Optical imaging lens system, image acquisition unit and electronic device

Abstract

Optical imaging lens system comprising seven optical elements (E1, E2, E3, E4, E5, E6, E7), wherein the seven optical elements (E1, E2, E3, E4, E5, E6, E7) are arranged in the order from an object side to an image side along a beam path as a first optical element (E1), a second optical element (E2), a third optical element (E3), a fourth optical element (E4), a fifth optical element (E5), a sixth optical element (E6) and a seventh optical element (E7), and each of the seven optical elements (E1, E2, E3, E4, E5, E6, E7) has an object-side surface facing the object side and an image-side surface facing the image side;wherein the first optical element (E1) is a reflective element, the first optical element (E1) further comprising a reflective surface (RF1) arranged between the object-side surface and the image-side surface of the first optical element (E1), and each from the second optical element (E2) to the seventh optical element (E7) being a lens element; wherein the first optical element (E1) has a positive refractive power, the object-side surface of the first optical element (E1) is convex in a paraxial region thereof, the third optical element (E3) has a negative refractive power, the object-side surface of the seventh optical element (E7) is convex in a paraxial region thereof, and at least one inflection point (P) between the object-side surface and the image-side surface of the seventh optical element (E7) has;where TL is an axial distance between the object-side surface of the first optical element (E1) and an image surface (IMG), CT1 is a central thickness of the first optical element (E1), CT2 is a central thickness of the second optical element (E2), R13 is a radius of curvature of the object-side surface of the seventh optical element (E7), R14 is a radius of curvature of the image-side surface of the seventh optical element (E7), T12 is an axial distance between the first optical element (E1) and the second optical element (E2), f is a focal length of the optical imaging lens system, f2 is a focal length of the second optical element (E2), and the following conditions are met: 1.30 < (TL − CT1) / CT1 < 3.00; 0.60 < |R13 / R14| < 3.00; 0.05 <CT2 / T12<3,00;und−0,80<f / f2<2,80.;

Description

BACKGROUND field of expertise The present disclosure relates to an optical imaging lens system, an image acquisition unit and an electronic device, in particular an optical imaging lens system and an image acquisition unit that can be used in an electronic device. Description of related technology With the development of semiconductor manufacturing technology, the performance of image sensors has improved, and their pixel size has decreased. Therefore, high image quality has become an indispensable feature of an optical system today. Furthermore, due to rapid technological advancements, electronic devices equipped with optical systems are increasingly becoming multifunctional for various applications, thus raising the bar for the functionality of these systems. However, for a conventional optical system, it is challenging to balance requirements such as high image quality, low sensitivity, a suitable aperture, miniaturization, and a desirable field of view. Therefore, the present disclosure provides an optical system that incorporates optical axis redirection capabilities and achieves high image quality for both telephoto and macro photography through lens movement design, thereby meeting market demands and enhancing photographic flexibility. Especially in recent years, the trend in electronic products has been towards lightweight and thin designs, making it difficult for conventional camera lenses to simultaneously meet the demands of high performance and miniaturization, particularly for small lenses with large apertures, telephoto capabilities, or similar features. Conventional telephoto lenses can no longer meet these technological requirements and therefore suffer from problems such as excessive overall length, insufficient aperture, inadequate quality, and a lack of miniaturization. Therefore, alternative optical features or a configuration with a deflected optical axis must be introduced to overcome these problems. SUMMARY According to one aspect of the present disclosure, an optical imaging lens system comprises seven optical elements. The seven optical elements are, in order from an object side to an image side along a beam path, a first optical element, a second optical element, a third optical element, a fourth optical element, a fifth optical element, a sixth optical element, and a seventh optical element. Each of the seven optical elements has an object-side surface facing the object side and an image-side surface facing the image side. Preferably, the first optical element is a reflective element. Preferably, the first optical element further comprises a reflective surface arranged between the object-side surface and the image-side surface of the first optical element. Preferably, each of the second lens elements up to the seventh lens element is a lens element. Preferably, the first optical element has a positive refractive power. Preferably, the object-side surface of the first optical element is convex in a paraxial region thereof. Preferably, the third optical element has a negative refractive power. Preferably, the object-side surface of the seventh optical element is convex in a paraxial region thereof. Preferably, at least one of the object-side surfaces and the image-side surface of the seventh optical element has at least one inflection point. If an axial distance between the object-side surface of the first optical element and an image surface TL is, a central thickness of the first optical element CT1 is, a central thickness of the second optical element CT2 is, a radius of curvature of the object-side surface of the seventh optical element R13 is, a radius of curvature of the image-side surface of the seventh optical element R14 is, an axial distance between the first optical element and the second optical element T12 is, a focal length of the imaging lens system f is, and a focal length of the second optical element f2 is, then the following conditions are preferably met: and According to another aspect of the present disclosure, an optical imaging lens system comprises seven optical elements. The seven optical elements are, in order from an object side to an image side along a beam path, a first optical element, a second optical element, a third optical element, a fourth optical element, a fifth optical element, a sixth optical element, and a seventh optical element. Each of the seven optical elements has an object-side surface facing the object side and an image-side surface facing the image side. Preferably, the first optical element is a reflective element. Preferably, the first optical element further comprises a reflective surface arranged between the object-side surface and the image-side surface of the first optical element. Preferably, each of the second to the seventh optical element is a lens element. Preferably, the first optical element has a positive refractive power. Preferably, the object-side surface of the first optical element is convex in a paraxial region. Preferably, the third optical element has a negative refractive power. Preferably, the object-side surface of the seventh optical element is convex in a paraxial region. Preferably, the image-side surface of the seventh optical element is concave in a paraxial region.Preferably, the image-side surface of the seventh optical element has at least one critical point in an off-axis region thereof. If an axial distance between the object-side surface of the first optical element and an image surface is TL, a central thickness of the first optical element is CT1, a central thickness of the fourth optical element is CT4, a radius of curvature of the object-side surface of the fourth optical element is R7, a radius of curvature of the image-side surface of the fourth optical element is R8, an Abbe number of the sixth optical element is V6, an Abbe number of the seventh optical element is V7, and an axial distance between the third optical element and the fourth optical element is T34, then the following conditions are preferably satisfied: and According to another aspect of the present disclosure, an image acquisition unit comprises one of the aforementioned optical imaging lens systems and an image sensor, wherein the image sensor is arranged on the image surface of the optical imaging lens system. According to another aspect of the present disclosure, an electronic device comprises an image acquisition unit, wherein the image acquisition unit comprises one of the aforementioned optical imaging lens systems and an image sensor, and the image sensor is arranged on the image surface of the optical imaging lens system. BRIEF DESCRIPTION OF THE DRAWINGS The disclosure can be better understood by reading the following detailed description of the embodiments with reference to the accompanying drawings: Fig. 1 is a schematic view of an image acquisition unit corresponding to a long distance and a short distance according to the first embodiment of the present disclosure; Fig. 2 shows spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit corresponding to the long distance according to the first embodiment; Fig. 3 shows spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit corresponding to the short distance according to the first embodiment; Fig. 4 is a schematic view of an image acquisition unit corresponding to a long distance and a short distance according to the second embodiment of the present disclosure; Fig.Figure 5 shows spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit corresponding to the long distance according to the second embodiment; Figure 6 shows spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit corresponding to the short distance according to the second embodiment; Figure 7 is a schematic view of an image acquisition unit corresponding to a long distance and a short distance according to the third embodiment of the present disclosure; Figure 8 shows spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit corresponding to the long distance according to the third embodiment; Figure 9 shows spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit corresponding to the short distance according to the third embodiment; FigureFigure 10 is a schematic view of an image acquisition unit corresponding to a long distance and a short distance according to the 4th embodiment of the present disclosure; Figure 11 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit corresponding to the long distance according to the 4th embodiment; Figure 12 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit corresponding to the short distance according to the 4th embodiment; Figure 13 is a schematic view of an image acquisition unit corresponding to a long distance and a short distance according to the 5th embodiment of the present disclosure; Figure 14 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit corresponding to the long distance according to the 5th embodiment; FigureFigure 15 shows spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit corresponding to the short distance according to the 5th embodiment; Figure 16 is a schematic view of an image acquisition unit corresponding to a long distance and a short distance according to the 6th embodiment of the present disclosure; Figure 17 shows spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit corresponding to the long distance according to the 6th embodiment; Figure 18 shows spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit corresponding to the short distance according to the 6th embodiment; Figure 19 is a schematic view of an image acquisition unit corresponding to a long distance and a short distance according to the 7th embodiment of the present disclosure; FigureFigure 20 shows spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit corresponding to the long distance according to the 7th embodiment; Figure 21 shows spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit corresponding to the short distance according to the 7th embodiment; Figure 22 is a schematic view of an image acquisition unit corresponding to a long distance and a short distance according to the 8th embodiment of the present disclosure; Figure 23 shows spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit corresponding to the long distance according to the 8th embodiment; Figure 24 shows spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit corresponding to the short distance according to the 8th embodiment; FigureFigure 25 is a perspective view of an image acquisition unit according to the 9th embodiment of the present disclosure; Figure 26 is a perspective view of an electronic device according to the 10th embodiment of the present disclosure; Figure 27 is another perspective view of the electronic device from Figure 26; Figure 28 is a perspective view of an electronic device according to the 11th embodiment of the present disclosure; Figure 29 is another perspective view of the electronic device from Figure 28; Figure 30 is a block diagram of the electronic device from Figure 28; Figure 31 is a perspective view of an electronic device according to the 12th embodiment of the present disclosure; Figure 32 shows a schematic view of inflection points on lens surfaces, critical points on lens surfaces, and Yc71 according to the 1st embodiment of the present disclosure; FigureFigure 33 shows a schematic view of CT1, T12, TL, SAG2R1, SAG3R2, SAG6R1, Y1R1 and Y7R1 according to the first embodiment of the present disclosure; Figure 34 shows a schematic view of an aperture diaphragm shape according to an embodiment of the present disclosure; Figure 35 shows a schematic view of another aperture diaphragm shape according to an embodiment of the present disclosure; Figure 36 shows a schematic view of a configuration of a reflecting element in an optical imaging lens system according to an embodiment of the present disclosure; and Figure 37 shows a schematic view of a combination of the reflecting element according to an embodiment of the present disclosure. DETAILED DESCRIPTION An optical imaging lens system comprises seven optical elements. These seven optical elements, in order from an object side to an image side along a beam path, are a first optical element, a second optical element, a third optical element, a fourth optical element, a fifth optical element, a sixth optical element, and a seventh optical element. Each of the seven optical elements has an object-side surface facing the object side and an image-side surface facing the image side. The first optical element is a reflective element. Each of the second to the seventh optical element is a lens element. The optical imaging lens system has a first state and a second state, the first state relating to a state of the optical imaging lens system with an imaged object at a great distance, and the second state relating to a state of the optical imaging lens system with an imaged object at a short distance. In the optical imaging lens system disclosed in the present disclosure, an object distance refers to an axial distance between the imaged object and the object-side surface of the first optical element. The great distance refers to a state of the optical imaging lens system with an object distance of 5000 millimeters or more, which in the embodiments is, by way of example, infinity. However, the present disclosure is not limited to this.The short distance refers to a state of the optical imaging lens system with an object distance of 1000 millimeters or less, although the short distance is not limited to the object distance disclosed in the embodiments. The object distance can be adjusted as required. Furthermore, the long distance can refer to a state of the optical imaging lens system with an object distance of more than 10000 millimeters, and the short distance can refer to a state of the optical imaging lens system with an object distance of 800 millimeters or less.When the imaged object moves from a long distance to a short distance, at least two lens elements of the optical imaging lens system move along an optical axis relative to other lens elements of the optical imaging lens system to perform a focusing operation to correspond to different object distances, thus transitioning the optical imaging lens system from the first state to the second state. The optical imaging lens system can perform the focusing operation to capture an image of an object at any object distance in the range from long distance to short distance. See Fig. 1, which shows a schematic view of an optical imaging lens system of an image acquisition unit in the first state (focusing on the long distance) and in the second state (focusing on the short distance) according to Figure 1.An embodiment of the present disclosure is shown. The upper part of Fig. 1 shows the optical imaging lens system in the first state, and the lower part of Fig. 1 shows the optical imaging lens system in the second state. Furthermore, during the focusing process, at least two lens elements move along an optical axis direction relative to other lens elements of the optical imaging lens system. This is advantageous for enabling a specific range of telephoto and macro photography of the optical imaging lens system, thereby improving its performance and extending its range of applications. Moreover, one of the at least two lens elements that move during the focusing process is the seventh optical element.Therefore, it is advantageous to ensure excellent flexible spatial arrangement of the mechanism and other assemblies during the focusing process and to simplify the design of the mechanism as well as the assembly effort. The first optical element has a positive refractive power. Therefore, it is advantageous for reducing the overall size and controlling the angle of view. The object-side surface of the first optical element is convex in a paraxial region. This makes it advantageous for use at different object distances by ensuring that light can be received from the object-side surface of the reflecting element and increasing the amount of incident light. The first optical element has a reflecting surface positioned between its object-side surface and its image-side surface.The beam path can be reflected at least once through the reflective surface of the reflecting element, allowing the optical imaging lens system to be designed more flexibly in its spatial arrangement, thereby reducing mechanical limitations and miniaturizing the imaging lens system. The third optical element has a negative refractive power. Therefore, it is advantageous for improving light scattering, thus facilitating the formation of a long focal length structure in the imaging lens system. The object-side surface of the third optical element is convex in a paraxial region. Therefore, it is advantageous for adjusting the refractive power of the third optical element to correct spherical aberration. The image-side surface of the third optical element is concave in a paraxial region. Therefore, it is advantageous for adjusting the light exit direction from the third optical element, thereby compensating for beam path misalignment and correcting aberration. The object-side surface of the fourth optical element is convex in a paraxial region. Therefore, it is advantageous to provide adequate focusing capability on the object-side surface of the fourth optical element in order to reduce the size of the optical imaging lens system. The sixth optical element has a positive refractive power. Therefore, it is advantageous for balancing the overall refractive power configuration and reducing the size at the image end of the optical imaging lens system. The object-side surface of the seventh optical element is convex in a paraxial region. This is advantageous for compensating for the focusing of light from different object distances, thus improving image quality. The image-side surface of the seventh optical element is concave in a paraxial region. This is advantageous for adjusting the light exit direction from the seventh optical element, which in turn is beneficial for increasing the image area and maintaining a suitable rear focal length. According to the present disclosure, at least one of the object-side surface and the image-side surface of the seventh optical element has at least one inflection point. Therefore, this is advantageous for increasing the flexibility of the optical design, which in turn is advantageous for correcting off-axis aberrations. See Fig.32, which shows a schematic view of inflection points P on the object-side surface of the seventh optical element E7 and the image-side surface of the seventh optical element E7, as well as inflection points P on the object-side surface of the second optical element E2, the image-side surface of the second optical element E2, the object-side surface of the third optical element E3, the image-side surface of the third optical element E3, the image-side surface of the fourth optical element E4, the object-side surface of the fifth optical element E5, the image-side surface of the fifth optical element E5, the object-side surface of the sixth optical element E6 and the image-side surface of the sixth optical element E6, wherein the optical imaging lens system according to the 1st embodiment of the present disclosure focuses on the long distance.The one or more inflection points P mentioned above on any lens surface of the second to seventh optical elements in Fig. 32 are only examples. Each of the lens surfaces in different embodiments of the present disclosure can also have one or more inflection points. According to the present disclosure, at least one of the object-side and image-side surfaces of the seventh optical element has at least one critical point in an off-axis region thereof. Furthermore, the image-side surface of the seventh optical element can have at least one critical point in an off-axis region thereof. Therefore, it is advantageous for controlling the beam path at the edge of the seventh optical element, thereby correcting distortion and field curvature. See Fig.Figure 32 shows a schematic view of critical points C on the object-side surface of the seventh optical element E7, the image-side surface of the seventh optical element E7, and critical points C on the object-side surface of the second optical element E2, the image-side surface of the second optical element E2, the object-side surface of the third optical element E3, the object-side surface of the fifth optical element E5, the image-side surface of the fifth optical element E5, and the object-side surface of the sixth optical element E6, wherein the optical imaging lens system according to the first embodiment of the present disclosure is focused at a long distance. The one or more critical points C mentioned above on any lens surface of the second to seventh optical elements in Figure 32 are only examples.Each of the lens surfaces in various embodiments of the present disclosure may also have one or more critical points in an off-axial region thereof. According to the present disclosure, the inflection points and the critical points are calculated only within the optically effective area of ​​an optical element (reflecting element and lens element). According to the present disclosure, the optical imaging lens system may further comprise an aperture diaphragm. Furthermore, the aperture diaphragm may have a principal axis direction and a minor axis direction that are perpendicular to and differ from the optical axis, and an effective radius of the aperture diaphragm in the principal axis direction differs from an effective radius of the aperture diaphragm in the minor axis direction. Therefore, it is advantageous to adapt the shape of the aperture diaphragm to reduce stray light. See, for example, Figs. 34 and 35, which show schematic views of non-circular aperture diaphragms according to the present disclosure, with Fig. 34 showing a schematic view of one shape of an aperture diaphragm according to one embodiment of the present disclosure and Fig. 35 showing a schematic view of another shape of an aperture diaphragm according to one embodiment of the present disclosure. As in Fig.As shown in Figure 34, in some configurations of the present disclosure, an aperture diaphragm ST has an elliptical shape, and the aperture diaphragm ST has a principal axis direction LX and a minor axis direction SY that are perpendicular to an optical axis OA. The principal axis direction LX and the minor axis direction SY are two distinct directions, and an effective radius Ra of the aperture diaphragm ST in the principal axis direction LX is larger than an effective radius Rb of the aperture diaphragm ST in the minor axis direction SY. As shown in Figure 35, in some other configurations of the present disclosure, an aperture diaphragm ST is shaped such that it has chamfered edges on an outer circumference, and the aperture diaphragm ST has a principal axis direction LX and a minor axis direction SY that are perpendicular to an optical axis OA.The principal axis direction LX and the minor axis direction SY are two different directions, and an effective radius Ra of the aperture diaphragm ST in the principal axis direction LX is larger than an effective radius Rb of the aperture diaphragm ST in the minor axis direction SY. According to the present disclosure, in addition to the aforementioned aperture diaphragm, at least one element can have a non-circular optically effective area. In particular, the lens tube or the optical elements can be truncated to reduce the length along a single axis. This is therefore advantageous for reducing the size of the lens, thereby miniaturizing the module. The truncated element can, for example, have the truncated edges shown in Fig. 35, which will not be discussed again here. According to the present disclosure, the first optical element is a prism. Therefore, it is advantageous to support the optical image stabilization of the imaging lens system and to effectively improve the durability and structural strength of the product. See Fig. 36, which shows a schematic view of a configuration of the first optical element in an image acquisition unit according to the first embodiment of the present disclosure. As shown in Fig.As shown in Figure 36, a beam path can, in the sequence from an imaged object (not shown in the figure) to an image surface IMG of the imaging lens system, enter a first optical element E1 through an object-side surface E1R1 of the first optical element E1, be reflected from a reflecting surface RF1 of the first optical element E1, pass through an image-side surface E1R2 of the first optical element E1, a second optical element E2, a third optical element E3, a fourth optical element E4, a fifth optical element E5, a sixth optical element E6, a seventh optical element E7 and a filter E8 along a second optical axis OA2 and then extend to the image surface IMG. According to the present disclosure, the angle between the normal direction of the reflecting surface and the optical axis is not limited to the 45 degrees shown in Fig. 36. Other angles can be chosen according to actual requirements, such as the spatial arrangement. According to the present disclosure, the optical surface of the reflecting element can be a planar surface, a spherical surface, an aspherical surface or a freeform surface, depending on the requirements of the optical design, although the present disclosure is not limited thereto. To reduce the size of the optical imaging lens system, the length, width, and height of the reflecting element can differ from one another. Furthermore, the angle between a vector of the optical axis at the object end and the vector at the image end can be any angle and is not limited to 0 degrees, 90 degrees, or 180 degrees. According to the present disclosure, the reflective element can be formed in one piece or consist of more than one prism, depending on the design requirements. Furthermore, the prism can be made of glass or plastic, depending on the design requirements. It should be noted that the first optical element mentioned above can be a single refractive prism, but the present disclosure is not limited to this. The first optical element can also be a reflective element arrangement consisting of a lens element and a prism cemented together, or a reflective element arrangement consisting of two lens elements and a prism cemented together, but the present disclosure is not limited to such a combination.Furthermore, the lens element and the prism in the aforementioned reflective element arrangement can be made of the same or different materials. See Fig. 37, which shows a schematic view of a combination of the reflective element according to the present disclosure. As shown in Fig. 37, the first optical element E1 is a reflective element consisting of two lens elements LS1 and LS2 and a prism PR, which are cemented together by a cemented adhesive layer CML. If the axial distance between the object-side surface of the first optical element and an image surface TL is and the central thickness of the first optical element is CT1, the following condition can be satisfied: 1.30 < (TL-CT1) / CT1 < 3.00. Therefore, this is advantageous for controlling the overall path length of the optical imaging lens system and facilitates the spatial arrangement of the mechanism and other assemblies. Furthermore, the following conditions can also be satisfied: 1.40 < (TL-CT1) / CT1 < 2.60. Furthermore, the following conditions can also be satisfied: 1.50 < (TL-CT1) / CT1 < 2.40. Furthermore, the following condition can also be satisfied: 1.70 ≤ (TL-CT1) / CT1 ≤ 2.08. See Fig. 33, which shows a schematic view of CT1 and TL according to the first embodiment of the present disclosure. If the radius of curvature of the object-side surface of the seventh optical element is R13 and the radius of curvature of the image-side surface of the seventh optical element is R14, the following condition can be satisfied: 0.60 < |R13 / R14| < 3.00. Therefore, it is advantageous to adjust the lens shape and refractive power of the seventh optical element to support the balance of the posterior focal length and thereby correct astigmatism and field curvature. Furthermore, the following condition can also be satisfied: 0.75 < |R13 / R14| < 2.80. Additionally, the following condition can also be satisfied: 0.90 < |R13 / R14| < 2.50. Furthermore, the following condition can also be satisfied: 1.04 ≤ |R13 / R14| ≤ 1.83. If the central thickness of the second optical element is CT2 and the axial distance between the first and second optical elements is T12, the following condition can be met: 0.05 < CT2 / T12 < 3.00. Therefore, adjusting the central thickness of the second optical element is advantageous to effectively control the distance between the first and second optical elements, thus preventing collisions and effectively increasing the assembly yield. Furthermore, the following conditions can also be met: 0.10 < CT2 / T12 < 2.80. Furthermore, the following conditions can also be met: 0.15 < CT2 / T12 < 2.50. Furthermore, the following conditions can also be met: 0.25 < CT2 / T12 < 1.80. Furthermore, the following condition can also be met: 0.37 ≤ CT2 / T12 ≤ 1.17. See Fig. 33, which shows a schematic view of T12 according to the 1st embodiment of the present disclosure. If the focal length of the optical imaging lens system is f and the focal length of the second optical element is f2, the following condition can be satisfied: -0.80 < f / f2 < 2.80. Therefore, it is advantageous to correct spherical aberrations of the optical imaging lens system by adjusting the refractive power of the second optical element. Furthermore, the following conditions can also be satisfied: -0.30 < f / f2 < 2.50. Additionally, the following conditions can also be satisfied: -0.20 < f / f2 < 2.20. Furthermore, the following condition can also be satisfied: -0.07 ≤ f / f2 ≤ 1.85. If the radius of curvature of the object-side surface of the fourth optical element is R7 and the radius of curvature of the image-side surface of the fourth optical element is R8, the following condition can be satisfied: -0.60 < (R7+R8) / (R7-R8) < 2.50. Therefore, this is advantageous for optimizing the light path within the fourth optical element, thereby improving image quality and preserving the spatial perception of the scene as seen by the photographer. Furthermore, the following conditions can also be satisfied: -0.50 < (R7+R8) / (R7-R8) < 2.00. Additionally, the following conditions can also be satisfied: -0.30 < (R7+R8) / (R7-R8) < 1.70. Furthermore, the following condition can also be satisfied: -0.20 < (R7+R8) / (R7-R8) < 0.60. Furthermore, the following condition can also be met: 0.12 ≤ (R7+R8) / (R7-R8) ≤ 1.37. If the Abbe number of the sixth optical element is V6 and the Abbe number of the seventh optical element is V7, the following condition can be met: 0.10 < V6 / V7 < 1.40. Therefore, it is advantageous to adjust the material distribution of the lens elements and correct the chromatic aberration produced by the optical imaging lens system, thereby preventing overlapping images and improving image quality. Furthermore, the following conditions can also be met: 0.15 < V6 / V7 < 0.90. Furthermore, the following conditions can also be met: 0.20 < V6 / V7 < 0.80. Furthermore, the following conditions can also be met: 0.25 < V6 / V7 < 0.75. Furthermore, the following condition can also be met: 0.36 ≤ V6 / V7 ≤ 0.57. If the axial distance between the third and fourth optical elements is T34 and the central thickness of the fourth optical element is CT4, the following condition can be satisfied: 0 < T34 / CT4 < 0.90. Therefore, it is advantageous to adjust the distance between the third and fourth optical elements, as well as the central thickness of the fourth optical element, to reduce the overall size and correct aberrations. Furthermore, the following conditions can also be satisfied: 0.05 < T34 / CT4 < 0.80. Furthermore, the following conditions can also be satisfied: 0.10 < T34 / CT4 < 0.65. Furthermore, the following conditions can also be satisfied: 0.15 < T34 / CT4 < 0.50. Furthermore, the following condition can also be satisfied: 0.22 ≤ T34 / CT4 ≤ 0.36. If the f-number of the optical imaging lens system is Fno, the following condition can be met: 1.30 < Fno < 2.80. Therefore, it is advantageous for balancing depth of field and illumination intensity, as well as for increasing the amount of light entering the lens to improve image quality. Furthermore, the following conditions can also be met: 1.40 < Fno < 2.70. Additionally, the following conditions can also be met: 1.50 < Fno < 2.60. Furthermore, the following condition can also be met: 1.68 ≤ Fno ≤ 2.36. If the focal length of the optical imaging lens system is f, and the combined focal length of the second, third, and fourth optical elements is f234, then the following condition can be satisfied: -0.30 < f / f234 < 2.50. Therefore, it is advantageous for controlling the light focusing and scattering capabilities of the optical imaging lens system at its front end, which is beneficial for harmonizing the beam path and controlling the overall path length. Furthermore, the following conditions can also be satisfied: 0 < f / f234 < 2.30. Additionally, the following condition can also be satisfied: 0.60 < f / f234 < 2.10. If the central thickness of the second optical element is CT2 and the central thickness of the third optical element is CT3, the following condition can be met: 0.15 < CT2 / CT3 < 1.80. Therefore, it is advantageous to control the ratio of the central thicknesses of the second optical element to the third optical element, which is beneficial for accommodating manufacturing constraints of the lens elements while simultaneously reducing manufacturing tolerances. Furthermore, the following conditions can also be met: 0.25 < CT2 / CT3 < 1.60. Additionally, the following condition can also be met: 0.35 < CT2 / CT3 < 1.20. If the axial distance between the object-side surface of the first optical element and the image-side surface of the seventh optical element is TD, and the maximum image height of the optical imaging lens system is ImgH, the following condition can be met: 3.00 < TD / ImgH < 4.50. Therefore, it is advantageous to reduce the overall size and increase the image area while maintaining a long focal length structure, thus achieving a superior product specification. Furthermore, the following condition can also be met: 3.30 < TD / ImgH < 4.40. Additionally, the following condition can also be met: 3.63 ≤ TD / ImgH ≤ 4.13. If the maximum field of view (FOV) of the optical imaging lens system is 18.0 degrees, the following condition can be met: FOV < 50.0 degrees. Therefore, it is advantageous to have a suitable viewing angle for the optical imaging lens system to meet the requirements of the product application. Furthermore, the following condition can also be met: FOV < 45.0 degrees. Additionally, the following condition can also be met: FOV < 30.0 degrees ≤ 39.80 degrees. If the axial distance between the object-side surface of the first optical element and the image surface of the optical imaging lens system focused at long distances is TLi, and the axial distance between the object-side surface of the first optical element and the image surface of the optical imaging lens system focused at short distances is TLm, then the following condition can be satisfied: 0 ≤ |TLi-TLm| / TLi < 2.0E-3. Therefore, it is advantageous to achieve space savings and simplify the mechanism design while enabling telephoto and macro photography with the optical imaging lens system. Furthermore, the following condition can also be satisfied: 0 ≤ |TLi-TLm| / TLi < 1.0E-3. If the focal length of the optical imaging lens system is f and the focal length of the fourth optical element is f4, the following condition can be met: 0.70 < f / f4 < 3.10. Therefore, adjusting the refractive power of the fourth optical element is advantageous, which reduces the size and sensitivity of the optical imaging lens system. Furthermore, the following conditions can also be met: 0.90 < f / f4 < 2.90. Additionally, the following condition can also be met: 1.20 < f / f4 < 2.60. If the central thickness of the first optical element is CT1, the central thickness of the second optical element is CT2, the central thickness of the third optical element is CT3, the central thickness of the fourth optical element is CT4, the central thickness of the fifth optical element is CT5, the central thickness of the sixth optical element is CT6, and the central thickness of the seventh optical element is CT7, then the following condition can be met: 0.50 < (CT2+CT3+CT4+CT5+CT6+CT7) / CT1 < 1.40. Therefore, this is advantageous for the spatial balance of the optical imaging lens system and for maintaining high light focusing quality over a wide range of object distances. Furthermore, the following condition can also be met: 0.55 < (CT2+CT3+CT4+CT5+CT6+CT7) / CT1 < 1.30. Furthermore, the following condition can also be met: 0.60 < (CT2+CT3+CT4+CT5+CT6+CT7) / CT1 < 1.20. If the Abbe number of the first optical element is V1 and the Abbe number of the second optical element is V2, the following condition can be satisfied: 0.20 < V2 / V1 < 1.60. Therefore, this is advantageous for correcting chromatic aberration over a wide range of object distances, effectively compensating for the focusing of light of different wavelengths. Furthermore, the following condition can also be satisfied: 0.30 < V2 / V1 < 1.50. If the radius of curvature of the object-side surface of the second optical element is R3 and the radius of curvature of the object-side surface of the fifth optical element is R9, the following condition can be satisfied: 0.05 < |R9 / R3| < 2.00. Therefore, it is advantageous to adjust the angle of refraction of light between the second and fifth optical elements to reduce stray light, allowing the optical imaging lens system to achieve high image resolution over various object distances. Furthermore, the following conditions can also be satisfied: 0.07 < |R9 / R3| < 1.50. Additionally, the following condition can also be satisfied: 0.10 < |R9 / R3| < 1.00. If a displacement parallel to the optical axis from an axial vertex of the image-side surface of the third optical element to a position of the maximum effective radius of the image-side surface of the third optical element is SAG3R2, and a displacement parallel to the optical axis from an axial vertex of the object-side surface of the sixth optical element to a position of the maximum effective radius of the object-side surface of the sixth optical element is SAG6R1, the following condition can be satisfied: -2.00 < SAG6R1 / SAG3R2 < 0.60. Therefore, it is advantageous to compensate for the beam path direction at the edge in order to improve the focusing quality of the light from all fields of view. Furthermore, the following condition can also be satisfied: -1.70 < SAG6R1 / SAG3R2 < 0.50. See Fig. 33, which shows a schematic view of SAG3R2 and SAG6R1 according to the first embodiment of the present disclosure. If the maximum effective radius of the object-side surface of the first optical element is Y1R1 and the maximum image height of the imaging lens system is ImgH, the following condition can be satisfied: 0.45 < Y1R1 / ImgH < 1.60. Therefore, it is advantageous to support the formation of a long focal length structure while maintaining a reasonable balance between the illuminance and the size of the image surface. Furthermore, the following condition can also be satisfied: 0.55 < Y1R1 / ImgH < 1.50. See Fig. 33, which shows a schematic view of Y1R1 according to the first embodiment of the present disclosure. If the radius of curvature of the object-side surface of the second optical element is R3 and the radius of curvature of the object-side surface of the third optical element is R5, the following condition can be met: -0.55 < R5 / R3 < 0.95. Therefore, it is advantageous to have the second and third optical elements work together in the center to correct spherical aberration, enabling the optical imaging lens system to capture clear images over various object distances. Furthermore, the following condition can also be met: -0.40 < R5 / R3 < 0.90. If the axial distance between the object-side surface of the first optical element and the image surface is TL, and the maximum image height of the optical imaging lens system is ImgH, the following condition can be satisfied: 4.30 < TL / ImgH < 5.10. Therefore, it is advantageous to form a telephoto structure and achieve a suitable balance between the total path length and the image height. Furthermore, the following condition can also be satisfied: 4.50 < TL / ImgH < 5.00. Additionally, the following condition can also be satisfied: 4.73 ≤ TL / ImgH ≤ 4.98. If the radius of curvature of the image-side surface of the seventh optical element is R14 and the focal length of the optical imaging lens system is f, the following condition can be satisfied: 0.08 < R14 / f < 0.48. Therefore, it is advantageous to control the lens curvature of the image-side surface of the seventh optical element and thereby optimize image quality over different object distances. Furthermore, the following condition can also be satisfied: 0.13 < R14 / f < 0.43. If the central thickness of the second optical element is CT2 and a displacement parallel to the optical axis from an axial vertex of the object-side surface of the second optical element to a position of the maximum effective radius of the object-side surface of the second optical element is SAG2R1, the following condition can be satisfied: -3.50 < CT2 / SAG2R1 < 1.80. Therefore, it is advantageous for receiving light emitted from the first optical element and for contributing to improved manufacturability. Furthermore, the following condition can also be satisfied: -3.30 < CT2 / SAG2R1 < 1.70. See Fig. 33, which shows a schematic view of SAG2R1 according to the first embodiment of the present disclosure. If a vertical distance between a critical point on the object-side surface of the seventh optical element and an optical axis is Yc71, and a maximum effective radius of the object-side surface of the seventh optical element is Y7R1, the following condition can be satisfied: 0.30 < Yc71 / Y7R1 < 0.90. Therefore, it is advantageous to increase the shape variation of the object-side surface of the seventh optical element to effectively correct off-axis aberration. Furthermore, the following condition can also be satisfied: 0.35 < Yc71 / Y7R1 < 0.85. See Fig. 32, which shows a schematic view of Yc71 according to the first embodiment of the present disclosure. See Fig. 33, which shows a schematic view of Y7R1 according to the first embodiment of the present disclosure. According to the present disclosure, unless otherwise specified, the parameters in the conditional expressions correspond to the state in which the optical imaging lens system is focused at a large distance. According to the present disclosure, the aforementioned features and conditions can be used in numerous combinations to achieve corresponding effects. According to the present disclosure, the optical elements of the optical imaging lens system can be made of either glass or plastic. If the optical elements are made of glass, the refractive power distribution of the optical imaging lens system can be more flexible, and the influence of temperature changes in the external environment on the imaging can be reduced. The glass optical element can be manufactured either by grinding or by forming. If the optical elements are made of plastic, the manufacturing costs can be effectively reduced. Furthermore, the surfaces of each optical element can be spherical or aspherical. Spherical optical elements are easy to manufacture.The design of aspherical optical elements allows for more control variables to eliminate aberrations and reduce the required number of optical elements, thereby effectively shortening the overall path length of the optical imaging lens system. Furthermore, the aspherical surfaces can be manufactured by plastic injection molding or glass forming. According to the present disclosure, if a lens surface is aspherical, it means that the lens surface has an aspherical shape over its entire optically effective area or one or more parts thereof. According to the present disclosure, the material of one or more of the optical elements can optionally contain an additive that generates light absorption and interference effects and modifies the transmittance of the optical elements in a specific wavelength range to reduce unwanted scattered light or color deviations. For example, the additive can optionally filter out light in the wavelength range of 600 nm to 800 nm to reduce excessive red and / or near-infrared light; or it can optionally filter out light in the wavelength range of 350 nm to 450 nm to prevent excessive blue and / or near-ultraviolet light from interfering with the final image. The additive can be homogeneously mixed with a plastic material used to manufacture a composite optical element by injection molding.Furthermore, the additive can be applied to the lens surfaces to achieve the effects mentioned above. According to the present disclosure, each object-side surface and image-side surface has a paraxial region and an off-axis region. The paraxial region refers to the region of the surface in which light rays travel close to the optical axis, and the off-axis region refers to the region of the surface that is farther from the paraxial region. In particular, unless otherwise specified, if the optical element has a convex surface, this means that the surface in the paraxial region thereof is convex; if the optical element has a concave surface, this means that the surface in the paraxial region thereof is concave.Furthermore, if a region of refractive power, radius of curvature, or focal point of an optical element is not defined, this means that the region of refractive power, radius of curvature, or focal point of the optical element lies within its paraxial region. The focal length of a single optical element is calculated using the lens formula, assuming air as the medium on both the object-side and image-side of the optical element (reflecting element and lens element); the combined focal length of multiple optical elements (reflecting element and lens element) is calculated by assuming air as the medium on both the object-side and image-side of the optical arrangement (reflecting element and lens element). According to the present disclosure, an inflection point is a point on the surface of the optical element where the surface changes from concave to convex or vice versa. A critical point is a non-axial point on the lens surface, its tangent being perpendicular to the optical axis. According to the present disclosure, the image surface of the optical imaging lens system, based on the corresponding image sensor, can be flat or curved, in particular a curved surface that is concave and faces the object side of the optical imaging lens system. According to the present disclosure, an image correction unit, such as an image field flattener, can optionally be arranged between the optical element closest to the image side of the optical imaging lens system along the beam path and the image surface to correct aberrations such as image field curvature. The optical properties of the image correction unit, such as curvature, thickness, refractive index, position, and surface shape (convex or concave surface with spherical, aspherical, diffractive, or Fresnel types), can be adapted according to the design of the image acquisition unit. In general, a preferred image correction unit is, for example, a thin transparent element with a concave object-side surface and a planar image-side surface, wherein the thin transparent element is arranged close to the image surface. According to the present disclosure, the optical imaging lens system can comprise at least one aperture, such as an aperture diaphragm, a glare shield, or a field diaphragm. The glare shield or field diaphragm can be arranged between an imaged object and the first optical element, between adjacent optical elements, or between the last optical element and the image surface, and serves to eliminate stray light and thereby improve image quality. According to the present disclosure, the position of the aperture diaphragm can be adjusted based on the object distance, the configuration of the first optical element, or the trim of the lens element. The position of the aperture diaphragm is not limited in the embodiments. According to the present disclosure, an aperture diaphragm can be configured as a front diaphragm or as a central diaphragm. A front diaphragm, arranged between an imaged object and the first optical element, can provide a greater distance between the exit pupil of the optical imaging lens system and the image surface to create a telecentric effect, thereby improving the image acquisition efficiency of an image sensor (for example, CCD or CMOS). A central diaphragm arranged between the first optical element and the image surface is advantageous for increasing the viewing angle of the optical imaging lens system, thus providing a wider field of view for it. According to the present disclosure, the imaging lens system can include an aperture control unit. The aperture control unit can be a mechanical component or a light modulator that can control the size and shape of the aperture by means of electricity or electrical signals. The mechanical component can include a movable element, such as an aperture assembly or a light-shielding film. The light modulator can include a shielding element, such as a filter, an electrochromic material, or a liquid crystal layer. The aperture control unit controls the amount of incident light or the exposure time to improve the possibilities for adjusting image quality. Furthermore, the aperture control unit can be the aperture diaphragm of the present disclosure, which changes the f-number to achieve various image effects, such as depth of field or light intensity. According to the present disclosure, the optical imaging lens system can comprise one or more optical elements to limit the shape of the light passing through the optical imaging lens system. Each optical element can be, among other things, a filter, a polarizer, etc., and each optical element can be, among other things, a one-piece element, a composite component, a thin film, etc. The optical element can be arranged on the object side or the image side of the optical imaging lens system, or between any two adjacent optical elements, to transmit light in a specific shape and thereby meet application requirements. According to the present disclosure, the optical imaging lens system can comprise at least one optical element, or a support, which has at least one surface with an antireflective coating. The antireflective coating can effectively reduce scattered light caused by light reflection at the interface. The antireflective coating can be arranged in an optically ineffective region of an object-side surface or an image-side surface of said optical element, or of a connecting surface between the object-side surface and the image-side surface. The said 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 light path deflection element, a prism, a mirror, etc.The aforementioned support can be a base for holding a lens assembly, a microlens arranged on an image sensor, a substrate surrounding the image sensor, a glass plate to protect the image sensor, etc. According to the present disclosure, the optical imaging lens system can further comprise a light-blocking element. The light-blocking element can have a non-circular aperture, and the non-circular aperture can have different effective radii in various directions perpendicular to the optical axis. Therefore, it is advantageous to match the shape of non-circular optical elements or an aperture diaphragm in order to effectively save space and fully utilize the light passing through the non-circular optical elements or the aperture diaphragm, thereby reducing stray light. In addition, the light-blocking element can be provided with a wave-like or serrated structure on the circumference of an inner aperture section thereof. The optical imaging lens system provided by the present disclosure can also be used for 3D image acquisition applications (three-dimensional image acquisition applications), for example in products such as digital cameras, mobile devices, digital tablets, smart TVs, network surveillance devices, motion-sensitive input devices, dashcams, reversing cameras for vehicles, multi-camera devices, image recognition systems, robots, laptops, 3D video cameras, action cameras, portable devices, drones and other electronic imaging devices. According to the present disclosure, the axial distance between two adjacent optical elements is a distance in a paraxial region between two adjacent surfaces of the two adjacent optical elements. According to the present disclosure, the maximum image height (ImgH) can be half the diagonal length of an effective light-sensitive area of ​​an image sensor. In accordance with the foregoing description of the present disclosure, the following specific embodiments are further specified. 1. Design Fig. 1 shows a schematic view of an image acquisition unit in the first state (focusing at a long distance) and in the second state (focusing at a short distance) according to the first embodiment of the present disclosure. Fig. 2 shows, from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit in the first state according to the first embodiment. Fig. 3 shows, from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit in the second state according to the first embodiment. The upper part of Fig. 1 shows the optical imaging lens system in the first state, and the lower part of Fig. 1 shows the optical imaging lens system in the second state.1 The image acquisition unit 1 comprises the optical imaging lens system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical imaging lens system comprises, in order from an object side to an image side along a beam path, an aperture S1, a first optical element E1, a second optical element E2, a third optical element E3, a fourth optical element E4, an aperture S2, a fifth optical element E5, an aperture S3, a sixth optical element E6, a seventh optical element E7, a filter E8 and an image surface IMG.The optical imaging lens system comprises seven optical elements (E1, E2, E3, E4, E5, E6 and E7), with no additional optical element being arranged between any of the adjacent seven optical elements, wherein the first optical element E1 is a reflecting element and each from the second optical element E2 to the seventh optical element E7 is a lens element. When an imaged object moves from a large distance to a short distance, the optical imaging lens system performs a focusing operation and switches from the first state to the second state. In this embodiment, the large object distance corresponding to the optical imaging lens system in the first state is ∞ (infinity), and the short object distance corresponding to the optical imaging lens system in the second state is 349.470 millimeters. During the focusing operation, the optical imaging lens system adjusts its focal length by shifting the fifth optical element E5, the sixth optical element E6, and the seventh optical element E7 along the optical axis relative to the second optical element E2, the third optical element E3, and the fourth optical element E4.Furthermore, the optical imaging lens system can be in the first state, as shown in the upper part of Fig. 1, and in the second state, as shown in the lower part of Fig. 1, due to the focusing process. The first optical element E1 with positive refractive power has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The first optical element E1 is made of glass and both the object-side and image-side surfaces are spherical. The second optical element E2, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The second optical element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the second optical element E2 has an inflection point. The image-side surface of the second optical element E2 has an inflection point. The object-side surface of the second optical element E2 has a critical point in an off-axis region. The image-side surface of the second optical element E2 has a critical point in an off-axis region. The third optical element E3, 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 third optical element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the third optical element E3 has an inflection point. The image-side surface of the third optical element E3 has an inflection point. The object-side surface of the third optical element E3 has a critical point in an off-axis region. The fourth optical 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 optical element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the fourth optical element E4 has an inflection point. The fifth optical element E5, 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 fifth optical element E5 is made of plastic material and has both aspherical object-side and image-side surfaces. The object-side surface of the fifth optical element E5 has two inflection points. The image-side surface of the fifth optical element E5 has one inflection point. The object-side surface of the fifth optical element E5 has a critical point in an off-axis region. The image-side surface of the fifth optical element E5 has a critical point in an off-axis region. The sixth optical element E6, 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 sixth optical element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth optical element E6 has an inflection point. The image-side surface of the sixth optical element E6 has an inflection point. The object-side surface of the sixth optical element E6 has a critical point in an off-axis region. The seventh optical element E7, 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 seventh optical element E7 is made of plastic material and has aspherical surfaces on both the object-side and image-side surfaces. The object-side surface of the seventh optical element E7 has an inflection point. The image-side surface of the seventh optical element E7 has an inflection point. The object-side surface of the seventh optical element E7 has a critical point in an off-axis region. The image-side surface of the seventh optical element E7 has a critical point in an off-axis region. The E8 filter is made of glass and is located between the seventh optical element E7 and the image surface IMG. It does not affect the focal length of the optical imaging lens system. The IS image sensor is located on or near the image surface IMG. The equation for the aspherical surface profiles of the aforementioned optical elements of the first embodiment is as follows: , where X is the displacement parallel to the optical axis from an axial vertex on the aspherical surface to a point at a distance Y from the optical axis on the aspherical surface; Y is the vertical distance from the point on the aspherical surface to the optical axis; R is the radius of curvature; k is the conic coefficient; and Ai is the i-th aspherical coefficient, where in the embodiments i may be, among others, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 and 26. In the optical imaging lens system of the image acquisition unit 1 according to the first embodiment, if the focal length of the long-distance focusing optical imaging lens system is fi, the f-number of the long-distance focusing optical imaging lens system is Fnoi, half of the maximum field of view of the long-distance focusing optical imaging lens system is HFOVi, and the maximum field of view of the long-distance focusing optical imaging lens system is FOVi, the following conditions are met: fi = 18.90 millimeters (mm); Fnoi = 1.68; HFOVi = 18.1 degrees and FOVi = 36.2 degrees. In the optical imaging lens system of the image acquisition unit 1 according to the first embodiment, if the focal length of the short-range focusing optical imaging lens system is fm, the f-number of the short-range focusing optical imaging lens system is Fnom, half of the maximum field of view of the short-range focusing optical imaging lens system is HFOVm, and the maximum field of view of the short-range focusing optical imaging lens system is FOVm, the following conditions are met: fm = 17.46 millimeters (mm); Fnom = 1.63; HFOVm = 18.4 degrees and FOVm = 36.8 degrees. The axial distance between an imaged object and aperture S1 is defined as D0. The axial distance between aperture S2 and the object-side surface of the fifth optical element E5 is defined as D1. The axial distance between the image-side surface of the seventh optical element E7 and the filter E8 is defined as D2. When the optical imaging lens system switches between the first state (focusing at a long distance) and the second state (focusing at a short distance) during the focusing process, the values ​​of D0, D1, and D2 change accordingly. When the optical imaging lens system is in the first state, the aforementioned parameters have the following values: D0 = ∞ (infinity), D1 = 2.180 mm, and D2 = 4.100 mm. When the optical imaging lens system is in the second state, the aforementioned parameters have the following values: D0 = 350.000 mm, D1 = 2.900 mm and D2 = 3.379 mm. If the axial distance between the object-side surface of the first optical element E1 and the image surface IMG is TL and the maximum image height of the optical imaging lens system is ImgH, then the following condition is met: TL / ImgH = 4.94. If the axial distance between the object-side surface of the first optical element E1 and the image-side surface of the seventh optical element E7 is TD and the maximum image height of the optical imaging lens system is ImgH, then the following condition is met: TD / ImgH = 4.13. If the focal length of the optical imaging lens system is f and the focal length of the second optical element E2 is f2, then the following condition is met: f / f2 = 0.84. If the focal length of the optical imaging lens system is f and the focal length of the fourth optical element E4 is f4, then the following condition is met: f / f4 = 2.02. If the focal length of the optical imaging lens system is f and a composite focal length of the second optical element E2, the third optical element E3 and the fourth optical element E4 is f234, then the following condition is satisfied: f / f234 = 1.45. If there is an axial distance between the object-side surface of the first optical element E1 and the image surface IMG of the long-distance focusing optical imaging lens system TLi, and an axial distance between the object-side surface of the first optical element E1 and the image surface IMG of the short-distance focusing optical imaging lens system TLm, the following condition is satisfied: |TLi-TLm| / TLi = 4.8E-05. If the radius of curvature of the object-side surface of the second optical element is E2 R3 and the radius of curvature of the object-side surface of the third optical element is E3 R5, then the following condition is met: R5 / R3 = 0.58. If the radius of curvature of the object-side surface of the second optical element is E2 R3 and the radius of curvature of the object-side surface of the fifth optical element is E5 R9, then the following condition is satisfied: |R9 / R3| = 0.40. If the radius of curvature of the object-side surface of the fourth optical element E4 is R7 and the radius of curvature of the image-side surface of the fourth optical element E4 is R8, then the following condition is satisfied: (R7+R8) / (R7-R8) = 0.23. If the radius of curvature of the object-side surface of the seventh optical element E7 is R13 and the radius of curvature of the image-side surface of the seventh optical element E7 is R14, then the following condition is satisfied: |R13 / R14| = 1.46. If the radius of curvature of the image-side surface of the seventh optical element E7 is R14 and the focal length of the optical imaging lens system is f, then the following condition is met: R14 / f = 0.19. If the axial distance between the object-side surface of the first optical element E1 and the image surface IMG is TL and a central thickness of the first optical element E1 is CT1, then the following condition is met: (TL-CT1) / CT1 = 1.89. If the central thickness of the second optical element E2 is CT2 and the axial distance between the first optical element E1 and the second optical element E2 is T12, then the following condition is met: CT2 / T12 = 0.49. If the central thickness of the second optical element E2 is CT2 and the central thickness of the third optical element E3 is CT3, then the following condition is met: CT2 / CT3 = 0.74. If the axial distance between the third optical element E3 and the fourth optical element E4 is T34 and the central thickness of the fourth optical element E4 is CT4, then the following condition is met: T34 / CT4 = 0.36. If the central thickness of the first optical element E1 is CT1, the central thickness of the second optical element E2 is CT2, the central thickness of the third optical element E3 is CT3, the central thickness of the fourth optical element E4 is CT4, the central thickness of the fifth optical element E5 is CT5, the central thickness of the sixth optical element E6 is CT6, and the central thickness of the seventh optical element E7 is CT7, then the following condition is satisfied: If the Abbe number of the first optical element E1 is V1 and the Abbe number of the second optical element E2 is V2, then the following condition is satisfied: V2 / V1 = 1.04. If the Abbe number of the sixth optical element E6 is V6 and the Abbe number of the seventh optical element E7 is V7, then the following condition is satisfied: V6 / V7 = 0.57. If the central thickness of the second optical element E2 is CT2 and a displacement parallel to the optical axis from an axial vertex of the object-side surface of the second optical element E2 to a position of the maximum effective radius of the object-side surface of the second optical element E2 is SAG2R1, the following condition is satisfied: CT2 / SAG2R1 = 1.00. In this embodiment, the direction of SAG2R1 faces the image side, and thus the value of SAG2R1 is positive. If a displacement parallel to the optical axis from an axial vertex of the image-side surface of the third optical element E3 to a position of the maximum effective radius of the image-side surface of the third optical element E3 is SAG3R2, and a displacement parallel to the optical axis from an axial vertex of the object-side surface of the sixth optical element E6 to a position of the maximum effective radius of the object-side surface of the sixth optical element E6 is SAG6R1, the following condition is satisfied: SAG6R1 / SAG3R2 = -0.27. In this embodiment, the direction of SAG3R2 faces the image side, and thus the value of SAG3R2 is positive; the direction of SAG6R1 faces the object side, and thus the value of SAG6R1 is negative. If the maximum effective radius of the object-side surface of the first optical element E1 is Y1R1 and the maximum image height of the optical imaging lens system is ImgH, then the following condition is met: Y1R1 / ImgH = 0.90. If a vertical distance between the critical point on the object-side surface of the seventh optical element E7 and the optical axis Yc71 is given, and a maximum effective radius of the object-side surface of the seventh optical element E7 is Y7R1, then the following condition is satisfied: Yc71 / Y7R1 = 0.47. The detailed optical data of the first embodiment are shown in Table 1A and Table 1B, and the data of the aspherical surface are listed in Table 1C below. Surface area # Radius of curvature Thickness Material index Abbe # Focal length 0ObjectPlanoD0 1BlendePlano-0.530 2Optical element 124,1908(SPH)10,724Glass1,58053,733.20 3-78.7402(SPH)1.308 4 Optical element 211.7371(ASP)0.638 Plastic 1.54456.022.58 5257.6459(ASP)0.039 6Optical element 36.8562(ASP)0.868Plastic1.58728.3-12.60 73.3925(ASP)1.229 8 Optical element 412.4367(ASP)3.425 Plastic 1.54456.09.34 9-7,7550(ASP)-1,346 10BlendePlanoD1 11Optical element 524.1908(ASP)0.674Plastic1.61426.0-17.75 12-78.7402(ASP)0.475 13BlendePlano0,639 14Optical element 6-28,2738(ASP)2,953Plastic1,65621,341.48 15-14,4400(ASP)0.773 16Optical element 75.1661(ASP)1.339Plastic1.56637.4-28.19 173.5371(ASP)D2 18FilterPlano0.210Glass1.51764.2- 19Plano0,774 20ImagePlano- Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 1) is 5.625 mm. An effective radius of aperture S2 (surface 10) is 4.497 mm. An effective radius of aperture S3 (surface 13) is 4,210 mm. Table 1A lists the radius of curvature, thickness, and focal length in millimeters (mm). Surface numbers 0-20 designate the surfaces that are arranged sequentially along the optical axis from the object side to the image side. Focusing on the long distance (First state) Focusing on the short distance (Second state) fi [mm]18.90fm [mm]17.46 Fnoi1,68Fnom1,63 HFOVi [degrees]18.1HFOVm [degrees]18.4 FOVi [degrees]36.2FOVm [degrees]36.8 Object distance [mm]∞ Object distance [mm]349,470 D0 [mm]∞D0 [mm]350,000 D1 [mm] 2.180 D1 [mm] 2.900 D2 [mm] 4.100 D2 [mm] 3.379 Table 1B shows optical data of the first and second states of the optical imaging lens system under different focusing conditions. It is understood that in this embodiment only two focusing conditions (i.e., the first state and the second state) are disclosed; however, the present disclosure is not limited thereto. In addition to the first and second states, the optical imaging lens system of this embodiment may also have other focal lengths corresponding to the intermediate range between the first and second states under other focusing conditions for different object distances. Table 1B shows that when the object distance D0 varies from infinity to 350,000 millimeters, the imaging lens system changes from the first state to the second state, the axial distance between the aperture S2 and the object-side surface of the fifth lens element E5 increases from 2.180 millimeters in the first state to 2.900 millimeters in the second state, and the axial distance between the image-side surface of the seventh optical element E7 and the filter E8 decreases from 4.100 millimeters in the first state to 3.379 millimeters in the second state. Surface #4567 k =1.64324E+009.00000E+019.15537E-01-2.02636E+00 A4 =-1.5796278E-036,4660528E-032,1368598E-03-7,6777998E-04 A6 =7.0050097E-04-8,6549082E-04-1,4226116E-03-1,8732275E-04 A8 =-1.3425118E-041,1464637E-042,2523713E-041,3851120E-05 A10 =1.5044940E-05-1.6803313E-05-2.8420671E-054.2520631E-07 A12 =-1.0256891E-062,1309385E-062.8052797E-06-1.5317015E-07 A14 =4.0012575E-08-1.8085513E-07-1.9631008E-071.1545612E-08 A16 =-8.2227361E-108.9722247E-098.7026025E-09-3.7536536E-10 A18 =6.9139971E-12-2,3432047E-10-2,1405172E-104,5083335E-12 A20 =-2.4898452E-122.1972184E-12- Surface #891112 k =4.41224E+000.00000E+000.00000E+00-1.31045E+01 A4 =5.2815070E-042,3852972E-049,1470391E-036,2754083E-01 A6 =-1.2466894E-04-2.5138034E-055.3161832E-049.4942780E+00 A8 =9.4712741E-068.1609024E-07-2.8700009E-04-4.6452182E+01 A10 =-2,6034470E-073,2135358E-075,5510505E-051,2978614E+02 A12 =-4.4353331E-08-5.4360924E-08-6.7813354E-06-2.4152973E+02 A14 =4,3002863E-093,8034931E-095,6242596E-073,0221579E+02 A16 =-1.3913112E-10-1.2872646E-10-3.1387021E-08-2.4112610E+02 A18 =1.5652881E-121.7811668E-121.1262809E-091.0966300E+02 A20 =---2.3472010E-11-2.1493264E+01 A22 =--2.1670523E-13- Surface #14151617 k =-9.90000E+01-3.96201E+00-7.90533E-02-9.62593E-01 A4 =-5.5131112E-03-1.1234979E-02-2.2714344E-02-1.7645615E+01 A6 =1.2893573E-033,1201958E-033,6258196E-036,9978713E+01 A8 =-2.3648667E-04-6.8925546E-04-5.8279139E-04-2.7399199E+02 A10 =3.0689455E-051,1877109E-047,7210428E-058,4292764E+02 A12 =-2.7840496E-06-1.5729086E-05-8.3926401E-06-1.9040905E+03 A14 =1.7327595E-071,5682496E-067,3904465E-073,0647888E+03 A16 =-6,9099196E-09-1,1534542E-07-5,1061006E-08-3,4223676E+03 A18 =1.5641808E-106,1188010E-092,6497108E-092,5446109E+03 A20 =-1.5082701E-12-2.2660526E-10-9.8162536E-11-1.1700337E+03 A22 =-5.5420581E-122.4254579E-122.8627627E+02 A24 =--8.0267903E-14-3.5568959E-14-2.4982575E+01 A26 =-5.2069849E-162.3306488E-16- In Table 1C, k represents the conic coefficient of the equation for the aspherical surface profiles. A4-A26 represent the aspherical coefficients from the 4th to the 26th order. The tables shown below for each embodiment are the corresponding schematic parameter and aberration curves; and the definitions of the tables are the same as Table 1A to Table 1C of the first embodiment. Therefore, no further explanation is given here. 2. Design Fig. 4 is a schematic view of an image acquisition unit in the first state (focusing at a long distance) and in the second state (focusing at a short distance) according to the second embodiment of the present disclosure. Fig. 5 shows, from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit in the first state according to the second embodiment. Fig. 6 shows, from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit in the second state according to the second embodiment. The upper part of Fig. 4 shows the optical imaging lens system in the first state, and the lower part of Fig. 4 shows the optical imaging lens system in the second state.4 The image acquisition unit 2 comprises the optical imaging lens system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical imaging lens system comprises, in order from an object side to an image side along a beam path, an aperture S1, a first optical lens element E1, a second optical lens element E2, a third optical lens element E3, an aperture S2, a fourth optical lens element E4, a fifth optical lens element E5, an aperture S3, a sixth optical lens element E6, a seventh optical lens element E7, a filter E8 and an image surface IMG.The optical imaging lens system comprises seven optical elements (E1, E2, E3, E4, E5, E6 and E7), with no additional optical element being arranged between any of the adjacent seven optical elements, wherein the first optical element E1 is a reflecting element and each from the second optical element E2 to the seventh optical element E7 is a lens element. When an imaged object moves from a large distance to a short distance, the optical imaging lens system performs a focusing operation and switches from the first state to the second state. In this embodiment, the large object distance corresponding to the optical imaging lens system in the first state is ∞ (infinity), and the short object distance corresponding to the optical imaging lens system in the second state is 199.906 millimeters. During the focusing operation, the optical imaging lens system adjusts its focal length by shifting the sixth optical element E6 and the seventh optical element E7 along the optical axis relative to the second optical element E2, the third optical element E3, the fourth optical element E4, and the fifth optical element E5.Furthermore, the optical imaging lens system can be in the first state, as shown in the upper part of Fig. 4, and in the second state, as shown in the lower part of Fig. 4, due to the focusing process. The first optical 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 optical element E1 is made of plastic material and both the object-side and image-side surfaces are spherical. The second optical element E2, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The second optical element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the second optical element E2 has an inflection point. The image-side surface of the second optical element E2 has an inflection point. The third optical element E3, 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 third optical element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the third optical element E3 has an inflection point. The image-side surface of the third optical element E3 has an inflection point. The fourth optical 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 optical element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the fourth optical element E4 has an inflection point. The fifth optical element E5, 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 fifth optical element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth optical element E5 has two inflection points. The image-side surface of the fifth optical element E5 has two inflection points. The object-side surface of the fifth optical element E5 has a critical point in an off-axis region. The image-side surface of the fifth optical element E5 has a critical point in an off-axis region. The sixth optical element E6, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is also concave in a paraxial region. The sixth optical element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth optical element E6 has one inflection point. The image-side surface of the sixth optical element E6 has two inflection points. The object-side surface of the sixth optical element E6 has one critical point in an off-axis region. The image-side surface of the sixth optical element E6 has two critical points in an off-axis region. The seventh optical element E7, 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 seventh optical element E7 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the seventh optical element E7 has an inflection point. The image-side surface of the seventh optical element E7 has an inflection point. The object-side surface of the seventh optical element E7 has a critical point in an off-axis region. The image-side surface of the seventh optical element E7 has a critical point in an off-axis region. The E8 filter is made of glass and is located between the seventh optical element E7 and the image surface IMG. It does not affect the focal length of the optical imaging lens system. The IS image sensor is located on or near the image surface IMG. In this embodiment, an axial distance between the aperture S3 and the object-side surface of the sixth optical element E6 is defined as D1. The detailed optical data of the 2nd embodiment are shown in Table 2A and Table 2B, and the data of the aspherical surfaces are listed in Table 2C below. Surface area # Radius of curvature Thickness Material index Abbe # Focal length 0ObjectPlanoD0 1BlendePlano-0,094 2Optical element 160.0648(SPH)9.812Plastic1.54456.0121.10 3641.0256(SPH)0.862 4Optical element 28.0073(ASP)0.787Plastic1.51156.816.61 5137.2777(ASP)0.071 6Optical element 36.6583(ASP)0.689Plastic1.58728.3-12.67 73,3786(ASP)1,586 8BlendePlano-0,514 9Optical element 412.6925(ASP)3.689Plastic1.51556.49.66 10-7,3801(ASP)0.834 11Optical element 5-4.6302(ASP)0.412Plastic1.53055.8804.19 12-4.7217(ASP)-0.485 13BlendePlanoD1 14Optical element 6-22.5467(ASP)0.724Plastic1.58728.3-24.91 1542,1227(ASP)2,353 16Optical element 75.5119(ASP)1.917Plastic1.51556.4-45.68 173.9379(ASP)D2 18FilterPlano0.210Glass1.51764.2- 19Plano1,556 20ImagePlano- Note: Reference wavelength is 587.6 nm (d-line). The effective radius of aperture S1 (surface 1) is 4.011 mm. An effective radius of aperture S2 (surface 8) is 4.050 mm. An effective radius of aperture S3 (surface 13) is 4.406 mm. Focusing on the long distance (First state) Focusing on the short distance (Second state) fi [mm]16.69fm [mm]14.39 Fnoi2.08Fnom1.92 HFOVi [degrees]19.9HFOVm [degrees]21.1 FOVi [degrees]39.8FOVm [degrees]42.2 Object distance [mm]∞ Object distance [mm]199.906 D0 [mm]∞D0 [mm]200,000 D1 [mm] 1.343 D1 [mm] 2.952 D2 [mm] 3.500 D2 [mm] 1.891 With the exception of D1, the optical data in Table 2B are the same as those of the first embodiment. In addition to the first and second states, the optical imaging lens system of this embodiment can also have other focal lengths under different focusing conditions for different object distances, corresponding to the intermediate range between the first and second states. Surface #4567 k =-5.96844E-02-5.44275E+001.04027E+00-2.13322E+00 A4 =-1.5685568E-039,1915894E-034,6306892E-031,0676232E-03 A6 =6.9522797E-04-1.9576877E-03-2.6110026E-03-7.0856631E-04 A8 = -1.5067732E-043,4035695E-044,5612824E-046,3423999E-05 A10 =2.3673851E-05-3.8304084E-05-5.5509460E-052.5695034E-08 A12 =-2.5218502E-062.8962967E-065.1870674E-06-4.5389688E-07 A14 =1.5989570E-07-1.8132195E-07-3.7782123E-073.8565560E-08 A16 =-5.4183514E-099.6963426E-091.9259371E-08-1.3870029E-09 A18 =7.4744533E-11-3.3650783E-10-5.7446270E-101.8858457E-11 A20 =-4.9910844E-127.2947915E-12- Surface #9101112 k =5.43537E+000.00000E+000.00000E+00-1.90077E+00 A4 =9,3029445E-041,8010076E-031,2966279E-023,4492317E+00 A6 =-1.6427568E-04-3.9134429E-04-3.9360984E-03-2.5953373E+01 A8 =3.2793574E-051,4549594E-041,4291537E-031,7912721E+02 A10 =-6.9153040E-06-2.5070527E-05-3.1274771E-04-7.5133927E+02 A12 =7.0257179E-072,1923442E-064,5629135E-052,1137724E+03 A14 =-3.5642158E-08-1.0421774E-07-4.6777761E-06-4.1610844E+03 A16 =9.0050067E-102.5970783E-093.3802140E-075.7031422E+03 A18 =-9.2156265E-12-2.6716543E-11-1.6731966E-08-5.2601478E+03 A20 =--5.3672206E-103.0723624E+03 A22 =---1.0022569E-11-1.0140059E+03 A24 =--8.2704180E-141.4197682E+02 Surface #14151617 k = -7.83741E+018.49365E+019.81527E-02-8.31222E-01 A4 =-7.9528202E-03-1,1508476E-02-1,1893510E-02-8,6151630E+00 A6 =2.6309200E-033,4392970E-037,3226325E-041,8667833E+01 A8 =-5.4379552E-04-7.4504207E-04-5.4161695E-05-4.0907107E+01 A10 =8,1676166E-051,2274080E-044,8504263E-065,7577608E+01 A12 =-8.5910056E-06-1.4888147E-05-1.7424150E-069.3161735E+00 A14 =5.7102578E-071,2779078E-065,3252986E-07-2.6872925E+02 A16 =-1.5736633E-08-7,3647489E-08-9,6463080E-086,6843327E+02 A18 =-9.0117450E-102.5412785E-091.1054810E-08-8.9068703E+02 A20 =1.1357187E-10-3,1978964E-11-8,3256152E-106.9942905E+02 A22 =-5.2219243E-12-1.0500832E-124.1263569E-11-3.0465036E+02 A24 =1.1955858E-134.6706375E-14-1.2985424E-125.6915946E+01 A26 =-1,1262042E-15-5,4152331E-162,3548803E-14- A28 =---1.8748204E-16- In the second embodiment, the equation for the aspherical surface profiles of the aforementioned optical elements is the same as the equation for the first embodiment. The definitions of these parameters listed in Table 2D are also the same as those given for the first embodiment, with corresponding values ​​for the second embodiment; therefore, no further explanation is given here. TL / ImgH4.73(TL-CT1) / CT11.99 TD / ImgH3,88CT2 / T120,91 f / f21,00CT2 / CT31,14 f / f41,73T34 / CT40,29 f / f2341,42(CT2+CT3+CT4+CT5+CT6+CT7) / CT10,84 |TLi-TLm| / TLi0.00V2 / V11.01 R5 / R30,83V6 / V70,50 |R9 / R3|0.58CT2 / SAG2R10.84 (R7+R8) / (R7-R8)0.26SAG6R1 / SAG3R2-0.19 |R13 / R14|1.40Y1R1 / ImgH0.65 R14 / f0,24Yc71 / Y7R10,60 3. Ausführungsform Fig. 7 is a schematic view of an image acquisition unit in the first state (focusing at a long distance) and in the second state (focusing at a short distance) according to the third embodiment of the present disclosure. Fig. 8 shows, from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit in the first state according to the third embodiment. Fig. 9 shows, from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit in the second state according to the third embodiment. The upper part of Fig. 7 shows the optical imaging lens system in the first state, and the lower part of Fig. 7 shows the optical imaging lens system in the second state.7 The image acquisition unit 3 comprises the optical imaging lens system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical imaging lens system comprises, in order from an object side to an image side along a beam path, an aperture S1, a first optical element E1, a second optical element E2, a third optical element E3, an aperture S2, a fourth optical element E4, a fifth optical element E5, an aperture S3, a sixth optical element E6, a seventh optical element E7, a filter E8 and an image surface IMG.The optical imaging lens system comprises seven optical elements (E1, E2, E3, E4, E5, E6 and E7), with no additional optical element being arranged between any of the adjacent seven optical elements, wherein the first optical element E1 is a reflecting element and each from the second optical element E2 to the seventh optical element E7 is a lens element. When an imaged object moves from a large distance to a short distance, the optical imaging lens system performs a focusing operation and switches from the first state to the second state. In this embodiment, the large object distance corresponding to the optical imaging lens system in the first state is ∞ (infinity), and the short object distance corresponding to the optical imaging lens system in the second state is 499.388 millimeters. During the focusing operation, the optical imaging lens system adjusts its focal length by displacing the fifth optical element E5, the sixth optical element E6, and the seventh optical element E7 along the optical axis relative to the second optical element E2, the third optical element E3, and the fourth optical element E4. Furthermore, the optical imaging lens system can, through the focusing operation, move from the first state, as shown in the upper part of Fig.7 shown, and are in the second state, as shown in the lower part of Fig. 7. The first optical 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 optical element E1 is made of glass and has both the object-side and image-side surfaces spherical. The second optical 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 optical element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the second optical element E2 has two inflection points. The image-side surface of the second optical element E2 has two inflection points. The image-side surface of the second optical element E2 has a critical point in an off-axis region. The third optical element E3, 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 third optical element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the third optical element E3 has an inflection point. The image-side surface of the third optical element E3 has an inflection point. The fourth optical 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 optical element E4 is made of glass and both its object-side and image-side surfaces are aspherical. The fifth optical element E5, 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 fifth optical element E5 is made of plastic material and has both aspherical object-side and image-side surfaces. The object-side surface of the fifth optical element E5 has an inflection point. The image-side surface of the fifth optical element E5 has an inflection point. The object-side surface of the fifth optical element E5 has a critical point in an off-axis region. The image-side surface of the fifth optical element E5 has a critical point in an off-axis region. The sixth optical element E6, 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 sixth optical element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth optical element E6 has two inflection points. The image-side surface of the sixth optical element E6 has one inflection point. The object-side surface of the sixth optical element E6 has two critical points in an off-axis region. The seventh optical element E7, 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 seventh optical element E7 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the seventh optical element E7 has two inflection points. The image-side surface of the seventh optical element E7 has one inflection point. The object-side surface of the seventh optical element E7 has a critical point in an off-axis region. The image-side surface of the seventh optical element E7 has a critical point in an off-axis region. The E8 filter is made of glass and is located between the seventh optical element E7 and the image surface IMG. It does not affect the focal length of the optical imaging lens system. The IS image sensor is located on or near the image surface IMG. In this embodiment, an axial distance between the image-side surface of the fourth optical element E4 and the object-side surface of the fifth optical element E5 is defined as D1. The detailed optical data of the 3rd embodiment are shown in Table 3A and Table 3B, and the data of the aspherical surfaces are listed in Table 3C below. Surface area # Radius of curvature Thickness Material index Abbe # Focal length 0ObjectPlanoD0 1BlendePlano-0,612 2Optical element 111.9197(SPH)10.997Glass1.52660,222.91 3689.6552(SPH)1.230 4Optical element 2-27.6156(ASP)0.451Plastic1.58230.2-321.82 5-32.5818(ASP)0.198 6Optical element 35.7969(ASP)0.592Plastic1.66120.3-16.41 73.6233(ASP)1.575 8BlendePlano-0,349 9Optical element 411.0476(ASP)3.562Glass1.53455.59.73 10-8,6964(ASP)D1 11Optical element 5-4.7770(ASP)1.242Plastic1.51156.8-29.82 12-7.5705(ASP)0.022 13BlendePlano0,285 14Optical element 658,3361(ASP)1,703Plastic1,70514,041.80 15-58.7859(ASP)0.721 16Optical element 77.5526(ASP)1.003Plastic1.56637.4-18.01 174,1298(ASP)D2 18FilterPlano0.210Glass1.51764.2- 19Plano1,149 20ImagePlano- Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 1) is 4.918 mm. An effective radius of aperture S2 (surface 8) is 4,100 mm. An effective radius of aperture S3 (surface 13) is 4,150 mm. Focusing on the long distance (First state) Focusing on the short distance (Second state) fi [mm]22.42fm [mm]20.36 Fnoi2,28Fnom2,19 HFOVi [degrees]15.0HFOVm [degrees]15.4 FOVi [degrees]30.0FOVm [degrees]30.8 Object distance [mm]∞ Object distance [mm]499,388 D0 [mm]∞D0 [mm]500,000 D1 [mm] 1.330 D1 [mm] 2.343 D2 [mm] 3.800 D2 [mm] 2.787 With the exception of D1, the optical data in Table 3B are the same as those of the first embodiment. In addition to the first and second states, the optical imaging lens system of this embodiment can also have other focal lengths for different object distances under different focusing conditions, corresponding to the intermediate range between the first and second states. Surface #4567 k =-5.06137E+01-7.63558E+017.43507E-01-2.09128E+00 A4 =-1.0464788E-044.9278443E-03-1.4715209E-03-1.4674690E-03 A6 =4.8857821E-04-3,0044132E-04-4,9040355E-041,4305045E-04 A8 =-1.2972151E-04-2,1981827E-053,4773842E-05-7,2762689E-05 A10 =2.2193036E-051,2625979E-052,4304060E-061,5177035E-05 A12 =-2.4618988E-06-1.6850283E-06-5.7429251E-07-1.6638643E-06 A14 =1.6195366E-078,4696291E-083,2856674E-081,0037046E-07 A16 =-5,7083424E-092,4332303E-10-6,1469918E-10-3,1675533E-09 A18 =8.2829236E-11-1.6381058E-10-6.0647130E-134.0914505E-11 A20 =-4.0370475E-12-1.0729887E-13- Surface #9101112 k =4.24151E+000.00000E+000.00000E+00-2.56874E+00 A4 =2,6127596E-041,2643019E-048,8440958E-03-2,5042728E-03 A6 = -7.8025584E-05-3.3668530E-05-1.8279433E-042.7617971E-03 A8 =8.5651007E-065.8853579E-06-5.0772314E-05-6.0513657E-04 A10 =-1.5451866E-06-6,2662957E-071,4130494E-058,1469313E-05 A12 =1.6554308E-074,0797584E-08-2,0216014E-06-7,4046768E-06 A14 =-1.0422165E-08-1.5719722E-091.8982331 E-074.6796412E-07 A16 =3.5075464E-103,1943498E-11-1,1914511E-08-2,0358202E-08 A18 = -4.9100498E-12-2.3173583E-134.8128489E-105.7432989E-10 A20 =---1,1279534E-11-9,1499088E-12 A22 =--1.1659453E-135.8601297E-14 Surface #14151617 k =5,63232E+018,43427E+016,30970E-01-8,97658E-01 A4 = -8,5403457E-03-6,2795283E-03-1,8092142E-02-1,6786763E-02 A6 = 1.7130444E-032.8969662E-041.2989087E-031.7248093E-03 A8 = -1,3306921E-042,3279171E-048,0191450E-05-7,8245585E-05 A10 =-1.9892970E-05-6.7690887E-05-1.2112165E-05-1.2756591E-05 A12 =6,4239634E-068,8690522E-06-6,8838420E-062,9131421E-06 A14 =-7,9477386E-07-6,0416335E-072,2040242E-06-2,8886173E-07 A16 =5.7667830E-081.3073763E-08-3.1991806E-071.7343329E-08 A18 =-2.6238672E-091.2442415E-092.8582805E-08-6.6624543E-10 A20 = 7.3021217E-11-1.2374650E-10-1.6991179E-091.6063687E-11 A22 = -1,1117176E-125,0838518E-126,8083139E-11-2,2208824E-13 A24 = 6.7444452E-15-1.0726720E-13-1.7817619E-121.3459319E-15 A26 =-9.5903145E-162.7667526E-14- A28 =---1,9392412E-16- In the third embodiment, the equation for the aspherical surface profiles of the aforementioned optical elements is the same as the equation for the first embodiment. The definitions of these parameters listed in Table 3D are also the same as those given for the first embodiment, with corresponding values ​​for the third embodiment; therefore, no further explanation is given here. TL / ImgH4.87(TL-CT1) / CT11.70 TD / ImgH4,03CT2 / T120,37 f / f2-0.07CT2 / CT30.76 f / f42.30T34 / CT40.34 f / f2341.17(CT2+CT3+CT4+CT5+CT6+CT7) / CT10.78 |TLi-TLm| / TLi0.00V2 / V10.50 R5 / R3-0.21V6 / V70.37 |R9 / R3|0.17CT2 / SAG2R1-3.07 (R7+R8) / (R7-R8)0.12SAG6R1 / SAG3R2-0.12 |R13 / R14|1.83Y1R1 / ImgH0.81 R14 / f0.18Yc71 / Y7R10.39 4. Design Fig. 10 is a schematic view of an image acquisition unit in the first state (focusing at a long distance) and in the second state (focusing at a short distance) according to the 4th embodiment of the present disclosure. Fig. 11 shows, from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit in the first state according to the 4th embodiment. Fig. 12 shows, from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit in the second state according to the 4th embodiment. The upper part of Fig. 10 shows the optical imaging lens system in the first state, and the lower part of Fig. 10 shows the optical imaging lens system in the second state.10 The image acquisition unit 4 comprises the optical imaging lens system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical imaging lens system comprises, in order from an object side to an image side along a beam path, an aperture S1, a first optical element E1, a second optical element E2, a third optical element E3, an aperture S2, a fourth optical element E4, a fifth optical element E5, a sixth optical element E6, a seventh optical element E7, a filter E8 and an image surface IMG.The optical imaging lens system comprises seven optical elements (E1, E2, E3, E4, E5, E6 and E7), with no additional optical element being arranged between any of the adjacent seven optical elements, wherein the first optical element E1 is a reflecting element and each from the second optical element E2 to the seventh optical element E7 is a lens element. When an imaged object moves from a large distance to a short distance, the optical imaging lens system performs a focusing operation and switches from the first state to the second state. In this embodiment, the large object distance corresponding to the optical imaging lens system in the first state is ∞ (infinity), and the short object distance corresponding to the optical imaging lens system in the second state is 149.595 millimeters. During the focusing operation, the optical imaging lens system adjusts its focal length by displacing the fifth optical element E5, the sixth optical element E6, and the seventh optical element E7 along the optical axis relative to the second optical element E2, the third optical element E3, and the fourth optical element E4. Furthermore, the optical imaging lens system can, through the focusing operation, move from the first state, as shown in the upper part of Fig.10 shown, and are in the second state, as shown in the lower part of Fig. 10. The first optical 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 optical element E1 is made of glass and both the object-side and image-side surfaces are spherical. The second optical element E2, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The second optical element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the second optical element E2 has an inflection point. The image-side surface of the second optical element E2 has an inflection point. The third optical element E3, 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 third optical element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the third optical element E3 has an inflection point. The image-side surface of the third optical element E3 has an inflection point. The fourth optical 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 optical element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the fourth optical element E4 has an inflection point. The fifth optical element E5, 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 fifth optical element E5 is made of plastic material and has both aspherical object-side and image-side surfaces. The object-side surface of the fifth optical element E5 has an inflection point. The image-side surface of the fifth optical element E5 has an inflection point. The object-side surface of the fifth optical element E5 has a critical point in an off-axis region. The image-side surface of the fifth optical element E5 has a critical point in an off-axis region. The sixth optical element E6, 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 sixth optical element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth optical element E6 has three inflection points. The image-side surface of the sixth optical element E6 has three inflection points. The image-side surface of the sixth optical element E6 has a critical point in an off-axis region. The seventh optical element E7, 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 seventh optical element E7 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the seventh optical element E7 has two inflection points. The image-side surface of the seventh optical element E7 has two inflection points. The object-side surface of the seventh optical element E7 has a critical point in an off-axis region. The image-side surface of the seventh optical element E7 has a critical point in an off-axis region. The E8 filter is made of glass and is located between the seventh optical element E7 and the image surface IMG. It does not affect the focal length of the optical imaging lens system. The IS image sensor is located on or near the image surface IMG. In this embodiment, an axial distance between the image-side surface of the fourth optical element E4 and the object-side surface of the fifth optical element E5 is defined as D1. The detailed optical data of the 4th embodiment are shown in Table 4A and Table 4B, and the data of the aspherical surfaces are listed in Table 4C below. Surface area # Radius of curvature Thickness Material index Abbe # Focal length 0ObjectPlanoD0 1BlendePlano-0,405 2Optical element 123.4039(SPH)10.612Glass1.51664.046.24 31057.9841(SPH)1.550 4Optical element 29.9928(ASP)0.772Plastic1.54556.120.38 597.0463(ASP)0.030 6Optical element 36.5175(ASP)0.859Plastic1.58728.3-13.23 73,3713(ASP)1,617 8BlendePlano-0,544 9Optical element 412.7412(ASP)2.980Plastic1.54556.18.93 10-7,2264(ASP)D1 11Optical element 5-4.5150(ASP)0.947Plastic1.58728.3-11.03 12-16,0659(ASP)1,282 13Optical element 69.8236(ASP)1.130Plastic1.66120.417.82 1456.5588(ASP)0.035 15Optical element 74.9317(ASP)0.933Plastic1.54556.1-25.65 163.4023(ASP)D2 17FilterPlano0.210Glass1.51764.2- 18Plano1,280 19ImagePlano- Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 1) is 4.519 mm. An effective radius of aperture S2 (surface 8) is 4.060 mm. Focusing on the long distance (First state) Focusing on the short distance (Second state) fi [mm]19.72fm [mm]16.67 Fnoi2,18Fnom2,04 HFOVi [degrees]17.3HFOVm [degrees]18.1 FOVi [degrees]34.6FOVm [degrees]36.2 Object distance [mm]∞ Object distance [mm]149,595 D0 [mm]∞D0 [mm]150,000 D1 [mm] 0.920 D1 [mm] 2.399 D2 [mm] 6.000 D2 [mm] 4.521 With the exception of D1, the optical data in Table 4B are the same as those of the first embodiment. In addition to the first and second states, the optical imaging lens system of this embodiment can also have other focal lengths for different object distances under different focusing conditions, corresponding to the intermediate range between the first and second states. Surface #4567 k =-2.70326E-01-9.43741E-011.05891E+00-2.01253E+00 A4 =-1,1281094E-037,7875165E-033,2855197E-034,7745618E-04 A6 =5.9411502E-04-1.2591622E-03-1.6807869E-03-3.0350838E-04 A8 =-1.1890109E-041.9322608E-042.3513470E-04-2.7388104E-05 A10 =1.5143146E-05-2.7105451E-05-2.7662819E-051.0954720E-05 A12 =-1.1985676E-063.5769437E-063.0874144E-06-1.2891970E-06 A14 =5.1353707E-08-3.5222237E-07-2.6961863E-077.9023754E-08 A16 =-1.0627321E-092.0864621E-081.4889269E-08-2.5024042E-09 A18 =7.4976688E-12-6.5254439E-10-4.4608843E-103.1931665E-11 A20 =-8.2909316E-125.4599214E-12- Surface #9101112 k =5.74156E+000.00000E+000.00000E+00-1.44674E+01 A4 =1.2186499E-031.2687671E-031.0631179E-02-2.8409425E-04 A6 =-2.4744994E-04-3.1902631E-047.0560472E-052.2859980E-03 A8 =3.0049321E-055.3489021E-05-2.2712660E-04-6.4793349E-04 A10 =-3.3054733E-06-5.3513753E-066.0894574E-051.1610252E-04 A12 =1.9043308E-072.9821550E-07-9.3584302E-06-1.3575499E-05 A14 =-3.6846742E-09-7,3526064E-099,2372937E-071,0158368E-06 A16 =-5.5238916E-11-1,2184416E-11-5,9131499E-08-4,5650888E-08 A18 =2.1079950E-123.0575004E-122.3805693E-091.0353520E-09 A20 =---5.4959766E-11-4.0848083E-12 A22 =--5.5821042E-13-1.7483125E-13 Surface #13141516 k = -6.74378E-01-6.07173E-02-6.65399E-02-1.00000E+00 A4 =-1,0111323E-029,8053344E-04-1,4745315E-03-1,1228521E-02 A6 =2.9303675E-03-2,0651277E-03-5,3824582E-03-4,2950256E-04 A8 =-7.3652857E-047,1755352E-041,7313377E-032,6267320E-04 A10 =1.1944674E-04-1.8501167E-04-3.7377555E-04-3.9993215E-05 A12 =-1,1832493E-053,5803552E-056,1272499E-053,4606882E-06 A14 =6.5030953E-07-4.8891530E-06-7.4972476E-06-1.8747030E-07 A16 =-1.0711448E-084,5763825E-076,5841403E-076,3541332E-09 A18 =-9.1810506E-10-2.9009987E-08-4.0226276E-08-1.2439016E-10 A20 =6.4568871E-111,2228588E-091,6555539E-091,0018653E-12 A22 =-1.6839063E-12-3,2824543E-11-4,3553556E-116,3236273E-15 A24 =1.6680345E-145.0772983E-136.5725710E-13-1.3241579E-16 A26 =--3.4445102E-15-4.2256560E-15- A28 =---2,2822797E-18- In the fourth embodiment, the equation for the aspherical surface profiles of the aforementioned optical elements is the same as the equation for the first embodiment. The definitions of these parameters listed in Table 4D are also the same as those given for the first embodiment, with corresponding values ​​for the fourth embodiment; therefore, no further explanation is given here. TL / ImgH4.90(TL-CT1) / CT11.88 TD / ImgH3,70CT2 / T120,50 f / f20.97CT2 / CT30.90 f / f42.21T34 / CT40.36 f / f2341.70(CT2+CT3+CT4+CT5+CT6+CT7) / CT10.72 |TLi-TLm| / TLi0.00V2 / V10.88 R5 / R30,65V6 / V70,36 |R9 / R3|0.45CT2 / SAG2R11.14 (R7+R8) / (R7-R8)0.28SAG6R1 / SAG3R20.20 |R13 / R14|1.45Y1R1 / ImgH0.72 R14 / f0,17Yc71 / Y7R10,58 5. Ausführungsform Fig. 13 is a schematic view of an image acquisition unit in the first state (focusing at a long distance) and in the second state (focusing at a short distance) according to the 5th embodiment of the present disclosure. Fig. 14 shows, from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit in the first state according to the 5th embodiment. Fig. 15 shows, from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit in the second state according to the 5th embodiment. The upper part of Fig. 13 shows the optical imaging lens system in the first state, and the lower part of Fig. 13 shows the optical imaging lens system in the second state.13 The image acquisition unit 5 comprises the optical imaging lens system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical imaging lens system comprises, in order from an object side to an image side along a beam path, an aperture S1, a first optical element E1, a second optical element E2, a third optical element E3, an aperture S2, a fourth optical element E4, a fifth optical element E5, a sixth optical element E6, a seventh optical element E7, a filter E8 and an image surface IMG.The optical imaging lens system comprises seven optical elements (E1, E2, E3, E4, E5, E6 and E7), with no additional optical element being arranged between any of the adjacent seven optical elements, wherein the first optical element E1 is a reflecting element and each from the second optical element E2 to the seventh optical element E7 is a lens element. When an imaged object moves from a large distance to a short distance, the optical imaging lens system performs a focusing operation and switches from the first state to the second state. In this embodiment, the large object distance corresponding to the optical imaging lens system in the first state is ∞ (infinity), and the short object distance corresponding to the optical imaging lens system in the second state is 379.843 millimeters. During the focusing operation, the optical imaging lens system adjusts its focal length by shifting the fifth optical element E5, the sixth optical element E6, and the seventh optical element E7 along the optical axis relative to the second optical element E2, the third optical element E3, and the fourth optical element E4. Furthermore, the optical imaging lens system can, through the focusing operation, shift from the first state, as shown in the upper part of Fig.13 shown, and are in the second state, as shown in the lower part of Fig. 13. The first optical 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 planar in a paraxial region. Both the object-side and image-side surfaces of the first optical element E1 are spherical. In this embodiment, the first optical element E1 is a reflective element assembly comprising a lens element LS1, a cemented adhesive layer CML, and a prism PR. The lens element LS1 has an object-side surface that is convex in a paraxial region and an image-side surface that is planar in a paraxial region. The lens element LS1 is made of plastic material. The prism PR has an object-side surface that is planar in a paraxial region and an image-side surface that is planar in a paraxial region.The prism PR is made of glass. The prism PR is cemented to the image side of the lens element LS1 via the cemented adhesive layer CML. The second optical element E2, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The second optical element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the second optical element E2 has an inflection point. The image-side surface of the second optical element E2 has an inflection point. The third optical element E3, 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 third optical element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the third optical element E3 has an inflection point. The image-side surface of the third optical element E3 has an inflection point. The fourth optical 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 optical element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the fourth optical element E4 has an inflection point. The fifth optical element E5, 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 fifth optical element E5 is made of plastic material and has both aspherical object-side and image-side surfaces. The object-side surface of the fifth optical element E5 has an inflection point. The image-side surface of the fifth optical element E5 has an inflection point. The object-side surface of the fifth optical element E5 has a critical point in an off-axis region. The image-side surface of the fifth optical element E5 has a critical point in an off-axis region. The sixth optical element E6, 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 sixth optical element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth optical element E6 has two inflection points. The image-side surface of the sixth optical element E6 has two inflection points. The object-side surface of the sixth optical element E6 has two critical points in an off-axis region. The image-side surface of the sixth optical element E6 has one critical point in an off-axis region. The seventh optical element E7, 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 seventh optical element E7 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the seventh optical element E7 has two inflection points. The image-side surface of the seventh optical element E7 has two inflection points. The object-side surface of the seventh optical element E7 has a critical point in an off-axis region. The image-side surface of the seventh optical element E7 has a critical point in an off-axis region. The E8 filter is made of glass and is located between the seventh optical element E7 and the image surface IMG. It does not affect the focal length of the optical imaging lens system. The IS image sensor is located on or near the image surface IMG. In this embodiment, an axial distance between the image-side surface of the fourth optical element E4 and the object-side surface of the fifth optical element E5 is defined as D1. The detailed optical data of the 5th embodiment are shown in Table 5A and Table 5B, and the data of the aspherical surfaces are listed in Table 5C below. Surface area # Radius of curvature Thickness Material index Abbe # Focal length 0ObjectPlanoD0 1BlendePlano-0,157 2 Optical element 131.0038(SPH)0.865 Plastic 1.55144.556.22 3Plano(SPH)0.030Cattered1.48553.2 4Plano(SPH)9,800Glas1,62639,1 5Plano(SPH)0.511 6Optical element 29.8926(ASP)0.600Plastic1.54456.019.67 7127.7636(ASP)0.030 8Optical element 36.5957(ASP)0.786Plastic1.58728.3-12.62 93.3357(ASP)1.543 10BlendePlano-0,601 11Optical element 412.4595(ASP)4.228Plastic1.51156.89.67 12-7,2472(ASP)D1 13Optical element 5-4.5758(ASP)0.602Plastic1.63923.5-14.10 14-9,7801(ASP)0.764 15Optical element 621.9405(ASP)1.717Plastic1.70514.039.85 1697.0494(ASP)0.527 17Optical element 74.8497(ASP)1.339Plastic1.56637.4-52.99 183.7581(ASP)D2 19FilterPlano0.210Glass1.51764.2- 20Plano0,475 21ImagePlano- Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 1) is 4.007 mm. An effective radius of aperture S2 (surface 10) is 3,950 mm. Focusing on the long distance (First state) Focusing on the short distance (Second state) fi [mm]18.91fm [mm]17.55 Fnoi2,36Fnom2,30 HFOVi [degrees]17.8HFOVm [degrees]18.2 FOVi [degrees]35.6FOVm [degrees]36.4 Object distance [mm]∞ Object distance [mm]379.843 D0 [mm]∞D0 [mm]380,000 D1 [mm] 1.862 D1 [mm] 2.572 D2 [mm] 5,600 D2 [mm] 4,890 With the exception of D1, the optical data in Table 5B are the same as those of the first embodiment. In addition to the first and second states, the optical imaging lens system of this embodiment can also have other focal lengths for different object distances under different focusing conditions, corresponding to the intermediate range between the first and second states. Surface #6789 k =5.79873E-04-9.90000E+011.05700E+00-2.04340E+00 A4 =-2.5191495E-036.3517313E-033.5678241E-031.3121942E-03 A6 =1.2066354E-03-6.4884351E-04-2.2135069E-03-1.1210542E-03 A8 =-2.6971622E-042.1913589E-053.7413382E-042.1235842E-04 A10 =3.9328120E-058.9534242E-06-4.0521552E-05-2.4563094E-05 A12 =-3.6704377E-06-1.4468427E-063.0131420E-061.7867059E-06 A14 =2.0288130E-077.0001028E-08-1.6900645E-07-7.9006137E-08 A16 =-6.0566023E-095.5273309E-107.2995274E-091.9538101E-09 A18 =7.5072970E-11-1.4003328E-10-2.0771049E-10-2.0910238E-11 A20 =-3.0614869E-122.6671275E-12- Surface #11121314 k =5.41566E+000.00000E+000.00000E+00-6.51707E+00 A4 =1.3546800E-032.1891371E-047.2927491E-03-2.9177225E-03 A6 =-3.0057451E-049.9514695E-072.2355517E-034.0642441E-03 A8 =3.4497242E-05-2.0582042E-06-8.2172803E-04-1.0578096E-03 A10 =-2.9993813E-063.8931947E-071.5768830E-041.6218715E-04 A12 =1.4448616E-07-3.8997607E-08-1.9880537E-05-1.6256126E-05 A14 =-3.0046811E-092.3894523E-091.7216012E-061.0551741E-06 A16 =1.4041468E-11-7.9734404E-11-1.0107178E-07-3.9938361E-08 A18 =-1.1633203E-123.8343471E-095.9360833E-10 A20 =---8.4669940E-119.3800868E-12 A22 =--8.2713032E-13-3.2973647E-13 Surface #15161718 k =7.03801E+00-9.90000E+01-7.81926E-02-8.59324E-01 A4 =-7.9237117E-03-6.0516347E-03-1.3678524E-02-1.0849677E-02 A6 =2.0344636E-039.7886403E-046.8561967E-042.7655993E-04 A8 =-3.7195081E-04-1.0854484E-04-1.3844574E-058.9925546E-05 A10 =4.1148182E-057.7121130E-061.3729781E-06-2.0143292E-05 A12 =-2.4654730E-06-6.8077791E-07-9.8335011E-072.2864346E-06 A14 =-1.1396076E-088.8853431E-081.5947203E-07-1.6776828E-07 A16 =1.5488122E-08-9.0799433E-09-1.2714684E-088.4045379E-09 A18 =-1.2299290E-096.1436813E-105.8475053E-10-2.8831365E-10 A20 =4.2691575E-11-2.6484527E-11-1.6033511E-116.5291300E-12 A22 =-5.7352717E-136.5643925E-132.5049823E-13-8.8398290E-14 A24 =--7.0336818E-15-1.7899301E-155.4359749E-16 In the 5th embodiment, the equation for the aspherical surface profiles of the aforementioned optical elements is the same as the equation for the 1st embodiment. The definitions of these parameters listed in Table 5D are also the same as those given for the 1st embodiment, with corresponding values ​​for the 5th embodiment; therefore, no further explanation is given here. TL / ImgH4.98(TL-CT1) / CT11.89 TD / ImgH3,97CT2 / T121,17 f / f20.96CT2 / CT30.76 f / f41.96T34 / CT40.22 f / f2341,48(CT2+CT3+CT4+CT5+CT6+CT7) / CT10,87 |TLi-TLm| / TLi0.00V2 / V11.26 R5 / R30,67V6 / V70,37 |R9 / R3|0.46CT2 / SAG2R10.82 (R7+R8) / (R7-R8)0.26SAG6R1 / SAG3R2-0.07 |R13 / R14|1.29Y1R1 / ImgH0.65 R14 / f0,20Yc71 / Y7R10,59 6. Ausführungsform Fig. 16 is a schematic view of an image acquisition unit in the first state (focusing at a long distance) and in the second state (focusing at a short distance) according to the 6th embodiment of the present disclosure. Fig. 17 shows, from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit in the first state according to the 6th embodiment. Fig. 18 shows, from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit in the second state according to the 6th embodiment. The upper part of Fig. 16 shows the optical imaging lens system in the first state, and the lower part of Fig. 16 shows the optical imaging lens system in the second state.16 The image acquisition unit 6 comprises the optical imaging lens system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The optical imaging lens system comprises, in order from an object side to an image side along a beam path, an aperture S1, a first optical element E1, a second optical element E2, a third optical element E3, a fourth optical element E4, an aperture S2, a fifth optical element E5, an aperture S3, a sixth optical element E6, a seventh optical element E7, a filter E8 and an image surface IMG.The optical imaging lens system comprises seven optical elements (E1, E2, E3, E4, E5, E6 and E7), with no additional optical element being arranged between any of the adjacent seven optical elements, wherein the first optical element E1 is a reflecting element and each from the second optical element E2 to the seventh optical element E7 is a lens element. When an imaged object moves from a large distance to a short distance, the optical imaging lens system performs a focusing operation and switches from the first state to the second state. In this embodiment, the large object distance corresponding to the optical imaging lens system in the first state is ∞ (infinity), and the short object distance corresponding to the optical imaging lens system in the second state is 99.480 millimeters. During the focusing operation, the optical imaging lens system adjusts its focal length by displacing the fifth optical element E5, the sixth optical element E6, and the seventh optical element E7 along the optical axis relative to the second optical element E2, the third optical element E3, and the fourth optical element E4. Furthermore, the optical imaging lens system can, through the focusing operation, move from the first state to the upper part of Fig.16 shown, and are in the second state, as shown in the lower part of Fig. 16. The first optical element E1 with positive refractive power has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The first optical element E1 is made of glass and both the object-side and image-side surfaces are spherical. The second optical element E2, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The second optical element E2 is made of glass and both its object-side and image-side surfaces are aspherical. The object-side surface of the second optical element E2 has an inflection point. The image-side surface of the second optical element E2 has an inflection point. The object-side surface of the second optical element E2 has a critical point in an off-axis region. The image-side surface of the second optical element E2 has a critical point in an off-axis region. The third optical element E3, 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 third optical element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the third optical element E3 has one inflection point. The image-side surface of the third optical element E3 has three inflection points. The fourth optical 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 optical element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the fourth optical element E4 has an inflection point. The fifth optical element E5, 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 fifth optical element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth optical element E5 has an inflection point. The image-side surface of the fifth optical element E5 has an inflection point. The image-side surface of the fifth optical element E5 has a critical point in an off-axis region. The sixth optical element E6, 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 sixth optical element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth optical element E6 has two inflection points. The image-side surface of the sixth optical element E6 has one inflection point. The object-side surface of the sixth optical element E6 has a critical point in an off-axis region. The seventh optical element E7, 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 seventh optical element E7 is made of plastic material and has aspherical surfaces on both the object-side and image-side surfaces. The object-side surface of the seventh optical element E7 has an inflection point. The image-side surface of the seventh optical element E7 has an inflection point. The object-side surface of the seventh optical element E7 has a critical point in an off-axis region. The image-side surface of the seventh optical element E7 has a critical point in an off-axis region. The E8 filter is made of glass and is located between the seventh optical element E7 and the image surface IMG. It does not affect the focal length of the optical imaging lens system. The IS image sensor is located on or near the image surface IMG. The detailed optical data of the 6th embodiment are shown in Table 6A and Table 6B, and the data of the aspherical surfaces are listed in Table 6C below. Surface area # Radius of curvature Thickness Material index Abbe # Focal length 0ObjectPlanoD0 1BlendePlano-0,520 2Optical element 121,2068(SPH)10,417Glass1,58961,329.46 3-78.1250(SPH)0.867 4Optical element 210,3352(ASP)1,014Glass1,54762,723.99 547.0068(ASP)0.030 6Optical element 36.7592(ASP)0.924Plastic1.61426.0-12.37 73.3893(ASP)0.815 8Optical element 412.1552(ASP)2.899Plastic1.51556.49.93 9-8,1258(ASP)-1,014 10BlendePlanoD1 11Optical element 5-4.5628(ASP)1.054Plastic1.56637.4-11.56 12-16,3194(ASP)0.652 13BlendePlano0,382 14Optical element 636,4107(ASP)2,860Plastic1,61426,018.78 15-16,3566(ASP)0.033 16Optical element 74.9740(ASP)0.745Plastic1.52945.4-38.36 173,7881(ASP)D2 18FilterPlano0.210Glass1.51764.2- 19Plano1,771 20ImagePlano- Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 1) is 5.306 mm. An effective radius of aperture S2 (surface 10) is 4.252 mm. An effective radius of aperture S3 (surface 13) is 4.060 mm. Focusing on the long distance (First state) Focusing on the short distance (Second state) fi [mm]21.23fm [mm]17.11 Fnoi2.00Fnom1.92 HFOVi [degrees]16.4HFOVm [degrees]16.6 FOVi [degrees]32.8FOVm [degrees]33.2 Object distance [mm]∞ Object distance [mm]99,480 D0 [mm]∞D0 [mm]100,000 D1 [mm] 1.494 D1 [mm] 4.230 D2 [mm] 6.000 D2 [mm] 3.264 In Table 6B, the optical data are the same as those of the first embodiment. In addition to the first and second states, the optical imaging lens system of this embodiment can also have other focal lengths under different focusing conditions for different object distances, corresponding to the intermediate range between the first and second states. Surface #4567 k =1.96621E+009.00000E+019.20532E-01-2.08002E+00 A4 =3.7869973E-047,0162311E-03-8,2113858E-04-2,1827566E-03 A6 =-3,6118228E-05-6,1683952E-041,2082455E-048,2148251E-04 A8 =2.9073864E-057.0319011E-05-1.0762902E-04-2.1584657E-04 A10 =-6.0188114E-06-9.8865062E-061.4967840E-052.7159177E-05 A12 =5.7322118E-071,0298859E-06-1,1754443E-06-2,0573153E-06 A14 =-3,1430135E-08-7,5725188E-086,3870044E-089,7560169E-08 A16 =9.1384193E-103.5045962E-09-2.4305800E-09-2.6222985E-09 A18 =-1.0777063E-11-8.8577852E-115.7220407E-112.9806047E-11 A20 =-9.2179380E-13-6.1933837E-13- Surface #891112 k =5.12156E+000.00000E+000.00000E+00-1.23619E+01 A4 =9.8643927E-04-3,4474653E-047,1795626E-03-2,6877063E-03 A6 =-3,0283743E-051,7285493E-041,6621776E-033,6781457E-03 A8 =1.1150235E-05-3.7429192E-05-6.1978303E-04-9.8614890E-04 A10 =-2.6980983E-065,3721282E-061,1990424E-041,7123288E-04 A12 =1.2079387E-07-4.6240217E-07-1.5266267E-05-2.0609414E-05 A14 =3.8008210E-092,3479398E-081,3336862E-061,7223834E-06 A16 =-3.5858877E-10-6,4955217E-10-7,9115181E-08-9,7264293E-08 A18 =6.1520809E-127.7965740E-123.0457355E-093.5072133E-09 A20 =---6.8590350E-11-7.2292444E-11 A22 =--6.8647598E-136.4417866E-13 Surface #14151617 k =-7.65326E+009.79235E+00-1.48235E-01-8.72159E-01 A4 =-1,0812648E-02-3,9800949E-036,7659573E-043,1216730E-03 A6 =2.8094795E-03-1.2192120E-04-4.0068893E-03-4.6732925E-03 A8 = -6.2430356E-047.9343558E-057.4637496E-049.6588235E-04 A10 =9.8622274E-05-4,8751753E-06-8,5619606E-05-1,1905502E-04 A12 =-1.0448195E-05-1.1269958E-069.2511485E-069.9176134E-06 A14 =7.0764767E-072,9680405E-07-1,1604073E-06-5,7878879E-07 A16 =-2.6455475E-08-3.5377067E-081.3204192E-072.3752838E-08 A18 =1.7792928E-102.6100151E-09-1.1043234E-08-6.7242585E-10 A20 =2.7862438E-11-1,2486004E-106,3764692E-101,2503180E-11 A22 =-1.1197590E-123.7702467E-12-2.4749424E-11-1.3728272E-13 A24 =1.4375279E-14-6,5294039E-146,1772825E-136,7295295E-16 A26 =-4.9442122E-16-8.9679672E-15- In the 6th embodiment, the equation for the aspherical surface profiles of the aforementioned optical elements is the same as the equation for the 1st embodiment. The definitions of these parameters listed in Table 6D are also the same as those given for the 1st embodiment, with corresponding values ​​for the 6th embodiment; therefore, no further explanation is given here. TL / ImgH4.98(TL-CT1) / CT11.99 TD / ImgH3,70CT2 / T121,17 f / f20.88CT2 / CT31.10 f / f42.14T34 / CT40.28 f / f2341.36(CT2+CT3+CT4+CT5+CT6+CT7) / CT10.91 |TLi-TLm| / TLi0.00V2 / V11.02 R5 / R30,65V6 / V70,57 |R9 / R3|0.44CT2 / SAG2R11.39 (R7+R8) / (R7-R8)0.20SAG6R1 / SAG3R2-0.19 |R13 / R14|1.31Y1R1 / ImgH0.85 R14 / f0.18Yc71 / Y7R10.55 7. Design Fig. 19 is a schematic view of an image acquisition unit in the first state (focusing at a long distance) and in the second state (focusing at a short distance) according to the 7th embodiment of the present disclosure. Fig. 20 shows, from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit in the first state according to the 7th embodiment. Fig. 21 shows, from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit in the second state according to the 7th embodiment. The upper part of Fig. 19 shows the optical imaging lens system in the first state, and the lower part of Fig. 19 shows the optical imaging lens system in the second state.19 The image acquisition unit 7 comprises the optical imaging lens system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The imaging lens system comprises, in order from an object side to an image side along a beam path, a first optical element E1, an aperture S1, a second optical element E2, a third optical element E3, a fourth optical element E4, a fifth optical element E5, an aperture S2, a sixth optical element E6, a seventh optical element E7, a filter E8 and an image surface IMG.The optical imaging lens system comprises seven optical elements (E1, E2, E3, E4, E5, E6 and E7), with no additional optical element being arranged between any of the adjacent seven optical elements, wherein the first optical element E1 is a reflecting element and each from the second optical element E2 to the seventh optical element E7 is a lens element. When an imaged object moves from a large distance to a short distance, the optical imaging lens system performs a focusing operation and switches from the first state to the second state. In this embodiment, the large object distance corresponding to the optical imaging lens system in the first state is ∞ (infinity), and the short object distance corresponding to the optical imaging lens system in the second state is 250,000 millimeters. During the focusing operation, the optical imaging lens system adjusts its focal length by displacing the fifth optical element E5, the sixth optical element E6, and the seventh optical element E7 along the optical axis relative to the second optical element E2, the third optical element E3, and the fourth optical element E4. Furthermore, the optical imaging lens system can, through the focusing operation, move from the first state to the upper part of Fig.19 shown, and are in the second state, as shown in the lower part of Fig. 19. The first optical 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 optical element E1 is made of glass and both the object-side and image-side surfaces are spherical. The second optical element E2, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The second optical element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the second optical element E2 has one inflection point. The image-side surface of the second optical element E2 has two inflection points. The image-side surface of the second optical element E2 has a critical point in an off-axis region. The third optical element E3, 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 third optical element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the third optical element E3 has an inflection point. The image-side surface of the third optical element E3 has an inflection point. The image-side surface of the third optical element E3 has a critical point in an off-axis region. The fourth optical 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 optical element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fourth optical element E4 has an inflection point. The fifth optical element E5, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The fifth optical element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth optical element E5 has an inflection point. The image-side surface of the fifth optical element E5 has an inflection point. The image-side surface of the fifth optical element E5 has a critical point in an off-axis region. The sixth optical element E6, 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 sixth optical element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth optical element E6 has two inflection points. The image-side surface of the sixth optical element E6 has one inflection point. The object-side surface of the sixth optical element E6 has a critical point in an off-axis region. The image-side surface of the sixth optical element E6 has a critical point in an off-axis region. The seventh optical element E7, 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 seventh optical element E7 is made of plastic material and has both aspherical object-side and image-side surfaces. The object-side surface of the seventh optical element E7 has an inflection point. The image-side surface of the seventh optical element E7 has an inflection point. The object-side surface of the seventh optical element E7 has a critical point in an off-axis region. The image-side surface of the seventh optical element E7 has a critical point in an off-axis region. The E8 filter is made of glass and is located between the seventh optical element E7 and the image surface IMG. It does not affect the focal length of the optical imaging lens system. The IS image sensor is located on or near the image surface IMG. In this embodiment, the axial distance between the imaged object and the object-side surface of the first optical element E1 is defined as D0. The axial distance between the image-side surface of the fourth optical element E4 and the object-side surface of the fifth optical element E5 is defined as D1. The detailed optical data of the 7th embodiment are shown in Table 7A and Table 7B, and the data of the aspherical surfaces are listed in Table 7C below. Surface area # Radius of curvature Thickness Material index Abbe # Focal length 0ObjectPlanoD0 1Optical element 114.8845(SPH)9.600Glass1.51664.063.49 221.3000(SPH)2.445 3BlendePlano-0,845 4 Optical element 215.7298(ASP)0.800 Plastic 1.54556.110.74 5-9.1546(ASP)0.030 6Optical element 35.6639(ASP)0.804Plastic1.54556.1-36.43 74.1859(ASP)0.173 8 Optical element 440.5169(ASP)0.656 Plastic 1.61425.6-12.25 96.3035(ASP)D1 10Optical element 57.9268(ASP)2.072Plastic1.54556.118.33 1134.8506(ASP)0.181 12BlendePlano0,657 13 Optical element 6-4.5974(ASP)1.876 Plastic 1.63923.5-145.20 14-5.6065(ASP)0.035 15Optical element 74.1729(ASP)1.225Plastic1.53456.0121.18 164.0044(ASP)D2 17FilterPlano0.210Glass1.51764.2- 18Plano0,135 19ImagePlano- Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 3) is 3.525 mm. An effective radius of aperture S2 (surface 12) is 3,660 mm. Focusing on the long distance (First state) Focusing on the short distance (Second state) fi [mm]19.87fm [mm]19.04 Fnoi2,10Fnom2,24 HFOVi [degrees]17.1HFOVm [degrees]15.8 FOVi [degrees]34.2FOVm [degrees]31.6 Object distance [mm]∞ Object distance [mm]250,000 D0 [mm]∞D0 [mm]250,000 D1 [mm] 2.956D1 [mm] 1.100 D2 [mm] 6.586 D2 [mm] 8.442 With the exception of D0 and D1, the optical data in Table 7B are the same as those of the first embodiment. In addition to the first and second states, the optical imaging lens system of this embodiment can also have other focal lengths for different object distances under different focusing conditions, corresponding to the intermediate range between the first and second states. Surface #4567 k =-2.70326E-01-9.43741E-011.05891E+00-2.01253E+00 A4 =1.0351078E-031.5488457E-02-1.8335070E-03-1.3821491E-02 A6 =5.7461168E-04-1,1023549E-031,1749646E-032,4831156E-03 A8 =1.4183757E-052,2200719E-04-3,3059458E-04-8,3685961E-04 A10 =-2,1876030E-05-6,4436246E-054,2545998E-052,8993680E-04 A12 =3,6369648E-061,0914790E-05-7,7087833E-06-6,8046090E-05 A14 =-2.9416525E-07-1.0619986E-061.6852949E-069.9842548E-06 A16 =1.2326498E-085.9745820E-08-2.3674778E-07-9.1606641E-07 A18 =-2.2303332E-10-1.8541183E-091.8485752E-085.1379827E-08 A20 =-2.4998159E-11-7.4191873E-10-1.6126468E-09 A22 =--1.1939472E-112.1648871E-11 Surface #891011 k =5.74156E+000.00000E+000.00000E+00-1.44674E+01 A4 =1.8836653E-021.6009373E-02-2.0983688E-041.7926498E-03 A6 =-5.1013318E-03-3.3428969E-03-1.7035461E-04-5.9011254E-04 A8 =8.2494547E-047,2456894E-042,6560104E-057,2125848E-05 A10 =-2.3440204E-05-1.2777916E-04-3.2858147E-063.9414894E-06 A12 =-1.7500668E-051.4511616E-051.4354145E-07-2.0717343E-06 A14 =3.3837506E-06-1.0149996E-063.5858096E-102.2061118E-07 A16 =-2.8548935E-074.0115566E-08-1.2953554E-10-1.0282001E-08 A18 =1.1891551E-08-6.840694 7E-10-1.8229562E-10 A20 =-1.9969530E-10--- Surface #13141516 k =-6.74378E-01-6.07173E-02-1.00000E+00-3.75918E-01 A4 =1,3284751E-022,3523155E-03-1,3618316E-02-1,3567165E-02 A6 =-2.7752340E-03-1.0532776E-059.5274589E-049.0071719E-04 A8 =5,3843485E-04-1,0845543E-066,4113986E-07-5,6473452E-05 A10 =-6,1766777E-057,1482017E-06-1,9692495E-052,0296064E-06 A12 =4,1445137E-06-1,4421343E-065,0365058E-06-3,4700726E-08 A14 = -1,5075042E-071,2683561 E-07-7,9056329E-073,4200157E-11 A16 =2,2686043E-09-5,2877834E-098,1453082E-08- A18 = -8,4507460E-11-5,4418962E-09- A20 =--2,2660361E-10- A22 =---5,3310344E-12- A24 =--5,2955668E-14- A26 =--4,4474011E-17- In the 7th embodiment, the equation for the aspherical surface profiles of the aforementioned optical elements is the same as the equation of the 1st embodiment. The definitions of these parameters listed in Table 7D are also the same as those given in the 1st embodiment, with corresponding values ​​for the 7th embodiment; therefore, no further explanation is given here. TL / ImgH4.74(TL-CT1) / CT12.08 TD / ImgH3,63CT2 / T120.50 f / f21.85CT2 / CT31.00 f / f4-1.62T34 / CT40.26 f / f2340.09(CT2+CT3+CT4+CT5+CT6+CT7) / CT10.77 |TLi-TLm| / TLi0.00V2 / V10.88 R5 / R30,36V6 / V70,42 |R9 / R3|0.50CT2 / SAG2R10.90 (R7+R8) / (R7-R8)1.37SAG6R1 / SAG3R2-1.38 |R13 / R14|1.04Y1R1 / ImgH1.24 R14 / f0.20Yc71 / Y7R10.77 8. Design Fig. 22 is a schematic view of an image acquisition unit in the first state (focusing at a long distance) and in the second state (focusing at a short distance) according to the 8th embodiment of the present disclosure. Fig. 23 shows, from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit in the first state according to the 8th embodiment. Fig. 24 shows, from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit in the second state according to the 8th embodiment. The upper part of Fig. 22 shows the optical imaging lens system in the first state, and the lower part of Fig. 22 shows the optical imaging lens system in the second state.22 The image acquisition unit 8 comprises the optical imaging lens system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The imaging lens system comprises, in order from an object side to an image side along a beam path, an aperture S1, a first optical element E1, a second optical element E2, a third optical element E3, an aperture S2, a fourth optical element E4, a fifth optical element E5, an aperture S3, a sixth optical element E6, a seventh optical element E7, a filter E8 and an image surface IMG.The optical imaging lens system comprises seven optical elements (E1, E2, E3, E4, E5, E6 and E7), with no additional optical element being arranged between any of the adjacent seven optical elements, wherein the first optical element E1 is a reflecting element and each from the second optical element E2 to the seventh optical element E7 is a lens element. When an imaged object moves from a large distance to a short distance, the optical imaging lens system performs a focusing operation and switches from the first state to the second state. In this embodiment, the large object distance corresponding to the optical imaging lens system in the first state is ∞ (infinity), and the short object distance corresponding to the optical imaging lens system in the second state is 449.675 millimeters. During the focusing operation, the optical imaging lens system adjusts its focal length by displacing the fifth optical element E5, the sixth optical element E6, and the seventh optical element E7 along the optical axis relative to the second optical element E2, the third optical element E3, and the fourth optical element E4. Furthermore, the optical imaging lens system can be adjusted by the focusing operation. In the first state, as shown in the upper part of Fig.22 shown, and are in the second state, as shown in the lower part of Fig. 22. The first optical element E1 with positive refractive power has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The first optical element E1 is made of glass and both the object-side and image-side surfaces are spherical. The second optical element E2, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The second optical element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the second optical element E2 has one inflection point. The image-side surface of the second optical element E2 has two inflection points. The object-side surface of the second optical element E2 has one critical point in an off-axis region. The image-side surface of the second optical element E2 has two critical points in an off-axis region. The third optical element E3, 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 third optical element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the third optical element E3 has an inflection point. The image-side surface of the third optical element E3 has an inflection point. The object-side surface of the third optical element E3 has a critical point in an off-axis region. The fourth optical 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 optical element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the fourth optical element E4 has an inflection point. The fifth optical element E5, 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 fifth optical element E5 is made of plastic material and has both aspherical object-side and image-side surfaces. The object-side surface of the fifth optical element E5 has an inflection point. The image-side surface of the fifth optical element E5 has an inflection point. The object-side surface of the fifth optical element E5 has a critical point in an off-axis region. The image-side surface of the fifth optical element E5 has a critical point in an off-axis region. The sixth optical element E6, 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 sixth optical element E6 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the sixth optical element E6 has an inflection point. The image-side surface of the sixth optical element E6 has an inflection point. The seventh optical element E7, 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 seventh optical element E7 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the seventh optical element E7 has two inflection points. The image-side surface of the seventh optical element E7 has one inflection point. The object-side surface of the seventh optical element E7 has a critical point in an off-axis region. The image-side surface of the seventh optical element E7 has a critical point in an off-axis region. The E8 filter is made of glass and is located between the seventh optical element E7 and the image surface IMG. It does not affect the focal length of the optical imaging lens system. The IS image sensor is located on or near the image surface IMG. In this embodiment, an axial distance between the image-side surface of the fourth optical element E4 and the object-side surface of the fifth optical element E5 is defined as D1. The detailed optical data of the 8th embodiment are shown in Table 8A and Table 8B, and the data of the aspherical surfaces are listed in the following Table 8C. Surface area # Radius of curvature Thickness Material index Abbe # Focal length 0ObjectPlanoD0 1BlendePlano-0,325 2Optical element 130,0708(SPH)10,186Plastic1,57257,528.92 3-32.3069(SPH)0.970 4 Optical element 219.8724(ASP)0.501 Plastic 1.54456.026.60 5-52.7951(ASP)0.030 6Optical element 36.6296(ASP)1.090Plastic1.56637.4-13.87 73,3813(ASP)1,573 8BlendePlano-0,571 9Optical element 412.5317(ASP)4.037Plastic1.51156.89.80 10-7,4352(ASP)D1 11Optical element 5-4.6400(ASP)0.500Plastic1.64222.5-18.28 12-7.9997(ASP)0.408 13BlendePlano0,869 14Optical element 6-20.7461(ASP)2.599Plastic1.70514.0-55.49 15-46.4758(ASP)0.487 16Optical element 74.4499(ASP)1.889Plastic1.61425,6104.47 174,0099(ASP)D2 18FilterPlano0.210Glass1.51764.2- 19Plano0,524 20ImagePlano- Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 1) is 4.609 mm. An effective radius of aperture S2 (surface 8) is 4,160 mm. An effective radius of aperture S3 (surface 13) is 4,200 mm. Focusing on the long distance (First state) Focusing on the short distance (Second state) fi [mm]17.98fm [mm]16.95 Fnoi 1.95 Fnom 1.91 HFOVi [degrees]19.1HFOVm [degrees]19.3 FOVi [degrees]38.2FOVm [degrees]38.6 Object distance [mm]∞ Object distance [mm]449.675 D0 [mm]∞D0 [mm]450,000 D1 [mm] 0.791 D1 [mm] 1.325 D2 [mm] 4.100 D2 [mm] 3.566 With the exception of D1, the optical data in Table 8B are the same as those of the first embodiment. In addition to the first and second states, the optical imaging lens system of this embodiment can also have further focal lengths corresponding to the intermediate range between the first and second states under other focusing conditions for different object distances. Surface #4567 k =3.05261E+009.00000E+011.04248E+00-2.09993E+00 A4 =-1,0711511E-035,4349771E-039,2062687E-04-3,8112023E-04 A6 =9.3686935E-04-1,1170326E-04-1,0667150E-03-6,0480528E-04 A8 = -1.6514759E-041.9953852E-052.1281113E-041.7824183E-04 A10 =1.3221721E-05-1.7517877E-05-3.3242091E-05-3.1058671E-05 A12 =-4,4618153E-073,1654247E-063,3624606E-063,3226075E-06 A14 =-6.1136449E-09-2.7545332E-07-2.0642216E-07-2.2194618E-07 A16 =8.2498186E-101,2902301E-087,1587362E-099,0765656E-09 A18 =-1.5581981E-11-3,1210424E-10-1,2069190E-10-2,0817892E-10 A20 = -3.0621404E-126.1397102E-132.0482658E-12 Surface #9101112 k =5.18833E+000.00000E+000.00000E+00-7.52894E+00 A4 =1.1322923E-03-4.7763994E-053.9509038E-03-1.9095253E-03 A6 = -3,6900041E-049,7103256E-052,7282116E-033,0980951E-03 A8 =5.1736915E-05-1,7425276E-05-7,7489674E-04-7,5228876E-04 A10 =-4,6955373E-061,7733184E-061,2734647E-041,1238001E-04 A12 =2.1830563E-07-1,0832627E-07-1,4393089E-05-1,2027559E-05 A14 =-3.0875832E-094,0911532E-091,1593954E-069,4695016E-07 A16 =-8,0851802E-11-8,6563906E-11-6,5196346E-08-5,2907904E-08 A18 =2.1476566E-128.6717917E-132.4192898E-091.9534628E-09 A20 =---5.2966850E-11-4.2191022E-11 A22 =--5.1705861E-133.9982489E-13 Surface #14151617 k =-6.83509E+012.54632E+01-3.05348E-01-7.66727E-01 A4 = -4,8184093E-03-1,6414172E-02-2,5173981E-02-1,2722874E-02 A6 = 1,3211151E-035,2514508E-035,1445891E-031,3253327E-03 A8 =-2.6459927E-04-1.2177265E-03-9.8121679E-04-1.3909466E-04 A10 =3,7350982E-052,1236940E-041,4349355E-041,1113085E-05 A12 =-4,0363700E-06-2,7820853E-05-1,5625893E-05-6,4852406E-07 A14 =3,2742248E-072,6968338E-061,2162280E-062,7036065E-08 A16 =-1.8657685E-08-1.9048717E-07-6.3572679E-08-7.8231375E-10 A18 =7.0361188E-109,6266255E-091,9040661E-091,4925458E-11 A20 = -1.6576155E-11-3.3791901E-10-7.7248751E-12-1.7035199E-13 A22 = 2.2651979E-137.8059162E-12-1.8423867E-129.3185282E-16 A24 = -1.5094705E-15 - 1.0645079E - 137.5792851E-14 - 9.4439168E-19 A26 =-6.4785454E-16-1.3398745E-15- A28 =--9,3884058E-18- In the 8th embodiment, the equation for the aspherical surface profiles of the aforementioned optical elements is the same as the equation of the 1st embodiment. The definitions of these parameters listed in Table 8D are also the same as those given in the 1st embodiment, with corresponding values ​​for the 8th embodiment; therefore, no further explanation is given here. TL / ImgH4.75(TL-CT1) / CT11.96 TD / ImgH3,99CT2 / T120.52 f / f20.68CT2 / CT30.46 f / f41.83T34 / CT40.25 f / f2341.28(CT2+CT3+CT4+CT5+CT6+CT7) / CT11.04 |TLi-TLm| / TLi0.00V2 / V10.97 R5 / R30,33V6 / V70,55 |R9 / R3|0.23CT2 / SAG2R11.62 (R7+R8) / (R7-R8)0.26SAG6R1 / SAG3R2-0.39 |R13 / R14|1.11Y1R1 / ImgH0.73 R14 / f0.22Yc71 / Y7R10.59 9. Design Fig. 25 shows a perspective view of an image acquisition unit according to the 9th embodiment of the present disclosure. In this embodiment, the 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 imaging lens system disclosed in the 1st embodiment, a tube, and a holder (whose reference numerals have been omitted) for holding the optical imaging lens system. However, the lens unit 101 can alternatively be provided with the optical imaging lens system disclosed in other embodiments of the present disclosure, and the present disclosure is not limited thereto.The imaging light is focused in the lens unit 101 of the image acquisition unit 100 in order to generate an image on the image sensor 103 with the help of the drive device 102, which serves for image focusing, and the generated image is then digitally transmitted to other components for further processing. The drive device 102 can have an autofocus function, and various drive configurations can be achieved by using screws, voice coil motors (VCMs), spring mechanisms, or ball mechanisms. The present disclosure is not limited to the focusing methods mentioned above. The drive device 102 is advantageous for achieving a better image position of the lens assembly 101 or the image sensor, so that a clear image of the imaged object can be captured by the lens assembly 101 at different object distances. In addition, movable elements in the image acquisition unit 100 (for example, but not limited to, the first to seventh optical elements in the lens assembly or the image sensor) can also be driven by the drive device 102, so that the movable elements can perform a movement parallel to, inclined to, or perpendicular to the optical axis.However, the present disclosure is not limited to the drive types mentioned above. Furthermore, the image sensor 103 (for example, CMOS or CCD), which can be characterized by high light sensitivity and low noise, is arranged on the image surface of the optical imaging lens system in order to achieve higher image quality. The image stabilizer 104, which may include an accelerometer, a gyroscope, and a Hall-effect sensor, is designed 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 suitable for compensating for pan and tilt movements of the lens unit 101 or the image sensor to reduce motion blur during exposure. 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.In addition, several elements in the image acquisition unit 100 can also be controlled by the drive device 102 in order to compensate for image tilts in a timely manner and thereby also achieve OIS. 10. Design Fig. 26 shows a perspective view of an electronic device according to the 10th embodiment of the present disclosure. Fig. 27 shows another perspective view of the electronic device from Fig. 27. In this embodiment, the electronic device 200 is a smartphone comprising the image acquisition unit 100, an image acquisition unit 100a, an image acquisition unit 100b, an image acquisition unit 100c, and a display unit 201 disclosed in embodiment 9. As shown in Fig. 26, 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 face the same direction, each of the image acquisition units 100, 100a, and 100b having a single focal point. As shown in Fig. 27, 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 comprise the optical imaging lens system of the present disclosure and have a similar configuration to the image acquisition unit 100. In particular, each of the image acquisition units 100a, 100b, and 100c can comprise a lens unit, a drive device, an image sensor, and an image stabilizer, and each of the lens units can comprise an optical lens assembly for photography such as the optical imaging lens system of the present disclosure, a tube, and a holder for holding the optical lens assembly for photography. Image acquisition unit 100 is a telephoto image acquisition unit, image acquisition unit 100a is a wide-angle image acquisition unit, image acquisition unit 100b is an ultra-wide-angle image acquisition unit, and image acquisition unit 100c is a wide-angle image acquisition unit. In this embodiment, image acquisition units 100, 100a, and 100b have different fields of view, so that the electronic device can have 200 different magnification ratios to meet the requirement of an optical zoom function. Furthermore, as shown in Fig. 27, image acquisition unit 100c can have a non-circular aperture, and the lens tube or optical elements in image acquisition unit 100c can have one or more truncated edges at positions on its outer diameter to conform to the non-circular aperture.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 miniaturizing the entire module. Furthermore, the aperture diaphragm within the image acquisition unit 100c can also be non-circular to correspond to the non-circular opening. Details can be found in the description of Figures 34 and 35, which are not repeated here. In this embodiment, the electronic device 200 comprises several image acquisition units 100, 100a, 100b, and 100c, but the present disclosure is not limited to the number and arrangement of the image acquisition units. 11. Design Fig. 28 is a perspective view of an electronic device according to the 11th embodiment of the present disclosure. Fig. 29 is another perspective view of the electronic device from Fig. 28. Fig. 30 is a block diagram of the electronic device from Fig. 28. In this embodiment, the electronic device 300 is a smartphone comprising the image acquisition unit 100, an image acquisition unit 100d, an image acquisition unit 100e, an image acquisition unit 100f, an image acquisition unit 100g, an image acquisition unit 100h, a flash module 301, a focusing aid module 302, an image signal processor 303, a display module 304, and an image software processor 305, as described in the 9th embodiment. The image acquisition unit 100, the image acquisition unit 100d, and the image acquisition unit 100e are arranged on the same side of the electronic device 300. The focusing aid module 302 can be a laser distance meter or a ToF (Time of Flight) module, but the present disclosure is not limited to these.The image acquisition unit 100f, the image acquisition unit 100g, the image acquisition unit 100h, 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 100f, 100g, 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, 100g, and 100h can include the optical imaging lens system of the present disclosure and have a similar configuration to the image acquisition unit 100.Specifically, each of the image acquisition units 100d, 100e, 100f, 100g and 100h 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 lens assembly, such as the optical imaging lens system of the present disclosure, a tube and a holder for holding the optical imaging lens system. Image capture unit 100 is a telephoto image capture unit, image capture unit 100d is a wide-angle image capture unit, image capture unit 100e is an ultra-wide-angle image capture unit, image capture unit 100f is a wide-angle image capture unit, image capture unit 100g is an ultra-wide-angle image capture unit, and image capture unit 100h is a ToF image capture unit. In this embodiment, image capture units 100, 100d, and 100e have different fields of view, so that the electronic device can have 300 different magnification ratios to meet the requirement of an optical zoom function.Furthermore, the image acquisition unit 100 can be a telephoto image acquisition unit with a beam path deflection configuration, such as a reflective element configuration, so that the total path length of the image acquisition unit 100 is not limited by the thickness of the electronic device 300. In addition, the image acquisition unit 100h can determine depth information of the imaged object. In this embodiment, the electronic device 300 comprises multiple image acquisition units 100, 100d, 100e, 100f, 100g, and 100h, 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 306, the light rays are focused in the image acquisition unit 100, image acquisition unit 100d, or image acquisition unit 100e to create images, and the flash module 301 is activated for light assistance. 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 emitted by the focus assist module 302 can be either conventional infrared light or laser light. Additionally, the light rays are focused in the image acquisition unit 100f, 100g, or 100h to create images.The display module 304 can include a touchscreen, and the user can interact with the display module 304 and the image software processor 305, which is equipped with several image capture and processing functions. 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. 12. Design Fig. 31 is a perspective view of an electronic device according to the 12th embodiment of the present disclosure. In this embodiment, the electronic device 400 is a smartphone comprising the image acquisition unit 100 described in the 9th embodiment, an image acquisition unit 100i, an image acquisition unit 100j, an image acquisition unit 100k, an image acquisition unit 100m, an image acquisition unit 100n, an image acquisition unit 100p, an image acquisition unit 100q, an image acquisition unit 100r, a flash module 401, a focusing aid module, an image signal processor, a display module and an image software processor (not shown). The image acquisition units 100, 100i, 100j, 100k, 100m, 100n, 100p, 100q and 100r are arranged on the same side of the electronic device 400, while the display module is arranged on the opposite side of the electronic device 400.Furthermore, each of the image acquisition units 100i, 100j, 100k, 100m, 100n, 100p, 100q and 100r can comprise the optical imaging lens system of the present disclosure and have a similar configuration to the image acquisition unit 100, the details of which are not set forth again. The image acquisition unit 100 is a telephoto image acquisition unit, the image acquisition unit 100i is a telephoto image acquisition unit, the image acquisition unit 100j is a wide-angle image acquisition unit, the image acquisition unit 100k is a wide-angle image acquisition unit, the image acquisition unit 100m is an ultra-wide-angle image acquisition unit, the image acquisition unit 100n is an ultra-wide-angle image acquisition unit, the image acquisition unit 100p is a telephoto image acquisition unit, the image acquisition unit 100q is a telephoto image acquisition unit, and the image acquisition unit 100r is a ToF image acquisition unit. In this embodiment, the image acquisition units 100, 100i, 100j, 100k, 100m, 100n, 100p and 100q have different fields of view, so that the electronic device can have 400 different magnification ratios to meet the requirement of an optical zoom function.Furthermore, each of the image acquisition units 100 and 100i can be a telephoto image acquisition unit having a beam path deflection element configuration, such as a reflective element configuration. Additionally, the image acquisition unit 100r can determine depth information of the imaged object. In this embodiment, the electronic device 400 comprises multiple image acquisition units 100, 100i, 100j, 100k, 100m, 100n, 100p, 100q, and 100r, but the present disclosure is not limited to the number and arrangement of the image acquisition units. When a user takes pictures of an object, the light rays in the image capture unit 100, 100i, 100j, 100k, 100m, 100n, 100p, 100q or 100r are focused to create images, and the flash module 401 is activated to provide additional light.Furthermore, the subsequent processes are carried out in a similar manner to the embodiments mentioned above, and the details thereof are not repeated. The electronic device disclosed above serves only as an example to illustrate a practical application of the present disclosure and is not intended as the scope of application of the image acquisition unit disclosed herein. The foregoing description has been presented for clarification with reference to specific embodiments. It should be noted that TABLES 1A-8D show different data for the various embodiments; however, the data for the different embodiments are derived from experiments. 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 intended uses. The embodiments shown above and the accompanying drawings serve as examples and are neither intended to be exhaustive nor to limit the scope of this disclosure to the forms exactly disclosed. In view of the above teachings, many modifications and variations are possible.

Claims

Optical imaging lens system comprising seven optical elements (E1, E2, E3, E4, E5, E6, E7), wherein the seven optical elements (E1, E2, E3, E4, E5, E6, E7) are arranged in the order from an object side to an image side along a beam path as a first optical element (E1), a second optical element (E2), a third optical element (E3), a fourth optical element (E4), a fifth optical element (E5), a sixth optical element (E6) and a seventh optical element (E7), and each of the seven optical elements (E1, E2, E3, E4, E5, E6, E7) has an object-side surface facing the object side and an image-side surface facing the image side;wherein the first optical element (E1) is a reflective element, the first optical element (E1) further comprising a reflective surface (RF1) arranged between the object-side surface and the image-side surface of the first optical element (E1), and each from the second optical element (E2) to the seventh optical element (E7) being a lens element; wherein the first optical element (E1) has a positive refractive power, the object-side surface of the first optical element (E1) is convex in a paraxial region thereof, the third optical element (E3) has a negative refractive power, the object-side surface of the seventh optical element (E7) is convex in a paraxial region thereof, and at least one inflection point (P) between the object-side surface and the image-side surface of the seventh optical element (E7) has;where TL is an axial distance between the object-side surface of the first optical element (E1) and an image surface (IMG), CT1 is a central thickness of the first optical element (E1), CT2 is a central thickness of the second optical element (E2), R13 is a radius of curvature of the object-side surface of the seventh optical element (E7), R14 is a radius of curvature of the image-side surface of the seventh optical element (E7), T12 is an axial distance between the first optical element (E1) and the second optical element (E2), f is a focal length of the optical imaging lens system, f2 is a focal length of the second optical element (E2), and the following conditions are met: 1.30 < ( TL − CT 1 ) / CT 1 < 3.00 ; 0.60 < | R 13 / R 14 | < 3.00 ; 0.05 < CT 2 / T 12 < 3.00 ; and − 0.80 < f / f 2 < 2.

80. Optical imaging lens system according to claim 1, wherein the object-side surface of the third optical element (E3) is convex in a paraxial region thereof, the image-side surface of the third optical element (E3) is concave in a paraxial region thereof, the object-side surface of the fourth optical element (E4) is convex in a paraxial region thereof, the image-side surface of the seventh optical element (E7) is concave in a paraxial region thereof, and at least one of the object-side surface and the image-side surface of the seventh optical element (E7) has at least one critical point (C) in an off-axis region thereof. Optical imaging lens system according to claim 1, wherein the reflecting element is a prism; wherein the axial distance between the object-side surface of the first optical element (E1) and the image surface (IMG) is TL, the central thickness of the first optical element (E1) is CT1 and the following condition is satisfied: 1.40 < ( TL − CT 1 ) / CT 1 < 2.

60. Optical imaging lens system according to claim 1, wherein an aperture number of the optical imaging lens system is Fno, the radius of curvature of the object-side surface of the seventh optical element (E7) is R13, the radius of curvature of the image-side surface of the seventh optical element (E7) is R14, and the following conditions are met: 1.30 < Fno < 2.80; and 0.90 < | R 13 / R 14 | < 2.

50. Optical imaging lens system according to claim 1, wherein the focal length of the optical imaging lens system is f, a composite focal length of the second optical element (E2), the third optical element (E3) and the fourth optical element (E4) is f234, the central thickness of the second optical element (E2) is CT2, a central thickness of the third optical element (E3) is CT3 and the following conditions are met: − 0.30 < f / f 234 < 2.50 ; and 0.25 < CT 2 / CT 3 < 1.

60. Optical imaging lens system according to claim 1, wherein the focal length of the optical imaging lens system is f, the focal length of the second optical element (E2) is f2, an axial distance between the object-side surface of the first optical element (E1) and the image-side surface of the seventh optical element (E7) is TD, a maximum image height of the optical imaging lens system is ImgH, and the following conditions are met: − 0.30 < f / f 2 < 2.50 ; and 3.00 < TD / ImgH < 4.

50. Optical imaging lens system according to claim 1, wherein the central thickness of the second optical element (E2) is CT2, the axial distance between the first optical element (E1) and the second optical element (E2) is T12, a maximum field of view of the optical imaging lens system is FOV, and the following conditions are met: 0.15 < CT2 / T12 < 2.50; and 18.0 degrees < FOV < 50.0 degrees . Optical imaging lens system according to claim 1, wherein an axial distance between the object-side surface of the first optical element (E1) and the image surface (IMG) of the long-distance focusing optical imaging lens system TLi is, an axial distance between the object-side surface of the first optical element (E1) and the image surface (IMG) of the short-distance focusing optical imaging lens system TLm is, and the following condition is satisfied: 0 ≤ | TLi − TLm | / TLi < 2.0 E − 3. Optical imaging lens system according to claim 1, wherein the focal length of the optical imaging lens system is f, the focal length of the fourth optical element (E4) is f4 and the following condition is met: 0.70 < f / f 4 < 3.

10. Optical imaging lens system according to claim 1, wherein the central thickness of the first optical element (E1) is CT1, the central thickness of the second optical element (E2) is CT2, the central thickness of the third optical element (E3) is CT3, the central thickness of the fourth optical element (E4) is CT4, the central thickness of the fifth optical element (E5) is CT5, the central thickness of the sixth optical element (E6) is CT6, the central thickness of the seventh optical element (E7) is CT7, the Abbe number of the first optical element (E1) is V1, the Abbe number of the second optical element (E2) is V2, and the following conditions are met: 0.50 < (CT2 + CT3 + CT4 + CT5 + CT6 + CT7) / CT1 < 1.40; and 0.20 < V 2 / V 1 < 1.

60. Optical imaging lens system according to claim 1, wherein the radius of curvature of the object-side surface of the second optical element (E2) is R3, the radius of curvature of the object-side surface of the fifth optical element (E5) is R9, and the following condition is met: 0.05 < |R9 / R3| < 2.

00. Optical imaging lens system according to claim 1, wherein a displacement parallel to an optical axis from an axial vertex of the image-side surface of the third optical element (E3) to a position of the maximum effective radius of the image-side surface of the third optical element (E3) is SAG3R2, a displacement parallel to the optical axis from an axial vertex of the object-side surface of the sixth optical element (E6) to a position of the maximum effective radius of the object-side surface of the sixth optical element (E6) is SAG6R1, a maximum effective radius of the object-side surface of the first optical element (E1) is Y1R1, a maximum image height of the imaging lens system is ImgH, and the following conditions are met: − 2.00 < SAG6R 1 / SAG3R 2 < 0.60 ; and 0.45 < Y1R 1 / ImgH < 1.

60. Image acquisition unit (100) comprising: the optical imaging lens system according to claim 1; and an image sensor (103) arranged on the image surface (IMG) of the optical imaging lens system. Optical imaging lens system comprising seven optical elements (E1, E2, E3, E4, E5, E6, E7), wherein the seven optical elements (E1, E2, E3, E4, E5, E6, E7) are arranged in order from an object side to an image side along a beam path as a first optical element (E1), a second optical element (E2), a third optical element (E3), a fourth optical element (E4), a fifth optical element (E5), a sixth optical element (E6) and a seventh optical element (E7), and each of the seven optical elements (E1, E2, E3, E4, E5, E6, E7) has an object-side surface facing the object side and an image-side surface facing the image side;wherein the first optical element (E1) is a reflective element, the first optical element (E1) further comprising a reflective surface (RF1) arranged between the object-side surface and the image-side surface of the first optical element (E1), and each from the second optical element (E2) to the seventh optical element (E7) is a lens element;wherein the first optical element (E1) has a positive refractive power, the object-side surface of the first optical element (E1) is convex in a paraxial region thereof, the third optical element (E3) has a negative refractive power, the object-side surface of the seventh optical element (E7) is convex in a paraxial region thereof, the image-side surface of the seventh optical element (E7) is concave in a paraxial region thereof, and the image-side surface of the seventh optical element (E7) has at least one critical point (C) in an off-axis region thereof;where TL is an axial distance between the object-side surface of the first optical element (E1) and an image surface (IMG), CT1 is a central thickness of the first optical element (E1), CT4 is a central thickness of the fourth optical element (E4), R7 is a radius of curvature of the object-side surface of the fourth optical element (E4), R8 is a radius of curvature of the image-side surface of the fourth optical element (E4), V6 is an Abbe number of the sixth optical element (E6), V7 is an Abbe number of the seventh optical element (E7), T34 is an axial distance between the third optical element (E3) and the fourth optical element (E4), and the following conditions are met: 1.30 < ( TL − CT 1 ) / CT 1 < 3.00 ; − 0.60 < (R 7 + R 8 ) / (R 7 − R 8 ) < 2.50 ; 0.10 < V 6 / V 7 < 1.40 ; and 0 < T 34 / CT 4 < 0.

90. Optical imaging lens system according to claim 14, wherein the object-side surface of the third optical element (E3) is convex in a paraxial region thereof, the image-side surface of the third optical element (E3) is concave in a paraxial region thereof, and the object-side surface of the fourth optical element (E4) is convex in a paraxial region thereof; wherein the axial distance between the object-side surface of the first optical element (E1) and the image surface (IMG) is TL, the central thickness of the first optical element (E1) is CT1, and the following condition is satisfied: 1.50 < (TL − CT1) / CT1 < 2.

40. Optical imaging lens system according to claim 14, wherein the central thickness of the second optical element (E2) is CT2, the axial distance between the first optical element (E1) and the second optical element (E2) is T12, the radius of curvature of the object-side surface of the fourth optical element (E4) is R7, the radius of curvature of the image-side surface of the fourth optical element (E4) is R8, and the following conditions are met: 0.10 < CT2 / T12 < 2.80; and − 0.30 < ( R 7 + R 8 ) / ( R 7 − R 8 ) < 1.

70. Optical imaging lens system according to claim 14, wherein the axial distance between the third optical element (E3) and the fourth optical element (E4) is T34, the central thickness of the fourth optical element (E4) is CT4 and the following condition is met: 0.05 < T 34 / CT 4 < 0.

80. Optical imaging lens system according to claim 14, wherein at least two lens elements of the optical imaging lens system move along an optical axis to perform a focusing operation to correspond to different object distances, and wherein the optical imaging lens system performing the focusing operation captures an image of an object at an object distance of 5000 mm or more or at an object distance of 1000 mm or less. Optical imaging lens system according to claim 18, wherein one of the at least two lens elements is the seventh optical element (E7). Optical imaging lens system according to claim 14, wherein a radius of curvature of the object-side surface of the second optical element (E2) is R3, a radius of curvature of the object-side surface of the third optical element (E3) is R5, the Abbe number of the sixth optical element (E6) is V6, the Abbe number of the seventh optical element (E7) is V7 and the following conditions are met: − 0.55 < R 5 / R 3 < 0.95 ; and 0.15 < V 6 / V 7 < 0.

90. Optical imaging lens system according to claim 14, wherein the axial distance between the object-side surface of the first optical element (E1) and the image surface (IMG) is TL, a maximum image height of the imaging lens system is ImgH and the following condition is met: 4.30 < TL / ImgH < 5.

10. Optical imaging lens system according to claim 14, wherein a central thickness of the second optical element (E2) is CT2, a central thickness of the third optical element (E3) is CT3, a radius of curvature of the image-side surface of the seventh optical element (E7) is R14, a focal length of the optical imaging lens system is f, and the following conditions are met: 0.15 < CT2 / CT3 < 1.80; and 0.08 < R 14 / f < 0.

48. Optical imaging lens system according to claim 14, wherein a central thickness of the second optical element (E2) is CT2, a displacement parallel to an optical axis from an axial vertex of the object-side surface of the second optical element (E2) to a position of the maximum effective radius of the object-side surface of the second optical element (E2) is SAG2R1, and the following condition is satisfied: − 3.50 < CT 2 / SAG 2 R 1 < 1.

80. Optical imaging lens system according to claim 14, wherein the sixth optical element (E6) has a positive refractive power; wherein a vertical distance between a critical point (C) on the object-side surface of the seventh optical element (E7) and an optical axis is Yc71, a maximum effective radius of the object-side surface of the seventh optical element (E7) is Y7R1, and the following condition is satisfied: 0.30 < Yc71 / Y7R1 < 0.

90. Optical imaging lens system according to claim 14, wherein the axial distance between the object-side surface of the first optical element (E1) and the image surface (IMG) is TL, the central thickness of the first optical element (E1) is CT1, a central thickness of the second optical element (E2) is CT2, the central thickness of the fourth optical element (E4) is CT4, the radius of curvature of the object-side surface of the fourth optical element (E4) is R7, the radius of curvature of the image-side surface of the fourth optical element (E4) is R8, a radius of curvature of the object-side surface of the seventh optical element (E7) is R13, a radius of curvature of the image-side surface of the seventh optical element (E7) is R14, an axial distance between the first optical element (E1) and the second optical element (E2) is T12, the axial distance between the third optical element (E3) and the fourth optical element (E4) T34 is,a focal length of the optical imaging lens system f, a focal length of the second optical element (E2) f2, the Abbe number of the sixth optical element (E6) V6, the Abbe number of the seventh optical element (E7) V7, a maximum field of view of the optical imaging lens system FOV, an f-number of the optical imaging lens system Fno, a maximum image height of the optical imaging lens system ImgH, an axial distance between the object-side surface of the first optical element (E1) and the image-side surface of the seventh optical element (E7) TD, and at least one of the following conditions is met: 1.70 ≤ ( TL − CT 1 ) / CT 1 ≤ 2.08 ;, 1.04 ≤ | R 13 / R 14 | ≤ 1.83 ; 0.37 ≤ CT 2 / T 12 ≤ 1.17 ; − 0.07 ≤ f / f 2 ≤ 1.85 ; 0.12 ≤ (R7 + R8) / (R7 − R8) ≤ 1.37; 0.36 ≤ V 6 / V 7 ≤ 0.57 ; 0.22 ≤ T 34 / CT 4 ≤ 0.36 ; 30.0 degrees ≤ FOV ≤ 39.80 degrees ; 1.68 ≤ Fno ≤ 2.36 ; 4.73 ≤ TL / ImgH ≤ 4.98 ; and 3.63 ≤ TD / ImgH ≤ 4.

13. Electronic device (200) comprising: an image acquisition unit (100) with: the optical imaging lens system according to claim 14; and an image sensor (103) arranged on the image surface (IMG) of the optical imaging lens system.

Images