TL / ImgH < 1.20.

[0033] If the maximum effective radius of the image-side surface of the third lens element is Y3R2 and the maximum effective radius of the image-side surface of the fifth lens element is Y5R2, the following condition can be met: 2.00 < Y5R2 / Y3R2 < 4.50. Therefore, it is advantageous to adjust the ratio of the effective radius of the image-side surface of the fifth lens element to the effective radius of the image-side surface of the third lens element. This facilitates an increase in the image area as well as a reduction in size at the object end of the optical photography system, thus increasing the screen-to-body ratio of electronic devices equipped with the optical photography system. Furthermore, the following condition can also be met: 2.50 < Y5R2 / Y3R2 < 3.50. It will be shown on Fig.Reference is made to Figure 26, which shows a schematic view of Y3R2 and Y5R2 according to the first embodiment of the present disclosure.

[0034] If the axial distance between the object-side surface of the first lens element and the 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 met: -0.20 < TL / R8 < 1.30. Therefore, it is advantageous to adjust the ratio of the total track length of the optical photographic system to the radius of curvature of the image-side surface of the fourth lens element, thereby adapting the lens shape and refractive power of the fourth lens element to correct aberrations. Furthermore, the following condition can also be met: -0.15 < TL / R8 < 1.20.

[0035] If the focal length of the third lens element is f3 and the focal length of the fifth lens element is f5, the following condition can be satisfied: 0.00 ≤ |f5 / f3| < 1.00. Therefore, it is advantageous to balance the refractive power of the fifth and third lens elements, thus adjusting the refractive power configuration at the image end of the optical photography system and simultaneously correcting field curvature. Furthermore, the following condition can also be satisfied: 0.00 ≤ |f5 / f3| < 0.85. Additionally, the following condition can also be satisfied: 0.00 ≤ |f5 / f3| < 0.75.

[0036] If the focal length of the optical photography system is f, the focal length of the third lens element is f3, and the combined focal length of the third and fourth lens elements is f34, the following condition can be met: -0.50 < f / f34 < 0.40. Therefore, it is advantageous to adjust the refractive power of the third and fourth lens elements to balance light convergence and divergence, thereby improving the convergence quality of all fields of view. Furthermore, the following condition can also be met: -0.40 < f / f34 < 0.30.

[0037] If the focal length of the first lens element is f1 and the focal length of the second lens element is f2, the following condition can be satisfied: 0.00 < |f1 / f2| < 1.00. Therefore, it is advantageous to combine the refractive powers of the first and second lens elements to correct aberrations. Furthermore, the following condition can also be satisfied: 0.00 < |f1 / f2| < 0.70. Additionally, the following condition can also be satisfied: 0.00<|f1 / f2|<0.50.

[0038] If the radius of curvature of the object-side surface of the fourth lens element is R7 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 / R7| < 1.10. Therefore, it is advantageous to match the lens shapes and refractive power of the fifth and fourth lens elements to correct coma and improve light convergence qualities both near and off-axis. Furthermore, the following condition can also be satisfied: 0.00 < |R9 / R7| < 0.90.

[0039] If the radius of curvature of the object-side surface of the second lens element is R3 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 < |R3 / R5| < 1.10. Therefore, it is advantageous to control the light deflection angle in the optical photography system to reduce the generation of stray light. Furthermore, the following condition can also be satisfied: 0.10 < |R3 / R5| < 1.00.

[0040] According to the present disclosure, the aforementioned features and conditions can be used in numerous combinations to achieve corresponding effects.

[0041] According to the present disclosure, the lens elements of the optical photography system can be made of either glass or plastic. If the lens elements are made of glass, the refractive power distribution of the optical photography system can be more flexible, and the influence of external ambient temperature changes on the imaging can be reduced. The glass lens element can be manufactured either by grinding or forming. If the lens elements are made of plastic, the manufacturing costs can be effectively reduced. Furthermore, the surfaces of each lens element can be spherical or aspherical. Spherical lens elements are simple to manufacture.An aspherical lens element design allows for more control variables to eliminate aberrations and reduce the required number of lens elements, thus effectively shortening the overall track length of the optical photography system. Furthermore, the aspherical surfaces can be formed by plastic injection molding or glass molding.

[0042] According to the present disclosure, if a lens surface is aspherical, this means that the lens surface has an aspherical shape over its entire optically effective area or one or more regions thereof.

[0043] According to the present disclosure, one or more materials of the lens element can optionally contain an additive to reduce unwanted scattered light or color deviations. This additive generates light absorption and interference effects and modifies the transmittance of the lens element in a specific wavelength range. For example, the additive can optionally filter out light in the wavelength range of 600 nm to 800 nm to reduce excessive red and / or near-infrared light; or it can optionally filter out light in the wavelength range of 350 nm to 450 nm to reduce excessive blue and near-ultraviolet light, in each case preventing interference with the final image. The additive can be homogeneously mixed with a plastic material for use in the production of a lens element from the mixed material by injection molding. Furthermore, the additive can be applied to the lens surfaces to achieve the aforementioned effects.

[0044] According to the present disclosure, each object-side surface and image-side surface has a paraxial region and an offset-from-the-axis region. The paraxial region refers to the area of ​​the surface in which light rays travel near the optical axis, and the offset-from-the-axis region refers to the area of ​​the surface that is away from the paraxial region. Unless otherwise specified, in particular if the lens element has a convex surface, this means that the surface in its paraxial region is convex; if the lens element has a concave surface, this means that the surface in its paraxial region is concave.Furthermore, if a region of refractive power, radius of curvature, or focal point of a lens element is not defined, this means that the region of refractive power, radius of curvature, or focal point of the lens element lies in its paraxial region.

[0045] 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.

[0046] According to the present disclosure, the image surface of the optical photography system, based on the corresponding image sensor, can be flat or curved, in particular a curved surface that is concave in the direction of the object side of the optical photography system.

[0047] According to the present disclosure, an image correction unit, such as an image field plane, can optionally be arranged between the lens element closest to the image side of the optical photography system along the beam path and the image surface to correct aberrations such as field curvature. The optical properties of the image correction unit, such as curvature, thickness, refractive index, position, and surface shape (convex or concave surface with spherical, aspherical, diffractive, or Fresnel types), can be adapted according to the design of the image acquisition unit. In general, for example, a preferred image correction unit is a thin transparent element with a concave object-side surface and a planar image-side surface, and the thin transparent element is arranged near the image surface.

[0048] According to the present disclosure, at least one light deflection 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 the image surface on the imaging beam path, so that the optical photography system can be more flexible in its spatial arrangement, and therefore the dimensions of an electronic device are not limited by the total track length of the optical photography system. It is particularly emphasized that Fig. 27 and Fig. 28 referred. Fig. Figure 27 shows a schematic view of a configuration of a light deflection element in an optical photography system according to an embodiment of the present disclosure, and Fig.Figure 28 shows a schematic view of another configuration of a light deflection element in an optical photography system according to an embodiment of the present disclosure. Fig. 27 and Fig. 28. The optical photographing system can have, in the sequence from an imaged object (not shown in the figures) to an image surface IM along a beam path, a first optical axis OA1, a light deflecting element LF, and a second optical axis OA2. The light deflecting element LF can be positioned between the imaged object and a lens group LG of the optical photographing system as shown in Fig. 27 shown arranged, or can be arranged between a lens group LG the optical photographic system and the image area IMG as in Fig. 28 are shown arranged. In addition, it will be shown on Fig.Reference is made to figure 29, which shows a schematic view of a configuration of two light deflection elements in an optical photography system according to an embodiment of the present disclosure. Fig. 29 The optical photography 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 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 optical photography system, the second light deflection element LF2 is arranged between the lens group LG of the optical photography system and the image surface IMG, and the direction of light travel in the first optical axis OA1 can be the same as the direction of light travel in the third optical axis OA3, as shown in Fig.29 shown. The optical photography system can optionally be equipped with three or more light deflection elements, and the present disclosure is not limited to the type, quantity and position of the light deflection elements of the embodiments disclosed in the preceding figures.

[0049] According to the present disclosure, the optical photographic system can have at least one aperture, such as an aperture diaphragm, a Lyot diaphragm, or a field diaphragm. The Lyot diaphragm or field diaphragm is adjusted to eliminate stray light and thereby improve image quality.

[0050] According to the present disclosure, an aperture diaphragm can be configured as a front diaphragm or a middle diaphragm. A front diaphragm, arranged between an imaged object and the first lens element, can provide a longer distance between the exit pupil of the optical photography system and the image plane to create a telecentric effect, thereby improving the image acquisition efficiency of an image sensor (e.g., CCD or CMOS). A middle diaphragm, arranged between the first lens element and the image plane, is advantageous for increasing the angle of view of the optical photography system, thus providing a wider field of view. According to the present disclosure, the optical photography system can include an aperture control unit.The aperture control unit can be a mechanical component or a light modulator that controls the size and shape of the aperture by means of electricity or electrical signals. The mechanical component can include a movable element, such as a louvered assembly or a light-shielding strip. 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 enhance the ability to adjust image quality. Furthermore, the aperture control unit can be the aperture diaphragm of this disclosure, which changes the f-number to achieve various image effects, such as depth of field or light intensity.

[0051] According to the present disclosure, the optical photography system may comprise one or more optical elements to limit the shape of the light passing through the optical photography system. Each optical element may be, but is not limited to, a filter, a polarizer, etc., and each optical element may be, but is not limited to, a single-piece element, a composite component, a thin film, etc. The optical element may be located on the object side or the image side of the optical photography system, or between any two adjacent lens elements, to transmit light in a specific shape and thus meet the requirements of the application.

[0052] According to the present disclosure, the optical photography system can comprise at least one optical lens element, an optical element, or a support, which has at least one surface with a low-reflection layer. The low-reflection layer can effectively reduce stray light caused by light reflection at the interface. The low-reflection layer can be arranged in an optically inactive region of an object-side or image-side surface of the optical lens element or of a connecting surface between the object-side surface and the image-side surface. 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-path folding element, a prime, a mirror, etc.The carrier can be a base for supporting a lens arrangement, a microlens mounted on an image sensor, a substrate surrounding the image sensor, a glass plate to protect the image sensor, etc.

[0053] According to the present disclosure, the optical photography 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. This is advantageous for coordinating with the shape of the non-circular lens elements or the aperture diaphragm in order to effectively save space and fully utilize the light passing through the non-circular lens element or the aperture diaphragm, thereby reducing stray light. In addition, the light-blocking element can be provided with a corrugated or serrated structure on the circumference of an inner aperture region thereof.

[0054] 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 folded by a light deflection element, the axial optical data are also calculated along the folded optical axis.

[0055] In accordance with the above description of the present disclosure, the following specific embodiments are provided for further explanation. First embodiment

[0056] Fig. Figure 1 shows 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.In Figure 1, the image acquisition unit comprises the optical photography system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical photography system comprises, in order from an object side to an image side along an optical axis, an aperture diaphragm ST, a first lens element E1, a second lens element E2, an aperture S1, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a filter E6, and an image area IMG. The optical photography system comprises five lens elements (E1, E2, E3, E4, and E5), with no additional lens elements arranged between any of the adjacent five lens elements.

[0057] 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 a 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 a region offset from the axis.

[0058] The second lens element E2, 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 second lens element E2 is made of a plastic material and has both aspherical object-side and image-side surfaces. 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 a region offset from the axis. The image-side surface of the second lens element E2 has a critical point in a region offset from the axis.

[0059] The third lens element E3, 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 third lens element E3 is made of a plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the third lens element E3 has two inflection points. The image-side surface of the third lens element E3 has one inflection point. The object-side surface of the third lens element E3 has a critical point in a region offset from the axis.

[0060] 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 a plastic material and has both aspherical object-side and image-side surfaces. 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 a critical point in a region offset from the axis. The image-side surface of the fourth lens element E4 has a critical point in a region offset from the axis.

[0061] The fifth lens element E5, 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 fifth lens element E5 is made of a plastic material and has both aspherical object-side and image-side surfaces. The object-side surface of the fifth lens element E5 has two inflection points. The image-side surface of the fifth lens element E5 has two inflection points. The object-side surface of the fifth lens element E5 has two critical points in a region offset from the axis. The image-side surface of the fifth lens element E5 has one critical point in a region offset from the axis.

[0062] The E6 filter is made of glass and is located between the fifth lens element E5 and the image area IMG, and does not affect the focal length of the optical photography system. The IS image sensor is located on or near the image area IMG of the optical photography system.

[0063] The equation of the aspherical surface profiles of the aforementioned lens elements of the first embodiment is expressed as follows: X(Y)=(Y2 / R) / (1+sqrt(1−(1+k)×(Y / R)2))+∑i(Ai)×(Yi) where X is the displacement parallel to an optical axis from an axial vertex on the aspherical surface to a point at a distance Y from the optical axis on the aspherical surface; Y is the vertical distance from the point on the aspherical surface to the optical axis; R is the radius of curvature; k is the conic coefficient; and A is the i-th aspherical coefficient, and in this embodiment i can be 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28 and 30, but is not limited to that.

[0064] In the optical photography system of the image acquisition unit 1 according to the first embodiment, if a focal length of the optical imaging system is f, an aperture number of the optical photography system is Fno, and half of a maximum field of view of the optical photography system is HFOV, these parameters have the following values: f = 2.26 millimeters (mm), Fno = 2.23, and HFOV = 43.3 degrees.

[0065] If the maximum field of view of the optical photography system is FOV, then the following condition is met: FOV = 86.6 degrees.

[0066] If the axial distance between the object-side surface of the first lens element E1 and the image surface IMG TL is and the maximum image height of the optical photography system is ImgH, then the following condition is met: TL / ImgH = 1.15.

[0067] If the maximum image height of the optical photography system is ImgH and the focal length of the optical photography system is f, then the following condition is met: ImgH / f = 1.02.

[0068] If the axial distance between the object-side surface of the fifth lens element E4 and the image surface IMG TL is and a radius of curvature of the object-side surface of the fourth lens element E4 is R7, the following condition is met: TL / R7=0.42.

[0069] If the axial distance between the object-side surface of the fifth lens element E4 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, then the following condition is met: TL / R8 = 0.68.

[0070] If the axial distance between the image-side surface of the fifth lens element E5 and the image surface IMG is BL, and the axial distance between the third lens element E3 and the fourth lens element E4 is T34, then the following condition is met: BL / T34 = 1.40. In this embodiment, an axial distance between two adjacent lens elements is a distance in a paraxial region between two adjacent lens surfaces of two adjacent lens elements.

[0071] If the focal length of the optical photography system is f, a focal length of the second lens element E2 is f2, a focal length of the third lens element E3 is f3, and a focal length of the fourth lens element E4 is f4, then the following condition is satisfied: |f / f2|+|f / f3|+|f / f4| = 0.72.

[0072] If the focal length of the first lens element E1 is f1 and the focal length of the second lens element E2 is f2, then the following condition is satisfied: |f1 / f2| = 0.34.

[0073] If the focal length of the third lens element E3 is f3 and the focal length of the fifth lens element E5 is f5, then the following condition is met: |f3 / f5| = 0.67.

[0074] If the focal length of the optical photography system is f, and a combined focal length of the third lens element E3 and the fourth lens element E4 is f34, then the following condition is met: f / f34 = 0.05.

[0075] 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 image-side surface of the second lens element E2 is R4, then the following condition is satisfied: |R2 / R4| = 0.20.

[0076] If the radius of curvature of the object-side surface of the second lens element E2 is R3 and the radius of curvature of the object-side surface of the third lens element E3 is R5, then the following condition is satisfied: |R3 / R5| = 0.21.

[0077] If the radius of curvature of the object-side surface of the fourth lens element E4 is R7 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 / R7| = 0.18.

[0078] If the radius of curvature of the image-side surface of the second lens element E2 is R4 and the radius of curvature of the object-side surface of the third lens element E3 is R5, then the following condition is met: (R4-R5) / (R4+R5) = 9.77.

[0079] If the central thickness of the fourth lens element E4 is CT4 and the central thickness of the fifth lens element E5 is CT5, then the following condition is met: CT4 / CT5=0.67.

[0080] If the central thickness of the fifth lens element E5 is CT5 and the axial distance between the third lens element E3 and the fourth lens element E4 is T34, then the following condition is met: CT5 / T34 = 0.78.

[0081] If the axial distance between the first lens element E1 and the second lens element E2 is T12, and the axial distance between the fourth lens element E4 and the fifth lens element E5 is T45, then the following condition is met: T12 / T45 = 0.29.

[0082] If the axial distance between the object-side surface of the first lens element E1 and the image-side surface of the third lens element E3 is Dr1r6, and the axial distance between the image-side surface of the third lens element E3 and the image-side surface of the fifth lens element E5 is Dr6r10, then the following condition is satisfied: Dr1r6 / Dr6r10 = 0.72.

[0083] If the Abbe number of the second lens element E2 is V2, the Abbe number of the third lens element E3 is V3, and the Abbe number of the fourth lens element E4 is V4, then the following condition is satisfied: V2+V3+V4 = 68.4.

[0084] If the maximum effective radius of the image-side surface of the third lens element is E3 Y3R2 and the maximum effective radius of the image-side surface of the fifth lens element is E5 Y5R2, then the following condition is satisfied: Y5R2 / Y3R2=2.85.

[0085] The detailed optical data of the first embodiment are shown in Table 1A and the data of the aspherical surface are shown in Table 1B. Table 1A first embodiment f = 2.26 mm, Fno = 2.23, HFOV = 43.3 degrees Area # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture stop plan -0,140 2 Lens 1 0,7905 (ASP) 0,325 plastic 1,534 56,0 1,84 3 3,4452 (ASP) 0,066 4 Lens 2 -2,9342 (ASP) 0,160 plastic 1,661 20,3 -5,36 5 -17,5439 (ASP) 0,042 6 Aperture plan 0,075 7 Lens 3 14,2857 (ASP) 0,188 plastic 1,614 25,6 13,28 8 -18,8679 (ASP) 0,420 9 Lens 4 6,2173 (ASP) 0,220 plastic 1,642 22,5 -16,95 10 3,9015 (ASP) 0,225 11 Lens 5 1,1475 (ASP) 0,329 plastic 1,562 44,6 -8,92 12 0,8374 (ASP) 0,200 13 filter plan 0,210 Glass 1,517 64,2 - 14 plan 0,178 15 Picture plan - Note: Reference wavelength is 587.6 nm (d-line). The effective radius of aperture S1 (area 6) is 0.425 mm. Table 1B aspheric coefficients Area # 2 3 4 5 k = -2,53169E+00 -9,04342E+01 2,42048E+01 3,43005E+01 A4 = 5,405224321E-01 -1,137224601E-01 1,677983846E-01 5,929512525E-01 A6 = 2,303808119E+00 -2,778742423E+00 3,911543631E+00 -1,256756779E+01 A8 = -6,606598177E+01 3,224740443E+01 4,586536587E+01 5,909902529E+02 A10 = 9,379898868E+02 -4,715528422E+02 6,154196019E+02 -1,330951849E+04 A12 = -8,363248217E+03 4,715996712E+03 4,611422189E+03 1,910082563E+05 A14 = 4,660621421E+04 -3,034371283E+04 1,579545700E+04 -1,793044243E+06 A16 = -1,585870259E+05 1,203122171E+05 1,553163795E+04 1,096887027E+07 A18 = 2,990569120E+05 -2,656660507E+05 3,234112221E+05 -4,212043195E+07 A20 = -2,392579959E+05 2,487641875E+05 1,032198437E+06 9,217015599E+07 A22 = - - 1,131850674E+06 -8,763220064E+07 Area # 7 8 9 10 k = 2,98371E+01 -9,06585E+01 2,27933E+01 -9,90000E+01 A4 = -8,337878018E-01 -5,750122473E-01 -2,059250148E-01 -3,606537741E-01 A6 = 2,293927636E+00 2,398299892E-01 3,670230096E+00 -2,429027281E-01 A8 = -1,999550095E+01 2,875877619E-01 6,548664529E+01 1,885911368E+01 A10 = 1,138525335E+02 -1,011542724E+01 6,456687431E+02 -1,682129337E+02 A12 = -3,504322280E+02 5,228970673E+01 3,896597826E+03 8,247293934E+02 A14 = 1,950439912E+02 -1,308771341E+02 1,549390150E+04 -2,664403193E+03 A16 = 1,013904709E+03 1,589472959E+02 4,163977929E+04 5,996846620E+03 A18 = - - 7,577937344E+04 -9,593482594E+03 A20 = - - 9,161939012E+04 1,094572551E+04 A22 = - - 7,019405269E+04 -8,821797714E+03 A24 = - - 3,074857833E+04 4,896614337E+03 A26 = - - 5,853447664E+03 -1,778327748E+03 A28 = - - - 3,800070725E+02 A30 = - - - -3,619963185E+01 Area # 11 12 k = -3,04907E+01 -3,98726E+00 A4 = 3,474911968E-01 -5,512118978E-01 A6 = -7,242945533E+00 8,337051385E-01 A8 = 3,133359093E+01 -2,473217238E+00 A10 = -8,013313078E+01 7,998502677E+00 A12 = 1,348524519E+02 -1,735655350E+01 A14 = -1,564230771E+02 2,470755797E+01 A16 = 1,290354673E+02 -2,405254802E+01 A18 = -7,708735196E+01 1,646913583E+01 A20 = 3,353385681E+01 -8,017832179E+00 A22 = -1,053713011E+01 2,761249840E+00 A24 = 2,332618286E+00 -6,573258926E-01 A26 = -3,454017301E-01 1,028504071E-01 A28 = 3,072612736E-02 -9,512771618E-03 A30 = -1,242197994E-03 3,939399631E-04

[0086] Table 1A shows the radius of curvature, thickness, and focal length in millimeters (mm). Surface numbers 0–15 represent the surfaces arranged sequentially along the optical axis from the object side to the image side. In Table 1B, k represents the conic coefficient of the equation for the aspherical surface profiles. A4–A30 represent the aspherical coefficients from the 4th to the 30th order. The tables shown below for each embodiment contain the corresponding schematic parameters and aberration curves, and the definitions in the tables are the same as in Table 1A and Table 1B of the first embodiment. Therefore, no further explanation is given. Second embodiment

[0087] Fig. Figure 3 shows 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.Figure 3 of the image acquisition unit 2 comprises the optical photography system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical photography system comprises, in order from an object side to an image side along an optical axis, an aperture diaphragm ST, a first lens element E1, a second lens element E2, an aperture S1, a third lens element E3, an aperture S2, a fourth lens element E4, a fifth lens element E5, a filter E6, and an image area IMG. The optical photography system comprises five lens elements (E1, E2, E3, E4, and E5), with no additional lens elements arranged between any of the adjacent five lens elements.

[0088] 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 a 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 a region offset from the axis.

[0089] The second lens element E2, 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 second lens element E2 is made of a plastic material and has both aspherical object-side and image-side surfaces. 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 a region offset from the axis. The image-side surface of the second lens element E2 has a critical point in a region offset from the axis.

[0090] 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 a plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the third lens element E3 has an inflection point.

[0091] The fourth lens element E4, 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 fourth lens element E4 is made of a 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 a critical point in a region offset from the axis.

[0092] The fifth lens element E5, 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 fifth lens element E5 is made of a plastic material and has both aspherical object-side and image-side surfaces. The object-side surface of the fifth lens element E5 has two inflection points. The image-side surface of the fifth lens element E5 has two inflection points. The object-side surface of the fifth lens element E5 has two critical points in a region offset from the axis. The image-side surface of the fifth lens element E5 has one critical point in a region offset from the axis.

[0093] The E6 filter is made of glass and is located between the fifth lens element E5 and the image area IMG, and does not affect the focal length of the optical photography system. The IS image sensor is located on or near the image area IMG of the optical photography system.

[0094] The detailed optical data of the second embodiment are shown in Table 2A below, and the data of the aspherical surface are shown in Table 2B below. Table 2A second embodiment f = 2.27 mm, Fno = 2.23, HFOV = 42.1 degrees Area # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture stop plan -0.167 2 Lens 1 0,7936 (ASP) 0,369 plastic 1,534 56,0 1,79 3 3,8915 (ASP) 0,060 4 Lens 2 -2,6380 (ASP) 0,168 plastic 1,669 19,5 -8,45 5 -5,0698 (ASP) 0,051 6 Aperture plan 0,099 7 Lens 3 -4,5470 (ASP) 0,161 plastic 1,697 16,3 -25,12 8 -6,2312 (ASP) 0,067 9 Aperture plan 0,340 10 Lens 4 8,6134 (ASP) 0,220 plastic 1,587 28,3 11,97 11 -37,7796 (ASP) 0,263 12 Lens 5 1,4278 (ASP) 0,249 plastic 1,551 44,8 -4,26 13 0,8327 (ASP) 0,200 14 filter plan 0,210 Glass 1,517 64,2 - 15 plan 0,171 16 Picture plan - Note: Reference wavelength is 587.6 nm (d-line). The effective radius of aperture S1 (area 6) is 0.448 mm. The effective radius of aperture S2 (area 9) is 0.846 mm. Table 2B aspheric coefficients Area # 2 3 4 5 k = -2,34856E+00 -7,86546E+01 2,19881E+01 7,12683E+01 A4 = 4,947032840E-01 -1,279434441E-01 2,393238259E-01 5,510643631E-01 A6 = 3,334351271E+00 -3,720400601 E+00 1,987896400E+00 -9,946104728E+00 A8 = -9,787229698E+01 6,773320711E+01 -2,113522383E+01 4,228249706E+02 A10 = 1,511512793E+03 -1,044227138E+03 5,525069589E+02 -9,078766470E+03 A12 = -1,410956617E+04 1,037203089E+04 -8,703456461 E+03 1,252380153E+05 A14 = 8,066866831 E+04 -6,567511799E+04 8,870115800E+04 -1,133726991E+06 A16 = -2,767268700E+05 2,567067939E+05 -5,749358852E+05 6,686766629E+06 A18 = 5,214741244E+05 -5,566447532E+05 2,292166533E+06 -2,472283890E+07 A20 = -4,149046633E+05 5,074534219E+05 -5,081490416E+06 5,200632165E+07 A22 = - - 4,768595763E+06 -4,750633160E+07 Area # 7 8 10 11 k = 9,02298E+01 9,35452E+01 4,93620E+01 -1,83199E+01 A4 = -9,967826434E-01 -7,792097265E-01 -1,219134760E-01 1,084072101E-01 A6 = 1,965010017E+00 5,485452517E-01 1,730351488E+00 9,615771324E-02 A8 = -2,374867336E+01 1,683413466E+00 -5,085584720E+01 -2,720221326E+01 A10 = 1,828145531E+02 -2,852066980E+01 5,153458542E+02 2,784026809E+02 A12 = -9,350543852E+02 1,593238784E+02 -3,068774453E+03 -1,500481342E+03 A14 = 2,444572378E+03 -4,333999398E+02 1,167906048E+04 5,091425118E+03 A16 = -2,729645954E+03 5,428397618E+02 -2,954507075E+04 -1,168540923E+04 A18 = - - 5,040926423E+04 1,880738668E+04 A20 = - - -5,757517962E+04 -2,155422639E+04 A22 = - - 4,237585392E+04 1,755669077E+04 A24 = - - -1,823074805E+04 -9,952967939E+03 A26 = - - 3,489868941 E+03 3,738299108E+03 A28 = - - - -8,368784974E+02 A30 = - - - 8,455644539E+01 Area # 12 13 k = -6,39061E+01 -4,26644E+00 A4 = 8,978721176E-01 -2,143789198E-01 A6 = -1,211351689E+01 -1,552432466E+00 A8 = 5,224119008E+01 4,913894871E+00 A10 = -1,389430648E+02 -3,886155738E+00 A12 = 2,495698325E+02 -1,032449315E+01 A14 = -3,130041649E+02 3,360423360E+01 A16 = 2,801262407E+02 -4,725711202E+01 A18 = -1,812243785E+02 4,074625273E+01 A20 = 8,500577324E+01 -2,338581017E+01 A22 = -2,865541210E+01 9,134324309E+00 A24 = 6,770811438E+00 -2,404791878E+00 A26 = -1,065133153E+00 4,089387081E-01 A28 = 1,002501295E-01 -4,059652810E-02 A30 = -4,273107028E-03 1,787987340E-03

[0095] 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 shown in Table 2C are also the same as those in the first embodiment, with corresponding values ​​for the second embodiment, so no further explanation is necessary.

[0096] Furthermore, these parameters from Table 2A and Table 2B can be calculated as the following values ​​and satisfy the following conditions: Table 2C schematic parameters f [mm] 2,27 f / f34 0,11 Fno 2,23 |R2 / R4| 0,77 HFOV [Grade] 42,1 |R3 / R5| 0,58 FOV [degrees] 84,2 |R9 / R7| 0,17 TL / lmgH 1,14 (R4-R5) / (R4+R5) 0,05 ImgH / f 1,01 CT4 / CT5 0,88 TL / R7 0,31 CT5 / T34 0,61 TL / R8 -0,07 T12 / T45 0,23 BL / T34 1,43 Dr1r6 / Dr6r10 0,80 |f / f2|+|f / f3|+|f / f4| 0,55 V2+V3+V4 64,1 |f1 / f2| 0.21 Y5R2 / Y3R2 2,94 |f5 / f3| 0.17 - - Third embodiment

[0097] Fig. Figure 5 shows a schematic view of an image acquisition unit according to the third 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.Figure 5 of the image acquisition unit 3 comprises the optical photography system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical photography system comprises, in order from an object side to an image side along an optical axis, an aperture diaphragm ST, a first lens element E1, a second lens element E2, an aperture S1, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a filter E6, and an image area IMG. The optical photography system comprises five lens elements (E1, E2, E3, E4, and E5), with no additional lens elements arranged between any of the adjacent five lens elements.

[0098] 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 a 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 a region offset from the axis.

[0099] The second lens element E2, 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 second lens element E2 is made of a plastic material and has both aspherical object-side and image-side surfaces. 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 a region offset from the axis. The image-side surface of the second lens element E2 has a critical point in a region offset from the axis.

[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 a plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the third lens element E3 has an inflection point.

[0101] The fourth lens element E4, 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 fourth lens element E4 is made of a plastic material and has both aspherical object-side and image-side surfaces. 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 one inflection point. The object-side surface of the fourth lens element E4 has a critical point in a region offset from the axis.

[0102] The fifth lens element E5, 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 fifth lens element E5 is made of a plastic material and has both aspherical object-side and image-side surfaces. The object-side surface of the fifth lens element E5 has two inflection points. The image-side surface of the fifth lens element E5 has two inflection points. The object-side surface of the fifth lens element E5 has a critical point in a region offset from the axis. The image-side surface of the fifth lens element E5 has a critical point in a region offset from the axis.

[0103] The E6 filter is made of glass and is located between the fifth lens element E5 and the image area IMG, and does not affect the focal length of the optical photography system. The IS image sensor is located on or near the image area IMG of the optical photography system.

[0104] The detailed optical data of the third embodiment are shown in Table 3A below, and the data of the aspherical surface are shown in Table 3B. Table 3A third embodiment f = 2.29 mm, Fno = 2.23, HFOV = 42.6 degrees Area # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture stop plan -0,167 2 Lens 1 0,8080 (ASP) 0,325 plastic 1,545 56,1 1,79 3 4,0716 (ASP) 0,060 4 Lens 2 -2,4910 (ASP) 0,160 plastic 1,669 19,5 -7,10 5 -5,3716 (ASP) 0,044 6 Aperture plan 0,076 7 Lens 3 -4,2894 (ASP) 0,165 plastic 1,669 19,5 -175598,18 8 -4,3557 (ASP) 0,475 9 Lens 4 7,1712 (ASP) 0,220 plastic 1,566 37,4 9,71 10 -23,3236 (ASP) 0,306 11 Lens 5 1,7219 (ASP) 0,220 plastic 1,534 56,0 -3,30 12 0,8324 (ASP) 0,200 13 filter plan 0,210 Glass 1,517 64,2 - 14 plan 0,153 15 Picture plan - Note: Reference wavelength is 587.6 nm (d-line). The effective radius of aperture S1 (area 6) is 0.425 mm. Table 3B aspheric coefficients Area # 2 3 4 5 k = -2,42840E+00 -3,64134E+01 1,62643E+01 9,90000E+01 A4 = 5,367226985E-01 -2,104013242E-01 6,232408259E-01 1,077957763E+00 A6 = 3,039216990E+00 1,203353888E+01 -3,651797107E-01 -3,649481817E+01 A8 = -2,066227499E+02 -6,648734927E+02 1,618071358E+01 2,085649184E+03 A10 = 7,168109018E+03 2,113880084E+04 3,447603006E+02 -7,539812516E+04 A12 = -1,568258461E+05 -4,408037029E+05 -4,095201093E+04 1,844017505E+06 A14 = 2,312394013E+06 6,277552473E+06 1,357560761E+06 -3,158706797E+07 A16 = -2,388804754E+07 -6,249321392E+07 -2,483871763E+07 3,870178198E+08 A18 = 1,765256135E+08 4,384234962E+08 2,870066681 E+08 -3,425241139E+09 A20 = -9,400290982E+08 -2,154259903E+09 -2,201777262E+09 2,188646514E+10 A22 = 3,585527155E+09 7,242463170E+09 1,138547845E+10 -9,976231892E+10 A24 = -9,572141852E+09 -1,584016390E+10 -3,926155801E+10 3,155311918E+11 A26 = 1,700610269E+10 2,026859875E+10 8,656765289E+10 -6,562141543E+11 A28 = -1,807025737E+10 -1,149173100E+10 -1,104078561E+11 8,047237754E+11 A30 = 8,685067626E+09 - 6,196072094E+10 -4,395633673E+11 Area # 7 8 9 10 k = -5,90281E+01 -7,21106E+01 4,71780E+01 -1,08600E+02 A4 = -7,823704959E-01 -3,904160242E-01 1,130436713E-01 3,594944686E-01 A6 = 6,076396855E+00 -1,002475705E+01 -4,743567572E+00 -6,941042286E+00 A8 = -2,646421956E+02 3,833829551E+02 6,173336534E+01 7,277175652E+01 A10 = 6,239122782E+03 -8,845746385E+03 -5,059216619E+02 -4,536629824E+02 A12 = -9,314444235E+04 1,343942615E+05 2,696181602E+03 1,821303119E+03 A14 = 9,100244003E+05 -1,395307897E+06 -1,013967952E+04 -5,036950697E+03 A16 = -5,871302267E+06 1,011327091E+07 2,819798862E+04 9,945981427E+03 A18 = 2,462734408E+07 -5,147170062E+07 -5,931023790E+04 -1,425111235E+04 A20 = -6,393219975E+07 1,820212952E+08 9,446628310E+04 1,484586174E+04 A22 = 9,185176505E+07 -4,322229915E+08 -1,118756361E+05 -1,111746894E+04 A24 = -5,441730245E+07 6,354889391E+08 9,482583917E+04 5,822603608E+03 A26 = - -4,589015322E+08 -5,390551636E+04 -2,021703058E+03 A28 = - -1,492284331E+07 1,826116404E+04 4,176059918E+02 A30 = - 1,700772959E+08 -2,768026832E+03 -3,880668727E+01 Area # 11 12 k = -7,84466E+01 -3,90558E+00 A4 = 2,083903118E-01 -5,297010738E-01 A6 = -1,032967792E+01 -1,580752587E+00 A8 = 5,590604994E+01 1,179605802E+01 A10 = -1,726020974E+02 -3,588814411E+01 A12 = 3,437325870E+02 6,814060837E+01 A14 = -4,658299801 E+02 -8,944224499E+01 A16 = 4,451674233E+02 8,444654633E+01 A18 = -3,063255886E+02 -5,821831993E+01 A20 = 1,528790899E+02 2,933195668E+01 A22 = -5,496403272E+01 -1,067436861E+01 A24 = 1,389688272E+01 2,729398146E+00 A26 = -2,347652943E+00 -4,646984270E-01 A28 = 2,381129678E-01 4,724848449E-02 A30 = -1,097260593E-02 -2,168001883E-03

[0105] 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 shown in Table 3C are also the same as those in the first embodiment, with corresponding values ​​for the third embodiment, so no further explanation is necessary.

[0106] Furthermore, these parameters from Table 3A and Table 3B can be calculated as the following values ​​and satisfy the following conditions: Table 3C schematic parameters f [mm] 2,29 f / f34 0,24 Fno 2,23 |R2 / R4| 0,76 HFOV [Grade] 42,6 |R3 / R5| 0,58 FOV [degrees] 85,2 |R9 / R7| 0,24 TL / lmgH 1,14 (R4-R5) / (R4+R5) 0,11 ImgH / f 1,00 CT4 / CT5 1,00 TL / R7 0,36 CT5 / T34 0,46 TL / R8 -0,11 T12 / T45 0,20 BL / T34 1,19 Dr1r6 / Dr6r10 0,68 |f / f2|+|f / f3|+|f / f4| 0,56 V2+V3+V4 76,4 |f1 / f2| 0,25 Y5R2 / Y3R2 3,02 |f5 / f3| 0,00002 - - Fourth embodiment

[0107] Fig. Figure 7 shows a schematic view of an image acquisition unit according to the fourth embodiment of the present disclosure. Fig. Figure 8 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the fourth embodiment. Fig.Figure 7 of the image acquisition unit 4 comprises the optical photography system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical photography system comprises, in order from an object side to an image side along an optical axis, an aperture diaphragm ST, a first lens element E1, a second lens element E2, an aperture S1, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a filter E6, and an image area IMG. The optical photography system comprises five lens elements (E1, E2, E3, E4, and E5), with no additional lens elements arranged between any of the adjacent five lens elements.

[0108] 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 a 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 a region offset from the axis.

[0109] The second lens element E2, 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 second lens element E2 is made of a plastic material and has both aspherical object-side and image-side surfaces. 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 a region offset from the axis. The image-side surface of the second lens element E2 has a critical point in a region offset from the axis.

[0110] 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 a plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the third lens element E3 has an inflection point.

[0111] The fourth lens element E4, 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 fourth lens element E4 is made of a plastic material and has both aspherical object-side and image-side surfaces. 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 one inflection point. The object-side surface of the fourth lens element E4 has a critical point in a region offset from the axis. The image-side surface of the fourth lens element E4 has a critical point in a region offset from the axis.

[0112] The fifth lens element E5, 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 fifth lens element E5 is made of a plastic material and has both aspherical object-side and image-side surfaces. The object-side surface of the fifth lens element E5 has two inflection points. The image-side surface of the fifth lens element E5 has two inflection points. The object-side surface of the fifth lens element E5 has two critical points in a region offset from the axis. The image-side surface of the fifth lens element E5 has one critical point in a region offset from the axis.

[0113] The E6 filter is made of glass and is located between the fifth lens element E5 and the image area IMG, and does not affect the focal length of the optical photography system. The IS image sensor is located on or near the image area IMG of the optical photography system.

[0114] The detailed optical data of the fourth embodiment are shown in Table 4A below, and the data of the aspherical surface are shown in Table 4B. Table 4A fourth embodiment f = 2.21 mm, Fno = 2.23, HFOV = 44.4 degrees Area # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture stop plan -0.140 2 Lens 1 0,7979 (ASP) 0,312 plastic 1,535 55,9 1,88 3 3,3272 (ASP) 0,062 4 Lens 2 -2,8885 (ASP) 0,169 plastic 1,650 21,8 -13,64 5 -4,3839 (ASP) 0,040 6 Aperture plan 0,073 7 Lens 3 -4,2658 (ASP) 0,180 plastic 1,697 16,3 -111,17 8 -4,5925 (ASP) 0,388 9 Lens 4 4,1732 (ASP) 0,226 plastic 1,697 16,3 97,69 10 4,3467 (ASP) 0,271 11 Lens 5 1,6585 (ASP) 0,328 plastic 1,567 37,4 -4,97 12 0,9688 (ASP) 0,200 13 filter plan 0,210 Glass 1,517 64,2 - 14 plan 0,153 15 Picture plan - Note: Reference wavelength is 587.6 nm (d-line). The effective radius of aperture S1 (area 6) is 0.414 mm. Table 4B aspheric coefficients Area # 2 3 4 5 k = -2,70450E+00 -7,85659E+01 2,42849E+01 7,64369E+01 A4 = 5,404484858E-01 -2,904665152E-02 2,022182880E-01 4,702371083E-01 A6 = 2,464408051 E+00 -5,359703198E+00 3,767889518E+00 -3,773562949E+00 A8 = -6,623251128E+01 9,019599613E+01 -1,333373668E+02 2,328317626E+02 A10 = 8,421941380E+02 -1,352895413E+03 3,582914010E+03 -5,218643701E+03 A12 = -6,695349242E+03 1,304631162E+04 -5,565105776E+04 7,181821416E+04 A14 = 3,304975787E+04 -8,093154016E+04 5,386187689E+05 -6,240211694E+05 A16 = -9,972269163E+04 3,168003299E+05 -3,285938576E+06 3,396537544E+06 A18 = 1,665252487E+05 -7,029691710E+05 1,232233057E+07 -1,104989457E+07 A20 = -1,168138116E+05 6,663060799E+05 -2,594037693E+07 1,908293074E+07 A22 = - - 2,344719714E+07 -1,273271582E+07 Area # 7 8 9 10 k = 6,36027E+01 5,88631E+01 1,73718E+01 -9,85695E+01 A4 = -8,638105136E-01 -5,274530990E-01 -1,367695385E-01 1,297316084E-01 A6 = 7,370394422E+00 4,725513410E-01 -3,437096214E+00 -4,988406189E+00 A8 = -1,500774621E+02 4,137253084E+00 4,046456653E+01 5,052663989E+01 A10 = 1,772483006E+03 -6,001244304E+01 -3,062071003E+02 -3,064951521E+02 A12 = -1,225819803E+04 3,647418792E+02 1,455920111E+03 1,209042343E+03 A14 = 4,504131987E+04 -1,025143871E+03 -4,580563050E+03 -3,302072759E+03 A16 = -6,940625317E+04 1,221218530E+03 9,631070736E+03 6,449699367E+03 A18 = - - -1,325400591 E+04 -9,136373862E+03 A20 = - - 1,120175765E+04 9,396089893E+03 A22 = - - -4,943888292E+03 -6,937334352E+03 A24 = - - 5,408814834E+02 3,579681487E+03 A26 = - - 2,180054524E+02 -1,224689566E+03 A28 = - - - 2,494857315E+02 A30 = - - - -2,290158819E+01 Area # 11 12 k = -7,60680E+01 -4,75360E+00 A4 = 5,008008168E-01 -2,103225499E-01 A6 = -9,985792877E+00 -2,194178115E+00 A8 = 4,828538260E+01 1,150467798E+01 A10 = -1,382703050E+02 -3,233104794E+01 A12 = 2,615838577E+02 6,079515440E+01 A14 = -3,429165818E+02 -8,106185831E+01 A16 = 3,210994742E+02 7,809354800E+01 A18 = -2,184188708E+02 -5,463287425E+01 A20 = 1,083952703E+02 2,766384445E+01 A22 = -3,889990498E+01 -1,001049214E+01 A24 = 9,840040949E+00 2,519544318E+00 A26 = -1,665203371E+00 -4,185562019E-01 A28 = 1,692783900E-01 4,123132692E-02 A30 = -7,818827092E-03 -1,823342024E-03

[0115] 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 shown in Table 4C are also the same as those in the first embodiment, with corresponding values ​​for the fourth embodiment, so no further explanation is necessary.

[0116] Furthermore, these parameters from Table 4A and Table 4B can be calculated as the following values ​​and satisfy the following conditions: Table 4C schematic parameters f [mm] 2,21 f / f34 0,003 Fno 2,23 |R2 / R4| 0,76 HFOV [Grade] 44,4 |R3 / R5| 0,68 FOV [degrees] 88,8 |R9 / R7| 0,40 TL / lmgH 1,16 (R4-R5) / (R4+R5) 0,01 ImgH / f 1,02 CT4 / CT5 0,69 TL / R7 0,63 CT5 / T34 0,85 TL / R8 0,60 T12 / T45 0,23 BL / T34 1,45 Dr1r6 / Dr6r10 0,69 |f / f2|+|f / f3|+|f / f4| 0,20 V2+V3+V4 54,4 |f1 / f2| 0,14 Y5R2 / Y3R2 3,04 |f5 / f3| 0,04 - - Fifth embodiment

[0117] Fig. Figure 9 shows a schematic view of an image acquisition unit according to the fifth embodiment of the present disclosure. Fig. Figure 10 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the fifth embodiment. Fig.Figure 9 of the image acquisition unit 5 comprises the optical photography system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical photography system comprises, in order from an object side to an image side along an optical axis, an aperture diaphragm ST, a first lens element E1, a second lens element E2, an aperture S1, a third lens element E3, an aperture S2, a fourth lens element E4, a fifth lens element E5, a filter E6, and an image area IMG. The optical photography system comprises five lens elements (E1, E2, E3, E4, and E5), with no additional lens elements arranged between any of the adjacent five lens elements.

[0118] 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 a 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 a region offset from the axis.

[0119] The second lens element E2, 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 second lens element E2 is made of a plastic material and has both aspherical object-side and image-side surfaces. 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 a region offset from the axis. The image-side surface of the second lens element E2 has a critical point in a region offset from the axis.

[0120] 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 a plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the third lens element E3 has an inflection point.

[0121] The fourth lens element E4, 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 fourth lens element E4 is made of a plastic material and has both aspherical object-side and image-side surfaces. 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 one inflection point. The object-side surface of the fourth lens element E4 has a critical point in a region offset from the axis. The image-side surface of the fourth lens element E4 has a critical point in a region offset from the axis.

[0122] The fifth lens element E5, 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 fifth lens element E5 is made of a plastic material and has both aspherical object-side and image-side surfaces. The object-side surface of the fifth lens element E5 has two inflection points. The image-side surface of the fifth lens element E5 has two inflection points. The object-side surface of the fifth lens element E5 has two critical points in a region offset from the axis. The image-side surface of the fifth lens element E5 has one critical point in a region offset from the axis.

[0123] The E6 filter is made of glass and is located between the fifth lens element E5 and the image area IMG, and does not affect the focal length of the optical photography system. The IS image sensor is located on or near the image area IMG of the optical photography system.

[0124] The detailed optical data of the fifth embodiment are shown in Table 5A below, and the data of the aspherical surface are shown in Table 5B. Table 5A fifth embodiment f = 2.27 mm, Fno = 2.23, HFOV = 42.8 degrees Area # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture stop plan -0,167 2 Lens 1 0,8092 (ASP) 0,318 plastic 1,545 56,1 1,84 3 3,6408 (ASP) 0,065 4 Lens 2 -2,7645 (ASP) 0,160 plastic 1,669 19,5 -8,01 5 -5,8434 (ASP) 0,037 6 Aperture plan 0,071 7 Lens 3 -6,0415 (ASP) 0,178 plastic 1,669 19,5 -158663 8 -6,1132 (ASP) 0,045 9 Aperture plan 0,375 10 Lens 4 2,2751 (ASP) 0,187 plastic 1,566 37,4 54,19 11 2,3843 (ASP) 0,313 12 Lens 5 1,5835 (ASP) 0,302 plastic 1,534 56,0 -5,19 13 0,9411 (ASP) 0,200 14 filter plan 0,210 Glass 1,517 64,2 - 15 plan 0,152 16 Picture plan - Note: Reference wavelength is 587.6 nm (d-line). The effective radius of aperture S1 (area 6) is 0.425 mm. The effective radius of aperture S2 (area 9) is 0.696 mm. Table 5B aspheric coefficients Area # 2 3 4 5 k = -2,47806E+00 -4,04771E+01 2,53979E+01 9,69289E+01 A4 = 4,726068401E-01 -2,917899069E-01 3,653702946E-01 5,408239456E-01 A6 = 4,431791628E+00 1,968902783E+01 1,291801625E+01 -1,053616231E+01 A8 = -1,593456659E+02 -1,134938279E+03 -9,371437990E+02 5,496950993E+02 A10 = 3,818847239E+03 3,917394897E+04 4,223999387E+04 -1,408373173E+04 A12 = -6,968376755E+04 -9,014900520E+05 -1,222680474E+06 1,927471293E+05 A14 = 9,713184706E+05 1,444457571E+07 2,402112165E+07 -7,184257463E+05 A16 = -1,015746289E+07 -1,653982750E+08 -3,302223748E+08 -2,199898155E+07 A18 = 7,821753607E+07 1,370857260E+09 3,226723398E+09 4,591815392E+08 A20 = -4,369366746E+08 -8,236103349E+09 -2,249658967E+10 -4,578963024E+09 A22 = 1,740202867E+09 3,549160104E+10 1,109689341E+11 2,819781488E+10 A24 = -4,804099001 E+09 -1,068292349E+11 -3,778766513E+11 -1,118756551E+11 A26 = 8,726146425E+09 2,130664963E+11 8,441886824E+11 2,788807368E+11 A28 = -9,374995799E+09 -2,527664279E+11 -1,112506454E+12 -3,974063295E+11 A30 = 4,511881808E+09 1,348771734E+11 6,549946787E+11 2,466191049E+11 Area # 7 8 10 11 k = 4,00833E+01 -8,22567E-01 4,12408E+00 -2,01538E+01 A4 = -1,070473700E+00 -5,042068980E-01 1,567237058E-01 5,795941704E-01 A6 = 3,508392055E+01 1,218047747E+00 -1,151273460E+01 -1,207658252E+01 A8 = -1,959891936E+03 -9,292661569E+01 1,351193167E+02 1,060796186E+02 A10 = 7,152631308E+04 3,958703115E+03 -1,057879083E+03 -5,675882073E+02 A12 = -1,780130985E+06 -9,096403896E+04 6,033527832E+03 1,997071680E+03 A14 = 3,123707031E+07 1,327931829E+06 -2,659967382E+04 -4,874689999E+03 A16 = -3,941582386E+08 -1,315912495E+07 9,115905087E+04 8,516101419E+03 A18 = 3,608130083E+09 9,134203133E+07 -2,375055386E+05 -1,081744645E+04 A20 = -2,393615412E+10 -4,492170817E+08 4,570800889E+05 1,002518433E+04 A22 = 1,136928211E+11 1,558142165E+09 -6,307545979E+05 -6,716646537E+03 A24 = -3,762172508E+11 -3,726897134E+09 6,017302035E+05 3,170939281E+03 A26 = 8,224749470E+11 5,848087837E+09 -3,747952745E+05 -1,001182587E+03 A28 = -1,066439337E+12 -5,415734770E+09 1,366532782E+05 1,898063714E+02 A30 = 6,204571803E+11 2,242080207E+09 -2,206763758E+04 -1,633685601E+01 Area # 12 13 k = -9,90000E+01 -9,21490E+00 A4 = 9,710909771E-01 4,395228781E-01 A6 = -1,378979508E+01 -5,096737292E+00 A8 = 6,281853884E+01 1,876206053E+01 A10 = -1,716457714E+02 -4,262380474E+01 A12 = 3,106473749E+02 6,666266212E+01 A14 = -3,890955396E+02 -7,515072230E+01 A16 = 3,469866196E+02 6,232642577E+01 A18 = -2,239350132E+02 -3,826306043E+01 A20 = 1,050614715E+02 1,731542117E+01 A22 = -3,553383844E+01 -5,690988049E+00 A24 = 8,449839798E+00 1,318936773E+00 A26 = -1,341493723E+00 -2,040616316E-01 A28 = 1,277259369E-01 1,889562683E-02 A30 = -5,518175195E-03 -7,913288411E-04

[0125] In the fifth 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 shown in Table 5C are also the same as those in the first embodiment, with corresponding values ​​for the fifth embodiment, so no further explanation is necessary.

[0126] Furthermore, these parameters from Table 5A and Table 5B can be calculated as the following values ​​and satisfy the following conditions: Table 5C schematic parameters f [mm] 2,27 f / f34 0,04 Fno 2,23 |R2 / R4| 0,62 HFOV [Grade] 42,8 |R3 / R5| 0,46 FOV [degrees] 85,6 |R9 / R7| 0,70 TL / lmgH 1,14 (R4-R5) / (R4+R5) -0,02 ImgH / f 1,02 CT4 / CT5 0,62 TL / R7 1,15 CT5 / T34 0,72 TL / R8 1,10 T12 / T45 0,21 BL / T34 1,34 Dr1r6 / Dr6r10 0,68 |f / f2|+|f / f3|+|f / f4| 0,32 V2+V3+V4 76,4 |f1 / f2| 0,23 Y5R2 / Y3R2 3,07 |f5 / f3| 0,00003 - - Sixth embodiment

[0127] Fig. Figure 11 shows a schematic view of an image acquisition unit according to the sixth 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 sixth embodiment. Fig.Figure 11 of the image acquisition unit 6 comprises the optical photography system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical photography system comprises, in order from an object side to an image side along an optical axis, an aperture diaphragm ST, a first lens element E1, a second lens element E2, an aperture S1, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a filter E6, and an image area IMG. The optical photography system comprises five lens elements (E1, E2, E3, E4, and E5), with no additional lens elements arranged between any of the adjacent five lens elements.

[0128] 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 a 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 a region offset from the axis.

[0129] The second lens element E2, 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 second lens element E2 is made of a plastic material and has both aspherical object-side and image-side surfaces. 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 a region offset from the axis. The image-side surface of the second lens element E2 has a critical point in a region offset from the axis.

[0130] The third lens element E3, 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 third lens element E3 is made of a plastic material and has both aspherical object-side and image-side surfaces. 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.

[0131] 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 a plastic material and has both aspherical object-side and image-side surfaces. The object-side surface of the fourth lens element E4 has one inflection point. The image-side surface of the fourth lens element E4 has two inflection points.

[0132] The fifth lens element E5, 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 fifth lens element E5 is made of a plastic material and has both aspherical object-side and image-side surfaces. The object-side surface of the fifth lens element E5 has two inflection points. The image-side surface of the fifth lens element E5 has two inflection points. The object-side surface of the fifth lens element E5 has two critical points in a region offset from the axis. The image-side surface of the fifth lens element E5 has one critical point in a region offset from the axis.

[0133] The E6 filter is made of glass and is located between the fifth lens element E5 and the image area IMG, and does not affect the focal length of the optical photography system. The IS image sensor is located on or near the image area IMG of the optical photography system.

[0134] The detailed optical data of the sixth embodiment are shown in Table 6A below, and the data of the aspherical surface are shown in Table 6B below. Table 6A sixth embodiment f = 2.29 mm, Fno = 2.23, HFOV = 42.7 degrees Area # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture stop plan -0,167 2 Lens 1 0,7874 (ASP) 0,332 plastic 1,544 56,0 1,78 3 3,5505 (ASP) 0,060 4 Lens 2 -3,0196 (ASP) 0,160 plastic 1,661 20,3 -6,11 5 -12,2433 (ASP) 0,051 6 Aperture plan 0,086 7 Lens 3 -7,8008 (ASP) 0,186 plastic 1,639 23,5 21,54 8 -5,0237 (ASP) 0,420 9 Lens 4 -17,8571 (ASP) 0,231 plastic 1,669 19,5 -81,15 10 -26,7469 (ASP) 0,228 11 Lens 5 1,2465 (ASP) 0,296 plastic 1,567 37,4 -4,96 12 0,7895 (ASP) 0,200 13 filter plan 0,210 Glass 1,517 64,2 - 14 plan 0,178 15 Picture plan - Note: Reference wavelength is 587.6 nm (d-line). The effective radius of aperture S1 (area 6) is 0.425 mm. Table 6B aspheric coefficients Area # 2 3 4 5 k = -2,44358E+00 -8,86738E+01 2,39035E+01 -8,32544E+01 A4 = 5,338746459E-01 -8,864467003E-02 2,493099638E-01 7,348367638E-01 A6 = 2,517955987E+00 -4,082421866E+00 3,278674025E+00 -1,124023342E+01 A8 = -7,076663578E+01 7,470265156E+01 -6,060863824E+01 4,911426527E+02 A10 = 1,014846594E+03 -1,234970076E+03 1,261861301E+03 -1,058072744E+04 A12 = -9,039433436E+03 1,271794124E+04 -1,683208134E+04 1,453272333E+05 A14 = 4,988913409E+04 -8,114144898E+04 1,475590371E+05 -1,297713121E+06 A16 = -1,667826869E+05 3,133001373E+05 -8,395394654E+05 7,484836934E+06 A18 = 3,071038701E+05 -6,691764347E+05 2,989113969E+06 -2,675374797E+07 A20 = -2,387899079E+05 6,057651157E+05 -6,038119570E+06 5,354297966E+07 A22 = - - 5,276240867E+06 -4,539222778E+07 Area # 7 8 9 10 k = -7,76986E+01 -2,67164E+01 9,90000E+01 -9,90000E+01 A4 = -7,006560986E-01 -5,225697727E-01 -8,045195164E-02 -2,007786432E-01 A6 = 8,347407255E-01 -6,670595928E-01 -2,879018595E-01 3,180048639E-01 A8 = -1,408997955E+01 7,742838727E+00 -9,976453311E+00 -5,537402810E-01 A10 = 9,257585623E+01 -6,074070053E+01 1,419184513E+02 1,047924709E+01 A12 = -2,129240549E+02 2,713606474E+02 -1,112500945E+03 -1,207167187E+02 A14 = -7,652667360E+02 -6,597132834E+02 5,292615405E+03 5,789848037E+02 A16 = 3,585265004E+03 7,185203431E+02 -1,628026527E+04 -1,594346660E+03 A18 = - - 3,336333264E+04 2,856757101E+03 A20 = - - -4,561209944E+04 -3,520468221 E+03 A22 = - - 4,016430331E+04 3,044528469E+03 A24 = - - -2,063141720E+04 -1,832654627E+03 A26 = - - 4,690050041 E+03 7,357177084E+02 A28 = - - - -1,775318355E+02 A30 = - - - 1,947671916E+01 Area # 11 12 k = -3,89786E+01 -4,25590E+00 A4 = 2,774869466E-01 -6,812986661E-01 A6 = -7,280336942E+00 1,599908672E+00 A8 = 3,442109319E+01 -5,266082544E+00 A10 = -9,505264974E+01 1,593030500E+01 A12 = 1,710393972E+02 -3,418621321E+01 A14 = -2,108772492E+02 5,007957423E+01 A16 = 1,841625508E+02 -5,091928186E+01 A18 = -1,160947465E+02 3,652432256E+01 A20 = 5,312705650E+01 -1,859304672E+01 A22 = -1,750947989E+01 6,671867547E+00 A24 = 4,054095667E+00 -1,648597515E+00 A26 = -6,262435130E-01 2,668084159E-01 A28 = 5,797873958E-02 -2,544677717E-02 A30 = -2,434331622E-03 1,083870617E-03

[0135] In the sixth 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 shown in Table 6C are also the same as those in the first embodiment, with corresponding values ​​for the sixth embodiment, so no further explanation is necessary.

[0136] Furthermore, these parameters from Table 6A and Table 6B can be calculated as the following values ​​and satisfy the following conditions: Table 6C schematic parameters f [mm] 2,29 f / f34 0,08 Fno 2,23 |R2 / R4| 0,29 HFOV [Grade] 42,7 |R3 / R5| 0,39 FOV [degrees] 85,4 |R9 / R7| 0,07 TL / lmgH 1,15 (R4-R5) / (R4+R5) 0,22 ImgH / f 1,01 CT4 / CT5 0,78 TL / R7 -0,15 CT5 / T34 0,70 TL / R8 -0,10 T12 / T45 0,26 BL / T34 1,40 Dr1r6 / Dr6r10 0,74 |f / f2|+|f / f3|+|f / f4| 0,51 V2+V3+V4 63,3 |f1 / f2| 0,29 Y5R2 / Y3R2 2,92 |f5 / f3| 0,23 - - Seventh embodiment

[0137] Fig. Figure 13 shows a schematic view of an image acquisition unit according to the seventh 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 seventh embodiment. Fig.13 The image acquisition unit 7 comprises the optical photography system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical photography system comprises, in order from an object side to an image side along an optical axis, an aperture diaphragm ST, a first lens element E1, a second lens element E2, an aperture S1, a third lens element E3, a fourth lens element E4, a fifth lens element E5, a filter E6, and an image area IMG. The optical photography system comprises five lens elements (E1, E2, E3, E4, and E5), with no additional lens elements arranged between any of the adjacent five lens elements.

[0138] 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 a 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.

[0139] 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 a plastic material and has both aspherical object-side and image-side surfaces. 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 a region offset from the axis. The image-side surface of the second lens element E2 has a critical point in a region offset from the axis.

[0140] 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 a plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the third lens element E3 has an inflection point.

[0141] 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 a plastic material and has both aspherical object-side and image-side surfaces. 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 one inflection point. The object-side surface of the fourth lens element E4 has a critical point in a region offset from the axis. The image-side surface of the fourth lens element E4 has a critical point in a region offset from the axis.

[0142] The fifth lens element E5, 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 fifth lens element E5 is made of a plastic material and has both aspherical object-side and image-side surfaces. The object-side surface of the fifth lens element E5 has two inflection points. The image-side surface of the fifth lens element E5 has two inflection points. The object-side surface of the fifth lens element E5 has a critical point in a region offset from the axis. The image-side surface of the fifth lens element E5 has a critical point in a region offset from the axis.

[0143] The E6 filter is made of glass and is located between the fifth lens element E5 and the image area IMG, and does not affect the focal length of the optical photography system. The IS image sensor is located on or near the image area IMG of the optical photography system.

[0144] The detailed optical data of the seventh embodiment are shown in Table 7A below, and the data of the aspherical surface are shown in Table 7B. Table 7A seventh embodiment f = 2.89 mm, Fno = 2.23, HFOV = 42.6 degrees Area # radius of curvature thickness material index Abbe # Focal length 0 object infinity Infinity 1 Aperture stop plan -0,200 2 Lens 1 1,0199 (ASP) 0,429 plastic 1,544 56,0 2,58 3 3,1820 (ASP) 0,106 4 Lens 2 -5,1204 (ASP) 0,211 plastic 1,697 16,3 97,21 5 -4,8413 (ASP) 0,046 6 Aperture plan 0,102 7 Lens 3 -5,3268 (ASP) 0,219 plastic 1,697 16,3 -18,87 8 -9,1024 (ASP) 0,525 9 Lens 4 5,6781 (ASP) 0,298 plastic 1,697 16,3 -20,40 10 3,9707 (ASP) 0,268 11 Lens 5 1,9875 (ASP) 0,470 plastic 1,587 28,3 -11,74 12 1,4078 (ASP) 0,261 13 filter plan 0,274 Glass 1,517 64,2 - 14 plan 0,183 15 Picture plan - Note: Reference wavelength is 587.6 nm (d-line). The effective radius of aperture S1 (area 6) is 0.550 mm. Table 7B aspheric coefficients Area # 2 3 4 5 k = -2,31930E+00 -1,77106E+01 3,87796E+01 6,01237E+01 A4 = 2,794824362E-01 1,149603041E-03 4,017620131E-02 3,355382080E-01 A6 = -4,634575760E-01 -4,837808264E-01 2,718948999E+00 -6,366720923E+00 A8 = 4,677554686E+00 7,442104707E+00 -5,155497071E+01 1,460408494E+02 A10 = -3,397476972E+01 -1,117359870E+02 6,684035800E+02 -1,919794928E+03 A12 = 1,483676395E+02 8,886523161E+02 -5,552001211E+03 1,632460680E+04 A14 = -4,022333444E+02 -4,133696400E+03 3,023643002E+04 -9,107567239E+04 A16 = 6,455878909E+02 1,119747145E+04 -1,069622018E+05 3,311106754E+05 A18 = -5,668698271 E+02 -1,628160968E+04 2,363929491 E+05 -7,544781844E+05 A20 = 2,073146154E+02 9,805786465E+03 -2,959632902E+05 9,774867960E+05 A22 = - - 1,599855694E+05 -5,490976794E+05 Area # 7 8 9 10 k = 7,84535E+01 9,90000E+01 1,73375E+01 -9,90000E+01 A4 = -3,384083861 E-01 -2,668873777E-01 -1,298814685E-01 5,513147933E-02 A6 = 3,889384255E-01 2,139818865E-01 -3,288152969E-01 -1,389650877E+00 A8 = -2,751090184E+00 -4,218799663E-01 1,754994567E+00 7,258162836E+00 A10 = 1,199880197E+01 5,129713262E-01 -4,053287275E+00 -2,198635243E+01 A12 = -3,118789826E+01 1,290136499E+00 -2,250334410E+00 4,277086569E+01 A14 = 4,024033822E+01 -3,304855538E+00 3,155843083E+01 -5,723010038E+01 A16 = -1,995800636E+01 3,038359286E+00 -7,684429654E+01 5,462967297E+01 A18 = - - 1,004720908E+02 -3,783164121E+01 A20 = - - -7,930195427E+01 1,905743755E+01 A22 = - - 3,745365244E+01 -6,908780772E+00 A24 = - - -9,571759334E+00 1,754114210E+00 A26 = - - 9,814361640E-01 -2,957322790E-01 A28 = - - - 2,972755424E-02 A30 = - - - -1,349845608E-03 Area # 11 12 k = -5,73670E+01 -4,70392E+00 A4 = 3,134322024E-01 -3,983761300E-03 A6 = -3,272763036E+00 -1,061921750E+00 A8 = 9,694830836E+00 3,004352052E+00 A10 = -1,697176354E+01 -4,816473838E+00 A12 = 1,941811407E+01 5,166312901E+00 A14 = -1,525106298E+01 -3,927066502E+00 A16 = 8,491257441E+00 2,164853095E+00 A18 = -3,413372786E+00 -8,717163289E-01 A20 = 9,961521113E-01 2,555509477E-01 A22 = -2,094026385E-01 -5,378717364E-02 A24 = 3,093250390E-02 7,896943172E-03 A26 = -3,049710949E-03 -7,659249677E-04 A28 = 1,803232067E-04 4,399323986E-05 A30 = -4,839825161E-06 -1,130173386E-06

[0145] In the seventh 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 shown in Table 7C are also the same as those in the first embodiment, with corresponding values ​​for the seventh embodiment, so no further explanation is necessary.

[0146] Furthermore, these parameters from Table 7A and Table 7B can be calculated as the following values ​​and satisfy the following conditions: Table 7C schematic parameters f [mm] 2,89 f / f34 -0,31 Fno 2,23 |R2 / R4| 0,66 HFOV [Grade] 42,6 |R3 / R5| 0,96 FOV [degrees] 85,2 |R9 / R7| 0,35 TL / lmgH 1,13 (R4-R5) / (R4+R5) -0,05 ImgH / f 1,04 CT4 / CT5 0,63 TL / R7 0,60 CT5 / T34 0,90 TL / R8 0,85 T12 / T45 0,40 BL / T34 1,37 Dr1r6 / Dr6r10 0,71 | f / f2|+|f / f3|+|f / f4| 0,32 V2+V3+V4 48,9 |f1 / f2| 0,03 Y5R2 / Y3R2 2,94 |f5 / f3| 0,62 - - Eighth embodiment

[0147] Fig. Figure 15 shows a schematic view of an image acquisition unit according to the eighth embodiment of the present disclosure. Fig. Figure 16 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the eighth embodiment. Fig.Figure 15 of the image acquisition unit 8 comprises the optical photography system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical photography system comprises, in order from an object side to an image side along an optical axis, an aperture diaphragm ST, a first lens element E1, a second lens element E2, an aperture S1, a third lens element E3, an aperture S2, a fourth lens element E4, a fifth lens element E5, a filter E6, and an image area IMG. The optical photography system comprises five lens elements (E1, E2, E3, E4, and E5), with no additional lens elements arranged between any of the adjacent five lens elements.

[0148] 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 a plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the first lens element E1 has one inflection point. The image-side surface of the first lens element E1 has three inflection points. The image-side surface of the first lens element E1 has three critical points in a region offset from the axis.

[0149] The second lens element E2, 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 second lens element E2 is made of a plastic material and has both aspherical object-side and image-side surfaces. 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 a region offset from the axis. The image-side surface of the second lens element E2 has a critical point in a region offset from the axis.

[0150] The third lens element E3, 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 third lens element E3 is made of a plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the third lens element E3 has an inflection point.

[0151] 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 a plastic material and has both aspherical object-side and image-side surfaces. 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 a region offset from the axis. The image-side surface of the fourth lens element E4 has a critical point in a region offset from the axis.

[0152] The fifth lens element E5, 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 fifth lens element E5 is made of a plastic material and has both aspherical object-side and image-side surfaces. The object-side surface of the fifth lens element E5 has two inflection points. The image-side surface of the fifth lens element E5 has two inflection points. The object-side surface of the fifth lens element E5 has two critical points in a region offset from the axis. The image-side surface of the fifth lens element E5 has one critical point in a region offset from the axis.

[0153] The E6 filter is made of glass and is located between the fifth lens element E5 and the image area IMG, and does not affect the focal length of the optical photography system. The IS image sensor is located on or near the image area IMG of the optical photography system.

[0154] The detailed optical data of the eighth embodiment are shown in Table 8A below, and the data of the aspherical surface are shown in Table 8B. Table 8A eighth embodiment f = 2.25 mm, Fno = 2.01, HFOV = 43.1 degrees Area # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture stop plan -0,190 2 Lens 1 0.,8203 (ASP) 0,354 plastic 1,535 55,9 1,86 3 4,0046 (ASP) 0,064 4 Lens 2 -2,5986 (ASP) 0,141 plastic 1,657 21,3 -8,54 5 -4,9459 (ASP) 0,034 6 Aperture plan 0,095 7 Lens 3 -4,7641 (ASP) 0,200 plastic 1,697 16,3 97,48 8 -4,5288 (ASP) 0,048 9 Aperture plan 0,320 10 Lens 4 4,1305 (ASP) 0,191 plastic 1,697 16,3 -65,62 11 3,7165 (ASP) 0,276 12 Lens 5 1,2120 (ASP) 0,330 plastic 1,587 28,3 -6,09 13 0,8141 (ASP) 0,200 14 filter plan 0,210 Glass 1,517 64,2 - 15 plan 0,178 16 Picture plan - Note: Reference wavelength is 587.6 nm (d-line). The effective radius of aperture S1 (area 6) is 0.456 mm. The effective radius of aperture S2 (area 9) is 0.754 mm. Table 8B aspheric coefficients Area # 2 3 4 5 k = -2,30595E+00 -1,15972E+01 2,19854E+01 9,34341E+01 A4 = 4,571627183E-01 -1,008484801 E-01 3,861102349E-01 5,674305063E-01 A6 = 1,639805295E+00 -2,205396202E+00 5,987513139E+00 -1,800994500E+00 A8 = -3,169291870E+01 3,784939892E+01 -1,835388485E+02 9,376100097E+01 A10 = 3,363116589E+02 -4,679434845E+02 3,630989537E+03 -1,807153470E+03 A12 = -2,223982049E+03 3,328040388E+03 -4,392057092E+04 2,113352230E+04 A14 = 9,178361504E+03 -1,378938061E+04 3,373286596E+05 -1,564007026E+05 A16 = -2,305178173E+04 3,027763379E+04 -1,649223796E+06 7,356867109E+05 A18 = 3,163628700E+04 -2,325689549E+04 4,978202621 E+06 -2,126266667E+06 A20 = -1,804028468E+04 -1,057182291E+04 -8,449865992E+06 3,438107303E+06 A22 = - - 6,170465507E+06 -2,378849958E+06 Area # 7 8 10 11 k = -5,41559E+00 3,43282E+01 1,80595E+01 -9,90000E+01 A4 = -7,029652359E-01 -4,194695606E-01 -1,162772114E-01 -5,342677316E-02 A6 = 3,511533201E+00 -2,464549874E-02 -2,822939331E+00 -2,272486302E+00 A8 = -7,868522824E+01 1,171519386E+00 2,642228247E+01 2,820783920E+01 A10 = 8,298722106E+02 -1,229741068E+01 -1,211690865E+02 -1,754602919E+02 A12 = -5,028723496E+03 7,672732914E+01 4,530850068E+01 6,529220029E+02 A14 = 1,593142100E+04 -2,052968248E+02 2,060107515E+03 -1,611479177E+03 A16 = -2,080410099E+04 2,722602337E+02 -1,060561231E+04 2,770455505E+03 A18 = - - 2,742799266E+04 -3,393110288E+03 A20 = - - -4,236091580E+04 2,980125246E+03 A22 = - - 3,946910427E+04 -1,863842912E+03 A24 = - - -2,049236677E+04 8,107987335E+02 A26 = - - 4,555238303E+03 -2.334110344E+02 A28 = - - - 4.004296568E+01 A30 = - - - -3.106705171E+00 Area # 12 13 k = -3,09283E+01 -4,43928E+00 A4 = 3,566665526E-01 -4,418144917E-01 A6 = -8,241961845E+00 -2,826380979E-01 A8 = 3,836575207E+01 2,861587926E+00 A10 = -1,051840184E+02 -7,208938824E+00 A12 = 1,898481222E+02 1,099359143E+01 A14 = -2,364273926E+02 -1,157324370E+01 A16 = 2,095271674E+02 8,600012197E+00 A18 = -1,345319976E+02 -4,399763215E+00 A20 = 6,291812438E+01 1,435362499E+00 A22 = -2,126131628E+01 -2,287764389E-01 A24 = 5,062847033E+00 -1,848699353E-02 A26 = -8,065485360E-01 1,638757016E-02 A28 = 7,719390639E-02 -3,005259506E-03 A30 = -3,357171685E-03 1,982510539E-04

[0155] In the eighth 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 these parameters shown in Table 8C are also the same as those in the first embodiment, with corresponding values ​​for the eighth embodiment, so no further explanation is necessary.

[0156] Furthermore, these parameters from Table 8A and Table 8B can be calculated as the following values ​​and satisfy the following conditions: Table 8C schematic parameters f [mm] 2,25 f / f34 -0,01 Fno 2,01 |R2 / R4| 0,81 HFOV [Grade] 43,1 |R3 / R5| 0,55 FOV [degrees] 86,2 |R9 / R7| 0,29 TL / ImgH 1,15 (R4-R5) / (R4+R5) 0,02 ImgH / f 1,02 CT4 / CT5 0,58 TL / R7 0,64 CT5 / T34 0,90 TL / R8 0,71 T12 / T45 0,23 BL / T34 1,60 Dr1r6 / Dr6r10 0,76 |f / f2|+|f / f3|+|f / f4| 0,32 V2+V3+V4 53,9 |f1 / f2| 0,22 Y5R2 / Y3R2 2,86 |f5 / f3| 0,06 - - Ninth embodiment

[0157] Fig. Figure 17 shows a perspective view of an image acquisition unit according to the ninth 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 optical photography system, as disclosed in the first embodiment, a tube, and a retaining element (the reference numerals of which are omitted) for holding the optical photography system. However, the lens unit 101 can alternatively be provided with the optical photography system disclosed in other embodiments of the present disclosure, and the present disclosure is not limited thereto.The imaging light converges in the lens unit 101 of the image acquisition unit 100 to produce an image with the drive device 102, which is used for image focusing on the image sensor 103, and the generated image is then digitally transmitted to other electronic components for further processing.

[0158] The drive unit 102 can have an automatic focusing function, and various drive configurations can be achieved through the use of voice coil motors (VCMs), microelectromechanical systems (MEMS), piezoelectric systems, or shape-memory alloy materials. The drive unit 102 is advantageous for achieving a better imaging position of the lens unit 101, enabling the lens unit 101 to capture a clear image of the imaged object at various object distances. The image sensor 103 (e.g., CCD or CMOS), which can be characterized by high light sensitivity and low noise, is arranged on the image surface of the optical photography system to achieve higher image quality.

[0159] The image stabilizer 104, which may include an accelerometer, a gyroscope, and a Hall-effect sensor, is configured to work in conjunction with the drive unit 102 to provide optical image stabilization (OIS). The drive unit 102, working in conjunction with the image stabilizer 104, is advantageous for compensating for the panning and tilting of the lens unit 101 to reduce blurring associated with movement during shooting. In some cases, compensation can be achieved through electronic image stabilization (EIS) using image processing software, thereby improving image quality in motion or low-light conditions. Tenth embodiment

[0160] Fig. Figure 18 shows a perspective view of an electronic device according to the tenth embodiment as presented in the disclosure. Fig. Figure 19 shows a different perspective view of the electronic device in Fig. 18.

[0161] In this embodiment, an electronic device 200 is a smartphone with an image acquisition unit 100, an image acquisition unit 100a, an image acquisition unit 100b, an image acquisition unit 100c and a display unit 201 as disclosed in the ninth embodiment. As in Fig. As shown in Figure 18, 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 19, the image acquisition unit 100c and the display unit 201 are arranged on the opposite side of the electronic device 200, so that the image acquisition unit 100c can be a front camera of the electronic device 200 for taking selfies, although the present disclosure is not limited to this. Furthermore, each of the image acquisition units 100a, 100b, and 100c can have the optical photography system according to the present disclosure and a configuration similar to that of the image acquisition unit 100. In particular, each of the image acquisition units 100a, 100b, and 100c can have a lens unit, a drive device, an image sensor, and an image stabilizer, and each of the lens units can have an optical photography system such as the optical photography system of the present disclosure, a tube, and a retaining element for holding the optical photography system.

[0162] 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 angles of view, so that the electronic device can have 200 different magnification ratios to meet the requirement of an optical zoom function. Furthermore, image capture unit 100c, as shown in Fig. As shown in Figure 19, the lens tube or lens elements in the image acquisition unit 100c may have one or more truncated edges at their outer diameter positions to conform to the non-circular opening. Therefore, it is advantageous to further reduce the length of the image acquisition unit 100c along a single axis, thereby reducing the overall size of the lens, increasing the area ratio of the display unit 201 to the electronic device 200, reducing the thickness of the electronic device 200, and achieving a compact overall module. In this embodiment, the electronic device 200 has several image acquisition units 100, 100a, 100b, and 100c; however, the present disclosure is not limited to the number and arrangement of the image acquisition units. Eleventh embodiment

[0163] Fig. Figure 20 shows a perspective view of an electronic device according to the eleventh embodiment as presented in the disclosure. Fig. Figure 21 shows a different perspective view of the electronic device in Fig. 20. Fig. 22 shows a block diagram of the electronic device in Fig. 20.

[0164] In this embodiment, an electronic device 300 is a smartphone comprising an 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 focus assist module 302, an image signal processor 303, a display module 304, and an image software processor 305, all as disclosed in the ninth embodiment. The image acquisition unit 100 and the image acquisition unit 100d are arranged on the same side of the electronic device 300. The focus assist module 302 can be a laser rangefinder or a ToF (Time of Flight) module, but the present disclosure is not limited to these.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 100h can be front cameras of the electronic device 300 for taking selfies, although the present disclosure is not limited to this. Furthermore, each of the image acquisition units 100d, 100e, 100f, and 100g can have the optical photography system according to the present disclosure and a configuration similar to that of 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 optical photography system such as the optical photography system of the present disclosure, a tube and a holding element for holding the optical photography system.

[0165] 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 angles of view, so that the electronic device 300 can have different magnification ratios to meet the requirement of an optical zoom function. In addition, image acquisition unit 100g can determine depth information with respect to the imaged object. In this embodiment, the electronic device 300 has multiple image acquisition units 100, 100d, 100e, 100f, and 100g; however, the present disclosure is not limited to the number and arrangement of the image acquisition units.

[0166] When a user takes pictures of an object 306, the light beams converge in the image acquisition unit 100 or the image acquisition unit 100d to produce images, and the flash module 301 is activated to supplement the lighting. 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 a conventional infrared beam or a laser beam. Furthermore, the light beams can converge in the image acquisition unit 100e, 100f, or 100g to produce images.The display module 304 can have a touchscreen, and the user can interact with the display module 304 and the image software processor 305, which has several functions for capturing images and completing image processing. Alternatively, the user can capture images using a physical button. The image processed by the image software processor 305 can be displayed on the display module 304. Twelfth embodiment

[0167] Fig. Figure 23 shows a perspective view of an electronic device according to the twelfth embodiment as presented in the disclosure.

[0168] 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 focus assist module, an image signal processor, a display module, and an image software processor (not shown), as disclosed in the ninth 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 can include the optical photography system according to the present disclosure and a configuration similar to that of the image acquisition unit 100, and the details thereof are not repeated here.

[0169] The image acquisition unit 100 is an ultra-wide-angle image acquisition unit, the image acquisition unit 100h is a telephoto image acquisition unit, and the image acquisition unit 100i is a wide-angle image acquisition unit. In this embodiment, the image acquisition units 100, 100h, and 100i have different angles of view, so that the electronic device 400 can have different magnification ratios to meet the requirement of an 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 track length of the image acquisition unit 100h is not limited by the thickness of the electronic device 400. The light deflection element configuration of the image acquisition unit 100h can also be, for example, similar to one of those described in Fig. 27 to Fig. The structures shown in 29 refer to those described in the preceding sections. Fig. 27 to Fig. Reference can be made to Section 29, and the relevant details are not repeated here. In this embodiment, the electronic device 400 has several image acquisition units 100, 100h, and 100i; however, 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 beams converge in the image acquisition unit 100, 100h, or 100i to produce images, and the flash module 401 is activated to supplement the light. Furthermore, the subsequent processes are carried out in a similar manner to the aforementioned embodiment, so the relevant details are not repeated here. Thirteenth embodiment

[0170] Fig. Figure 24 shows a perspective view of an electronic device according to the thirteenth embodiment presented in the disclosure.

[0171] In this embodiment, an electronic device 500 is a smartphone comprising an image acquisition unit 100, an image acquisition unit 100j, an image acquisition unit 100h, 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 focus assist module, an image signal processor, a display module, and an image software processor (not shown). 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, 100h, 100m, 100n, 100p, 100q, 100r and 100s can have the optical photography system according to the present disclosure and a configuration similar to that of the image acquisition unit 100, and the details relating thereto are not repeated.

[0172] 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 100h 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 angles of view, so that the electronic device can have 500 different magnification ratios to meet the requirement of an 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. The light deflection element configuration of each of the 100i and 100k image acquisition units can also be, for example, similar to one of those in . Fig. 27 to Fig. The structures shown in 29 refer to those described in the preceding sections. Fig. 27 to Fig.Reference can be made to Section 29, and the relevant details are not repeated here. Furthermore, the image acquisition unit 100s can determine depth information regarding the imaged object. In this embodiment, the electronic device 500 has several 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 beams converge 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 supplement the lighting. Furthermore, the subsequent processes are carried out in a similar manner to the aforementioned embodiments, and the details relating thereto are not repeated.

[0173] The smartphone in several embodiments is merely an example illustrating 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 used with an optical system featuring a movable focus. Furthermore, the optical photography system of the image acquisition unit is characterized by good aberration correction capability and high image quality and can be used for 3D (three-dimensional) image acquisition applications in products such as digital cameras, mobile devices, digital tablets, smart TVs, network surveillance devices, dashboard cameras, vehicle reversing cameras, multi-camera devices, image recognition systems, motion-detecting input devices, portable devices, and other electronic imaging devices.

[0174] The foregoing description has been provided for illustrative purposes with reference to specific embodiments. It should be noted that Tables 1A-8C 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, thereby enabling other skilled persons to make the best possible use of the disclosure and various embodiments with different modifications suitable for their respective uses. The embodiments described above and the accompanying drawings are exemplary and are not intended to be exhaustive or to limit the scope of this disclosure to the precise forms disclosed. Many modifications and variations are possible with regard to the teachings above.

Claims

[1] Optical photographic system comprising five lens elements (E1, E2, E3, E4, E5), wherein the five lens elements (E1, E2, E3, E4, E5) are arranged in the order from an object side to an image side along a ray path comprising a first lens element (E1), a second lens element (E2), a third lens element (E3), a fourth lens element (E4), and a fifth lens element (E5), and wherein each of the five lens elements (E1, E2, E3, E4 and E5) 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 object-side surface of the second lens element (E2) is concave in a paraxial region thereof, the fifth lens element (E5) has a negative refractive power and the image-side surface of the fifth lens element (E5) is concave in a paraxial region thereof; where an Abbe number of the second lens element (E2) is V2, an Abbe number of the third lens element (E3) is V3, an Abbe number of the fourth lens element (E4) is V4, and a central thickness of the fifth lens element (E5) is CT5, an axial distance between the third lens element (E3) and the fourth lens element (E4) is T34, a focal length of the optical recording system is f, a focal length of the second lens element (E2) is f2, a focal length of the third lens element (E3) is f3, a focal length of the fourth lens element (E4) is f4, and the following conditions are met: 40.0 <V2+V3+V4<80,0; 0.00 <CT5 / T34<1,00; and 0.00<|f / f2|+|f / f3|+|f / f4|<1.

00. [2] Optical photography system according to claim 1, wherein the object-side surface of the first lens element (E1) is convex in a paraxial region of the same, the image-side surface of the first lens element (E1) is concave in a paraxial region of the same, the image-side surface of the second lens element (E2) is convex in a paraxial region of the same, the image-side surface of the third lens element (E3) is convex in a paraxial region of the same, the object-side surface of the fifth lens element (E5) is convex in a paraxial region of the same, and the image-side surface of the fifth lens element (E5) has at least one critical point (C) in an off-axis region of the same. [3] Optical photography system according to claim 1, wherein a maximum image height of the optical photography system is ImgH, the focal length of the optical photography system is f, and the following condition is met: 0.90 <ImgH / f<1,20. [4] Optical photography 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 fourth lens element (E4) and the fifth lens element (E5) is T45, and the following condition is met: 0.10 <T12 / T45<0,60. [5] Optical photography system according to claim 1, wherein an axial distance between the object-side surface of the first lens element (E1) and the image-side surface of the third lens element (E3) is Dr1r6, an axial distance between the image-side surface of the third lens element (E3) and the image-side surface of the fifth lens element (E5) is Dr6r10, and the following condition is met: 0.20 <Dr1r6 / Dr6r10<1,00. [6] Optical photographic system according to claim 1, wherein a 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 second lens element (E2) is R4, and the following condition is met: 0.00<|R2 / R4|<1.

00. [7] Optical photography system according to claim 1, wherein a radius of curvature of the image-side surface of the second lens element (E2) is R4, a radius of curvature of the object-side surface of the third lens element (E3) is R5, and the following condition is met: −0.10<(R4−R5) / (R4+R5)<12.

00. [8] Optical photography 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 object-side surface of the fourth lens element (E4) is R7, and the following condition is met: -0.30 <TL / R7<1,40. [9] Optical photography system according to claim 1, wherein an axial distance between the image-side surface of the fifth lens element (E5) and an image surface (IMG) is BL, the axial distance between the third lens element (E3) and the fourth lens element (E4) is T34, a central thickness of the fourth lens element (E4) is CT4, the central thickness of the fifth lens element (E5) is CT5, and the following conditions are met: 0.40 <BL / T34<2,00; und 0.40 <CT4 / CT5<1,40. [10] Image capture unit (100) which has: the optical photography system according to claim 1; and an image sensor (103) which is arranged on the image area (IMG) of the optical photography system. [11] Electronic device (200) comprising: the image acquisition unit (100) according to claim 10. [12] Optical photographic system comprising five lens elements (E1, E2, E3, E4, E5), wherein the five lens elements (E1, E2, E3, E4, E5) are arranged in the order from an object side to an image side along a ray path comprising a first lens element (E1), a second lens element (E2), a third lens element (E3), a fourth lens element (E4), and a fifth lens element (E5), and wherein each of the five lens elements (E1, E2, E3, E4 and E5) 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 image-side surface of the second lens element (E2) is convex in a paraxial region of the same, the image-side surface of the third lens element (E3) is convex in a paraxial region of the same, the object-side surface of the fifth lens element (E5) is convex in a paraxial region of the same, and the object-side surface of the fifth lens element (E5) has at least one inflection point (P); where an Abbe number of the second lens element (E2) is V2, an Abbe number of the third lens element (E3) is V3, an Abbe number of the fourth lens element (E4) is V4, and a central thickness of the fifth lens element (E5) is CT5, an axial distance between the first lens element (E1) and the second lens element (E2) is T12, an axial distance between the third lens element (E3) and the fourth lens element (E4) is T34, an axial distance between the fourth lens element (E4) and the fifth lens element (E5) is T45, and the following conditions are met: 30.0 <V2+V3+V4<90,0; 0.00 <CT5 / T34<1,00; and 0.00 <T12 / T45<0,70. [13] Optical photography system according to claim 12, wherein the object-side surface of the first lens element (E1) is convex in a paraxial region of the same, the image-side surface of the first lens element (E1) is concave in a paraxial region of the same, the object-side surface of the second lens element (E2) is concave in a paraxial region of the same, the fifth lens element (E5) has a negative refractive power and the image-side surface of the fifth lens element (E5) is concave in a paraxial region of the same. [14] Optical photography system according to claim 12, wherein 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 optical photography system is ImgH, a maximum effective radius of the image-side surface of the third lens element (E3) is Y3R2, a maximum effective radius of the image-side surface of the fifth lens element (E5) is Y5R2 and the following conditions are met: 0.80 <TL / ImgH<1,30; und 2.00 <Y5R2 / Y3R2<4,50. [15] Optical photography system according to claim 12, 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: -0.20 <TL / R8<1,30. [16] Optical photography system according to claim 12, wherein a focal length of the optical photography system is f, a focal length of the third lens element (E3) is f3, a focal length of the fifth lens element (E5) is f5, a combined focal length of the third lens element (E3) and the fourth lens element (E4) is f34, and the following conditions are met: 0.00 ≤ |f5 / f3| < 1.00; and -0.50 <f / f34<0,40. [17] Optical photography system according to claim 12, wherein the axial distance between the third lens element (E3) and the fourth lens element (E4) is a maximum value among the axial distances between each of all adjacent lens elements of the optical photography system; wherein a focal length of the first lens element (E1) is f1, a focal length of the second lens element (E2) is f2, and the following condition is satisfied: 0,00<|f1 / f2|<1,00. [18] Optical photography system according to claim 12, wherein a focal length of the optical photography system is f, a focal length of the second lens element (E2) is f2, a focal length of the third lens element (E3) is f3, a focal length of the fourth lens element (E4) is f4, the Abbe number of the second lens element (E2) is V2, the Abbe number of the third lens element (E3) is V3, the Abbe number of the fourth lens element (E4) is V4, and the following conditions are met: 0.10<|f / f2|+|f / f3|+|f / f4|<0.80; and 35.0 <V2+V3+V4<85,0. [19] Optical photography system according to claim 12, wherein a radius of curvature of the object-side surface of the second lens element (E2) is R3, a radius of curvature of the object-side surface of the third lens element (E3) is R5, a radius of curvature of the object-side surface of the fourth lens element (E4) is R7, a radius of curvature of the object-side surface of the fifth lens element (E5) is R9, and the following conditions are met: 0.00 <|R9 / R7| <1.10; and 0.00<|R3 / R5|<1.

10. [20] Optical photography system according to claim 12, wherein the Abbe number of the second lens element (E2) is V2, the Abbe number of the third lens element (E3) is V3, the Abbe number of the fourth lens element (E4) is V4, the central thickness of the fifth lens element (E5) is CT5, the axial distance between the first lens element (E1) and the second lens element (E2) is T12, the axial distance between the third lens element (E3) and the fourth lens element (E4) is T34, the axial distance between the fourth lens element (E4) and the fifth lens element (E5) is T45, a focal length of the optical photography system is f, a focal length of the second lens element (E2) is f2, a focal length of the third lens element (E3) is f3, a focal length of the fourth lens element (E4) is f4, and the following conditions are met: 48.9≤V2+V3+V4≤76.4; 0.46≤CT5 / T34≤0.90; 0.20≤T12 / T45≤0.40; and 0.20≤|f / f2|+|f / f3|+|f / f4|≤0.72.

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