Imaging lens and electronic device

Abstract

Imaging lens (1) comprising: a plastic lens element (E1) having a central axis (CL), the plastic lens element (E1) comprising: an optically effective section (E10), wherein the central axis (CL) passes through a center of the optically effective section (E10); and a peripheral portion (E12) disposed adjacent to the optically effective portion (E10), the peripheral portion (E12) comprising: a first side surface (S11); a second side surface (S12) arranged opposite the first side surface (S11) in a direction parallel to the central axis (CL); and a connecting surface (S13) connected to the first side surface (S11) and the second side surface (S12), the connecting surface (S13) being arranged farther from the central axis (CL) than the first side surface (S11) and the second side surface (S12); wherein at least one of the first side surface (S11) and the second side surface (S12) has a structural region (R1), the plastic lens element (E1) further comprises a plurality of columnar projections (E14), the plurality of columnar projections (E14) are arranged in the structural region (R1) and arranged in a two-dimensional array, the plurality of columnar projections (E14) are connected to the structural region (R1) and projectingly extend from the structural region (R1), each of the plurality of columnar projections (E14) has a lower part (B1) and an upper part (T1) that are opposite to each other, a contour of each of the lower parts (B1) is circular, the lower parts (B1) are connected to the structural region (R1), and each of the upper parts (T1) has an arcuate surface; and wherein a projected area of ​​the structural region (R1) on a plane perpendicular to the central axis (CL) is A1, a number of the plurality of columnar projections (E14) is N 1, and the following condition is satisfied: 250 mm ⋅ 2 < N1 / A1 < 1500 mm ⋅ 2 .

Description

BACKGROUNDField of expertise

[0001] The present disclosure relates to an imaging lens and an electronic device, in particular to an imaging lens 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. Furthermore, due to rapid technological changes, smartphones equipped with optical systems are becoming more multifunctional for various applications, which has increased the requirements for the functionality of the optical systems.

[0003] In recent years, the use of miniature optical systems in mobile devices for photography has become increasingly popular. However, mobile devices are often exposed to strong sunlight when used outdoors, which significantly affects the optical systems due to strong non-imaging stray light. In particular, non-imaging light is easily reflected within the optical systems, significantly affecting image quality.

[0004] Conventional techniques for optical systems include processes such as dyeing, sandblasting, and coating the surfaces of optical elements to reduce reflectivity and eliminate stray light. While these processes can improve optical image quality, they are insufficient to eliminate high-intensity stray light. Furthermore, in the field of optical systems for non-mobile devices, other techniques for reducing reflectivity exist, such as the formation of porous microstructures on the surface of coatings. However, these structures lack sufficient support and are susceptible to deformation due to environmental influences, significantly reducing the anti-reflection effect.Therefore, improving the structure of internal components in optical systems to reduce the reflection intensity of non-imaging light has become a crucial challenge to meet the high requirements of modern electronic devices. SUMMARY

[0005] According to one aspect of the present disclosure, an imaging lens comprises a plastic lens element. The plastic lens element has a central axis, and the plastic lens element includes an optically effective portion and a peripheral portion. The central axis passes through a center of the optically effective portion. The peripheral portion is adjacently disposed around the optically effective portion, and the peripheral portion includes a first side surface, a second side surface, and a connecting surface. The second side surface is disposed opposite the first side surface in a direction parallel to the central axis. The connecting surface is connected to the first side surface and the second side surface, and the connecting surface is disposed farther from the central axis than the first side surface and the second side surface.In addition, at least one of the first side surface and the second side surface has a structural portion. The plastic lens element further includes a plurality of columnar protrusions, and the columnar protrusions are arranged in the structural portion and arranged in a two-dimensional array. The columnar protrusions are connected to the structural portion and protrude from the structural portion. Each of the columnar protrusions has a lower part and an upper part opposite to each other. A contour of each of the lower parts is circular, the lower parts are connected to the structural portion, and each of the upper parts has an arcuate surface. In addition, when a projected area of ​​the structural portion is on a plane perpendicular to the central axis A1 and a number of the plurality of columnar protrusions is N1, the following condition is satisfied: 250 mm. -2< N1 / A1 < 1500 mm -2 .

[0006] According to another aspect of the present disclosure, an electronic device includes the aforementioned imaging lens and an image sensor disposed on an image surface of the imaging lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The disclosure can be better understood from the following detailed description of the embodiments with reference to the accompanying drawings: Fig. 1 is a cross-sectional view of an imaging lens according to the first embodiment of the present disclosure; Fig. 2 is an enlarged view of section EL2 in Fig. 1; Fig. 3 is a perspective view of a first plastic lens element in Fig. 1; Fig. 4 is an enlarged view of section EL4 in Fig. 3; Fig. 5 is a top view of the first plastic lens element in Fig. 1; Fig. Figure 6 is a cross-sectional view of the first plastic lens element taken along line 6-6 in Fig. 5; Fig. Figure 7 is an enlarged view of section EL7 in Fig. 1; Fig. Figure 8 is an enlarged view of section EL8 in Fig. 1; Fig. 9 is a perspective view of a second plastic lens element in Fig. 1; Fig. 10 is an enlarged view of section EL10 in Fig. 9; Fig. 11 is a top view of the second plastic lens element in Fig. 1; Fig. 12 is a cross-sectional view of the second plastic lens element taken along line 12-12 in Fig. 11; Fig. 13 is an enlarged view of section EL13 in Fig. 12; Fig. 14 is an enlarged view of section EL14 in Fig. 1; Fig. 15 is a perspective view of a third plastic lens element in Fig. 1; Fig. 16 is an enlarged view of section EL16 in Fig. 15; Fig. 17 is a top view of the third plastic lens element in Fig. 1; Fig. Figure 18 is a cross-sectional view of the third plastic lens element taken along line 18-18 in Fig. 17; Fig. 19 is an enlarged view of section EL19 in Fig. 18; Fig. 20 is a cross-sectional view of an imaging lens according to the second embodiment of the present disclosure; Fig. 21 is an enlarged view of section EL21 in Fig. 20; Fig. 22 is a perspective view of a plastic lens element in Fig. 20; Fig. 23 is an enlarged view of section EL23 in Fig. 22; Fig. 24 is a bottom view of the plastic lens element in Fig. 20; Fig. 25 is a cross-sectional view of the plastic lens element taken along line 25-25 in Fig. 24; Fig. 26 is an enlarged view of section EL26 in Fig. 20; Fig. 27 is a cross-sectional view of an imaging lens according to the third embodiment of the present disclosure; Fig. 28 is an enlarged view of section EL28 in Fig. 27; Fig. 29 is a perspective view of a plastic lens element in Fig. 27; Fig. 30 is an enlarged view of section EL30 in Fig. 29; Fig. 31 is a top view of the plastic lens element in Fig. 27; Fig. 32 is a cross-sectional view of the plastic lens element taken along line 32-32 in Fig. 31; Fig. 33 is an enlarged view of section EL33 in Fig. 32; Fig. 34 is a perspective view of an electronic device according to the fourth embodiment of the present disclosure; Fig. 35 is another perspective view of the electronic device in Fig. 34; Fig. 36 is an illustration of an image captured by an ultra-wide angle camera module; Fig. 37 is an illustration of an image captured by a high-pixel camera module; Fig. 38 is an illustration of an image taken by a telephoto camera module; Fig. 39 is a perspective view of an electronic device according to the fifth embodiment of the present disclosure; Fig. 40 is a perspective view of an electronic device according to the sixth embodiment of the present disclosure; Fig. 41 is a side view of the electronic device in Fig. 40; and Fig. 42 is a top view of the electronic device in Fig. 40. DETAILED DESCRIPTION

[0008] In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, it will be apparent that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown schematically to simplify the drawing.

[0009] The present disclosure relates to an imaging lens. The imaging lens includes a plastic lens element. The plastic lens element has a central axis, and the plastic lens element includes an optically effective portion and a peripheral portion. Additionally, the central axis passes through a center of the optically effective portion, and the peripheral portion is disposed adjacent to the optically effective portion.

[0010] The peripheral portion includes a first side surface, a second side surface, and a connecting surface. The second side surface is arranged opposite the first side surface in a direction parallel to the central axis. The connecting surface is connected to the first side surface and the second side surface, and the connecting surface is arranged farther from the central axis than the first side surface and the second side surface. In addition, at least one of the first side surface and the second side surface has a structural region. For example, the first side surface and the second side surface may each face an object side and an image side of the imaging lens, but the present disclosure is not limited thereto.

[0011] The plastic lens element further comprises a plurality of columnar protrusions arranged in the structural region and arranged in a two-dimensional array. Furthermore, the two-dimensional array may be, for example, a circular array, a linear array, or a curved array, but the present disclosure is not limited thereto. The extent of the structural region may be defined by the arrangement area of ​​the columnar protrusions. For example, when the columnar protrusions are arranged in a circular array on the first side surface or the second side surface, the innermost columnar protrusions may define an inscribed circle, and the outermost columnar protrusions may define a circumscribed circle. Thus, the area formed between the inscribed circle and the circumscribed circle defines the extent of the structural region.

[0012] The columnar protrusions are connected to the structural portion and protrude from the structural portion. In addition, each of the columnar protrusions has a lower portion and an upper portion opposite each other. A contour of each of the lower portions is circular, the lower portions are connected to the structural portion, and each of the upper portions has an arcuate surface. Therefore, the circular configuration of the contour of the lower portion of the columnar protrusions is advantageous for reducing stray light between the columnar protrusions, and the circular configuration of the upper portion is advantageous for manufacturing and shaping the columnar protrusions. The circular contour of the lower portion may refer, for example, to the cross-section of the lower portion being circular or elliptical, but the present disclosure is not limited thereto.The arcuate surface of the upper part may be, for example, spherical or ellipsoidal, but the present disclosure is not limited thereto.

[0013] If a projected area of ​​the structural area on a plane perpendicular to the central axis is A1 and the number of columnar projections is N1, the following condition is satisfied: 250 mm -2 < N1 / A1 < 1500 mm -2 Therefore, the arrangement of the columnar projections at a suitable density is advantageous to achieve better stray light attenuation. Furthermore, the following condition can also be met: 450 mm -2 < N1 / A1 < 1100 mm -2 . In addition, the following condition can also be met: 500 mm -2 < N1 / A1 < 800 mm -2 .

[0014] When the number of columnar protrusions is N1, the following condition can be satisfied: 746 < N1 < 4500. Therefore, arranging the columnar protrusions in an appropriate number is advantageous for achieving better stray light attenuation. Furthermore, the following condition can also be satisfied: 783 < N1 < 2330. Furthermore, the following condition can also be satisfied: 814 < N1 < 1513.

[0015] When an angle between a surface of the structural region and the central axis is θ, the following condition can be satisfied: 0.86 < sinθ ≤ 1. Therefore, a suitable angle parameter is beneficial for the entry of stray light into a space between the columnar projections in the structural region, which can reduce the stray light between the columnar projections, and also beneficial for improving the molding quality of the columnar projections. In addition, the following condition can also be satisfied: 0.96 < sinθ < 1. See Fig. 2, which shows a schematic view of θ according to the first embodiment of the present disclosure.

[0016] When a projection height of each of the columnar projections in a direction parallel to the central axis is H1 and a distance between any two adjacent ones of the columnar projections is P1, the following condition may be satisfied: 0.2 < H1 / P1 < 0.8. Therefore, it is advantageous for reducing stray light between the columnar projections. In addition, the following condition may also be satisfied: 0.4 < H1 / P1 < 0.67. The projection height may refer to a height at which a center of a single columnar projection extends from the structure region in a direction parallel to the central axis, and the distance between adjacent columnar projections may refer to a distance between a center of one columnar projection and a center of an adjacent columnar projection. See Fig. 7, which shows a schematic view of H1 and P1 according to the first embodiment of the present disclosure.

[0017] A direction in which each of the columnar projections extends from the structural portion may be parallel to the central axis. Therefore, it is advantageous for improving the molding quality of the columnar projections.

[0018] According to the present disclosure, the imaging lens may further comprise an optical element and another plastic lens element, wherein the another plastic lens element is disposed closer to an image surface of the imaging lens than the plastic lens element, and the optical element is disposed adjacent to the another plastic lens element. The another plastic lens element includes a plurality of columnar projections each having a lower part and an upper part that oppose each other, and the upper parts of the columnar projections of the another plastic lens element may be in physical contact with the optical element. Therefore, it is advantageous to buffer the storage stress between the optical element and the plastic lens element to prevent deformation of the plastic lens element or the optical element.The optical element may be, for example, a tube, a lens element, a light blocking element, a spacer or a holder, or a filter, but the present disclosure is not limited thereto.

[0019] The plastic lens element may further include a light-absorbing coating, and the light-absorbing coating may cover the pattern area and reduce light reflection. Therefore, it is advantageous to further reduce the possibility of stray light reflection.

[0020] A surface of each of the other columnar protrusions may be a smooth surface. Therefore, it is advantageous to prevent damage to the optical element adjacent to the plastic lens element, thereby preventing an impact on the lens element assembly accuracy.

[0021] According to the present disclosure, the imaging lens may further comprise an adhesive member configured to secure the plastic lens element, and the columnar protrusions may be in physical contact with the adhesive member. Therefore, this is advantageous for preventing the adhesive member from overflowing and affecting other areas (e.g., the optically effective portion).

[0022] According to the present disclosure, an electronic device is provided. The electronic device includes an image sensor and the aforementioned imaging lens, and the image sensor is arranged on the image surface of the imaging lens.

[0023] According to the present disclosure, the above features and conditions can be used in numerous combinations to achieve corresponding effects.

[0024] In accordance with the above description of the present disclosure, the following specific embodiments are provided for further explanation. 1. Embodiment

[0025] Fig. 1 is a cross-sectional view of an imaging lens according to the first embodiment of the present disclosure, Fig. 2 is an enlarged view of section EL2 in Fig. 1, Fig. 3 is a perspective view of a first plastic lens element in Fig. 1, Fig. 4 is an enlarged view of section EL4 in Fig. 3, Fig. 5 is a top view of the first plastic lens element in Fig. 1, Fig. Figure 6 is a cross-sectional view of the first plastic lens element taken along line 6-6 in Fig. 5, and Fig. Figure 7 is an enlarged view of section EL7 in Fig. 1.

[0026] In this embodiment, an imaging lens 1 is provided. The imaging lens 1 includes a tube 11, a plurality of lens elements E0, E1, E2, and E3, a light-blocking element 13, a holder 15, and an image surface IMG. The lens elements E0, E1, E2, and E3, the light-blocking element 13, and the holder 15 are housed in the tube 11. After entering the tube 11, the light passes through the lens elements E0, E1, E2, and E3, the light-blocking element 13, and the holder 15 to form imaging light, which is then focused onto the image surface IMG.

[0027] The lens elements E0, E1, E2, and E3 include a first plastic lens element E1, a second plastic lens element E2, and a third plastic lens element E3. The third plastic lens element E3 is arranged closer to the image surface IMG than the first plastic lens element E1, and the second plastic lens element E2 is arranged between the first plastic lens element E1 and the third plastic lens element E3.

[0028] The light-blocking element 13 is arranged adjacent to the third plastic lens element E3, and the light-blocking element 13 is arranged between the second plastic lens element E2 and the third plastic lens element E3. Furthermore, the light-blocking element 13 is configured to block non-imaging light.

[0029] The holder 15 is in physical contact with the third plastic lens element E3, and the holder 15 is configured to secure the lens elements E0, E1, E2 and E3.

[0030] As in Fig. 3, Fig. 5 and Fig. As shown in Figure 6, the first plastic lens element E1 has a central axis CL, and the first plastic lens element E1 includes an optically effective portion E10, a peripheral portion E12, and a plurality of columnar protrusions E14. In addition, the central axis CL passes through a center of the optically effective portion E10, and the peripheral portion E12 is adjacently disposed around the optically effective portion E10.

[0031] The peripheral portion E12 includes a first side surface S11, a second side surface S12, and a connecting surface S13. The second side surface S12 is arranged opposite the first side surface S11 in a direction parallel to the central axis CL. The connecting surface S13 is connected to the first side surface S11 and the second side surface S12, and the connecting surface S13 is arranged farther from the central axis CL than the first side surface S11 and the second side surface S12. In addition, the first side surface S11 has a structural region R1.

[0032] As in Fig. 3 to Fig. As shown in Figure 5, the columnar protrusions E14 are arranged in the pattern region R1 and are arranged in a two-dimensional array. Furthermore, the columnar protrusions E14 are arranged in a two-dimensional circular array.

[0033] As in Fig. 2, Fig. 6 and Fig. As shown in Figure 7, the columnar protrusions E14 are connected to the structural portion R1 and protrude from the structural portion R1. In detail, each of the columnar protrusions E14 has a lower part B1 and an upper part T1 that oppose each other. A contour of each of the lower parts B1 is circular, the lower parts B1 are connected to the structural portion R1, and each of the upper parts T1 has an arcuate surface. Moreover, a direction in which each of the columnar protrusions E14 extends from the structural portion R1 is parallel to the central axis CL, and a surface of each of the columnar protrusions E14 is a smooth surface.

[0034] If the number of columnar projections E14 is N1, the following condition is satisfied: N1 = 300 × 2 = 600 (300 per ring, with a total of 2 rings).

[0035] As in Fig. 5, when a projected area of ​​the structural region R1 on a plane perpendicular to the central axis CL is A1 and the number of columnar projections E14 is N1, the following conditions are satisfied: A1 = 0.5564 mm 2 ; N1 = 600; and N1 / A1 = 1078.36 mm -2 .

[0036] As in Fig. As shown in Figure 2, when an angle between a surface of the structural region R1 and the central axis CL is θ, the following conditions are satisfied: θ = 85°; and sinθ = 0.996.

[0037] As in Fig. 7, when a projection height of each of the columnar projections E14 in a direction parallel to the central axis CL is H1 and a distance between any two adjacent ones of the columnar projections E14 is P1, the following conditions are satisfied: H1 = 0.02 mm; P1 = 0.0364 mm; and H1 / P1 = 0.55.

[0038] In this embodiment, in addition to the first plastic lens element E1 as described above, the second plastic lens element E2 may also be provided with columnar projections. Referring to Fig. 8 to Fig. 13 is Fig. 8 an enlarged view of section EL8 in Fig. 1, Fig. 9 is a perspective view of a second plastic lens element in Fig. 1, Fig. 10 is an enlarged view of section EL10 in Fig. 9, Fig. 11 is a top view of the second plastic lens element in Fig. 1, Fig. 12 is a cross-sectional view of the second plastic lens element taken along line 12-12 in Fig. 11 and Fig. 13 is an enlarged view of section EL13 in Fig. 12.

[0039] As in Fig. 9, Fig. 11 and Fig. As shown in Figure 12, the second plastic lens element E2 has a central axis CL, and the second plastic lens element E2 includes an optically effective portion E20, a peripheral portion E22, and a plurality of columnar protrusions E24. In addition, the central axis CL passes through a center of the optically effective portion E20, and the peripheral portion E22 is adjacently disposed around the optically effective portion E20.

[0040] The peripheral portion E22 comprises a first side surface S21, a second side surface S22, and a connecting surface S23. The second side surface S22 is arranged opposite the first side surface S21 in a direction parallel to the central axis CL. The connecting surface S23 is connected to the first side surface S21 and the second side surface S22, and the connecting surface S23 is arranged farther away from the central axis CL than the first side surface S21 and the second side surface S22. In addition, the first side surface S21 has a structural region R2.

[0041] As in Fig. 9 to Fig. 11, the columnar projections E24 are arranged in the structural region R2 and arranged in a two-dimensional array.

[0042] In addition, the columnar projections E24 are arranged in a two-dimensional circular array.

[0043] As in Fig. 8, Fig. 12 and Fig. As shown in Figure 13, the columnar protrusions E24 are connected to the structural portion R2 and protrude from the structural portion R2. In detail, each of the columnar protrusions E24 has a lower part B2 and an upper part T2 that oppose each other. A contour of each of the lower parts B2 is circular, the lower parts B2 are connected to the structural portion R2, and each of the upper parts T2 has an arcuate surface. Moreover, a direction in which each of the columnar protrusions E24 extends from the structural portion R2 is parallel to the central axis CL, and a surface of each of the columnar protrusions E24 is a smooth surface.

[0044] If the number of columnar projections E24 is N1, the following condition is satisfied: N1 = 720 × 4 = 2880 (720 per ring, with a total of 4 rings).

[0045] As in Fig. 11, when a projected area of ​​the structural region R2 on a plane perpendicular to the central axis CL is A1 and the number of columnar projections E24 is N1, the following conditions are satisfied: A1 = 3.8951 mm 2 ; N1 = 2880; and N1 / A1 = 739.39 mm -2 .

[0046] As in Fig. As shown in Figure 8, when an angle between a surface of the structural region R2 and the central axis CL is θ, the following conditions are satisfied: θ = 90°; and sinθ = 1.

[0047] As in Fig. As shown in Fig. 13, when a projection height of each of the columnar projections E24 in a direction parallel to the central axis CL is H1 and a distance between any two adjacent ones of the columnar projections E24 is P1, the following conditions are satisfied: H1 = 0.02 mm; P1 = 0.04 mm; and H1 / P1 = 0.5.

[0048] In this embodiment, in addition to the first plastic lens element E1 and the second plastic lens element E2 as described above, the third plastic lens element E3 may also be provided with columnar projections. Referring to Fig. 14 to Fig. 19 is Fig. 14 an enlarged view of section EL14 in Fig. 1, Fig. 15 is a perspective view of a third plastic lens element in Fig. 1, Fig. 16 is an enlarged view of section EL16 in Fig. 15, Fig. 17 is a top view of the third plastic lens element in Fig. 1, Fig. Figure 18 is a cross-sectional view of the third plastic lens element taken along line 18-18 in Fig. 17 and Fig. 19 is an enlarged view of section EL19 in Fig. 18.

[0049] As in Fig. 15, Fig. 17 and Fig. As shown in Figure 18, the third plastic lens element E3 has a central axis CL, and the third plastic lens element E3 includes an optically effective portion E30, a peripheral portion E32, and a plurality of columnar protrusions E34. In addition, the central axis CL passes through a center of the optically effective portion E30, and the peripheral portion E32 is adjacently disposed around the optically effective portion E30.

[0050] The peripheral portion E32 comprises a first side surface S31, a second side surface S32, and a connecting surface S33. The second side surface S32 is arranged opposite the first side surface S31 in a direction parallel to the central axis CL. The connecting surface S33 is connected to the first side surface S31 and the second side surface S32, and the connecting surface S33 is arranged farther from the central axis CL than the first side surface S31 and the second side surface S32. In addition, the first side surface S31 has a structural region R3.

[0051] As in Fig. 15 to Fig. As shown in Figure 17, the columnar protrusions E34 are arranged in the pattern region R3 and are arranged in a two-dimensional array. Furthermore, the columnar protrusions E34 are arranged in a two-dimensional circular array.

[0052] As in Fig. 14, Fig. 18 and Fig. 19, the columnar protrusions E34 are connected to the structural region R3 and protrude from the structural region R3. In detail, each of the columnar protrusions E34 has a lower part B3 and an upper part T3 that oppose each other. A contour of each of the lower parts B3 is circular, the lower parts B3 are connected to the structural region R3, and each of the upper parts T3 has an arcuate surface. Moreover, a direction in which each of the columnar protrusions E34 extends from the structural region R3 is parallel to the central axis CL, and a surface of each of the columnar protrusions E34 is a smooth surface. Furthermore, the upper parts T3 of the columnar protrusions E34 of the third plastic lens element E3 are in physical contact with the adjacent optical element (the light-blocking element 13).

[0053] If the number of columnar projections E34 is N1, the following condition is satisfied: N1 = 480 × 4 = 1920 (480 per ring, with a total of 4 rings).

[0054] As in Fig. 17, when a projected area of ​​the structural region R3 on a plane perpendicular to the central axis CL is A1 and the number of columnar projections E34 is N1, the following conditions are satisfied: A1 = 7.6619 mm 2 ; N1 = 1920; and N1 / A1 = 250.59 mm -2 .

[0055] As in Fig. As shown in Figure 14, when an angle between a surface of the structural region R3 and the central axis CL is θ, the following conditions are satisfied: θ = 90°; and sinθ = 1.

[0056] As in Fig. As shown in Fig. 19, when a projection height of each of the columnar projections E34 in a direction parallel to the central axis CL is H1 and a distance between any two adjacent ones of the columnar projections E34 is P1, the following conditions are satisfied: H1 = 0.04 mm; P1 = 0.08 mm; and H1 / P1 = 0.5. 2. Embodiment

[0057] Fig. 20 is a cross-sectional view of an imaging lens according to the second embodiment of the present disclosure, Fig. 21 is an enlarged view of section EL21 in Fig. 20, Fig. 22 is a perspective view of a plastic lens element in Fig. 20, Fig. 23 is an enlarged view of section EL23 in Fig. 22, Fig. 24 is a bottom view of the plastic lens element in Fig. 20, Fig. 25 is a cross-sectional view of the plastic lens element taken along line 25-25 in Fig. 24, and Fig. 26 is an enlarged view of section EL26 in Fig. 20.

[0058] In this embodiment, an imaging lens 2 is provided. The imaging lens 2 includes a tube 21, a plurality of lens elements E0 and E4, an adhesive element 27, and an image surface IMG. The lens elements E0 and E4 and the adhesive element 27 are housed in the tube 21, and after entering the tube 21, light passes through the lens elements E0 and E4 to form imaging light, which is then focused onto the image surface IMG.

[0059] The lens elements E0 and E4 include a plastic lens element E4, and the plastic lens element E4 is arranged closer to the image surface IMG than other lens elements E0 in the imaging lens 2.

[0060] The adhesive element 27 is in physical contact with the plastic lens element E4 and is designed to secure the lens elements E0 and E4.

[0061] As in Fig. 22, Fig. 24 and Fig. As shown in Figure 25, the plastic lens element E4 has a central axis CL, and the plastic lens element E4 includes an optically effective portion E40, a peripheral portion E42, and a plurality of columnar projections E44. In addition, the central axis CL passes through a center of the optically effective portion E40, and the peripheral portion E42 is adjacently disposed around the optically effective portion E40.

[0062] The peripheral portion E42 includes a first side surface S41, a second side surface S42, and a connecting surface S43. The second side surface S42 is arranged opposite the first side surface S41 in a direction parallel to the central axis CL. The connecting surface S43 is connected to the first side surface S41 and the second side surface S42, and the connecting surface S43 is arranged farther from the central axis CL than the first side surface S41 and the second side surface S42. In addition, the second side surface S42 has a structural region R4.

[0063] As in Fig. 21 to Fig. As shown in Figure 24, the columnar protrusions E44 are arranged in the pattern region R4 and arranged in a two-dimensional array. Furthermore, the columnar protrusions E44 are arranged in a two-dimensional circular array, and the columnar protrusions E44 are in physical contact with the adhesive member 27.

[0064] As in Fig. 21, Fig. 25 and Fig. As shown in Figure 26, the columnar protrusions E44 are connected to the structural portion R4 and protrude from the structural portion R4. In detail, each of the columnar protrusions E44 has a lower part B4 and an upper part T4 that oppose each other. A contour of each of the lower parts B4 is circular, the lower parts B4 are connected to the structural portion R4, and each of the upper parts T4 has an arcuate surface. Moreover, a direction in which each of the columnar protrusions E44 extends from the structural portion R4 is parallel to the central axis CL, and a surface of each of the columnar protrusions E44 is a smooth surface.

[0065] If the number of columnar projections E44 is N1, the following condition is satisfied: N1 = 720 × 3 = 2160 (720 per ring, with a total of 3 rings).

[0066] As in Fig. 24, when a projected area of ​​the structural region R4 on a plane perpendicular to the central axis CL is A1 and the number of columnar projections E44 is N1, the following conditions are satisfied: A1 = 3.6373 mm 2 ; N1 = 2160; and N1 / A1 = 593.85 mm -2 .

[0067] As in Fig. As shown in Figure 21, when an angle between a surface of the structural region R4 and the central axis CL is θ, the following conditions are satisfied: θ = 90°; and sinθ = 1.

[0068] As in Fig. 26, when a projection height of each of the columnar projections E44 in a direction parallel to the central axis CL is H1 and a distance between any two adjacent ones of the columnar projections E44 is P1, the following conditions are satisfied: H1 = 0.02 mm; P1 = 0.03 mm; and H1 / P1 = 0.66. 3. Embodiment

[0069] Fig. 27 is a cross-sectional view of an imaging lens according to the 3rd embodiment of the present disclosure, Fig. 28 is an enlarged view of section EL28 in Fig. 27, Fig. 29 is a perspective view of a plastic lens element in Fig. 27, Fig. 30 is an enlarged view of section EL30 in Fig. 29, Fig. 31 is a top view of the plastic lens element in Fig. 27, Fig. 32 is a cross-sectional view of the plastic lens element taken along line 32-32 in Fig. 31, and Fig. 33 is an enlarged view of section EL33 in Fig. 32.

[0070] In this embodiment, an imaging lens 3 is provided. The imaging lens 3 includes a tube 31, a plurality of lens elements E0 and E5, and an image surface IMG. The lens elements E0 and E5 are housed in the tube 31, and after entering the tube 31, light passes through the lens elements E0 and E5 to form imaging light, which is then focused onto the image surface IMG.

[0071] The lens elements E0 and E5 include a plastic lens element E5, and the plastic lens element E5 is arranged closer to an imaged object than other lens elements E0 in the imaging lens 3.

[0072] As in Fig. 29, Fig. 31 and Fig. As shown in Figure 32, the plastic lens element E5 has a central axis CL, and the plastic lens element E5 includes an optically effective portion E50, a peripheral portion E52, a plurality of columnar protrusions E54, and a light-absorbing coating E56. In addition, the central axis CL passes through a center of the optically effective portion E50, and the peripheral portion E52 is adjacently disposed around the optically effective portion E50.

[0073] The peripheral portion E52 includes a first side surface S51, a second side surface S52, and a connecting surface S53. The second side surface S52 is arranged opposite the first side surface S51 in a direction parallel to the central axis CL. The connecting surfaces S53 are connected to the first side surface S51 and the second side surface S52, and the connecting surface S53 is arranged farther from the central axis CL than the first side surface S51 and the second side surface S52. In addition, the first side surface S51 has a structural region R5.

[0074] As in Fig. 29 to Fig. As shown in Figure 31, the columnar protrusions E54 are arranged in the structural region R5 and arranged in a two-dimensional array. Furthermore, the columnar protrusions E54 are arranged in a two-dimensional circular array.

[0075] As in Fig. 28, Fig. 32 and Fig. 33, the columnar protrusions E54 are connected to the structural portion R5 and protrude from the structural portion R5. In detail, each of the columnar protrusions E54 has a lower part B5 and an upper part T5 that oppose each other. A contour of each of the lower parts B5 is circular, the lower parts B5 are connected to the structural portion R5, and each of the upper parts T5 has an arcuate surface. Moreover, a direction in which each of the columnar protrusions E54 extends from the structural portion R5 is parallel to the central axis CL, and a surface of each of the columnar protrusions E54 is a smooth surface.

[0076] As in Fig. 28 and Fig. 33, the light-absorbing coating E56 covers the pattern region R5 and the columnar protrusions E54, and the light-absorbing coating E56 is configured to reduce light reflection.

[0077] If the number of columnar projections E54 is N1, the following condition is satisfied: N1 = 360 × 5 = 1800 (360 per ring, with a total of 5 rings).

[0078] As in Fig. 31, when a projected area of ​​the structural region R5 on a plane perpendicular to the central axis CL is A1 and the number of columnar projections E54 is N1, the following conditions are satisfied: A1 = 2.9992 mm 2 ; N1 = 1800; and N1 / A1 = 600.16 mm -2 .

[0079] As in Fig. As shown in Figure 28, when an angle between a surface of the structural region R5 and the central axis CL is θ, the following conditions are satisfied: θ = 90°; and sinθ = 1.

[0080] As in Fig. 33, when a projection height of each of the columnar projections E54 in a direction parallel to the central axis CL is H1 and a distance between any two adjacent ones of the columnar projections E54 is P1, the following conditions are satisfied: H1 = 0.01 mm; P1 = 0.04 mm; and H1 / P1 = 0.25. 4. Embodiment

[0081] Fig. 34 is a perspective view of an electronic device according to the fourth embodiment of the present disclosure, and Fig. 35 is another perspective view of the electronic device in Fig. 34.

[0082] In this embodiment, the electronic device 200 is a smartphone that includes a plurality of camera modules, a flash module 201, a focus assist module 202, an image signal processor 203, a display module (user interface) 204, an image software processor (not shown), and an image sensor (not shown).

[0083] These camera modules include an ultra-wide-angle camera module 200a, a high-pixel camera module 200b, a telephoto camera module 200c, and a telephoto camera module 200d. Furthermore, at least one of the camera modules 200a, 200b, 200c, and 200d may include the imaging lens of the present disclosure. The image sensor is arranged on the image surface of the imaging lens.

[0084] The image captured by the ultra-wide angle camera module 200a includes a feature of multiple imaged objects. Fig. 36 is an image captured by the ultra-wide-angle camera module 200a.

[0085] The image captured by the high-pixel camera module 200b has a high-resolution and low-distortion feature, and the high-pixel camera module 200b can convert a part of the image into Fig. Record 36. Fig. 37 is an image captured by the high-pixel camera module 200b.

[0086] The image captured by the telephoto camera module 200c or the telephoto camera module 200d has a high optical magnification feature, and the telephoto camera module 200c or the telephoto camera module 200d can Fig. 37 capture. Fig. 38 is an image taken by the telephoto camera module 200c or the telephoto camera module 200d.

[0087] When a user captures images of an object, the light beams in the ultra-wide-angle camera module 200a, the high-pixel camera module 200b, the telephoto camera module 200c, or the telephoto camera module 200d are focused to create images, and the flash module 201 is activated to provide light assistance. The focus assist module 202 detects the distance of the imaged object to achieve fast automatic focusing. The image signal processor 203 is configured to optimize the captured image to improve the image quality provided by the 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 may include a touchscreen, and the user can interact with the display module 204 to adjust the viewing angle and switch between different camera modules. The image software processor has multiple 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. 5. Embodiment

[0088] See Fig. 39, which is a perspective view of an electronic device according to the 5th embodiment of the present disclosure.

[0089] In this embodiment, the electronic device 300 is a smartphone that includes a camera module 300a, a camera module 300b, a camera module 300c, a camera module 300d, a camera module 300e, a camera module 300f, a camera module 300g, a camera module 300h, a camera module 300i, a flash module 301, an image signal processor, a display module, an image software processor (not shown), and an image sensor. The camera module 300a, the camera module 300b, the camera module 300c, the camera module 300d, the camera module 300e, the camera module 300f, the camera module 300g, the camera module 300h, and the camera module 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, at least one of the camera modules 300a, 300b, 300d, 300e, 300f, 300g, 300h, and 300i may include the imaging lens of the present disclosure.The image sensor is arranged on the image surface of the imaging lens.

[0090] The camera module 300a is a telephoto camera module, the camera module 300b is a telephoto camera module, the camera module 300c is a telephoto camera module, the camera module 300d is a telephoto camera module, the camera module 300e is a wide-angle camera module, the camera module 300f is a wide-angle camera module, the camera module 300g is an ultra-wide-angle camera module, the camera module 300h is a ToF (Time of Flight) camera module, and the camera module 300i is an ultra-wide-angle camera module. In this embodiment, the camera module 300i, the camera module 300a, the camera module 300b, the camera module 300c, the camera module 300d, the camera module 300e, the camera module 300f, and the camera module 300g have different fields of view so that the electronic device 300 can have different magnification ratios to meet the requirement of optical zoom functionality.Furthermore, camera module 300a and camera module 300b are telephoto camera modules with a light-directing configuration. Furthermore, camera module 300h can determine depth information of the imaged object. In this embodiment, electronic device 300 includes multiple camera modules 300a, 300b, 300c, 300d, 300e, 300f, 300g, 300h, and 300i, but the present disclosure is not limited to the number and arrangement of the camera modules. When a user takes pictures of an object, the light rays in the camera module 300a, the camera module 300b, the camera module 300c, the camera module 300d, the camera module 300e, the camera module 300f, the camera module 300g, the camera module 300h, or the camera module 300i are concentrated to produce one or more images, and the flash module 301 is activated for light support.Furthermore, the subsequent processes are performed in a similar manner to the above-mentioned embodiments, so the details thereof will not be given again. 6. Embodiment

[0091] Fig. 40 is a perspective view of an electronic device according to the 6th embodiment of the present disclosure, Fig. 41 is a side view of the electronic device in Fig. 40 and Fig. 42 is a top view of the electronic device in Fig. 40.

[0092] In this embodiment, the electronic device 400 is a motor vehicle. The electronic device 400 includes a plurality of vehicle camera modules 400a and image sensors (not shown), and the camera modules 400a each include the imaging lens of the present disclosure. The camera modules 400a can serve, for example, as panoramic car cameras, dashboard cameras, and vehicle rearview cameras. The image sensors are arranged on the image surfaces of the imaging lenses.

[0093] As in Fig. For example, as shown in Figure 40, the camera modules 400a are arranged around the motor vehicle to capture peripheral images of the motor vehicle, which is advantageous for obtaining external traffic information to achieve an autopilot function. Additionally, the image software processor can combine the peripheral images into a panoramic image for the driver to check all corners around the motor vehicle, which is advantageous for parking and driving.

[0094] As in Fig. As shown in Figure 41, the camera modules 400a are arranged, for example, at the lower portion of the side mirrors. A maximum field of view of the camera modules 400a can be 40 degrees to 90 degrees to capture images in sections in the left and right lanes.

[0095] As in Fig.42, the camera modules 400a may also be arranged, for example, at the lower portion of the side mirrors and inside the front and rear windshields, respectively, to provide external information to the driver and also provide more viewing angles to reduce blind spots, thereby improving driving safety.

[0096] The smartphones, panoramic car cameras, dashboard cameras, and vehicle rearview cameras in the embodiments are merely examples of illustrating the imaging lens of the present disclosure installed in an electronic device, and the present disclosure is not limited thereto. The imaging lens can optionally be used in moving-focus optical systems. Furthermore, the imaging lens has good aberration correction capability and high image quality and can be used in 3D image recording applications in products such as digital cameras, mobile devices, digital tablets, smart TVs, network monitoring devices, multi-camera devices, image recognition systems, motion sensor input devices, wearable devices, and other electronic imaging devices.

[0097] The foregoing description has been described with reference to specific embodiments for the purpose of illustration. It should be noted that the present disclosure shows different data of the various embodiments; however, the data of the various embodiments were obtained from experiments. The embodiments were chosen and described in order to best explain the principles of the disclosure and their practical applications to enable others skilled in the art to best utilize the disclosure and various embodiments with various modifications as are suited to particular uses. The above-illustrated embodiments and the accompanying drawings are exemplary and are not intended to be exhaustive or to limit the scope of the present disclosure to the precise forms disclosed. Many modifications and variations are possible in light of the above teachings.

Claims

[1] Imaging lens (1) comprising: a plastic lens element (E1) having a central axis (CL), the plastic lens element (E1) comprising: an optically effective section (E10), wherein the central axis (CL) passes through a center of the optically effective section (E10); and a peripheral portion (E12) disposed adjacent to the optically effective portion (E10), the peripheral portion (E12) comprising: a first side surface (S11); a second side surface (S12) arranged opposite the first side surface (S11) in a direction parallel to the central axis (CL); and a connecting surface (S13) connected to the first side surface (S11) and the second side surface (S12), the connecting surface (S13) being arranged farther from the central axis (CL) than the first side surface (S11) and the second side surface (S12); wherein at least one of the first side surface (S11) and the second side surface (S12) has a structural region (R1), the plastic lens element (E1) further comprises a plurality of columnar projections (E14), the plurality of columnar projections (E14) are arranged in the structural region (R1) and arranged in a two-dimensional array, the plurality of columnar projections (E14) are connected to the structural region (R1) and projectingly extend from the structural region (R1), each of the plurality of columnar projections (E14) has a lower part (B1) and an upper part (T1) that are opposite to each other, a contour of each of the lower parts (B1) is circular, the lower parts (B1) are connected to the structural region (R1), and each of the upper parts (T1) has an arcuate surface; and wherein a projected area of ​​the structural region (R1) on a plane perpendicular to the central axis (CL) is A1, a number of the plurality of columnar projections (E14) is N 1, and the following condition is satisfied: 250 mm⋅2 <N1 / A1<1500 mm⋅2. [2] The imaging lens (1) according to claim 1, wherein the projected area of ​​the pattern region (R1) on the plane perpendicular to the central axis (CL) is A1, the number of the plurality of columnar projections (E14) is N1, and the following condition is satisfied: 450 mm−2 <N1 / A1<1100 mm−2. [3] The imaging lens (2) according to claim 2, wherein the projected area of ​​the pattern region (R4) on the plane perpendicular to the central axis (CL) is A1, the number of the plurality of columnar projections (E44) is N1, and the following condition is satisfied: 500 mm−2 <N1 / A1<800 mm−2. [4] The imaging lens (2) according to claim 1, wherein the number of the plurality of columnar projections (E44) is N1 and the following condition is satisfied: 746 <N1<4500. [5] An imaging lens (2) according to claim 4, wherein the number of the plurality of columnar projections (E44) is N1 and the following condition is satisfied: 783 <N1<2330. [6] An imaging lens (2) according to claim 5, wherein the number of the plurality of columnar projections is N1 and the following condition is satisfied: 814 <N1<1513. [7] The imaging lens (1) according to claim 1, wherein an angle between a surface of the pattern region (R1) and the central axis (CL) is θ and the following condition is satisfied: 0.86 <sinθ≤1. [8] Imaging lens (1) according to claim 7, wherein the angle between the surface of the structural region (R1) and the central axis (CL) is θ and the following condition is satisfied: 0.96 <sinθ<1. [9] The imaging lens (1) according to claim 7, wherein a projection height of each of the plurality of columnar projections (E14) in a direction parallel to the central axis (CL) is H1, a distance between any two adjacent ones of the plurality of columnar projections (E14) is P1, and the following condition is satisfied: 0.2 [10] The imaging lens (1) according to claim 9, wherein the projection height of each of the plurality of columnar projections (E14) in the direction parallel to the central axis (CL) is H1, the distance between any two adjacent ones of the plurality of columnar projections (E14) is P1, and the following condition is satisfied: 0.4 [11] The imaging lens (1) according to claim 7, wherein a direction in which each of all the columnar projections (E14) extends from the pattern region (R1) is parallel to the central axis (CL). ​​[12] The imaging lens (1) according to claim 1, further comprising an optical element (13) and another plastic lens element (E3), wherein the another plastic lens element (E3) is arranged closer to an image surface (IMG) than the plastic lens element (E1), the optical element (13) is arranged adjacent to the another plastic lens element (E3), the another plastic lens element (E3) comprises a plurality of columnar projections (E34), each of the plurality of columnar projections (E34) having a lower part (B3) and an upper part (T3) which are opposite to each other, and the upper parts (T3) of the plurality of columnar projections (E34) are in physical contact with the optical element (13). [13] The imaging lens (3) according to claim 1, wherein the plastic lens element (E5) further comprises a light-absorbing coating (E56) covering the structural region (R5) and configured to reduce light reflection. [14] The imaging lens (1) according to claim 1, wherein a surface of each of the plurality of columnar projections (E14) is a smooth surface. [15] The imaging lens (2) according to claim 1, further comprising an adhesive member (27) configured to secure the plastic lens element (E4), wherein the plurality of columnar projections (E44) are in physical contact with the adhesive member (27). [16] Electronic device (200) comprising: the imaging lens (1) according to claim 1; and an image sensor arranged on an image surface of the imaging lens (1).

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