Photographic lens system, image acquisition unit and electronic device

Abstract

Photographic lens system comprising five lens elements (E1, E2, E3, E4 and E5), wherein the five lens elements (E1, E2, E3, E4 and E5) are arranged in the order from an object side to an image side along a ray path as a first lens element (E1), a second lens element (E2), a third lens element (E3), a fourth lens element (E4) and a fifth lens element (E5), wherein each of the five lens elements (E1, E2, E3, E4 and E5) has an object-side surface facing the object side and an image-side surface facing the image side; wherein the first lens element (E1) has a positive refractive power, the second lens element (E2) has a positive refractive power, the object-side surface of the third lens element (E3) is concave in a paraxial region thereof, the image-side surface of the third lens element (E3) is convex in a paraxial region thereof, and the fourth lens element (E4) has a negative refractive power, the object-side surface of the fourth lens element (E4) is concave in a paraxial region thereof, the fifth lens element (E5) has a positive refractive power, the object-side surface of the fifth lens element (E5) is convex in a paraxial region thereof, and the image-side surface of the fifth lens element (E5) is concave in a paraxial region thereof; where an Abbe number of the third lens element (E3) is V3, an Abbe number of the fourth lens element (E4) is V4, a focal length of the third lens element (E3) is f3, a focal length of the fourth lens element (E4) is f4, a focal length of the fifth lens element (E5) is f5, a focal length of the photographic lens system is f, and the following conditions are met: 20.0 < V3 + V4 < 65.0; 0.00 < | f4 / f3 | < 0.80 ; and 1.50 < | f 4 / f | + | f 5 / f | <7.00.

Description

BACKGROUND Subject area

[0001] The present disclosure relates to a photographic lens system, an image acquisition unit and an electronic device, in particular a photographic lens system and an image acquisition unit that can be used in an electronic device. Description of related technology

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

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

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

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

[0006] If the Abbe number of the third lens element is V3, the Abbe number of the fourth lens element is V4, the focal length of the third lens element is f3, the focal length of the fourth lens element is f4, the focal length of the fifth lens element is f5, and the focal length of the photographic lens system is f, then the following conditions are preferably met: 20.0 <V3+V4<65,0; 0.00<|f4 / f3|<0.80; and 1.50<|f4 / f|+|f5 / f|<7.00.

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

[0008] Preferably, the first lens element has a positive refractive power. Preferably, the second lens element has a positive refractive power. Preferably, the object-side surface of the third lens element is concave in a paraxial region. Preferably, the image-side surface of the third lens element is convex in a paraxial region. Preferably, the fourth lens element has a negative refractive power. Preferably, the object-side surface of the fourth lens element is concave in a paraxial region. Preferably, the fifth lens element has a positive refractive power. Preferably, the object-side surface of the fifth lens element is convex in a paraxial region. Preferably, the image-side surface of the fifth lens element is concave in a paraxial region.

[0009] If an Abbe number of the third lens element is V3, an Abbe number of the fourth lens element is V4, an Abbe number of the fifth lens element is V5, a combined focal length of the second and third lens elements is f23, and a focal length of the photographic lens system is f, then the following conditions are preferably met: 20.0 <V3+V4<65,0; 1.15 <f23 / f<5,00; and 25.0 <V5−V4<45,0.

[0010] According to another aspect of the present disclosure, a photographic lens system comprises five lens elements. The five lens elements are, in order from an object side to an image side along a beam path, a first lens element, a second lens element, a third lens element, a fourth lens element, and a fifth lens element. Each of the five lens elements has an object-side surface facing the object side and an image-side surface facing the image side.

[0011] Preferably, the first lens element has a positive refractive power. Preferably, the second lens element has a positive refractive power. Preferably, the object-side surface of the third lens element is concave in a paraxial region. Preferably, the image-side surface of the third lens element is convex in a paraxial region. Preferably, the fourth lens element has a negative refractive power. Preferably, the object-side surface of the fourth lens element is concave in a paraxial region. Preferably, the fifth lens element has a positive refractive power. Preferably, the object-side surface of the fifth lens element is convex in a paraxial region. Preferably, the image-side surface of the fifth lens element is concave in a paraxial region.

[0012] If an Abbe number of the third lens element is V3, an Abbe number of the fourth lens element is V4, a focal length of the photographic lens system is f, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, and a radius of curvature of the object-side surface of the third lens element is R5, then the following conditions are preferably met: 20.0 <V3+V4<65,0; -3.00 <f / R5<1,00; and -2.20 <f5 / f4<−1,00.

[0013] According to another aspect of the present disclosure, an image acquisition unit comprises the aforementioned photographic lens system and an image sensor, wherein the image sensor is arranged on an image surface of the photographic lens system.

[0014] According to another aspect of the present disclosure, an electronic device comprises an image acquisition unit. The image acquisition unit comprises the aforementioned photographic lens system and an image sensor, the image sensor being arranged on an image surface of the photographic lens system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The disclosure can be better understood by reading the following detailed description of the embodiments with reference to the accompanying drawings: Fig. Figure 1 is a schematic view of an image acquisition unit according to the first embodiment of the present disclosure; Fig. Figure 2 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the first embodiment; Fig. Figure 3 is a schematic view of an image acquisition unit according to the second embodiment of the present disclosure; Fig. Figure 4 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the second embodiment; Fig. Figure 5 is a schematic view of an image acquisition unit according to the 3rd embodiment of the present disclosure; Fig. Figure 6 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the 3rd embodiment; Fig. Figure 7 is a schematic view of an image acquisition unit according to the 4th embodiment of the present disclosure; Fig. Figure 8 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the 4th embodiment; Fig. Figure 9 is a schematic view of an image acquisition unit according to the 5th embodiment of the present disclosure; Fig.Figure 10 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the 5th embodiment; Fig. Figure 11 is a schematic view of an image acquisition unit according to the 6th embodiment of the present disclosure; Fig. Figure 12 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the 6th embodiment; Fig. Figure 13 is a schematic view of an image acquisition unit according to the 7th embodiment of the present disclosure; Fig. Figure 14 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the 7th embodiment; Fig. Figure 15 is a schematic view of an image acquisition unit according to the 8th embodiment of the present disclosure; Fig.Figure 16 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the 8th embodiment; Fig. Figure 17 is a schematic view of an image acquisition unit according to the 9th embodiment of the present disclosure; Fig. Figure 18 shows spherical aberration curves, astigmatic field curves and a distortion curve of the image acquisition unit according to the 9th embodiment; Fig. Figure 19 is a perspective view of an image acquisition unit according to the 10th embodiment of the present disclosure; Fig. Figure 20 is a schematic view of an electronic device according to the 11th embodiment of the present disclosure; Fig. Figure 21 is another schematic view of the electronic device in Fig. 20; Fig.Figure 22 is a perspective view of an electronic device according to the 12th embodiment of the present disclosure; Fig. Figure 23 is another perspective view of the electronic device in Fig. 22; Fig. 24 is a block diagram of the electronic device in Fig. 22; Fig. Figure 25 is a perspective view of an electronic device according to the 13th embodiment of the present disclosure; Fig. Figure 26 is a perspective view of an electronic device according to the 14th embodiment of the present disclosure; Fig. Figure 27 shows a schematic view of inflection points and critical points on lens surfaces according to the first embodiment of the present disclosure; Fig.Figure 28 shows a schematic view of a configuration of a light deflection element in a photographic lens system according to an embodiment of the present disclosure; Fig. Figure 29 shows a schematic view of a further configuration of a light deflection element in a photographic lens system according to an embodiment of the present disclosure; and Fig. Figure 30 shows a schematic view of a configuration of two light deflection elements in a photographic lens system according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0016] A photographic lens system comprises five lens elements. These five lens elements, in order from one object side to one image side along a light path, are a first lens element, a second lens element, a third lens element, a fourth lens element, and a fifth lens element. Each of the five lens elements of the photographic lens system has an object-side surface facing the object side and an image-side surface facing the image side.

[0017] The first lens element can have a positive refractive power. This is advantageous for reducing the overall size and improving the light-gathering capacity of the photographic lens system. The object-side surface of the first lens element can be convex in a paraxial region. This is advantageous for increasing the aperture and thus the amount of incident light. The object-side surface of the first lens element can also be concave in a paraxial region. This is advantageous for reducing the thickness of the first lens element and increasing the angle of light gathering. The image-side surface of the first lens element can be convex in a paraxial region. This is advantageous for increasing the positive refractive power of the first lens element and improving its focusing ability. The image-side surface of the first lens element can also be concave in a paraxial region.Therefore, it is advantageous to reduce ghosting or reflected light produced by the object-side and image-side surfaces of the first lens element.

[0018] The second lens element can have a positive refractive power. This is advantageous for distributing the focusing force at the object-side end of the photographic lens system, thereby reducing the generation of aberrations. The object-side surface of the second lens element can be convex in a paraxial region. This is advantageous for adjusting the light path between the first and second lens elements to prevent ghosting or flare. The object-side surface of the second lens element can also be concave in a paraxial region. This is advantageous for controlling the angle of incidence of the marginal rays entering the second lens element, thereby preventing total internal reflection caused by excessively large angles. The image-side surface of the second lens element can also be convex in a paraxial region.Therefore, it is advantageous to increase the light-focusing capability of the second lens element. The image-side surface of the second lens element can also be concave in a paraxial region. Therefore, it is advantageous to increase the combined focal length of the first and second lens elements.

[0019] The third lens element can have a positive refractive power. Therefore, it is advantageous to balance the refractive power of the photographic lens system to reduce distortion. The third lens element can also have a negative refractive power. Therefore, it is advantageous to balance the refractive power of the photographic lens system to reduce axial chromatic aberration. The object-side surface of the third lens element can be concave in a paraxial region. Therefore, it is advantageous for adapting the light path incident on the third lens element to reduce the occurrence of total internal reflection. The image-side surface of the third lens element can be convex in a paraxial region. Therefore, it is advantageous for coordinating with the shape of the object-side surface of the third lens element to reduce the occurrence of total internal reflection.

[0020] The fourth lens element can have a negative refractive power. Therefore, it is advantageous to work in conjunction with the fifth lens element to correct aberrations. The object-side surface of the fourth lens element can be concave in a paraxial region. Therefore, it is advantageous to reduce the spherical aberration of the photographic lens system. The image-side surface of the fourth lens element can be convex in a paraxial region. Therefore, it is advantageous to adjust the surface shape of the fourth lens element to control the angle of incidence of the light entering the fifth lens element. The image-side surface of the fourth lens element can also be concave in a paraxial region. Therefore, it is advantageous to increase the axial distance between the third and fourth lens elements to balance the lens configuration.

[0021] The fifth lens element can have a positive refractive power. Therefore, it is advantageous to provide sufficient light-focusing capability at the image-side end of the photographic lens system to aid in correcting the angle of incidence of the light at the image-side end. The object-side surface of the fifth lens element can be convex in a paraxial region. Therefore, it is advantageous to adapt the surface shape of the fifth lens element to focus light and adjust the rear focal length. The image-side surface of the fifth lens element can be concave in a paraxial region. Therefore, it is advantageous to adapt the surface shape of the fifth lens element to reduce aberrations.

[0022] The photographic lens system can further include an aperture diaphragm located on one object side of the first lens element. This is advantageous for reducing the overall path length of the photographic lens system.

[0023] According to the present disclosure, the image-side surface of the fifth lens element can have at least one inflection point. Therefore, it is advantageous for controlling peripheral image aberrations and simultaneously contributing to miniaturization. See Fig. 27, which shows a schematic view of the inflection points P of the image-side surface of the fifth lens element E5 according to the 1st embodiment of the present disclosure. Fig.Figure 27 shows, in the first embodiment of the present disclosure, the inflection points P located on the image-side surface of the fifth lens element E5, together with the inflection points P on the object-side surface and the image-side surface of the first lens element E1, the image-side surface of the third lens element E3, the object-side surface and the image-side surface of the fourth lens element E4, and the object-side surface of the fifth lens element E5, as an exemplary illustration. However, in various embodiments of the present disclosure, each of the lens surfaces of the lens elements may have one or more inflection points.

[0024] According to the present disclosure, the image-side surface of the fifth lens element can have at least one critical point in an off-axis region thereof. Therefore, it is advantageous to cooperate with the inflection point(s) to improve the control of peripheral image aberrations and further contribute to miniaturization. See Fig. 27, which shows a schematic view of the non-axial critical point C of the image-side surface of the fifth lens element E5 according to the 1st embodiment of the present disclosure. Fig.Figure 27 shows, in the first embodiment of the present disclosure, the non-axial critical point C located on the image-side surface of the fifth lens element E5, together with the non-axial critical points C on the image-side surface of the first lens element E1, the object-side surface of the fourth lens element E4, and the object-side surface of the fifth lens element E5, as an exemplary illustration. However, in various embodiments of the present disclosure, each of the lens surfaces of the lens elements may have one or more critical points in an off-axis region thereof.

[0025] According to the present disclosure, the central thickness of the first lens element can be greater than the average central thickness of all lens elements in the photographic lens system. Therefore, it is advantageous to reduce the size of the photographic lens system, thereby enabling its overall shape to meet miniaturization requirements.

[0026] According to the present disclosure, at least one of the first lens element and the second lens element can be made of glass material. Therefore, it is advantageous to improve the light-gathering ability and refractive power of the first lens element or the second lens element, to adjust the dispersion properties to reduce chromatic aberrations, and also to contribute to a reduction in size.

[0027] If the Abbe number of the third lens element is V3 and the Abbe number of the fourth lens element is V4, the following condition can be satisfied: 20.0 < V3+V4 < 65.0. Therefore, this is advantageous for controlling the dispersion properties between the third and fourth lens elements, allowing the third and fourth lens elements to work together with the second or fifth lens element to reduce chromatic aberration. Furthermore, the following conditions can also be satisfied: 25.0 < V3+V4 < 60.0. Additionally, the following conditions can also be satisfied: 25.0 < V3+V4 < 55.0. Furthermore, the following condition can also be satisfied: 28.0 ≤ V3+V4 ≤ 51.2.

[0028] If the focal length of the third lens element is f3 and the focal length of the fourth lens element is f4, the following condition can be satisfied: 0.00 < |f4 / f3| < 1.00. Therefore, it is advantageous to control the refractive power ratio between the third and fourth lens elements to reduce aberrations. Furthermore, the following conditions can also be satisfied: 0.00 < |f4 / f3| < 0.80. Furthermore, the following conditions can also be satisfied: 0.00 < |f4 / f3| < 0.70. Furthermore, the following conditions can also be satisfied: 0.00 < |f4 / f3| < 0.60. Furthermore, the following condition can also be satisfied: 0.01 ≤ |f4 / f3| ≤ 0.56.

[0029] If the focal length of the fourth lens element is f4, the focal length of the fifth lens element is f5, and the focal length of the photographic lens system is f, the following condition can be satisfied: 1.50 < |f4 / f| + |f5 / f| < 7.00. Therefore, it is advantageous to balance the refractive power of the fourth and fifth lens elements, thereby effectively reducing the rear focal length. Furthermore, the following condition can also be satisfied: 1.60 < |f4 / f| + |f5 / f| < 6.50. Furthermore, the following condition can also be satisfied: 1.80 < |f4 / f| + |f5 / f| < 5.50. Additionally, the following condition can also be satisfied: 2.08 ≤ |f4 / f| + |f5 / f| ≤ 5.24.

[0030] If the combined focal length of the second and third lens elements is f23, and the focal length of the photographic lens system is f, the following condition can be met: 1.15 < f23 / f < 5.00. Therefore, it is advantageous to control the light-focusing capability from the second to the third lens element to improve astigmatism correction. Furthermore, the following conditions can also be met: 1.20 < f23 / f < 4.50. Additionally, the following conditions can also be met: 1.25 < f23 / f < 4.00. Furthermore, the following condition can also be met: 1.30 ≤ f23 / f ≤ 3.87.

[0031] If the Abbe number of the fourth lens element is V4 and the Abbe number of the fifth lens element is V5, the following condition can be met: 25.0 < V5 - V4 < 45.0. Therefore, it is advantageous to control the dispersion difference between the fourth and fifth lens elements to aid in the selection of lens materials that reduce chromatic aberration. Furthermore, the following conditions can also be met: 26.0 < V5 - V4 < 43.0. Additionally, the following condition can also be met: 27.7 ≤ V5 - V4 ≤ 42.0.

[0032] If the focal length of the photographic lens system is f and the radius of curvature of the object-side surface of the third lens element is R5, the following condition can be met: -3.00 < f / R5 < -1.00. Therefore, it is advantageous to adjust the angle of incidence of the light on the object-side surface of the third lens element to increase the field of view and reduce the overall size. Furthermore, the following conditions can also be met: -2.70 < f / R5 < -1.10. Additionally, the following conditions can also be met: -2.20 < f / R5 < -1.20. Furthermore, the following condition can also be met: -2.08 ≤ f / R5 ≤ -1.31.

[0033] If the focal length of the fourth lens element is f4 and the focal length of the fifth lens element is f5, the following condition can be met: -2.20 < f5 / f4 < -1.00. Therefore, it is advantageous to balance the refractive power of the fourth and fifth lens elements, thereby reducing aberrations. Furthermore, the following condition can also be met: -2.10 < f5 / f4 < -1.10. Additionally, the following condition can also be met: -1.90 ≤ f5 / f4 ≤ -1.14.

[0034] If the Abbe number of the third lens element is V3 and the Abbe number of the fourth lens element is V4, the following condition can be met: 0.00 ≤ V4 - V3 < 10.00. Therefore, to control the dispersion difference between the third and fourth lens elements, it is advantageous to select lens materials that will reduce chromatic aberration. Furthermore, the following condition can also be met: 0.00 ≤ V4 - V3 < 9.00.

[0035] If the focal length of the photographic lens system is f and the radius of curvature of the image-side surface of the third lens element is R6, the following condition can be met: -4.00 < f / R6 < -1.00. Therefore, it is advantageous to adjust the light-focusing capability of the image-side surface of the third lens element to increase the field of view and reduce the overall size. Furthermore, the following condition can also be met: -3.00 < f / R6 < -1.50.

[0036] If the radius of curvature of the object-side surface of the third lens element is R5 and the axial distance between the object-side surface of the third lens element and an image surface is Dr5I, the following condition can be satisfied: -1.25 < R5 / Dr5I < -0.20. Therefore, this is advantageous for controlling the angle at which the light reaches the image-side surface of the third lens element. Furthermore, the following condition can also be satisfied: -1.00 < R5 / Dr5I < -0.25.

[0037] If the radius of curvature of the image-side surface of the third lens element is R6 and the axial distance between the image-side surface of the third lens element and the image surface is Dr6I, the following condition can be met: -1.50 < R6 / Dr6I < -0.25. Therefore, reducing the overall size is advantageous for increasing the light-focusing capability. Furthermore, the following condition can also be met: -1.20 < R6 / Dr6I < -0.30.

[0038] If the axial distance between the object-side surface of the first lens element and the image surface is TL, and the maximum image height of the photographic lens system (which can be half the diagonal length of an effective light-sensitive area of ​​an image sensor) is ImgH, the following condition can be satisfied: 1.00 < TL / ImgH < 1.50. Therefore, it is advantageous to control a suitable ratio between the total path length and the image height of the photographic lens system to ensure sufficient image brightness while simultaneously aiming for miniaturization of the photographic lens system. Furthermore, the following condition can also be satisfied: 1.05 < TL / ImgH < 1.40. Additionally, the following condition can also be satisfied: 1.15 < TL / ImgH < 1.35.

[0039] If the axial distance between the object-side surface of the first lens element and the image surface is TL, and the focal length of the photographic lens system is f, the following condition can be satisfied: 1.00 < TL / f < 1.80. Therefore, it is advantageous to balance the overall path length of the photographic lens system and the field of view. Furthermore, the following condition can also be satisfied: 1.20 < TL / f < 1.70. Additionally, the following condition can also be satisfied: 1.30 < TL / f < 1.55.

[0040] If the Abbe number of the fourth lens element is V4 and the Abbe number of the fifth lens element is V5, the following condition can be satisfied: 0.20 < V4 / V5 < 0.60. Therefore, this is advantageous for balancing the dispersion ratio between the fourth and fifth lens elements. Furthermore, the following condition can also be satisfied: 0.24 < V4 / V5 < 0.52.

[0041] If half of the maximum field of view (HFOV) of the photographic lens system is the maximum field of view (40.0 degrees < HFOV < 60.0 degrees), the following condition can be met. Therefore, it is advantageous for the photographic lens system to have a sufficient imaging area to meet the field of view requirements of the application device. Furthermore, the following condition can also be met: 42.0 degrees < HFOV < 55.0 degrees. Additionally, the following condition can also be met: 45.4 degrees ≤ HFOV ≤ 50.2 degrees.

[0042] If the focal length of the photographic lens system is f and the combined focal length of the second, third, fourth, and fifth lens elements is f2345, the following condition can be met: 0.00 < f / f2345 < 1.00. Therefore, it is advantageous to control the refractive power from the second to the fifth lens element and achieve a balance between image quality and miniaturization. Furthermore, the following conditions can also be met: 0.00 < f / f2345 < 0.80. Additionally, the following condition can also be met: 0.00 < f / f2345 < 0.40.

[0043] If the Abbe number of the first lens element is V1 and the Abbe number of the second lens element is V2, the following condition can be satisfied: 100.0 < V1+V2 < 130.0. Therefore, it is advantageous to control the dispersion properties between the first and second lens elements so that they work together with the third or fourth lens element to reduce chromatic aberration. Furthermore, the following condition can also be satisfied: 110.0 < V1+V2 < 125.0.

[0044] If the Abbe number of the second lens element is V2 and the Abbe number of the third lens element is V3, the following condition can be met: 25.0 < V2 - V3 < 45.0. Therefore, to control the dispersion difference between the second and third lens elements, it is advantageous to select lens materials to reduce chromatic aberration. Furthermore, the following condition can also be met: 28.0 < V2 - V3 < 43.0.

[0045] If the focal length of the photographic lens system is f and the focal length of the fifth lens element is f5, the following condition can be met: 0.25 < f / f5 < 1.00. Therefore, it is advantageous to control the refractive power of the fifth lens element to adjust the angle of incidence of light onto the image surface, thereby increasing the illuminance or reducing aberrations. Furthermore, the following condition can also be met: 0.30 < f / f5 < 0.90.

[0046] If the Abbe number of the second lens element is V2 and the Abbe number of the third lens element is V3, the following condition can be met: V3 < V2. Therefore, it is advantageous for the third lens element to have a lower Abbe number (i.e., a higher dispersion) in order to reduce chromatic aberration.

[0047] If the Abbe number of the third lens element is V3 and the Abbe number of the fourth lens element is V4, the following condition can be met: V3 ≤ V4. Therefore, it is advantageous to keep the dispersion of the third and fourth lens elements similar, or to control the third lens element so that it has a lower Abbe number (i.e., a higher dispersion), thereby reducing chromatic aberration.

[0048] If the central thickness of the first lens element is CT1, the central thickness of the second lens element is CT2, the central thickness of the third lens element is CT3, and the central thickness of the fourth lens element is CT4, the following condition can be satisfied: 1.10 < CT1 / [(CT2+CT3+CT4) / 3] < 2.50. Therefore, it is advantageous to control the thickness ratio of the first lens element within the photographic lens system to ensure that the first lens element has sufficient refractive power. Furthermore, the following condition can also be satisfied: 1.10 < CT1 / [(CT2+CT3+CT4) / 3] < 2.20.

[0049] If the sum of the central thicknesses of all lens elements of the photographic lens system is ΣCT and the sum of the axial distances between each of all adjacent lens elements of the photographic lens system is ΣAT, the following condition can be satisfied: 2.00 < ΣCT / ΣAT < 5.00. Therefore, it is advantageous to balance the lens configuration of the photographic lens system to improve the light focusing quality. Furthermore, the following condition can also be satisfied: 2.20 < ΣCT / ΣAT < 4.80.

[0050] If the focal length of the first lens element is f1 and the focal length of the third lens element is f3, the following condition can be satisfied: 0.00 < |f1 / f3| < 1.00. Therefore, it is advantageous to control the refractive power ratio between the third lens element and the first lens element in such a way as to reduce aberrations or axial chromatic aberrations. Furthermore, the following conditions can also be satisfied: 0.00 < |f1 / f3| < 0.80. Additionally, the following condition can also be satisfied: 0.00 < |f1 / f3| < 0.70.

[0051] If the focal length of the second lens element is f2 and the focal length of the third lens element is f3, the following condition can be satisfied: 0.00 < |f2 / f3| < 1.50. Therefore, it is advantageous to control the refractive power ratio between the third and second lens elements to reduce aberrations or distortions. Furthermore, the following conditions can also be satisfied: 0.00 < |f2 / f3| < 1.30. Additionally, the following condition can also be satisfied: 0.00 < |f2 / f3| < 1.10.

[0052] If the focal length of the third lens element is f3 and the focal length of the fifth lens element is f5, the following condition can be satisfied: 0.00 < |f5 / f3| < 1.00. Therefore, it is advantageous to control the refractive power ratio between the third and fifth lens elements to reduce aberrations or coma. Furthermore, the following conditions can also be satisfied: 0.00 < |f5 / f3| < 0.90. Additionally, the following condition can also be satisfied: 0.00 < |f5 / f3| < 0.80.

[0053] If the focal length of the first lens element is f1 and the focal length of the second lens element is f2, the following condition can be met: 0.20 < f1 / f2 < 1.00. Therefore, this is advantageous for increasing the illuminance and reducing aberrations. Furthermore, the following condition can also be met: 0.30 < f1 / f2 < 0.90.

[0054] According to the present disclosure, the above-mentioned features and conditions can be used in numerous combinations to achieve corresponding effects.

[0055] According to the present disclosure, the lens elements of the photographic lens system can be made of either glass or plastic. If the lens elements are made of glass, the refractive power distribution of the photographic lens system can be more flexible, and the influence on the imaging caused by changes in ambient temperature can be reduced. The glass lens element can be manufactured either by grinding or forming. If the lens elements are made of plastic, the manufacturing costs can be effectively reduced. Furthermore, the surfaces of each lens element can be spherical or aspherical. Spherical lens elements are easy to manufacture.The design of aspherical lens elements allows for more control variables to eliminate aberrations and reduce the required number of lens elements, effectively shortening the overall path length of the photographic lens system. Additionally, the aspherical surfaces can be manufactured by plastic injection molding or glass forming.

[0056] According to the present disclosure, if a lens surface is aspherical, it means that the lens surface has an aspherical shape over its entire optically effective area or part(s) thereof.

[0057] According to the present disclosure, the material of one or more lens elements can optionally contain an additive that produces light absorption and interference effects and modifies the transmittance of the lens elements in a specific wavelength range to reduce unwanted scattered light or color deviations. For example, the additive can optionally filter out light in the wavelength range of 600 nm to 800 nm to reduce excessive red light and / or near-infrared light; or optionally filter out light in the wavelength range of 350 nm to 450 nm to prevent excessive blue light and / or near-ultraviolet light from interfering with the final image. The additive can be homogeneously mixed with a plastic material to be used for the production of a plastic lens element from the mixed material by injection molding.Furthermore, the additive can be applied to the lens surfaces to achieve the effects mentioned above.

[0058] According to the present disclosure, both an object-side surface and an image-side surface have a paraxial region and an off-axis region. The paraxial region refers to the region of the surface where light rays travel close to the optical axis, and the off-axis region refers to the region of the surface that is farther from the paraxial region. In particular, unless otherwise specified, if the lens element has a convex surface, the surface in the paraxial region is convex, and if the lens element has a concave surface, the surface in the paraxial region is concave. If a region of refractive power, radius of curvature, or focal point of a lens element is not defined, this means that the region of refractive power, radius of curvature, or focal point of the lens element is located in its paraxial region.

[0059] According to the present disclosure, an inflection point is a point on the surface of the lens element where the surface changes from concave to convex or vice versa. A critical point is a non-axial point on the lens surface where its tangent is perpendicular to the optical axis.

[0060] According to the present disclosure, the image surface of the photographic lens system, based on the corresponding image sensor, can be flat or curved, in particular a curved surface that is concave towards the object side of the photographic lens system.

[0061] According to the present disclosure, an image correction unit, such as an image field flattener, can optionally be arranged between the lens element located closest to the image side of the photographic 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 flat image-side surface, wherein the thin transparent element is arranged near the image surface.

[0062] According to the present disclosure, at least one light deflection element, such as a prism or a mirror, can optionally be provided between an imaged object and the image surface on the beam path, and the surface shape of the prism or mirror can be planar, spherical, aspherical, or free-form, so that the photographic lens system can be more flexible in its spatial arrangement, meaning that the miniaturization of an electronic device is not limited by the overall path length of the photographic lens system. See in particular Fig. 28 and Fig. 29. Fig. Figure 28 shows a schematic view of a configuration of a light deflection element in a photographic lens system according to an embodiment of the present disclosure, and Fig.Figure 29 shows a schematic view of a further configuration of a light deflection element in a photographic lens system according to an embodiment of the present disclosure. Fig. 28 and Fig. 29 The photographic lens system can, in the sequence from an imaged object (not shown in the figures) to an image surface IMG along a beam path, have a first optical axis OA1, a light deflecting element LF, and a second optical axis OA2. The light deflecting element LF can be arranged between the imaged object and a lens group LG of the photographic lens system, as shown in Fig. 28 shown, or arranged between a lens group LG and the image surface IMG of the photographic lens system, as shown in Fig. 29 shown. See also Fig.Figure 30, which shows a schematic view of a configuration of two light deflection elements in a photographic lens system according to an embodiment of the present disclosure. Fig.30. The photographic lens system can have, in the sequence from an imaged object (not shown in the figure) to an image surface IMG along a beam path, a first optical axis OA1, a first light deflecting element LF1, a second optical axis OA2, a second light deflecting element LF2, and a third optical axis OA3. The first light deflecting element LF1 is arranged between the imaged object and a lens group LG of the photographic lens system, the second light deflecting element LF2 is arranged between the lens group LG and the image surface IMG of the photographic lens system, and the direction of propagation of the light along the first optical axis OA1 can be the same direction as the direction of propagation of the light along the third optical axis OA3, as shown in Fig.Figure 30 shows that the photographic lens system can optionally be provided with three or more light deflecting elements, and the present disclosure is not limited to the types, numbers or positions of the light deflecting elements of the embodiments disclosed in the aforementioned figures.

[0063] According to the present disclosure, the photographic lens system can comprise at least one aperture, for example an aperture diaphragm, an anti-glare diaphragm, or a field diaphragm. The anti-glare diaphragm or the field diaphragm can be arranged between an imaged object and the first lens element, between adjacent lens elements, or between the last lens element and the image surface, and serves to eliminate stray light and thereby improve image quality.

[0064] According to the present disclosure, an aperture diaphragm can be configured as a front diaphragm or a central diaphragm. A front diaphragm, positioned between an imaged object and the first lens element, can provide a greater distance between the exit pupil of the photographic lens system and the image surface to create a telecentric effect, thereby improving the image acquisition efficiency of an image sensor (e.g., CCD or CMOS). A central diaphragm, positioned between the first lens element and the image surface, is advantageous for increasing the viewing angle of the photographic lens system, thus providing a wider field of view for it.

[0065] According to the present disclosure, the photographic 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 lens speed.

[0066] According to the present disclosure, the photographic lens system can comprise one or more optical elements for limiting the shape of the light passing through the photographic lens system. Each optical element can be, but is not limited to, a filter, a polarizer, etc., and each optical element can be, but is not limited to, a single element, a composite component, a thin layer, etc. The optical element can be arranged on the object side or the image side of the photographic lens system or between two adjacent lens elements to transmit light in a specific shape and thus meet the application requirements.

[0067] According to the present disclosure, the photographic lens system can comprise at least one optical lens element, an optical element or a support which has at least one surface with a weakly reflective layer.

[0068] The low-reflective layer can effectively reduce stray light caused by light reflection at the interface. The low-reflective layer can be located in an optically inactive region of the object-side surface, the image-side surface of the optical lens element, or at a connection between the object-side and image-side surfaces. The optical element can be a light-blocking element, an annular spacer, a tube element, a coverslip, a blue glass, a filter, a color filter, a beam deflection element (e.g., a reflecting element), a prism, a mirror, etc. The support can be a base for mounting a lens assembly, a microlens mounted on an image sensor, a substrate surrounding the image sensor, a glass plate for protecting the image sensor, etc.

[0069] According to the present disclosure, the photographic lens system can further comprise a light-blocking element. The light-blocking element can have a non-circular aperture, and the non-circular aperture can have different effective radii in different directions perpendicular to the optical axis. Therefore, it is advantageous for the light-blocking element to be coordinated with the shape of non-circular lens elements or aperture diaphragms in order to reduce the size of the photographic lens system and to fully utilize the light passing through the non-circular lens elements or aperture diaphragms, thereby reducing stray light. In addition, the light-blocking element can be provided with a wave-like or serrated structure on the circumference of an inner aperture section thereof.

[0070] According to the present disclosure, the object side and the image side are defined according to the direction of the optical axis, and the axial optical data are calculated along the optical axis. Furthermore, when the optical axis is deflected by a reflecting element, the axial optical data are also calculated along the deflected optical axis.

[0071] In accordance with the above description of the present disclosure, the following specific embodiments are further provided for clarification. 1. Design

[0072] Fig. Figure 1 is a schematic view of an image acquisition unit according to the first embodiment of the present disclosure. Fig. Figure 2 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the first embodiment. Fig.The image acquisition unit 1 comprises the photographic lens system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The photographic lens system comprises, in the order from an object side to an image side along a beam path, an aperture diaphragm ST, a first lens element E1, an aperture S1, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture S2, a fifth lens element E5, a filter E6, and an image surface IMG. The photographic lens system comprises five lens elements (E1, E2, E3, E4, and E5), with no additional lens element arranged between any five adjacent lens elements.

[0073] The first lens element E1, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The first lens element E1 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the first lens element E1 has an inflection point. The image-side surface of the first lens element E1 has an inflection point. The image-side surface of the first lens element E1 has a critical point in an off-axis region.

[0074] The second lens element E2, with positive refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical.

[0075] The third lens element E3, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the third lens element E3 has an inflection point.

[0076] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The fourth lens element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fourth lens element E4 has three inflection points. The image-side surface of the fourth lens element E4 has four inflection points. The object-side surface of the fourth lens element E4 has two critical points in an off-axis region.

[0077] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has two inflection points. The image-side surface of the fifth lens element E5 has two inflection points. The object-side surface of the fifth lens element E5 has two critical points in an off-axis region. The image-side surface of the fifth lens element E5 has one critical point in an off-axis region.

[0078] The E6 filter is made of glass and is located between the fifth lens element E5 and the image surface IMG, without affecting the focal length of the photographic lens system. The IS image sensor is located on or near the image surface IMG of the photographic lens system.

[0079] The average central thickness from the first lens element E1 to the fifth lens element E5 in the photographic lens system is 0.44 mm.

[0080] The equation for the aspherical surface profiles of the above-mentioned lens elements of the first embodiment is as follows: X(Y)=(Y2 / R) / (1+sqrt(1(1+k)×(Y / R)2))+∑i(Ai)×(Yi) , where X is the displacement parallel to the optical axis from an axial vertex on the aspherical surface to a point at a distance Y from the optical axis on the aspherical surface; Y is the vertical distance from the point on the aspherical surface to the optical axis; R is the radius of curvature; k is the conic coefficient; and Ai is the i-th aspherical coefficient, where i can be 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28 and 30 in the embodiments, but is not limited to these.

[0081] In the photographic lens system of the image acquisition unit 1 according to the 1st embodiment, if a focal length of the photographic lens system is f, an aperture number of the photographic lens system is Fno, and half of a maximum field of view of the photographic lens system is HFOV, these parameters have the following values: f = 2.75 millimeters (mm), Fno = 2.23, and HFOV = 47.2 degrees.

[0082] If the maximum field of view of the photographic lens system is FOV, then the following condition is met: FOV = 94.4 degrees.

[0083] If the Abbe number of the third lens element E3 is V3 and the Abbe number of the fourth lens element E4 is V4, then the following condition is satisfied: V3+V4 = 39.9.

[0084] If the Abbe number of the third lens element is E3 V3 and the Abbe number of the fourth lens element is E4 V4, then the following condition is satisfied: V4-V3 = 0.9.

[0085] If the Abbe number of the fourth lens element E4 is V4 and an Abbe number of the fifth lens element E5 is V5, then the following condition is satisfied: V4 / V5 = 0.36.

[0086] If the Abbe number of the fourth lens element is E4 V4 and the Abbe number of the fifth lens element is E5 V5, then the following condition is satisfied: V5-V4 = 35.6.

[0087] If the Abbe number of the first lens element E1 is V1 and the Abbe number of the second lens element E2 is V2, then the following condition is satisfied: V1+V2 = 112.1.

[0088] If the Abbe number of the second lens element is E2 V2 and the Abbe number of the third lens element is E3 V3, then the following condition is satisfied: V2-V3 = 36.5.

[0089] If the central thickness of the first lens element E1 is CT1, the central thickness of the second lens element E2 is CT2, the central thickness of the third lens element E3 is CT3, and the central thickness of the fourth lens element E4 is CT4, then the following condition is satisfied: CT1 / [(CT2+CT3+CT4) / 3] = 1.17.

[0090] If ΣCT is the sum of the central thicknesses of all lens elements of the photographic lens system, and ΣAT is the sum of the axial distances between any of the adjacent lens elements of the photographic lens system, then the following condition is satisfied: ΣCT / ΣAT = 3.82. In this embodiment, ΣCT is the sum of the central thicknesses of the first lens element E1, the second lens element E2, the third lens element E3, the fourth lens element E4, and the fifth lens element E5. In this embodiment, ΣAT is the sum of the axial distances between any two adjacent lens elements from the first lens element E1, the second lens element E2, the third lens element E3, the fourth lens element E4, and the fifth lens element E5. In this embodiment, an axial distance between two adjacent lens elements is a distance in a paraxial region between two adjacent lens surfaces of the two adjacent lens elements.

[0091] If the radius of curvature of the object-side surface of the third lens element E3 is R5 and the axial distance between the object-side surface of the third lens element E3 and the image surface IMG is Dr5I, then the following condition is met: R5 / Dr5I = -0.51.

[0092] If the radius of curvature of the image-side surface of the third lens element E3 is R6 and the axial distance between the image-side surface of the third lens element E3 and the image surface IMG is Dr6I, then the following condition is met: R6 / Dr6I = -0.63.

[0093] If the focal length of the photographic lens system is f and the radius of curvature of the object-side surface of the third lens element E3 is R5, then the following condition is met: f / R5 = -2.05.

[0094] If the focal length of the photographic lens system is f and the radius of curvature of the image-side surface of the third lens element E3 is R6, then the following condition is met: f / R6 = -1.83.

[0095] If the focal length of the photographic lens system is f and the focal length of the fifth lens element E5 is f5, then the following condition is met: f / f5 = 0.79.

[0096] If the focal length of the first lens element E1 is f1 and the focal length of the second lens element E2 is f2, then the following condition is met: f1 / f2 = 0.79.

[0097] If the focal length of the fourth lens element E4 is f4 and the focal length of the fifth lens element E5 is f5, then the following condition is met: f5 / f4 = -1.14.

[0098] If the focal length of the first lens element E1 is f1 and the focal length of the third lens element E3 is f3, then the following condition is met: |f1 / f3| = 0.07.

[0099] If the focal length of the second lens element E2 is f2 and the focal length of the third lens element E3 is f3, then the following condition is met: |f2 / f3| = 0.09.

[0100] If the focal length of the third lens element E3 is f3 and the focal length of the fourth lens element E4 is f4, then the following condition is satisfied: |f4 / f3| = 0.06.

[0101] If the focal length of the photographic lens system is f, the focal length of the third lens element E3 is f3, and the focal length of the fifth lens element E5 is f5, then the following condition is satisfied: |f5 / f3| = 0.06.

[0102] If the focal length of the fourth lens element E4 is f4, the focal length of the fifth lens element E5 is f5, and the focal length of the photographic lens system is f, then the following condition is met: |f4 / f|+|f5 / f| = 2.37.

[0103] If the focal length of the photographic lens system is f and a compound focal length of the second lens element E2, the third lens element E3, the fourth lens element E4 and the fifth lens element E5 is f2345, then the following condition is met: f / f2345 = 0.30.

[0104] If the combined focal length of the second lens element E2 and the third lens element E3 is f23 and the focal length of the photographic lens system is f, then the following condition is met: f23 / f = 2.11.

[0105] If the axial distance between the object-side surface of the first lens element E1 and the image surface is IMG TL and the maximum image height of the photographic lens system is ImgH, then the following condition is met: TL / ImgH = 1.29.

[0106] If the axial distance between the object-side surface of the first lens element E1 and the image surface IMG TL is and the focal length of the photographic lens system is f, then the following condition is met: TL / f = 1.41.

[0107] The detailed optical data of the first embodiment are listed in Table 1A and the aspherical surface data are listed in Table 1B below. TABLE 1A 1. Design f = 2.75 mm, Fno = 2.23, HFOV = 47.2 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture stop Plano -0,120 2 Lens 1 1,4300 (ASP) 0,411 plastic 1,545 56,1 3.90 3 3,9193 (ASP) 0,093 4 Aperture Plano 0,142 5 Lens 2 -200,0000 (ASP) 0,350 plastic 1,544 56,0 4.92 6 -2,6407 (ASP) 0,250 7 Lens 3 -1,3413 (ASP) 0,256 plastic 1,669 19,5 -55.04 8 -1,4985 (ASP) 0,066 9 Lens 4 -1,1247 (ASP) 0,445 plastic 1,660 20,4 -3.05 10 -2,9526 (ASP) -0,143 11 Aperture Plano 0,172 12 Lens 5 0,8126 (ASP) 0,754 plastic 1,544 56,0 3.48 13 0,9589 (ASP) 0,607 14 filter Plano 0,210 Glass 1,517 64,2 - 15 Plano 0,260 16 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 4) is 0.644 mm. An effective radius of aperture S2 (surface 11) is 1.672 mm. TABLE 1B Aspheric coefficients Surface # 2 3 5 6 k = 1,28773E+00 -7,24804E+00 -9,89775E+01 0,00000E+00 A4 = -4,803906232E-02 -1,349740706E-01 -3,767734632E-01 -4,984950547E-01 A6 = -2,240534427E+00 1,404307343E+00 6,167849866E+00 3,864486741E+00 A8 = 7,957020291E+01 -3,981620124E+01 -1,815197671E+02 -7,117291763E+01 A10 = -1,843568441E+03 6,307306096E+02 3,198479075E+03 8,532043585E+02 A12 = 2,781474105E+04 -6,738751843E+03 -3,829369159E+04 -7,056025583E+03 A14 = -2,859672924E+05 4,971179281E+04 3,230097977E+05 4,097195839E+04 A16 = 2,061241252E+06 -2,617444376E+05 -1,965201831E+06 -1,687929811E+05 A18 = -1,057472450E+07 1,016577357E+06 8,723647954E+06 4,944494180E+05 A20 = 3,872514665E+07 -3,000376936E+06 -2,827630222E+07 -1,020829827E+06 A22 = -1,002160957E+08 6,834033053E+06 6,619407838E+07 1,449347491E+06 A24 = 1,784183906E+08 -1,180409451E+07 -1,089644238E+08 -1,344631875E+06 A26 = -2,070335756E+08 1,446738013E+07 1,196495348E+08 7,326564991E+05 A28 = 1,402097948E+08 -1,099951184E+07 -7,868775884E+07 -1,774453037E+05 A30 = -4,172735183E+07 3,824358439E+06 2,344822444E+07 - Surface # 7 8 9 10 k = -1,20288E+00 -8,04109E+00 -5,69137E+00 -1,86799E+00 A4 = -1,256541844E-01 3,328887792E+00 5,044373487E+00 4,817654257E-01 A6 = -1,432927305E+01 -4,415310284E+01 -4,517784611E+01 -4,501526032E+00 A8 = 1,734543343E+02 3,466957825E+02 2,960314844E+02 3,039706316E+01 A10 = -1,158092422E+03 -1,907791691E+03 -1,425283468E+03 -1,134836488E+02 A12 = 4,094495591E+03 7,449109307E+03 5,007547157E+03 2,650206448E+02 A14 = -2,177954033E+02 -2,085387389E+04 -1,297523609E+04 -4,202818296E+02 A16 = -7,632025489E+04 4,225206937E+04 2,504736445E+04 4,727950161E+02 A18 = 4,256142308E+05 -6,205426771E+04 -3,614751428E+04 -3,853834385E+02 A20 = -1,312715326E+06 6,540120706E+04 3,879355699E+04 2,289092957E+02 A22 = 2,626521301E+06 -4,818049697E+04 -3,046516733E+04 -9,825886039E+01 A24 = -3,496177559E+06 2,353408193E+04 1,696836668E+04 2,972335758E+01 A26 = 3,002990262E+06 -6,840329776E+03 -6,333184001E+03 -6,016393606E+00 A28 = -1,511281078E+06 8,943672860E+02 1,417244295E+03 7,319164577E-01 A30 = 3,392315337E+05 - -1,434380240E+02 -4,048020449E-02 Surface # 12 13 k = -1,00000E+00 -1,02137E+00 A4 = -1,367071671E+00 -5,500605152E-01 A6 = 2,905417292E+00 5,785442419E-01 A8 = -4,696109584E+00 -5,166471631E-01 A10 = 5,080913024E+00 3,412768881E-01 A12 = -3,685606061E+00 -1,645542285E-01 A14 = 1,804637913E+00 5,858747687E-02 A16 = -5,911435263E-01 -1,556088979E-02 A18 = 1,249140222E-01 3,075025058E-03 A20 = -1,540511653E-02 -4,410378781E-04 A22 = 7,595510242E-04 4,331356728E-05 A24 = 3,768409601E-05 -2,588443818E-06 A26 = -4,574163084E-06 7,042011108E-08

[0108] Table 1A lists the radius of curvature, thickness, and focal length in millimeters (mm). Surface numbers 0–16 represent the surfaces arranged along the optical axis from the object side to the image side. In Table 1B, k represents the conic coefficient of the aspherical surface profile equation. A4–A30 represent the aspherical coefficients of the 4th to 30th order. The tables shown below for each embodiment are the corresponding schematic parameter and aberration curves, and the definitions in the tables are the same as in Table 1A and Table 1B of the first embodiment. Therefore, no further explanation is given in this regard. 2. Design

[0109] Fig. Figure 3 is a schematic view of an image acquisition unit according to the second embodiment of the present disclosure. Fig.Figure 4 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the second embodiment. Fig. 3 The image acquisition unit 2 comprises the photographic lens system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The photographic lens system comprises, in the order from one object side to one image side along a beam path, an aperture diaphragm ST, a first lens element E1, an aperture S1, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture S2, a fifth lens element E5, a filter E6, and an image surface IMG. The photographic lens system comprises five lens elements (E1, E2, E3, E4, and E5), with no additional lens element arranged between any five adjacent lens elements.

[0110] The first lens element E1, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The first lens element E1 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the first lens element E1 has an inflection point.

[0111] The second lens element E2, with positive refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical.

[0112] The third lens element E3, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the third lens element E3 has an inflection point.

[0113] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The fourth lens element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fourth lens element E4 has three inflection points. The image-side surface of the fourth lens element E4 has five inflection points. The object-side surface of the fourth lens element E4 has two critical points in an off-axis region. The image-side surface of the fourth lens element E4 has two critical points in an off-axis region.

[0114] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has six inflection points. The image-side surface of the fifth lens element E5 has three inflection points. The object-side surface of the fifth lens element E5 has one critical point in an off-axis region. The image-side surface of the fifth lens element E5 has one critical point in an off-axis region.

[0115] The E6 filter is made of glass and is located between the fifth lens element E5 and the image surface IMG. It does not affect the focal length of the photographic lens system. The IS image sensor is located on or near the image surface IMG of the photographic lens system.

[0116] The average central thickness of the first lens element E1 through the fifth lens element E5 in the photographic lens system is 0.47 mm. Furthermore, the central thickness of the first lens element E1 is 0.559 mm, and this central thickness (0.559 mm) is greater than the average central thickness (0.47 mm) of all lens elements in the photographic lens system.

[0117] The detailed optical data of the 2nd embodiment are listed in Table 2A and the aspherical surface data in Table 2B below. TABLE 2A 2. Design f = 2.74 mm, Fno = 2.23, HFOV = 46.8 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture stop Plano -0,068 2 Lens 1 1,7312 (ASP) 0,559 plastic 1,545 56,1 3.08 3 -50,0000 (ASP) 0,026 4 Aperture Plano 0,197 5 Lens 2 -9,6895 (ASP) 0,336 plastic 1,544 56,0 8.06 6 -3,0546 (ASP) 0,221 7 Lens 3 -1,3397 (ASP) 0,365 plastic 1,686 18,4 -54.43 8 -1,5436 (ASP) 0,030 9 Lens 4 -2,9913 (ASP) 0,506 plastic 1,669 19,5 -5.54 10 -16,6087 (ASP) -0,142 11 Aperture Plano 0,171 12 Lens 5 0,8698 (ASP) 0,566 plastic 1,544 56,0 8.84 13 0,8184 (ASP) 0,607 14 filter Plano 0,210 Glass 1,517 64,2 - 15 Plano 0,219 16 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). The effective radius of aperture S1 (surface 4) is 0.691 mm. An effective radius of aperture S2 (surface 11) is 1.817 mm. TABLE 2B Aspheric coefficients Surface # 2 3 5 6 k = 1,34954E+00 0,00000E+00 -4,19381E+01 0,00000E+00 A4 = -1,420244393E-01 -7,229767963E-02 -4,325420192E-01 -7,149458794E-01 A6 = 2,645759734E+00 -5,487037659E+00 7,262606374E-01 5,994580926E+00 A8 = -8,715877290E+01 1,109643240E+02 2,139806969E+01 -9,186814918E+01 A10 = 1,751799197E+03 -1,418724802E+03 -7,617903398E+02 9,982635458E+02 A12 = -2,382766479E+04 1,188985126E+04 1,126262080E+04 -7,421582691E+03 A14 = 2,269243435E+05 -6,757291284E+04 -1,015618698E+05 3,848838936E+04 A16 = -1,544571930E+06 2,644616169E+05 6,173128133E+05 -1,409930599E+05 A18 = 7,590251558E+06 -7,120507741E+05 -2,630916101E+06 3,663527697E+05 A20 = -2,694529430E+07 1,293107087E+06 7,973719409E+06 -6,702852937E+05 A22 = 6,839460726E+07 -1,509654101E+06 -1,712491776E+07 8,432206862E+05 A24 = -1,210176591E+08 1,020270576E+06 2,548971687E+07 -6,933267786E+05 A26 = 1,418587098E+08 -3,023665697E+05 -2,501445488E+07 3,350101282E+05 A28 = -9,913908167E+07 - 1,455704267E+07 -7,202644436E+04 A30 = 3,133491184E+07 - -3,804358474E+06 - Surface # 7 8 9 10 k = -1,99120E+00 0,00000E+00 2,86317E-01 -9,90000E+01 A4 = -7,194400336E-01 3,445603301E+00 4,917221415E+00 1,066990190E+00 A6 = -4,384415227E+00 -4,666285274E+01 -4,822914822E+01 -4,791467276E+00 A8 = 1,006932076E+02 3,606405398E+02 3,169889469E+02 1,448147246E+01 A10 = -9,520460658E+02 -1,933406504E+03 -1,499132720E+03 -3,140944299E+01 A12 = 5,600071169E+03 7,459132121E+03 5,173068111E+03 4,846678138E+01 A14 = -2,193068549E+04 -2,092170141E+04 -1,314673935E+04 -5,394147889E+01 A16 = 5,875141540E+04 4,281949437E+04 2,474756125E+04 4,400387743E+01 A18 = -1,082516705E+05 -6,373836576E+04 -3,452862431E+04 -2,656156602E+01 A20 = 1,349202008E+05 6,810319224E+04 3,548530878E+04 1,187082007E+01 A22 = -1,086075140E+05 -5,079351102E+04 -2,644202462E+04 -3,890527514E+00 A24 = 5,093158946E+04 2,506638919E+04 1,386156599E+04 9,128060302E-01 A26 = -1,056353798E+04 -7,344683402E+03 -4,836736119E+03 -1,458621915E-01 A28 = - 9,661012338E+02 1,006535007E+03 1,427829600E-02 A30 = - - -9,435641326E+01 -6,474280416E-04 Surface # 12 13 k = -1,00000E+00 -1,08598E+00 A4 = -5,663846170E-01 -7,623703849E-01 A6 = -1,146061512E+00 8,177327944E-01 A8 = 5,613025152E+00 -6,414666859E-01 A10 = -1,103117412E+01 3,093400372E-01 A12 = 1,269286861E+01 -6,441114367E-02 A14 = -9,351546671E+00 -1,838988137E-02 A16 = 4,589112296E+00 1,840789261E-02 A18 = -1,520103701E+00 -6,535537146E-03 A20 = 3,364098050E-01 1,325633859E-03 A22 = -4,773419115E-02 -1,604455990E-04 A24 = 3,931382547E-03 1,078123793E-05 A26 = -1,430275414E-04 -3,096108207E-07

[0118] In the second embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the first embodiment. The definitions of these parameters, listed in Table 2C below, are also the same as those given for the first embodiment, with corresponding values ​​for the second embodiment; therefore, no further explanation is given in this regard.

[0119] Furthermore, these parameters from Table 2A and Table 2B can be calculated as the following values ​​and must meet the following conditions: TABLE 2C Values ​​of the optical and physical parameters / definitions f [mm] 2,74 f / R5 -2,05 Fno 2,23 f / R6 -1,78 HFOV [Grade] 46,8 f / f5 0,31 FOV [degrees] 93,6 f1 / f2 0,38 V3+V4 37,9 f5 / f4 -1,60 V4-V3 1,1 |f1 / f3| 0,06 V4 / V5 0,35 |f2 / f3| 0,15 V5-V4 36,5 |f4 / f3| 0,10 V1+V2 112,1 |f5 / f3| 0,16 V2-V3 37,6 |f4 / f|+|f5 / f| 5,24 CT1 / [(CT2+CT3+CT4) / 3] 1,39 f / f2345 0,01 ΣCT / ΣAT 4,64 f23 / f 3,87 R5 / Dr5I -0,53 TL / ImgH 1,29 R6 / Dr6I -0,71 TL / f 1,41 3. Design

[0120] Fig. Figure 5 is a schematic view of an image acquisition unit according to the 3rd embodiment of the present disclosure. Fig.Figure 6 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the third embodiment. Fig. 5 comprises the image acquisition unit 3, the photographic lens system (whose reference numeral is omitted) of the present disclosure, and an image sensor IS. The photographic lens system comprises, in the order from an object side to an image side along a beam path, an aperture diaphragm ST, a first lens element E1, an aperture S1, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture S2, a fifth lens element E5, a filter E6, and an image surface IMG. The photographic lens system comprises five lens elements (E1, E2, E3, E4, and E5), with no additional lens element arranged between any five adjacent lens elements.

[0121] The first lens element E1 with positive refractive power has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The first lens element E1 is made of plastic material and both the object-side and image-side surfaces are aspherical.

[0122] The second lens element E2, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the second lens element E2 has three inflection points.

[0123] The third lens element E3, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the third lens element E3 has an inflection point. The image-side surface of the third lens element E3 has an inflection point. The image-side surface of the third lens element E3 has a critical point in an off-axis region.

[0124] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The fourth lens element E4 is made of plastic material and has both aspheric object-side and image-side surfaces. The object-side surface of the fourth lens element E4 has three inflection points. The image-side surface of the fourth lens element E4 has three inflection points. The object-side surface of the fourth lens element E4 has two critical points in an off-axis region. The image-side surface of the fourth lens element E4 has two critical points in an off-axis region.

[0125] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has four inflection points. The image-side surface of the fifth lens element E5 has two inflection points. The object-side surface of the fifth lens element E5 has one critical point in an off-axis region. The image-side surface of the fifth lens element E5 has one critical point in an off-axis region.

[0126] The E6 filter is made of glass and is located between the fifth lens element E5 and the image surface IMG. It does not affect the focal length of the photographic lens system. The IS image sensor is located on or near the image surface IMG of the photographic lens system.

[0127] The average central thickness from the first lens element E1 to the fifth lens element E5 in the photographic lens system is 0.40 mm.

[0128] The detailed optical data of the 3rd embodiment are listed in Table 3A and the aspherical surface data in Table 3B below. TABLE 3A 3. Design f = 2.49 mm, Fno = 2.44, HFOV = 50.2 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture stop Plano 0,040 2 Lens 1 -100,0000 (ASP) 0,300 plastic 1,545 56,1 9.26 3 -4,8098 (ASP) -0,034 4 Aperture Plano 0,059 5 Lens 2 3,7364 (ASP) 0,354 plastic 1,544 56,0 3.90 6 -4,7331 (ASP) 0,636 7 Lens 3 -0,7829 (ASP) 0,200 plastic 1,705 14,0 -46.64 8 -0,8867 (ASP) 0,095 9 Lens 4 -3,6773 (ASP) 0,334 plastic 1,705 14,0 -5.66 10 -49,1931 (ASP) 0,045 11 Aperture Plano -0,016 12 Lens 5 1,0098 (ASP) 0,806 plastic 1,544 56,0 3.75 13 1,4376 (ASP) 0,607 14 filter Plano 0,210 Glass 1,517 64,2 - 15 Plano 0,239 16 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 4) is 0.623 mm. An effective radius of aperture S2 (surface 11) is 1.825 mm. TABLE 3B Aspheric coefficients Surface # 2 3 5 6 k = -1,95399E-11 0,00000E+00 0,00000E+00 0,00000E+00 A4 = -1,407694764E-01 -1,502199341E+00 -1,237507999E+00 -9,258762338E-02 A6 = -2,072752049E+01 5,601935938E+00 1,173785402E+01 1,869139543E+00 A8 = 9,857448262E+02 5,000336965E+01 -1,388560081E+02 -4,926190508E+01 A10 = -2,970781173E+04 -1,569988950E+03 1,735442243E+03 7,121569602E+02 A12 = 5,955640725E+05 1,983192794E+04 -1,708565802E+04 -6,607546513E+03 A14 = -8,239649249E+06 -1,539309069E+05 1,225918285E+05 4,110806669E+04 A16 = 8,046104607E+07 7,884428743E+05 -6,332332585E+05 -1,759459166E+05 A18 = -5,605702772E+08 -2,703381016E+06 2,340365906E+06 5,239861781E+05 A20 = 2,785491803E+09 6,112337067E+06 -6,107001976E+06 -1,082562055E+06 A22 = -9,745901233E+09 -8,688799498E+06 1,094589104E+07 1,519615631E+06 A24 = 2,330188773E+10 6,973667348E+06 -1,278139106E+07 -1,380676084E+06 A26 = -3,591810342E+10 -2,378875067E+06 8,730492974E+06 7,311449055E+05 A28 = 3,174153336E+10 - -2,639316096E+06 -1,710586654E+05 A30 = -1,195190257E+10 - - - Surface # 7 8 9 10 k = -3,48157E+00 -1,00000E+00 9,51668E-01 0,00000E+00 A4 = -1,094627578E-02 6,438614563E-02 2,116276038E-01 1,084419254E+00 A6 = -3,223307791E+01 -1,276569398E+01 7,139540384E+00 -3,992361166E+00 A8 = 4,835574619E+02 1,887169499E+02 -4,405207566E+01 1,129932307E+01 A10 = -3,762088201E+03 -1,246008658E+03 1,438382947E+02 -2,333607087E+01 A12 = 1,825731025E+04 4,856528445E+03 -3,126204503E+02 3,289938212E+01 A14 = -5,925884155E+04 -1,240371227E+04 4,811264354E+02 -3,160005883E+01 A16 = 1,325550507E+05 2,174778009E+04 -5,354817188E+02 2,092969545E+01 A18 = -2,053565519E+05 -2,660507361E+04 4,333154971E+02 -9,609200871E+00 A20 = 2,165251424E+05 2,260082132E+04 -2,537431206E+02 3,030912261E+00 A22 = -1,482464881E+05 -1,299796212E+04 1,058754362E+02 -6,378404298E-01 A24 = 5,939821836E+04 4,793188234E+03 -3,052070696E+01 8,418723948E-02 A26 = -1,056353846E+04 -1,013930433E+03 5,739000631E+00 -6,139504424E-03 A28 = - 9,259652319E+01 -6,279880901E-01 1,832169115E-04 A30 = - - 2,995628355E-02 -8,399555313E-07 Surface # 12 13 k = -1,00000E+00 -6,90838E-01 A4 = 1,720738681E-01 -3,725652970E-03 A6 = -2,410500220E+00 -5,004619233E-01 A8 = 6,321754973E+00 8,777125823E-01 A10 = -9,511130978E+00 -9,207540848E-01 A12 = 8,879496714E+00 6,376644435E-01 A14 = -5,211909344E+00 -3,004945137E-01 A16 = 1,866728191E+00 9,793286866E-02 A18 = -3,518617014E-01 -2,212408743E-02 A20 = 5,001316720E-03 3,406537664E-03 A22 = 1,303963930E-02 -3,413377645E-04 A24 = -2,827176091E-03 2,006169054E-05 A26 = 2,516230956E-04 -5,243278776E-07 A28 = -8,263214545E-06 - A30 = 1,886178070E-08 -

[0129] In the third embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the first embodiment. The definitions of these parameters, listed in Table 3C below, are also the same as those given for the first embodiment, with corresponding values ​​for the third embodiment; therefore, no further explanation is given in this regard.

[0130] Furthermore, these parameters from Table 3A and Table 3B can be calculated as the following values ​​and must meet the following conditions: TABLE 3C Values ​​of the optical and physical parameters / definitions f [mm] 2,49 f / R5 -3,18 Fno 2,44 f / R6 -2,81 HFOV [Grade] 50,2 f / f5 0,66 FOV [degrees] 100,4 f1 / f2 2,38 V3+V4 28,0 f5 / f4 -0,66 V4-V3 0,0 |f1 / f3| 0,20 V4 / V5 0,25 |f2 / f3| 0,08 V5-V4 42,0 |f4 / f3| 0,12 V1+V2 112,1 |f5 / f3| 0,08 V2-V3 42,0 |f4 / f|+|f5 / f| 3,78 CT1 / [(CT2+CT3+CT4) / 3] 1,01 f / f2345 0,75 ΣCT / ΣAT 2,54 f23 / f 1,86 R5 / Dr5I -0,31 TL / ImgH 1,28 R6 / Dr6I -0,38 TL / f 1,54 4. Design

[0131] Fig. Figure 7 is a schematic view of an image acquisition unit according to the 4th embodiment of the present disclosure. Fig.Figure 8 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the 4th embodiment. Fig. 7 The image acquisition unit 4 comprises the photographic lens system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The photographic lens system comprises, in the order from an object side to an image side along a beam path, an aperture diaphragm ST, a first lens element E1, an aperture S1, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture S2, a fifth lens element E5, a filter E6, and an image surface IMG. The photographic lens system comprises five lens elements (E1, E2, E3, E4, and E5), with no additional lens element arranged between any five adjacent lens elements.

[0132] The first lens element E1, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The first lens element E1 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the first lens element E1 has an inflection point. The image-side surface of the first lens element E1 has an inflection point. The image-side surface of the first lens element E1 has a critical point in an off-axis region.

[0133] The second lens element E2, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the second lens element E2 has an inflection point. The object-side surface of the second lens element E2 has a critical point in an off-axis region.

[0134] The third lens element E3, with positive refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the third lens element E3 has an inflection point.

[0135] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The fourth lens element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fourth lens element E4 has three inflection points. The image-side surface of the fourth lens element E4 has four inflection points. The object-side surface of the fourth lens element E4 has two critical points in an off-axis region.

[0136] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has two inflection points. The image-side surface of the fifth lens element E5 has three inflection points. The object-side surface of the fifth lens element E5 has two critical points in an off-axis region. The image-side surface of the fifth lens element E5 has one critical point in an off-axis region.

[0137] The E6 filter is made of glass and is located between the fifth lens element E5 and the image surface IMG. It does not affect the focal length of the photographic lens system. The IS image sensor is located on or near the image surface IMG of the lens system.

[0138] The average central thickness of the first lens element E1 through the fifth lens element E5 in the photographic lens system is 0.45 mm. Furthermore, the central thickness of the first lens element E1 is 0.477 mm, and this central thickness (0.477 mm) is greater than the average central thickness (0.45 mm) of all lens elements in the photographic lens system.

[0139] The detailed optical data of the 4th embodiment are listed in Table 4A and the aspherical surface data in Table 4B below. TABLE 4A 4. Design f = 2.80 mm, Fno = 2.23, HFOV = 46.6 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture stop Plano -0,093 2 Lens 1 1,4174 (ASP) 0,477 plastic 1,545 56,1 3.57 3 4,6126 (ASP) 0,081 4 Aperture Plano 0,156 5 Lens 2 200,0000 (ASP) 0,343 plastic 1,544 56,0 6.93 6 -3,8431 (ASP) 0,184 7 Lens 3 -1,4278 (ASP) 0,292 plastic 1,669 19,5 76.83 8 -1,5031 (ASP) 0,071 9 Lens 4 -1,0962 (ASP) 0,442 plastic 1,587 28,3 -3.60 10 -2,6134 (ASP) 0,036 11 Aperture Plano 0,010 12 Lens 5 0,7900 (ASP) 0,671 plastic 1,544 56,0 4.38 13 0,8282 (ASP) 0,607 14 filter Plano 0,210 Glass 1,517 64,2 - 15 Plano 0,290 16 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 4) is 0.650 mm. An effective radius of aperture S2 (surface 11) is 1.995 mm. TABLE 4B Aspheric coefficients Surface # 2 3 5 6 k = 2,64819E+00 -2,14596E+01 -9,90000E+01 1,39757E+01 A4 = -1,420887377E-01 -2,059185295E-01 -2,464541853E-01 -2,384143029E-01 A6 = 1,979779696E-01 5,964871276E+00 -2,686774692E-01 -5,583274027E+00 A8 = -1,612141147E+01 -1,932635445E+02 -6,231288921E+00 9,153785029E+01 A10 = 4,449314788E+02 3,879512425E+03 1,794465354E+02 -9,432483196E+02 A12 = -7,982454944E+03 -5,247739617E+04 -2,932547041E+03 6,472214280E+03 A14 = 9,484431581E+04 4,944112325E+05 2,994786050E+04 -3,080622459E+04 A16 = -7,737462836E+05 -3,320520575E+06 -2,071155248E+05 1,037301038E+05 A18 = 4,432495067E+06 1,610046347E+07 1,004450977E+06 -2,480950266E+05 A20 = -1,798999734E+07 -5,648981159E+07 -3,454932115E+06 4,175473586E+05 A22 = 5,146464503E+07 1,420497625E+08 8,378307320E+06 -4,821954173E+05 A24 = -1,014637520E+08 -2,495438178E+08 -1,398197394E+07 3,635011021E+05 A26 = 1,311816541E+08 2,907760253E+08 1,525634825E+07 -1,615406193E+05 A28 = -1,000902946E+08 -2,019002800E+08 -9,785152119E+06 3,235060985E+04 A30 = 3,415250540E+07 6,322039471E+07 2,794328218E+06 - Surface # 7 8 9 10 k = -1,78367E-01 -6,83720E+00 -6,09737E+00 -3,03349E-01 A4 = -4,336819484E-01 2,795915275E+00 5,312447994E+00 3,510999457E-01 A6 = -2,790419532E+00 -2,620922895E+01 -4,193402117E+01 -3,214557699E+00 A8 = -5,826437122E+01 1,080739364E+02 2,346795936E+02 2,489854731E+01 A10 = 1,677942278E+03 -7,008649279E+01 -9,830231441E+02 -9,757705962E+01 A12 = -1,940721001E+04 -1,877704027E+03 3,099310692E+03 2,313775118E+02 A14 = 1,381622080E+05 1,225934177E+04 -7,432072377E+03 -3,673458836E+02 A16 = -6,700711480E+05 -4,255669624E+04 1,364244962E+04 4,105129445E+02 A18 = 2,302678504E+06 9,684494752E+04 -1,913508583E+04 -3,304581361E+02 A20 = -5,681417825E+06 -1,526462612E+05 2,027669202E+04 1,927260454E+02 A22 = 1,001594277E+07 1,684599173E+05 -1,587992599E+04 -8,070212212E+01 A24 = -1,232364926E+07 -1,280673866E+05 8,864580439E+03 2,363863726E+01 A26 = 1,005702479E+07 6,397080472E+04 -3,320122342E+03 -4,594884952E+00 A28 = -4,892554651E+06 -1,890677721E+04 7,446368638E+02 5,320678388E-01 A30 = 1,074041005E+06 2,505192236E+03 -7,532812594E+01 -2,775785723E-02 Surface # 12 13 k = -1,13609E+00 -1,06268E+00 A4 = -1,475112447E+00 -8,000931322E-01 A6 = 3,133724987E+00 1,097294807E+00 A8 = -4,857172560E+00 -1,266820126E+00 A10 = 4,782673910E+00 1,104321787E+00 A12 = -2,753773390E+00 -7,195991809E-01 A14 = 6,046533872E-01 3,529098541E-01 A16 = 3,662017406E-01 -1,308660634E-01 A18 = -3,949704835E-01 3,663850686E-02 A20 = 1,822611567E-01 -7,675448765E-03 A22 = -5,184419273E-02 1,181242767E-03 A24 = 9,624213355E-03 -1,293143026E-04 A26 = -1,142347669E-03 9,515535533E-06 A28 = 7,906263343E-05 -4,215354753E-07 A30 = -2,434440154E-06 8,494456608E-09

[0140] In the fourth embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the first embodiment. The definitions of these parameters, listed in Table 4C below, are also the same as those given for the first embodiment, with corresponding values ​​for the fourth embodiment; therefore, no further explanation is given in this regard.

[0141] Furthermore, these parameters from Table 4A and Table 4B can be calculated as the following values ​​and must meet the following conditions: TABLE 4C Values ​​of the optical and physical parameters / definitions f [mm] 2,80 f / R5 -1,96 Fno 2,23 f / R6 -1,86 HFOV [Grade] 46,6 f / f5 0,64 FOV [degrees] 93,2 f1 / f2 0,51 V3+V4 47,8 f5 / f4 -1,22 V4-V3 8,8 |f1 / f3| 0,05 V4 / V5 0,51 |f2 / f3| 0,09 V5-V4 27,7 |f4 / f3| 0,05 V1+V2 112,1 |f5 / f3| 0,06 V2-V3 36,5 |f4 / f|+|f5 / f| 2,85 CT1 / [(CT2+CT3+CT4) / 3] 1,33 f / f2345 0,20 ΣCT / ΣAT 4,14 f23 / f 2,45 R5 / Dr5I -0,54 TL / ImgH 1,29 R6 / Dr6I -0,64 TL / f 1,38 5. Design

[0142] Fig. Figure 9 is a schematic view of an image acquisition unit according to the 5th embodiment of the present disclosure. Fig.Figure 10 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the 5th embodiment. Fig. 9 The image acquisition unit 5 comprises the photographic lens system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The photographic lens system comprises, in the order from an object side to an image side along a beam path, an aperture diaphragm ST, a first lens element E1, an aperture S1, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture S2, a fifth lens element E5, a filter E6, and an image surface IMG. The photographic lens system comprises five lens elements (E1, E2, E3, E4, and E5), with no additional lens element arranged between any five adjacent lens elements.

[0143] The first lens element E1, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The first lens element E1 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the first lens element E1 has an inflection point. The image-side surface of the first lens element E1 has an inflection point. The image-side surface of the first lens element E1 has a critical point in an off-axis region.

[0144] The second lens element E2, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the second lens element E2 has an inflection point. The image-side surface of the second lens element E2 has an inflection point. The object-side surface of the second lens element E2 has a critical point in an off-axis region. The image-side surface of the second lens element E2 has a critical point in an off-axis region.

[0145] The third lens element E3, with positive refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the third lens element E3 has two inflection points. The image-side surface of the third lens element E3 has one inflection point.

[0146] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The fourth lens element E4 is made of plastic material and has both aspheric object-side and image-side surfaces. The object-side surface of the fourth lens element E4 has three inflection points. The image-side surface of the fourth lens element E4 has three inflection points. The object-side surface of the fourth lens element E4 has two critical points in an off-axis region. The image-side surface of the fourth lens element E4 has two critical points in an off-axis region.

[0147] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has three inflection points. The image-side surface of the fifth lens element E5 has three inflection points. The object-side surface of the fifth lens element E5 has a critical point in an off-axis region. The image-side surface of the fifth lens element E5 has a critical point in an off-axis region.

[0148] The E6 filter is made of glass and is located between the fifth lens element E5 and the image surface IMG. It does not affect the focal length of the photographic lens system. The IS image sensor is located on or near the image surface IMG of the photographic lens system.

[0149] The average central thickness of the first lens element E1 through the fifth lens element E5 in the photographic lens system is 0.46 mm. Furthermore, the central thickness of the first lens element E1 is 0.550 mm, and this central thickness (0.550 mm) is greater than the average central thickness (0.46 mm) of all lens elements in the photographic lens system.

[0150] The detailed optical data of the fifth embodiment are listed in Table 5A and the aspherical surface data in Table 5B below. TABLE 5A 5. Design f = 2.98 mm, Fno = 2.22, HFOV = 45.4 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture stop Plano -0,105 2 Lens 1 1,4738 (ASP) 0,550 plastic 1,545 56,1 4.04 3 3,8631 (ASP) 0,088 4 Aperture Plano 0,139 5 Lens 2 4,5809 (ASP) 0,289 plastic 1,544 56,0 8.86 6 90,5152 (ASP) 0,242 7 Lens 3 -2,2778 (ASP) 0,206 plastic 1,669 19,5 19.32 8 -2,0068 (ASP) 0,103 9 Lens 4 -1,2447 (ASP) 0,434 plastic 1,614 25,6 -2.78 10 -5,2383 (ASP) -0,118 11 Aperture Plano 0,147 12 Lens 5 0,8751 (ASP) 0,834 plastic 1,544 56,0 3.43 13 1,0959 (ASP) 0,600 14 filter Plano 0,210 Glass 1,517 64,2 - 15 Plano 0,246 16 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 4) is 0.666 mm. An effective radius of aperture S2 (surface 11) is 1.763 mm. TABLE 5B Aspheric coefficients Surface # 2 3 5 6 k = 2,41460E+00 3,42543E+00 3,02325E+01 -9,90000E+01 A4 = -1,453374533E-01 -5,314986895E-02 -3,210983619E-01 -3,944181932E-01 A6 = 1,684932420E+00 -3,353529466E+00 5,626638704E+00 5,242178490E+00 A8 = -6,282392977E+01 9,668478429E+01 -1,293786539E+02 -8,080970638E+01 A10 = 1,307590647E+03 -1,814993679E+03 1,860242796E+03 8,051405705E+02 A12 = -1,783455656E+04 2,276888785E+04 -1,847033435E+04 -5,528672825E+03 A14 = 1,662947065E+05 -1,998317630E+05 1,298890557E+05 2,666394585E+04 A16 = -1,089939810E+06 1,257630491E+06 -6,587298755E+05 -9,169952028E+04 A18 = 5,097202181E+06 -5,741334021E+06 2,430192481E+06 2,260405384E+05 A20 = -1,706978910E+07 1,902214505E+07 -6,517180820E+06 -3,966596614E+05 A22 = 4,058041421E+07 -4,523053290E+07 1,255564636E+07 4,842598614E+05 A24 = -6,680218748E+07 7,514440330E+07 -1,690977384E+07 -3,912806577E+05 A26 = 7,233853268E+07 -8,274993300E+07 1,509601505E+07 1,881949765E+05 A28 = -4,631619425E+07 5,423677586E+07 -8,017596536E+06 -4,079611019E+04 A30 = 1,327535096E+07 -1,600834257E+07 1,915657400E+06 - Surface # 7 8 9 10 k = -5,68886E-01 -5,03456E+00 -1,00000E+00 1,29500E+00 A4 = 9,882724198E-02 2,725710206E+00 4,733268925E+00 8,199389568E-01 A6 = -1,046754635E+01 -2,917393656E+01 -3,112498184E+01 -6,103619204E+00 A8 = 7,377874604E+01 1,821373615E+02 1,499793768E+02 3,018720140E+01 A10 = -1,572819067E+02 -8,717317400E+02 -5,464045534E+02 -9,221234138E+01 A12 = -2,066263491E+03 3,238135532E+03 1,489231733E+03 1,855587138E+02 A14 = 2,539770641E+04 -9,176553168E+03 -3,029387752E+03 -2,599287779E+02 A16 = -1,510447611E+05 1,953286496E+04 4,590362422E+03 2,617490519E+02 A18 = 5,787217326E+05 -3,069581827E+04 -5,144996392E+03 -1,924049585E+02 A20 = -1,521262384E+06 3,483391680E+04 4,197736767E+03 1,034523607E+02 A22 = 2,776368472E+06 -2,762080961E+04 -2,418916714E+03 -4,025152347E+01 A24 = -3,462851344E+06 1,447118533E+04 9,313680037E+02 1,103239202E+01 A26 = 2,817570682E+06 -4,490787344E+03 -2,146117619E+02 -2,020126336E+00 A28 = -1,348155814E+06 6,239021548E+02 2,233460540E+01 2,218033006E-01 A30 = 2,877681847E+05 - - -1,104260985E-02 Surface # 12 13 k = -1,07969E+00 -1,00000E+00 A4 = -1,052574722E+00 -4,781818310E-01 A6 = 8,676943618E-01 4,496159601E-01 A8 = 1,565143962E+00 -4,337612814E-01 A10 = -6,323315255E+00 4,150554349E-01 A12 = 1,013710508E+01 -3,455580523E-01 A14 = -9,956469682E+00 2,172314609E-01 A16 = 6,619199319E+00 -9,714751455E-02 A18 = -3,094067787E+00 3,037675637E-02 A20 = 1,030111899E+00 -6,567789845E-03 A22 = -2,432120513E-01 9,603605478E-04 A24 = 3,980973245E-02 -9,055377659E-05 A26 = -4,296552600E-03 4,966208265E-06 A28 = 2,749846545E-04 -1,202978680E-07 A30 = -7,903570735E-06 -

[0151] In the 5th embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the 1st embodiment. The definitions of these parameters, listed in Table 5C below, are also the same as those given for the 1st embodiment, with corresponding values ​​for the 5th embodiment; therefore, no further explanation is given in this regard.

[0152] Furthermore, these parameters from Table 5A and Table 5B can be calculated as the following values ​​and must meet the following conditions: TABLE 5C Values ​​of the optical and physical parameters / definitions f [mm] 2,98 f / R5 -1,31 Fno 2,22 f / R6 -1,49 HFOV [Grade] 45,4 f / f5 0,87 FOV [degrees] 90,8 f1 / f2 0,46 V3+V4 45,1 f5 / f4 -1,23 V4-V3 6,1 |f1 / f3| 0,21 V4 / V5 0,46 |f2 / f3| 0,46 V5-V4 30,4 |f4 / f3| 0,14 V1+V2 112,1 |f5 / f3| 0,18 V2-V3 36,5 |f4 / f|+|f5 / f| 2,08 CT1 / [(CT2+CT3+CT4) / 3] 1,78 f / f2345 0,19 ΣCT / ΣAT 3,85 f23 / f 2,13 R5 / Dr5I -0,86 TL / ImgH 1,26 R6 / Dr6I -0,82 TL / f 1,33 6. Design

[0153] Fig. Figure 11 is a schematic view of an image acquisition unit according to the 6th embodiment of the present disclosure. Fig.Figure 12 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the 6th embodiment. Fig. 11 The image acquisition unit 6 comprises the photographic lens system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The photographic lens system comprises, in the order from an object side to an image side along a beam path, an aperture diaphragm ST, a first lens element E1, an aperture S1, a second lens element E2, an aperture S2, a third lens element E3, a fourth lens element E4, an aperture S3, a fifth lens element E5, a filter E6, and an image surface IMG. The photographic lens system comprises five lens elements (E1, E2, E3, E4, and E5), with no additional lens element arranged between any five adjacent lens elements.

[0154] The first lens element E1, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The first lens element E1 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the first lens element E1 has two inflection points. The image-side surface of the first lens element E1 has one inflection point. The image-side surface of the first lens element E1 has a critical point in an off-axis region.

[0155] The second lens element E2, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the second lens element E2 has an inflection point. The object-side surface of the second lens element E2 has a critical point in an off-axis region.

[0156] The third lens element E3, with positive refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the third lens element E3 has an inflection point.

[0157] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The fourth lens element E4 is made of plastic material and has both aspheric object-side and image-side surfaces. The object-side surface of the fourth lens element E4 has three inflection points. The image-side surface of the fourth lens element E4 has three inflection points. The object-side surface of the fourth lens element E4 has two critical points in an off-axis region. The image-side surface of the fourth lens element E4 has two critical points in an off-axis region.

[0158] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has three inflection points. The image-side surface of the fifth lens element E5 has three inflection points. The object-side surface of the fifth lens element E5 has two critical points in an off-axis region. The image-side surface of the fifth lens element E5 has one critical point in an off-axis region.

[0159] The E6 filter is made of glass and is located between the fifth lens element E5 and the image surface IMG. It does not affect the focal length of the photographic lens system. The IS image sensor is located on or near the image surface IMG of the photographic lens system.

[0160] The average central thickness of the first lens element E1 through the fifth lens element E5 in the photographic lens system is 0.49 mm. Furthermore, the central thickness of the first lens element E1 is 0.505 mm, and this central thickness (0.505 mm) is greater than the average central thickness (0.49 mm) of all lens elements in the photographic lens system.

[0161] The detailed optical data of the 6th embodiment are listed in Table 6A and the aspherical surface data in Table 6B below. TABLE 6A 6. Design f = 3.17 mm, Fno = 1.98, HFOV = 47.2 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture stop Plano -0,196 2 Lens 1 1,5702 (ASP) 0,505 plastic 1,545 56,1 4.35 3 4,1157 (ASP) 0,113 4 Aperture Plano 0,169 5 Lens 2 38,2766 (ASP) 0,398 plastic 1,544 56,0 6.88 6 -4,1323 (ASP) -0,146 7 Aperture Plano 0,423 8 Lens 3 -1,5299 (ASP) 0,213 plastic 1,669 19,5 346.77 9 -1,6047 (ASP) 0,071 10 Lens 4 -1,6035 (ASP) 0,523 plastic 1,614 25,6 -4.07 11 -5,0319 (ASP) -0,130 12 Aperture Plano 0,160 13 Lens 5 1,0337 (ASP) 0,832 plastic 1,544 56,0 5.02 14 1,1918 (ASP) 0,660 15 filter Plano 0,231 Glass 1,517 64,2 - 16 Plano 0,320 17 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 4) is 0.766 mm. An effective radius of aperture S2 (surface 7) is 0.896 mm. An effective radius of aperture S3 (surface 12) is 2.061 mm. TABLE 6B Aspheric coefficients Surface # 2 3 5 6 k = 1,58009E+00 1,46354E+01 9,90000E+01 -3,36024E+01 A4 = -6,439915964E-02 -1,039845234E-01 -2,698867999E-01 -2,048524636E-01 A6 = -1,494831054E-01 1,446317798E+00 5,055437968E+00 -5,919159651E-01 A8 = 5,554076881E+00 -3,244458281E+01 -9,141846087E+01 8,276602103E+00 A10 = -9,422991009E+01 4,502064546E+02 1,043516257E+03 -6,642050344E+01 A12 = 8,761345506E+02 -4,275344621E+03 -8,128350350E+03 3,367216846E+02 A14 = -5,201638609E+03 2,855729452E+04 4,463442457E+04 -1,140717223E+03 A16 = 2,085554075E+04 -1,367595612E+05 -1,764621530E+05 2,612979428E+03 A18 = -5,763453203E+04 4,740519562E+05 5,075986586E+05 -4,013539094E+03 A20 = 1,093020081E+05 -1,189602570E+06 -1,062875175E+06 4,011744924E+03 A22 = -1,376946665E+05 2,138102718E+06 1,602349827E+06 -2,445296681E+03 A24 = 1,057495733E+05 -2,681691386E+06 -1,693408752E+06 7,909690667E+02 A26 = -3,783249823E+04 2,228509697E+06 1,190149140E+06 -9,398466283E+01 A28 = -3,407776276E+03 -1,102610707E+06 -4,994198830E+05 - A30 = 5,143340448E+03 2,459103729E+05 9,465118877E+04 - Surface # 8 9 10 11 k = -3,41455E+00 0,00000E+00 -1,00000E+00 -5,74171E+00 A4 = -6,604661729E-02 2,276294419E+00 3,546875616E+00 5,418302294E-01 A6 = -7,579825452E+00 -1,642242035E+01 -1,987909406E+01 -2,924842173E+00 A8 = 1,014946564E+02 6,287961909E+01 7,474603054E+01 1,058824062E+01 A10 = -1,003440785E+03 -1,555569654E+02 -2,016100776E+02 -2,473526636E+01 A12 = 7,050566932E+03 2,622847754E+02 3,999962151E+02 3,933675930E+01 A14 = -3,450323631E+04 -3,036699389E+02 -5,917442150E+02 -4,455046247E+01 A16 = 1,190459777E+05 2,378931409E+02 6,547432191E+02 3,682361567E+01 A18 = -2,933532588E+05 -1,207995091E+02 -5,386401848E+02 -2,244020879E+01 A20 = 5,183795011E+05 3,599065145E+01 3,243110457E+02 1,007112093E+01 A22 = -6,515303269E+05 -4,788744042E+00 -1,386850082E+02 -3,287087678E+00 A24 = 5,682168199E+05 - 3,985838655E+01 7,587192966E-01 A26 = -3,266156033E+05 - -6,896115189E+00 -1,173614282E-01 A28 = 1,111793151E+05 - 5,419465223E-01 1,091180378E-02 A30 = -1,696029016E+04 - - -4,607990295E-04 Surface # 13 14 k = -1,06155E+00 -1,00000E+00 A4 = -5,799392460E-01 -3,325119483E-01 A6 = 6,841874147E-02 2,374952072E-01 A8 = 1,285960189E+00 -1,870330584E-01 A10 = -2,861104415E+00 1,548270958E-01 A12 = 3,433041215E+00 -1,117685792E-01 A14 = -2,700636250E+00 5,990889418E-02 A16 = 1,479306055E+00 -2,257044411E-02 A18 = -5,778325753E-01 5,904288889E-03 A20 = 1,620042147E-01 -1,063482562E-03 A22 = -3,236216430E-02 1,291840035E-04 A24 = 4,496642556E-03 -1,009826377E-05 A26 = -4,130899141E-04 4,583611527E-07 A28 = 2,256073813E-05 -9,176042901E-09 A30 = -5,547393565E-07 -

[0162] In the 6th embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the 1st embodiment. The definitions of these parameters, listed in Table 6C below, are also the same as those given for the 1st embodiment, with corresponding values ​​for the 6th embodiment; therefore, no further explanation is given in this regard.

[0163] Furthermore, these parameters from Table 6A and Table 6B can be calculated as the following values ​​and must meet the following conditions: TABLE 6C Values ​​of the optical and physical parameters / definitions f [mm] 3,17 f / R5 -2,08 Fno 1,98 f / R6 -1,98 HFOV [Grade] 47,2 f / f5 0,63 FOV [degrees] 94,4 f1 / f2 0,63 V3+V4 45,1 f5 / f4 -1,23 V4-V3 6,1 |f1 / f3| 0,01 V4 / V5 0,46 |f2 / f3| 0,02 V5-V4 30,4 |f4 / f3| 0,01 V1+V2 112,1 |f5 / f3| 0,01 V2-V3 36,5 |f4 / f|+|f5 / f| 2,86 CT1 / [(CT2+CT3+CT4) / 3] 1,34 f / f2345 0,25 ΣCT / ΣAT 3,74 f23 / f 2,24 R5 / Dr5I -0,53 TL / lmgH 1,23 R6 / Dr6I -0,60 TL / f 1,37 7. Design

[0164] Fig. Figure 13 is a schematic view of an image acquisition unit according to the 7th embodiment of the present disclosure. Fig.Figure 14 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to the 7th embodiment. Fig. 13 The image acquisition unit 7 comprises the photographic lens system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The photographic lens system comprises, in the order from an object side to an image side along a beam path, an aperture diaphragm ST, a first lens element E1, an aperture S1, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture S2, a fifth lens element E5, a filter E6, and an image surface IMG. The photographic lens system comprises five lens elements (E1, E2, E3, E4, and E5), with no additional lens element arranged between any five adjacent lens elements.

[0165] The first lens element E1, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The first lens element E1 is made of glass and both its object-side and image-side surfaces are aspherical. The image-side surface of the first lens element E1 has an inflection point. The image-side surface of the first lens element E1 has a critical point in an off-axis region.

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

[0167] The third lens element E3, with positive refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the third lens element E3 has an inflection point.

[0168] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The fourth lens element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fourth lens element E4 has three inflection points. The image-side surface of the fourth lens element E4 has four inflection points. The object-side surface of the fourth lens element E4 has two critical points in an off-axis region. The image-side surface of the fourth lens element E4 has two critical points in an off-axis region.

[0169] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has three inflection points. The image-side surface of the fifth lens element E5 has three inflection points. The object-side surface of the fifth lens element E5 has two critical points in an off-axis region. The image-side surface of the fifth lens element E5 has one critical point in an off-axis region.

[0170] The E6 filter is made of glass and is located between the fifth lens element E5 and the image surface IMG. It does not affect the focal length of the photographic lens system. The IS image sensor is located on or near the image surface IMG of the photographic lens system.

[0171] The average central thickness of the first lens element E1 through the fifth lens element E5 in the photographic lens system is 0.40 mm. Furthermore, the central thickness of the first lens element E1 is 0.500 mm, and this central thickness (0.500 mm) is greater than the average central thickness (0.40 mm) of all lens elements in the photographic lens system.

[0172] The detailed optical data of the 7th embodiment are listed in Table 7A and the aspherical surface data in Table 7B below. TABLE 7A 7. Design f = 2.80 mm, Fno = 1.88, HFOV = 47.6 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture stop Plano -0,182 2 Lens 1 1,4696 (ASP) 0,500 Glass 1,589 61,2 4.21 3 3,1519 (ASP) 0,119 4 Aperture Plano 0,123 5 Lens 2 42,2599 (ASP) 0,341 plastic 1,544 56,0 6.88 6 -4,0957 (ASP) 0,212 7 Lens 3 -1,6692 (ASP) 0,200 plastic 1,669 19,5 7.01 8 -1,2904 (ASP) 0,047 9 Lens 4 -1,3755 (ASP) 0,251 plastic 1,639 23,5 -2.92 10 -5,6256 (ASP) 0,145 11 Aperture Plano 0,060 12 Lens 5 0,9324 (ASP) 0,692 plastic 1,534 56,0 4.96 13 1,0662 (ASP) 0,600 14 filter Plano 0,210 Glass 1,517 64,2 - 15 Plano 0,276 16 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). The effective radius of aperture S1 (surface 4) is 0.673 mm. An effective radius of aperture S2 (surface 11) is 1,950 mm. TABLE 7B Aspheric coefficients Surface # 2 3 5 6 k = 1,15664E+00 1,12763E+01 9,90000E+01 -2,51876E+01 A4 = -1,351413069E-01 -9,615849656E-02 -2,258815082E-01 -3,301366579E-01 A6 = 2,111053921E+00 1,958263217E+00 1,174198300E+00 9,166981641E-01 A8 = -3,336585102E+01 -8,004467109E+01 -1,828178791E+00 -2,095225762E+01 A10 = 3,163273511E+02 1,714141149E+03 -3,308468657E+02 2,547711464E+02 A12 = -1,818454966E+03 -2,341185250E+04 6,210125142E+03 -1,910805700E+03 A14 = 5,444578696E+03 2,163110923E+05 -6,097082918E+04 9,315933798E+03 A16 = 1,025999568E+03 -1,399006327E+06 3,844270775E+05 -3,048968599E+04 A18 = -8,298612667E+04 6,447880658E+06 -1,661651811E+06 6,770682245E+04 A20 = 3,775311546E+05 -2,128340166E+07 5,040385316E+06 -1,008065930E+05 A22 = -9,384955604E+05 4,991618763E+07 -1,073388094E+07 9,644615717E+04 A24 = 1,457347723E+06 -8,117259813E+07 1,572482802E+07 -5,362241311E+04 A26 = -1,412270854E+06 8,697720828E+07 -1,509040670E+07 1,317134700E+04 A28 = 7,850699359E+05 -5,521104921E+07 8,537466379E+06 - A30 = -1,918160377E+05 1,572338374E+07 -2,157364807E+06 - Surface # 7 8 9 10 k = -3,02412E+00 0,00000E+00 -1,00000E+00 -4,44300E+00 A4 = -3,260130306E-01 2,901249521E+00 4,402769022E+00 3,394100262E-01 A6 = -1,122583392E+01 -2,833456009E+01 -2,986916764E+01 -1,709586579E+00 A8 = 1,763240910E+02 1,760786802E+02 1,459802672E+02 1,120115609E+01 A10 = -1,673689124E+03 -8,452689411E+02 -5,235498346E+02 -4,595270420E+01 A12 = 1,044086506E+04 3,176759295E+03 1,381733982E+03 1,214224003E+02 A14 = -4,265001882E+04 -9,077610860E+03 -2,691269669E+03 -2,222341554E+02 A16 = 1,094832069E+05 1,921399499E+04 3,857836406E+03 2,913810985E+02 A18 = -1,453962620E+05 -2,946714830E+04 -4,034041806E+03 -2,770953680E+02 A20 = -4,270648320E+04 3,188724756E+04 3,024998642E+03 1,910212621E+02 A22 = 5,685576598E+05 -2,330682058E+04 -1,578111970E+03 -9,429941490E+01 A24 = -1,108307014E+06 1,052899490E+04 5,423464539E+02 3,243528971E+01 A26 = 1,115649868E+06 -2,288669023E+03 -1,101634480E+02 -7,372904668E+00 A28 = -6,006898189E+05 -6,357716972E+01 1,000453754E+01 9,946061187E-01 A30 = 1,372805507E+05 9,162093153E+01 - -6,025675596E-02 Surface # 12 13 k = -1,05167E+00 -1,00000E+00 A4 = -9,201092141E-01 -4,371154997E-01 A6 = 1,337558520E+00 3,949017588E-01 A8 = -1,842739517E+00 -4,279068795E-01 A10 = 2,078017195E+00 4,536646830E-01 A12 = -1,747150054E+00 -3,817579144E-01 A14 = 1,041297526E+00 2,330413495E-01 A16 = -4,310348485E-01 -1,010293102E-01 A18 = 1,225339011E-01 3,091145111E-02 A20 = -2,344879581E-02 -6,602944932E-03 A22 = 2,887695231E-03 9,606325009E-04 A24 = -2,068683705E-04 -9,049677100E-05 A26 = 6,557173623E-06 4,966208455E-06 A28 = - -1,202978733E-07

[0173] In the 7th embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the 1st embodiment. The definitions of these parameters, listed in Table 7C below, are also the same as those given for the 1st embodiment, with corresponding values ​​for the 7th embodiment; therefore, no further explanation is given in this regard.

[0174] Furthermore, these parameters from Table 7A and Table 7B can be calculated as the following values ​​and must meet the following conditions: TABLE 7C Values ​​of the optical and physical parameters / definitions f [mm] 2,80 f / R5 -1,68 Fno 1,88 f / R6 -2,17 HFOV [Grade] 47,6 f / f5 0,56 FOV [degrees] 95,2 f1 / f2 0,61 V3+V4 43,0 f5 / f4 -1,70 V4-V3 4,0 |f1 / f3| 0,60 V4 / V5 0,42 |f2 / f3| 0,98 V5-V4 32,5 |f4 / f3| 0,42 V1+V2 117,3 |f5 / f3| 0,71 V2-V3 36,5 |f4 / f|+|f5 / f| 2,81 CT1 / [(CT2+CT3+CT4) / 3] 1,89 f / f2345 0,35 ΣCT / ΣAT 2,81 f23 / f 1,30 R5 / Dr5I -0,67 TL / lmgH 1,19 R6 / Dr6I -0,57 TL / f 1,35 8. Design

[0175] Fig. Figure 15 is a schematic view of an image acquisition unit according to the 8th embodiment of the present disclosure. Fig.Figure 16 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to embodiment 8. Fig. 15 The image acquisition unit 8 comprises the photographic lens system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The photographic lens system comprises, in the order from an object side to an image side along a beam path, an aperture diaphragm ST, a first lens element E1, an aperture S1, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture S2, a fifth lens element E5, a filter E6, and an image surface IMG. The photographic lens system comprises five lens elements (E1, E2, E3, E4, and E5), with no additional lens element arranged between any five adjacent lens elements.

[0176] The first lens element E1, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The first lens element E1 is made of glass and has an object-side surface and an image-side surface that are both aspherical. The object-side surface of the first lens element E1 has an inflection point. The image-side surface of the first lens element E1 has an inflection point. The image-side surface of the first lens element E1 has a critical point in an off-axis region.

[0177] The second lens element E2, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The second lens element E2 is made of glass and both its object-side and image-side surfaces are aspherical. The object-side surface of the second lens element E2 has an inflection point. The object-side surface of the second lens element E2 has a critical point in an off-axis region.

[0178] The third lens element E3, with positive refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The image-side surface of the third lens element E3 has an inflection point.

[0179] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The fourth lens element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fourth lens element E4 has three inflection points. The image-side surface of the fourth lens element E4 has five inflection points. The object-side surface of the fourth lens element E4 has two critical points in an off-axis region. The image-side surface of the fourth lens element E4 has two critical points in an off-axis region.

[0180] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has three inflection points. The image-side surface of the fifth lens element E5 has three inflection points. The object-side surface of the fifth lens element E5 has two critical points in an off-axis region. The image-side surface of the fifth lens element E5 has one critical point in an off-axis region.

[0181] The E6 filter is made of glass and is located between the fifth lens element E5 and the image surface IMG. It does not affect the focal length of the photographic lens system. The IS image sensor is located on or near the image surface IMG of the photographic lens system.

[0182] The average central thickness of the first lens element E1 through the fifth lens element E5 in the photographic lens system is 0.39 mm. Furthermore, the central thickness of the first lens element E1 is 0.500 mm, and this central thickness (0.500 mm) is greater than the average central thickness (0.39 mm) of all lens elements in the photographic lens system.

[0183] The detailed optical data of the 8th embodiment are listed in Table 8A and the aspherical surface data in Table 8B below. TABLE 8A 8. Design f = 2.81 mm, Fno = 1.85, HFOV = 47.6 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture stop Plano -0,188 2 Lens 1 1,4737 (ASP) 0,500 Glass 1,589 61,2 4.24 3 3,1455 (ASP) 0,121 4 Aperture Plano 0,121 5 Lens 2 53,2393 (ASP) 0,330 Glass 1,589 61,2 6.37 6 -4,0282 (ASP) 0,224 7 Lens 3 -1,5851 (ASP) 0,200 plastic 1,669 19,5 8.51 8 -1,3025 (ASP) 0,051 9 Lens 4 -1,5243 (ASP) 0,252 plastic 1,639 23,5 -3.40 10 -5,4347 (ASP) -0,015 11 Aperture Plano 0,240 12 Lens 5 0,9691 (ASP) 0,670 plastic 1,534 56,0 6.45 13 1,0235 (ASP) 0,600 14 filter Plano 0,210 Glass 1,517 64,2 - 15 Plano 0,273 16 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 4) is 0.682 mm. An effective radius of aperture S2 (surface 11) is 1.688 mm. TABLE 8B Aspheric coefficients Surface # 2 3 5 6 k = 1,25346E+00 1,20247E+01 -9,90000E+01 -5,05940E+01 A4 = -1,145193684E-01 -1,100386275E-01 -2,107419071E-01 -3,429255455E-01 A6 = 2,031332702E-01 2,655862691E+00 3,916287149E-01 4,280696822E-01 A8 = 2,030191226E+01 -1,029685999E+02 2,372226847E+01 -8,372118254E+00 A10 = -5,439108836E+02 2,142941738E+03 -7,784510811E+02 1,145722094E+02 A12 = 7,018359011E+03 -2,849728403E+04 1,113202308E+04 -9,776593745E+02 A14 = -5,640564303E+04 2,563999678E+05 -9,720485144E+04 5,303543928E+03 A16 = 3,063788982E+05 -1,613855166E+06 5,697425479E+05 -1,893652492E+04 A18 = -1,165874539E+06 7,233917598E+06 -2,332926561E+06 4,518865717E+04 A20 = 3,150331553E+06 -2,321130336E+07 6,773004841E+06 -7,141746706E+04 A22 = -6,024160210E+06 5,290533023E+07 -1,389775499E+07 7,175482371E+04 A24 = 7,976512909E+06 -8,361020834E+07 1,971625679E+07 -4,148731024E+04 A26 = -6,960953516E+06 8,707865160E+07 -1,839868649E+07 1,050312522E+04 A28 = 3,603296957E+06 -5,374074331E+07 1,015887429E+07 - A30 = -8,384126878E+05 1,488479677E+07 -2,513846009E+06 - Surface # 7 8 9 10 k = -5,21843E+00 0,00000E+00 -1,00000E+00 -8,57930E-02 A4 = -3,061901034E-01 3,005145133E+00 4,135625470E+00 2,020877004E-01 A6 = -7,776987236E+00 -2,779968110E+01 -2,773386793E+01 5,283226444E-03 A8 = 9,128287618E+01 1,447245297E+02 1,248490542E+02 -4,625932301E-01 A10 = -6,474952913E+02 -5,079926290E+02 -3,892854858E+02 1,299549573E+00 A12 = 2,813212497E+03 1,260981516E+03 8,422302151E+02 -4,241603542E+00 A14 = -4,750796624E+03 -2,232996482E+03 -1,247928749E+03 8,751262789E+00 A16 = -2,121479971E+04 2,803931435E+03 1,194376271 E+03 -1,063355936E+01 A18 = 1,720454169E+05 -2,438640419E+03 -5,887846194E+02 7,872856628E+00 A20 = -5,841330286E+05 1,394156464E+03 -9,450394762E+01 -3,529398084E+00 A22 = 1,202823802E+06 -4,692285452E+02 3,583969010E+02 8,801009664E-01 A24 = -1,593045997E+06 7,003390384E+01 -2,423593109E+02 -8,300959833E-02 A26 = 1,331425117E+06 - 7,661287453E+01 -8,796724168E-03 A28 = -6,411809399E+05 - -9,778172653E+00 1,909394769E-03 A30 = 1,358904094E+05 - - - Surface # 12 13 k = -1,03871E+00 -1,00000E+00 A4 = -9,213337450E-01 -5,203169361E-01 A6 = 1,351593093E+00 5,598887842E-01 A8 = -1,858747193E+00 -6,436429550E-01 A10 = 2,086151626E+00 6,531327913E-01 A12 = -1,749279966E+00 -5,163846207E-01 A14 = 1,041577711E+00 3,005070474E-01 A16 = -4,310495017E-01 -1,262502899E-01 A18 = 1,225339007E-01 3,790323647E-02 A20 = -2,344879571E-02 -8,015884592E-03 A22 = 2,887695213E-03 1,162189438E-03 A24 = -2,068683687E-04 -1,096609550E-04 A26 = 6,557173545E-06 6,052617210E-06 A28 = - -1,480003071E-07

[0184] In the 8th embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the 1st embodiment. The definitions of these parameters, listed in Table 8C below, are also the same as those given for the 1st embodiment, with corresponding values ​​for the 8th embodiment; therefore, no further explanation is given in this regard.

[0185] Furthermore, these parameters from Table 8A and Table 8B can be calculated as the following values ​​and must meet the following conditions: TABLE 8C Values ​​of the optical and physical parameters / definitions f [mm] 2,81 f / R5 -1,78 Fno 1,85 f / R6 -2,16 HFOV [Grade] 47,6 f / f5 0,44 FOV [degrees] 95,2 f1 / f2 0,67 V3+V4 43,0 f5 / f4 -1,90 V4-V3 4,0 |f1 / f3| 0,50 V4 / V5 0,42 |f2 / f3| 0,75 V5-V4 32,5 |f4 / f3| 0,40 V1+V2 122,6 |f5 / f3| 0,76 V2-V3 41,8 |f4 / f|+|f5 / f| 3,50 CT1 / [(CT2+CT3+CT4) / 3] 1,92 f / f2345 0,33 ΣCT / ΣAT 2,63 f23 / f 1,36 R5 / Dr5I -0,64 TL / lmgH 1,18 R6 / Dr6I -0,57 TL / f 1,34 9. Design

[0186] Fig. Figure 17 is a schematic view of an image acquisition unit according to the 9th embodiment of the present disclosure. Fig.Figure 18 shows, in order from left to right, spherical aberration curves, astigmatic field curves, and a distortion curve of the image acquisition unit according to embodiment 9. Fig. 17 The image acquisition unit 9 comprises the photographic lens system (whose reference numeral is omitted) of the present disclosure and an image sensor IS. The photographic lens system comprises, in the order from an object side to an image side along a beam path, an aperture diaphragm ST, a first lens element E1, an aperture S1, a second lens element E2, a third lens element E3, a fourth lens element E4, an aperture S2, a fifth lens element E5, a filter E6, and an image surface IMG. The photographic lens system comprises five lens elements (E1, E2, E3, E4, and E5), with no additional lens element arranged between any five adjacent lens elements.

[0187] The first lens element E1 with positive refractive power has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The first lens element E1 is made of plastic material and both the object-side and image-side surfaces are aspherical.

[0188] The second lens element E2, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is also convex in a paraxial region. The second lens element E2 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object side of the second lens element E2 has an inflection point.

[0189] The third lens element E3, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is convex in a paraxial region. The third lens element E3 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the third lens element E3 has an inflection point. The image-side surface of the third lens element E3 has an inflection point. The image-side surface of the third lens element E3 has a critical point in an off-axis region.

[0190] The fourth lens element E4, with negative refractive power, has an object-side surface that is concave in a paraxial region and an image-side surface that is also concave in a paraxial region. The fourth lens element E4 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fourth lens element E4 has three inflection points. The image-side surface of the fourth lens element E4 has two inflection points. The object-side surface of the fourth lens element E4 has two critical points in an off-axis region. The image-side surface of the fourth lens element E4 has one critical point in an off-axis region.

[0191] The fifth lens element E5, with positive refractive power, has an object-side surface that is convex in a paraxial region and an image-side surface that is concave in a paraxial region. The fifth lens element E5 is made of plastic material and both its object-side and image-side surfaces are aspherical. The object-side surface of the fifth lens element E5 has four inflection points. The image-side surface of the fifth lens element E5 has one inflection point. The object-side surface of the fifth lens element E5 has one critical point in an off-axis region. The image-side surface of the fifth lens element E5 has one critical point in an off-axis region.

[0192] The E6 filter is made of glass and is located between the fifth lens element E5 and the image surface IMG. It does not affect the focal length of the photographic lens system. The IS image sensor is located on or near the image surface IMG of the photographic lens system.

[0193] The average central thickness from the first lens element E1 to the fifth lens element E5 in the photographic lens system is 0.43 mm.

[0194] The detailed optical data of the 9th embodiment are listed in Table 9A and the aspherical surface data in Table 9B below. TABLE 9A 9. Design f = 2.61 mm, Fno = 2.58, HFOV = 48.2 degrees Surface # radius of curvature thickness material index Abbe # Focal length 0 object infinity infinity 1 Aperture stop Plano 0,030 2 Lens 1 -100,0000 (ASP) 0,280 plastic 1,545 56,1 36.60 3 -16,6439 (ASP) 0,009 4 Aperture Plano 0,021 5 Lens 2 2,1995 (ASP) 0,529 plastic 1,544 56,0 2.76 6 -4,3283 (ASP) 0,404 7 Lens 3 -0,8490 (ASP) 0,257 plastic 1,614 25,6 -11.87 8 -1,0717 (ASP) 0,261 9 Lens 4 -5,2841 (ASP) 0,333 plastic 1,614 25,6 -6.69 10 18,8679 (ASP) 0,063 11 Aperture Plano -0,034 12 Lens 5 1,0051 (ASP) 0,744 plastic 1,544 56,0 4.10 13 1,3533 (ASP) 0,607 14 filter Plano 0,210 Glass 1,517 64,2 - 15 Plano 0,292 16 Picture Plano - Note: Reference wavelength is 587.6 nm (d-line). An effective radius of aperture S1 (surface 4) is 0.614 mm. An effective radius of aperture S2 (surface 11) is 1.792 mm. TABLE 9B Aspheric coefficients Surface # 2 3 5 6 k = 4,95000E+01 2,98935E+00 0,00000E+00 0,00000E+00 A4 = -1,430088097E-01 -1,073755825E+00 -6,135984935E-01 -2,531824347E-01 A6 = -6,113017479E+00 4,806397482E+00 -6,202790127E+00 2,690148981E+00 A8 = 1,632092877E+02 -7,459919330E+00 2,848212406E+02 -5,489149259E+01 A10 = -2,601498708E+03 -3,195577749E+02 -5,311872707E+03 5,959655694E+02 A12 = 2,540065640E+04 4,594167903E+03 6,133717094E+04 -4,237495715E+03 A14 = -1,432803264E+05 -2,955802817E+04 -4,760932840E+05 2,031924410E+04 A16 = 3,015525184E+05 7,482179313E+04 2,564999723E+06 -6,677191163E+04 A18 = 1,650724913E+06 2,229741837E+05 -9,707687857E+06 1,504341218E+05 A20 = -1,512624505E+07 -2,449574869E+06 2,571401043E+07 -2,279967569E+05 A22 = 5,241331955E+07 8,833990527E+06 -4,664707198E+07 2,217230236E+05 A24 = -9,045996100E+07 -1,695587182E+07 5,516697263E+07 -1,247377235E+05 A26 = 6,424699127E+07 1,727233607E+07 -3,827746035E+07 3,081639806E+04 A28 = - -7,346578572E+06 1,180469737E+07 - Surface # 7 8 9 10 k = -2,89963E+00 0,00000E+00 -1,34396E+00 0,00000E+00 A4 = -5,099228845E-01 4,681486630E-01 4,547031641E-01 7,898429832E-01 A6 = -5,211747682E+00 -8,869255093E+00 2,303006510E+00 -2,800582002E+00 A8 = 1,069435196E+02 1,232765277E+02 -1,799220998E+01 7,390850911E+00 A10 = -1,077756145E+03 -9,804485793E+02 6,040493741E+01 -1,459714973E+01 A12 = 6,495747881E+03 4,952993669E+03 -1,301213945E+02 1,992969875E+01 A14 = -2,546464608E+04 -1,698137026E+04 1,961528863E+02 -1,846191183E+01 A16 = 6,765778139E+04 4,096436166E+04 -2,126480100E+02 1,165476830E+01 A18 = -1,228294765E+05 -7,042042161E+04 1,669865161E+02 -5,017906742E+00 A20 = 1,498259881E+05 8,585725372E+04 -9,462988805E+01 1,451104759E+00 A22 = -1,172248216E+05 -7,254198328E+04 3,814056962E+01 -2,698335051E-01 A24 = 5,307713211E+04 4,037724684E+04 -1,061165684E+01 2,916494592E-02 A26 = -1,056353790E+04 -1,330707075E+04 1,926252154E+00 -1,392860160E-03 A28 = - 1,965025568E+03 -2,037461269E-01 - A30 = - - 9,420445409E-03 - Surface # 12 13 k = -1,00000E+00 -7,00185E-01 A4 = 1,720738692E-01 1,452687272E-01 A6 = -2,410500228E+00 -1,091858595E+00 A8 = 6,321754995E+00 1,987529252E+00 A10 = -9,511131008E+00 -2,158461011E+00 A12 = 8,879496737E+00 1,531328849E+00 A14 = -5,211909356E+00 -7,363179082E-01 A16 = 1,866728200E+00 2,441419643E-01 A18 = -3,518617095E-01 -5,588812291E-02 A20 = 5,001322409E-03 8,677445294E-03 A22 = 1,303963682E-02 -8,726001310E-04 A24 = -2,827175426E-03 5,127544099E-05 A26 = 2,516229891E-04 -1,336883888E-06 A28 = -8,263205303E-06 - A30 = 1,886145517E-08 -

[0195] In the 9th embodiment, the equation for the aspherical surface profiles of the aforementioned lens elements is the same as the equation for the 1st embodiment. The definitions of these parameters, listed in Table 9C below, are also the same as those given for the 1st embodiment, with corresponding values ​​for the 9th embodiment; therefore, no further explanation is given in this regard.

[0196] Furthermore, these parameters from Table 9A and Table 9B can be calculated as the following values ​​and must meet the following conditions: TABLE 9C Values ​​of the optical and physical parameters / definitions f [mm] 2,61 f / R5 -3,08 Fno 2,58 f / R6 -2,44 HFOV [Grad] 48,2 f / f5 0,64 FOV [Grad] 96,4 f1 / f2 13,26 V3+V4 51,2 f5 / f4 -0,61 V4-V3 0,0 |f1 / f3| 3,08 V4 / V5 0,46 |f2 / f3| 0,23 V5-V4 30,4 |f4 / f3| 0,56 V1+V2 112,1 |f5 / f3| 0,35 V2-V3 30,4 |f4 / f|+|f5 / f| 4,13 CT1 / [(CT2+CT3+CT4) / 3] 0,75 f / f2345 0,93 ΣCT / ΣAT 2,96 f23 / f 1,45 R5 / Dr5I -0,31 TL / lmgH 1,32 R6 / Dr6I -0,43 TL / f 1,52 10. Design

[0197] Fig. Figure 19 is a perspective view of an image acquisition unit according to the 10th embodiment of the present disclosure. In this embodiment, an image acquisition unit 100 is a camera module comprising a lens unit 101, a drive device 102, an image sensor 103, and an image stabilizer 104. The lens unit 101 comprises the photographic lens system disclosed in the 1st embodiment, a tube, and a holder (whose reference numerals have been omitted) for holding the photographic lens system. However, the lens unit 101 can alternatively be provided with the photographic lens system disclosed in other embodiments of the present disclosure, and the present disclosure is not limited thereto.The imaging light is focused in the lens unit 101 of the image acquisition unit 100 to generate an image with the drive device 102, which is used for image focusing on the image sensor 103, and the generated image is then digitally transmitted to other electronic components for further processing.

[0198] The drive unit 102 can have an autofocus function and can use various drive configurations, such as voice coil motors (VCMs), microelectromechanical systems (MEMS), piezoelectric systems, and shape memory alloys. The drive unit 102 is advantageous for achieving a better image position for the lens unit 101, enabling the lens unit 101 to capture a clear image of the object at different object distances. The image sensor 103 (e.g., CMOS or CCD), which can be characterized by high light sensitivity and low noise, is positioned on the image surface of the photographic lens system to achieve higher image quality.

[0199] The image stabilizer 104, for example an accelerometer, a gyroscope, and a Hall-effect sensor, is designed to work in conjunction with the drive unit 102 to provide optical image stabilization (OIS). The drive unit 102, working in conjunction with the image stabilizer 104, is advantageous for compensating for panning and tilting movements of the lens unit 101, thereby reducing motion blur during exposure. In some cases, compensation can be achieved through electronic image stabilization (EIS) using image processing software, thus improving image quality in dynamic or low-light scenarios. 11. Design

[0200] Fig. Figure 20 is a schematic view of an electronic device according to the 11th embodiment of the present disclosure, and Fig. Figure 21 is another schematic view of the electronic device in Fig. 20.

[0201] In this embodiment, an electronic device 200 is a smartphone comprising the image acquisition unit 100, an image acquisition unit 100a, an image acquisition unit 100b, an image acquisition unit 100c, and a display module 201 disclosed in the 10th embodiment. As in Fig. As shown in Figure 20, 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 each of the image acquisition units 100, 100a, and 100b has a single focal point. As shown in Fig. As shown in Figure 21, the image acquisition unit 100c and the display module 201 are arranged on the opposite side of the electronic device 200, so that the image acquisition unit 100c can serve as the front camera of the electronic device 200 for taking selfies, although the present disclosure is not limited to this use. Furthermore, each of the image acquisition units 100a, 100b, and 100c can comprise the photographic lens system of the present disclosure and have a similar configuration to the image acquisition unit 100. Specifically, each of the image acquisition units 100a, 100b, and 100c can comprise a lens unit, a drive device, an image sensor, and an image stabilizer. In addition, each lens unit of the image acquisition units 100a, 100b, and 100c can comprise the photographic lens system of the present disclosure, a tube, and a holder for holding the photographic lens system.

[0202] Image capture unit 100 is a wide-angle image capture unit, image capture unit 100a is a telephoto image capture unit, image capture unit 100b is an ultra-wide-angle image capture unit, and image capture unit 100c is a wide-angle image capture unit. In this embodiment, image capture units 100, 100a, and 100b have different fields of view, allowing the electronic device to have 200 different magnification ratios to meet the requirements of the optical zoom function. Furthermore, image capture unit 100c, as shown in Fig. As shown in Figure 21, the image acquisition unit 100c has a non-circular opening, and the tube or lens elements in the image acquisition unit 100c may have clipped edges at their outermost positions to conform to the shape of the non-circular opening. Therefore, it is advantageous to reduce the size of the image acquisition unit 100c, thereby increasing the area ratio of the display module 201 to that of the electronic device 200 and reducing the thickness of the electronic device 200, thus miniaturizing the module. 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. 12. Design

[0203] Fig. Figure 22 is a perspective view of an electronic device according to the 12th embodiment of the present disclosure, Fig. Figure 23 is another perspective view of the electronic device in Fig. 22 and Fig. 24 is a block diagram of the electronic device in Fig. 22.

[0204] In this embodiment, an electronic device 300 is a smartphone comprising the image acquisition unit 100 according to the 10th embodiment, an image acquisition unit 100d, an image acquisition unit 100e, an image acquisition unit 100f, an image acquisition unit 100g, a flash module 301, a focusing aid module 302, an image signal processor 303, a display module 304, and an image software processor 305. The image acquisition unit 100 and the image acquisition unit 100d are arranged on the same side of the electronic device 300. The focusing aid module 302 can be a laser distance meter or a ToF (Time of Flight) module, but the present disclosure is not limited to this.The image acquisition unit 100e, the image acquisition unit 100f, the image acquisition unit 100g, and the display module 304 are arranged on the opposite side of the electronic device 300, and the display module 304 can serve as a user interface, so that the image acquisition units 100e, 100f, and 100g can serve as front cameras of the electronic device 300 for taking selfies, but the present disclosure is not limited to this. Furthermore, each of the image acquisition units 100d, 100e, 100f, and 100g can include the photographic lens system of the present disclosure and have a similar configuration to the image acquisition unit 100. Specifically, each of the image acquisition units 100d, 100e, 100f, and 100g can include a lens unit, a drive device, an image sensor, and an image stabilizer.Furthermore, each lens unit of the image acquisition units 100d, 100e, 100f and 100g can comprise the photographic lens system of the present disclosure, a tube and a holder for holding the photographic lens system.

[0205] Image acquisition unit 100 is a wide-angle image acquisition unit, image acquisition unit 100d is an ultra-wide-angle image acquisition unit, image acquisition unit 100e is a wide-angle image acquisition unit, image acquisition unit 100f is an ultra-wide-angle image acquisition unit, and image acquisition unit 100g is a time-of-flight (ToF) image acquisition unit. In this embodiment, image acquisition units 100 and 100d have different fields of view, so that the electronic device 300 can have different magnification ratios to meet the requirements of the optical zoom function. In addition, image acquisition unit 100g can acquire depth information of the imaged object. In this embodiment, the electronic device 300 comprises multiple image acquisition units 100, 100d, 100e, 100f, and 100g, but the present disclosure is not limited to the number and arrangement of the image acquisition units.

[0206] When a user takes pictures of an object 306, the light rays are focused in the image acquisition unit 100 or the image acquisition unit 100d to produce images, and the flash module 301 is activated for light support. The focus assist module 302 detects the object distance of the imaged object 306 to achieve fast autofocus. The image signal processor 303 is designed to optimize the captured image to improve image quality. The light emitted by the focus assist module 302 can be either conventional infrared light or laser light. Additionally, the light rays can be focused in the image acquisition unit 100e, 100f, or 100g to produce images. The display module 304 can include a touchscreen, and the user can interact with the display module 304 and the multi-functional image software processor 305 to capture images and perform image processing.Alternatively, the user can take pictures using a physical button. The image processed by the 305 image software processor can be displayed on the 304 display module. 13. Design

[0207] Fig. Figure 25 is a perspective view of an electronic device according to the 13th embodiment of the present disclosure.

[0208] In this embodiment, an electronic device 400 is a smartphone comprising the image acquisition unit 100, an image acquisition unit 100h, an image acquisition unit 100i, a flash module 401, a focusing aid module, an image signal processor, a display module, and an image software processor (not shown) disclosed in the 10th embodiment. The image acquisition units 100, 100h, and 100i are arranged on the same side of the electronic device 400, while the display module is arranged on the opposite side of the electronic device 400. Furthermore, each of the image acquisition units 100h and 100i may include the photographic lens system of the present disclosure and have a similar configuration to the image acquisition unit 100, the details of which are not repeated here.

[0209] The image acquisition unit 100 is a wide-angle image acquisition unit, the image acquisition unit 100h is a telephoto image acquisition unit, and the image acquisition unit 100i is an ultra-wide-angle image acquisition unit. In this embodiment, the image acquisition units 100, 100h, and 100i have different fields of view, so that the electronic device 400 can have different magnification ratios to meet the optical zoom requirement. Furthermore, the image acquisition unit 100h is a telephoto image acquisition unit configured with a beam deflection element, which means that the overall path length of the image acquisition unit 100h is not limited by the thickness of the electronic device 400. Moreover, the light deflection configuration of the image acquisition unit 100h can, for example, be one of the configurations described in [reference missing]. Fig. 28 to Fig. The 30 configurations shown are similar, for which reference is made to the preceding descriptions. Fig. 28 to Fig. Reference can be made to Section 30, and the details relating thereto are not repeated. In this embodiment, the electronic device 400 comprises several image acquisition units 100, 100h, and 100i, but the present disclosure is not limited to the number and arrangement of the image acquisition units. When a user takes pictures of an object, the light beams are focused in the image acquisition unit 100, 100h, or 100i to produce images, and the flash module 401 is activated to assist the lighting. Furthermore, the subsequent processes are carried out in a similar manner to those in the embodiments mentioned above, and the details relating thereto are not repeated. 14. Design

[0210] Fig. Figure 26 is a perspective view of an electronic device according to the 14th embodiment of the present disclosure.

[0211] In this embodiment, an electronic device 500 is a smartphone comprising the image acquisition unit 100, an image acquisition unit 100j, an image acquisition unit 100k, an image acquisition unit 100m, an image acquisition unit 100n, an image acquisition unit 100p, an image acquisition unit 100q, an image acquisition unit 100r, an image acquisition unit 100s, a flash module 501, a focusing aid module, an image signal processor, a display module and an image software processor (not shown) disclosed in the 10th embodiment. The image acquisition units 100, 100j, 100k, 100m, 100n, 100p, 100q, 100r and 100s are arranged on the same side of the electronic device 500, while the display module is arranged on the opposite side of the electronic device 500.Furthermore, each of the image acquisition units 100j, 100k, 100m, 100n, 100p, 100q, 100r and 100s can comprise the photographic lens system of the present disclosure and have a similar configuration to the image acquisition unit 100, without the details relating thereto being specified again.

[0212] The image acquisition unit 100 is a wide-angle image acquisition unit, the image acquisition unit 100j is a telephoto image acquisition unit, the image acquisition unit 100k is a telephoto image acquisition unit, the image acquisition unit 100m is a wide-angle image acquisition unit, the image acquisition unit 100n is an ultra-wide-angle image acquisition unit, the image acquisition unit 100p is an ultra-wide-angle image acquisition unit, the image acquisition unit 100q is a telephoto image acquisition unit, the image acquisition unit 100r is a telephoto image acquisition unit, and the image acquisition unit 100s is a ToF image acquisition unit. In this embodiment, the image acquisition units 100, 100j, 100k, 100m, 100n, 100p, 100q and 100r have different fields of view, so that the electronic device can have 500 different magnification ratios to meet the requirement of the optical zoom function.Furthermore, both the 100j and 100k image acquisition units are telephoto image acquisition units configured with a beam deflection element. Moreover, the light deflection configuration of the 100j and 100k image acquisition units can, for example, be one of the features described in [reference missing]. Fig. 28 to Fig. The 30 configurations shown may be similar, for which reference is made to the descriptions above. Fig. 28 to Fig.Reference can be made to Section 30, and the relevant details are not stated again. Furthermore, the image acquisition unit 100s can acquire depth information of the imaged object. In this embodiment, the electronic device 500 comprises multiple image acquisition units 100, 100j, 100k, 100m, 100n, 100p, 100q, 100r, and 100s, but the present disclosure is not limited to the number and arrangement of the image acquisition units. When a user takes pictures of an object, the light rays are focused in the image acquisition unit 100, 100j, 100k, 100m, 100n, 100p, 100q, 100r, or 100s to produce images, and the flash module 501 is activated to assist the lighting. Furthermore, the subsequent processes are carried out in a similar manner to those in the embodiments mentioned above, and the details thereof are not specified again.

[0213] The smartphones in the embodiments serve only as examples to illustrate the image acquisition unit installed in an electronic device according to the present disclosure, and the present disclosure is not limited thereto. The image acquisition unit can optionally be applied to optical systems with movable focus. Furthermore, the photographic lens system of the image acquisition unit is characterized by good aberration correction and high image quality and can be used for 3D image acquisition applications (three-dimensional image acquisition applications) in products such as digital cameras, mobile devices, digital tablets, notebooks, smart TVs, network surveillance devices, dashboard cameras, vehicle reversing cameras, multi-camera devices, image recognition systems, motion sensor input devices, portable devices, and other electronic imaging devices.

[0214] The foregoing description has been provided for illustrative purposes with reference to specific embodiments. It should be noted that TABLES 1A-9C show different data for the various embodiments; however, the data for the different embodiments were obtained experimentally. The embodiments were selected and described to best illustrate the principles of the disclosure and their practical applications, so that other skilled persons may make the best possible use of the disclosure and of the various embodiments with different modifications suitable for their respective intended uses. The embodiments shown above and the accompanying drawings are exemplary and are not intended to be exhaustive, nor are they intended to limit the scope of this disclosure to the forms exactly disclosed. In view of the teachings above, many modifications and variations are possible.

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