Plastic optical folding element, imaging lens module and electronic device

Abstract

A plastic optical switching element includes an incident surface, at least one reflecting surface, an exiting surface, and a reflective film. Light enters the plastic optical switching element through the incident surface. The reflecting surface is used to change the direction of light travel. Light exits the plastic optical switching element through the exiting surface. The reflective film is disposed on the reflecting surface, with a bottom portion of the reflective film in solid contact with the reflecting surface, and a top portion of the reflective film opposite to the bottom portion. From the bottom portion toward the top portion away from the reflecting surface, the reflective film sequentially includes a first multilayer film, a first connecting layer, a first silver atom layer, and a insulating layer. The arrangement of the layers in the reflective film helps to adjust the transmittance and reflected light, and also improves the stability between the layers.

Description

[Technical Field]

[0001] This disclosure relates to a plastic optical switching element and an imaging lens module, and more particularly to a plastic optical switching element and an imaging lens module used in portable electronic devices. [Previous Technology]

[0002] In recent years, portable electronic devices have developed rapidly, such as smart electronic devices and tablets, which have become ubiquitous in modern life. Imaging lenses mounted on these portable electronic devices have also flourished. However, as technology advances, users have increasingly higher demands for the image quality of imaging lenses. Therefore, developing an imaging lens that can improve image quality has become an important and urgent problem for the industry. [Summary of the Invention]

[0003] This disclosure provides a plastic optical transition element, an imaging lens module, and an electronic device. By configuring the layers of the reflective film, it helps to adjust the transmittance and reflected light, and is beneficial to the stability between the layers.

[0004] According to the present disclosure, a plastic optical switching element is provided, comprising an incident surface, at least one reflecting surface, an exiting surface, and a reflective film. Light enters the plastic optical switching element through the incident surface. The reflecting surface is used to change the direction of light travel. Light leaves the plastic optical switching element through the exiting surface. The reflective film is disposed on the reflecting surface, with a bottom of the reflective film in solid contact with the reflecting surface, and a top of the reflective film disposed opposite to the bottom. The reflective film sequentially comprises a first multilayer film, a first connecting layer, a first silver atom layer, a barrier layer, and a second multilayer film from the bottom towards the top direction away from the reflecting surface. The first multilayer film comprises at least one first low refractive index layer and at least one first high refractive index layer, the refractive index of the first high refractive index layer being higher than the refractive index of the first low refractive index layer, and the first high refractive index layer and the first low refractive index layer are alternately stacked. The material of the first connecting layer comprises aluminum oxide. The material of the first silver atom layer comprises silver. The material of the barrier layer comprises at least one of nickel, titanium, vanadium, chromium, nickel oxide, titanium oxide, vanadium oxide, and chromium oxide. The second multilayer film comprises at least one second low-refractive-index layer and at least one second high-refractive-index layer, wherein the refractive index of the second high-refractive-index layer is higher than that of the second low-refractive-index layer, and the second high-refractive-index layer and the second low-refractive-index layer are stacked alternately. The thickness of the first multilayer film is Dmf1, the thickness of the insulating layer is Db, and the distance between the first silver atom layer and the bottom is Hag1, which satisfies the following conditions: 70 nm < Dmf1 < 420 nm; 20 nm < Db < 180 nm; and 90 nm < Hag1 < 550 nm.

[0005] According to the aforementioned plastic optical switching element, the reflective film may further include a second silver atom layer and a second connecting layer. The second silver atom layer is made of silver, is located between the insulating layer and the second multilayer film, is farther from the reflective surface than the insulating layer, and is in solid contact with the insulating layer. The second connecting layer is made of aluminum oxide, is farther from the reflective surface than the second silver atom layer, and is in solid contact with the second silver atom layer.

[0006] According to the aforementioned plastic optical switching element, the number of reflective film layers and the reflective film layer material can be symmetrically arranged with the insulating layer as the center.

[0007] According to the aforementioned plastic optical transition element, at least one of the incident surface, the exit surface and the reflecting surface may have a curvature.

[0008] According to the aforementioned plastic optical switching element, the number of reflective surfaces may be at least two.

[0009] According to the aforementioned plastic optical transition element, the distance between the second silver atom layer and the top is Hag2, which satisfies the following condition: 60 nm < Hag2 < 480 nm.

[0010] According to the aforementioned plastic optical transition element, the distance between the first silver atom layer and the bottom is Hag1, which satisfies the following condition: 180 nm < Hag1 < 460 nm.

[0011] According to the aforementioned plastic optical transition element, the thickness of the insulating layer is Db, which satisfies the following condition: 35 nm < Db < 120 nm.

[0012] According to the aforementioned plastic optical switching element, the average reflectance of the reflective film in the corresponding wavelength range of 400 nm to 1000 nm, measured from the bottom, is R1, which satisfies the following condition: 85% < R1 < 100%. Furthermore, the average reflectance of the reflective film in the corresponding wavelength range of 400 nm to 1000 nm, measured from the top, is R2, which satisfies the following condition: 95% < R2 < 100%.

[0013] In the aforementioned plastic optical switching element, the material of the insulating layer can be mainly nickel.

[0014] According to the aforementioned plastic optical transition element, it may further include a plurality of connecting surfaces, connecting the incident surface, the exit surface and the reflecting surface, wherein the reflecting surface and one of the adjacent connecting surfaces have a step difference structure, the step difference structure causes a height difference between the reflecting surface and the connecting surface, the height difference being Hs, which satisfies the following condition: 0.005 mm ≤ Hs ≤ 0.22 mm.

[0015] According to the present disclosure, a plastic optical switching element is provided, comprising an incident surface, at least one reflecting surface, an exiting surface, and a reflective film. Light enters the plastic optical switching element through the incident surface. The reflecting surface is used to change the direction of light travel. Light leaves the plastic optical switching element through the exiting surface. The reflective film is disposed on the reflecting surface, with a bottom of the reflective film in solid contact with the reflecting surface, and a top of the reflective film disposed opposite to the bottom. The reflective film sequentially comprises a first multilayer film, a first connecting layer, a first silver atom layer, and a insulating layer from the bottom towards the top direction away from the reflecting surface. The first multilayer film comprises at least one first low refractive index layer and at least one first high refractive index layer, the refractive index of the first high refractive index layer being higher than the refractive index of the first low refractive index layer, and the first high refractive index layer and the first low refractive index layer are alternately stacked. The material of the first connecting layer comprises aluminum oxide. The material of the first silver atom layer comprises silver. The material of the insulating layer comprises at least one of nickel, titanium, vanadium, chromium, nickel oxide, titanium oxide, vanadium oxide, and chromium oxide. The thickness of the first multilayer film is Dmf1, the thickness of the insulating layer is Db, and the distance between the first silver atom layer and the reflective surface is Hag1, which satisfies the following conditions: 0.1 < Db / Dmf1 < 0.9; 70 nm < Dmf1 < 420 nm; and 90 nm < Hag1 < 550 nm.

[0016] According to the aforementioned plastic optical switching element, the reflective film may further include a second silver atom layer, the material of which is silver, which is farther away from the reflective surface than the insulating layer and in solid contact with the insulating layer.

[0017] According to the aforementioned plastic optical transition element, at least one of the incident surface, the exit surface and the reflecting surface may have a curvature.

[0018] The plastic optical switching element according to the aforementioned pattern may have at least two reflective surfaces.

[0019] According to the aforementioned plastic optical transition element, the distance between the first silver atom layer and the bottom is Hag1, which satisfies the following condition: 180 nm < Hag1 < 460 nm.

[0020] According to the aforementioned plastic optical transition element, the thickness of the insulating layer is Db, which satisfies the following condition: 35 nm < Db < 120 nm.

[0021] According to the aforementioned plastic optical transition element, the thickness of the first multilayer film is Dmf1, and the thickness of the insulating layer is Db, which satisfies the following condition: 0.1 < Db / Dmf1 < 0.4.

[0022] According to the aforementioned plastic optical switching element, the average reflectance of the reflective film in the corresponding wavelength range of 400 nm to 1000 nm, measured from the bottom, is R1, which satisfies the following condition: 85% < R1 < 100%. Furthermore, the average reflectance of the reflective film in the corresponding wavelength range of 400 nm to 1000 nm, measured from the top, is R2, which satisfies the following condition: 95% < R2 < 100%.

[0023] In the aforementioned plastic optical switching element, the material of the insulating layer can be mainly nickel.

[0024] According to the aforementioned plastic optical transition element, the plastic optical transition element may further include a plurality of connecting surfaces, connecting the incident surface, the exit surface and the reflecting surface, wherein the reflecting surface and one of the adjacent connecting surfaces have a step difference structure, the step difference structure forming a height difference between the reflecting surface and the connecting surface, the height difference being Hs, which satisfies the following condition: 0.005 mm ≤ Hs ≤ 0.22 mm.

[0025] According to the present disclosure, an imaging lens module is provided, which includes a plastic optical transition element of any of the aforementioned types.

[0026] According to the present disclosure, an electronic device is provided, which includes an imaging lens module of the aforementioned form.

Implementation Method

[0028] This disclosure provides a plastic optical switching element, comprising an incident surface, at least one reflecting surface, an exiting surface, and a reflective film. Light enters the plastic optical switching element via the incident surface. The reflecting surface is used to change the direction of light travel. Light exits the plastic optical switching element via the exiting surface. The reflective film is disposed on the reflecting surface, with a bottom of the reflective film in solid contact with the reflecting surface, and a top of the reflective film opposite to the bottom. The reflective film sequentially comprises a first multilayer film, a first connecting layer, a first silver atom layer, a barrier layer, and a second multilayer film from the bottom towards the top direction away from the reflecting surface. The first multilayer film comprises at least one first low refractive index layer and at least one first high refractive index layer, the refractive index of the first high refractive index layer being higher than the refractive index of the first low refractive index layer, and the first high refractive index layer and the first low refractive index layer are alternately stacked. The material of the first connecting layer comprises aluminum oxide. The material of the first silver atom layer comprises silver. The material of the barrier layer comprises at least one of nickel, titanium, vanadium, chromium, nickel oxide, titanium oxide, vanadium oxide, and chromium oxide. The second multilayer film comprises at least one second low-refractive-index layer and at least one second high-refractive-index layer, wherein the refractive index of the second high-refractive-index layer is higher than that of the second low-refractive-index layer, and the second high-refractive-index layer and the second low-refractive-index layer are stacked alternately. The thickness of the first multilayer film is Dmf1, the thickness of the insulating layer is Db, and the distance between the first silver atom layer and the bottom is Hag1, satisfying the following conditions: 70 nm < Dmf1 < 420 nm; 20 nm < Db < 180 nm; and 90 nm < Hag1 < 550 nm. Thus, the first multilayer film helps increase light transmittance and can also adjust the spectrum of reflected light; the first connecting layer helps improve the connection stability of the first silver atom layer; the second multilayer film helps protect the insulating layer and thus strengthens the protection of the first silver atom layer; the thickness of the insulating layer, when meeting the conditions, helps protect the first silver atom layer, preventing oxidation or damage from external forces; and increasing the distance between the first silver atom layer and the reflective surface helps prevent oxidation of the first silver atom layer in high-temperature and high-humidity environments.

[0029] Specifically, the insulating layer may also be an alloy of at least two metals, such as a nickel-titanium alloy, but this disclosure is not limited thereto. Furthermore, in this disclosure, the main material of each layer refers to the main material accounting for more than 50% of the total material.

[0030] The reflective film may further include a second silver atom layer and a second connecting layer. The second silver atom layer is made of silver and is located between the insulating layer and the second multilayer film, farther from the reflective surface than the insulating layer, and in solid contact with the insulating layer. The second connecting layer is made of aluminum oxide and is farther from the reflective surface than the second silver atom layer, and in solid contact with the second silver atom layer. Therefore, adding a second silver atom layer to the reflective film enables both sides of the reflective film to have reflective properties, facilitating rapid testing of the optical quality of the reflective film.

[0031] The number of layers and the materials of the reflective film can be symmetrically arranged with the insulating layer as the center. This makes the optical functions of both sides of the reflective film more consistent, which helps to verify the optical quality of the reflective film.

[0032] At least one of the incident surface, the exit surface, and the reflecting surface may have a curvature. Since the direction of light reflection is difficult to control when there is curvature, and it is difficult to inspect the optical quality of the reflective film, when the surface of the plastic optical switching element has curvature, a reflective film with double-sided reflection function helps to quickly inspect the optical quality of the reflective film. In addition, anti-reflective films may be further provided on the incident surface and the exit surface.

[0033] The number of reflective surfaces can be at least two. Since light may be reflected multiple times inside a plastic optical switching element with multiple reflective surfaces, the testing instrument cannot measure the quality of reflected light inside the plastic optical switching element. A reflective film with double-sided reflective function helps to inspect the optical quality of the reflective film from the outside of the plastic optical switching element.

[0034] The distance between the second silver atom layer and the top is Hag2, which satisfies the following condition: 60 nm < Hag2 < 480 nm. This helps to prevent the oxidation of the second silver atom layer.

[0035] The distance between the first silver atom layer and the bottom is Hag1, which satisfies the following condition: 180 nm < Hag1 < 460 nm. This helps to prevent the oxidation of the first silver atom layer.

[0036] The thickness of the insulating layer is Db, which satisfies the following condition: 35 nm < Db < 120 nm. This helps to protect the silver atom layer.

[0037] In a plastic optical transition element, the average reflectivity of the reflective film in the corresponding wavelength range of 400 nm to 1000 nm is measured from the bottom. The average reflectivity is R1, which satisfies the following condition: 85% < R1 < 100%. This helps to improve the imaging quality of the imaging lens module.

[0038] In a plastic optical switching element, the average reflectivity of the reflective film in the corresponding wavelength range of 400 nm to 1000 nm is measured from the top. The average reflectivity is R2, which satisfies the following condition: 95% < R2 < 100%. This helps to inspect the quality of the reflective film.

[0039] The insulating layer can primarily be made of nickel. Because nickel adheres well to silver atoms, it helps prevent oxidation of the first silver atom layer.

[0040] The plastic optical transition element may further include a plurality of connecting surfaces connecting the incident surface, the exit surface, and the reflecting surface, wherein the reflecting surface and one of the adjacent connecting surfaces have a step structure, the step structure creating a height difference Hs between the reflecting surface and the connecting surface, which satisfies the following condition: 0.005 mm ≤ Hs ≤ 0.22 mm. This facilitates control of mold surface accuracy and automatic optical inspection (AOI). Specifically, injection marks may be provided on the connecting surfaces, which helps to avoid stray light. Additionally, light-absorbing material may be provided on the connecting surfaces to reduce light reflection. Furthermore, the step structure may also be provided on the incident surface or the exit surface, and is not limited to the embodiments or examples disclosed herein.

[0041] This disclosure provides a plastic optical reversing element, comprising an incident surface, at least one reflecting surface, an exiting surface, and a reflective film. Light enters the plastic optical reversing element via the incident surface. The reflecting surface is used to change the direction of light travel. Light exits the plastic optical reversing element via the exiting surface. The reflective film is disposed on the reflecting surface, with a bottom of the reflective film in solid contact with the reflecting surface, and a top of the reflective film disposed opposite to the bottom. The reflective film sequentially comprises a first multilayer film, a first connecting layer, a first silver atom layer, and a insulating layer from the bottom towards the top direction away from the reflecting surface. The first multilayer film comprises at least one first low refractive index layer and at least one first high refractive index layer, the refractive index of the first high refractive index layer being higher than the refractive index of the first low refractive index layer, and the first high refractive index layer and the first low refractive index layer are alternately stacked. The material of the first connecting layer comprises aluminum oxide. The material of the first silver atom layer comprises silver. The material of the insulating layer comprises at least one of nickel, titanium, vanadium, chromium, nickel oxide, titanium oxide, vanadium oxide, and chromium oxide. The thickness of the first multilayer film is Dmf1, the thickness of the insulating layer is Db, and the distance between the first silver atom layer and the reflective surface is Hag1, satisfying the following conditions: 0.1 < Db / Dmf1 < 0.9; 70 nm < Dmf1 < 420 nm; and 90 nm < Hag1 < 550 nm. In this way, the first multilayer film helps increase light transmittance and can also adjust the spectrum of reflected light; the first connecting layer helps improve the connection stability of the first silver atom layer; when the thickness of the insulating layer meets the conditions, it helps protect the first silver atom layer from oxidation or damage by external forces; and increasing the distance between the first silver atom layer and the reflective surface helps prevent the first silver atom layer from oxidizing in high-temperature and high-humidity environments.

[0042] Specifically, the insulating layer may also be an alloy of at least two metals, such as a nickel-titanium alloy, and this disclosure is not limited thereto. Furthermore, in this disclosure, the main material of each layer refers to the main material accounting for more than 50% of the total material.

[0043] The reflective film may further include a second silver atom layer, the material of which contains silver, which is farther away from the reflective surface than the insulating layer and in solid contact with the insulating layer. By adding a second silver atom layer to the reflective film, both sides of the reflective film can have reflective function, which helps to quickly inspect the optical quality of the reflective film.

[0044] At least one of the incident surface, the exit surface, and the reflecting surface may have a curvature. Since the direction of light reflection is difficult to control when there is curvature, and it is difficult to inspect the optical quality of the reflective film, when the surface of the plastic optical switching element has curvature, a reflective film with double-sided reflection function helps to quickly inspect the optical quality of the reflective film. In addition, anti-reflective films may be further provided on the incident surface and the exit surface.

[0045] The number of reflective surfaces may be at least two. Since light may be reflected multiple times inside a plastic optical switching element with multiple reflective surfaces, and the testing instrument cannot measure the quality of reflected light inside the plastic optical switching element, a reflective film with double-sided reflective function helps to inspect the optical quality of the reflective film from the outside of the plastic optical switching element.

[0046] The distance between the first silver atom layer and the bottom is Hag1, which satisfies the following condition: 180 nm < Hag1 < 460 nm. This helps to prevent the oxidation of the first silver atom layer.

[0047] The thickness of the insulating layer is Db, which satisfies the following condition: 35 nm < Db < 120 nm. This helps to protect the silver atom layer.

[0048] The thickness of the first multilayer film is Dmf1, and the thickness of the insulating layer is Db, which satisfies the following condition: 0.1 < Db / Dmf1 < 0.4. In this way, both sides of the first silver atom layer can be protected.

[0049] In a plastic optical transition element, the average reflectivity of the reflective film in the corresponding wavelength range of 400 nm to 1000 nm is measured from the bottom. The average reflectivity is R1, which satisfies the following condition: 85% < R1 < 100%. This helps to improve the imaging quality of the imaging lens module.

[0050] In a plastic optical switching element, the average reflectivity of the reflective film in the corresponding wavelength range of 400 nm to 1000 nm is measured from the top. The average reflectivity is R2, which satisfies the following condition: 95% < R2 < 100%. This helps to inspect the quality of the reflective film.

[0051] The insulating layer can be made primarily of nickel. Nickel has good adhesion to silver atoms, which helps prevent oxidation of the first silver atom layer.

[0052] The plastic optical transition element may further include a plurality of connecting surfaces connecting the incident surface, the exit surface, and the reflecting surface. The reflecting surface and one of the adjacent connecting surfaces have a step structure, which creates a height difference, Hs, between the reflecting surface and the connecting surface, satisfying the following condition: 0.005 mm ≤ Hs ≤ 0.22 mm. This facilitates control of mold surface accuracy and automatic optical inspection. Specifically, injection marks may be provided on the connecting surfaces, which helps to avoid stray light. Additionally, light-absorbing material may be provided on the connecting surfaces to reduce light reflection. Furthermore, the step structure may also be provided on the incident surface or the exit surface, and is not limited to the embodiments or examples disclosed herein.

[0053] This disclosure provides an imaging lens module that includes any of the aforementioned plastic optical transition elements.

[0054] This disclosure provides an electronic device that includes the aforementioned imaging lens module.

[0055] <First Embodiment>

[0056] Please refer to Figure 1A, which illustrates a schematic diagram of an imaging lens module 100 according to a first embodiment of the first embodiment of the present disclosure. As shown in Figure 1A, the imaging lens module 100 includes, from the object side to the image side, a first lens assembly 101, a plastic optical refractive element 110, a second lens assembly 102, a third lens assembly 103, an optical refractive element 104, and an imaging surface 105. The first lens assembly 101 includes a lens barrel element 1011 and at least one lens 1012, with the lens 1012 disposed in the lens barrel element 1011 along the first optical axis X1. The second lens assembly 102 includes a lens barrel element 1021 and a plurality of lenses 1022, with the lens 1022 disposed in the lens barrel element 1021 along the second optical axis X2. The third lens assembly 103 includes a lens barrel element 1031 and at least one lens 1032, with the lens 1032 disposed in the lens barrel element 1031 along the second optical axis X2. The first optical axis X1 is converted into the second optical axis X2 by the plastic optical conversion element 110, and the second optical axis X2 is then converted into the third optical axis X3 by the optical conversion element 104, thereby causing the light rays to be imaged on the imaging surface 105. It should be noted that the optical conversion element 104 may be the same as or different from the plastic optical conversion element 110. The following description will focus on the plastic optical conversion element 110.

[0057] Please refer to Figures 1B, 1C, and 1D, where Figure 1B shows a side view of the plastic optical reversing element 110 according to the first embodiment of the first implementation according to Figure 1A, Figure 1C shows a perspective view of the plastic optical reversing element 110 according to Figure 1B, and Figure 1D shows another perspective view of the plastic optical reversing element 110 according to Figure 1B. As can be seen from Figures 1A, 1B, 1C, and 1D, the plastic optical reversing element 110 includes an incident surface 111, a reflecting surface 112, an exiting surface 113, and a reflective film 114. Light enters the plastic optical reversing element 110 through the incident surface 111, that is, it enters the plastic optical reversing element 110 along the first optical axis X1. The reflecting surface 112 is used to change the direction of light travel; that is, the reflecting surface 112 bends the light and then it travels along the second optical axis X2. Light exits the plastic optical transition element 110 via the exit surface 113. A reflective film 114 is disposed on the reflective surface 112, with the bottom of the reflective film 114 in solid contact with the reflective surface 112, and the top and bottom of the reflective film 114 being disposed opposite each other. In addition, the plastic optical transition element 110 may further include at least one injection mark 116, which is located on a surface of the plastic optical transition element 110 that is different from the incident surface 111, the reflective surface 112, and the exit surface 113.

[0058] Please refer to Figure 1E, which shows a schematic diagram of the reflective film 114 according to Figure 1B. As can be seen from Figure 1E, the reflective film 114 sequentially includes a first multilayer film 1141, a first connecting layer 1142, a first silver atom layer 1143, an insulating layer 1144, a second silver atom layer 1145, a second connecting layer 1146, and a second multilayer film 1147 from the bottom toward the top away from the reflective surface 112.

[0059] Referring to Figure 1F, a schematic diagram of the first multilayer film 1141 according to Figure 1E is shown. As can be seen from Figures 1E and 1F, the first multilayer film 1141 includes two first low-refractive-index layers 1141a and two first high-refractive-index layers 1141b. The refractive index of the first high-refractive-index layer 1141b is higher than that of the first low-refractive-index layer 1141a, and the first high-refractive-index layers 1141b and the first low-refractive-index layers 1141a are stacked alternately, wherein the first low-refractive-index layer 1141a is directly stacked on the reflective surface 112. The first connecting layer 1142 is directly stacked on the first high-refractive-index layer 1141b of the first multilayer film 1141, and its material includes aluminum oxide. The first silver atom layer 1143 is directly stacked on the first connecting layer 1142, and its material includes silver. The insulating layer 1144 is directly stacked on the first silver atom layer 1143, and its material includes nickel. The second silver atom layer 1145 is made of silver and is located between the insulating layer 1144 and the second multilayer film 1147. It is further away from the reflective surface 112 than the insulating layer 1144, but in solid contact with the insulating layer 1144; that is, the second silver atom layer 1145 is directly stacked on the insulating layer 1144. The second connecting layer 1146 is made of aluminum oxide and is further away from the reflective surface 112 than the second silver atom layer 1145, but in solid contact with the second silver atom layer 1145; that is, the second connecting layer 1146 is directly stacked on the second silver atom layer 1145. Please refer to Figure 1G, which illustrates a schematic diagram of the second multilayer film 1147 according to Figure 1E. As shown in Figures 1E and 1G, the second multilayer film 1147 includes two second low refractive index layers 1147a and two second high refractive index layers 1147b. The refractive index of the second high refractive index layer 1147b is higher than that of the second low refractive index layer 1147a, and the second high refractive index layer 1147b and the second low refractive index layer 1147a are stacked alternately, wherein the second high refractive index layer 1147b is directly stacked on the second connecting layer 1146.

[0060] Referring further to Figures 1B, 1C and 1D, the plastic optical transition element 110 may further include a plurality of connecting surfaces 115, which connect the incident surface 111, the exit surface 113 and the reflecting surface 112. The reflecting surface 112 and one of the adjacent connecting surfaces 115 have a step structure 1151. The step structure 1151 creates a height difference Hs between the reflecting surface 112 and the connecting surface 115. In the first embodiment of the first implementation shown in Figure 1B, Hs = 0.05 mm.

[0061] In the first embodiment of the first embodiment, the material and thickness of each layer of the reflective film 114 are disclosed in Table 1A below. Table 1A - First Embodiment of the First Implementation number of floors Material Thickness (nm) 13 Second multilayer film 1147 SiO2 123.26 12 TiO2 28.63 11 SiO2 86.46 10 TiO2 41.7 9 Second connection layer 1146 Al2O3 60 8 Second silver atom layer 1145 Ag 70 7 Insulation layer 1144 Ni 40 6 First silver atom layer 1143 Ag 70 5 First connection layer 1142 Al2O3 60 4 First multilayer film 1141 TiO2 35 3 SiO2 80 2 TiO2 20 1 SiO2 70 Reflective surface 112

[0062] As can be seen from Table 1A, Figure 1E, Figure 1F and Figure 1G, the number of film layers and the film layer materials of the reflective film 114 are symmetrically arranged with the insulating layer 1144 as the center. ​

[0063] In the first embodiment of the first implementation, the thickness of the first multilayer film 1141 is Dmf1, the thickness of the insulating layer 1144 is Db, the distance between the first silver atom layer 1143 and the bottom is Hag1, the distance between the second silver atom layer 1145 and the top is Hag2, the average reflectance of the reflective film 114 in the corresponding band of 400 nm to 1000 nm is measured from the bottom as R1, and the average reflectance of the reflective film 114 in the corresponding band of 400 nm to 1000 nm is measured from the top as R2. The values ​​of the parameters are disclosed in Table 1B below. Table 1B - First Embodiment of the First Implementation Dmf1 (nm) Db (nm) Hag1 (nm) Hag2 (nm) R1 (%) R2 (%) 205 40 265 340.05 87.19 97.10

[0064] Please refer to Figure 1H, which shows the reflectivity of the first side 114a (shown only in Figure 1H) and the second side 114b (shown only in Figure 1H) of the reflective film 114 in Figure 1D. The reflectivity is obtained by coating the reflective film 114 onto a flat plastic test piece. The reflectivity of the first side 114a is measured by penetrating the plastic test piece from the bottom direction of the reflective film 114, and the reflectivity of the second side 114b is measured from the top direction of the reflective film 114.

[0065] Please refer again to Figure 1I, which shows a perspective view of the plastic optical bending element 110 according to the second embodiment of the first embodiment of the present disclosure. As can be seen from Figure 1I, the difference between the plastic optical bending element 110 of the second embodiment of the first embodiment and the plastic optical bending element 110 of the first embodiment is that both the incident surface 111 and the exit surface 113 of the plastic optical bending element 110 of the second embodiment of the first embodiment have curvature. The remaining components and arrangements of the plastic optical bending element 110 of the second embodiment of the first embodiment are the same as or similar to those of the plastic optical bending element 110 of the first embodiment of the first embodiment, and will not be described again here.

[0066] <Second Embodiment>

[0067] Please refer to Figure 2A, which illustrates a schematic diagram of an imaging lens module 200 according to the first embodiment of the second embodiment of the present disclosure. As shown in Figure 2A, the imaging lens module 200 includes, from the object side to the image side, a first lens assembly 201, a second lens assembly 202, a plastic optical transition element 210, and an imaging surface 205. The first lens assembly 201 includes a lens barrel element 2011 and a plurality of lenses 2012. The lenses 2012 are disposed in the lens barrel element 2011 along the first optical axis X1. The second lens assembly 202 includes a lens barrel element 2021 and a plurality of lenses 2022. The lenses 2022 are disposed in the lens barrel element 2021 along the first optical axis X1, and the second lens assembly 202 is located on the image side of the first lens assembly 201 along the first optical axis X1. The first optical axis X1 is bent into the second optical axis X2 and then into the third optical axis X3 by the plastic optical bending element 210, thereby causing the light to be imaged on the imaging surface 205. In addition, the plastic optical bending element 210 is positioned by the housing 2062 and connected to the second lens assembly 202 by the housing 2061. The imaging surface 205 is disposed on the base 207, and the base 207 is connected to the housing 2061.

[0068] Please refer to Figures 2B and 2C, where Figure 2B shows a side view of the plastic optical reversing element 210 according to the first embodiment of the second embodiment in Figure 2A, and Figure 2C shows a perspective view of the plastic optical reversing element 210 according to Figure 2B. As shown in Figures 2A, 2B, and 2C, the plastic optical reversing element 210 includes an incident surface 211, two reflecting surfaces 212, an exiting surface 213, and two reflecting films 214. Light enters the plastic optical reversing element 210 through the incident surface 211, that is, it enters the plastic optical reversing element 210 along the first optical axis X1. The reflecting surface 212 is used to change the direction of light travel; that is, the reflecting surface 212 bends the light and then it travels along the second optical axis X2 and the third optical axis X3. The light leaves the plastic optical reversing element 210 through the exiting surface 213. A reflective film 214 is disposed on a reflective surface 212, with its bottom surface in solid contact with the reflective surface 212, and its top and bottom surfaces positioned opposite each other. It should be noted that the incident surface 211 and the exit surface 213 of the plastic optical reversing element 210 are located on the same side, and there is a total internal reflection surface (not otherwise labeled) between the incident surface 211 and the exit surface 213. Therefore, before the second optical axis X2 is reversed to the third optical axis X3 by the reflective surface 212, it will first be reversed by the total internal reflection surface.

[0069] Please refer to Figure 2D, which shows a schematic diagram of the reflective film 214 according to Figure 2B. As can be seen from Figure 2D, the reflective film 214 sequentially includes a first multilayer film 2141, a first connecting layer 2142, a first silver atom layer 2143, an insulating layer 2144, a second silver atom layer 2145, a second connecting layer 2146, and a second multilayer film 2147 from the bottom toward the top away from the reflective surface.

[0070] Referring to Figure 2E, a schematic diagram of the first multilayer film 2141 according to Figure 2D is shown. As can be seen from Figures 2D and 2E, the first multilayer film 2141 includes two first low-refractive-index layers 2141a and two first high-refractive-index layers 2141b. The refractive index of the first high-refractive-index layer 2141b is higher than that of the first low-refractive-index layer 2141a, and the first high-refractive-index layers 2141b and the first low-refractive-index layers 2141a are stacked alternately, wherein the first low-refractive-index layers 2141a are directly stacked on the reflective surface 212. The first connecting layer 2142 is directly stacked on the first high-refractive-index layer 2141b of the first multilayer film 2141, and its material includes aluminum oxide. The first silver atom layer 2143 is directly stacked on the first connecting layer 2142, and its material includes silver. The insulating layer 2144 is directly stacked on the first silver atom layer 2143, and its material includes nickel. The second silver atom layer 2145 is made of silver and is located between the insulating layer 2144 and the second multilayer film 2147. It is further away from the reflective surface 212 than the insulating layer 2144, but in solid contact with the insulating layer 2144; that is, the second silver atom layer 2145 is directly stacked on the insulating layer 2144. The second connecting layer 2146 is made of aluminum oxide and is further away from the reflective surface 212 than the second silver atom layer 2145, but in solid contact with the second silver atom layer 2145; that is, the second connecting layer 2146 is directly stacked on the second silver atom layer 2145. Please refer to Figure 2F, which illustrates a schematic diagram of the second multilayer film 2147 according to Figure 2D. As shown in Figures 2D and 2F, the second multilayer film 2147 includes two second low-refractive-index layers 2147a and a second high-refractive-index layer 2147b. The refractive index of the second high-refractive-index layer 2147b is higher than that of the second low-refractive-index layer 2147a. The second high-refractive-index layer 2147b and the second low-refractive-index layer 2147a are stacked alternately, wherein the second low-refractive-index layer 2147a is directly stacked on the second connecting layer 2146.

[0071] Referring further to Figures 2B and 2C, the plastic optical transition element 210 may further include a plurality of connecting surfaces 215, which connect the incident surface 211, the exit surface 213, and the reflecting surface 212. A step structure 2151 exists between the reflecting surface 212 and one of the adjacent connecting surfaces 215, creating a height difference Hs between the reflecting surface 212 and the connecting surface 215. In the first embodiment of the second implementation shown in Figure 2B, Hs = 0.03 mm. Furthermore, in the first embodiment of the second implementation shown in Figure 2B, the step structure 2151 creates a height difference Hs' between the exit surface 213 and the connecting surface 215, where Hs' = 0.01 mm.

[0072] In the first embodiment of the second embodiment, the material and thickness of each layer of the reflective film 214 are disclosed in Table 2A below. Table 2A - First Embodiment of the Second Implementation number of floors Material Thickness (nm) 12 Second multilayer film 2147 SiO2 20 11 TiO2 44 10 SiO2 26 9 Second connection layer 2146 Al2O3 28 8 Second silver atom layer 2145 Ag 70 7 Insulation layer 2144 Ni 40 6 First silver atom layer 2143 Ag 70 5 First connection layer 2142 Al2O3 60 4 First multilayer film 2141 TiO2 35 3​ SiO2 80 2 TiO2 20 1 SiO2 70 Reflective surface 212

[0073] In the first embodiment of the second embodiment, the thickness of the first multilayer film 2141 is Dmf1, the thickness of the insulating layer 2144 is Db, the distance between the first silver atom layer 2143 and the bottom is Hag1, the distance between the second silver atom layer 2147 and the top is Hag2, the average reflectance of the reflective film 214 in the corresponding band of 400 nm to 1000 nm is measured from the bottom as R1, and the average reflectance of the reflective film 214 in the corresponding band of 400 nm to 1000 nm is measured from the top as R2. The values ​​of the parameters are disclosed in Table 2B below. Table 2B - First Embodiment of the Second Implementation Dmf1 (nm) Db (nm) Hag1 (nm) Hag2 (nm) R1 (%) R2 (%) 205 40 265 118 87.71 96.00

[0074] Please refer to Figure 2G, which shows the reflectivity of the first side 214a (shown only in Figure 2G) and the second side 214b (shown only in Figure 2G) of the reflective film 214 in Figure 2C. The reflectivity is obtained by coating the reflective film 214 onto a flat plastic test piece. The reflectivity of the first side 214a is measured by penetrating the plastic test piece from the bottom direction of the reflective film 214, and the reflectivity of the second side 214b is measured from the top direction of the reflective film 214.

[0075] <Third Embodiment>

[0076] Please refer to Figure 3A, which illustrates a schematic diagram of the imaging lens module 300 according to the first embodiment of the third embodiment of this disclosure. As shown in Figure 3A, the imaging lens module 300 includes, from the object side to the image side, a plastic optical reversing element 310, a plurality of lenses 3012, and an imaging surface 305 sequentially along the first optical axis X1. The optical reversing element 310 and the lenses 3012 are sequentially disposed on the lens barrel element 3011 from the object side to the image side, and the imaging surface 305 is disposed on the image side of the lenses 3012 and the lens barrel element 3011. After light enters the plastic optical reversing element 310 along the first optical axis X1, it is reversed and then enters the lens 3012 along the first optical axis X1, and is imaged on the imaging surface 305.

[0077] Please refer to Figures 3B and 3C, where Figure 3B shows a side view of the plastic optical reversing element 310 according to the first embodiment of the third embodiment in Figure 3A, and Figure 3C shows a perspective view of the plastic optical reversing element 310 according to Figure 3B. As shown in Figures 3A, 3B, and 3C, the plastic optical reversing element 310 includes an incident surface 311, three reflecting surfaces 3121, 3122, and 3123, an exiting surface 213, and three reflecting films 3141, 3142, and 3143, wherein the reflecting surface 3121 is located on the same side as the incident surface 311, and the reflecting surfaces 3122 and 3123 are located on the same side as the exiting surface 213. Light enters the plastic optical reversing element 310 through the incident surface 311, that is, it enters the plastic optical reversing element 310 along the first optical axis X1. Reflective surfaces 3121, 3122, and 3123 are used to change the direction of light travel; that is, reflective surfaces 3121, 3122, and 3123 deflect the light. The light leaves the plastic optical deflecting element 310 via the exit surface 313. After the reflective surfaces 3121, 3122, and 3123 deflect the light, the light still leaves the plastic optical deflecting element 310 along the first optical axis X1 via the exit surface 313 and enters the lens 2012. Reflective films 3141, 3142, and 3143 are respectively disposed on reflective surfaces 3121, 3122, and 3123. The bottom of each reflective film 3141, 3142, and 3143 is in solid contact with the respective reflective surfaces 3121, 3122, and 3123, and the top and bottom of the reflective films 3141, 3142, and 3143 are disposed opposite each other.

[0078] Please refer to Figure 3D, which shows a schematic diagram of the reflective film 3141 according to Figure 3B. As can be seen from Figure 3D, the reflective film 3141 sequentially includes a first multilayer film 31411, a first connecting layer 31412, a first silver atom layer 31413, an insulating layer 31414, and a second multilayer film 31417 from the bottom toward the top away from the reflective surface 3121.

[0079] Referring to Figure 3E, a schematic diagram of the first multilayer film 31411 according to Figure 3D is shown. As can be seen from Figures 3D and 3E, the first multilayer film 31411 includes two first low-refractive-index layers 31411a and two first high-refractive-index layers 31411b. The refractive index of the first high-refractive-index layer 31411b is higher than that of the first low-refractive-index layer 31411a, and the first high-refractive-index layers 31411b and the first low-refractive-index layers 31411a are stacked alternately, with the first low-refractive-index layers 31411a directly stacked on the reflective surface 3121. The first connecting layer 31412 is directly stacked on the first high-refractive-index layer 31411b of the first multilayer film 31411, and its material includes aluminum oxide. The first silver atom layer 31413 is directly stacked on the first connecting layer 31412, and its material includes silver. The insulating layer 31414 is directly stacked on the first silver atom layer 31413, and its material includes nickel. Please refer to Figure 3F, which illustrates a schematic diagram of the second multilayer film 31417 according to Figure 3D. As shown in Figures 3D and 3F, the second multilayer film 31417 includes a second low refractive index layer 31417a and a second high refractive index layer 31417b. The refractive index of the second high refractive index layer 31417b is higher than that of the second low refractive index layer 31417a, and the second high refractive index layer 31417b and the second low refractive index layer 31417a are stacked alternately, wherein the second low refractive index layer 31417a is directly stacked on the insulating layer 31414.

[0080] It must be noted that in the first embodiment of the third embodiment, the structure, material and arrangement relationship of the other two reflective films 3142 and 3143 with the corresponding reflective surfaces 3122 and 3123 may be the same as or similar to the aforementioned reflective film 3141 and its corresponding reflective surface 3121, and will not be described again here.

[0081] Referring further to Figure 3C, the plastic optical transition element 310 may further include a plurality of connecting surfaces 315, which connect the incident surface 311 and the reflecting surfaces 3122 and 3123. The reflecting surfaces 3122 and 3123 have a step structure (not otherwise labeled) with the adjacent connecting surfaces 315, creating a height difference between the reflecting surfaces 3122 and 3123 and the connecting surfaces 315. Additionally, the incident surface 311 also has a step structure with the adjacent connecting surfaces 315.

[0082] The relevant parameters and materials of the first embodiment of the third embodiment of this disclosure are the same as or similar to those of the first embodiment of the first embodiment or the first embodiment of the second embodiment, and will not be repeated here.

[0083] <Fourth Embodiment>

[0084] Please refer to Figures 4A and 4B, wherein Figure 4A illustrates a schematic diagram of the electronic device 40 according to the fourth embodiment of this disclosure, and Figure 4B illustrates another schematic diagram of the electronic device 40 according to Figure 4A in the fourth embodiment. As can be seen from Figures 4A and 4B, the electronic device 40 is a smartphone. The electronic device 40 includes a plurality of camera modules and a user interface 46. Each camera module may include the imaging lens module disclosed in any embodiment of any of the first to third embodiments described above, but this disclosure is not limited thereto. Furthermore, the camera modules are a high-resolution camera module 41, an ultra-wide-angle camera module 42, and dual telephoto camera modules 43 and 44, and the user interface 46 is a touch screen, but this is not a limitation.

[0085] The user enters the shooting mode through the user interface 46, which is used to display the screen and can be used to manually adjust the shooting angle to switch between different camera modules. At this time, the camera module gathers the imaging light onto the electronic image sensor and outputs the relevant electronic signal of the image to the image signal processing element (ISP) 45.

[0086] As shown in Figure 4A, depending on the camera specifications of the electronic device 40, the electronic device 40 may further include an optical image stabilization component (not shown). Furthermore, the electronic device 40 may further include at least one focus assist module (not shown) and at least one sensing element (not shown). The focus assist module may be a color temperature compensation flash module, an infrared rangefinder, a laser focus module, etc. The sensing element may have the function of sensing physical momentum and kinetic energy, such as an accelerometer, gyroscope, or Hall effect element, to sense the shaking and tremors caused by the user's hand or the external environment. This facilitates the performance of the autofocus function and optical image stabilization component configured in the camera module of the electronic device 40, resulting in good image quality. This helps the electronic device 40 according to this disclosure to have multiple shooting modes, such as optimized self-timer, low-light HDR (High Dynamic Range) imaging, and high-resolution 4K video recording. In addition, users can directly view the camera's shooting screen through the user interface 46 and manually operate the framing range on the user interface 46 to achieve the WYSIWYG autofocus function.

[0087] Furthermore, the camera module, optical image stabilization component, sensing element, and focus assist module can be mounted on a flexible printed circuit board (FPC) (not shown), and electrically connected to the imaging signal processing element 45 and other related components through a connector (not shown) to perform the shooting process. Current electronic devices, such as smartphones, are trending towards thinner and lighter designs. By mounting the camera module and related components on a flexible printed circuit board and then using a connector to integrate the circuitry onto the mainboard of the electronic device, the design and circuit layout requirements of the limited internal space of the electronic device can be met, providing greater flexibility. This also allows for more flexible control of the camera module's autofocus function via the touchscreen of the electronic device. In the fourth embodiment, the electronic device 40 may include multiple sensing elements and multiple focus assist modules. The sensing elements and focus assist modules are mounted on a flexible printed circuit board and at least one other flexible printed circuit board (not shown), and electrically connected to the imaging signal processing element 45 and other related components through corresponding connectors to perform the shooting process. In other embodiments (not shown), the sensing element and auxiliary optical element may also be mounted on the motherboard of the electronic device or other types of carrier boards, depending on the mechanical design and circuit layout requirements.

[0088] In addition, the electronic device 40 may further include, but is not limited to, a display unit, a control unit, a storage unit, a temporary storage unit (RAM), a read-only storage unit (ROM), or a combination thereof.

[0089] Figure 4C illustrates an image captured by the electronic device 40 according to the fourth embodiment of Figure 4A. As can be seen from Figure 4C, the ultra-wide-angle camera module 42 can capture images of a larger range, thus having the function of capturing more scenery.

[0090] Figure 4D illustrates another image captured by the electronic device 40 according to the fourth embodiment of Figure 4A. As can be seen from Figure 4D, the high-resolution camera module 41 can capture images of a certain range and also have high resolution, with the function of high resolution and low distortion.

[0091] Figure 4E illustrates another image captured by the electronic device 40 according to the fourth embodiment of Figure 4A. As can be seen from Figure 4E, the telephoto camera modules 43 and 44 have a high magnification function, which can capture distant images and magnify them to a high degree.

[0092] As can be seen from Figures 4C to 4E, by using camera modules with different focal lengths for framing and combining them with image processing technology, the electronic device 40 can achieve the function of zooming.

[0093] <Fifth Embodiment>

[0094] Please refer to Figure 5, which illustrates a schematic diagram of the electronic device 50 according to the fifth embodiment of this disclosure. As shown in Figure 5, the electronic device 50 is a smartphone, and the electronic device 50 includes a plurality of camera modules, wherein each camera module may include the imaging lens module disclosed in any embodiment of any of the first to third embodiments, but this disclosure is not limited thereto. Furthermore, the camera modules are ultra-wide-angle camera modules 51, 52, wide-angle camera modules 53, 54, telephoto camera modules 55, 56, 57, 58, and TOF module (Time-Of-Flight) 59, and the TOF module 59 may be other types of camera modules, and is not limited to this configuration. Moreover, the telephoto camera modules 57 and 58 have the function of reversing the optical path, but this disclosure is not limited thereto.

[0095] Depending on the camera specifications of the electronic device 50, the electronic device 50 may further include an optical image stabilization component (not shown). Furthermore, the electronic device 50 may further include at least one focus assist module (not shown) and at least one sensing element (not shown). The focus assist module may be a color temperature-compensating flash module 501, an infrared rangefinder, a laser focus module, etc. The sensing element may have the function of sensing physical momentum and kinetic energy, such as an accelerometer, gyroscope, or Hall effect element, to sense the shaking and tremors caused by the user's hand or the external environment. This facilitates the performance of the autofocus function and optical image stabilization component configured in the camera module of the electronic device 50, resulting in good image quality. This helps the electronic device 50 according to this disclosure to have multiple shooting modes, such as optimized self-timer, low-light HDR (High Dynamic Range) imaging, and high-resolution 4K video recording.

[0096] In addition, the structure and arrangement of the remaining components in the fifth embodiment are the same as those in the fourth embodiment, and will not be described again here.

[0097] Although the present disclosure has been disclosed above with reference to embodiments, it is not intended to limit the present disclosure. Anyone with ordinary knowledge in the art may make some modifications and refinements without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of the present disclosure shall be determined by the appended claims. [Simplified Explanation of the Diagram]

[0027] Figure 1A shows a schematic diagram of an imaging lens module according to a first embodiment of the first embodiment of the present disclosure; Figure 1B shows a side view of a plastic optical transition element according to Figure 1A of the first embodiment; Figure 1C shows a perspective view of the plastic optical transition element according to Figure 1B; Figure 1D shows another perspective view of the plastic optical transition element according to Figure 1B; Figure 1E shows a schematic diagram of a reflective film according to Figure 1B; Figure 1F shows a schematic diagram of a first multilayer film according to Figure 1E; Figure 1G shows a schematic diagram of a second multilayer film according to Figure 1E; Figure 1H shows the reflectivity of the first and second sides of the reflective film in Figure 1D; Figure 1I shows a perspective view of a plastic optical transition element according to a second embodiment of the present disclosure; Figure 2A shows a schematic diagram of an imaging lens module according to a second embodiment of the present disclosure; Figure 2B shows a side view of a plastic optical transition element according to Figure 2A of the first embodiment of the second embodiment; Figure 2C shows a perspective view of the plastic optical transition element according to Figure 2B; Figure 2D shows a schematic diagram of the reflective film according to Figure 2B; Figure 2E shows a schematic diagram of the first multilayer film according to Figure 2D; Figure 2F shows a schematic diagram of the second multilayer film according to Figure 2D; Figure 2G shows the reflectivity of the first and second sides of the reflective film in Figure 2C; Figure 3A shows a schematic diagram of the imaging lens module according to the first embodiment of the third embodiment of this disclosure; Figure 3B shows a side view of the plastic optical transition element according to the first embodiment of the third embodiment of Figure 3A; Figure 3C shows a perspective view of the plastic optical transition element according to Figure 3B; Figure 3D shows a schematic diagram of the reflective film according to Figure 3B; Figure 3E shows a schematic diagram of the first multilayer film according to Figure 3D; Figure 3F shows a schematic diagram of the second multilayer film according to Figure 3D; Figure 4A shows a schematic diagram of the electronic device according to the fourth embodiment of this disclosure; Figure 4B shows another schematic diagram of the electronic device according to the fourth embodiment of Figure 4A. Figure 4C illustrates a schematic diagram of an image captured by an electronic device according to the fourth embodiment of Figure 4A; Figure 4D illustrates another schematic diagram of an image captured by an electronic device according to the fourth embodiment of Figure 4A; Figure 4E illustrates another schematic diagram of an image captured by an electronic device according to the fourth embodiment of Figure 4A; and Figure 5 illustrates a schematic diagram of an electronic device according to the fifth embodiment of this disclosure.

Claims

1. A plastic optical reversing element, comprising: an incident surface through which light enters the plastic optical reversing element; at least one reflecting surface for changing the direction of travel of the light; an exiting surface through which the light exits the plastic optical reversing element; and a reflective film disposed on the at least one reflecting surface, a bottom of the reflective film being in solid contact with the at least one reflecting surface, a top of the reflective film being disposed opposite to the bottom, the reflective film sequentially comprising, from the bottom toward the top away from the at least one reflecting surface: a first multilayer film comprising at least one first low refractive index layer and at least one first high refractive index layer, the refractive index of the at least one first high refractive index layer being higher than the refractive index of the at least one first low refractive index layer, and the at least one first high refractive index layer and the at least one first low refractive index layer being alternately stacked; a first connecting layer comprising aluminum oxide; and a first silver atom layer comprising silver. An insulating layer comprising at least one of nickel, titanium, vanadium, chromium, nickel oxide, titanium oxide, vanadium oxide, and chromium oxide; and a second multilayer film comprising at least one second low-refractive-index layer and at least one second high-refractive-index layer, wherein the refractive index of the at least one second high-refractive-index layer is higher than the refractive index of the at least one second low-refractive-index layer, and the at least one second high-refractive-index layer and the at least one second low-refractive-index layer are alternately stacked; wherein... The thickness of the first multilayer film is Dmf1, the thickness of the insulating layer is Db, and the distance between the first silver atom layer and the bottom is Hag1, which satisfies the following conditions: 70 nm < Dmf1 < 420 nm; 20 nm < Db < 180 nm; and 90 nm < Hag1 < 550 nm.

2. The plastic optical switching element as claimed in claim 1, wherein the reflective film further comprises: a second silver atom layer comprising silver, located between the insulating layer and the second multilayer film, and being located away from the at least one reflective surface relative to the insulating layer, and in solid contact with the insulating layer; and a second connecting layer comprising aluminum oxide, located away from the at least one reflective surface relative to the second silver atom layer, and in solid contact with the second silver atom layer.

3. The plastic optical switching element as claimed in claim 2, wherein the number of layers of the reflective film and the layer materials of the reflective film are arranged symmetrically about the insulating layer.

4. The plastic optical transition element as claimed in claim 2, wherein at least one of the incident surface, the exit surface, and the at least one reflecting surface has a curvature.

5. The plastic optical reflex element as claimed in claim 2, wherein the number of the at least one reflective surface is at least two.

6. The plastic optical transition element as claimed in claim 2, wherein the distance between the second silver atom layer and the top is Hag2, which satisfies the following condition: 60 nm < Hag2 < 480 nm.

7. The plastic optical transition element as claimed in claim 1, wherein the distance between the first silver atom layer and the bottom is Hag1, which satisfies the following condition: 180 nm < Hag1 < 460 nm.

8. The plastic optical switching element as claimed in claim 1, wherein the thickness of the insulating layer is Db, which satisfies the following condition: 35 nm < Db < 120 nm.

9. The plastic optical switching element as claimed in claim 1, wherein an average reflectance of the reflective film in the corresponding wavelength band of 400 nm to 1000 nm is measured from the bottom, the average reflectance being R1, which satisfies the following condition: 85% < R1 < 100%.

10. The plastic optical switching element as claimed in claim 1, wherein an average reflectance of the reflective film in the corresponding wavelength band of 400 nm to 1000 nm is measured from the top, the average reflectance being R2, which satisfies the following condition: 95% < R2 < 100%.

11. The plastic optical switching element as claimed in claim 1, wherein the insulating layer is primarily made of nickel.

12. The plastic optical transition element as claimed in claim 1, further comprising: a plurality of connecting surfaces connecting the incident surface, the exit surface, and the at least one reflecting surface, wherein the at least one reflecting surface has a step structure with one of the adjacent connecting surfaces, the step structure creating a height difference, Hs, between the at least one reflecting surface and the connecting surface, the height difference satisfying the following condition: 0.005 mm ≤ Hs ≤ 0.22 mm.

13. A plastic optical reversing element, comprising: an incident surface through which light enters the plastic optical reversing element; at least one reflecting surface for changing the direction of travel of the light; an exiting surface through which the light exits the plastic optical reversing element; and a reflective film disposed on the at least one reflecting surface, a bottom of the reflective film being in solid contact with the at least one reflecting surface, a top of the reflective film being disposed opposite to the bottom, the reflective film sequentially comprising, from the bottom toward the top away from the at least one reflecting surface: a first multilayer film comprising at least one first low refractive index layer and at least one first high refractive index layer, the refractive index of the at least one first high refractive index layer being higher than the refractive index of the at least one first low refractive index layer, and the at least one first high refractive index layer and the at least one first low refractive index layer being alternately stacked; and a first connecting layer comprising aluminum oxide. A first silver atom layer comprising silver; and an insulating layer comprising at least one of nickel, titanium, vanadium, chromium, nickel oxide, titanium oxide, vanadium oxide, and chromium oxide; wherein... The thickness of the first multilayer film is Dmf1, the thickness of the insulating layer is Db, and the distance between the first silver atom layer and the at least one reflective surface is Hag1, which satisfies the following conditions: 0.1 < Db / Dmf1 < 0.9; 70 nm < Dmf1 < 420 nm; and 90 nm < Hag1 < 550 nm.

14. The plastic optical switching element as claimed in claim 13, wherein the reflective film further comprises: a second silver atom layer comprising silver, which is located away from the at least one reflective surface relative to the insulating layer and is in solid contact with the insulating layer.

15. The plastic optical reflex element as claimed in claim 14, wherein at least one of the incident surface, the exit surface, and the at least one reflecting surface has a curvature.

16. The plastic optical reflex element as claimed in claim 14, wherein the number of the at least one reflective surface is at least two.

17. The plastic optical transition element as claimed in claim 13, wherein the distance between the first silver atom layer and the bottom is Hag1, which satisfies the following condition: 180 nm < Hag1 < 460 nm.

18. The plastic optical transition element as claimed in claim 13, wherein the thickness of the insulating layer is Db, which satisfies the following condition: 35 nm < Db < 120 nm.

19. The plastic optical transition element as claimed in claim 18, wherein the thickness of the first multilayer film is Dmf1 and the thickness of the insulating layer is Db, which satisfy the following condition: 0.1 < Db / Dmf1 < 0.

4.

20. The plastic optical switching element as claimed in claim 13, wherein an average reflectance of the reflective film in the corresponding wavelength band of 400 nm to 1000 nm is measured from the bottom, the average reflectance being R1, which satisfies the following condition: 85% < R1 < 100%.

21. The plastic optical switching element as claimed in claim 14, wherein an average reflectance of the reflective film in the corresponding wavelength band of 400 nm to 1000 nm is measured from the top, the average reflectance being R2, which satisfies the following condition: 95% < R2 < 100%.

22. The plastic optical switching element as claimed in claim 13, wherein the insulating layer is primarily made of nickel.

23. The plastic optical transition element as claimed in claim 13 further comprises: a plurality of connecting surfaces connecting the incident surface, the exit surface and the at least one reflecting surface, wherein the at least one reflecting surface has a step structure with one of the adjacent connecting surfaces, the step structure forming a height difference Hs between the at least one reflecting surface and the connecting surface, the height difference satisfying the following condition: 0.005 mm ≤ Hs ≤ 0.22 mm.

24. An imaging lens module comprising: a plastic optical transition element as described in claim 1 or 13.

25. An electronic device comprising: an imaging lens module as described in claim 24.

Images