Imaging lens, imaging device and electronic device

Abstract

The present invention discloses an imaging lens having an optical axis and an imaging surface, and the optical axis passes through the imaging surface. The imaging lens includes a plastic lens barrel, and the plastic lens barrel surrounds the optical axis. The plastic lens barrel includes an image-side portion and an object-side opening, the image-side portion is located between the imaging surface and the object-side opening, and the optical axis passes through the object-side opening. The image-side portion includes a bump structure, and the bump structure is disposed around the optical axis and extends toward the imaging surface. The bump structure has an inner side surface, an outer side surface, and an anti-reflection surface. The inner side surface faces the optical axis. The outer side surface is disposed opposite to the inner side surface, and the outer side surface is farther from the optical axis than the inner side surface. The anti-reflection surface extends in a direction toward the imaging surface, and the anti-reflection surface connects the inner side surface and the outer side surface. The bump structure includes a first anti-reflection structure, and the first anti-reflection structure is disposed on the anti-reflection surface. The present invention also discloses an image capturing device and an electronic device having the above imaging lens.

Description

Technical Field

[0001] The present invention relates to an imaging lens, an image capturing device, and an electronic device, and particularly to an imaging lens and an image capturing device suitable for an electronic device. Background Art

[0002] With the continuous improvement of semiconductor process technology, the performance of electronic photosensitive elements can accommodate more pixels. Therefore, optical lenses with high imaging quality have become an essential part. In addition, with the rapid development of technology, the application scope of electronic devices equipped with optical lenses is more extensive, and the requirements for optical lenses are also more diverse.

[0003] Ideally, the larger the size of the electronic photosensitive element, the more light it can receive and the more pixels it can accommodate, thus expecting better imaging quality. However, in practical applications, the optical lens is limited by its own volume and the load limit of the driver, and the optical lens itself cannot be enlarged correspondingly with the electronic photosensitive element. This leads to a decrease in the relative illumination (RI) in the edge region of the electronic photosensitive element, thereby affecting the imaging quality. Therefore, how to improve the structure of the optical lens has become an important issue in the current optical field. Summary of the Invention

[0004] In view of the above-mentioned problems, the present invention discloses an imaging lens, an image capturing device, and an electronic device, which helps to improve the problem of insufficient relative illumination in the edge region caused by matching a large-sized electronic photosensitive element, so as to obtain an optical lens with good imaging quality.

[0005] The present invention provides an imaging lens having an optical axis and an imaging surface, and the optical axis passes through the imaging surface. The imaging lens includes a plastic lens barrel, and the plastic lens barrel surrounds the optical axis. The plastic lens barrel includes an image-side portion and an object-side opening, the image-side portion is located between the imaging surface and the object-side opening, and the optical axis passes through the object-side opening. The image-side portion includes a plurality of bump structures, and the plurality of bump structures are arranged around the optical axis and extend toward the imaging surface. Each of the bump structures has an inner side surface, an outer side surface, and at least one anti-reflection surface. The inner side surface faces the optical axis. The outer side surface is disposed opposite to the inner side surface, and the outer side surface is farther from the optical axis than the inner side surface. The at least one anti-reflection surface extends in a direction toward the imaging surface, and the at least one anti-reflection surface connects the inner side surface and the outer side surface. Each of the bump structures includes at least one first anti-reflection structure, and the at least one first anti-reflection structure is disposed on the at least one anti-reflection surface.

[0006] The present invention provides an image capturing device including the above-mentioned imaging lens.

[0007] The present invention provides an electronic device, comprising the above imaging device and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on the imaging surface of the imaging lens.

[0008] According to the imaging lens, imaging device, and electronic device disclosed in the present invention, since the plastic lens barrel includes a convex structure at the image side end, and the convex structure has an anti-reflection surface, the relative illuminance can be effectively improved, thereby obtaining good imaging quality. In addition, such a plastic lens barrel structure can further reduce the overall volume and weight of the imaging lens, and further improve the operating speed of the overall imaging device.

[0009] The above description of the disclosure content and the following description of the embodiments are used to demonstrate and explain the spirit and principle of the present invention, and provide a further explanation of the claims of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A schematic side cross-sectional view of an imaging lens according to a first embodiment of the present invention is shown.

[0011] Figure 2 Shown Figure 1 A three-dimensional schematic view of the imaging lens of

[0012] Figure 3 Shown Figure 2 A partially enlarged schematic view of the AA area of the imaging lens of

[0013] Figure 4 Shown Figure 2 A partially enlarged schematic view of the convex structure of the imaging lens of

[0014] Figure 5 Shown Figure 1 A schematic view of the image side view angle of the imaging lens of

[0015] Figure 6 A schematic side cross-sectional view of an imaging lens according to a second embodiment of the present invention is shown.

[0016] Figure 7 Shown Figure 6 A three-dimensional schematic view of the imaging lens of

[0017] Figure 8 Shown Figure 7 A partially enlarged schematic view of the BB area of the imaging lens of

[0018] Figure 9 Shown Figure 6 A schematic view of the image side view angle of the imaging lens of

[0019] Figure 10 A schematic side cross-sectional view of an imaging lens according to a third embodiment of the present invention is shown.

[0020] Figure 11 Illustrate Figure 10 The schematic diagram of the image side view angle of the imaging lens shown in

[0021] Figure 12 Illustrate Figure 10 The schematic side sectional view of the imaging lens shown in at another view angle.

[0022] Figure 13 Illustrate Figure 10 The partial enlarged schematic diagram of the bump structure of the imaging lens shown in

[0023] Figure 14 The schematic side sectional view of the imaging lens according to the fourth embodiment of the present invention is illustrated.

[0024] Figure 15 Illustrate Figure 14 The three-dimensional schematic diagram of the imaging lens shown in

[0025] Figure 16 Illustrate Figure 15 The partial enlarged schematic diagram of the DD area of the imaging lens shown in

[0026] Figure 17 Illustrate Figure 14 The schematic diagram of the image side view angle of the imaging lens shown in

[0027] Figure 18 The three-dimensional schematic diagram of an image pickup device according to the fifth embodiment of the present invention is illustrated.

[0028] Figure 19 The three-dimensional schematic diagram of an electronic device according to the sixth embodiment of the present invention is illustrated.

[0029] Figure 20 Illustrate Figure 19 The three-dimensional schematic diagram of the other side of the electronic device shown in

[0030] Figure 21 Illustrate Figure 19 The system block diagram of the electronic device shown in

[0031] Figure 22 The three-dimensional schematic diagram of the first anti-reflection structure according to an embodiment of the present invention is illustrated.

[0032] Figure 23 The three-dimensional schematic diagram of the first anti-reflection structure according to another embodiment of the present invention is illustrated.

[0033] Figure 24 The three-dimensional schematic diagram of the first anti-reflection structure according to another embodiment of the present invention is illustrated.

[0034] Figure 25A perspective view showing a first anti-reflection structure according to another embodiment of the present invention.

[0035] Figure 26 A perspective view showing a first anti-reflection structure according to yet another embodiment of the present invention.

[0036] Symbol description:

[0037] 1, 2, 2’, 3, 4... imaging lenses

[0038] 101, 201, 301, 401... optical axes

[0039] 102, 202, 302, 402... imaging surfaces

[0040] 10, 20, 30, 40... plastic lens barrels

[0041] 1001, 2001, 3001, 4001... object-side ends

[0042] 1002, 2002, 3002, 4002... image-side ends

[0043] 110, 210, 310, 410... image-side parts

[0044] 1100, 2100, 3100, 4100... bump structures

[0045] 1101, 2101, 3101, 4101... inner surfaces

[0046] 1102, 2102, 3102, 4102... outer surfaces

[0047] 1103, 2103, 3103, 4103... anti-reflection surfaces

[0048] 1104, 2104, 3104, 4104... first anti-reflection structures

[0049] 1104a, 2104a, 3104a, 4104a, 5104a, 6104a, 7104a, 9104a... strip-shaped protrusions

[0050] 8104b... conical protrusions

[0051] 1105, 2105, 3105, 4105... second anti-reflection structures

[0052] 1105a, 2105a, 3105a... strip-shaped protrusions

[0053] 120, 220, 320, 420... object-side openings

[0054] 130, 230... third anti-reflection structures

[0055] 130a, 230a... strip-shaped protrusions

[0056] 240... mounting structure

[0057] 250... outer side surface

[0058] 12, 22, 32, 42... optical elements

[0059] 1201, 2201, 3201, 4201... most similar side optical elements

[0060] 24... drive assembly

[0061] 2401, 2401’... coils

[0062] 2402, 2402’... magnetic elements

[0063] 36... colloid

[0064] 18, 28, 48... light filtering elements

[0065] 5, 5’, 6a, 6b, 6c, 6d... imaging devices

[0066] 51, 61a... electronic photosensitive elements

[0067] 6... electronic device

[0068] 6e... indicator lamp

[0069] 62... flash module

[0070] 63... focus assist module

[0071] 64... image signal processor

[0072] 65... user interface

[0073] 651... shooting button

[0074] 652... image playback button

[0075] 653... imaging device switching button

[0076] 654... integrated menu button

[0077] 655... floating window

[0078] 66... image software processor

[0079] 67... circuit board

[0080] 671... connector

[0081] 68... electronic components

[0082] 681… Signal transmission module

[0083] 682… Memory

[0084] 683… Random access memory

[0085] 684… Gyroscope

[0086] 685… Position locator

[0087] 69… System on a chip

[0088] θ1… The minimum angle between the line connecting the bump structure and the optical axis in the direction perpendicular to the optical axis and the line connecting the inner rectangle angle of the imaging surface to the optical axis in the direction perpendicular to the optical axis

[0089] And the line connecting the inner rectangle angle of the imaging surface to the optical axis in the direction perpendicular to the optical axis

[0090] θ2… The minimum angle between the two lines connecting the adjacent two of the bump structures to the optical axis in the direction perpendicular to the optical axis

[0091] H… The physical length of the bump structure along the direction parallel to the optical axis

[0092] IMGH… The maximum distance from the imaging surface to the optical axis in the direction perpendicular to the optical axis

[0093] L… The physical length of the imaging lens along the direction parallel to the optical axis

[0094] OBJ… Object to be photographed

[0095] RG… Anti-reflection groove

[0096] TTL… The distance from the object side end of the imaging lens to the imaging surface in the direction of the optical axis

[0097] VS… Valley structure Detailed implementation mode

[0098] The detailed features and advantages of the present invention are described in detail in the following embodiments. The content is sufficient for any person skilled in the art to understand the technical content of the present invention and implement it accordingly. According to the content disclosed in this specification, the scope of the patent application and the drawings, any person skilled in the art can easily understand the relevant purposes and advantages of the present invention. The following embodiments further illustrate the viewpoints of the present invention in detail, but do not limit the scope of the present invention in any way.

[0099] The present invention provides an imaging lens having an optical axis and an imaging surface. The optical axis passes through the imaging surface, and the appearance of the imaging surface can be rectangular. The imaging lens includes a plastic lens barrel, and the plastic lens barrel surrounds the optical axis. The plastic lens barrel includes an image side portion and an object side opening, the image side portion is located between the imaging surface and the object side opening, and the optical axis passes through the object side opening. Specifically, the plastic lens barrel may have an object side end facing the object side and an image side end facing the image side and the imaging surface, wherein the object side opening is located at the object side end, and the image side portion is located at the image side end. Among them, the cross-section of the plastic lens barrel at the image side end may have a non-circular appearance. Thereby, it can be matched with the design of the imaging surface or the image capturing device to which it is to be applied; by cooperating with the imaging surface, the light imaging outside the imaging surface can be reduced, further reducing stray light, and thus improving the imaging quality; by cooperating with the image capturing device, the effect of fixing the position of the imaging lens can be achieved, further reducing the assembly tolerance. Please refer to Figure 9 , which shows a schematic view of the imaging lens 2 observed from the image side according to the second embodiment of the present invention, wherein the cross-section of the plastic lens barrel 20 at the image side end 2002 has an appearance of a square with chamfers. Please refer to Figure 11 , which shows a schematic view of the imaging lens 3 observed from the image side according to the third embodiment of the present invention, wherein the cross-section of the plastic lens barrel 30 at the image side end 3002 has an oval appearance.

[0100] The image side portion includes a plurality of bump structures, and the plurality of bump structures are arranged around the optical axis and extend toward the imaging surface. Each of the bump structures has an inner side surface, an outer side surface, and at least one anti-reflection surface. The inner side surface faces the optical axis. The outer side surface is disposed opposite to the inner side surface, and the outer side surface is farther from the optical axis than the inner side surface. The at least one anti-reflection surface extends along the direction toward the imaging surface, and the at least one anti-reflection surface connects the inner side surface and the outer side surface. Each of the bump structures includes at least one first anti-reflection structure, and the at least one first anti-reflection structure is disposed on the at least one anti-reflection surface. Through the bump structures included at the image side end of the plastic lens barrel and the anti-reflection surfaces of the bump structures, the relative illumination can be effectively improved, and thus good imaging quality can be obtained. In addition, such a plastic lens barrel structure can also further reduce the overall volume and weight of the imaging lens, and thus improve the overall operating speed.

[0101] The number of the plurality of bump structures may be two, and the two bump structures may be oppositely disposed in the orientation relative to the optical axis. Thereby, when the imaging lens is placed with the object side end facing away from a platform such as an assembly structure, the imaging lens will not tilt, which is beneficial to assembly. Among them, the number of the plurality of bump structures may also be at least three, and the at least three bump structures may also be axially symmetrically disposed with respect to the optical axis in the orientation relative to the optical axis. Please refer to Figure 2, showing that in the first embodiment of the present invention, four bump structures 1100 are arranged axially symmetrically with respect to the optical axis 101 in terms of their orientation relative to the optical axis 101.

[0102] Each of the bump structures may further include a second anti-reflection structure, the second anti-reflection structure is disposed on the inner side surface, and the second anti-reflection structure is connected to the at least one first anti-reflection structure located on the at least one anti-reflection surface. Thereby, stray light from the image side portion can be further reduced. Among them, the cross-section of the mutually connected first anti-reflection structure and the second anti-reflection structure in the direction perpendicular to the optical axis may have a U-shaped appearance. Please refer to Figure 8 , showing that in the second embodiment of the present invention, the cross-section of the first anti-reflection structure 2104 and the second anti-reflection structure 2105 in the direction perpendicular to the optical axis 201 has a U-shaped appearance.

[0103] The imaging lens according to the present invention may further include a plurality of optical elements, and the plurality of optical elements may be housed in a plastic lens barrel. The optical axis passes through the plurality of optical elements. The plurality of bump structures are closer to the imaging surface than the plurality of optical elements. Specifically, the plurality of optical elements include a most image-side optical element, and the most image-side optical element is closer to the imaging surface than other optical elements in the plastic lens barrel, and the plurality of bump structures are closer to the imaging surface than the most image-side optical element. Thereby, the plurality of bump structures can protect the plurality of optical elements from the image side to improve the yield rate of the finished product. Among them, the most image-side optical element may be an optical lens or a fixing ring.

[0104] The at least one first anti-reflection structure may have a plurality of anti-reflection grooves and may have a V-shaped structure. Specifically, the at least one first anti-reflection structure may include a plurality of strip-shaped protrusions or conical protrusions, and the plurality of strip-shaped protrusions or conical protrusions are arranged side by side to form a V-shaped structure, and an anti-reflection groove is formed between any two adjacent strip-shaped protrusions or conical protrusions. Thereby, it is beneficial to reduce stray light to improve the relative illuminance, and thus obtain good imaging quality. Among them, the plurality of strip-shaped protrusions may extend from the object-side opening to the image side portion, and the cross-section of the plurality of strip-shaped protrusions in the direction perpendicular to the optical axis may have a triangular, trapezoidal or arc-shaped appearance. Among them, the plurality of strip-shaped protrusions may also have a rounded corner design. Please refer to Figure 8 , showing that in the second embodiment of the present invention, a plurality of strip-shaped protrusions 2104a extending from the object-side opening 220 to the image side portion 210, and the cross-section of the strip-shaped protrusions 2104a in the direction perpendicular to the optical axis 201 has a triangular appearance. Please refer to Figure 23 , showing a schematic diagram of a strip-shaped protrusion 6104a having a trapezoidal appearance cross-section in still another embodiment of the present invention. Please refer to Figure 24, showing a schematic diagram of a strip-shaped protrusion 7104a with an arc-shaped outer cross-section in another embodiment according to the present invention. Please refer to Figure 25 , showing a schematic diagram of a plurality of conical protrusions 8104b in yet another embodiment according to the present invention. Please refer to Figure 26 , showing a schematic diagram of a strip-shaped protrusion 9104a with a rounded corner design in yet another embodiment according to the present invention. As can be seen from the above reference figures, the at least one first antireflection structure may include protrusion structures arranged in different directions or protruding in different shapes.

[0105] The plastic lens barrel may further include at least one third antireflection structure at the image side end, and the at least one third antireflection structure faces the imaging surface and connects to the at least one first antireflection structure of the plurality of bump structures. By designing the plastic lens barrel to also have an antireflection structure at the image side end, the stray light generated at the image side end can be further reduced, thereby improving the imaging quality. Please refer to Figure 3 , showing a schematic diagram of the third antireflection structure 130 included in the plastic lens barrel 10 at the image side end 1002 in the first embodiment according to the present invention. The above first to third antireflection structures are exemplified by valley-shaped structures, but the present invention is not limited thereto. In some embodiments, any one of the first to third antireflection structures may also be changed to have a roughened surface to achieve the antireflection effect, and the roughened surface may be manufactured by subtractive processes such as sandblasting and etching or by additive processes such as transfer printing and coating. Please refer to Figure 16 , showing a schematic diagram of the second antireflection structure 4105 of the bump structure 1100 having a roughened surface in the fourth embodiment according to the present invention, where Figure 16 the roughened surface is represented by dots.

[0106] In the imaging lens disclosed by the present invention, at least one driving component may be further included. The plastic lens barrel may further include at least one mounting structure, and the at least one mounting structure is disposed on an outer side surface of the plastic lens barrel and protrudes in a direction away from the optical axis. The at least one driving component may include a coil and a magnetic element. One of the coil and the magnetic element may be disposed on the at least one mounting structure, and the coil and the magnetic element are disposed opposite to each other. The coil and the magnetic element are used to drive the imaging lens to move or rotate; thereby, the driving component can achieve the effects of autofocus and optical stabilization through the electromagnetic force generated by the electromagnetic interaction between the coil and the magnetic element; in addition, by integrating the imaging lens and the driving component into an integrated design, the overall volume can be further reduced. Among them, the coil may be disposed on the at least one mounting structure, and the magnetic element is disposed opposite to the coil; or, the magnetic element may be disposed on the at least one mounting structure, and the coil is disposed opposite to the magnetic element. Among them, the number of the at least one driving component may be two, the number of the at least one mounting structure may be two, and the two mounting structures may be symmetrically located on opposite sides of the plastic lens barrel with respect to the optical axis to respectively accommodate the two driving components thereon; thereby, the driving component can provide a smoother electromagnetic force. Please refer to Figure 7 , which shows two coils 2401 of two mounting structures 240 disposed on the plastic lens barrel 20, and two magnetic elements 2402 respectively disposed opposite to the two coils 2401, according to the second embodiment of the present invention.

[0107] In the imaging lens disclosed by the present invention, at least one colloid may be further included. The at least one colloid is disposed around the optical axis, and the at least one colloid is closer to the imaging surface than the peripheral regions of the plurality of optical elements. Thereby, the colloid can play the role of fixing the optical elements equivalent to a fixing ring, can save the occupied thickness compared with the fixing ring, and can simultaneously achieve the effect of protecting the peripheral regions of the optical elements. Please refer to Figure 10 and Figure 11 , which shows the colloids 36 arranged around the optical axis 301, according to the third embodiment of the present invention.

[0108] The physical length of the plurality of bump structures along the direction parallel to the optical axis is H, and the physical length of the imaging lens along the direction parallel to the optical axis is L, and the following conditions may be satisfied: 5% ≤ H / L×100% ≤ 30%. By restricting the ratio of the bump structure to the physical length of the imaging lens, the molding yield rate of the plastic lens barrel can be improved. Among them, the following conditions may also be satisfied: 0.3 [mm] ≤ H ≤ 1.3 [mm]. In this specification, the so-called "physical length" refers to the length of the actual object occupying the physical area. Therefore, the "physical length of the imaging lens" does not include the area where the imaging surface is located. Please refer to Figure 1 , Figure 6 , Figure 10 and Figure 14, respectively showing schematic diagrams of parameters H and L in the first to fourth embodiments of the present invention.

[0109] The minimum angle θ1 between the line connecting from the plurality of bump structures to the optical axis in the direction perpendicular to the optical axis and the line connecting from the rectangular inner angle of the imaging surface to the optical axis in the direction perpendicular to the optical axis can satisfy the following condition: 5 [degrees] ≤ θ1 ≤ 50 [degrees]. Thereby, when the imaging lens is assembled to an image capturing device, the unexpected internal stray light caused by the excessive assembly tolerance between the imaging lens and the image capturing device can be avoided, thereby improving the yield of the finished product. Please refer to Figure 5 , Figure 9 , Figure 11 and Figure 17 , respectively showing schematic diagrams of parameter θ1 in the first to fourth embodiments of the present invention.

[0110] The minimum angle θ2 between two lines connecting from two adjacent ones of the plurality of bump structures to the optical axis in the direction perpendicular to the optical axis can satisfy the following condition: 25 [degrees] ≤ θ2 ≤ 150 [degrees]. Thereby, when the imaging lens is assembled to an image capturing device, the unexpected internal stray light caused by the excessive assembly tolerance between the imaging lens and the image capturing device can be avoided, thereby improving the yield of the finished product. Please refer to Figure 5 , Figure 9 , Figure 11 and Figure 17 , respectively showing schematic diagrams of parameter θ2 in the first to fourth embodiments of the present invention.

[0111] The maximum distance from the imaging surface to the optical axis in the direction perpendicular to the optical axis is IMGH, the distance from the object side end of the imaging lens to the imaging surface in the optical axis direction is TTL, and the focal length of the imaging lens is EFL, which can satisfy the following condition: 0.6 < IMGH / [(TTL + EFL) / 2] < 1.7. Thereby, when the size and focal length of the imaging lens and the size of the photosensitive element match within this range, the effect of the bump structure can be further highlighted, enabling it to function as an antireflection surface. Among them, the following condition can also be satisfied: 0.65 < IMGH / [(TTL + EFL) / 2] < 1.65. Among them, the following condition can also be satisfied: 0.7 ≤ IMGH / [(TTL + EFL) / 2] ≤ 1.2. In this specification, the so-called "object side end of the imaging lens" refers to the object side end of the element closest to the object side among the elements included in the imaging lens, which can be the object side end of the plastic lens barrel, the object side end of the optical element, or even the object side end of the driving component. Please refer to Figure 1 , Figure 6 , Figure 10 and Figure 14 , respectively showing schematic diagrams of parameter TTL in the first to fourth embodiments of the present invention; Please refer to Figure 5 ,Figure 9 , Figure 11 and Figure 17 , respectively showing schematic diagrams of the parameter IMGH in the first to fourth embodiments of the present invention. Among the above four embodiments, the object-side ends 1001, 2001, 3001, and 4001 of the plastic lens barrels 10, 20, 30, and 40 are used as the object-side ends of the imaging lenses 1, 2, 3, and 4.

[0112] All the technical features in the imaging lens of the present invention can be combined and configured to achieve corresponding effects.

[0113] The present invention can appropriately set a variable aperture element, which can be a mechanical component or a light control element, and its aperture size and shape can be controlled by electricity or electrical signals. The mechanical component can include movable parts such as a vane group and a shielding plate; the light control element can include shielding materials such as a filter element, an electrochromic material, and a liquid crystal layer. The variable aperture element can enhance the image adjustment ability by controlling the light amount entering the image or the exposure time.

[0114] According to the above embodiments, specific embodiments are proposed below and will be described in detail with reference to the accompanying drawings.

[0115] <First Embodiment>

[0116] Please refer to Figures 1 to 5 , in which Figure 1 shows a side cross-sectional schematic diagram of the imaging lens according to the first embodiment of the present invention, Figure 2 shows Figure 1 a three-dimensional schematic diagram of the imaging lens, Figure 3 shows Figure 2 a partial enlarged schematic diagram of the AA area of the imaging lens, Figure 4 shows Figure 2 a partial enlarged schematic diagram of the bump structure of the imaging lens, and Figure 5 shows Figure 1 a schematic diagram of the image-side view angle of the imaging lens.

[0117] In this embodiment, the imaging lens 1 has an optical axis 101 and an imaging surface 102. The optical axis 101 passes through the geometric center of the imaging surface 102, and the appearance of the imaging surface 102 is rectangular as shown in Figure 5 . The imaging lens 1 includes a plastic lens barrel 10 and a plurality of optical elements 12. The plastic lens barrel 10 surrounds the optical axis 101, the optical elements 12 are received in the plastic lens barrel 10, and the optical axis 101 passes through the optical elements 12. Among them, the optical elements 12 include, for example, lenses, light shields, apertures, diaphragms, spacer rings, and fixing rings, etc., and the present invention is not limited thereto.

[0118] The plastic lens barrel 10 has an object side (such as, Figure 1One object-side end 1001 on the left side of the drawing) and an image-side end 1002 of the imaging surface 102 facing the image side (e.g., Figure 1 The right side of the drawing) and an image-side end 1002 of the imaging surface 102. As Figure 5 shown, when observing the imaging lens 1 from the image side, the cross-section of the plastic lens barrel 10 at the image-side end 1002 has a circular appearance.

[0119] The plastic lens barrel 10 includes an image-side portion 110 and an object-side opening 120. The image-side portion 110 is located at the image-side end 1002 and is between the imaging surface 102 and the object-side opening 120. The object-side opening 120 is located at the object-side end 1001, and the optical axis 101 passes through the object-side opening 120. The object-side opening 120 can serve as the aperture of the imaging lens 1 for light to enter the optical element 12 in the plastic lens barrel 10.

[0120] The image-side portion 110 includes four bump structures 1100, and the bump structures 1100 are arranged in pairs in the azimuth with respect to the optical axis 101. Specifically, the bump structures 1100 arc around the optical axis 101 and are arranged symmetrically with respect to the optical axis 101. The bump structures 1100 extend toward the imaging surface 102. Each bump structure 1100 has an inner side surface 1101, an outer side surface 1102, and two antireflection surfaces 1103. Each inner side surface 1101 faces the optical axis 101. The outer side surface 1102 and the inner side surface 1101 are respectively oppositely arranged, and the outer side surface 1102 is respectively farther from the optical axis 101 than the inner side surface 1101. The antireflection surface 1103 extends along the direction toward the imaging surface 102; or in other words, the surface extension direction of the antireflection surface 1103 faces the imaging surface 102. And the antireflection surface 1103 is connected between the inner side surface 1101 and the outer side surface 1102.

[0121] Each bump structure 1100 includes two first antireflection structures 1104 and one second antireflection structure 1105. The first antireflection structures 1104 are respectively arranged on the antireflection surface 1103. The second antireflection structures 1105 are respectively arranged on the inner side surface 1101, and the second antireflection structures 1105 are connected between the first antireflection structures 1104.

[0122] Each first antireflection structure 1104 includes a plurality of strip-shaped protrusions 1104a, the strip-shaped protrusions 1104a are arranged side by side along the direction of the optical axis 101, and the cross-section of the strip-shaped protrusions 1104a in the direction parallel to the optical axis 101 has a circular arc appearance. These side-by-side arranged strip-shaped protrusions 1104a form a valley-shaped structure VS, and an antireflection groove RG is formed between any two adjacent strip-shaped protrusions 1104a.

[0123] Each second anti-reflection structure 1105 includes a plurality of strip-shaped protrusions 1105a, which are arranged side by side extending from the object-side opening 120 to the image-side portion 110, and the cross-section of the strip-shaped protrusions 1105a in a direction perpendicular to the optical axis 101 has a triangular appearance. These side-by-side strip-shaped protrusions 1105a also form a valley-shaped structure VS, and an anti-reflection groove RG is formed between any two adjacent strip-shaped protrusions 1105a. In addition, two first anti-reflection structures 1104 and one second anti-reflection structure 1105 that are connected to each other form a U shape in a cross-section perpendicular to the optical axis 101.

[0124] The plastic lens barrel 10 further includes a third anti-reflection structure 130 at the image-side end 1002, and the third anti-reflection structure 130 includes a plurality of strip-shaped protrusions 130a. Some of the strip-shaped protrusions 130a of the third anti-reflection structure 130 are located on the surface facing the imaging surface 102 and connected to the strip-shaped protrusions 1104a of the first anti-reflection structure 1104 of the bump structure 1100, extending in a direction perpendicular to the optical axis 101, while some other strip-shaped protrusions 130a of the third anti-reflection structure 130 are located on the surface facing the optical axis 101 and connected to the strip-shaped protrusions 1105a of the second anti-reflection structure 1105 of the bump structure 1100, extending from the object-side opening 120 to the image-side portion 110. The cross-section of the strip-shaped protrusions 130a has a triangular appearance, and these strip-shaped protrusions 130a are arranged side by side to also form a valley-shaped structure VS, and an anti-reflection groove RG is formed between any two adjacent strip-shaped protrusions 130a.

[0125] The strip-shaped protrusions 1104a of the above-mentioned first anti-reflection structure 1104 are similar to the strip-shaped protrusions 7104a with a circular-arc appearance cross-section as shown in Figure 24 shown, while the strip-shaped protrusions 1105a of the second anti-reflection structure 1105 and the strip-shaped protrusions 130a of the third anti-reflection structure 130 are similar to the strip-shaped protrusions 5104a with a triangular appearance cross-section as shown in Figure 22 shown, but the present invention is not limited thereto. The first anti-reflection structure 1104 may also include strip-shaped protrusions 5104a, 6104a, 9104a or conical protrusions 8104b of other embodiments as shown in Figure 22 , 23 , 26 or Figure 25 shown, while the second anti-reflection structure 1105 or the third anti-reflection structure 130 may also include strip-shaped protrusions 6104a, 7104a, 9104a or conical protrusions 8104b of other embodiments as shown in Figure 23 , 24 , 26 or Figure 25 shown.

[0126] The optical element 12 includes a rearmost optical element 1201. The rearmost optical element 1201 is an optical lens, and the rearmost optical element 1201 is closer to the imaging surface 102 than other optical elements in the plastic lens barrel 10. The bump structure 1100 is closer to the imaging surface 102 than the rearmost optical element 1201 in the direction parallel to the optical axis 101.

[0127] The imaging lens 1 further includes a filter element 18. The material of the filter element 18 is glass, and it is disposed between the rearmost optical element 1201 and the imaging surface 102 without affecting the focal length of the imaging lens 1.

[0128] The physical length of the bump structure 1100 in the direction parallel to the optical axis 101 is H, and the physical length of the imaging lens 1 in the direction parallel to the optical axis 101 is L, and they satisfy the following conditions: H = 0.8 [mm]; L = 6.97 [mm]; and H / L×100% = 11.5%.

[0129] The minimum angle θ1 between the connection line in the direction perpendicular to the optical axis 101 from the bump structure 1100 to the optical axis 101 and the connection line in the direction perpendicular to the optical axis 101 from the rectangular inner angle of the imaging surface 102 to the optical axis 101 satisfies the following conditions: θ1 = 16 [degrees].

[0130] The minimum angle θ2 between the two connection lines in the direction perpendicular to the optical axis 101 from two adjacent ones of the bump structures 1100 to the optical axis 101 satisfies the following conditions: θ2 = 49 [degrees].

[0131] The maximum distance in the direction perpendicular to the optical axis 101 from the imaging surface 102 to the optical axis 101 is IMGH, the distance in the direction of the optical axis 101 from the object side end of the imaging lens 1 (in this embodiment, that is, the object side end 1001 of the plastic lens barrel 10) to the imaging surface 102 is TTL, and the focal length of the imaging lens 1 is EFL, and they satisfy the following conditions: IMGH = 6.24 [mm]; TTL = 7.8 [mm]; EFL = 5.2 [mm]; and IMGH / [(TTL + EFL) / 2] = 0.96.

[0132] <Second Embodiment>

[0133] Please refer to Figures 6 to 9 , in which Figure 6 shows a schematic side cross-sectional view of an imaging lens according to a second embodiment of the present invention, Figure 7 shows Figure 6 a three-dimensional schematic view of the imaging lens, Figure 8 shows Figure 7 a partially enlarged schematic view of the BB area of the imaging lens, and Figure 9 shows Figure 6 a schematic view of the image side view angle of the imaging lens.

[0134] In this embodiment, the imaging lens 2 has an optical axis 201 and an imaging surface 202. The optical axis 201 passes through the geometric center of the imaging surface 202, and the appearance of the imaging surface 202 is rectangular as shown in Figure 9 . The imaging lens 2 includes a plastic lens barrel 20, a plurality of optical elements 22, and two driving components 24. The plastic lens barrel 20 surrounds the optical axis 201. The optical elements 22 are received in the plastic lens barrel 20. The optical axis 201 passes through the optical elements 22, and the driving components 24 are disposed outside the plastic lens barrel 20. Among them, the optical elements 22 include, for example, lenses, light shields, apertures, diaphragms, spacer rings, fixing rings, etc., but the present invention is not limited thereto.

[0135] The plastic lens barrel 20 has an object-side end 2001 facing the object side (e.g., Figure 6 the left side of the drawing) and an image-side end 2002 facing the image side (e.g., Figure 6 the right side of the drawing) and the imaging surface 202. As shown in Figure 9 , when observing the imaging lens 2 from the image side, the cross-section of the plastic lens barrel 20 at the image-side end 2002 has an appearance of a square with chamfers.

[0136] The plastic lens barrel 20 includes an image-side portion 210 and an object-side opening 220. The image-side portion 210 is located at the image-side end 2002 and is between the imaging surface 202 and the object-side opening 220. The object-side opening 220 is located at the object-side end 2001, and the optical axis 201 passes through the object-side opening 220. The object-side opening 220 can serve as the aperture of the imaging lens 2 for light to enter the optical elements 22 in the plastic lens barrel 20.

[0137] The image-side portion 210 includes four bump structures 2100, and the bump structures 2100 are arranged in pairs in the orientation relative to the optical axis 201. Specifically, the bump structures 2100 surround the optical axis 201. The bump structures 2100 extend toward the imaging surface 202. Each bump structure 2100 has an inner side surface 2101, an outer side surface 2102, and two antireflection surfaces 2103. Each inner side surface 2101 faces the optical axis 201. The outer side surface 2102 and the inner side surface 2101 are respectively oppositely arranged, and the outer side surface 2102 is respectively farther from the optical axis 201 than the inner side surface 2101. The antireflection surfaces 2103 extend along the direction toward the imaging surface 202; or in other words, the surface extension direction of the antireflection surfaces 2103 faces the imaging surface 202. And the antireflection surfaces 2103 are connected between the inner side surface 2101 and the outer side surface 2102.

[0138] Each bump structure 2100 includes two first anti-reflection structures 2104 and one second anti-reflection structure 2105. The first anti-reflection structures 2104 are respectively disposed on the anti-reflection surface 2103. The second anti-reflection structure 2105 is disposed on the inner side surface 2101, and the second anti-reflection structure 2105 is connected between the first anti-reflection structures 2104.

[0139] Each first anti-reflection structure 2104 includes a plurality of strip-shaped protrusions 2104a. The strip-shaped protrusions 2104a are arranged side by side extending from the object-side opening 220 to the image-side portion 210, and the cross-section of the strip-shaped protrusions 2104a in a direction perpendicular to the optical axis 201 has a triangular appearance. These strip-shaped protrusions 2104a arranged side by side form a valley-shaped structure VS, and an anti-reflection groove RG is formed between any two adjacent strip-shaped protrusions 2104a.

[0140] Each second anti-reflection structure 2105 includes a plurality of strip-shaped protrusions 2105a. The strip-shaped protrusions 2105a are arranged side by side extending along the circumferential direction centered on the optical axis 201, and the cross-section of the strip-shaped protrusions 2105a in the direction from the object-side opening 220 to the image-side portion 210 has a triangular appearance. These strip-shaped protrusions 2105a arranged side by side also form a valley-shaped structure VS, and an anti-reflection groove RG is formed between any two adjacent strip-shaped protrusions 2105a. In addition, the two first anti-reflection structures 2104 and the second anti-reflection structure 2105 connected to each other form a U shape in a cross-section perpendicular to the optical axis 201.

[0141] The plastic lens barrel 20 further includes a third anti-reflection structure 230 at the image-side end 2002, and the third anti-reflection structure 230 includes a plurality of strip-shaped protrusions 230a. The strip-shaped protrusions 230a of the third anti-reflection structure 230 are located on the surface facing the optical axis 201 and are connected to the strip-shaped protrusions 2105a of the second anti-reflection structure 2105 of the bump structure 2100, extending along the circumferential direction centered on the optical axis 201. The cross-section of the strip-shaped protrusions 230a has a triangular appearance. These strip-shaped protrusions 230a arranged side by side also form a valley-shaped structure VS, and an anti-reflection groove RG is formed between any two adjacent strip-shaped protrusions 230a.

[0142] The strip-shaped protrusions 2104a of the above-mentioned first anti-reflection structure 2104, the strip-shaped protrusions 2105a of the second anti-reflection structure 2105, and the strip-shaped protrusions 230a of the third anti-reflection structure 230 are similar to the strip-shaped protrusions 5104a having a triangular appearance cross-section as shown in Figure 22 However, the present invention is not limited thereto. The first anti-reflection structure 2104, the second anti-reflection structure 2105, or the third anti-reflection structure 230 may also include as shown in Figure 23 , 24 , 26 or Figure 25The strip-shaped protrusions 6104a, 7104a, 9104a or the cone-shaped protrusion 8104b of other embodiments shown.

[0143] The optical element 22 includes a most image-side optical element 2201, the most image-side optical element 2201 is an optical lens, and the most image-side optical element 2201 is closer to the imaging surface 202 than other optical elements in the plastic lens barrel 20. The bump structure 2100 is closer to the imaging surface 202 than the most image-side optical element 2201 in the direction parallel to the optical axis 201.

[0144] The plastic lens barrel 20 further includes two mounting structures 240, and the mounting structures 240 are symmetrically arranged on the outer side surface 250 of the plastic lens barrel 20 with respect to the optical axis 201 and protrude in a direction away from the optical axis 201. The driving assembly 24 includes two coils 2401 and two magnetic elements 2402. The coils 2401 are arranged on the mounting structures 240, and the magnetic elements 2402 are arranged opposite to the coils 2401. The coils 2401 and the magnetic elements 2402 can generate an electromagnetic force through electromagnetic interaction to drive the imaging lens 2 to move in the direction of the optical axis 201, or to move and rotate in a direction perpendicular to the optical axis 201.

[0145] The imaging lens 2 further includes a filter element 28. The material of the filter element 28 is glass, and it is arranged between the most image-side optical element 2201 and the imaging surface 202 without affecting the focal length of the imaging lens 2.

[0146] The physical length of the bump structure 2100 in the direction parallel to the optical axis 201 is H, and the physical length of the imaging lens 2 in the direction parallel to the optical axis 201 is L, which satisfy the following conditions: H = 0.855 [mm]; L = 7.5 [mm]; and H / L × 100% = 11.4%.

[0147] The minimum included angle θ1 between the line connecting from the bump structure 2100 to the optical axis 201 in the direction perpendicular to the optical axis 201 and the line connecting from the rectangular inner angle of the imaging surface 202 to the optical axis 201 in the direction perpendicular to the optical axis 201 satisfies the following conditions: θ1 = 8 [degrees].

[0148] The minimum included angle θ2 between the two lines connecting from two adjacent ones of the bump structure 2100 to the optical axis 201 in the direction perpendicular to the optical axis 201 satisfies the following conditions: θ2 = 88 [degrees].

[0149] The maximum distance from the imaging surface 202 to the optical axis 201 in the direction perpendicular to the optical axis 201 is IMGH, the distance from the object side end of the imaging lens 2 (in this embodiment, that is, the object side end 2001 of the plastic lens barrel 20) to the imaging surface 202 in the direction of the optical axis 201 is TTL, the focal length of the imaging lens 2 is EFL, and they satisfy the following conditions: IMGH = 6.4 [mm]; TTL = 9.4 [mm]; EFL = 7.74 [mm]; and IMGH / [(TTL + EFL) / 2] = 0.75.

[0150] <Third Embodiment>

[0151] Please refer to Figures 10 to 13 , in which Figure 10 FIG. shows a schematic side cross-sectional view of an imaging lens according to the third embodiment of the present invention, Figure 11 shows Figure 10 a schematic view of the image side viewing angle of the imaging lens of Figure 12 shows Figure 10 a schematic side cross-sectional view of the imaging lens of at another viewing angle, and Figure 13 shows Figure 10 a partially enlarged schematic view of the bump structure of the imaging lens of .

[0152] In this embodiment, the imaging lens 3 has an optical axis 301 and an imaging surface 302. The optical axis 301 passes through the geometric center of the imaging surface 302, and the appearance of the imaging surface 302 is rectangular as Figure 11 shown. The imaging lens 3 includes a plastic lens barrel 30 and a plurality of optical elements 32. The plastic lens barrel 30 surrounds the optical axis 301, the optical elements 32 are received in the plastic lens barrel 30, and the optical axis 301 passes through the optical elements 32. Among them, the optical elements 32 may include, for example, lenses, light shields, apertures, diaphragms, spacer rings, and fixing rings, etc., and the present invention is not limited thereto.

[0153] The plastic lens barrel 30 has an object side end 3001 facing the object side (such as, Figure 10 the left side of the drawing) and an image side end 3002 facing the image side (such as, Figure 10 the right side of the drawing) and the imaging surface 302. As Figure 11 shown, when observing the imaging lens 3 from the image side, the cross-section of the plastic lens barrel 30 at the image side end 3002 has an oval appearance.

[0154] The plastic lens barrel 30 includes an image side portion 310 and an object side opening 320. The image side portion 310 is located at the image side end 3002 and is between the imaging surface 302 and the object side opening 320. The object side opening 320 is located at the object side end 3001, and the optical axis 301 passes through the object side opening 320. The object side opening 320 can serve as the aperture of the imaging lens 3 for light to enter the optical elements 32 in the plastic lens barrel 30.

[0155] The image side portion 310 includes two bump structures 3100, and the bump structures 3100 are oppositely arranged in terms of the orientation with respect to the optical axis 301. Specifically, the bump structures 3100 are strip-shaped and surround the optical axis 301 and are arranged axially symmetrically with respect to the optical axis 301. The bump structures 3100 extend toward the imaging surface 302. Each bump structure 3100 has an inner side surface 3101, an outer side surface 3102, and two antireflection surfaces 3103. Each inner side surface 3101 faces the optical axis 301. The outer side surfaces 3102 and the inner side surfaces 3101 are respectively oppositely arranged, and the outer side surfaces 3102 are respectively farther from the optical axis 301 than the inner side surfaces 3101. The antireflection surfaces 3103 extend along the direction toward the imaging surface 302; or in other words, the surface extension direction of the antireflection surfaces 3103 faces the imaging surface 302. And the antireflection surfaces 3103 are connected between the inner side surfaces 3101 and the outer side surfaces 3102.

[0156] Each bump structure 3100 includes two first antireflection structures 3104 and one second antireflection structure 3105. The first antireflection structures 3104 are respectively arranged on the antireflection surfaces 3103. The second antireflection structures 3105 are respectively arranged on the inner side surfaces 3101, and the second antireflection structures 3105 are connected between the first antireflection structures 3104.

[0157] Each first antireflection structure 3104 includes a plurality of strip-shaped protrusions 3104a, the strip-shaped protrusions 3104a are arranged side by side along the direction of the optical axis 301, and the cross-section of the strip-shaped protrusions 3104a in the direction parallel to the optical axis 301 has an arc-shaped appearance. These side-by-side arranged strip-shaped protrusions 3104a form a valley-shaped structure VS, and an antireflection groove RG is formed between any two adjacent strip-shaped protrusions 3104a.

[0158] Each second antireflection structure 3105 includes a plurality of strip-shaped protrusions 3105a, the strip-shaped protrusions 3105a are arranged side by side along the direction perpendicular to the optical axis 301, and the cross-section of the strip-shaped protrusions 3105a in the direction perpendicular to the optical axis 301 has an arc-shaped appearance. These side-by-side arranged strip-shaped protrusions 3105a also form a valley-shaped structure VS, and an antireflection groove RG is formed between any two adjacent strip-shaped protrusions 3105a. In addition, the two connected first antireflection structures 3104 and the second antireflection structure 3105 form a U shape in the cross-section perpendicular to the optical axis 301.

[0159] The strip-shaped protrusions 3104a of the above-mentioned first antireflection structure 3104 and the strip-shaped protrusions 3105a of the second antireflection structure 3105 are similar to the strip-shaped protrusions 7104a with an arc-shaped appearance cross-section as shown in Figure 24 shown, but the present invention is not limited thereto. The first antireflection structure 3104 or the second antireflection structure 3105 may also include asFigure 22 , 23 , 26 or Figure 25 the strip-shaped protrusions 5104a, 6104a, 9104a or the conical protrusions 8104b of other embodiments shown in

[0160] The optical element 32 includes a most image-side optical element 3201, the most image-side optical element 3201 is an optical lens, and the most image-side optical element 3201 is closer to the imaging surface 302 than other optical elements in the plastic lens barrel 30. The bump structure 3100 is closer to the imaging surface 302 than the most image-side optical element 3201 in the direction parallel to the optical axis 301.

[0161] The imaging lens 3 further includes two colloids 36, the colloids 36 are symmetrically and oppositely arranged around the optical axis 301 between the two bump structures 3100, and the colloids 36 are located between the most image-side optical element 3201 in the peripheral area and the bump structure 3100 in the direction parallel to the optical axis 301.

[0162] The physical length of the bump structure 3100 in the direction parallel to the optical axis 301 is H, the physical length of the imaging lens 3 in the direction parallel to the optical axis 301 is L, and they satisfy the following conditions: H = 1.1 [mm]; L = 6.83 [mm]; and H / L×100% = 16.1%.

[0163] The minimum included angle θ1 between the line connecting from the bump structure 3100 to the optical axis 301 in the direction perpendicular to the optical axis 301 and the line connecting from the rectangular inner angle of the imaging surface 302 to the optical axis 301 in the direction perpendicular to the optical axis 301 satisfies the following conditions: θ1 = 14 [degrees].

[0164] The minimum included angle θ2 between the two lines connecting from two adjacent ones of the bump structures 3100 to the optical axis 301 in the direction perpendicular to the optical axis 301 satisfies the following conditions: θ2 = 102 [degrees].

[0165] The maximum distance from the imaging surface 302 to the optical axis 301 in the direction perpendicular to the optical axis 301 is IMGH, the distance from the object side end of the imaging lens 3 (in this embodiment, that is, the object side end 3001 of the plastic lens barrel 30) to the imaging surface 302 in the direction of the optical axis 301 is TTL, the focal length of the imaging lens 3 is EFL, and they satisfy the following conditions: IMGH = 6.5 [mm]; TTL = 7.8 [mm]; EFL = 6.72 [mm]; and IMGH / [(TTL + EFL) / 2] = 0.90.

[0166] <Fourth Embodiment>

[0167] Please refer to Figures 14 to 17 , where Figure 14A schematic side cross-sectional view of an imaging lens according to a fourth embodiment of the present invention is shown. Figure 15 Shown Figure 14 is a three-dimensional schematic diagram of the imaging lens. Figure 16 Shown Figure 15 is a partially enlarged schematic diagram of the DD region of the imaging lens, and Figure 17 Shown Figure 14 is a schematic diagram of the image-side view angle of the imaging lens.

[0168] In this embodiment, the imaging lens 4 has an optical axis 401 and an imaging surface 402. The optical axis 401 passes through the geometric center of the imaging surface 402, and the appearance of the imaging surface 402 is rectangular as Figure 17 shown. The imaging lens 4 includes a plastic lens barrel 40 and a plurality of optical elements 42. The plastic lens barrel 40 surrounds the optical axis 401, the optical elements 42 are received in the plastic lens barrel 40, and the optical axis 401 passes through the optical elements 42. Among them, the optical elements 42 include, for example, lenses, light shields, apertures, diaphragms, spacer rings, fixing rings, etc., and the present invention is not limited thereto.

[0169] The plastic lens barrel 40 has an object-side end 4001 facing the object side (such as, Figure 14 the left side of the drawing) and an image-side end 4002 facing the image side (such as, Figure 14 the right side of the drawing) and the imaging surface 402. As Figure 17 shown, when observing the imaging lens 4 from the image side, the cross-section of the plastic lens barrel 40 at the image-side end 4002 has a circular appearance.

[0170] The plastic lens barrel 40 includes an image-side portion 410 and an object-side opening 420. The image-side portion 410 is located at the image-side end 4002 and is between the imaging surface 402 and the object-side opening 420. The object-side opening 420 is located at the object-side end 4001, and the optical axis 401 passes through the object-side opening 420. The object-side opening 420 can be used as the aperture of the imaging lens 4 for light to enter the optical elements 42 in the plastic lens barrel 40.

[0171] The object side portion 410 includes two bump structures 4100, and the bump structures 4100 are oppositely arranged in terms of the orientation with respect to the optical axis 401. Specifically, the bump structures 4100 arc around the optical axis 401 and are arranged symmetrically with respect to the optical axis 401. The bump structures 4100 extend toward the imaging surface 402. Each bump structure 4100 has an inner side surface 4101, an outer side surface 4102, and an antireflection surface 4103. Each inner side surface 4101 faces the optical axis 401. The outer side surfaces 4102 and the inner side surfaces 4101 are respectively oppositely arranged, and the outer side surfaces 4102 are respectively farther from the optical axis 401 than the inner side surfaces 4101. The antireflection surface 4103 extends along the direction toward the imaging surface 402; or in other words, the surface extension direction of the antireflection surface 4103 faces the imaging surface 402. Moreover, the antireflection surface 4103 is connected between the inner side surface 4101 and the outer side surface 4102.

[0172] Each bump structure 4100 includes a first antireflection structure 4104 and a second antireflection structure 4105. The first antireflection structures 4104 are respectively disposed on the antireflection surface 4103. The second antireflection structures 4105 are respectively disposed on the inner side surfaces 4101.

[0173] Each first antireflection structure 4104 includes a plurality of strip-shaped protrusions 4104a, and the strip-shaped protrusions 4104a are arranged side by side extending from the object side opening 420 to the object side portion 410, and the cross-section of the strip-shaped protrusions 4104a in the direction perpendicular to the optical axis 401 has a triangular appearance. These side-by-side arranged strip-shaped protrusions 4104a form a valley-shaped structure VS, and an antireflection groove RG is formed between any two adjacent strip-shaped protrusions 4104a.

[0174] Each second antireflection structure 4105 has a roughened surface to achieve the same antireflection effect as the antireflection groove RG, wherein the roughened surface of the second antireflection structure 4105 can be manufactured by subtractive processes such as sandblasting, etching, etc. or can be manufactured by additive processes such as transfer printing, coating, etc.

[0175] The strip-shaped protrusions 4104a of the above-mentioned first antireflection structure 4104 are similar to the strip-shaped protrusions 5104a having a triangular appearance cross-section as Figure 22 shown, but the present invention is not limited thereto. The first antireflection structure 4104 may also include strip-shaped protrusions 6104a, 7104a, 9104a or conical protrusions 8104b of other embodiments as Figure 23 、 24 、26 or Figure 25 shown.

[0176] The optical element 42 includes a rearmost optical element 4201, which is an optical lens, and the rearmost optical element 4201 is closer to the imaging surface 402 than other optical elements in the plastic lens barrel 40. The bump structure 4100 is closer to the imaging surface 402 than the rearmost optical element 4201 in the direction parallel to the optical axis 401.

[0177] The imaging lens 4 further includes a filter element 48. The material of the filter element 48 is glass, and it is disposed between the rearmost optical element 4201 and the imaging surface 402 without affecting the focal length of the imaging lens 4.

[0178] The physical length of the bump structure 4100 in the direction parallel to the optical axis 401 is H, and the physical length of the imaging lens 4 in the direction parallel to the optical axis 401 is L, which satisfy the following conditions: H = 0.54 [mm]; L = 3.80 [mm]; and H / L×100% = 14.2%.

[0179] The minimum angle θ1 between the line connecting from the bump structure 4100 to the optical axis 401 in the direction perpendicular to the optical axis 401 and the line connecting from the rectangular inner angle of the imaging surface 402 to the optical axis 401 in the direction perpendicular to the optical axis 401 satisfies the following condition: θ1 = 11 [degrees].

[0180] The minimum angle θ2 between the two lines connecting from two adjacent ones of the bump structures 4100 to the optical axis 401 in the direction perpendicular to the optical axis 401 satisfies the following condition: θ2 = 114 [degrees].

[0181] The maximum distance from the imaging surface 402 to the optical axis 401 in the direction perpendicular to the optical axis 401 is IMGH, the distance from the object side end of the imaging lens 4 (in this embodiment, that is, the object side end 4001 of the plastic lens barrel 40) to the imaging surface 402 in the direction of the optical axis 401 is TTL, and the focal length of the imaging lens 4 is EFL, which satisfy the following conditions: IMGH = 3.261 [mm]; TTL = 4.65 [mm]; EFL = 4.58 [mm]; and IMGH / [(TTL + EFL) / 2] = 0.71.

[0182] <Fifth Embodiment>

[0183] Please refer to Figure 18, a perspective view showing an imaging device according to the fifth embodiment of the present invention. In this embodiment, the imaging device 5 is a camera module. The imaging device 5 includes the imaging lens 2 of the second embodiment described above, an electronic photosensitive element 51, and an image stabilization module (not shown separately). The imaging device 5 can also be configured with the imaging lenses of the other embodiments described above, and the present invention is not limited thereto. The imaging device 5 uses the imaging lens 2 to converge light to generate an image, and cooperates with the driving component 24 of the imaging lens 2 to perform image focusing. Finally, the image is formed on the electronic photosensitive element 51 and can be output as image data.

[0184] The driving component 24 can have an auto-focus function. In addition to generating an electromagnetic force through electromagnetic interaction between the coil 2401 and the magnetic element 2402 in the second embodiment described above, driving systems such as a voice coil motor (VCM), a micro electro-mechanical systems (MEMS), a piezoelectric system, and a shape memory alloy can also be used. The driving component 24 can enable the imaging lens 2 to obtain a better imaging position, and can provide clear images for the object to be photographed in different object distance states. In addition, the imaging device 5 is equipped with an electronic photosensitive element 51 with good sensitivity and low noise (such as CMOS, CCD) disposed on the imaging surface 202 of the imaging lens 2 (marked in Figure 6 ), which can truly present the good imaging quality of the imaging lens 2.

[0185] The image stabilization module is, for example, an accelerometer, a gyroscope, or a Hall effect sensor. The driving component 24 can cooperate with the image stabilization module to jointly serve as an optical image stabilization (OIS) device, compensating for the blurred image generated by shaking during the shooting moment by adjusting the changes of the imaging lens 2 in different axial directions, or using the image compensation technology in the image software to provide an electronic image stabilization (EIS) function, further improving the imaging quality in dynamic and low-light scenes.

[0186] <Sixth Embodiment>

[0187] Please refer to Figures 19 to 21 , where Figure 19 a perspective view showing one side of an electronic device according to the sixth embodiment of the present invention, Figure 20 shows Figure 19 a perspective view of the other side of the electronic device of Figure 21 shows Figure 19System block diagram of an electronic device.

[0188] In this embodiment, the electronic device 6 is a mobile device, which can be a smart phone, a camera, an aircraft, etc., and the present invention is not limited thereto. The electronic device 6 includes an imaging device 5', imaging devices 6a, 6b, 6c, 6d, a flash module 62, a focus assist module 63, an image signal processor 64 (Image Signal Processor), a user interface 65, and an image software processor 66.

[0189] The imaging device 5', imaging devices 6a and 6b are all arranged on the same side of the electronic device 6. The imaging devices 6c, 6d and the user interface 65 are all arranged on the other side of the electronic device 6, and the user interface 65 is a display device, so that the imaging devices 6c and 6d can be used as front cameras to provide a self-timer function, but the present invention is not limited thereto.

[0190] The imaging device 5' is similar to the imaging device 5, but the imaging device 5' has one more imaging lens than the imaging device 5. Specifically, the imaging device 5' is a dual-lens imaging device including two imaging lenses, one of which is the imaging lens 2 of the second embodiment as described above, and the other is the imaging lens 2'. With such a dual-lens configuration of the imaging device 5', the imaging lens 2' can be similar to the imaging lens 2, and the imaging lens 2' can share one of the magnetic elements 2402 of the imaging lens 2. That is to say, the number of magnetic elements 2402' of the imaging lens 2' can be one less than the number of coils 2401'. The imaging device 5' can simultaneously capture images through the two imaging lenses 2 and 2' to generate a three-dimensional image, or can focus on different objects; alternatively, the imaging device 5' can capture images through a single imaging lens 2 or 2' to generate a two-dimensional planar image. The above imaging device 5' is taken as an example including two similar imaging lenses 2 and 2', but the present invention is not limited thereto. If the imaging device includes two different imaging lenses, the two different imaging lenses can cooperate to produce a zoom effect, or can simultaneously collect visible light sources and infrared light sources.

[0191] In addition, the imaging devices 6a, 6b, 6c, and 6d may all include the imaging lens of the present invention and may all have a structural configuration similar to that of the imaging device 5. Specifically, the imaging device 6a includes the imaging lens 1 of the above first embodiment, an electronic photosensitive element 61a, and an image stabilization module (not shown separately); the imaging device 6c is a dual-lens imaging device similar to the imaging device 5' and includes two imaging lenses 2 and 2'; each of the imaging devices 6b and 6d may include an imaging lens, an electronic photosensitive element, and an image stabilization module. Among them, the imaging lenses of the imaging devices 6b and 6d may each include, for example, an optical lens group of a plurality of optical elements of the present invention, a lens barrel for carrying the optical lens group, such as a plastic lens barrel of the present invention, and a support device.

[0192] The imaging device 5' and the imaging device 6c are each a dual-lens imaging device, the imaging device 6a is an ultra-wide-angle imaging device, the imaging device 6b is a telephoto imaging device, and the imaging device 6d is a time-of-flight (ToF) imaging device. The imaging devices 5', 6a, and 6b of this embodiment have different viewing angles, so that the electronic device 6 can provide different magnification ratios to achieve the shooting effect of optical zoom. In addition, the imaging device 6d can obtain the depth information of the image. The above electronic device 6 is exemplified by including a plurality of imaging devices 5', 6a, 6b, 6c, and 6d, but the number and configuration of the imaging devices are not intended to limit the present invention.

[0193] When the user shoots the object OBJ, the electronic device 6 uses the imaging device 5', the imaging device 6a, or the imaging device 6b to collect light and take an image, activates the flash module 62 to provide fill light, and uses the object distance information of the object OBJ provided by the focus assist module 63 for rapid focusing. In addition, the image signal processor 64 performs image optimization processing to further improve the image quality generated by the imaging lens. The focus assist module 63 can use an infrared or laser focus assist system to achieve rapid focusing.

[0194] In addition, the electronic device 6 can also use the imaging device 6c or the imaging device 6d to take pictures. When the imaging device 6c or the imaging device 6d takes pictures, a warning lamp 6e can emit light to remind the user that the electronic device 6 is taking pictures. The user interface 65 can adopt a touch screen or a physical shooting button 651, and cooperate with the diversified functions of the image software processor 66 to perform image shooting and image processing. The image processed by the image software processor 66 can be displayed on the user interface 65. The user can also replay the previously taken image through the image playback button 652 of the user interface 65, can also select a suitable imaging device for shooting through the imaging device switching button 653, and can also adjust the suitable shooting conditions for the current shooting scene through the integrated menu button 654. In addition, the user interface 65 also has a floating window 655 for the user to synchronously execute applications other than shooting.

[0195] Furthermore, the electronic device 6 further includes a circuit board 67, and the circuit board 67 carries a plurality of electronic components 68. The imaging devices 5', 6a, 6b, 6c, 6d are electrically connected to the electronic components 68 through the connector 671 on the circuit board 67, and the electronic components 68 may include a signal transmitting module 681, and the image can be transmitted to other electronic devices or cloud storage through the signal transmitting module 681. Among them, the signal transmitting module 681 can be a Wireless Fidelity (WiFi) module, a Bluetooth module, an infrared module, a network service module or an integrated module of the above multiple signal transmissions, and the present invention is not limited thereto.

[0196] The electronic component 68 may also include a memory 682, a random access memory 683 to store image signals, a gyroscope 684, and a position locator 685 to facilitate the navigation or positioning of the electronic device 6. In this embodiment, the image signal processor 64, the image software processor 66 and the random access memory 683 are integrated into a single chip system 69, but the present invention is not limited to this configuration. In some other embodiments, the electronic components can also be integrated into the imaging device or can also be disposed on one of the multiple circuit boards.

[0197] The imaging lenses 1-4 of the present invention are not limited to being applied to mobile devices. The imaging lenses 1-4 can more visually be applied to a system with mobile focus, and have the characteristics of excellent aberration correction and good imaging quality. For example, the imaging lenses 1-4 can be applied to electronic devices such as three-dimensional (3D) image capture, digital cameras, mobile devices, tablet computers, smart TVs, network monitoring devices, dash cams, reverse imaging devices, multi-lens devices, identification systems, motion sensing game consoles and wearable devices in many aspects. The above-mentioned electronic devices are only exemplary illustrations of the actual application examples of the present invention, and do not limit the application scope of the camera module of the present invention.

[0198] Although the present invention has been disclosed above in the foregoing embodiments, these embodiments are not intended to limit the present invention. Any modifications and refinements made without departing from the spirit and scope of the present invention fall within the scope of patent protection of the present invention. For the scope of protection defined by the present invention, please refer to the appended claims.

Claims

1. An imaging lens, characterized in that, It has an optical axis and an imaging surface, the optical axis passes through the imaging surface, and the imaging lens includes: A plastic lens barrel surrounding the optical axis, the plastic lens barrel includes an image side portion and an object side opening, the image side portion is located between the imaging surface and the object side opening, and the optical axis passes through the object side opening; Wherein, the image side portion includes a plurality of bump structures, the plurality of bump structures are arranged around the optical axis and extend towards the imaging surface, and each of the bump structures has: An inner side surface facing the optical axis; An outer side surface opposite to the inner side surface, and the outer side surface is farther from the optical axis than the inner side surface; and At least one anti-reflection surface extending along the direction towards the imaging surface, and the at least one anti-reflection surface connects the inner side surface and the outer side surface; Wherein, each of the bump structures includes at least one first anti-reflection structure, and the at least one first anti-reflection structure is arranged on the at least one anti-reflection surface; Wherein, the appearance of the imaging surface is a rectangle, and the minimum included angle θ1 between the line connecting from the plurality of bump structures to the optical axis in the direction perpendicular to the optical axis and the line connecting from the inner angle of the rectangle to the optical axis in the direction perpendicular to the optical axis satisfies the following conditions: 5 degrees ≤ θ1 ≤ 50 degrees.

2. The imaging lens according to claim 1, wherein The number of the plurality of bump structures is two, and the two bump structures are arranged opposite to each other in the orientation relative to the optical axis.

3. The imaging lens according to claim 1, characterized in that, The physical length of the plurality of bump structures in the direction parallel to the optical axis is H, and the physical length of the imaging lens in the direction parallel to the optical axis is L, and it satisfies the following conditions: 5% ≤ H / L×100% ≤ 30%.

4. The imaging lens according to claim 1, wherein Each of the bump structures further includes a second anti-reflection structure, the second anti-reflection structure is arranged on the inner side surface, and the second anti-reflection structure connects the at least one first anti-reflection structure located on the at least one anti-reflection surface.

5. The imaging lens according to claim 1, characterized in that, The imaging lens further includes a plurality of optical elements, the plurality of optical elements are received in the plastic lens barrel, the optical axis passes through the plurality of optical elements, and the plurality of bump structures are closer to the imaging surface than the plurality of optical elements.

6. The imaging lens according to claim 1, wherein The minimum included angle θ2 between the two lines connecting from two adjacent ones of the plurality of bump structures to the optical axis respectively in the direction perpendicular to the optical axis satisfies the following conditions: 25 degrees ≤ θ2 ≤ 150 degrees.

7. The imaging lens according to claim 1, wherein, The maximum distance from the imaging surface to the optical axis in the direction perpendicular to the optical axis is IMGH, the distance from one object side end of the imaging lens to the imaging surface in the direction of the optical axis is TTL, and the focal length of the imaging lens is EFL, and it satisfies the following conditions: 0.6 < IMGH / [(TTL + EFL) / 2] < 1.

7.

8. The imaging lens according to claim 7, characterized in that The maximum distance from the imaging surface to the optical axis in the direction perpendicular to the optical axis is IMGH, the distance from the object side end of the imaging lens to the imaging surface in the direction of the optical axis is TTL, and the focal length of the imaging lens is EFL, and it satisfies the following conditions: 0.7 ≤ IMGH / [(TTL + EFL) / 2] ≤ 1.

2.

9. The imaging lens according to claim 1, wherein The at least one first anti-reflection structure has a plurality of anti-reflection grooves and has a valley-shaped structure.

10. The imaging lens according to claim 9, characterized in that, The at least one first anti-reflection structure includes a plurality of strip-shaped protrusions. The plurality of strip-shaped protrusions extend from the object-side opening to the image-side portion. The plurality of strip-shaped protrusions are arranged side by side, and the plurality of strip-shaped protrusions form the valley-shaped structure.

11. The imaging lens according to claim 1, characterized in that, The plastic lens barrel further includes at least one anti-reflection structure at an image-side end. The at least one anti-reflection structure of the plastic lens barrel faces the imaging surface and is connected to the at least one first anti-reflection structure of the plurality of bump structures.

12. The imaging lens according to claim 1 further comprises at least one driving component, wherein, The plastic lens barrel further includes at least one mounting structure. The at least one mounting structure is disposed on an outer side surface of the plastic lens barrel and protrudes in a direction away from the optical axis. The at least one driving assembly includes a coil and a magnetic element. One of the coil and the magnetic element is disposed on the at least one mounting structure. The coil and the magnetic element are disposed opposite to each other, and the coil and the magnetic element are used to drive the imaging lens to move along the optical axis direction.

13. An imaging device, characterized in that, Comprising: The imaging lens according to claim 1.

14. An electronic device, characterized in that, Comprising: The imaging device according to claim 13; and An electronic photosensitive element disposed on the imaging surface of the imaging lens.

Images