Imaging lens, image acquisition unit and electronic device

Abstract

Imaging lens (1, 2, 3, 4) comprising the following: a plurality of lens elements (12, 22, 32, 42) arranged along an optical axis (OA), wherein the plurality of lens elements (12, 22, 32, 42) includes a first lens element (121, 221, 321, 421) which is one of the plurality of lens elements (12, 22, 32, 42) that is closest to an object side of the imaging objective (1, 2, 3, 4); a lens tube (14, 24, 34, 44) comprising: a tube section (142, 242, 342, 442) surrounding the optical axis (OA), wherein the plurality of lens elements (12, 22, 32, 42) are arranged in the tube section (142, 242, 342, 442); and an aperture section (144, 244, 344, 444) extending along a direction from the tube section (142, 242, 342, 442) to the optical axis (OA), wherein the aperture section (144, 244, 344, 444) has a tube aperture (144a, 244a, 344a, 444a) and a first step surface (144b, 244b, 344b, 444b) and the tube aperture (144a, 244a, 344a, 444a) is arranged on an object side of the first lens element (121, 221, 321, 421); a first aperture element (16, 26, 36, 46) arranged between the first lens element (121, 221, 321, 421) and the aperture section (144, 244, 344, 444) to space the first lens element (121, 221, 321, 421) apart from the aperture section (144, 244, 344, 444), wherein the first aperture element (16, 26, 36, 46) and the first step surface (144b, 244b, 344b, 444b) form a gap (GP) between them, and the first aperture element (16, 26, 36, 46) has a first light-transmitting aperture (166a, 266a, 366a, 466a) which is arranged accordingly is located at the tube opening (144a, 244a, 344a, 444a); and a second opening element (18, 28, 38, 48) arranged in the gap (GP), wherein the second opening element (18, 28, 38, 48) has a second light-transmitting opening (188a, 288a, 388a, 488a) arranged opposite the first light-transmitting opening (166a, 266a, 366a, 466a).

Description

BACKGROUND Subject area

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

[0002] With technological advancements, high image quality has become an indispensable feature of optical systems. Furthermore, electronic devices equipped with optical systems are increasingly multifunctional for various applications, which has raised the bar for the functionality of these systems.

[0003] Conventional optical lenses, however, struggle to meet the high optical quality requirements of electronic devices, which have undergone numerous developments in recent years, particularly regarding the demanding glare-free imaging performance required by current technological trends. Therefore, the question of how to improve the mechanism within an optical lens to meet the stringent requirements of high-end electronic devices is currently a key topic in this field. SUMMARY

[0004] According to one aspect of the present disclosure, an imaging objective comprises a plurality of lens elements, an objective tube, a first aperture element, and a second aperture element. The plurality of lens elements are arranged along an optical axis. The plurality of lens elements includes a first lens element, which is one of the plurality of lens elements located closest to an object side of the imaging objective. The objective tube comprises a tube section and an aperture section. The tube section surrounds the optical axis. The plurality of lens elements are arranged within the tube section. The aperture section extends along a direction from the tube section to the optical axis. The aperture section has a tube aperture and a first step surface. The tube aperture is located on an object side of the first lens element.The first aperture element is positioned between the first lens element and the aperture section to separate the first lens element from the aperture section. The first aperture element and the first step surface form a gap between them. The first aperture element has a first transparent aperture aligned with the tube aperture. The second aperture element is positioned within this gap. The second aperture element has a second transparent aperture aligned opposite the first transparent aperture.

[0005] According to another aspect of the present disclosure, an imaging lens comprises a plurality of lens elements, a lens tube, a first aperture element, and a second aperture element. The plurality of lens elements is arranged along an optical axis. The plurality of lens elements includes a first lens element. The lens tube comprises a tube section and an aperture section. The tube section surrounds the optical axis. The plurality of lens elements are arranged within the tube section. The aperture section extends in a direction from the tube section to the optical axis. The aperture section has a tube aperture and a first step surface. The first lens element borders the first aperture element on one side facing away from the aperture section. The first aperture element and the first step surface form a gap between them.The first opening element has a first light-transmitting opening, which is positioned corresponding to the tube opening. The second opening element is positioned within the slit. The second opening element has a second light-transmitting opening, which is positioned opposite the first light-transmitting opening.

[0006] According to another aspect of the present disclosure, an imaging lens comprises a plurality of lens elements, a lens tube, a first aperture element, and a second aperture element. The plurality of lens elements is arranged along an optical axis. The plurality of lens elements includes a first lens element. The lens tube comprises a tube section and a tube aperture element. The tube section surrounds the optical axis. The plurality of lens elements is arranged within the tube section. The tube aperture element is attached to the tube section. The tube aperture element has an aperture section extending along a direction relative to the optical axis. The aperture section has a tube aperture and a first step surface. The first lens element is adjacent to the aperture section on one side of the first aperture element, facing away from the aperture section.The first opening element and the first step surface form a gap between them. The first opening element has a first translucent opening, which is positioned corresponding to the tube opening. The second opening element is positioned within this gap. The second opening element has a second translucent opening, which is positioned opposite the first translucent opening.

[0007] According to another aspect of the present disclosure, an image acquisition unit comprises one of the aforementioned imaging lenses.

[0008] According to another aspect of the present disclosure, an electronic device comprises the aforementioned image capture unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] 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 perspective view of an imaging lens according to the first embodiment of the present disclosure; Fig. Figure 2 is an exploded view of the imaging lens in Fig. 1; Fig. Figure 3 is a perspective view of the imaging lens in Fig. 1, which was cut; Fig. Figure 4 is a cross-sectional view of the imaging lens in Fig. 1; Fig. Figure 5 is an enlarged view of the AA section of the imaging lens in Fig. 4; Fig. Figure 6 is an enlarged view of the BB section of the imaging lens in Fig. 5; Fig. Figure 7 is another schematic view of the imaging lens in Fig. 5; Fig. Figure 8 is also another schematic view of the imaging lens in Fig. 5; Fig. Figure 9 is a perspective view of an imaging lens according to the second embodiment of the present disclosure; Fig. Figure 10 is an exploded view of the imaging lens in Fig. 9; Fig. Figure 11 is a perspective view of the imaging lens in Fig. 9, which was cut; Fig. Figure 12 is a cross-sectional view of the imaging lens in Fig. 9; Fig. Figure 13 is an enlarged view of the CC section of the imaging lens in Fig. 12; Fig. Figure 14 is an enlarged view of the DD section of the imaging lens in Fig. 13; Fig. Figure 15 is a perspective view of an imaging lens according to the 3rd embodiment of the present disclosure; Fig. Figure 16 is an exploded view of the imaging lens in Fig. 15; Fig. Figure 17 is a perspective view of the imaging lens in Fig. 15, which was cut; Fig. Figure 18 is a cross-sectional view of the imaging lens in Fig. 15; Fig. Figure 19 is an enlarged view of the EE section of the imaging lens in Fig. 18; Fig. Figure 20 is an enlarged view of the FF section of the imaging lens in Fig. 19; Fig. Figure 21 is a perspective view of an imaging lens according to the 4th embodiment of the present disclosure; Fig. Figure 22 is an exploded view of the imaging lens in Fig. 21; Fig. Figure 23 is a perspective view of the imaging lens in Fig. 21, which was cut; Fig. Figure 24 is a cross-sectional view of the imaging lens in Fig. 21; Fig. Figure 25 is an enlarged view of the GG section of the imaging lens in Fig. 24; Fig. Figure 26 is an enlarged view of the HH section of the imaging lens in Fig. 25; Fig. Figure 27 is a perspective view of an electronic device according to the 5th embodiment of the present disclosure; Fig. Figure 28 is a perspective view of an electronic device according to the 6th embodiment of the present disclosure; Fig. Figure 29 is another perspective view of the electronic device in Fig. 28; Fig. Figure 30 is a representation of an image captured by an ultra-wide-angle image capture unit; Fig. 31 is a representation of an image captured by a high-pixel image capture unit; Fig. Figure 32 is a representation of an image taken by a telephoto image acquisition unit; Fig. Figure 33 is a perspective view of an electronic device according to the 7th embodiment of the present disclosure; Fig. Figure 34 is a perspective view of an electronic device according to the 8th embodiment of the present disclosure; Fig. Figure 35 is a side view of the electronic device in Fig. 34; and Fig. 36 is a top view of the electronic device in Fig. 34. DETAILED DESCRIPTION

[0010] The following detailed description provides numerous specific details to facilitate a comprehensive understanding of the disclosed embodiments. However, it is evident that one or more embodiments can also be realized without these specific details. In other cases, known structures and devices are represented schematically to simplify the drawing.

[0011] The present disclosure relates to an image acquisition unit comprising an imaging lens and an image sensor assembly. The imaging lens is arranged on an object face of the image sensor assembly. The image sensor assembly comprises an image sensor arranged on an image surface of the imaging lens. Furthermore, the image sensor assembly may include other components such as a filter, although the present disclosure is not limited to such components.

[0012] The imaging lens comprises a multitude of lens elements, a lens tube, a first aperture element, and a second aperture element.

[0013] The lens elements are arranged along an optical axis. The lens elements comprise a first lens element and at least one further lens element. The first lens element can be one of the lens elements that is closest to an object side of the imaging objective. It can also be considered that the first lens element can be arranged closer to the object side of the imaging objective than the at least one further lens element.

[0014] The objective tube can include a tube opening element. In particular, the objective tube can include a tube section and the tube opening element attached to the tube section, and the tube opening element can include an opening section.

[0015] The tube section surrounds the optical axis, and the lens elements are arranged in the tube section.

[0016] The aperture section extends along a direction towards the optical axis. More precisely, the aperture section can extend along a direction from the tube section towards the optical axis. The aperture section can include a tube aperture, a first step surface, a first connecting surface, and a second step surface.

[0017] The tube opening is located on one object side of the first lens element.

[0018] The first step surface can be closer to the optical axis than the second step surface. The first step surface can be closer to the tube opening than the second step surface.

[0019] The first connecting surface connects the first step surface with the second step surface.

[0020] The second step surface can overlap at least partially with the first lens element in a direction parallel to the optical axis.

[0021] The first aperture element is positioned between the first lens element and the aperture section to distance the first lens element from the aperture section. The first aperture element has a side facing away from the aperture section, against which the first lens element rests, thus maintaining the distance between the first lens element and the tube aperture. The first aperture element and the first step surface form a gap between them. The first aperture element may have a first light-transmitting aperture, a third step surface, a second connecting surface, and a fourth step surface.

[0022] The first light-transmitting opening is positioned according to the tube opening.

[0023] The first opening element can be in physical contact with the second step surface of the opening section. More precisely, the third step surface of the first opening element is in physical contact with the second step surface of the opening section.

[0024] The second connecting surface extends along a direction from one side of the third step surface, close to the optical axis, to the first step surface. The second connecting surface is positioned at a distance from the first connecting surface.

[0025] The fourth step surface extends along a direction from one side of the second connecting surface, close to the first step surface, towards the optical axis. The fourth step surface and the first step surface form the aforementioned gap between them.

[0026] The second opening element can be a light-blocking film. The second opening element is positioned within the gap. The second opening element can be in contact with the opening section and the first opening element via the first and second connecting surfaces, respectively. The second opening element has a second light-transmitting opening, positioned opposite the first light-transmitting opening.

[0027] The arrangement of the first aperture element is advantageous in order to space the first lens element away from the tube aperture, while the second aperture element is held in the gap, thereby reducing the tolerance between the first aperture and the lens elements to improve the optical image quality of the imaging lens.

[0028] Furthermore, the coordinated arrangement between the tube opening, the first light-transmitting aperture and the second light-transmitting aperture is advantageous for improving light with a relatively large angle of incidence, thereby preventing glare and improving the optical image quality of the imaging lens.

[0029] In some embodiments of the present disclosure, it is advantageous to arrange the aperture section on the object side of the first lens element in order to reduce the scattered light entering the imaging objective, thereby further ensuring the optical image quality.

[0030] In some other embodiments of the present disclosure, the design of the second step surface is advantageous in order to improve the alignment between the light-transmitting aperture and the first lens element, and thereby to maintain the optical image quality.

[0031] In some other embodiments of the present disclosure, the coordinated arrangement between the first step surface, the second step surface, the third step surface, the first connecting surface and the second connecting surface is advantageous for aligning the second light-transmitting aperture and the tube aperture, thereby ensuring optical image quality.

[0032] In some other embodiments of the present disclosure, the third step surface, the second connecting surface and the fourth step surface can form a step structure so that the second opening element can be easily held in the gap, thereby ensuring optical image quality.

[0033] The aperture section may further have a first conical surface which is inclined away from the optical axis in a direction from the tube aperture to the second aperture element.

[0034] The first aperture element may further have a second conical surface which is inclined away from the optical axis in a direction from the first light-transmitting aperture to the second aperture element.

[0035] At least one of the first conical surfaces and the second conical surface can include an antireflection structure surrounding the optical axis. The antireflection structure comprises a multitude of protrusions. The protrusions can be arranged sequentially along a direction surrounding the optical axis. Alternatively, the protrusions can be ring-shaped around the optical axis and arranged sequentially along a direction away from the optical axis. The design of the antireflection structure is advantageous for reducing glare caused by the reflection of non-imaging light from the first or second conical surface, thereby ensuring optical image quality.

[0036] The minimum thickness of the aperture section on the first step surface in a direction parallel to the optical axis can be less than the minimum thickness of the aperture section on the second step surface in a direction parallel to the optical axis. This is advantageous to prevent deformation during assembly and thus maintain optical image quality.

[0037] The shortest distance between the first lens element and the first transparent aperture can be less than the shortest distance between the second aperture element and the first transparent aperture. This is advantageous to reduce the risk of glare from light passing through the edge of the first lens element and thus ensure optical image quality.

[0038] The shortest distance between the first lens element and the first transparent aperture can be smaller than the shortest distance between the first lens element and the second transparent aperture. Therefore, this is advantageous in order to improve the stray light blocking effect of the first aperture element and thus further ensure optical image quality.

[0039] If the minimum gap width between the first step surface and the first aperture element is G in a direction parallel to the optical axis, and the shortest distance in a direction parallel to the optical axis between the first step surface and the second step surface is D12, the following condition can be met: 0.06 ≤ G / D12 ≤ 0.5. Therefore, it is advantageous to maintain the gap distance and further reduce the assembly tolerance. Additionally, the following condition can also be met: 0.08 ≤ G / D12 ≤ 0.45. Furthermore, the following condition can also be met: 0.1 ≤ G / D12 ≤ 0.4.

[0040] If the second aperture element is the light-blocking film, the following condition can be met if the minimum width of the gap between the first step surface and the first aperture element in the direction parallel to the optical axis is G, and the thickness of the light-blocking film is T: 1.03 ≤ G / T ≤ 1.97. Therefore, it is advantageous to prevent the first aperture element from compressing the light-blocking film, thus preventing deformation of the film. Furthermore, the following condition can also be met: 1.1 ≤ G / T ≤ 1.92.

[0041] The tube opening, the first transparent aperture, and the second transparent aperture each have a maximum aperture diameter. If the maximum aperture diameter of the tube opening is Dib, the maximum aperture diameter of the first transparent aperture is Di1, and the maximum aperture diameter of the second transparent aperture is Di2, the following conditions can be met: 0.85 ≤ Dib / Di2 ≤ 1.15; and 0.85 ≤ Di1 / Di2 ≤ 1.15. Therefore, this is advantageous for improving optical image quality in light with a relatively large angle of incidence and also for preventing glare. Furthermore, the following conditions can also be met: 0.8 ≤ Dib / Di2 ≤ 1.2; and 0.8 ≤ Di1 / Di2 ≤ 1.2. Furthermore, the following condition can also be met: 0.9 ≤ Dib / Di2 ≤ 1.1; and 0.9 ≤ Di1 / Di2 ≤ 1.1.

[0042] If the minimum thickness of the aperture section at the first stage surface is T1 in a direction parallel to the optical axis, and the thickness of the first aperture element is TS1 in a direction parallel to the optical axis, the following condition can be met: 0.14 ≤ T1 / TS1 ≤ 0.92. Therefore, it is advantageous to maintain the distance between the first lens element and the tube aperture to preserve optical image quality. Furthermore, the following condition can also be met: 0.2 ≤ T1 / TS1 ≤ 0.7.

[0043] According to the present disclosure, the above-mentioned features and conditions can be used in numerous combinations to achieve the desired effect.

[0044] In accordance with the above description of the present disclosure, the following specific embodiments are further provided for clarification. 1. Design

[0045] See Fig. 1 to Fig. 8, where Fig. 1 a perspective view of an imaging lens according to the 1st embodiment of the present disclosure is, Fig. 2 an exploded view of the imaging lens in Fig. 1 is, Fig. 3 a perspective view of the imaging lens in Fig. 1 is what was cut, Fig. 4 a cross-sectional view of the imaging lens in Fig. 1 is, Fig. 5 an enlarged view of the AA section of the imaging lens in Fig. 4 is, Fig. 6 an enlarged view of the BB section of the imaging lens in Fig. 5 is, Fig. 7 another schematic view of the imaging lens in Fig. 5 is and Fig. 8 further a schematic view of the imaging lens in Fig. 5 is.

[0046] An imaging lens 1 provided in this embodiment comprises a plurality of lens elements 12, a lens tube 14, a first aperture element 16 and a second aperture element 18.

[0047] The lens elements 12 are arranged sequentially along an optical axis OA. The lens elements 12 comprise a first lens element 121 and a plurality of further lens elements 122. The first lens element 121 is one of the lens elements 12 that is closest to an object side of the imaging objective 1. It can also be considered that the first lens element 121 is located closer to the object side of the imaging objective 1 than the further lens elements 122. The imaging objective 1 further comprises a spacer SP configured to space the lens elements 12 apart from one another and a holder RT configured to hold the lens elements 12.

[0048] The objective tube 14 comprises a tube section 142 and an aperture section 144.

[0049] The tube section 142 surrounds the optical axis OA, and the tube section 142 has a plurality of internal bore surfaces 1420 designed to accommodate components such as the lens elements 12, the first aperture element 16, the spacer SP and the support RT.

[0050] The aperture section 144 extends along a direction from the tube section 142 to the optical axis OA. The aperture section 144 has a tube aperture 144a, a first step surface 144b, a first connecting surface 144c and a second step surface 144d.

[0051] The tube opening 144a is located on one object side of the first lens element 121.

[0052] The first step surface 144b is located closer to the optical axis OA than the second step surface 144d. The first step surface 144b is located closer to the tube opening 144a than the second step surface 144d.

[0053] The first connecting surface 144c connects the first step surface 144b and the second step surface 144d.

[0054] The second step surface 144d overlaps at least partially with the first lens element 121 in a direction parallel to the optical axis OA.

[0055] The first aperture element 16 is arranged between the first lens element 121 and the aperture section 144 to distance the first lens element 121 from the aperture section 144. The first aperture element 16 has a side facing away from the aperture section 144, against which the first lens element 121 rests, thus maintaining the distance between the first lens element 121 and the tube aperture 144a. The first aperture element 16 and the first step surface 144b form a gap GP between them. The first aperture element 16 has a first light-transmitting aperture 166a, a third step surface 166b, a second connecting surface 166c, and a fourth step surface 166d.

[0056] The first light-transmitting opening 166a is arranged corresponding to the tube opening 144a.

[0057] The third step surface 166b of the first opening element 16 is in physical contact with the second step surface 144d of the opening section 144.

[0058] The second connecting surface 166c extends along a direction from one side of the third step surface 166b close to the optical axis OA to the first step surface 144b. The second connecting surface 166c is spaced apart from the first connecting surface 144c.

[0059] The fourth step surface 166d extends along a direction from one side of the second connecting surface 166c, close to the first step surface 144b, towards the optical axis OA. The fourth step surface 166d and the first step surface 144b form the aforementioned gap GP between them.

[0060] The second opening element 18 is a light-blocking film. The second opening element 18 is arranged in the gap GP. The second opening element 18 is in contact with the opening section 144 via both the first step surface 144b and the first connecting surface 144c. The second opening element 18 has a second light-transmitting opening 188a, which is arranged opposite the first light-transmitting opening 166a.

[0061] In this embodiment, the aperture section 144 further comprises a first conical surface 144e which is inclined along a direction from the tube aperture 144a to the second aperture element 18 away from the optical axis OA.

[0062] The first aperture element 16 further has a second conical surface 166e which is inclined along a direction from the first transparent aperture 166a to the second aperture element 18 away from the optical axis OA.

[0063] As in Fig. As shown in Figure 5, a minimum thickness T1 of the aperture section 144 at the first step surface 144b in a direction parallel to the optical axis OA is less than a minimum thickness T2 of the aperture section 144 at the second step surface 144d in a direction parallel to the optical axis OA.

[0064] As in Fig. As shown in Figure 7, the shortest distance SD1 between the first lens element 121 and the first transparent aperture 166a is less than the shortest distance SD2 between the second aperture element 18 and the first transparent aperture 166a.

[0065] As in Fig. As shown in Figure 8, the shortest distance SD1 between the first lens element 121 and the first transparent aperture 166a is less than a shortest distance SD3 between the first lens element 121 and the second transparent aperture 188a.

[0066] If a minimum width of the gap GP between the first step surface 144b and the first aperture element 16 in a direction parallel to the optical axis OA is G and a shortest distance in a direction parallel to the optical axis OA between the first step surface 144b and the second step surface 144d is D12, the following conditions are met: G = 0.03 mm; D12 = 0.12 mm; and G / D12 = 0.25.

[0067] If the minimum width of the gap GP between the first step surface 144b and the first aperture element 16 in the direction parallel to the optical axis OA is G and the thickness of the light-blocking film is T, the following conditions are met: G = 0.03 mm; T = 0.016 mm; and G / T = 1.875.

[0068] Each of the tube opening 144a, the first transparent opening 166a, and the second transparent opening 188a has a maximum opening diameter. If the maximum opening diameter of the tube opening 144a is Dib, the maximum opening diameter of the first transparent opening 166a is Di1, and the maximum opening diameter of the second transparent opening 188a is Di2, then the following conditions are met: Dib = 3.76 mm; Di1 = 3.78 mm; Di2 = 3.63 mm; Dib / Di2 = 1.036; and Di1 / Di2 = 1.041.

[0069] If the minimum thickness of the aperture section 144 at the first step surface 144b in the direction parallel to the optical axis OA is T1 and the thickness of the first aperture element 16 in a direction parallel to the optical axis OA is TS1, the following conditions are met: T1 = 0.196 mm; TS1 = 0.686 mm; and T1 / TS1 = 0.286. 2. Design

[0070] See Fig. 9 to Fig. 14, where Fig. 9 a perspective view of an imaging lens according to the 2nd embodiment of the present disclosure is, Fig. 10 an exploded view of the imaging lens in Fig. 9 is, Fig. 11 a perspective view of the imaging lens in Fig. 9 is what was cut, Fig. 12 a cross-sectional view of the imaging lens in Fig. 9 is, Fig. 13 an enlarged view of the CC section of the imaging lens in Fig. 12 is and Fig. 14 an enlarged view of the DD section of the imaging lens in Fig. 13 is.

[0071] An imaging lens 2 provided in this embodiment comprises a plurality of lens elements 22, a lens tube 24, a first aperture element 26 and a second aperture element 28.

[0072] The lens elements 22 are arranged sequentially along an optical axis OA. The lens elements 22 comprise a first lens element 221 and a plurality of further lens elements 222. The first lens element 221 is located between the further lens elements 222. The imaging lens 2 further comprises a spacer SP, which is configured to space the lens elements 22 apart, and a holder RT, which is configured to hold the lens elements 22.

[0073] The lens tube 24 comprises a tube section 242 and an aperture section 244.

[0074] The tube section 242 surrounds the optical axis OA, and the tube section 242 has a plurality of internal bore surfaces 2420 designed to accommodate components such as the lens elements 22, the first aperture element 26, the spacer SP and the bracket RT.

[0075] The aperture section 244 extends along a direction from the tube section 242 to the optical axis OA. The aperture section 244 has a tube aperture 244a, a first step surface 244b, a first connecting surface 244c and a second step surface 244d.

[0076] The tube opening 244a is located on one object side of the first lens element 221.

[0077] The first step surface 244b is located closer to the optical axis OA than the second step surface 244d. The first step surface 244b is located closer to the tube opening 244a than the second step surface 244d.

[0078] The first connecting surface 244c connects the first step surface 244b and the second step surface 244d.

[0079] The first aperture element 26 is arranged between the first lens element 221 and the aperture section 244 to distance the first lens element 221 from the aperture section 244. The first aperture element 26 has a side facing away from the aperture section 244, against which the first lens element 221 rests, thus maintaining the distance between the first lens element 221 and the tube aperture 244a. The first aperture element 26 and the first step surface 244b form a gap GP between them. The first aperture element 26 has a first light-transmitting aperture 266a, a third step surface 266b, a second connecting surface 266c, and a fourth step surface 266d.

[0080] The first light-transmitting opening 266a is arranged corresponding to the tube opening 244a.

[0081] The third step surface 266b of the first opening element 26 is in physical contact with the second step surface 244d of the opening section 244.

[0082] The second connecting surface 266c extends along a direction from one side of the third step surface 266b close to the optical axis OA to the first step surface 244b. The second connecting surface 266c is spaced apart from the first connecting surface 244c.

[0083] The fourth step surface 266d extends along a direction from one side of the second connecting surface 266c, close to the first step surface 244b, towards the optical axis OA. The fourth step surface 266d and the first step surface 244b form the aforementioned gap GP between them.

[0084] The second opening element 28 is a light-blocking film. The second opening element 28 is arranged in the gap GP. The second opening element 28 is in contact with the opening section 244 via both the first step surface 244b and the first connecting surface 244c. The second opening element 28 has a second light-transmitting opening 288a, which is arranged opposite the first light-transmitting opening 266a.

[0085] In this embodiment, the aperture section 244 further comprises a first conical surface 244e which is inclined along a direction from the tube aperture 244a to the second aperture element 28 away from the optical axis OA.

[0086] The first aperture element 26 further has a second conical surface 266e which is inclined along a direction from the first transparent aperture 266a to the second aperture element 28 away from the optical axis OA.

[0087] Both the first conical surface 244e and the second conical surface 266e include an antireflection structure AT surrounding the optical axis OA. The antireflection structure AT comprises a multitude of projections (unnumbered). The projections are ring-shaped to surround the optical axis OA and are arranged sequentially along a direction away from the optical axis OA.

[0088] As in Fig. As shown in Figure 13, a minimum thickness T1 of the aperture section 244 at the first step surface 244b in a direction parallel to the optical axis OA is less than a minimum thickness T2 of the aperture section 244 at the second step surface 244d in a direction parallel to the optical axis OA.

[0089] If a minimum width of the gap GP between the first step surface 244b and the first aperture element 26 in a direction parallel to the optical axis OA is G and a shortest distance in a direction parallel to the optical axis OA between the first step surface 244b and the second step surface 244d is D12, the following conditions are met: G = 0.03 mm; D12 = 0.23 mm; and G / D12 = 0.130.

[0090] If the minimum width of the gap GP between the first step surface 244b and the first aperture element 26 in the direction parallel to the optical axis OA is G and the thickness of the light-blocking film is T, the following conditions are met: G = 0.03 mm; T = 0.025 mm; and G / T = 1.2.

[0091] Each of the tube opening 244a, the first transparent opening 266a, and the second transparent opening 288a has a maximum opening diameter. If the maximum opening diameter of the tube opening 244a is Dib, the maximum opening diameter of the first transparent opening 266a is Di1, and the maximum opening diameter of the second transparent opening 288a is Di2, then the following conditions are met: Dib = 7.3 mm; Di1 = 7.94 mm; Di2 = 7.63 mm; Dib / Di2 = 0.957; and Di1 / Di2 = 1.041.

[0092] If the minimum thickness of the aperture section 244 at the first step surface 244b in the direction parallel to the optical axis OA is T1 and the thickness of the first aperture element 26 in a direction parallel to the optical axis OA is TS1, the following conditions are met: T1 = 0.612 mm; TS1 = 1.306 mm; and T1 / TS1 = 0.469. 3. Design

[0093] See Fig. 15 to Fig. 20, where Fig. 15 a perspective view of an imaging lens according to the 3rd embodiment of the present disclosure is, Fig. 16 an exploded view of the imaging lens in Fig. 15 is, Fig. 17 a perspective view of the imaging lens in Fig. 15 is what was cut, Fig. 18 a cross-sectional view of the imaging lens in Fig. 15 is, Fig. 19 an enlarged view of the EE section of the imaging lens in Fig. 18 is and Fig. 20 an enlarged view of the FF section of the imaging lens in Fig. 19 is.

[0094] An imaging lens 3 provided in this embodiment comprises a plurality of lens elements 32, a lens tube 34, a first aperture element 36 and a second aperture element 38.

[0095] The lens elements 32 are arranged sequentially along the optical axis OA. The lens elements 32 comprise a first lens element 321 and a plurality of remaining lens elements 322. The first lens element 321 is one of the lens elements 32 that is closest to an object side of the imaging objective 3. It can also be considered that the first lens element 321 is located closer to the object side of the imaging objective 3 than the other lens elements 322. The imaging objective 3 further comprises a spacer SP configured to space the lens elements 32 apart and a holder RT configured to hold the lens elements 32.

[0096] The objective tube 34 comprises a tube opening element 340. In particular, the objective tube 34 comprises a tube section 342 and the aforementioned tube opening element 340, which is attached to the tube section 342, and the tube opening element 340 comprises an opening section 344.

[0097] The tube section 342 surrounds the optical axis OA, and the tube section 342 has a plurality of internal bore surfaces 3420 designed to accommodate components such as the lens elements 32, the first aperture element 36, the spacer SP and the support RT.

[0098] The aperture section 344 extends along a direction towards the optical axis OA. The aperture section 344 has a tube aperture 344a, a first step surface 344b, a first connecting surface 344c and a second step surface 344d.

[0099] The tube opening 344a is located on one object side of the first lens element 321.

[0100] The first step surface 344b is located closer to the optical axis OA than the second step surface 344d. The first step surface 344b is located closer to the tube opening 344a than the second step surface 344d.

[0101] The first connecting surface 344c connects the first step surface 344b and the second step surface 344d.

[0102] The second step surface 344d overlaps at least partially with the first lens element 321 in a direction parallel to the optical axis OA.

[0103] The first aperture element 36 is arranged between the first lens element 321 and the aperture section 344 to distance the first lens element 321 from the aperture section 344. The first aperture element 36 has a side facing away from the aperture section 344, against which the first lens element 321 rests, thus maintaining the distance between the first lens element 321 and the tube aperture 344a. The first aperture element 36 and the first step surface 344b form a gap GP between them. The first aperture element 36 has a first light-transmitting aperture 366a, a third step surface 366b, a second connecting surface 366c, and a fourth step surface 366d.

[0104] The first light-transmitting opening 366a is arranged corresponding to the tube opening 344a.

[0105] The third step surface 366b of the first opening element 36 is in physical contact with the second step surface 344d of the opening section 344.

[0106] The second connecting surface 366c extends along a direction from one side of the third step surface 366b close to the optical axis OA to the first step surface 344b. The second connecting surface 366c is spaced apart from the first connecting surface 344c.

[0107] The fourth step surface 366d extends along a direction from one side of the second connecting surface 366c, close to the first step surface 344b, towards the optical axis OA. The fourth step surface 366d and the first step surface 344b form the aforementioned gap GP between them.

[0108] The second opening element 38 is a light-blocking film. The second opening element 38 is arranged in the gap GP. The second opening element 38 is in contact with the opening section 344 via both the first step surface 344b and the first connecting surface 344c. The second opening element 38 has a second light-transmitting opening 388a, which is arranged opposite the first light-transmitting opening 366a.

[0109] In this embodiment, the aperture section 344 further comprises a first conical surface 344e which is inclined along a direction from the tube aperture 344a to the second aperture element 38 away from the optical axis OA.

[0110] The first aperture element 36 further has a second conical surface 366e which is inclined along a direction from the first transparent aperture 366a to the second aperture element 38 away from the optical axis OA.

[0111] The second conical surface 366e includes an antireflection structure AT surrounding the optical axis OA. The antireflection structure AT comprises a multitude of projections (unnumbered). The projections are linear, forming an angle with the optical axis OA, and are arranged sequentially along a direction surrounding the optical axis OA.

[0112] As in Fig. As shown in Figure 19, a minimum thickness T1 of the aperture section 344 at the first step surface 344b in a direction parallel to the optical axis OA is less than a minimum thickness T2 of the aperture section 344 at the second step surface 344d in a direction parallel to the optical axis OA.

[0113] If a minimum width of the gap GP between the first step surface 344b and the first aperture element 36 in a direction parallel to the optical axis OA is G and a shortest distance in a direction parallel to the optical axis OA between the first step surface 344b and the second step surface 344d is D12, the following conditions are met: G = 0.03 mm; D12 = 0.12 mm; and G / D12 = 0.25.

[0114] If the minimum width of the gap GP between the first step surface 344b and the first aperture element 36 in the direction parallel to the optical axis OA is G and the thickness of the light-blocking film is T, the following conditions are met: G = 0.03 mm; T = 0.02 mm; and G / T = 1.5.

[0115] Each of the tube opening 344a, the first transparent opening 366a, and the second transparent opening 388a has a maximum opening diameter. If the maximum opening diameter of the tube opening 344a is Dib, the maximum opening diameter of the first transparent opening 366a is Di1, and the maximum opening diameter of the second transparent opening 388a is Di2, then the following conditions are met: Dib = 3.76 mm; Di1 = 4.05 mm; Di2 = 3.63 mm; Dib / Di2 = 1.036; and Di1 / Di2 = 1.116.

[0116] If the minimum thickness of the aperture section 344 at the first step surface 344b in the direction parallel to the optical axis OA is T1 and the thickness of the first aperture element 36 in a direction parallel to the optical axis OA is TS1, the following conditions are met: T1 = 0.196 mm; TS1 = 0.663 mm; and T1 / TS1 = 0.296. 4. Design

[0117] See Fig. 21 to Fig. 26, where Fig. 21 a perspective view of an imaging lens according to the 4th embodiment of the present disclosure is, Fig. 22 an exploded view of the imaging lens in Fig. 21 is, Fig. 23 a perspective view of the imaging lens in Fig. 21 is what was cut, Fig. 24 a cross-sectional view of the imaging lens in Fig. 21 is, Fig. 25 an enlarged view of the GG section of the imaging lens in Fig. 24 is and Fig. 26 an enlarged view of the HH section of the imaging lens in Fig. 25 is.

[0118] An imaging lens 4 provided in this embodiment comprises a plurality of lens elements 42, a lens tube 44, a first aperture element 46 and a second aperture element 48.

[0119] The lens elements 42 are arranged sequentially along an optical axis OA. The lens elements 42 comprise a first lens element 421 and a plurality of further lens elements 422. The first lens element 421 is one of the lens elements 42 that is closest to an object side of the imaging objective 4. It can also be considered that the first lens element 421 is arranged closer to the object side of the imaging objective 4 than the further lens elements 422. The imaging objective 4 further comprises a spacer SP, which is configured to space the lens elements 42 apart from one another.

[0120] The objective tube 44 comprises a tube opening element 440. In particular, the objective tube 44 comprises a tube section 442 and the aforementioned tube opening element 440, which is attached to the tube section 442 by colloid CD, and the tube opening element 440 comprises an opening section 444.

[0121] The tube section 442 surrounds the optical axis OA, and the tube section 442 has a plurality of internal bore surfaces 4420 which are designed to accommodate components such as the lens elements 42, the first aperture element 46, the second aperture element 48 and the spacer SP.

[0122] The aperture section 444 extends along a direction towards the optical axis OA. The aperture section 444 has a tube aperture 444a and a first step surface 444b.

[0123] The tube opening 444a is located on one object side of the first lens element 421.

[0124] The first step surface 444b faces an image side of the imaging lens.

[0125] The first aperture element 46 is arranged between the first lens element 421 and the aperture section 444 to distance the first lens element 421 from the aperture section 444. The first aperture element 46 has a side facing away from the aperture section 444, against which the first lens element 421 rests, and the first aperture element 46 is attached to one of the inner bore surfaces 4420, thereby maintaining the distance between the first lens element 421 and the tube aperture 444a. The first aperture element 46 and the first step surface 444b form a gap GP between them. The first aperture element 46 has a first light-transmitting aperture 466a.

[0126] The first light-transmitting opening 466a is arranged corresponding to the tube opening 444a.

[0127] The second opening element 48 is a light-blocking film. The second opening element 48 is arranged in the gap GP. The second opening element 48 is in contact with the opening section 444 via both the first step surface 444b and the first connecting surface 444c. The second opening element 48 has a second light-transmitting opening 488a, which is arranged opposite the first light-transmitting opening 466a.

[0128] In this embodiment, the aperture section 444 further comprises a first conical surface 444e which is inclined along a direction from the tube aperture 444a to the second aperture element 48 away from the optical axis OA.

[0129] The first aperture element 46 further has a second conical surface 466e which is inclined along a direction from the first transparent aperture 466a to the second aperture element 48 away from the optical axis OA.

[0130] If a minimum width of the gap GP between the first step surface 444b and the first aperture element 46 in a direction parallel to the optical axis OA G is and a thickness of the light-blocking film T is, the following conditions are met: G = 0.06 mm; T = 0.04 mm; and G / T = 1.5.

[0131] Each of the tube opening 444a, the first transparent opening 466a, and the second transparent opening 488a has a maximum opening diameter. If the maximum opening diameter of the tube opening 444a is Dib, the maximum opening diameter of the first transparent opening 466a is Di1, and the maximum opening diameter of the second transparent opening 488a is Di2, then the following conditions are met: Dib = 6.1 mm; Di1 = 6 mm; Di2 = 5.93 mm; Dib / Di2 = 1.029; and Di1 / Di2 = 1.012.

[0132] If the minimum thickness of the aperture section 444 at the first step surface 444b in a direction parallel to the optical axis OA is T1 and the thickness of the first aperture element 46 in a direction parallel to the optical axis OA is TS1, the following conditions are met: T1 = 0.285 mm; TS1 = 0.415 mm; and T1 / TS1 = 0.687. 5. Design

[0133] See Fig. 27, which shows a perspective view of an electronic device according to the 5th embodiment of the present disclosure.

[0134] An electronic device 100 provided in this embodiment can be an unmanned aerial vehicle. The electronic device 100 comprises a side image acquisition unit 100a and a front image acquisition unit 100b. The side image acquisition unit 100a and the front image acquisition unit 100b each comprise one of the imaging lenses 1-4 disclosed in embodiments 1 to 4 of the present disclosure in order to provide reliable optical quality and environmental resistance for the photography of the electronic device 100. 6. Design

[0135] See Fig. 28 and Fig. 29. Fig. Figure 28 is a perspective view of an electronic device according to the 6th embodiment of the present disclosure, and Fig. Figure 29 is another perspective view of the electronic device in Fig. 28.

[0136] In this embodiment, the electronic device 200 is a smartphone comprising a plurality of image acquisition units, a flash module 201, a focusing aid module 202, an image signal processor 203, a display module (user interface) 204 and an image software processor (not shown).

[0137] These image acquisition units comprise an ultra-wide-angle image acquisition unit 200a, a high-pixel image acquisition unit 200b, a telephoto image acquisition unit 200c, and a telephoto image acquisition unit 200d. Furthermore, the image acquisition unit 200b may, for example, comprise one of the imaging lenses 1-4 disclosed in embodiments 1 to 4 of the present disclosure and an image sensor assembly (unnumbered). The image sensor assembly comprises an image sensor IS (as described in Fig. 4), which is arranged on an image surface of the imaging lens. In addition, the image sensor assembly further comprises a filter FT (as shown in Fig. 4 shown), which is arranged between the imaging lens and the image sensor IS. At least one of the image acquisition units 200a, 200c and 200d may comprise one of the imaging lenses 1-4 disclosed in embodiments 1 to 4 of the present disclosure, but the present disclosure is not limited thereto.

[0138] The image captured by the ultra-wide-angle image acquisition unit 200a has the characteristic that multiple depicted objects are present. Fig. Figure 30 is a representation of an image captured by the ultra-wide-angle image acquisition unit 200a.

[0139] The image captured by the High Pixel Image Acquisition Unit 200b is characterized by high resolution and low distortion, and the High Pixel Image Acquisition Unit 200b can capture part of the image in Fig. Record 30. Fig. Figure 31 is a representation of an image captured by the high-pixel image acquisition unit 200b.

[0140] The image captured by the Tele Image Capture Unit 200c or the Tele Image Capture Unit 200d is characterized by high optical magnification, and the Tele Image Capture Unit 200c or the Tele Image Capture Unit 200d can capture part of the image in Fig. 31. Fig. 32 is a representation of an image taken by the Tele Image Acquisition Unit 200c or the Tele Image Acquisition Unit 200d.

[0141] When a user captures images of an object, the light rays are focused in the Ultra Wide Angle Image Capture Unit 200a, the High Pixel Image Capture Unit 200b, the Telephoto Image Capture Unit 200c, or the Telephoto Image Capture Unit 200d to create an image, and the Flash Module 201 is activated for illumination. The Focus Assist Module 202 detects the object's distance to enable fast autofocus. The Image Signal Processor 203 is designed to optimize the captured image to improve image quality and provide a zoom function. The light beam emitted by the Focus Assist Module 202 can be either conventional infrared light or laser light.The display module 204 can include a touchscreen, allowing the user to interact with it to adjust the viewing angle and switch between different image capture units. The image software processor has several functions for capturing images and performing image processing. Alternatively, the user can capture images using a physical button. The image processed by the image software processor can be displayed on the display module 204. 7. Design

[0142] See Fig. 33, which shows a perspective view of an electronic device according to the 7th embodiment of the present disclosure.

[0143] In this embodiment, the electronic device 300 is a smartphone comprising an image capture unit 300a, an image capture unit 300b, an image capture unit 300c, an image capture unit 300d, an image capture unit 300e, an image capture unit 300f, an image capture unit 300g, an image capture unit 300h, an image capture unit 300i, a flash module 301, an image signal processor, a display module and an image software processor (not shown). The image acquisition unit 300a, the image acquisition unit 300b, the image acquisition unit 300c, the image acquisition unit 300d, the image acquisition unit 300e, the image acquisition unit 300f, the image acquisition unit 300g, the image acquisition unit 300h and the image acquisition unit 300i are arranged on the same side of the electronic device 300, while the display module is arranged on the opposite side of the electronic device 300.Furthermore, the image acquisition unit 300e, for example, comprises one of the imaging lenses 1-4 disclosed in embodiments 1 to 4 of the present disclosure, but the present disclosure is not limited thereto. At least one of the image acquisition units 300a, 300b, 300c, 300d, 300f, 300g, 300h and 300i may comprise one of the imaging lenses 1-4 disclosed in embodiments 1 to 4 of the present disclosure.

[0144] The image acquisition unit 300a is a telephoto image acquisition unit, the image acquisition unit 300b is a telephoto image acquisition unit, the image acquisition unit 300c is a telephoto image acquisition unit, the image acquisition unit 300d is a telephoto image acquisition unit, the image acquisition unit 300e is a wide-angle image acquisition unit, the image acquisition unit 300f is a wide-angle image acquisition unit, the image acquisition unit 300g is an ultra-wide-angle image acquisition unit, the image acquisition unit 300h is a ToF (Time of Flight) image acquisition unit, and the image acquisition unit 300i is an ultra-wide-angle image acquisition unit.In this embodiment, the image acquisition units 300i, 300a, 300b, 300c, 300d, 300e, 300f, and 300g have different fields of view, allowing the electronic device 300 to have different magnification ratios to meet the optical zoom requirement. Furthermore, image acquisition units 300a and 300b are telephoto image acquisition units with a light deflection element configuration. Additionally, image acquisition unit 300h can determine depth information of the imaged object.In this embodiment, the electronic device 300 comprises several image acquisition units 300a, 300b, 300c, 300d, 300e, 300f, 300g, 300h, and 300i, 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 image acquisition unit 300a, 300b, 300c, 300d, 300e, 300f, 300g, 300h, or 300i to produce one or more images, and the flash module 301 is activated to provide additional light. Furthermore, the subsequent processes are carried out in a similar manner to those in the embodiments mentioned above, so the details in this regard are not repeated. 8. Design

[0145] See Fig. 34 to Fig. 36. Fig. Figure 34 is a perspective view of an electronic device according to the 8th embodiment of the present disclosure, Fig. Figure 35 is a side view of the electronic device in Fig. 34 and Fig. 36 is a top view of the electronic device in Fig. 34.

[0146] In this embodiment, the electronic device 400 is an automobile. The electronic device 400 comprises a plurality of image acquisition units 400a for motor vehicles, and the image acquisition units 400a each comprise the imaging lenses 1-4 as described in the 1st to 4th embodiments of the present disclosure. The image acquisition units 400a can, for example, serve as panoramic car cameras, dashboard cameras, and vehicle reversing cameras.

[0147] As in Fig. As shown in Figure 34, the image acquisition units 400a, for example, are arranged around the vehicle to capture peripheral images of the vehicle, which is advantageous for capturing external traffic information to achieve an autopilot function. Furthermore, the image software processor can stitch the peripheral images together to form a panoramic image, allowing the driver to check all corners around the vehicle, which is beneficial for parking and driving.

[0148] As in Fig. As shown in Figure 35, the image acquisition units 400a are, for example, arranged on the lower part of the side mirrors. The maximum field of view of the image acquisition units 400a can be between 40 and 90 degrees in order to capture images in sections on the left and right lanes.

[0149] As in Fig.As shown in Figure 36, the image acquisition units 400a can, for example, also be arranged on the lower part of the side mirrors and inside the front and rear windscreens to provide the driver with external information and also to provide more viewing angles in order to reduce blind spots and thereby improve driving safety.

[0150] The unmanned aerial vehicle, smartphones, panoramic car cameras, dashboard cameras, and vehicle reversing cameras 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 to these. The image acquisition unit can optionally be applied to optical systems with moving focus. Furthermore, the image acquisition unit is characterized by good aberration correction and high image quality and can be used for 3D image acquisition applications (three-dimensional image acquisition applications) in products such as digital cameras, mobile devices, digital tablets, smart televisions, network surveillance devices, multi-camera devices, image recognition systems, motion sensor input devices, portable devices, and other electronic imaging devices.

[0151] The foregoing description has been provided for illustrative purposes with reference to specific embodiments. It should be noted that the present disclosure shows different data for the various embodiments; however, the data for the different embodiments were obtained from experiments. 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 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 the present disclosure to the forms exactly disclosed. In view of the above teachings, many modifications and variations are possible.

Claims

[1] Imaging lens (1, 2, 3, 4) comprising the following: a plurality of lens elements (12, 22, 32, 42) arranged along an optical axis (OA), wherein the plurality of lens elements (12, 22, 32, 42) includes a first lens element (121, 221, 321, 421) which is one of the plurality of lens elements (12, 22, 32, 42) that is closest to an object side of the imaging objective (1, 2, 3, 4); a lens tube (14, 24, 34, 44) comprising: a tube section (142, 242, 342, 442) surrounding the optical axis (OA), wherein the plurality of lens elements (12, 22, 32, 42) are arranged in the tube section (142, 242, 342, 442); and an aperture section (144, 244, 344, 444) extending along a direction from the tube section (142, 242, 342, 442) to the optical axis (OA), wherein the aperture section (144, 244, 344, 444) has a tube aperture (144a, 244a, 344a, 444a) and a first step surface (144b, 244b, 344b, 444b) and the tube aperture (144a, 244a, 344a, 444a) is arranged on an object side of the first lens element (121, 221, 321, 421); a first aperture element (16, 26, 36, 46) arranged between the first lens element (121, 221, 321, 421) and the aperture section (144, 244, 344, 444) to space the first lens element (121, 221, 321, 421) apart from the aperture section (144, 244, 344, 444), wherein the first aperture element (16, 26, 36, 46) and the first step surface (144b, 244b, 344b, 444b) form a gap (GP) between them, and the first aperture element (16, 26, 36, 46) has a first light-transmitting aperture (166a, 266a, 366a, 466a) which is arranged accordingly is located at the tube opening (144a, 244a, 344a, 444a); and a second opening element (18, 28, 38, 48) arranged in the gap (GP), wherein the second opening element (18, 28, 38, 48) has a second light-transmitting opening (188a, 288a, 388a, 488a) arranged opposite the first light-transmitting opening (166a, 266a, 366a, 466a). [2] Imaging lens (1, 2, 3) according to claim 1, wherein the aperture section (144, 244, 344) further comprises a second step surface (144d, 244d, 344d) which overlaps at least partially with the first lens element (121, 221, 321) in a direction parallel to the optical axis (OA); wherein the first opening element (16, 26, 36) further comprises a third step surface (166b, 266b, 366b) which is in physical contact with the second step surface (144d, 244d, 344d) of the opening section (144, 244, 344). [3] Imaging lens (1, 2, 3) according to claim 2, wherein the second step surface (144d, 244d, 344d) is arranged further away from the optical axis (OA) than the first step surface (144b, 244b, 344b); wherein the opening section (144, 244, 344) further comprises a first connecting surface (144c, 244c, 344c) which connects the first step surface (144b, 244b, 344b) with the second step surface (144d, 244d, 344d); wherein the first aperture element (16, 26, 36) further comprises a second connecting surface (166c, 266c, 366c) extending along a direction from one side of the third step surface (166b, 266b, 366b) close to the optical axis (OA) to the first step surface (144b, 244b, 344b); wherein the first connecting surface (144c, 244c, 344c) is spaced apart from the second connecting surface (166c, 266c, 366c) and the opening section (144, 244, 344) and the first opening element (16, 26, 36) are each in contact with the second opening element (18, 28, 38) via the first connecting surface (144c, 244c, 344c) and the second connecting surface (166c, 266c, 366c). [4] Imaging lens (1, 2, 3) according to claim 3, wherein the first aperture element (16, 26, 36) further comprises a fourth step surface (166d, 266d, 366d) extending along a direction from one side of the second connecting surface (166c, 266c, 366c) close to the first step surface (144b, 244b, 344b) to the optical axis (OA), and the fourth step surface (166d, 266d, 366d) and the first step surface (144b, 244b, 344b) forming the gap (GP) between them. [5] Imaging lens (1, 2, 3) according to claim 2, wherein a minimum width of the gap (GP) between the first step surface (144b, 244b, 344b) and the first aperture element (16, 26, 36) in a direction parallel to the optical axis (OA) is G, a shortest distance in a direction parallel to the optical axis (OA) between the first step surface (144b, 244b, 344b) and the second step surface (144d, 244d, 344d) is D12 and the following condition is satisfied: 0.06≤G / D12≤0.

5. [6] Imaging lens (1, 2, 3) according to claim 2, wherein a minimum thickness of the aperture section (144, 244, 344) at the first step surface (144b, 244b, 344b) in a direction parallel to the optical axis (OA) is less than a minimum thickness of the aperture section (144, 244, 344) at the second step surface (144d, 244d, 344d) in a direction parallel to the optical axis (OA). [7] Imaging lens (1, 2, 3, 4) according to claim 1, wherein the second aperture element (18, 28, 38, 48) is a light-blocking film; wherein a minimum width of the gap (GP) between the first step surface (144b, 244b, 344b, 444b) and the first aperture element (16, 26, 36, 46) in a direction parallel to the optical axis (OA) G is a thickness of the light-blocking film T and the following condition is met: 1.03≤G / T≤1.

97. [8] Imaging lens (2) according to claim 1, wherein the aperture section (244) further comprises a first conical surface (244e) inclined away from the optical axis (OA) along a direction from the tube aperture (244a) to the second aperture element (28), the first conical surface (244e) comprising an antireflection structure (AT) surrounding the optical axis (OA), and the antireflection structure (AT) comprising a plurality of projections. [9] Imaging lens (2, 3) according to claim 1, wherein the first aperture element (26, 36) further comprises a second conical surface (266e, 366e) inclined away from the optical axis (OA) along a direction from the first light-transmitting aperture (266a, 366a) to the second aperture element (28, 38), the second conical surface (266e, 366e) comprising an antireflection structure (AT) surrounding the optical axis (OA), and the antireflection structure (AT) comprising a plurality of projections. [10] Imaging lens (1, 2, 3, 4) according to claim 1, wherein each of the tube opening (144a, 244a, 344a, 444a), the first light-transmitting opening (166a, 266a, 366a, 466a) and the second light-transmitting opening (188a, 288a, 388a, 488a) has a maximum opening diameter; where the maximum aperture diameter of the tube opening (144a, 244a, 344a, 444a) is Dib, the maximum aperture diameter of the first light-transmitting opening (166a, 266a, 366a, 466a) is Di1, the maximum aperture diameter of the second light-transmitting opening (188a, 288a, 388a, 488a) is Di2, and the following conditions are met: 0.85≤Dib / Di2≤1.15; and 0.85≤Di1 / Di2≤1.

15. [11] Imaging lens (1, 2, 3, 4) according to claim 1, wherein a minimum thickness of the aperture section (144, 244, 344, 444) at the first step surface (144b, 244b, 344b, 444b) is in a direction parallel to the optical axis (OA) T1, a thickness of the first aperture element (16, 26, 36, 46) is in a direction parallel to the optical axis (OA) TS1 and the following condition is met: 0.14≤T1 / TS1≤0.

92. [12] Imaging lens (1, 2, 3, 4) according to claim 1, wherein a shortest distance between the first lens element (121, 221, 321, 421) and the first light-transmitting aperture (166a, 266a, 366a, 466a) is less than a shortest distance between the second aperture element (18, 28, 38, 48) and the first light-transmitting aperture (166a, 266a, 366a, 466a). [13] Imaging lens (1, 2, 3, 4) according to claim 1, wherein a shortest distance between the first lens element (121, 221, 321, 421) and the first light-transmitting aperture (166a, 266a, 366a, 466a) is less than a shortest distance between the first lens element (121, 221, 321, 421) and the second light-transmitting aperture (188a, 288a, 388a, 488a). [14] Imaging lens (1, 2, 3, 4) comprising the following: a plurality of lens elements (12, 22, 32, 42) arranged along an optical axis (OA), wherein the plurality of lens elements (12, 22, 32, 42) comprises a first lens element (121, 221, 321, 421); a lens tube (14, 24, 34, 44) comprising: a tube section (142, 242, 342, 442) surrounding the optical axis (OA), wherein the plurality of lens elements (12, 22, 32, 42) are arranged in the tube section (142, 242, 342, 442); and an aperture section (144, 244, 344, 444) extending along a direction from the tube section (142, 242, 342, 442) to the optical axis (OA), wherein the aperture section (144, 244, 344, 444) has a tube aperture (144a, 244a, 344a, 444a) and a first step surface (144b, 244b, 344b, 444b); a first aperture element (16, 26, 36, 46), wherein the first lens element (121, 221, 321, 421) is located on one side of the first aperture element (16, 26, 36, 46) away from the aperture section (144, 244, 344, 444), the first aperture element (16, 26, 36, 46) and the first step surface (144b, 244b, 344b, 444b) form a gap (GP) between them, and the first aperture element (16, 26, 36, 46) has a first light-transmitting aperture (166a, 266a, 366a, 466a) arranged according to the tube aperture (144a, 244a, 344a, 444a). is; and a second opening element (18, 28, 38, 48) arranged in the gap (GP), wherein the second opening element (18, 28, 38, 48) has a second light-transmitting opening (188a, 288a, 388a, 488a) arranged opposite the first light-transmitting opening (166a, 266a, 366a, 466a). [15] Imaging lens (1, 2, 3) according to claim 14, wherein the aperture section (144, 244, 344) further comprises a second step surface (144d, 244d, 344d) which is arranged further away from the tube opening (144a, 244a, 344a) than the first step surface (144b, 244b, 344b); wherein the first opening element (16, 26, 36) further comprises a third step surface (166b, 266b, 366b) which is in physical contact with the second step surface (144d, 244d, 344d) of the opening section (144, 244, 344); wherein a minimum width of the gap (GP) between the first step surface (144b, 244b, 344b) and the first aperture element (16, 26, 36) in a direction parallel to the optical axis (OA) is G, a shortest distance in a direction parallel to the optical axis (OA) between the first step surface (144b, 244b, 344b) and the second step surface (144d, 244d, 344d) is D12 and the following condition is satisfied: 0.06≤G / D12≤0.

5. [16] Imaging lens (1, 2, 3) according to claim 15, wherein the second step surface (144d, 244d, 344d) is arranged further away from the optical axis (OA) than the first step surface (144b, 244b, 344b); wherein the opening section (144, 244, 344) further comprises a first connecting surface (144c, 244c, 344c) which connects the first step surface (144b, 244b, 344b) with the second step surface (144d, 244d, 344d); wherein the first aperture element (16, 26, 36) further comprises a second connecting surface (166c, 266c, 366c) extending along a direction from one side of the third step surface (166b, 266b, 366b) close to the optical axis (OA) to the first step surface (144b, 244b, 344b); wherein the first connecting surface (144c, 244c, 344c) is spaced apart from the second connecting surface (166c, 266c, 366c) and the opening section (144, 244, 344) and the first opening element (16, 26, 36) are each in contact with the second opening element (18, 28, 38) via the first connecting surface (144c, 244c, 344c) and the second connecting surface (166c, 266c, 366c). [17] Imaging lens (1, 2, 3, 4) according to claim 14, wherein the second aperture element (18, 28, 38, 48) is a light-blocking film; wherein a minimum width of the gap (GP) between the first step surface (144b, 244b, 344b, 444b) and the first aperture element (16, 26, 36, 46) in a direction parallel to the optical axis (OA) G is, a thickness of the light-blocking film T is and the following condition is met: 1.03≤G / T≤1.

97. [18] Imaging lens (2, 3) according to claim 14, wherein the aperture section (244, 344) further comprises a first conical surface (244e, 344e) which is inclined away from the optical axis (OA) in a direction from the tube aperture (244a, 344a) to the second aperture element (28, 38); wherein the first aperture element (26, 36) further comprises a second conical surface (266e, 366e) which is inclined away from the optical axis (OA) in a direction from the first transparent aperture (266a, 366a) to the second aperture element (28, 38); wherein at least one of the first conical surface (244e, 344e) and the second conical surface (266e, 366e) comprises an antireflection structure (AT) surrounding the optical axis (OA), and the antireflection structure (AT) comprises a plurality of protrusions. [19] Imaging lens (1, 2, 3, 4) according to claim 14, wherein each of the tube opening (144a, 244a, 344a, 444a), the first light-transmitting opening (166a, 266a, 366a, 466a) and the second light-transmitting opening (188a, 288a, 388a, 488a) has a maximum opening diameter; where the maximum aperture diameter of the tube opening (144a, 244a, 344a, 444a) is Dib, the maximum aperture diameter of the first light-transmitting opening (166a, 266a, 366a, 466a) is Di1, the maximum aperture diameter of the second light-transmitting opening (188a, 288a, 388a, 488a) is Di2, and the following conditions are met: 0.8≤Dib / Di2≤1.2; and 0.8≤Di1 / Di2≤1.

2. [20] Imaging lens (1, 2, 3, 4) according to claim 14, wherein a minimum thickness of the aperture section (144, 244, 344, 444) at the first step surface (144b, 244b, 344b, 444b) is in a direction parallel to the optical axis (OA) T1, a thickness of the first aperture element (16, 26, 36, 46) is in a direction parallel to the optical axis (OA) TS1 and the following condition is met: 0.14≤T1 / TS1≤0.

92. [21] Imaging lens (1, 2, 3, 4) according to claim 14, wherein a shortest distance between the first lens element (121, 221, 321, 421) and the first light-transmitting aperture (166a, 266a, 366a, 466a) is less than a shortest distance between the second aperture element (18, 28, 38, 48) and the first light-transmitting aperture (166a, 266a, 366a, 466a). [22] Imaging lens (1, 2, 3, 4) comprising the following: a plurality of lens elements (12, 22, 32, 42) arranged along an optical axis (OA), wherein the plurality of lens elements (12, 22, 32, 42) comprises a first lens element (121, 221, 321, 421); a lens tube (14, 24, 34, 44) comprising: a tube section (142, 242, 342, 442) surrounding the optical axis (OA), wherein the plurality of lens elements (12, 22, 32, 42) are arranged in the tube section (142, 242, 342, 442); and a tube opening (144a, 244a, 344a, 444a) element attached to the tube section (142, 242, 342, 442), wherein the tube opening (144a, 244a, 344a, 444a) element has an opening section (144, 244, 344, 444) extending along a direction to the optical axis (OA), and the opening section (144, 244, 344, 444) has a tube opening (144a, 244a, 344a, 444a) and a first step surface (144b, 244b, 344b, 444b); a first aperture element (16, 26, 36, 46), wherein the first lens element (121, 221, 321, 421) is located on one side of the first aperture element (16, 26, 36, 46) away from the aperture section (144, 244, 344, 444), the first aperture element (16, 26, 36, 46) and the first step surface (144b, 244b, 344b, 444b) form a gap (GP) between them, and the first aperture element (16, 26, 36, 46) has a first light-transmitting aperture (166a, 266a, 366a, 466a) arranged according to the tube aperture (144a, 244a, 344a, 444a). is; and a second opening element (18, 28, 38, 48) arranged in the gap (GP), wherein the second opening element (18, 28, 38, 48) has a second light-transmitting opening (188a, 288a, 388a, 488a) arranged opposite the first light-transmitting opening (166a, 266a, 366a, 466a). [23] Imaging lens (1, 2, 3) according to claim 22, wherein the aperture section (144, 244, 344) further comprises a second step surface (144d, 244d, 344d) which is arranged further away from the tube opening (144a, 244a, 344a) than the first step surface (144b, 244b, 344b); wherein the first opening element (16, 26, 36) is in physical contact with the second step surface (144d, 244d, 344d) of the opening section (144, 244, 344); where a minimum width of the gap (GP) between the first step surface (144b, 244b, 344b) and the first aperture element (16, 26, 36) in a direction parallel to the optical axis (OA) is G, a shortest distance in a direction parallel to the optical axis (OA) between the first step surface (144b, 244b, 344b) and the second step surface (144d, 244d, 344d) is D12 and the following condition is satisfied: 0.06≤G / D12≤0.

5. [24] Imaging lens (1, 2, 3, 4) according to claim 22, wherein the second aperture element (18, 28, 38, 48) is a light-blocking film; wherein a minimum width of the gap (GP) between the first step surface (144b, 244b, 344b, 444b) and the first aperture element (16, 26, 36, 46) in a direction parallel to the optical axis (OA) G is a thickness of the light-blocking film T and the following condition is met: 1.03≤G / T≤1.

97. [25] Imaging lens (2, 3) according to claim 22, wherein the aperture section (244, 344) further comprises a first conical surface (244e, 344e) which is inclined away from the optical axis (OA) in a direction from the tube aperture (244a, 344a) to the second aperture element (28, 38); wherein the first aperture element (26, 36) further comprises a second conical surface (266e, 366e) which is inclined away from the optical axis (OA) in a direction from the first transparent aperture (266a, 366a) to the second aperture element (28, 38); wherein at least one of the first conical surface (244e, 344e) and the second conical surface (266e, 366e) comprises an antireflection structure (AT) surrounding the optical axis (OA), and the antireflection structure (AT) comprises a plurality of protrusions. [26] Imaging lens (1, 2, 3, 4) according to claim 22, wherein each of the tube opening (144a, 244a, 344a, 444a), the first light-transmitting opening (166a, 266a, 366a, 466a) and the second light-transmitting opening (188a, 288a, 388a, 488a) has a maximum opening diameter; where the maximum aperture diameter of the tube opening (144a, 244a, 344a, 444a) is Dib, the maximum aperture diameter of the first light-transmitting opening (166a, 266a, 366a, 466a) is Di1, the maximum aperture diameter of the second light-transmitting opening (188a, 288a, 388a, 488a) is Di2, and the following conditions are met: 0.8≤Dib / Di2≤1.2; and 0.8≤Di1 / Di2≤1.

2. [27] Imaging lens (1, 2, 3, 4) according to claim 22, wherein a minimum thickness of the aperture section (144, 244, 344, 444) at the first step surface (144b, 244b, 344b, 444b) is in a direction parallel to the optical axis (OA) T1, a thickness of the first aperture element (16, 26, 36, 46) is in a direction parallel to the optical axis (OA) TS1 and the following condition is met: 0.14≤T1 / TS1≤0.

92. [28] Imaging lens (1, 2, 3, 4) according to claim 22, wherein a shortest distance between the first lens element (121, 221, 321, 421) and the first light-transmitting aperture (166a, 266a, 366a, 466a) is less than a shortest distance between the second aperture element (18, 28, 38, 48) and the first light-transmitting aperture (166a, 266a, 366a, 466a). [29] Image acquisition unit (100a, 100b, 200a, 200b, 200c, 200d, 300a, 300b, 300c, 300d, 300e, 300f, 300g, 300h, 300i, 400a), comprising: the imaging lens (1, 2, 3, 4) according to claim 1, 14 or 22. [30] Electronic device (100, 200, 300, 400), comprising: the image acquisition unit (100a, 100b, 200a, 200b, 200c, 200d, 300a, 300b, 300c, 300d, 300e, 300f, 300g, 300h, 300i, 400a) according to claim 29.

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