Imaging lenses, camera modules and electronic devices

Abstract

This invention proposes an imaging lens, a camera module, and an electronic device. The imaging lens includes a plastic optical lens element, a lens barrel, and a light-absorbing coating. The plastic optical lens element has an object-side surface, an image-side surface, and an outer diameter surface. The outer diameter surface connects the object-side surface and the image-side surface. The lens barrel houses the plastic optical lens element. The lens barrel includes a dish-shaped portion and a sidewall portion. The dish-shaped portion has a light-transmitting aperture. The optical axis of the imaging lens passes through the light-transmitting aperture. The sidewall portion corresponds to the outer diameter surface of the plastic optical lens element. The light-absorbing coating has an inner surface and an outer surface. The inner surface is fixed to the outer diameter surface of the plastic optical lens element. The outer surface is positioned opposite to the inner surface and is farther away from the outer diameter surface of the plastic optical lens element than the inner surface, and the outer surface contacts the sidewall portion of the lens barrel. This invention also discloses a camera module having the above-described imaging lens and an electronic device having the camera module.

Description

[0001] This application is a divisional application. The original application was filed on April 1, 2021; the application number is 202110355732.2; and the invention title is: Imaging Lens, Camera Module and Electronic Device. Technical Field

[0002] This invention relates to an imaging lens, a camera module, and an electronic device, particularly an imaging lens and camera module suitable for electronic devices. Background Technology

[0003] With advancements in semiconductor technology, the performance of electronic image sensors has improved, and pixels can be made smaller. As a result, optical lenses with high image quality have become an indispensable component.

[0004] With the rapid advancement of technology, electronic devices equipped with optical lenses are being used in a wider range of applications, leading to more diverse requirements for these lenses. Since traditional optical lenses have struggled to balance requirements such as image quality and assembly yield, this invention provides an optical lens that meets these needs. Summary of the Invention

[0005] This invention provides an imaging lens, a camera module, and an electronic device. Under certain conditions, the imaging lens provided by this invention can simultaneously meet the requirements of high image quality and high assembly yield.

[0006] An embodiment of the present invention provides an imaging lens having an object side, an image side, and an optical axis; the image side is positioned opposite to the object side; the optical axis passes through the object side and the image side; the imaging lens includes a plastic optical lens element, a lens barrel, and a light-absorbing coating; the plastic optical lens element has an object-side surface, an image-side surface, and an outer diameter surface; the object-side surface faces the object side of the imaging lens; the image-side surface faces the image side of the imaging lens; the outer diameter surface connects the object-side surface and the image-side surface; the lens barrel has an internal space; the internal space accommodates the plastic optical lens element; the lens barrel includes a dish-shaped portion and a sidewall portion; the dish-shaped portion has a light-transmitting aperture; the optical axis of the imaging lens passes through the light-transmitting aperture; the sidewall portion connects to the dish-shaped portion; the sidewall portion... The wall portion corresponds to the outer diameter surface of the plastic optical lens element; the light-absorbing coating is fixed to the outer diameter surface of the plastic optical lens element and substantially contacts the lens barrel; the light-absorbing coating has an inner surface and an outer surface; the inner surface faces and is fixed to the outer diameter surface of the plastic optical lens element; the position of the outer surface is opposite to the position of the inner surface, and the outer surface is farther away from the outer diameter surface of the plastic optical lens element than the inner surface; the outer surface substantially contacts the side wall portion of the lens barrel; the length of the substantial contact between the outer surface of the light-absorbing coating and the side wall portion of the lens barrel along a direction substantially parallel to the optical axis is LA, and the length of the inner surface of the light-absorbing coating along a direction substantially parallel to the optical axis is LT, which satisfies the following condition:

[0007] 0.1≤LA / LT≤0.95.

[0008] Another embodiment of the present invention provides a camera module that includes the above-described imaging lens.

[0009] Another embodiment of the present invention provides an electronic device comprising the above-mentioned camera module and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on the imaging surface of the imaging lens.

[0010] A light-absorbing coating is fixed to the outer diameter surface of the plastic optical lens element, allowing the coating to contact the sidewall of the lens barrel. When the LA / LT meets the above conditions, the intensity of non-imaging light reflected from the outer diameter surface is reduced, thereby improving image quality. Furthermore, during the assembly of the imaging lens, the thickness of the light-absorbing coating in contact with the lens barrel provides an adjustment margin between the outer diameter surface of the plastic optical lens element and the lens barrel, thus improving the assembly yield.

[0011] The above description of the content of this invention and the following description of the embodiments are used to demonstrate and explain the principles of this invention, and to provide a further explanation of the scope of the patent application of this invention. Attached Figure Description

[0012] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:

[0013] Figure 1 A perspective view of a partially sectional imaging lens according to a first embodiment of the present invention is shown.

[0014] Figure 2 An exploded view of an imaging lens according to a first embodiment of the present invention is shown.

[0015] Figure 3 Draw Figure 2 A side view cross-sectional diagram of the imaging lens.

[0016] Figure 4 Draw Figure 3 A side view cross-sectional diagram of the seventh lens of the imaging lens.

[0017] Figure 5 Draw Figure 3 A magnified schematic diagram of the AA region of the imaging lens.

[0018] Figure 6 Draw Figure 5 A magnified diagram of the BB region of the imaging lens.

[0019] Figure 7 A side view cross-sectional schematic diagram of an imaging lens according to a second embodiment of the present invention is shown.

[0020] Figure 8 Draw Figure 7 A magnified schematic diagram of the CC region of the imaging lens.

[0021] Figure 9 Draw Figure 8 A magnified schematic diagram of the DD region of the imaging lens.

[0022] Figure 10 Draw Figure 8 A magnified schematic diagram of the EE region of the imaging lens.

[0023] Figure 11 Draw Figure 8 A magnified schematic diagram of the FF region of the imaging lens.

[0024] Figure 12 Draw Figure 8 A magnified schematic diagram of the GG region of the imaging lens.

[0025] Figure 13 A side view cross-sectional schematic diagram of an imaging lens according to a third embodiment of the present invention is shown.

[0026] Figure 14 Draw Figure 13 A magnified schematic diagram of the HH region of the imaging lens.

[0027] Figure 15 Draw Figure 14 A magnified schematic diagram of region II of the imaging lens.

[0028] Figure 16 Draw Figure 14 A magnified diagram of the JJ region of the imaging lens.

[0029] Figure 17 Draw Figure 14 A magnified schematic diagram of the KK region of the imaging lens.

[0030] Figure 18 A side view cross-sectional schematic diagram of an imaging lens according to a fourth embodiment of the present invention is shown.

[0031] Figure 19 Draw Figure 18 A magnified schematic diagram of the LL region of the imaging lens.

[0032] Figure 20 Draw Figure 19 A magnified schematic diagram of the MM region of the imaging lens.

[0033] Figure 21 A perspective view of an imaging lens according to a fifth embodiment of the present invention is shown.

[0034] Figure 22 A perspective view of a sectional imaging lens according to a fifth embodiment of the present invention is shown.

[0035] Figure 23 Draw Figure 22 A side view cross-sectional diagram of the imaging lens.

[0036] Figure 24 Draw Figure 23 A side view cross-sectional diagram of the first lens of the imaging lens.

[0037] Figure 25 Draw Figure 23 A magnified schematic diagram of the NN region of the imaging lens.

[0038] Figure 26 Draw Figure 25 A magnified schematic diagram of the OO region of the imaging lens.

[0039] Figure 27 Draw Figure 23 A magnified schematic diagram of the PP area of ​​the imaging lens.

[0040] Figure 28 Draw Figure 27 A magnified diagram of the QQ area of ​​the imaging lens.

[0041] Figure 29 A side cross-sectional view of an imaging lens according to a sixth embodiment of the present invention is shown.

[0042] Figure 30 Draw Figure 29 A magnified schematic diagram of the RR region of the imaging lens.

[0043] Figure 31 Draw Figure 30 A magnified schematic diagram of the SS region of the imaging lens.

[0044] Figure 32 A perspective view of a camera module according to a seventh embodiment of the present invention is shown.

[0045] Figure 33 A perspective view of one side of an electronic device according to an eighth embodiment of the present invention is shown.

[0046] Figure 34 Draw Figure 33 A three-dimensional diagram of the other side of the electronic device.

[0047] Figure 35 Draw Figure 33 System block diagram of an electronic device.

[0048] Explanation of icon numbers:

[0049] 1, 2, 3, 4, 5, 6… Imaging lenses

[0050] 101, 201, 301, 401, 501, 601… Object side

[0051] 102, 202, 302, 402, 502, 602… Image side

[0052] 103, 203, 303, 403, 503, 603… Imaging planes

[0053] 104, 204, 304, 404, 504, 604… optical axes

[0054] 11, 21, 31, 41, 51, 61… Plastic optical lens elements

[0055] 11a, 21a, 31a, 41a, 51a, 61a… First lens

[0056] 11b, 21b, 31b, 41b, 51b, 61b… Second lens

[0057] 11c, 21c, 31c, 41c, 51c, 61c… Third lens

[0058] 11d, 21d, 31d, 41d… Fourth Lens

[0059] 11e, 21e, 31e, 41e… Fifth Lens

[0060] 11f, 21f, 31f, 41f… Sixth lens

[0061] 11g, 21g, 31g, 41g… The Seventh Lens

[0062] 11h, 21h, 31h, 41h… Eighth lens

[0063] 111g, 211a, 211b, 211c, 311d, 311e, 311f, 411h, 511a, 611b… object side surface

[0064] 112g, 212a, 212b, 212c, 312d, 312e, 312f, 412h, 512a, 612b… like side surfaces

[0065] 113g, 213a, 213b, 213c, 313d, 313e, 313f, 413h, 513a, 613b… outer diameter surface

[0066] 214a, 214b, 214c, 514a… Axial connection structure

[0067] 115g, 515a... Reduced noodle size

[0068] 116g, 516a... Injection marks

[0069] 12, 22, 32, 42, 52, 62… telescope tubes

[0070] 121, 221, 321, 421, 521, 621… Interior space

[0071] 122, 222, 322, 422, 522, 622… Disc-shaped section

[0072] 1221, 2221, 3221, 4221, 5221, 6221… Light transmission holes

[0073] 123, 223, 323, 423, 523, 623… Side wall section

[0074] 13g, 23, 23a, 23b, 23c, 33, 33d, 33e, 33f, 43h, 53a, 63b… Light-absorbing coatings

[0075] 131g, 231a, 231b, 231c, 331d, 331e, 331f, 431h, 531a, 631b… inner surface

[0076] 132g, 232a, 232b, 232c, 332d, 332e, 332f, 432h, 532a, 632b… outer surface

[0077] 54…Auxiliary light-absorbing coating

[0078] 541…Inner surface

[0079] 542…outer surface

[0080] 7, 7a, 7b, 7c, 7d… camera modules

[0081] 71…Driver

[0082] 72…Electronic photosensitive element

[0083] 73…Image Stabilization Module

[0084] 8… Electronic devices

[0085] 81…Flash Module

[0086] 82…Focus Assist Module

[0087] 83…Image Signal Processor

[0088] 84…User Interface

[0089] 85…Image Software Processor

[0090] 86…Subject

[0091] LB1, LB2, LB3, LB4... sunshades

[0092] LB11, LB21, LB31, LB41… First sunshade

[0093] LB12, LB22, LB32, LB42… Second sunshade

[0094] LB13, LB23, LB33, LB43… Third sunshade

[0095] LB14, LB24, LB34, LB44… Fourth sunshade

[0096] LB15, LB25, LB35, LB45… Fifth sunshade

[0097] LB16, LB26, LB36, LB46… Sixth sunshade

[0098] SP1, SP2, SP3, SP4… spacer rings

[0099] SP11, SP21, SP31, SP41… First spacer ring

[0100] SP12, SP22, SP32, SP42… Second spacer ring

[0101] RT…fixed ring

[0102] AA, BB, CC, DD, EE, FF, GG, HH, II, JJ, KK, LL, MM, NN, OO, PP, QQ, RR, SS... area

[0103] The length of the outer surface of the LA light-absorbing coating in solid contact with the sidewall of the lens barrel in a direction substantially parallel to the optical axis.

[0104] LT… The length of the inner surface of the light-absorbing coating along a direction substantially parallel to the optical axis.

[0105] dA1…Minimum thickness of the light-absorbing coating on one side of the outer diameter surface of the plastic optical lens element.

[0106] dA2… The maximum thickness of the light-absorbing coating on one side of the outer diameter surface of the plastic optical lens element.

[0107] ΔdA…the difference between the maximum thickness dA2 and the minimum thickness dA1

[0108] dC… The thickness of the light-absorbing coating on one side of the object-side or image-side surface of a plastic optical lens element. Detailed Implementation

[0109] The following detailed description of the features and advantages of the present invention in the embodiments is sufficient to enable anyone skilled in the art to understand the technical content of the present invention and implement it accordingly. Based on the content, scope of protection, and drawings presented in this specification, anyone skilled in the art can easily understand the related objectives and advantages of the present invention. The following embodiments further illustrate the points of the present invention in detail, but are not intended to limit the scope of the present invention in any way.

[0110] This invention provides an imaging lens having an object side, an image side, an imaging plane, and an optical axis. The image side is relative to the object side, meaning the position of the image side is opposite to the position of the object side. The imaging plane is located on the side closer to the image side and farther from the object side, and the imaging lens images onto the imaging plane. The optical axis passes through the object side, the image side, and the imaging plane. The imaging lens includes a plastic optical lens element, a lens barrel, and a light-absorbing coating.

[0111] A plastic optical lens element has an object-side surface, an image-side surface, and an outer diameter surface. The object-side surface faces the object side of the imaging lens. The image-side surface faces the image side of the imaging lens, and the image-side surface is relative to the object-side surface, meaning the position of the image-side surface is opposite to the position of the object-side surface. The outer diameter surface connects the object-side surface and the image-side surface.

[0112] A plastic optical lens element may include at least one axial connection structure. The axial connection structure is located on at least one of the object-side surface and the image-side surface. The axial connection structure is used to connect adjacent optical elements, and the axial connection structure abuts against the optical element with a tapered surface or engages with a corresponding concave-convex structure of the optical element to align the optical element with the optical axis. This satisfies the coaxiality requirements of the imaging lens, reducing assembly tolerances and improving the assembly yield. The optical elements may be, for example, lenses, light shields, apertures, stops, spacers, and retaining rings, etc., but the invention is not limited thereto. Please refer to... Figure 8 The diagram illustrates axial connection structures 214a, 214b, and 214c according to a second embodiment of the present invention. Please refer to... Figure 24 and Figure 25 The diagram illustrates an axial connection structure 514a according to a fifth embodiment of the present invention.

[0113] The plastic optical lens element may have a reduction surface on the side near the outer diameter surface. The reduction surface connects to the outer diameter surface. The distance between the reduction surface and the optical axis is less than the distance between the outer diameter surface and the optical axis. The plastic optical lens element may include a filler mark on the reduction surface. This ensures that the filler mark does not interfere with the lens barrel, thereby reducing assembly tolerances. Please refer to [reference needed]. Figure 1 The diagram illustrates the reduced surface 115g and the injection mark 116g according to the first embodiment of the present invention. Please refer to... Figure 24 and Figure 27 The diagram illustrates a reduced surface 515a and a filler mark 516a according to a fifth embodiment of the present invention.

[0114] The lens barrel has an internal space. The internal space houses a plastic optical lens element. The lens barrel includes a dish-shaped portion and a sidewall portion. The dish-shaped portion has a light-transmitting aperture, through which the optical axis of the imaging lens passes. The sidewall portion connects to the dish-shaped portion and extends from the dish-shaped portion in a direction substantially parallel to the optical axis. The sidewall portion corresponds to the outer diameter surface of the plastic optical lens element.

[0115] A light-absorbing coating is fixed to the outer diameter surface of the plastic optical lens element and makes solid contact with the lens barrel. The light-absorbing coating can be a black ink-spraying layer formed from a quick-drying ink based on epoxy resin, a blackened coating layer formed by chemical vapor deposition, or a photoresistive coating layer, etc., but this invention is not limited thereto. The light-absorbing coating has an inner surface and an outer surface. The inner surface faces and is fixed to the outer diameter surface of the plastic optical lens element. The outer surface is positioned relative to the inner surface, i.e., its position is opposite to the inner surface, and the outer surface is farther from the outer diameter surface of the plastic optical lens element than the inner surface. The outer surface makes solid contact with the sidewall of the lens barrel.

[0116] The light-absorbing coating extends from the outer diameter surface of the plastic optical lens element to the axial connection structure, and the inner surface of the light-absorbing coating can be fixed to the axial connection structure. By fixing the light-absorbing coating to the axial connection structure, the coating is aligned with and in solid contact with adjacent optical elements. This prevents non-imaging light from escaping through the axial connection structure from the joint between the plastic optical lens element and the optical element, and simultaneously achieves a suitable balance between the overall coaxiality of the imaging lens and the light-shielding requirements of the axial connection structure. Please refer to... Figure 8 The illustration shows a light-absorbing coating 23b extending from the outer diameter surface 213b of the second lens 21b to the axial connection structure 214b according to a second embodiment of the invention.

[0117] The light-absorbing coating can extend from the outer diameter surface of the plastic optical lens element to the object-side and image-side surfaces, and the inner surface of the light-absorbing coating can be fixed to the object-side and image-side surfaces. This extends the light-blocking range of the light-absorbing coating, allowing it to replace adjacent optical elements with the same function, thereby reducing production costs. Please refer to [reference needed]. Figure 8 and Figure 10 The illustration shows a light-absorbing coating 23b extending from the outer diameter surface 213b of the second lens 21b to the object-side surface 211b and the image-side surface 212b, according to a second embodiment of the invention.

[0118] The light-absorbing coating can extend from the outer diameter surface of the plastic optical lens element to one of the object-side and image-side surfaces, and the inner surface of the light-absorbing coating can be fixed to one of the object-side and image-side surfaces. This extends the light-blocking range of the light-absorbing coating to ensure stray light blocking efficiency outside the optically effective area. Please refer to... Figure 5 and Figure 6, showing a light absorption coating 13g extending from the outer diameter surface 113g of the seventh lens 11g to the object side surface 111g in the first embodiment of the present invention. Please refer to Figure 19 And Figure 20 , showing a light absorption coating 43h extending from the outer diameter surface 413h of the eighth lens 41h to the image side surface 412h in the fourth embodiment of the present invention. Please refer to Figure 30 And Figure 31 , showing a light absorption coating 63b extending from the outer diameter surface 613b of the second lens 61b to the image side surface 612b in the sixth embodiment of the present invention.

[0119] The light absorption coating can extend from the outer diameter surface of the plastic optical lens element and can be fixed to at least one of the object side surface and the image side surface, and the outer surface of the light absorption coating fixed to at least one of the object side surface and the image side surface of the plastic optical lens element can be in physical contact with an adjacent optical element. Thereby, the light shielding requirement of the optical design can be satisfied to improve the image clarity.

[0120] The length of the outer surface of the light absorption coating in physical contact with the side wall portion of the lens barrel in a direction substantially parallel to the optical axis is LA, and the length of the inner surface of the light absorption coating in a direction substantially parallel to the optical axis is LT, and they (LA and LT) satisfy the following condition: 0.1 ≤ LA / LT ≤ 0.95. Please refer to Figure 5 , showing the parameters LA and LT in the first embodiment of the present invention.

[0121] By fixing the light absorption coating to the outer diameter surface of the plastic optical lens element, and then making the light absorption coating in physical contact with the side wall portion of the lens barrel, and when LA / LT satisfies the above condition, the intensity of non-imaging light reflected from the outer diameter surface can be reduced to improve the imaging quality. And, during the process of assembling the imaging lens, through the thickness of the physical contact between the light absorption coating and the lens barrel, a gap between the outer diameter surface of the plastic optical lens element and the lens barrel can be provided to match the adjustment margin, so as to improve the assembly qualification rate.

[0122] The minimum thickness of the light absorption coating on the side fixed to the outer diameter surface of the plastic optical lens element is dA1, and the thickness of the light absorption coating on the side fixed to the object side surface or the image side surface of the plastic optical lens element is dC, and they (dA1 and dC) can satisfy the following condition: 0.97 < dA1 / dC ≤ 2.5. Thereby, the proportional range of the thickness of the light absorption coating can be precisely controlled. Please refer to Figure 5 And Figure 6 , showing the parameters dA1 and dC in the first embodiment of the present invention.

[0123] The minimum thickness of the light absorption coating on one side fixed to the outer diameter surface of the plastic optical lens element is dA1, the maximum thickness of the light absorption coating on one side fixed to the outer diameter surface of the plastic optical lens element is dA2, the difference between the maximum thickness dA2 and the minimum thickness dA1 is ΔdA, and the thickness of the light absorption coating on one side fixed to the object-side surface or the image-side surface of the plastic optical lens element is dC. (ΔdA and dC) can satisfy the following condition: 0.03 < ΔdA / dC < 0.79. Thereby, the proportion range of the controllability of the light absorption coating during the manufacturing process can be improved. Please refer to Figure 5 and Figure 6 , which shows the parameters dA1, dA2 and dC in the first embodiment according to the present invention.

[0124] The minimum thickness of the light absorption coating on one side fixed to the outer diameter surface of the plastic optical lens element is dA1, the maximum thickness of the light absorption coating on one side fixed to the outer diameter surface of the plastic optical lens element is dA2, the difference between the maximum thickness dA2 and the minimum thickness dA1 is ΔdA, and it can satisfy the following condition: 0.1 [μm] < ΔdA < dA1. Thereby, the thickness deviation of the light absorption coating during the manufacturing process can be ensured to improve the manufacturing qualification rate.

[0125] The minimum thickness of the light absorption coating on one side fixed to the outer diameter surface of the plastic optical lens element is dA1, the maximum thickness of the light absorption coating on one side fixed to the outer diameter surface of the plastic optical lens element is dA2, the difference between the maximum thickness dA2 and the minimum thickness dA1 is ΔdA, and it can satisfy the following condition: 0.03 < ΔdA / dA1 < 0.99. Thereby, the proportion range of the controllability of the light absorption coating during the manufacturing process can be further improved.

[0126] The imaging lens proposed according to the present invention may further include an auxiliary light absorption coating. The auxiliary light absorption coating has an inner surface and an outer surface. The inner surface of the auxiliary light absorption coating can be fixed to the injection mark, and the outer surface of the auxiliary light absorption coating does not physically contact the lens barrel. Thereby, the light shielding requirement at the position of the injection mark can be satisfied to improve the optical quality. Please refer to Figure 27 and Figure 28 , which shows the auxiliary light absorption coating 54 in the fifth embodiment according to the present invention, wherein the inner surface 541 of the auxiliary light absorption coating 54 is fixed to the injection mark 516a, and the outer surface 542 of the auxiliary light absorption coating 54 does not physically contact the lens barrel 52.

[0127] Each technical feature in the above imaging lens of the present invention can be combined and configured to achieve the corresponding effects.

[0128] According to the above embodiments, specific embodiments are proposed below and will be described in detail with reference to the accompanying drawings.

[0129] <First Embodiment>

[0130] Please refer to Figures 1 to 6 ,in Figure 1 A perspective view of a partially sectional imaging lens according to a first embodiment of the present invention is shown. Figure 2 An exploded view of an imaging lens according to a first embodiment of the present invention is shown. Figure 3 Draw Figure 2 A side-view cross-sectional diagram of the imaging lens. Figure 4 Draw Figure 3 A side view cross-sectional diagram of the seventh lens of the imaging lens. Figure 5 Draw Figure 3 A magnified schematic diagram of the AA region of the imaging lens, and Figure 6 Draw Figure 5 A magnified diagram of the BB region of the imaging lens.

[0131] This embodiment provides an imaging lens 1, having an object side 101, an image side 102, an imaging plane 103, and an optical axis 104. The image side 102 is relative to the object side 101, that is, the position of the image side is opposite to the position of the object side. The imaging plane 103 is located on the side closer to the image side 102 and farther from the object side 101, and the imaging lens 1 images onto the imaging plane 103. The optical axis 104 passes through the object side 101, the image side 102, and the imaging plane 103. The imaging lens 1 includes a plurality of plastic optical lens elements 11, a plurality of light-shielding plates LB1, a plurality of spacer rings SP1, a fixing ring RT, a lens barrel 12, and a light-absorbing coating 13g.

[0132] The plastic optical lens element 11 includes a first lens 11a, a second lens 11b, a third lens 11c, a fourth lens 11d, a fifth lens 11e, a sixth lens 11f, a seventh lens 11g, and an eighth lens 11h. The light-shielding plate LB1 includes a first light-shielding plate LB11, a second light-shielding plate LB12, a third light-shielding plate LB13, a fourth light-shielding plate LB14, a fifth light-shielding plate LB15, and a sixth light-shielding plate LB16. The spacer ring SP1 includes a first spacer ring SP11 and a second spacer ring SP12. The plastic optical lens element 11, the light-shielding plate LB1, the spacer ring SP1, and the fixing ring RT are arranged sequentially from the object side 101 to the image side 102 along a direction parallel to the optical axis 104 as follows: first lens 11a, second lens 11b, first light-shielding plate LB11, third lens 11c, second light-shielding plate LB12, fourth lens 11d, third light-shielding plate LB13, fifth lens 11e, fourth light-shielding plate LB14, sixth lens 11f, first spacer ring SP11, fifth light-shielding plate LB15, seventh lens 11g, second spacer ring SP12, sixth light-shielding plate LB16, eighth lens 11h, and fixing ring RT.

[0133] The seventh lens 11g has an object-side surface 111g, an image-side surface 112g, and an outer diameter surface 113g. The object-side surface 111g faces the object side 101 of the imaging lens 1. The image-side surface 112g faces the image side 102 of the imaging lens 1, and the image-side surface 112g is positioned relative to the object-side surface 111g, that is, the position of the image-side surface 112g is opposite to the position of the object-side surface 111g. The outer diameter surface 113g connects the object-side surface 111g and the image-side surface 112g.

[0134] The seventh lens 11g has a reduction surface 115g on the side near the outer diameter surface 113g. The reduction surface 115g is connected to the outer diameter surface 113g. The distance between the reduction surface 115g and the optical axis 104 is less than the distance between the outer diameter surface 113g and the optical axis 104. The seventh lens 11g also includes a filler mark 116g on the reduction surface 115g.

[0135] The lens barrel 12 has an internal space 121. The internal space 121 accommodates a plastic optical lens element 11, a light shield LB1, a spacer ring SP1, and a retaining ring RT. The lens barrel 12 includes a dish-shaped portion 122 and a sidewall portion 123. The dish-shaped portion 122 is located near the object side 101 of the imaging lens 1. The dish-shaped portion 122 has a light-transmitting aperture 1221, through which the optical axis 104 of the imaging lens 1 passes. The sidewall portion 123 is located near the image side 102 of the imaging lens 1. The sidewall portion 123 connects to the dish-shaped portion 122 and extends from the dish-shaped portion 122 in a direction substantially parallel to the optical axis 104. The sidewall portion 123 has a plurality of stepped surfaces (unlabelled) on the side near the internal space 121, and the plurality of stepped surfaces correspond to the outer diameter surface 113g of the seventh lens 11g and the outer diameter surfaces (unlabelled) of the remaining plastic optical lens elements 11a, 11b, 11c, 11d, 11e, 11f, 11h.

[0136] The light-absorbing coating 13g is fixed to the outer diameter surface 113g of the seventh lens 11g and is in solid contact with the lens barrel 12. The light-absorbing coating 13g has an inner surface 131g and an outer surface 132g. The inner surface 131g faces and is fixed to the outer diameter surface 113g of the seventh lens 11g. The outer surface 132g is positioned opposite the inner surface 131g, and is further away from the outer diameter surface 113g of the seventh lens 11g than the inner surface 131g. The outer surface 132g is in solid contact with the side wall portion 123 of the lens barrel 12.

[0137] The light absorption coating 13g extends from the outer diameter surface 113g of the seventh lens 11g to the object side surface 111g, and the inner surface 131g of the light absorption coating 13g is fixed to the object side surface 111g. The outer surface 132g of the light absorption coating 13g fixed to the object side surface 111g of the seventh lens 11g is in physical contact with the fifth light shield LB15.

[0138] The length of the physical contact between the outer surface 132g of the light absorption coating 13g and the side wall portion 123 of the lens barrel 12 in a direction substantially parallel to the optical axis 104 is LA, and the length of the inner surface 131g of the light absorption coating 13g in a direction substantially parallel to the optical axis 104 on the side fixed to the outer diameter surface 113g of the seventh lens 111g1g is LT, which satisfy the following conditions: LA = 0.36 (mm); LT = 0.49 (mm); and LA / LT = 0.73.

[0139] The minimum thickness of the light absorption coating 13g on the side fixed to the outer diameter surface 113g of the seventh lens 11g is dA1, the maximum thickness of the light absorption coating 13g on the side fixed to the outer diameter surface 113g of the seventh lens 11g is dA2, the difference between the maximum thickness dA2 and the minimum thickness dA1 is ΔdA, and the thickness of the light absorption coating 13g on the side fixed to the object side surface 111g of the seventh lens 11g is dC, which satisfy the following conditions: dA1 = 0.016 (mm); dA2 = 0.017 (mm); ΔdA = 0.001 (mm) = 1 (μm); dC = 0.01 (mm); dA1 / dC = 1.60; ΔdA < dA1; ΔdA / dA1 = 0.06; and ΔdA / dC = 0.10.

[0140] In the description of this embodiment, the light absorption coating 13g is taken as an example of being provided on the seventh lens 11g, but the present invention is not limited thereto. In some embodiments, the light absorption coating may also be provided on other plastic optical lens elements. In the description of this embodiment, the reduced surface 115g and the injection mark 116g of the seventh lens 11g are taken as exemplary descriptions, but the present invention is not limited thereto. In some embodiments, other plastic optical lens elements may also have a reduced surface and an injection mark.

[0141] <Second Embodiment>

[0142] Please refer to Figures 7 to 12 , in which Figure 7 FIG. shows a schematic side cross-sectional view of an imaging lens according to a second embodiment of the present invention, Figure 8 FIG. shows Figure 7 an enlarged schematic view of the CC region of the imaging lens of Figure 9 FIG. shows Figure 8 an enlarged schematic view of the DD region of the imaging lens of Figure 10 FIG. shows Figure 8 A magnified diagram of the EE region of the imaging lens. Figure 11 Draw Figure 8 A magnified schematic diagram of the FF region of the imaging lens, and Figure 12 Draw Figure 8 A magnified schematic diagram of the GG region of the imaging lens.

[0143] This embodiment provides an imaging lens 2, which has an object side 201, an image side 202, an imaging surface 203, and an optical axis 204. The image side 202 is relative to the object side 201, that is, the position of the image side 202 is opposite to the position of the object side 201. The imaging surface 203 is located on the side closer to the image side 202 and farther from the object side 201, and the imaging lens 2 images onto the imaging surface 203. The optical axis 204 passes through the object side 201, the image side 202, and the imaging surface 203. The imaging lens 2 includes a plurality of plastic optical lens elements 21, a plurality of light-shielding plates LB2, a plurality of spacer rings SP2, a fixing ring RT, a lens barrel 22, and a plurality of light-absorbing coatings 23.

[0144] The plastic optical lens element 21 includes a first lens 21a, a second lens 21b, a third lens 21c, a fourth lens 21d, a fifth lens 21e, a sixth lens 21f, a seventh lens 21g, and an eighth lens 21h. The light-shielding plate LB2 includes a first light-shielding plate LB21, a second light-shielding plate LB22, a third light-shielding plate LB23, a fourth light-shielding plate LB24, a fifth light-shielding plate LB25, and a sixth light-shielding plate LB26. The spacer ring SP2 includes a first spacer ring SP21 and a second spacer ring SP22. The plastic optical lens element 21, the light-shielding plate LB2, the spacer ring SP2, and the fixing ring RT are arranged sequentially from the object side 201 to the image side 202 along a direction parallel to the optical axis 204 as follows: first lens 21a, second lens 21b, first light-shielding plate LB21, third lens 21c, second light-shielding plate LB22, fourth lens 21d, third light-shielding plate LB23, fifth lens 21e, fourth light-shielding plate LB24, sixth lens 21f, first spacer ring SP21, fifth light-shielding plate LB25, seventh lens 21g, second spacer ring SP22, sixth light-shielding plate LB26, eighth lens 21h, and fixing ring RT.

[0145] The first lens 21a has an object-side surface 211a, an image-side surface 212a, and an outer diameter surface 213a. The object-side surface 211a faces the object side 201 of the imaging lens 2. The image-side surface 212a faces the image side 202 of the imaging lens 2, and the image-side surface 212a is positioned relative to the object-side surface 211a, that is, the position of the image-side surface 212a is opposite to the position of the object-side surface 211a. The outer diameter surface 213a connects the object-side surface 211a and the image-side surface 212a.

[0146] The first lens 21a includes an axial connection structure 214a. The axial connection structure 214a is located on the image-side surface 212a. The axial connection structure 214a is connected to the second lens 21b.

[0147] The second lens 21b has an object-side surface 211b, an image-side surface 212b, and an outer diameter surface 213b. The object-side surface 211b faces the object side 201 of the imaging lens 2. The image-side surface 212b faces the image side 202 of the imaging lens 2, and the image-side surface 212b is positioned relative to the object-side surface 211b, that is, the position of the image-side surface 212b is opposite to the position of the object-side surface 211b. The outer diameter surface 213b connects the object-side surface 211b and the image-side surface 212b.

[0148] The second lens 21b includes two axial connection structures 214b. The two axial connection structures 214b are located on the object-side surface 211b and the image-side surface 212b, respectively. The axial connection structures 214b connect the first lens 21a, the first light-shielding plate LB21, and the third lens 21c. The axial connection structure 214a of the first lens 21a engages with the axial connection structure 214b of the second lens 21b located on the object-side surface 211b, so that the first lens 21a and the second lens 21b are aligned together with the optical axis 204.

[0149] The third lens 21c has an object-side surface 211c, an image-side surface 212c, and an outer diameter surface 213c. The object-side surface 211c faces the object side 201 of the imaging lens 2. The image-side surface 212c faces the image side 202 of the imaging lens 2, and the image-side surface 212c is positioned relative to the object-side surface 211c, that is, the position of the image-side surface 212c is opposite to the position of the object-side surface 211c. The outer diameter surface 213c connects the object-side surface 211c and the image-side surface 212c.

[0150] The third lens 21c includes two axial connection structures 214c. The two axial connection structures 214c are located on the object-side surface 211c and the image-side surface 212c, respectively. The axial connection structures 214c connect the first light-shielding plate LB21, the second lens 21b, the second light-shielding plate LB22, and the fourth lens 21d. The axial connection structure 214b of the second lens 21b located on the image-side surface 212b engages with the outer edge of the first light-shielding plate LB21 and the axial connection structure 214c of the third lens 21c located on the object-side surface 211c, so that the second lens 21b, the first light-shielding plate LB21, and the third lens 21c are aligned together with the optical axis 204. The axial connection structure 214c of the third lens 21c located on the image-side surface 212c engages with the outer edge of the second light-shielding plate LB22 and the fourth lens 21d, so that the third lens 21c, the second light-shielding plate LB22, and the fourth lens 21d are aligned together with the optical axis 204.

[0151] The lens barrel 22 has an internal space 221. The internal space 221 accommodates a plastic optical lens element 21, a light shield LB2, a spacer ring SP2, and a retaining ring RT. The lens barrel 22 includes a dish-shaped portion 222 and a sidewall portion 223. The dish-shaped portion 222 is located near the object side 201 of the imaging lens 2. The dish-shaped portion 222 has a light-transmitting aperture 2221, through which the optical axis 204 of the imaging lens 2 passes. The sidewall portion 223 is located near the image side 202 of the imaging lens 2. The sidewall portion 223 connects to the dish-shaped portion 222 and extends from the dish-shaped portion 222 in a direction substantially parallel to the optical axis 204. The sidewall portion 223 has a plurality of stepped surfaces (unlabeled) on the side near the internal space 221, and the plurality of stepped surfaces correspond to the outer diameter surfaces 213a of the first lens 21a, 213b of the second lens 21b, 213c of the third lens 21c, and the outer diameter surfaces (unlabeled) of the remaining plastic optical lens elements 21d, 21e, 21f, 21g, and 21h.

[0152] The multiple light-absorbing coatings 23 include light-absorbing coating 23a, light-absorbing coating 23b and light-absorbing coating 23c.

[0153] The light-absorbing coating 23a is fixed to the outer diameter surface 213a of the first lens 21a and substantially contacts the lens barrel 22. The light-absorbing coating 23a has an inner surface 231a and an outer surface 232a. The inner surface 231a faces and is fixed to the outer diameter surface 213a of the first lens 21a. The outer surface 232a is positioned opposite to the inner surface 231a, and is further away from the outer diameter surface 213a of the first lens 21a than the inner surface 231a. The outer surface 232a substantially contacts the sidewall portion 223 of the lens barrel 22.

[0154] The length of the outer surface 232a of the light-absorbing coating 23a in solid contact with the side wall portion 223 of the lens barrel 22 in a direction substantially parallel to the optical axis 204 is LA. The length of the inner surface 231a of the light-absorbing coating 23a on the side of the outer diameter surface 213a fixed to the first lens 21a in a direction substantially parallel to the optical axis 204 is LT. These lengths satisfy the following conditions: LA = 0.39 (mm); LT = 0.46 (mm); and LA / LT = 0.85.

[0155] The minimum thickness of the light absorption coating 23a on one side fixed to the outer diameter surface 213a of the first lens 21a is dA1, the maximum thickness of the light absorption coating 23a on one side fixed to the outer diameter surface 213a of the first lens 21a is dA2, and the difference between the maximum thickness dA2 and the minimum thickness dA1 is ΔdA, which satisfies the following conditions: dA1 = 0.002 (millimeters); dA2 = 0.003 (millimeters); ΔdA = 0.001 (millimeters) = 1 (micrometer); ΔdA < dA1; and ΔdA / dA1 = 0.50.

[0156] The light absorption coating 23b is fixed to the outer diameter surface 213b of the second lens 21b and is in physical contact with the lens barrel 22. The light absorption coating 23b has an inner surface 231b and an outer surface 232b. The inner surface 231b faces and is fixed to the outer diameter surface 213b of the second lens 21b. The outer surface 232b is relative to the inner surface 231b, that is, the position of the outer surface 232b is opposite to the position of the inner surface 231b, and the outer surface 232b is farther from the outer diameter surface 213b of the second lens 21b than the inner surface 231b. The outer surface 232b is in physical contact with the side wall portion 223 of the lens barrel 22.

[0157] The light absorption coating 23b extends from the outer diameter surface 213b of the second lens 21b to the object side surface 211b, the image side surface 212b, and the axial connection structure 214b located on the object side surface 211b and the image side surface 212b, and the inner surface 231b of the light absorption coating 23b is fixed to the object side surface 211b, the image side surface 212b, and the axial connection structure 214b located on the object side surface 211b and the image side surface 212b. The outer surface 232b of the light absorption coating 23b fixed to the object side surface 211b of the second lens 21b is in physical contact with the first lens 21a. The outer surface 232b of the light absorption coating 23b fixed to the image side surface 212b of the second lens 21b is in physical contact with the first light shield LB21 and the third lens 21c.

[0158] The length of the physical contact between the outer surface 232b of the light absorption coating 23b and the side wall portion 223 of the lens barrel 22 in a direction substantially parallel to the optical axis 204 is LA, and the length of the inner surface 231b of the light absorption coating 23b on one side fixed to the outer diameter surface 213b of the second lens 21b in a direction substantially parallel to the optical axis 204 is LT, which satisfies the following conditions: LA = 0.35 (millimeters); LT = 0.43 (millimeters); and LA / LT = 0.8l.

[0159] The minimum thickness of the light absorption coating 23b on the side fixed to the outer diameter surface 213b of the second lens 21b is dA1, the maximum thickness of the light absorption coating 23b on the side fixed to the outer diameter surface 213b of the second lens 21b is dA2, the difference between the maximum thickness dA2 and the minimum thickness dA1 is ΔdA, and the thickness of the light absorption coating 23b on the side fixed to the object side surface 211b or the image side surface 212b of the second lens 21b is dC, which satisfies the following conditions: dA1 = 0.021 (millimeters); dA2 = 0.022 (millimeters); ΔdA = 0.001 (millimeters) = 1 (micrometer); dC = 0.02 or 0.01 (millimeters); dA1 / dC = 1.05 or 2.1; ΔdA < dA1; ΔdA / dA1 = 0.05; and ΔdA / dC = 0.05 or 0.10.

[0160] The light absorption coating 23c is fixed to the outer diameter surface 213c of the third lens 21c and is in physical contact with the lens barrel 22. The light absorption coating 23c has an inner surface 231c and an outer surface 232c. The inner surface 231c faces and is fixed to the outer diameter surface 213c of the third lens 21c. The outer surface 232c is relative to the inner surface 231c, that is, the position of the outer surface 232c is opposite to the position of the inner surface 231c, and the outer surface 232c is farther from the outer diameter surface 213c of the third lens 21c than the inner surface 231c. The outer surface 232c is in physical contact with the side wall portion 223 of the lens barrel 22.

[0161] The length of the physical contact between the outer surface 232c of the light absorption coating 23c and the side wall portion 223 of the lens barrel 22 along a direction substantially parallel to the optical axis 204 is LA, and the length of the inner surface 231c of the light absorption coating 23c on the side fixed to the outer diameter surface 213c of the third lens 21c along a direction substantially parallel to the optical axis 204 is LT, which satisfies the following conditions: LA = 0.37 (millimeters); LT = 0.44 (millimeters); and LA / LT = 0.84.

[0162] The minimum thickness of the light absorption coating 23c on the side fixed to the outer diameter surface 213c of the third lens 21c is dA1, the maximum thickness of the light absorption coating 23c on the side fixed to the outer diameter surface 213c of the third lens 21c is dA2, the difference between the maximum thickness dA2 and the minimum thickness dA1 is ΔdA, which satisfies the following conditions: dA1 = 0.005 (millimeters); dA2 = 0.006 (millimeters); ΔdA = 0.001 (millimeters) = 1 (micrometer); ΔdA < dA1; and ΔdA / dA1 = 0.20.

[0163] In this embodiment, the light-absorbing coatings 23a, 23b, and 23c are exemplified by being disposed on the first lens 21a, the second lens 21b, and the third lens 21c, but the present invention is not limited thereto. In some embodiments, the light-absorbing coatings may also be disposed on other plastic optical lens elements.

[0164] <Third Embodiment>

[0165] Please refer to Figures 13 to 17 ,in Figure 13 A side cross-sectional schematic diagram of an imaging lens according to a third embodiment of the present invention is shown. Figure 14 Draw Figure 13 A magnified schematic diagram of the HH region of the imaging lens. Figure 15 Draw Figure 14 A magnified schematic diagram of region II of the imaging lens. Figure 16 Draw Figure 14 A magnified schematic diagram of the JJ region of the imaging lens, and Figure 17 Draw Figure 14 A magnified schematic diagram of the KK region of the imaging lens.

[0166] This embodiment provides an imaging lens 3, which has an object side 301, an image side 302, an imaging surface 303, and an optical axis 304. The image side 302 is relative to the object side 301, that is, the position of the image side 302 is opposite to the position of the object side 301. The imaging surface 303 is located on the side closer to the image side 302 and farther from the object side 301, and the imaging lens 3 images onto the imaging surface 303. The optical axis 304 passes through the object side 301, the image side 302, and the imaging surface 303. The imaging lens 3 includes a plurality of plastic optical lens elements 31, a plurality of light-shielding plates LB3, a plurality of spacer rings SP3, a fixing ring RT, a lens barrel 32, and a plurality of light-absorbing coatings 33.

[0167] The plastic optical lens element 31 includes a first lens 31a, a second lens 31b, a third lens 31c, a fourth lens 31d, a fifth lens 31e, a sixth lens 31f, a seventh lens 31g, and an eighth lens 31h. The light-shielding plate LB3 includes a first light-shielding plate LB31, a second light-shielding plate LB32, a third light-shielding plate LB33, a fourth light-shielding plate LB34, a fifth light-shielding plate LB35, and a sixth light-shielding plate LB36. The spacer ring SP3 includes a first spacer ring SP31 and a second spacer ring SP32. The plastic optical lens element 31, the light-shielding plate LB3, the spacer ring SP3, and the fixing ring RT are arranged sequentially from the object side 301 to the image side 302 along a direction parallel to the optical axis 304 as follows: first lens 31a, second lens 31b, first light-shielding plate LB31, third lens 31c, second light-shielding plate LB32, fourth lens 31d, third light-shielding plate LB33, fifth lens 31e, fourth light-shielding plate LB34, sixth lens 31f, first spacer ring SP31, fifth light-shielding plate LB35, seventh lens 31g, second spacer ring SP32, sixth light-shielding plate LB36, eighth lens 31h, and fixing ring RT.

[0168] The fourth lens 31d has an object-side surface 311d, an image-side surface 312d, and an outer diameter surface 313d. The object-side surface 311d faces the object side 301 of the imaging lens 3. The image-side surface 312d faces the image side 302 of the imaging lens 3, and the image-side surface 312d is positioned relative to the object-side surface 311d, that is, the position of the image-side surface 312d is opposite to the position of the object-side surface 311d. The outer diameter surface 313d connects the object-side surface 311d and the image-side surface 312d.

[0169] The fifth lens 31e has an object-side surface 311e, an image-side surface 312e, and an outer diameter surface 313e. The object-side surface 311e faces the object side 301 of the imaging lens 3. The image-side surface 312e faces the image side 302 of the imaging lens 3, and the image-side surface 312e is positioned relative to the object-side surface 311e, that is, the position of the image-side surface 312e is opposite to the position of the object-side surface 311e. The outer diameter surface 313e connects the object-side surface 311e and the image-side surface 312e.

[0170] The sixth lens 31f has an object-side surface 311f, an image-side surface 312f, and an outer diameter surface 313f. The object-side surface 311f faces the object side 301 of the imaging lens 3. The image-side surface 312f faces the image side 302 of the imaging lens 3, and the image-side surface 312f is positioned relative to the object-side surface 311f, that is, the position of the image-side surface 312f is opposite to the position of the object-side surface 311f. The outer diameter surface 313f connects the object-side surface 311f and the image-side surface 312f.

[0171] The lens barrel 32 has an internal space 321. The internal space 321 accommodates a plastic optical lens element 31, a light shield LB3, a spacer ring SP3, and a retaining ring RT. The lens barrel 32 includes a dish-shaped portion 322 and a sidewall portion 323. The dish-shaped portion 322 is located near the object side 301 of the imaging lens 3. The dish-shaped portion 322 has a light-transmitting aperture 3221, and the optical axis 304 of the imaging lens 3 passes through the light-transmitting aperture 3221. The sidewall portion 323 is located near the image side 302 of the imaging lens 3. The sidewall portion 323 connects to the dish-shaped portion 322 and extends from the dish-shaped portion 322 in a direction substantially parallel to the optical axis 304. The sidewall portion 323 has a plurality of stepped surfaces (unlabelled) on the side near the internal space 321, and the plurality of stepped surfaces correspond to the outer diameter surfaces 313d of the fourth lens 31d, 313e of the fifth lens 31e, 313f of the sixth lens 31f, and the outer diameter surfaces (unlabelled) of the remaining plastic optical lens elements 31a, 31b, 31c, 31g, and 31h.

[0172] The multiple light-absorbing coatings 33 include light-absorbing coating 33d, light-absorbing coating 33e, and light-absorbing coating 33f.

[0173] The light-absorbing coating 33d is fixed to the outer diameter surface 313d of the fourth lens 31d and substantially contacts the lens barrel 32. The light-absorbing coating 33d has an inner surface 331d and an outer surface 332d. The inner surface 331d faces and is fixed to the outer diameter surface 313d of the fourth lens 31d. The outer surface 332d is positioned relative to the inner surface 331d, that is, the outer surface 332d is positioned opposite to the inner surface 331d, and the outer surface 332d is farther away from the outer diameter surface 313d of the fourth lens 31d than the inner surface 331d. The outer surface 332d substantially contacts the side wall portion 323 of the lens barrel 32.

[0174] The length of the outer surface 332d of the light-absorbing coating 33d in solid contact with the side wall portion 323 of the lens barrel 32 along a direction substantially parallel to the optical axis 304 is LA. The length of the inner surface 331d of the light-absorbing coating 33d along a direction substantially parallel to the optical axis 304 on one side of the outer diameter surface 313d fixed to the fourth lens 31d is LT. These lengths satisfy the following conditions: LA = 0.37 (mm); LT = 0.48 (mm); and LA / LT = 0.77.

[0175] The minimum thickness of the light absorption coating 33d on one side fixed to the outer diameter surface 313d of the fourth lens 31d is dA1, the maximum thickness of the light absorption coating 33d on one side fixed to the outer diameter surface 313d of the fourth lens 31d is dA2, and the difference between the maximum thickness dA2 and the minimum thickness dA1 is ΔdA, which satisfies the following conditions: dA1 = 0.007 (mm); dA2 = 0.008 (mm); ΔdA = 0.001 (mm) = 1 (μm); ΔdA < dA1; and ΔdA / dA1 = 0.14.

[0176] The light absorption coating 33e is fixed to the outer diameter surface 313e of the fifth lens 31e and is in physical contact with the lens barrel 32. The light absorption coating 33e has an inner surface 331e and an outer surface 332e. The inner surface 331e faces and is fixed to the outer diameter surface 313e of the fifth lens 31e. The outer surface 332e is relative to the inner surface 331e, that is, the position of the outer surface 332e is opposite to the position of the inner surface 331e, and the outer surface 332e is farther from the outer diameter surface 313e of the fifth lens 31e than the inner surface 331e. The outer surface 332e is in physical contact with the side wall portion 323 of the lens barrel 32.

[0177] The length of the physical contact between the outer surface 332e of the light absorption coating 33e and the side wall portion 323 of the lens barrel 32 along a direction substantially parallel to the optical axis 304 is LA, and the length of the inner surface 331e of the light absorption coating 33e on one side fixed to the outer diameter surface 313e of the fifth lens 31e along a direction substantially parallel to the optical axis 304 is LT, which satisfies the following conditions: LA = 0.36 (mm); LT = 0.43 (mm); and LA / LT = 0.84.

[0178] The minimum thickness of the light absorption coating 33e on one side fixed to the outer diameter surface 313e of the fifth lens 31e is dA1, the maximum thickness of the light absorption coating 33e on one side fixed to the outer diameter surface 313e of the fifth lens 31e is dA2, and the difference between the maximum thickness dA2 and the minimum thickness dA1 is ΔdA, which satisfies the following conditions: dA1 = 0.009 (mm); dA2 = 0.01 (mm); ΔdA = 0.001 (mm) = 1 (μm); ΔdA < dA1; and ΔdA / dA1 = 0.11.

[0179] The light absorption coating 33f is fixed to the outer diameter surface 313f of the sixth lens 31f and is in physical contact with the lens barrel 32. The light absorption coating 33f has an inner surface 331f and an outer surface 332f. The inner surface 331f faces and is fixed to the outer diameter surface 313f of the sixth lens 31f. The outer surface 332f is relative to the inner surface 331f, that is, the position of the outer surface 332f is opposite to the position of the inner surface 331f, and the outer surface 332f is farther from the outer diameter surface 313f of the sixth lens 31f than the inner surface 331f. The outer surface 332f is in physical contact with the side wall portion 323 of the lens barrel 32.

[0180] The length of the physical contact between the outer surface 332f of the light absorption coating 33f and the side wall portion 323 of the lens barrel 32 along a direction substantially parallel to the optical axis 304 is LA, and the length of the inner surface 331f of the light absorption coating 33f along a direction substantially parallel to the optical axis 304 on the side fixed to the outer diameter surface 313f of the sixth lens 31f is LT, which satisfy the following conditions: LA = 0.13 (mm); LT = 0.27 (mm); and LA / LT = 0.48.

[0181] The minimum thickness of the light absorption coating 33f on the side fixed to the outer diameter surface 313f of the sixth lens 31f is dA1, the maximum thickness of the light absorption coating 33f on the side fixed to the outer diameter surface 313f of the sixth lens 31f is dA2, and the difference between the maximum thickness dA2 and the minimum thickness dA1 is ΔdA, which satisfy the following conditions: dA1 = 0.011 (mm); dA2 = 0.012 (mm); ΔdA = 0.001 (mm) = 1 (μm); ΔdA < dA1; and ΔdA / dA1 = 0.09.

[0182] In the description of this embodiment, the light absorption coatings 33d, 33e, 33f are taken as examples of being provided on the fourth lens 31d, the fifth lens 31e, and the sixth lens 31f, but the present invention is not limited thereto. In some embodiments, the light absorption coating may also be provided on other plastic optical lens elements.

[0183] <Fourth Embodiment>

[0184] Please refer to Figures 18 to 20 where Figure 18 FIG. shows a schematic side cross-sectional view of an imaging lens according to a fourth embodiment of the present invention, Figure 19 FIG. shows Figure 18 an enlarged schematic view of the LL region of the imaging lens of Figure 20 FIG., and Figure 19 ​​​This embodiment provides an imaging lens 4, which has an object side 401, an image side 402, an imaging surface 403, and an optical axis 404. The image side 402 is relative to the object side 401, that is, the position of the image side 402 is opposite to the position of the object side 401. The imaging surface 403 is located on the side closer to the image side 402 and farther from the object side 401, and the imaging lens 4 images onto the imaging surface 403. The optical axis 404 passes through the object side 401, the image side 402, and the imaging surface 403. The imaging lens 4 includes a plurality of plastic optical lens elements 41, a plurality of light-shielding plates LB4, a plurality of spacer rings SP4, a fixing ring RT, a lens barrel 42, and a light-absorbing coating 43h.

[0186] The plastic optical lens element 41 includes a first lens 41a, a second lens 41b, a third lens 41c, a fourth lens 41d, a fifth lens 41e, a sixth lens 41f, a seventh lens 41g, and an eighth lens 41h. The light-shielding plate LB4 includes a first light-shielding plate LB41, a second light-shielding plate LB42, a third light-shielding plate LB43, a fourth light-shielding plate LB44, a fifth light-shielding plate LB45, and a sixth light-shielding plate LB46. The spacer ring SP4 includes a first spacer ring SP41 and a second spacer ring SP42. The plastic optical lens element 41, the light-shielding plate LB4, the spacer ring SP4, and the fixing ring RT are arranged sequentially from the object side 401 to the image side 402 along a direction parallel to the optical axis 404 as follows: first lens 41a, second lens 41b, first light-shielding plate LB41, third lens 41c, second light-shielding plate LB42, fourth lens 41d, third light-shielding plate LB43, fifth lens 41e, fourth light-shielding plate LB44, sixth lens 41f, first spacer ring SP41, fifth light-shielding plate LB45, seventh lens 41g, second spacer ring SP42, sixth light-shielding plate LB46, eighth lens 41h, and fixing ring RT.

[0187] The eighth lens 41h has an object-side surface 411h, an image-side surface 412h, and an outer diameter surface 413h. The object-side surface 411h faces the object side 401 of the imaging lens 4. The image-side surface 412h faces the image side 402 of the imaging lens 4, and the position of the image-side surface 412h is opposite to that of the object-side surface 411h. The outer diameter surface 413h connects the object-side surface 411h and the image-side surface 412h.

[0188] The lens barrel 42 has an internal space 421. The internal space 421 accommodates a plastic optical lens element 41, a light shield LB4, a spacer ring SP4, and a retaining ring RT. The lens barrel 42 includes a dish-shaped portion 422 and a sidewall portion 423. The dish-shaped portion 422 is located near the object side 401 of the imaging lens 4. The dish-shaped portion 422 has a light-transmitting aperture 4221, through which the optical axis 404 of the imaging lens 4 passes. The sidewall portion 423 is located near the image side 402 of the imaging lens 4. The sidewall portion 423 connects to the dish-shaped portion 422 and extends from the dish-shaped portion 422 in a direction substantially parallel to the optical axis 404. The sidewall portion 423 has a plurality of stepped surfaces (unlabelled) on the side near the internal space 421, and the plurality of stepped surfaces correspond to the outer diameter surface 413h of the eighth lens 41h and the outer diameter surfaces (unlabelled) of the remaining plastic optical lens elements 41a, 41b, 41c, 41d, 41e, 41f, 41g.

[0189] The light-absorbing coating 43h is fixed to the outer diameter surface 413h of the eighth lens 41h and is in solid contact with the lens barrel 42. The light-absorbing coating 43h has an inner surface 431h and an outer surface 432h. The inner surface 431h faces and is fixed to the outer diameter surface 413h of the eighth lens 41h. The outer surface 432h is positioned opposite to the inner surface 431h, and is further away from the outer diameter surface 413h of the eighth lens 41h than the inner surface 431h. The outer surface 432h is in solid contact with the sidewall portion 423 of the lens barrel 42.

[0190] The light-absorbing coating 43h extends from the outer diameter surface 413h of the eighth lens 41h to the image-side surface 412h, and the inner surface 431h of the light-absorbing coating 43h is fixed to the image-side surface 412h. The outer surface 432h of the light-absorbing coating 43h, which is fixed to the image-side surface 412h of the eighth lens 41h, is in solid contact with the retaining ring RT.

[0191] The length of the outer surface 432h of the light-absorbing coating 43h in solid contact with the side wall portion 423 of the lens barrel 42 along a direction substantially parallel to the optical axis 404 is LA. The length of the inner surface 431h of the light-absorbing coating 43h along a direction substantially parallel to the optical axis 404 on one side of the outer diameter surface 413h fixed to the eighth lens 41h is LT. These lengths satisfy the following conditions: LA = 0.44 (mm); LT = 0.52 (mm); and LA / LT = 0.85.

[0192] The minimum thickness of the light absorption coating 43h on one side fixed to the outer diameter surface 413h of the eighth lens 41h is dA1, the maximum thickness of the light absorption coating 43h on one side fixed to the outer diameter surface 413h of the eighth lens 41h is dA2, the difference between the maximum thickness dA2 and the minimum thickness dA1 is ΔdA, and the thickness of the light absorption coating 43h on one side of the image side surface 412h of the eighth lens 41h is dC, which satisfies the following conditions: dA1 = 0.009 (mm); dA2 = 0.01 (mm); ΔdA = 0.001 (mm) = 1 (μm); dC = 0.01 (mm); dA1 / dC = 0.90; ΔdA < dA1; ΔdA / dA1 = 0.11; and ΔdA / dC = 0.10.

[0193] In the description of this embodiment, the light absorption coating 43h is taken as an example of being provided on the eighth lens 41h, but the present invention is not limited thereto. In some embodiments, the light absorption coating may also be provided on other plastic optical lens elements.

[0194] <The Fifth Embodiment>

[0195] Please refer to Figures 21 to 28 , where Figure 21 shows a three-dimensional schematic diagram of an imaging lens according to the fifth embodiment of the present invention, Figure 22 shows a three-dimensional schematic diagram of a sectioned imaging lens according to the fifth embodiment of the present invention, Figure 23 shows Figure 22 a side view cross-sectional schematic diagram of the imaging lens of Figure 24 shows Figure 23 a side view cross-sectional schematic diagram of the first lens of the imaging lens of Figure 25 shows Figure 23 an enlarged schematic diagram of the NN region of the imaging lens of Figure 26 shows Figure 25 an enlarged schematic diagram of the OO region of the imaging lens of Figure 27 shows Figure 23 an enlarged schematic diagram of the PP region of the imaging lens of, and Figure 28 shows Figure 27 an enlarged schematic diagram of the QQ region of the imaging lens of.

[0196] This embodiment provides an imaging lens 5, which has an object side 501, an image side 502, an imaging surface 503, and an optical axis 504. The image side 502 is relative to the object side 501, that is, the position of the image side 502 is opposite to the position of the object side 501. The imaging surface 503 is located on the side closer to the image side 502 and farther from the object side 501, and the imaging lens 5 images onto the imaging surface 503. The optical axis 504 passes through the object side 501, the image side 502, and the imaging surface 503. The imaging lens 5 includes a retaining ring RT, a plurality of plastic optical lens elements 51, a lens barrel 52, and a light-absorbing coating 53a.

[0197] The plastic optical lens element 51 includes a first lens 51a, a second lens 51b, and a third lens 51c. The retaining ring RT and the plastic optical lens element 51 are arranged sequentially from the object side 501 to the image side 502 along a direction parallel to the optical axis 504 as the retaining ring RT, the first lens 51a, the second lens 51b, and the third lens 51c.

[0198] The first lens 51a has an object-side surface 511a, an image-side surface 512a, and an outer diameter surface 513a. The object-side surface 511a faces the object side 501 of the imaging lens 5. The image-side surface 512a faces the image side 502 of the imaging lens 5, and the image-side surface 512a is positioned relative to the object-side surface 511a, that is, the position of the image-side surface 512a is opposite to the position of the object-side surface 511a. The outer diameter surface 513a connects the object-side surface 511a and the image-side surface 512a.

[0199] The first lens 51a includes an axial connection structure 514a. The axial connection structure 514a is located on the image-side surface 512a. The axial connection structure 514a connects to the second lens 51b. The axial connection structure 514a engages with the second lens 51b to align the first lens 51a and the second lens 51b together with the optical axis 504.

[0200] The first lens 51a has a reduction surface 515a on the side near the outer diameter surface 513a. The reduction surface 515a is connected to the outer diameter surface 513a. The distance between the reduction surface 515a and the optical axis 504 is less than the distance between the outer diameter surface 513a and the optical axis 504. The first lens 51a also includes a filler mark 516a on the reduction surface 515a.

[0201] The lens barrel 52 has an internal space 521. The internal space 521 houses the plastic optical lens element 51 and the fixing ring RT. The lens barrel 52 includes a disc-shaped portion 522 and a side wall portion 523. The disc-shaped portion 522 is close to the object side 501 of the imaging lens 5. The disc-shaped portion 522 has a light passing hole 5221, and the optical axis 504 of the imaging lens 5 passes through the light passing hole 5221. The side wall portion 523 is close to the image side 502 of the imaging lens 5. The side wall portion 523 is connected to the disc-shaped portion 522, and the side wall portion 523 extends from the disc-shaped portion 522 in a direction substantially parallel to the optical axis 504. The side wall portion 523 has a plurality of stepped surfaces (not labeled separately) on the side close to the internal space 521, and the plurality of stepped surfaces correspond to the outer diameter surface 513a of the first lens 51a and the outer diameter surfaces (not labeled separately) of the remaining plastic optical lens elements 51b, 51c.

[0202] The light absorption coating 53a is fixed to the outer diameter surface 513a of the first lens 51a and is in physical contact with the lens barrel 52. The light absorption coating 53a has an inner surface 531a and an outer surface 532a. The inner surface 531a faces and is fixed to the outer diameter surface 513a of the first lens 51a. The outer surface 532a is relative to the inner surface 531a, that is, the position of the outer surface 532a is opposite to the position of the inner surface 531a, and the outer surface 532a is farther from the outer diameter surface 513a of the first lens 51a than the inner surface 531a. The outer surface 532a is in physical contact with the side wall portion 523 of the lens barrel 52.

[0203] The length of the physical contact between the outer surface 532a of the light absorption coating 53a and the side wall portion 523 of the lens barrel 52 in a direction substantially parallel to the optical axis 504 is LA, and the length of the inner surface 531a of the light absorption coating 53a on the side fixed to the outer diameter surface 513a of the first lens 51a in a direction substantially parallel to the optical axis 504 is LT, which satisfy the following conditions: LA = 0.27 (mm); LT = 0.31 (mm); and LA / LT = 0.87.

[0204] The minimum thickness of the light absorption coating 53a on the side fixed to the outer diameter surface 513a of the first lens 51a is dA1, the maximum thickness of the light absorption coating 53a on the side fixed to the outer diameter surface 513a of the first lens 51a is dA2, and the difference between the maximum thickness dA2 and the minimum thickness dA1 is ΔdA, which satisfy the following conditions: dA1 = 0.009 (mm); dA2 = 0.01 (mm); ΔdA = 0.001 (mm) = 1 (μm); ΔdA < dA1; and ΔdA / dA1 = 0.11.

[0205] The imaging lens 5 also includes an auxiliary light-absorbing coating 54. The auxiliary light-absorbing coating 54 has an inner surface 541 and an outer surface 542. The inner surface 541 of the auxiliary light-absorbing coating 54 is fixed to the injection mark 516a, and the outer surface 542 of the auxiliary light-absorbing coating 54 does not physically contact the lens barrel 52. Furthermore, the auxiliary light-absorbing coating 54 and the light-absorbing coating 53a can be connected to each other and can be manufactured together in the same process.

[0206] In this embodiment, the light-absorbing coating 53a is exemplified by its application to the first lens 51a, but the invention is not limited thereto. In some embodiments, the light-absorbing coating may also be applied to other plastic optical lens elements. In this embodiment, the reduction surface 515a and the injection mark 516a of the first lens 51a are used as examples, but the invention is not limited thereto. In some embodiments, other plastic optical lens elements may also have a reduction surface and an injection mark.

[0207] <Sixth Embodiment>

[0208] Please refer to Figures 29 to 31 ,in Figure 29 A side cross-sectional schematic diagram of an imaging lens according to a sixth embodiment of the present invention is shown. Figure 30 Draw Figure 29 A magnified schematic diagram of the RR region of the imaging lens, and Figure 31 Draw Figure 30 A magnified schematic diagram of the SS region of the imaging lens.

[0209] This embodiment provides an imaging lens 6, which has an object side 601, an image side 602, an imaging surface 603, and an optical axis 604. The image side 602 is relative to the object side 601, that is, the position of the image side 602 is opposite to the position of the object side 601. The imaging surface 603 is located on the side closer to the image side 602 and farther away from the object side 601, and the imaging lens 6 images onto the imaging surface 603. The optical axis 604 passes through the object side 601, the image side 602, and the imaging surface 603. The imaging lens 6 includes a retaining ring RT, a plurality of plastic optical lens elements 61, a lens barrel 62, and a light-absorbing coating 63b.

[0210] The plastic optical lens element 61 includes a first lens 61a, a second lens 61b, and a third lens 61c. The retaining ring RT and the plastic optical lens element 61 are arranged sequentially from the object side 601 to the image side 602 along a direction parallel to the optical axis 604 as the retaining ring RT, the first lens 61a, the second lens 61b, and the third lens 61c.

[0211] The second lens 61b has an object-side surface 611b, an image-side surface 612b, and an outer diameter surface 613b. The object-side surface 611b faces the object side 601 of the imaging lens 6. The image-side surface 612b faces the image side 602 of the imaging lens 6, and the position of the image-side surface 612b relative to the object-side surface 611b is opposite to that of the object-side surface 611b. The outer diameter surface 613b connects the object-side surface 611b and the image-side surface 612b.

[0212] The lens barrel 62 has an internal space 621. The internal space 621 accommodates the plastic optical lens element 61 and the retaining ring RT. The lens barrel 62 includes a dish-shaped portion 622 and a sidewall portion 623. The dish-shaped portion 622 is close to the object side 601 of the imaging lens 6. The dish-shaped portion 622 has a light-transmitting aperture 6221, and the optical axis 604 of the imaging lens 6 passes through the light-transmitting aperture 6221. The sidewall portion 623 is close to the image side 602 of the imaging lens 6. The sidewall portion 623 is connected to the dish-shaped portion 622 and extends from the dish-shaped portion 622 in a direction substantially parallel to the optical axis 604. The sidewall portion 623 has a plurality of step surfaces (not otherwise labeled) on the side close to the internal space 621, and the plurality of step surfaces correspond to the outer diameter surface 613b of the second lens 61b and the outer diameter surfaces (not otherwise labeled) of the other plastic optical lens elements 61a and 61c.

[0213] The light-absorbing coating 63b is fixed to the outer diameter surface 613b of the second lens 61b and substantially contacts the lens barrel 62. The light-absorbing coating 63b has an inner surface 631b and an outer surface 632b. The inner surface 631b faces and is fixed to the outer diameter surface 613b of the second lens 61b. The outer surface 632b is positioned relative to the inner surface 631b, that is, the outer surface 632b is positioned opposite to the inner surface 631b, and the outer surface 632b is farther away from the outer diameter surface 613b of the second lens 61b than the inner surface 631b. The outer surface 632b substantially contacts the side wall portion 623 of the lens barrel 62.

[0214] The light-absorbing coating 63b extends from the outer diameter surface 613b of the second lens 61b to the image-side surface 612b, and the inner surface 631b of the light-absorbing coating 63b is fixed to the image-side surface 612b. The outer surface 632b of the light-absorbing coating 63b, which is fixed to the image-side surface 612b of the second lens 61b, is in solid contact with the third lens 61c.

[0215] The length of the outer surface 632b of the light absorption coating 63b in substantial contact with the side wall portion 623 of the lens barrel 62 in a direction substantially parallel to the optical axis 604 is LA, and the length of the inner surface 631b of the light absorption coating 63b in a direction substantially parallel to the optical axis 604 on the side fixed to the outer diameter surface 613b of the second lens 61b is LT, which satisfy the following conditions: LA = 1.23 (mm); LT = 1.87 (mm); and LA / LT = 0.66.

[0216] The minimum thickness of the light absorption coating 63b on the side fixed to the outer diameter surface 613b of the second lens 61b is dA1, the maximum thickness of the light absorption coating 63b on the side fixed to the outer diameter surface 613b of the second lens 61b is dA2, the difference between the maximum thickness dA2 and the minimum thickness dA1 is ΔdA, and the thickness of the light absorption coating 63b on the side of the image side surface 612b of the second lens 61b is dC, which satisfy the following conditions: dA1 = 0.01 (mm); dA2 = 0.024 (mm); ΔdA = 0.014 (mm) = 14 (μm); dC = 0.03 or 0.02 (mm); dA1 / dC = 0.33 or 0.50; ΔdA < dA1; ΔdA / dA1 = 1.4; and ΔdA / dC = 0.47 or 0.70.

[0217] In the description of this embodiment, the light absorption coating 63b is taken as an example of being provided on the second lens 61b, but the present invention is not limited thereto. In some embodiments, the light absorption coating may also be provided on other plastic optical lens elements.

[0218] <The Seventh Embodiment>

[0219] Please refer to Figure 32 , which shows a three-dimensional schematic diagram of a camera module according to the seventh embodiment of the present invention. In this embodiment, the camera module 7 includes an imaging lens 1, a driving device 71, an electronic photosensitive element 72, and an image stabilization module 73. In addition to the above-mentioned plastic optical lens element 11, light shielding plate LB1, spacer ring SP1, fixing ring RT, lens barrel 12, and light absorption coating 13g, the imaging lens 1 further includes a support device (Holder Member, not shown separately) for carrying the plastic optical lens element 11. The camera module 7 may also be configured with the imaging lenses 2 to 6 of the above other embodiments, and the present invention is not limited thereto. The camera module 7 uses the imaging lens 1 to collect light to generate an image, and cooperates with the driving device 71 to perform image focusing, and finally forms an image on the electronic photosensitive element 72 and can output it as image data.

[0220] The driving device 71 can have an auto-focus function, and its driving method can use a driving system such as a voice coil motor (VCM), microelectromechanical systems (MEMS), piezoelectric systems, and shape memory alloys. The driving device 71 allows the imaging lens 1 to achieve a better imaging position, enabling clear images of the subject at different object distances. In addition, the camera module 7 is equipped with a high-brightness and low-noise electronic image sensor 72 (such as CMOS or CCD) located on the imaging surface 103 of the imaging lens 1, which can truly present the good image quality of the imaging lens 1.

[0221] The image stabilization module 73 can be, for example, an accelerometer, a gyroscope, or a Hall effect sensor. The drive unit 71 can work in conjunction with the image stabilization module 73 to form an optical image stabilization (OIS) device. By adjusting the changes in different axes of the imaging lens 1, it can compensate for the blurry image caused by shaking during shooting, or use image compensation technology in the imaging software to provide electronic image stabilization (EIS) function, further improving the image quality of shooting in dynamic and low-light scenes.

[0222] <Eighth Embodiment>

[0223] Please refer to Figures 33 to 35 ,in Figure 33 A perspective view of one side of an electronic device according to an eighth embodiment of the present invention is shown. Figure 34 Draw Figure 33 A three-dimensional diagram of the other side of the electronic device, and Figure 35 Draw Figure 33 System block diagram of an electronic device.

[0224] In this embodiment, the electronic device 8 is a smartphone. The electronic device 8 includes a camera module 7, camera module 7a, camera module 7b, camera module 7c, camera module 7d, a flash module 81, a focus assist module 82, an image signal processor 83, a user interface 84, and an image software processor 85, as described in the seventh embodiment. Camera modules 7 and 7a are both located on the same side of the electronic device 8 and are both single-focus. Camera modules 7b, 7c, 7d, and the user interface 84 are all located on the other side of the electronic device 8, and the user interface 84 is a display device, allowing camera modules 7b, 7c, and 7d to function as front-facing lenses for selfies; however, this invention is not limited to this. Furthermore, camera modules 7a, 7b, 7c, and 7d may each include the imaging lenses 1 to 6 of this invention and may have a similar structural configuration to camera module 7. In detail, camera modules 7a, 7b, 7c, and 7d may each include an imaging lens, a driving device, an electronic photosensitive element, and an image stabilization module. The imaging lens of each of camera modules 7a, 7b, 7c, and 7d may include, for example, a plastic optical lens element (as described in this invention), a light-shielding plate, a spacer ring, a fixing ring, a lens barrel, a light-absorbing coating, and a support device for supporting the plastic optical lens element.

[0225] Camera module 7 is a wide-angle camera module, camera module 7a is an ultra-wide-angle camera module, camera module 7b is a wide-angle camera module, camera module 7c is an ultra-wide-angle camera module, and camera module 7d is a Time-of-Flight (ToF) camera module. In this embodiment, camera modules 7 and 7a have different viewing angles, allowing the electronic device 8 to provide different magnifications to achieve optical zoom shooting effects. Additionally, camera module 7d can acquire depth information from the image. The above-described electronic device 8 is exemplified by including multiple camera modules 7, 7a, 7b, 7c, and 7d, but the number and configuration of camera modules are not intended to limit the invention.

[0226] When the user takes a picture of the subject 86, the electronic device 8 uses camera module 7 or camera module 7a to focus the light and capture the image, activates flash module 81 for supplemental lighting, and uses the subject distance information of the subject 86 provided by focus assist module 82 for fast focusing. In addition, image signal processor 83 performs image optimization processing to further improve the image quality produced by imaging lens 1. Focus assist module 82 can use an infrared or laser focus assist system to achieve fast focusing. Furthermore, the electronic device 8 can also use camera module 7b, camera module 7c, or camera module 7d for shooting. The user interface 84 can be a touch screen, combined with the diverse functions of image software processor 85 for image shooting and image processing (or can be shot using a physical shooting button). The image processed by image software processor 85 can be displayed on user interface 84.

[0227] The imaging lenses 1-6 of this invention are not limited to application in smartphones. Imaging lenses 1-6 can also be applied to mobile focusing systems as needed, and feature excellent aberration correction and good image quality. For example, imaging lenses 1-6 can be widely used in electronic devices such as 3D image capture, digital cameras, mobile devices, digital drawing tablets, smart TVs, network monitoring equipment, dashcams, reversing cameras, multi-lens devices, recognition systems, motion-sensing game consoles, and wearable devices. The aforementioned electronic devices are merely illustrative examples of practical applications of this invention and do not limit the scope of application of the camera module of this invention.

[0228] Although the present invention has been described above with reference to embodiments, it is not intended to limit the present invention. Any person skilled in the art may make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the appended claims.

Claims

1. An imaging lens, characterized in that, The imaging lens has an object side, an image side, and an optical axis. The image side is positioned opposite to the object side, and the optical axis passes through the object side and the image side. The imaging lens comprises: A plastic optical lens element having: An object-side surface facing the object side of the imaging lens; An image-side surface facing the image side of the imaging lens; and An outer diameter surface connects the object-side surface and the image-side surface; A lens barrel having an internal space accommodating the plastic optical lens element, and the lens barrel comprising: A dish-shaped portion having a light-transmitting aperture, and the optical axis of the imaging lens passing through the light-transmitting aperture; and A sidewall portion, connecting to the disc-shaped portion, and the sidewall portion corresponding to the outer diameter surface of the plastic optical lens element; and A light-absorbing coating is fixed to the outer diameter surface of the plastic optical lens element and substantially contacts the lens barrel, the light-absorbing coating having: An inner surface, facing and fixed to the outer diameter surface of the plastic optical lens element; and An outer surface is positioned opposite to the inner surface, the outer surface being further away from the outer diameter surface of the plastic optical lens element than the inner surface, and the outer surface substantially contacts the sidewall portion of the lens barrel. Wherein, the length of the outer surface of the light-absorbing coating in solid contact with the sidewall portion of the lens barrel along a direction substantially parallel to the optical axis is LA, and the length of the inner surface of the light-absorbing coating along a direction substantially parallel to the optical axis is LT, which satisfies the following condition: 0.1≤LA / LT≤0.

87.

2. The imaging lens as described in claim 1, characterized in that, The plastic optical lens element includes at least one axial connection structure located on at least one of the object-side surface and the image-side surface, and the at least one axial connection structure is used to connect an adjacent optical element and to align the optical element with the optical axis.

3. The imaging lens as described in claim 2, characterized in that, The light-absorbing coating extends from the outer diameter surface of the plastic optical lens element to the at least one axial connection structure, and the inner surface of the light-absorbing coating is fixed to the at least one axial connection structure.

4. The imaging lens as described in claim 1, characterized in that, The light-absorbing coating extends from the outer diameter surface of the plastic optical lens element to the object-side surface and the image-side surface, and the inner surface of the light-absorbing coating is fixed to the object-side surface and the image-side surface.

5. The imaging lens as described in claim 1, characterized in that, The light-absorbing coating extends from the outer diameter surface of the plastic optical lens element to one of the object-side surface and the image-side surface, and the inner surface of the light-absorbing coating is fixed to one of the object-side surface and the image-side surface.

6. The imaging lens as described in claim 1, characterized in that, The light-absorbing coating extends from the outer diameter surface of the plastic optical lens element and is fixed to at least one of the object-side surface and the image-side surface. The minimum thickness of the light-absorbing coating on the side fixed to the outer diameter surface of the plastic optical lens element is dA1, and the thickness of the light-absorbing coating on the side fixed to either the object-side surface or the image-side surface of the plastic optical lens element is dC. This satisfies the following condition: 0.97 <dA1 / dC≤2.5。 7. The imaging lens as described in claim 6, characterized in that, The minimum thickness of the light-absorbing coating on the side fixed to the outer diameter surface of the plastic optical lens element is dA1, the maximum thickness of the light-absorbing coating on the side fixed to the outer diameter surface of the plastic optical lens element is dA2, the difference between the maximum thickness dA2 and the minimum thickness dA1 is ΔdA, and the thickness of the light-absorbing coating on the side fixed to the object-side surface or the image-side surface of the plastic optical lens element is dC, which satisfies the following condition: 0.03 < ΔdA / dC < 0.

79.

8. The imaging lens as described in claim 1, characterized in that, The light-absorbing coating has a minimum thickness of dA1 on one side of the outer diameter surface of the plastic optical lens element, and a maximum thickness of dA2 on the same side. The difference between the maximum thickness dA2 and the minimum thickness dA1 is ΔdA, which satisfies the following condition: 0.1 micrometers < ΔdA <dA1。 9. The imaging lens as described in claim 8, characterized in that, The minimum thickness of the light-absorbing coating on the side fixed to the outer diameter surface of the plastic optical lens element is dA1, and the maximum thickness of the light-absorbing coating on the side fixed to the outer diameter surface of the plastic optical lens element is dA2. The difference between the maximum thickness dA2 and the minimum thickness dA1 is ΔdA, which satisfies the following condition: 0.03 < ΔdA / dA1 < 0.

99.

10. The imaging lens as described in claim 1, characterized in that, The light-absorbing coating extends from the outer diameter surface of the plastic optical lens element and is fixed to at least one of the object-side surface and the image-side surface, and the outer surface of the light-absorbing coating fixed to at least one of the object-side surface and the image-side surface of the plastic optical lens element is in solid contact with an adjacent optical element.

11. The imaging lens as described in claim 1, characterized in that, The plastic optical lens element has a reduction surface on the side near the outer diameter surface, the reduction surface is connected to the outer diameter surface, the distance between the reduction surface and the optical axis is less than the distance between the outer diameter surface and the optical axis, and the plastic optical lens element includes an injection mark on the reduction surface.

12. The imaging lens as described in claim 11, characterized in that, The imaging lens also includes an auxiliary light-absorbing coating, wherein the auxiliary light-absorbing coating has an inner surface and an outer surface, the inner surface of the auxiliary light-absorbing coating is fixed to the injection mark, and the outer surface of the auxiliary light-absorbing coating does not physically contact the lens barrel.

13. A camera module, characterized in that, The camera module includes: The imaging lens as described in claim 1.

14. An electronic device, characterized in that, The electronic device includes: The camera module as described in claim 13; and An electronic photosensitive element is disposed on an imaging surface of the imaging lens.

Images