Optical lens, image capturing device and electronic device

Abstract

The utility model provides an optical lens, an image capturing device and an electronic device, the optical lens comprises at least four optical lenses, and at least one of the at least four optical lenses is a filtering lens. The filtering lens is provided with a near-infrared light filtering coating film, and the near-infrared light filtering coating film is formed by alternately stacking high-refractive-index film layers and low-refractive-index film layers. Therefore, according to the optical lens disclosed by the invention, the near-infrared light filtering coating film is arranged on the optical lens, so that the number of optical elements can be reduced, near-infrared light can be effectively filtered, the difference of penetration rates of various angles and color cast can be reduced, and the deformation of the lens can be reduced.

Description

Technical Field

[0001] The present disclosure relates to an optical lens, an imaging device and an electronic device, and more particularly to an optical lens, an imaging device and an electronic device comprising a filter lens having a near-infrared light filtering coating. Background Art

[0002] The traditional near-infrared light filtering technology is to set a reflective filter and an absorptive filter between the last optical lens and the imaging surface. However, the reflective filter has obvious differences in transmittance for incident light at different angles and cannot effectively filter out near-infrared light incident at large angles. The absorptive filter is likely to absorb the red light in the visible light and produce image color deviation. In addition, setting the filter between the last optical lens and the imaging surface will increase the back focal length, resulting in an increase in the volume of the optical lens, which is not conducive to lens miniaturization.

[0003] Therefore, in view of the aforementioned defects of traditional near-infrared light filtering technology and the increased cost caused by the large number of optical components, it is necessary to actively develop a new near-infrared light filtering technology with fewer filters and low transmittance differences at all angles, low color deviation and low cost. Utility Model Content

[0004] The optical lens, imaging device and electronic device provided by the present disclosure include at least four optical lenses, at least one of the at least four optical lenses is a filter lens, the filter lens has a near-infrared light filter coating, the near-infrared light filter coating has at least one low refractive index film layer and at least one high refractive index film layer, and the near-infrared light filter coating is a high refractive index film layer and a low refractive index film layer alternately stacked, so that the number of optical elements can be reduced and near-infrared light can be effectively filtered out, the difference in transmittance at each angle and color deviation can be reduced, and the lens deformation can be reduced. Furthermore, by limiting the wavelength of the filter lens at 50% transmittance of long-wavelength visible light, excessive red light can be avoided from being filtered out, which helps to improve the red saturation of the image; by limiting the wavelength difference of the filter lens at 0 degrees and 30 degrees of incidence at 50% transmittance of long-wavelength visible light, the difference in transmittance at each angle can be reduced, which helps to reduce stray light; and by limiting the average transmittance of the filter lens at a wavelength of 700nm to 1050nm, it helps to reduce the interference of the near-infrared light band on imaging.

[0005] According to the present disclosure, an optical lens is provided, characterized in that it includes at least four optical lenses, and the at least four optical lenses are respectively a first optical lens, a second optical lens, a third optical lens, and a fourth optical lens from the object side to the image side of the optical lens. At least one of the at least four optical lenses is a filter lens, and the filter lens has a near-infrared light filtering coating, the filter lens is made of glass, and the filter lens has at least one aspherical surface. The near-infrared light filtering coating has at least one low refractive index film layer and at least one high refractive index film layer, and the near-infrared light filtering coating is a high refractive index film layer and a low refractive index film layer alternately stacked. The wavelength of the filter lens at 50% transmittance of long-wavelength visible light is Wt50v, the wavelength difference between 0 degree and 30 degree incidence at 50% transmittance of long-wavelength visible light of the filter lens is dWt50v3, the average transmittance of the filter lens at a wavelength of 600nm to 650nm is T6065, and the average transmittance of the filter lens at a wavelength of 700nm to 1050nm is T70105, which satisfies the following conditions: 650nm≤Wt50v; |dWt50v3|≤20nm; 90%≤T6065; and T70105≤5%.

[0006] The optical lens according to the aforementioned embodiment is characterized in that the total number of layers of the near-infrared light filtering coating is tLs, which can meet the following condition: 40≤tLs≤200.

[0007] The optical lens according to the aforementioned embodiment is characterized in that the total thickness of the near-infrared light filtering coating is tTk, which can satisfy the following condition: 4000nm≤tTk≤10000nm.

[0008] The optical lens according to the aforementioned embodiment is characterized in that the total thickness of the low refractive index film layer is LtTk, and the total thickness of the high refractive index film layer is HtTk, which can satisfy the following condition: 1.0≤LtTk / HtTk≤2.0.

[0009] The optical lens according to the aforementioned embodiment is characterized in that the near-infrared light filtering coating is arranged on the object side surface and the image side surface of the filtering lens, the total number of layers of the near-infrared light filtering coating on the object side surface of the filtering lens is otLs, and the total number of layers of the near-infrared light filtering coating on the image side surface of the filtering lens is itLs, which can satisfy the following conditions: otLs≤40; and itLs≤40.

[0010] The optical lens according to the aforementioned embodiment is characterized in that the total thickness of the near-infrared light filtering coating on the object side surface of the filtering lens is otTk, and the total thickness of the near-infrared light filtering coating on the image side surface of the filtering lens is itTk, which can satisfy the following condition: 0.1≤otTk / itTk≤10.

[0011] The optical lens according to the aforementioned embodiment is characterized in that the refractive index of the high refractive index film layer is NH, and the refractive index of the low refractive index film layer is NL, which can satisfy the following condition: 0.5≤NH-NL.

[0012] The optical lens according to the aforementioned embodiment is characterized in that, when the filter lens has a 50% transmittance of long-wavelength visible light, the wavelength difference between 0 degree and 40 degree incidence is dWt50v4, which can satisfy the following condition: |dWt50v4|≤40nm.

[0013] The optical lens according to the aforementioned embodiment is characterized in that the average transmittance of the filter lens at a wavelength of 350nm to 400nm is T3540, which can meet the following condition: T3540≤3%.

[0014] The optical lens according to the aforementioned embodiment is characterized in that the transmittance of the filter lens at a wavelength of 850 nm is T85, which can meet the following condition: T85≤3%.

[0015] The optical lens according to the aforementioned embodiment is characterized in that the transmittance of the filter lens at a wavelength of 940 nm is T94, which can meet the following condition: T94≤3%.

[0016] According to the optical lens of the aforementioned embodiment, it is characterized in that the near-infrared light filtering coating can be disposed on the image side surface of the filtering lens.

[0017] According to the optical lens of the aforementioned embodiment, it is characterized in that the filter lens can be the first optical lens.

[0018] The optical lens according to the aforementioned embodiment is characterized in that the horizontal displacement of the filter lens at the maximum effective diameter position is SAG, and the center thickness of the filter lens is CT, which can satisfy the following condition: |SAG / CT|≤0.7.

[0019] The optical lens according to the aforementioned embodiment is characterized in that the horizontal displacement of the filter lens at the maximum effective diameter position is SAG, and the curvature radius of the filter lens at the center position is Rc, which can satisfy the following condition: |SAG / Rc|≤0.1.

[0020] According to the present disclosure, an image capturing device is provided, comprising the optical lens as described in the previous paragraph and an electronic photosensitive element. The electronic photosensitive element is disposed on an imaging surface of the optical lens.

[0021] According to the present disclosure, an electronic device is provided, comprising the imaging device as described in the preceding paragraph.

[0022] According to the present disclosure, an optical lens is provided, comprising at least four optical lenses, wherein the at least four optical lenses are respectively a first optical lens, a second optical lens, a third optical lens and a fourth optical lens from the object side to the image side of the optical lens. At least one of the at least four optical lenses is a filter lens, the filter lens has a near-infrared light filtering coating, and at least one of the at least four optical lenses comprises a blue glass material. The near-infrared light filtering coating has at least one low refractive index film layer and at least one high refractive index film layer, and the near-infrared light filtering coating is a high refractive index film layer and a low refractive index film layer alternately stacked. The wavelength of the filter lens at 50% transmittance of long-wavelength visible light is Wt50v, the wavelength difference between 0 degree and 30 degree incidence at 50% transmittance of long-wavelength visible light is dWt50v3, the average transmittance of the filter lens at a wavelength of 450nm to 630nm is T4563, and the average transmittance of the filter lens at a wavelength of 700nm to 1050nm is T70105, which satisfies the following conditions: 650nm≤Wt50v; |dWt50v3|≤20nm; 85%≤T4563; and T70105≤3%.

[0023] The optical lens according to the aforementioned embodiment is characterized in that the total thickness of the low refractive index film layer is LtTk, and the total thickness of the high refractive index film layer is HtTk, which can satisfy the following condition: 1.4≤LtTk / HtTk.

[0024] The optical lens according to the aforementioned embodiment is characterized in that the total number of layers of the near-infrared light filtering coating is tLs, which can satisfy the following condition: 65≤tLs.

[0025] The optical lens according to the aforementioned embodiment is characterized in that the total thickness of the near-infrared light filtering coating is tTk, which can meet the following condition: tTk≤6500nm.

[0026] The optical lens according to the aforementioned embodiment is characterized in that, when the filter lens has a 50% transmittance of long-wavelength visible light, the wavelength difference between 0 degree and 40 degree incidence is dWt50v4, which can satisfy the following condition: |dWt50v4|≤40nm.

[0027] The optical lens according to the aforementioned embodiment is characterized in that the average transmittance of the filter lens at a wavelength of 450nm to 630nm is T4563, which can meet the following condition: 70%≤T4563.

[0028] The optical lens according to the aforementioned embodiment is characterized in that the transmittance of the filter lens at a wavelength of 450 nm is T45, which can meet the following condition: 80% ≤ T45.

[0029] The optical lens according to the aforementioned embodiment is characterized in that the transmittance of the filter lens at a wavelength of 500 nm is T50, which can meet the following condition: 80%≤T50.

[0030] The optical lens according to the aforementioned embodiment is characterized in that the transmittance of the filter lens at a wavelength of 630 nm is T63, which can meet the following condition: 80%≤T63.

[0031] According to the optical lens of the aforementioned embodiment, it is characterized in that the near infrared light filtering coating is disposed on the image side surface of the filtering lens, and the filtering lens may include a blue glass material.

[0032] The optical lens according to the aforementioned embodiment is characterized in that the total number of near-infrared light filtering coating layers is tLs, the total thickness of the near-infrared light filtering coating is tTk, the total thickness of the low refractive index film layer is LtTk, the total thickness of the high refractive index film layer is HtTk, the wavelength of the filtering lens at 50% transmittance of long-wavelength visible light is Wt50v, the wavelength difference between 0 degrees and 30 degrees incident on the filtering lens at 50% transmittance of long-wavelength visible light is dWt50v3, the wavelength difference between 0 degrees and 40 degrees incident on the filtering lens at 50% transmittance of long-wavelength visible light is dWt50v4, the average transmittance of the filtering lens at a wavelength of 450nm to 630nm is T4563, the average transmittance of the filtering lens at a wavelength of 600nm to 650nm is T6065, and the filtering lens The average transmittance at a wavelength of 700nm to 1050nm is T70105, the horizontal displacement of the filter lens at the maximum effective diameter position is SAG, the center thickness of the filter lens is CT, and the radius of curvature of the filter lens at the center position is Rc, which can meet the following conditions: 65≤tLs≤100; 6000nm≤tTk≤6200nm; 1.4≤LtTk / HtTk≤1.6; 670nm≤Wt50v≤690nm; 0≤|dWt50v3|≤15nm; 0≤|dWt50v4|≤35nm; 95%≤T4563≤100%; 95%≤T6065≤100%; 0%≤T70105≤1%; |SAG / CT|≤0.2; and |SAG / Rc|≤0.02.

[0033] According to the present disclosure, there is also provided an image capturing device, comprising the optical lens as described in the previous paragraph and an electronic photosensitive element. The electronic photosensitive element is disposed on an imaging surface of the optical lens.

[0034] According to the present disclosure, an electronic device is further provided, comprising the imaging device as described in the preceding paragraph. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to make the above and other objects, features, advantages and embodiments of the present disclosure more clearly understood, the accompanying drawings are described as follows:

[0036] Figure 1 is a graph showing the relationship between the transmittance of the filter lens and the wavelength in the optical lens of the first embodiment of the present disclosure;

[0037] Figure 2 is a graph showing the relationship between the transmittance of the filter lens and the wavelength in the optical lens of the second embodiment of the present disclosure;

[0038] Figure 3 is a graph showing the relationship between the transmittance of the filter lens and the wavelength in the optical lens of the third embodiment of the present disclosure;

[0039] Figure 4 is a graph showing the relationship between the transmittance of the filter lens and the wavelength in the optical lens of the fourth embodiment of the present disclosure;

[0040] Figure 5 is a graph showing the relationship between the transmittance of the filter lens and the wavelength in the optical lens of the fifth embodiment of the present disclosure;

[0041] Figure 6 is a graph showing the relationship between the transmittance of the filter lens and the wavelength in the optical lens of the sixth embodiment of the present disclosure;

[0042] Figure 7 is a graph showing the relationship between the transmittance of the filter lens and the wavelength in the optical lens of the seventh embodiment of the present disclosure;

[0043] Figure 8 is a graph showing the relationship between the transmittance of the filter lens and the wavelength in the optical lens of the eighth embodiment of the present disclosure;

[0044] Fig. 9 is a graph showing the relationship between the transmittance of the filter lens and the wavelength in the optical lens of the ninth embodiment of the present disclosure;

[0045] Fig.10 is a graph showing the relationship between the transmittance of the filter lens and the wavelength in the optical lens of the tenth embodiment of the present disclosure;

[0046] Fig.11 is a graph showing the relationship between the transmittance and wavelength of the optical lens of the eleventh embodiment of the present disclosure; and

[0047] Fig.12 FIG. 1 is a graph showing the relationship between the transmittance and wavelength of the optical lens according to the twelfth embodiment of the present disclosure.

[0048]

Explanation of symbols

[0049] tLs: Total number of layers of near-infrared light filtering coating

[0050] otLs: Total number of layers of near-infrared light filtering coating on the object side surface of the filter lens

[0051] itLs: Total number of layers of near-infrared light filtering coating on the image side surface of the filter lens

[0052] tTk: Total thickness of near-infrared light filtering coating

[0053] LtTk: Total thickness of low refractive index film layer

[0054] HtTk: Total thickness of high refractive index film layer

[0055] otTk: Total thickness of the near-infrared light filter coating on the object side surface of the filter lens

[0056] itTk: Total thickness of the near-infrared light filter coating on the image side surface of the filter lens

[0057] NH: refractive index of high refractive index film

[0058] NL: refractive index of the low refractive index film layer

[0059] Wt50v: The wavelength at which the filter lens has 50% transmittance of long-wavelength visible light

[0060] dWt50v3: The wavelength difference between 0 and 30 degrees when the filter lens has 50% transmittance of long wavelength visible light

[0061] dWt50v4: The wavelength difference between 0 and 40 degrees when the filter lens has 50% transmittance of long wavelength visible light

[0062] T3540: filter lens at the wavelength of 350nm to 400nm average transmittance

[0063] T4563: Average transmittance of filter lens at wavelengths from 450nm to 630nm

[0064] T6065: filter lens at the wavelength of 600nm to 650nm average transmittance

[0065] T70105: Average transmittance of filter lens at wavelengths from 700nm to 1050nm

[0066] T45: filter lens transmittance at wavelength 450nm

[0067] T50: filter lens transmittance at a wavelength of 500nm

[0068] T63: filter lens transmittance at wavelength 630nm

[0069] T85: filter lens transmittance at wavelength 850nm

[0070] T94: filter lens transmittance at wavelength 940nm

[0071] SAG: Horizontal displacement of the filter lens at the maximum effective diameter position

[0072] CT: Center thickness of the filter lens

[0073] Rc: The radius of curvature of the filter lens at the center DETAILED DESCRIPTION

[0074] An embodiment of one aspect of the present disclosure provides an optical lens, comprising at least four optical lenses, wherein the at least four optical lenses are respectively a first optical lens, a second optical lens, a third optical lens, and a fourth optical lens from the object side to the image side of the optical lens. At least one of the at least four optical lenses is a filtering lens, and the filtering lens has a near-infrared light filtering coating, the filtering lens is made of glass, and the filtering lens has at least one aspherical surface. The near-infrared light filtering coating has at least one low refractive index film layer and at least one high refractive index film layer, and the near-infrared light filtering coating is a high refractive index film layer and a low refractive index film layer alternately stacked. Thus, by setting a near-infrared light filtering coating on a lens made of glass, the number of optical elements can be reduced, near-infrared light can be effectively filtered out, the difference in transmittance at each angle and color deviation can be reduced, and lens deformation can be reduced.

[0075] Another embodiment of the present disclosure provides an optical lens, comprising at least four optical lenses, wherein the at least four optical lenses are respectively a first optical lens, a second optical lens, a third optical lens and a fourth optical lens from the object side to the image side of the optical lens. At least one of the at least four optical lenses is a filter lens, the filter lens has a near-infrared light filtering coating, and at least one of the at least four optical lenses comprises a blue glass material. The near-infrared light filtering coating has at least one low refractive index film layer and at least one high refractive index film layer, and the near-infrared light filtering coating is a high refractive index film layer and a low refractive index film layer alternately stacked. Thus, by combining the near-infrared light filtering coating and the blue glass material in the optical lens, the number of optical elements can be reduced, the near-infrared light can be effectively filtered out, and the difference in transmittance at each angle can be reduced.

[0076] The wavelength of the filter lens at 50% transmittance of long-wavelength visible light is Wt50v, which can meet the following conditions: 650nm≤Wt50v. By limiting the wavelength of the filter lens at 50% transmittance of long-wavelength visible light, it is possible to avoid filtering out too much red light, which helps to improve the red saturation of the image. Alternatively, it can meet the following conditions: 655nm≤Wt50v≤700nm. Alternatively, it can meet the following conditions: 660nm≤Wt50v≤695nm. Alternatively, it can meet the following conditions: 665nm≤Wt50v≤690nm. Alternatively, it can meet the following conditions: 675nm≤Wt50v≤685nm. Alternatively, it can meet the following conditions: 677.5nm≤Wt50v≤682.5nm.

[0077] The wavelength difference between 0 and 30 degrees of the filter lens at 50% transmittance of long-wavelength visible light is dWt50v3, which can meet the following conditions: |dWt50v3|≤20nm. Thus, by limiting the wavelength difference between 0 and 30 degrees of the filter lens at 50% transmittance of long-wavelength visible light, the difference in transmittance at each angle can be reduced, which helps to reduce stray light. Alternatively, it can meet the following conditions: |dWt50v3|≤18nm. Alternatively, it can meet the following conditions: |dWt50v3|≤15nm. Alternatively, it can meet the following conditions: 0nm≤|dWt50v3|≤12nm. Alternatively, it can meet the following conditions: 0nm≤|dWt50v3|≤15nm.

[0078] The average transmittance of the filter lens at a wavelength of 600nm to 650nm is T6065, which can meet the following conditions: 90% ≤ T6065. Thus, by controlling the average transmittance of the filter lens at a wavelength of 600nm to 650nm, good penetration of red light is ensured, which helps to avoid imaging color deviation caused by insufficient red light. Alternatively, it can meet the following conditions: 70% ≤ T6065. Alternatively, it can meet the following conditions: 75% ≤ T6065. Alternatively, it can meet the following conditions: 80% ≤ T6065. Alternatively, it can meet the following conditions: 85% ≤ T6065. Alternatively, it can meet the following conditions: 95% ≤ T6065 ≤ 100%.

[0079] The average transmittance of the filter lens at a wavelength of 700nm to 1050nm is T70105, which can meet the following conditions: T70105≤5%. In this way, by limiting the average transmittance of the filter lens at a wavelength of 700nm to 1050nm, it helps to reduce the interference of the near-infrared light band on imaging. Alternatively, it can meet the following conditions: T70105≤4%. Alternatively, it can meet the following conditions: T70105≤3%. Alternatively, it can meet the following conditions: T70105≤2%. Alternatively, it can meet the following conditions: T70105≤1%. Alternatively, it can meet the following conditions: 0%≤T70105≤0.5%. Alternatively, it can meet the following conditions: 0%≤T70105≤1%.

[0080] The average transmittance of the filter lens at a wavelength of 450nm to 630nm is T4563, which can meet the following conditions: 85% ≤ T4563. In this way, by meeting the average transmittance of the filter lens at a wavelength of 450nm to 630nm, high penetration of visible light is ensured, which helps to improve imaging quality. Alternatively, it can meet the following conditions: 70% ≤ T4563. Alternatively, it can meet the following conditions: 75% ≤ T4563. Alternatively, it can meet the following conditions: 80% ≤ T4563. Alternatively, it can meet the following conditions: 90% ≤ T4563. Alternatively, it can meet the following conditions: 95% ≤ T4563 ≤ 100%.

[0081] The total number of layers of the near-infrared light filtering coating is tLs, which may satisfy the following conditions: 40≤tLs≤200. By controlling the total number of layers of the near-infrared light filtering coating, it is helpful to improve the penetration effect of visible light and avoid excessive lens deformation caused by too many layers of coating. Alternatively, it may satisfy the following conditions: 50≤tLs≤180. Alternatively, it may satisfy the following conditions: 55≤tLs≤160. Alternatively, it may satisfy the following conditions: 60≤tLs≤120. Alternatively, it may satisfy the following conditions: 65≤tLs≤100. Alternatively, it may satisfy the following conditions: 70≤tLs≤90. Alternatively, it may satisfy the following conditions: 75≤tLs≤80. Alternatively, it may satisfy the following conditions: 65≤tLs.

[0082] The total thickness of the near-infrared light filtering coating is tTk, which can meet the following conditions: 4000nm≤tTk≤10000nm. By controlling the total thickness of the near-infrared light filtering coating, it helps to maintain the integrity of the overall coating and achieve the best near-infrared light filtering effect. Alternatively, it can meet the following conditions: 4500nm≤tTk≤9000nm. Alternatively, it can meet the following conditions: 5000nm≤tTk≤8000nm. Alternatively, it can meet the following conditions: 5500nm≤tTk≤7000nm. Alternatively, it can meet the following conditions: 6000nm≤tTk≤6500nm. Alternatively, it can meet the following conditions: 6000nm≤tTk≤6200nm. Alternatively, it can meet the following conditions: tTk≤6500nm.

[0083] The total thickness of the low refractive index film layer is LtTk, and the total thickness of the high refractive index film layer is HtTk, which may satisfy the following conditions: 1.0≤LtTk / HtTk≤2.0. By controlling the ratio of the thickness of the low refractive index film layer to the thickness of the high refractive index film layer, it helps to reduce the difference in transmittance of the wavelength of 50% transmittance of visible light at each angle. Alternatively, it may satisfy the following conditions: 1.1≤LtTk / HtTk≤1.9. Alternatively, it may satisfy the following conditions: 1.2≤LtTk / HtTk≤1.8. Alternatively, it may satisfy the following conditions: 1.3≤LtTk / HtTk≤1.7. Alternatively, it may satisfy the following conditions: 1.4≤LtTk / HtTk≤1.6. Alternatively, it may satisfy the following conditions: 1.45≤LtTk / HtTk≤1.55. Alternatively, it may satisfy the following conditions: 1.4≤LtTk / HtTk.

[0084] The near-infrared light filtering coating can be disposed on the object side surface and the image side surface of the filtering lens. The total number of layers of the near-infrared light filtering coating on the object side surface of the filtering lens is otLs, which can meet the following conditions: otLs≤40. By limiting the total number of layers of the near-infrared light filtering coating on the object side surface of the filtering lens, it helps to reduce the deformation of the object side surface of the filtering lens. Alternatively, it can meet the following conditions: otLs≤39. Alternatively, it can meet the following conditions: otLs≤37.

[0085] The near-infrared light filtering coating can be provided on the object side surface and the image side surface of the filtering lens. The total number of layers of the near-infrared light filtering coating on the image side surface of the filtering lens is itLs, which can meet the following conditions: itLs≤40. By limiting the total number of layers of the near-infrared light filtering coating on the image side surface of the filtering lens, it helps to reduce the deformation of the image side surface of the filtering lens. Alternatively, it can meet the following conditions: itLs≤39. Alternatively, it can meet the following conditions: itLs≤38. Alternatively, it can meet the following conditions: itLs≤37.

[0086] The total thickness of the near-infrared light filtering film on the object side surface of the filter lens is otTk, and the total thickness of the near-infrared light filtering film on the image side surface of the filter lens is itTk, which can meet the following conditions: 0.1≤otTk / itTk≤10. By controlling the total thickness ratio of the near-infrared light filtering film on the object side surface of the filter lens and on the image side surface of the filter lens, the lens deformation caused by excessive single-side coating times can be reduced. Alternatively, it can meet the following conditions: 0.2≤otTk / itTk≤5. Alternatively, it can meet the following conditions: 0.3≤otTk / itTk≤3.5. Alternatively, it can meet the following conditions: 0.4≤otTk / itTk≤2.5. Alternatively, it can meet the following conditions: 0.5≤otTk / itTk≤2. Alternatively, it can meet the following conditions: 0.6≤otTk / itTk≤1.67. Alternatively, it may satisfy the following condition: 0.70≤otTk / itTk≤1.43.

[0087] The refractive index of the high refractive index film layer is NH, and the refractive index of the low refractive index film layer is NL, which can meet the following conditions: 0.5≤NH-NL. By meeting the specific refractive index difference of the film layer, it helps to improve the filtering effect of near-infrared light. Alternatively, it can meet the following conditions: 0.6≤NH-NL. Alternatively, it can meet the following conditions: 0.7≤NH-NL. Alternatively, it can meet the following conditions: 0.8≤NH-NL. Alternatively, it can meet the following conditions: 0.85≤NH-NL.

[0088] The wavelength difference between 0 and 40 degrees incident on the filter lens at 50% transmittance of long-wavelength visible light is dWt50v4, which can meet the following conditions: |dWt50v4|≤40nm. By limiting the wavelength difference between 0 and 40 degrees incident on the filter lens at 50% transmittance of long-wavelength visible light, the difference in transmittance at each angle can be further reduced, which helps to further reduce stray light. Alternatively, it can meet the following conditions: |dWt50v4|≤45nm. Alternatively, it can meet the following conditions: |dWt50v4|≤35nm. Alternatively, it can meet the following conditions: 0nm≤|dWt50v4|≤30nm. Alternatively, it can meet the following conditions: 0nm≤|dWt50v4|≤35nm.

[0089] The average transmittance of the filter lens at a wavelength of 350nm to 400nm is T3540, which can meet the following conditions: T3540≤3%. By limiting the average transmittance of the filter lens at a wavelength of 350nm to 400nm, low penetration of ultraviolet light is ensured, which helps to reduce the interference of ultraviolet light on imaging. Alternatively, it can meet the following conditions: T3540≤10%. Alternatively, it can meet the following conditions: T3540≤8%. Alternatively, it can meet the following conditions: T3540≤5%. Alternatively, it can meet the following conditions: T3540≤1%. Alternatively, it can meet the following conditions: 0%≤T3540≤0.5%.

[0090] The transmittance of the filter lens at a wavelength of 850nm is T85, which can meet the following conditions: T85≤3%. By limiting the transmittance of the filter lens at a wavelength of 850nm, the common wavelength near-infrared light can be reduced, which helps to reduce the red interference of near-infrared light on imaging. Alternatively, it can meet the following conditions: T85≤10%. Alternatively, it can meet the following conditions: T85≤8%. Alternatively, it can meet the following conditions: T85≤5%. Alternatively, it can meet the following conditions: T85≤1%. Alternatively, it can meet the following conditions: 0%≤T85≤0.5%.

[0091] The transmittance of the filter lens at a wavelength of 940nm is T94, which can meet the following conditions: T94≤3%. By limiting the transmittance of the filter lens at a wavelength of 940nm, the common wavelength near-infrared light can be reduced, which helps to reduce the black interference of near-infrared light on imaging. Alternatively, it can meet the following conditions: T94≤10%. Alternatively, it can meet the following conditions: T94≤8%. Alternatively, it can meet the following conditions: T94≤5%. Alternatively, it can meet the following conditions: T94≤1%. Alternatively, it can meet the following conditions: 0%≤T94≤0.5%.

[0092] The transmittance of the filter lens at a wavelength of 450nm is T45, which can meet the following conditions: 80% ≤ T45. By meeting the transmittance of the filter lens at a wavelength of 450nm, it is ensured that the blue light has excellent penetration effect, which helps to improve the blue light imaging effect. Alternatively, it can meet the following conditions: 70% ≤ T45. Alternatively, it can meet the following conditions: 85% ≤ T45. Alternatively, it can meet the following conditions: 90% ≤ T45. Alternatively, it can meet the following conditions: 95% ≤ T45 ≤ 100%.

[0093] The transmittance of the filter lens at a wavelength of 500nm is T50, which can meet the following conditions: 80% ≤ T50. By meeting the transmittance of the filter lens at a wavelength of 500nm, it is ensured that the green light has excellent penetration effect, which helps to improve the green light imaging effect. Alternatively, it can meet the following conditions: 70% ≤ T50. Alternatively, it can meet the following conditions: 85% ≤ T50. Alternatively, it can meet the following conditions: 90% ≤ T50. Alternatively, it can meet the following conditions: 95% ≤ T50 ≤ 100%.

[0094] The transmittance of the filter lens at a wavelength of 630nm is T63, which can meet the following conditions: 80% ≤ T63. By meeting the transmittance of the filter lens at a wavelength of 630nm, it is ensured that the red light has excellent penetration effect, which helps to improve the red light imaging effect. Alternatively, it can meet the following conditions: 70% ≤ T63. Alternatively, it can meet the following conditions: 85% ≤ T63. Alternatively, it can meet the following conditions: 90% ≤ T63. Alternatively, it can meet the following conditions: 95% ≤ T63 ≤ 100%.

[0095] According to the optical lens disclosed herein, the near-infrared light filtering coating can be disposed on the image side surface of the filtering lens. By disposing the near-infrared light filtering coating on the image side surface of the filtering lens, it is possible to ensure that light passes through the near-infrared light filtering coating at a small angle, which helps to further improve the near-infrared light filtering effect.

[0096] According to the optical lens disclosed in the present disclosure, the filter lens can be the first optical lens. By setting the filter lens made of glass as the first optical lens, it is helpful to reduce the lens wear during the assembly of the optical lens.

[0097] According to the optical lens disclosed herein, the near-infrared light filtering coating can be disposed on the image side surface of the filtering lens, and the filtering lens can include a blue glass material. By disposing the near-infrared light filtering coating on the image side surface of the filtering lens, it is possible to ensure that light passes through the near-infrared light filtering coating at a small angle, which helps to further enhance the near-infrared light filtering effect, and by disposing the near-infrared light filtering coating and the blue glass material on the same optical lens, it helps to optimize the near-infrared light filtering and the difference in penetration rate at each angle.

[0098] According to the optical lens disclosed herein, the horizontal displacement of the filter lens at the maximum effective diameter position is SAG, and the center thickness of the filter lens is CT, which can meet the following conditions: |SAG / CT|≤0.7. By limiting the ratio of the horizontal displacement of the filter lens at the maximum effective diameter position to the center thickness, the overall surface shape of the filter lens can be ensured to be flat, which helps to improve the uniformity of the coating. Alternatively, it can meet the following conditions: |SAG / CT|≤0.5. Alternatively, it can meet the following conditions: |SAG / CT|≤0.4. Alternatively, it can meet the following conditions: |SAG / CT|≤0.3. Alternatively, it can meet the following conditions: |SAG / CT|≤0.2. Alternatively, it can meet the following conditions: 0≤|SAG / CT|≤0.1.

[0099] According to the optical lens disclosed herein, the horizontal displacement of the filter lens at the maximum effective diameter position is SAG, and the radius of curvature of the filter lens at the center position is Rc, which can meet the following conditions: |SAG / Rc|≤0.1. By limiting the ratio of the horizontal displacement of the filter lens at the maximum effective diameter position to the radius of curvature at the center position, it is ensured that the surface shape of the filter lens changes little, which helps to further improve the uniformity of the coating. Alternatively, it can meet the following conditions: |SAG / Rc|≤0.08. Alternatively, it can meet the following conditions: |SAG / Rc|≤0.06. Alternatively, it can meet the following conditions: |SAG / Rc|≤0.04. Alternatively, it can meet the following conditions: |SAG / Rc|≤0.02. Alternatively, it can meet the following conditions: 0≤|SAG / Rc|≤0.01.

[0100] The film material of the near-infrared light filtering coating described in the present disclosure may include (the values ​​in brackets are the refractive index at wavelength = 587.6 nm): magnesium fluoride (MgF2, 1.3777), silicon dioxide (SiO2, 1.4585), thorium fluoride (ThF4, 1.5125), silicon monoxide (SiO, 1.55), cerium fluoride (CeF3, 1.63), aluminum oxide (Al2O3, 1.7682), yttrium oxide (Y2O3, 1.79), hafnium dioxide (HfO2, 1.8935), zinc oxide (ZnO, 1. 9269), scandium oxide (Sc2O3, 1.9872), aluminum nitride (AlN, 2.0294), silicon nitride (Si3N4, 2.0381), tantalum pentoxide (Ta2O5, 2.1306), zirconium dioxide (ZrO2, 2.1588), zinc sulfide (ZnS, 2.2719), niobium pentoxide (Nb2O5, 2.3403), titanium dioxide (TiO2, 2.6142) and / or titanium nitride (TiN, 3.1307), or a mixed material of magnesium fluoride and silicon dioxide (MgF2-SiO2 Mixture, content ratio such as: [SiO2]>[MgF2]).

[0101] In the arrangement position of the near-infrared light filtering coating described in the present disclosure, the near-infrared light filtering coating can be arranged on at least one of the object side surface and the image side surface of any optical lens in the optical lens, and can actually be arranged on the object side surface and the image side surface of the first optical lens, the object side surface and the image side surface of the second optical lens, the object side surface and the image side surface of the third optical lens, the object side surface and the image side surface of the fourth optical lens, the object side surface and the image side surface of the fifth optical lens, the object side surface and the image side surface of the sixth optical lens, the object side surface and the image side surface of the seventh optical lens, the object side surface and the image side surface of the eighth optical lens, the object side surface and the image side surface of the ninth optical lens, and the object side surface and the image side surface of the tenth optical lens. The near-infrared light filtering coating can be arranged on the object side surface and the image side surface of an optical lens at the same time, and the near-infrared light filtering coating can also be arranged on the object side surface and the image side surface of different optical lenses at the same time, and the number of layers and thickness of the object side surface and the image side surface are interchangeable. Optical lenses with near-infrared light filtering coatings disposed on different sides may have less deformation than optical lenses with near-infrared light filtering coatings disposed on the same side. For example, the near-infrared light filtering coating may be disposed on the image-side surface of the first optical lens and the object-side surface of the second optical lens, the near-infrared light filtering coating may be disposed on the object-side surface of the second optical lens and the image-side surface of the second optical lens, or the near-infrared light filtering coating may be disposed on the object-side surface of the third optical lens and the image-side surface of the fourth optical lens. The number of optical lenses with near-infrared light filtering coatings may be one, two, three, four, five, six, seven, eight, nine or ten. The near-infrared light filtering coating is disposed on the object side surface and the image side surface of the optical lens, which means that the near-infrared light filtering coating is directly or indirectly disposed on the object side surface and the image side surface of the optical lens. Indirect arrangement means that there are other types of coatings (such as anti-reflective coatings) or other types of arrangements (such as coatings or other materials) between the near-infrared light filtering coating and the surface of the optical lens. The near-infrared light filtering coating can also be disposed on the object side surface and the image side surface of other optical elements. The optical elements that can be disposed include flat glass, protective glass, plastic flat plates, glass flat plates or reflective elements. The filtering coating on the surface of other elements has a complete filtering effect that complements the insufficient wavelength band. Therefore, the coating made on the surface of the optical lens can be responsible for filtering out specific wavelength areas to reduce the number and thickness of film layers.

[0102] In the film layer design of the near-infrared light filtering coating described in the present disclosure, the near-infrared light filtering coating may include at least one film layer, and the first film layer of the near-infrared light filtering coating may be the side close to the surface of the optical lens, or the first film layer of the near-infrared light filtering coating may be the side away from the surface of the optical lens. The near-infrared light filtering coating is composed of high-refractive index film layers and low-refractive index film layers in an alternating stacking manner. The high-refractive index film layer refers to a film layer with a higher refractive index than the previous film layer, and the low-refractive index film layer refers to a film layer with a lower refractive index than the previous film layer. The first film layer uses the second film layer as a comparison standard to define a high-refractive index film layer or a low-refractive index film layer. For example, if the refractive index of the first film layer is greater than that of the second film layer, the first film layer is a high-refractive index film layer; if the refractive index of the first film layer is less than that of the second film layer, the first film layer is a low-refractive index film layer. The total number of layers of the near-infrared light filtering coating can be the sum of the number of layers of the near-infrared light filtering coating on the object side surface and the image side surface of each optical lens. The total thickness of the near-infrared light filtering coating can be the sum of the thickness of the near-infrared light filtering coating on the object side surface and the image side surface of each optical lens. Since the near-infrared light filtering coating of the present disclosure can be set on the object side surface and the image side surface of different optical lenses, the total number of layers and total thickness of the near-infrared light filtering coating need to calculate the film layers on all optical lenses that actually have the near-infrared light filtering effect.

[0103] The manufacturing technology of the near-infrared light filtering coating described in the present disclosure may use a liquid phase coating method or a vapor phase coating method. The liquid phase coating method may use an acid etching method, a solution deposition method, an electroplating method, an anodic oxidation method, a sol-gel method, a LB film, or a liquid phase epitaxy method. The vapor phase coating method may use a chemical vapor coating method or a physical vapor coating method. If the curvature of the coated lens varies greatly, an atomic layer deposition method (ALD) is required to achieve the best uniformity of the film layer to ensure the integrity of the near-infrared light filtering coating effect.

[0104] In the setting position and film layer composition of the anti-reflection coating described in the present disclosure, the anti-reflection coating is set on the object side surface or image side surface of the optical lens, which can exert excellent anti-reflection effect, reduce the serious reflection problem in the peripheral area of ​​the lens caused by the incident light at a large angle on the lens surface, effectively improve the transmittance of the imaging optical lens, and achieve the best anti-reflection effect. The anti-reflection coating includes at least one film layer, such as a high refractive index film layer and a low refractive index film layer alternately stacked, or composed of a sub-wavelength microstructure, or composed of a high refractive index film layer and a sub-wavelength microstructure, or composed of a low refractive index film layer and a sub-wavelength microstructure, or composed of a high refractive index film layer, a low refractive index film layer and a sub-wavelength microstructure. The anti-reflection coating can have a near-infrared light filtering coating on the inside (adjacent to the substrate). The anti-reflection coating can have a sub-wavelength microstructure on the outside (adjacent to the air), and the material can be a metal oxide such as aluminum oxide (Al2O3). The sub-wavelength microstructure of the anti-reflection coating may include a plurality of holes, and the size of the holes adjacent to the outer side of the anti-reflection coating is larger than the size of the holes adjacent to the inner side of the anti-reflection coating.

[0105] Among the materials of the optical lens described in the present disclosure, when the optical lens is made of glass, the optical lens can be made into a lens with at least one aspherical surface by molding glass technology. Blue glass material can also be added to the material of the optical lens, and the optical lens with the added blue glass material can be the first optical lens, the second optical lens, the third optical lens, the fourth optical lens, the fifth optical lens, the sixth optical lens, the seventh optical lens, the eighth optical lens, the ninth optical lens and / or the tenth optical lens in the optical lens. The composition of the aforementioned blue glass material can include phosphorus ions (P 5+ or P 3+ ), aluminum ions (Al 3 + ), antimony ions (Sb 5+ or Sb 3+ ), copper ions (Cu 2+ ), magnesium ion (Mg 2+ ), calcium ions (Ca 2+ ), strontium ion (Sr 2+ ), barium ions (Ba 2+ ), zinc ion (Zn 2+ ), lithium ion (Li + ), sodium ion (Na + ), potassium ion (K + ), phosphate (PO4 3- ) or fluoride ion (F -) etc. Alternatively, the composition of the blue glass material may include an inorganic compound composed of the aforementioned ions. When the optical lens is made of plastic material, the plastic material may include polyacrylic acid (PMMA), polystyrene (PS), polycarbonate (PC), cyclic olefin polymer (COP), cyclic olefin copolymer (COC), polyetherimide (PEI) and polyester resin (OKP-4 or OKP-4HT), and a long wavelength absorption material may be further added to the material of the optical lens.

[0106] In the optimal coating surface shape of the optical lens described in the present disclosure, the optimal coating surface shape is determined by the horizontal displacement of the filter lens at the maximum effective diameter position, the center thickness of the filter lens, and the curvature radius of the filter lens at the center position. The aforementioned maximum effective diameter refers to the optical effective diameter of the optical lens. Dividing 1.0F (1.0 field of view) into 20 equal parts, 0F, 0.05F, 0.1F, 0.15F, 0.2F, 0.25F, 0.3F, 0.35F, 0.4F, 0.45F, 0.5F, 0.55F, 0.6F, 0.65F, 0.7F, 0.75F, 0.8F, 0.85F, 0.9F, 0.95F, 1.0F and other 21 fields of view are obtained. The maximum effective diameter of the light passing through each optical lens in the 21 fields of view is the optical effective diameter. The direction of horizontal displacement refers to the direction in which the optical axis passes through the optical lens. The horizontal displacement of the maximum effective diameter position refers to the horizontal displacement from the center of the optical lens to the maximum effective diameter position. The curvature radius of the optical lens is calculated by taking the target point on the optical lens and two points 1E-10mm above and below the target point in the direction perpendicular to the optical axis.

[0107] In the coating setting of the optical lens described in the present disclosure, when the object side surface or the image side surface of the optical lens includes a near-infrared light filtering coating, this lens is a filtering lens. The filtering lens means that the lens has a near-infrared light filtering effect, and the near-infrared light filtering effect mainly reduces the transmittance of wavelengths from 700nm to 1050nm.

[0108] The transmittance of the optical lens described in the present disclosure will be different when each wavelength of light at each angle enters the optical lens, and the wavelength transmittance at each angle will be different, and the wavelength at each angle where the long wavelength visible light has a 50% transmittance will also be different. The wavelength transmittance of the present disclosure is based on an interval of 5nm, and the wavelength value at each angle where the long wavelength visible light has a 50% transmittance is calculated by interpolation. The angle of the incident optical lens can be 0 degrees, 5 degrees, 10 degrees, 15 degrees, 20 degrees, 25 degrees, 30 degrees, 35 degrees, 40 degrees, 45 degrees or 50 degrees, etc., which are less than 90 degrees. When there is no clear angle specified in the description of the present disclosure, the 0 degree angle is used as the default standard, and the non-0 degree angle data is specified and noted separately. At the 50% transmittance of long wavelength visible light, the difference in wavelength between 0 degrees and 30 degrees is the value obtained by subtracting the wavelength at the 50% transmittance of long wavelength visible light incident at 0 degrees from the wavelength at the 50% transmittance of long wavelength visible light incident at 30 degrees. At the point where the long wavelength visible light has a 50% transmittance, the difference in wavelength between 0 degrees and 40 degrees is the value obtained by subtracting the wavelength at the point where the long wavelength visible light has a 50% transmittance at 0 degrees from the wavelength at the point where the long wavelength visible light has a 50% transmittance at 40 degrees. Visible light may have multiple wavelengths with a 50% transmittance. The present disclosure defines the long wavelength range as the region above 500nm, the short wavelength as the region below 500nm, and the point where the long wavelength visible light has a 50% transmittance refers to the longest wavelength with a transmittance of 50% in the wavelength range of 500nm to 750nm.

[0109] In the correction technology of optical lenses described in the present disclosure, when the material of the optical lens is plastic, it is easy to cause excessive surface shape error due to high temperature, which is particularly obvious when the lens thickness is too small. The more film layers there are, the more obvious the temperature affects the surface shape accuracy. The lens correction technology can effectively solve the temperature effect problem when the plastic surface is coated, which helps to maintain the integrity of the lens coating and the high precision of the plastic lens, and is a key technology for achieving high-quality imaging lenses. Lens correction technology such as the application of mold flow analysis method, curve fitting function method or wavefront error method, but not limited to this. Among them, the mold flow analysis method uses mold flow analysis to find the three-dimensional contour node of the lens surface shrinking in the Z axis, converts it into an aspheric curve, and then compares the difference with the original curve. At the same time, the material shrinkage rate and the surface deformation trend are considered to calculate the correction value. Among them, the curve fitting function method measures the surface contour error of the component, fits the curve with a function, and uses an optimization algorithm to approximate the fitting curve to the measurement point to obtain the correction value. Functions such as exponential or polynomial, algorithms such as Gauss Newton, Simplex Algorithm or Steepest Descent Method, etc. The wavefront error method uses an interferometer to measure the wavefront error (imaging error) data of the optical system, and uses the original design value wavefront error to comprehensively analyze the wavefront error generated by manufacturing and assembly, and then optimizes the optical software to obtain the correction value.

[0110] The object side and image side of the optical lens described in the present disclosure are defined as follows: the image side is the side on the optical axis close to the imaging surface, and the object side is the side on the optical axis far from the imaging surface.

[0111] The optical elements of the optical lens described in the present disclosure may be optical elements with visible light penetration characteristics such as optical lenses, flat glass (Cover glass), blue glass (Blue glass), micro lenses (Micro lens) and filter elements (Filter, Color filter). The optical lens may set the aforementioned optical elements on the surface of the electronic photosensitive element (the imaging surface of the optical lens), and combine the combination of the near-infrared light filtering coating in the optical lens and the surface of the optical lens to help the optical lens reduce the angle of the main light at the maximum image height field of view incident on the electronic photosensitive element, thereby achieving the effect of reducing the back focal length and the total length. In order to make the refractive index of the optical element and the surface of the electronic photosensitive element close to or the same, a high molecular polymer may be set between the optical element and the electronic photosensitive element so that the light directly passes through the interface between the flat glass and the electronic photosensitive element without refraction, thereby avoiding re-refraction and causing the incident angle to increase.

[0112] The flat glass of the optical lens described in the present disclosure can be arranged on the object side of the electronic photosensitive element, and at least one or both of the object side surface and the image side surface of the flat glass can be made with an anti-reflection coating. There can be an air layer or no air layer between the flat glass and the electronic photosensitive element. When the optical lens is designed as an optical system with an air layer between the flat glass and the electronic photosensitive element, at least one or both of the object side surface and the image side surface of the flat glass can be made with an anti-reflection coating; when the optical lens is designed as an optical system without an air layer between the flat glass and the electronic photosensitive element, an anti-reflection coating can be made on the object side surface of the flat glass. At least one or both of the object side surface and the image side surface of the flat glass can have a long-wavelength absorption material, and the long-wavelength absorption material is mixed into a polymer, and the polymer is arranged on the surface of the flat glass. When the optical lens is designed as an optical system with an air layer between the flat glass and the electronic photosensitive element, at least one or both of the object side surface and the image side surface of the flat glass can be designed with a long wavelength absorption material film layer; when the optical lens is designed as an optical system without an air layer between the flat glass and the electronic photosensitive element, the object side surface of the flat glass can be designed with a long wavelength absorption material film layer. The material of the flat glass can further be designed to have a long wavelength absorption material.

[0113] The blue glass of the optical lens described in the present disclosure can be arranged on the object side of the electronic photosensitive element, and at least one or both of the object side surface and the image side surface of the blue glass can be made into an anti-reflection coating. There can be an air layer or no air layer between the blue glass and the electronic photosensitive element. When the optical lens is designed as an optical system with an air layer between the blue glass and the electronic photosensitive element, at least one or both of the object side surface and the image side surface of the blue glass can be made into an anti-reflection coating; when the optical lens is designed as an optical system without an air layer between the blue glass and the electronic photosensitive element, an anti-reflection coating can be made on the object side surface of the blue glass. At least one or both of the object side surface and the image side surface of the blue glass can have a long-wavelength absorption material, and the long-wavelength absorption material is mixed into a polymer, and the polymer is arranged on the surface of the blue glass. When the optical lens is designed as an optical system with an air layer between the blue glass and the electronic photosensitive element, at least one or both of the object side surface and the image side surface of the blue glass can be designed with a long wavelength absorption material film layer; when the optical lens is designed as an optical system without an air layer between the blue glass and the electronic photosensitive element, the object side surface of the blue glass can be designed with a long wavelength absorption material film layer. The material of the blue glass can further be designed to have a long wavelength absorption material.

[0114] The microlens of the optical lens described in the present disclosure can be arranged on the object side of the electronic photosensitive element, and the object side surface and image side surface of the microlens can have a long wavelength absorption material. The long wavelength absorption material is mixed with a polymer, and the polymer is arranged on the surface of the microlens, or the polymer is arranged between the microlens and the color filter as a connecting layer, or the long wavelength absorption material is mixed and arranged in the color filter, and can further be selected to be arranged in the red filter part, the green filter part and the blue filter part.

[0115] The near-infrared light filtering coating, long-wavelength absorption material and blue glass material of the optical lens described in the present disclosure can be arbitrarily matched through surface settings and material additions and used in the same optical lens or different optical lenses.

[0116] The various technical features of the optical lens described in the above disclosure can be configured in combination to achieve corresponding effects.

[0117] Another embodiment of the present disclosure provides an imaging device, comprising the aforementioned optical lens and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on an imaging surface of the optical lens. Preferably, the imaging device may further comprise a barrel member, a holder member or a combination thereof.

[0118] The present disclosure further provides an electronic device including the aforementioned imaging device. Thereby, the imaging quality can be effectively improved. Preferably, the electronic device may further include but not limited to a control unit (Control Unit), a display unit (Display), a storage unit (Storage Unit), a random access memory (RAM), a read-only storage unit (ROM) or a combination thereof. Furthermore, the electronic device of the present disclosure may be a camera, a mobile phone, a portable computer, a handheld game console, a home game console, a head-mounted device, a car device or a transportation device, but is not limited thereto.

[0119] According to the above implementation modes, specific embodiments are proposed below and described in detail with reference to the accompanying drawings.

[0120] <First Embodiment>

[0121] The optical lens of the first embodiment includes at least four optical lenses, and at least one of the at least four optical lenses is a filter lens. The filter lens has a near-infrared light filter coating, and the near-infrared light filter coating has at least one low refractive index film layer and at least one high refractive index film layer, and the near-infrared light filter coating is a high refractive index film layer and a low refractive index film layer alternately stacked. In addition, at least one of the at least four optical lenses may include a blue glass material, the filter lens may be made of glass, and the filter lens may have at least one aspherical surface.

[0122] Please refer to Table 1, which shows the details of the near infrared light filtering coating of the filter lens of the first embodiment, wherein tLs is the total number of layers of the near infrared light filtering coating, otLs is the total number of layers of the near infrared light filtering coating on the object side surface of the filter lens, itLs is the total number of layers of the near infrared light filtering coating on the image side surface of the filter lens, tTk is the total thickness of the near infrared light filtering coating, LtTk is the total thickness of the low refractive index film layer, HtTk is the total thickness of the high refractive index film layer, otTk is the total thickness of the near infrared light filtering coating on the object side surface of the filter lens, itTk is the total thickness of the near infrared light filtering coating on the image side surface of the filter lens, NL is the refractive index of the low refractive index film layer, and NH is the refractive index of the high refractive index film layer. The near infrared light filtering coating can be set on the object side surface or the image side surface of the filter lens, and the total number of layers of the near infrared light filtering coating of the filter lens of the first embodiment is tLs=72.

[0123]

[0124]

[0125] Please refer to Figure 1 Compared with Table 2, Figure 1 2 is a graph showing the relationship between the transmittance of the filter lens in the optical lens of the first embodiment of the present disclosure and the wavelength. Table 2 shows the transmittance values ​​of the filter lens of the first embodiment at wavelengths of 350nm to 1050nm, wherein the incident angles of the light incident on the filter lens of the first embodiment are 0 degrees, 30 degrees and 40 degrees respectively.

[0126]

[0127]

[0128]

[0129]

[0130]

[0131]

[0132] Please refer to Table 3 again, which is the parameter values ​​of the filter lens in the optical lens of the first embodiment when the incident angle is 0 degree, 30 degree and 40 degree, wherein Wt50v is the wavelength of the filter lens at 50% transmittance of long wavelength visible light, dWt50v3 is the wavelength difference between 0 degree and 30 degree incident at 50% transmittance of long wavelength visible light, dWt50v4 is the wavelength difference between 0 degree and 40 degree incident at 50% transmittance of long wavelength visible light, T3540 is the average transmittance of the filter lens at wavelengths of 350nm to 400nm, T456 3 is the average transmittance of the filter lens at a wavelength of 450nm to 630nm, T6065 is the average transmittance of the filter lens at a wavelength of 600nm to 650nm, T70105 is the average transmittance of the filter lens at a wavelength of 700nm to 1050nm, T45 is the transmittance of the filter lens at a wavelength of 450nm, T50 is the transmittance of the filter lens at a wavelength of 500nm, T63 is the transmittance of the filter lens at a wavelength of 630nm, T85 is the transmittance of the filter lens at a wavelength of 850nm, and T94 is the transmittance of the filter lens at a wavelength of 940nm.

[0133]

[0134] If the definitions of the data in the tables of the following embodiments are the same as those in Tables 1 to 3, they will not be repeated here.

[0135] <Second Embodiment>

[0136] The optical lens of the second embodiment includes at least four optical lenses, and at least one of the at least four optical lenses is a filter lens. The filter lens has a near-infrared light filter coating, and the near-infrared light filter coating has at least one low refractive index film layer and at least one high refractive index film layer, and the near-infrared light filter coating is a high refractive index film layer and a low refractive index film layer alternately stacked. In addition, at least one of the at least four optical lenses may include a blue glass material, the filter lens may be made of glass, and the filter lens may have at least one aspherical surface.

[0137] Please refer to Table 4, which shows the values ​​of tLs, otLs, itLs, tTk, LtTk, HtTk, LtTk / HtTk, otTk, itTk, otTk / itTk, NL, NH and NH-NL of the near-infrared light filtering coating of the filter lens of the second embodiment, wherein the near-infrared light filtering coating can be disposed on the object side surface or the image side surface of the filter lens, and the total number of layers of the near-infrared light filtering coating of the filter lens of the second embodiment is tLs=72.

[0138]

[0139] Please refer to Figure 2 Compared with Table 5, Figure 2 1 is a graph showing the relationship between the transmittance of the filter lens in the optical lens of the second embodiment of the present disclosure and the wavelength. Table 5 shows the transmittance values ​​of the filter lens of the second embodiment at wavelengths of 350nm to 1050nm, wherein the incident angles of the light incident on the filter lens of the second embodiment are 0 degrees, 30 degrees and 40 degrees respectively.

[0140]

[0141]

[0142]

[0143]

[0144]

[0145]

[0146] Please refer to Table 6 again, which shows the values ​​of Wt50v, |dWt50v3|, |dWt50v4|, T3540, T4563, T6065, T70105, T45, T50, T63, T85 and T94 of the filter lens in the optical lens of the second embodiment when the incident angles are 0 degrees, 30 degrees and 40 degrees.

[0147]

[0148]

[0149] <Third Embodiment>

[0150] The optical lens of the third embodiment includes at least four optical lenses, and at least one of the at least four optical lenses is a filter lens. The filter lens has a near-infrared light filter coating, and the near-infrared light filter coating has at least one low refractive index film layer and at least one high refractive index film layer, and the near-infrared light filter coating is a high refractive index film layer and a low refractive index film layer alternately stacked. In addition, at least one of the at least four optical lenses may include a blue glass material, the filter lens may be made of glass, and the filter lens may have at least one aspherical surface.

[0151] Please refer to Table 7, which shows the values ​​of tLs, otLs, itLs, tTk, LtTk, HtTk, LtTk / HtTk, otTk, itTk, otTk / itTk, NL, NH and NH-NL of the near-infrared light filtering coating of the filter lens of the third embodiment, wherein the near-infrared light filtering coating can be disposed on the object side surface or the image side surface of the filter lens, and the total number of layers of the near-infrared light filtering coating of the filter lens of the third embodiment is tLs=78.

[0152]

[0153] Please refer to Figure 3 Compared with Table 8, Figure 3 1 is a graph showing the relationship between the transmittance of the filter lens in the optical lens of the third embodiment of the present disclosure and the wavelength. Table 8 shows the transmittance values ​​of the filter lens of the third embodiment at wavelengths of 350nm to 1050nm, wherein the incident angles of the light incident on the filter lens of the third embodiment are 0 degrees, 30 degrees and 40 degrees respectively.

[0154]

[0155]

[0156]

[0157]

[0158]

[0159] Please refer to Table 9 again, which shows the values ​​of Wt50v, |dWt50v3|, |dWt50v4|, T3540, T4563, T6065, T70105, T45, T50, T63, T85 and T94 of the filter lens in the optical lens of the third embodiment when the incident angles are 0 degrees, 30 degrees and 40 degrees.

[0160]

[0161] <Fourth Embodiment>

[0162] The optical lens of the fourth embodiment includes at least four optical lenses, and at least one of the at least four optical lenses is a filter lens. The filter lens has a near-infrared light filter coating, and the near-infrared light filter coating has at least one low refractive index film layer and at least one high refractive index film layer, and the near-infrared light filter coating is a high refractive index film layer and a low refractive index film layer alternately stacked. In addition, at least one of the at least four optical lenses may include a blue glass material, the filter lens may be made of glass, and the filter lens may have at least one aspherical surface.

[0163] Please refer to Table 10, which shows the values ​​of tLs, otLs, itLs, tTk, LtTk, HtTk, LtTk / HtTk, otTk, itTk, otTk / itTk, NL, NH and NH-NL of the near-infrared light filtering coating of the filter lens of the fourth embodiment, wherein the near-infrared light filtering coating can be disposed on the object side surface or the image side surface of the filter lens, and the total number of layers of the near-infrared light filtering coating of the filter lens of the fourth embodiment is tLs=84.

[0164]

[0165]

[0166] Please refer to Figure 4 Compared with Table 11, Figure 4 1 is a graph showing the relationship between the transmittance of the filter lens in the optical lens of the fourth embodiment of the present disclosure and the wavelength. Table 11 shows the transmittance values ​​of the filter lens of the fourth embodiment at wavelengths of 350nm to 1050nm, wherein the incident angles of the light incident on the filter lens of the fourth embodiment are 0 degrees, 30 degrees and 40 degrees respectively.

[0167]

[0168]

[0169]

[0170]

[0171]

[0172]

[0173] Please refer to Table 12 again, which shows the values ​​of Wt50v, |dWt50v3|, |dWt50v4|, T3540, T4563, T6065, T70105, T45, T50, T63, T85 and T94 of the filter lens in the optical lens of the fourth embodiment when the incident angles are 0 degrees, 30 degrees and 40 degrees.

[0174]

[0175] <Fifth Embodiment>

[0176] The optical lens of the fifth embodiment includes at least four optical lenses, and at least one of the at least four optical lenses is a filter lens. The filter lens has a near-infrared light filter coating, and the near-infrared light filter coating has at least one low refractive index film layer and at least one high refractive index film layer, and the near-infrared light filter coating is a high refractive index film layer and a low refractive index film layer alternately stacked. In addition, at least one of the at least four optical lenses may include a blue glass material, the filter lens may be made of glass, and the filter lens may have at least one aspherical surface.

[0177] Please refer to Table 13, which shows the values ​​of tLs, otLs, itLs, tTk, LtTk, HtTk, LtTk / HtTk, otTk, itTk, otTk / itTk, NL, NH and NH-NL of the near-infrared light filtering coating of the filter lens of the fifth embodiment, wherein the near-infrared light filtering coating can be disposed on the object side surface or the image side surface of the filter lens, and the total number of layers of the near-infrared light filtering coating of the filter lens of the fifth embodiment is tLs=70.

[0178]

[0179] The details of each layer of the multi-layer coating of the fifth embodiment are shown in Table 14, where "H" represents a high refractive index film layer and "L" represents a low refractive index film layer.

[0180]

[0181]

[0182]

[0183]

[0184] Please refer to Figure 5 Compared with Table 15, Figure 5 1 is a graph showing the relationship between the transmittance of the filter lens in the optical lens of the fifth embodiment of the present disclosure and the wavelength. Table 15 shows the transmittance values ​​of the filter lens of the fifth embodiment at wavelengths of 350nm to 1050nm, wherein the incident angles of the light incident on the filter lens of the fifth embodiment are 0 degrees, 30 degrees and 40 degrees respectively.

[0185]

[0186]

[0187]

[0188]

[0189]

[0190]

[0191] Please refer to Table 16 again, which shows the values ​​of Wt50v, |dWt50v3|, |dWt50v4|, T3540, T4563, T6065, T70105, T45, T50, T63, T85 and T94 of the filter lens in the optical lens of the fifth embodiment when the incident angles are 0 degrees, 30 degrees and 40 degrees.

[0192]

[0193] <Sixth Embodiment>

[0194] The optical lens of the sixth embodiment includes at least four optical lenses, and at least one of the at least four optical lenses is a filter lens. The filter lens has a near-infrared light filter coating, and the near-infrared light filter coating has at least one low refractive index film layer and at least one high refractive index film layer, and the near-infrared light filter coating is a high refractive index film layer and a low refractive index film layer alternately stacked. In addition, at least one of the at least four optical lenses may include a blue glass material, the filter lens may be made of glass, and the filter lens may have at least one aspherical surface.

[0195] Please refer to Table 17, which shows the values ​​of tLs, otLs, itLs, tTk, LtTk, HtTk, LtTk / HtTk, otTk, itTk, otTk / itTk, NL, NH and NH-NL of the near-infrared light filtering coating of the filter lens of the sixth embodiment, wherein the near-infrared light filtering coating of the sixth embodiment is arranged on the object side surface and the image side surface of the filter lens, the total number of layers of the near-infrared light filtering coating of the filter lens tLs=72, the total number of layers of the near-infrared light filtering coating on the object side surface of the filter lens otLs=36, and the total number of layers of the near-infrared light filtering coating on the image side surface of the filter lens itLs=36.

[0196]

[0197] Please refer to Figure 6 With Table 18, Figure 6 1 is a graph showing the relationship between the transmittance of the filter lens in the optical lens of the sixth embodiment of the present disclosure and the wavelength. Table 18 shows the transmittance values ​​of the filter lens of the sixth embodiment at wavelengths of 350nm to 1050nm, wherein the incident angles of the light incident on the filter lens of the sixth embodiment are 0 degrees, 30 degrees and 40 degrees respectively.

[0198]

[0199]

[0200]

[0201]

[0202]

[0203]

[0204] Please refer to Table 19 again, which shows the values ​​of Wt50v, |dWt50v3|, |dWt50v4|, T3540, T4563, T6065, T70105, T45, T50, T63, T85 and T94 of the filter lens in the optical lens of the sixth embodiment when the incident angles are 0 degrees, 30 degrees and 40 degrees.

[0205]

[0206]

[0207] <Seventh Embodiment>

[0208] The optical lens of the seventh embodiment includes at least four optical lenses, and at least one of the at least four optical lenses is a filter lens. The filter lens has a near-infrared light filter coating, and the near-infrared light filter coating has at least one low refractive index film layer and at least one high refractive index film layer, and the near-infrared light filter coating is a high refractive index film layer and a low refractive index film layer alternately stacked. In addition, at least one of the at least four optical lenses may include a blue glass material, the filter lens may be made of glass, and the filter lens may have at least one aspherical surface.

[0209] Please refer to Table 20, which shows the values ​​of tLs, otLs, itLs, tTk, LtTk, HtTk, LtTk / HtTk, otTk, itTk, otTk / itTk, NL, NH and NH-NL of the near-infrared light filtering coating of the filter lens of the seventh embodiment, wherein the near-infrared light filtering coating of the seventh embodiment is arranged on the object side surface and the image side surface of the filter lens, the total number of layers of the near-infrared light filtering coating of the filter lens tLs=78, the total number of layers of the near-infrared light filtering coating on the object side surface of the filter lens otLs=38, and the total number of layers of the near-infrared light filtering coating on the image side surface of the filter lens itLs=40.

[0210]

[0211] Please refer to Figure 7 With Table 21, Figure 7 2 is a graph showing the relationship between the transmittance of the filter lens in the optical lens of the 7th embodiment of the present disclosure and the wavelength. Table 21 shows the transmittance values ​​of the filter lens of the 7th embodiment at wavelengths of 350nm to 1050nm, wherein the incident angles of the light incident on the filter lens of the 7th embodiment are 0 degrees, 30 degrees and 40 degrees respectively.

[0212]

[0213]

[0214]

[0215]

[0216]

[0217]

[0218] Please refer to Table 22 again, which shows the values ​​of Wt50v, |dWt50v3|, |dWt50v4|, T3540, T4563, T6065, T70105, T45, T50, T63, T85 and T94 of the filter lens in the optical lens of the 7th embodiment when the incident angles are 0 degrees, 30 degrees and 40 degrees.

[0219]

[0220]

[0221] <Eighth Embodiment>

[0222] The optical lens of the eighth embodiment includes at least four optical lenses, and at least one of the at least four optical lenses is a filter lens. The filter lens has a near-infrared light filter coating, and the near-infrared light filter coating has at least one low refractive index film layer and at least one high refractive index film layer, and the near-infrared light filter coating is a high refractive index film layer and a low refractive index film layer alternately stacked. In addition, at least one of the at least four optical lenses may include a blue glass material, the filter lens may be made of glass, and the filter lens may have at least one aspherical surface.

[0223] Please refer to Table 23, which shows the values ​​of tLs, otLs, itLs, tTk, LtTk, HtTk, LtTk / HtTk, otTk, itTk, otTk / itTk, NL, NH and NH-NL of the near-infrared light filtering coating of the filter lens of the eighth embodiment, wherein the near-infrared light filtering coating of the eighth embodiment is disposed on the object side surface and the image side surface of the filter lens, the total number of layers of the near-infrared light filtering coating of the filter lens tLs=76, the total number of layers of the near-infrared light filtering coating on the object side surface of the filter lens otLs=36, and the total number of layers of the near-infrared light filtering coating on the image side surface of the filter lens itLs=40.

[0224]

[0225]

[0226] Please refer to Figure 8 With Table 24, Figure 824 is a graph showing the relationship between the transmittance of the filter lens in the optical lens of the 8th embodiment of the present disclosure and the wavelength. Table 25 is the transmittance values ​​of the filter lens of the 8th embodiment at wavelengths of 350nm to 1050nm, wherein the incident angles of the light incident on the filter lens of the 8th embodiment are 0 degrees, 30 degrees and 40 degrees respectively.

[0227]

[0228]

[0229]

[0230]

[0231]

[0232]

[0233] Please refer to Table 25 again, which shows the values ​​of Wt50v, |dWt50v3|, |dWt50v4|, T3540, T4563, T6065, T70105, T45, T50, T63, T85 and T94 of the filter lens in the optical lens of the eighth embodiment when the incident angles are 0 degrees, 30 degrees and 40 degrees.

[0234]

[0235] <Ninth Embodiment>

[0236] The optical lens of the ninth embodiment includes at least four optical lenses, and at least one of the at least four optical lenses is a filter lens. The filter lens has a near-infrared light filter coating, and the near-infrared light filter coating has at least one low refractive index film layer and at least one high refractive index film layer, and the near-infrared light filter coating is a high refractive index film layer and a low refractive index film layer alternately stacked. In addition, at least one of the at least four optical lenses may include a blue glass material, the filter lens may be made of glass, and the filter lens may have at least one aspherical surface.

[0237] Please refer to Table 26, which shows the values ​​of tLs, otLs, itLs, tTk, LtTk, HtTk, LtTk / HtTk, otTk, itTk, otTk / itTk, NL, NH and NH-NL of the near-infrared light filtering coating of the filter lens of the 9th embodiment, wherein the near-infrared light filtering coating of the 9th embodiment is arranged on the object side surface and the image side surface of the filter lens, the total number of layers of the near-infrared light filtering coating of the filter lens tLs=76, the total number of layers of the near-infrared light filtering coating on the object side surface of the filter lens otLs=36, and the total number of layers of the near-infrared light filtering coating on the image side surface of the filter lens itLs=40.

[0238]

[0239] Please refer to Fig. 9 With Table 27, Fig. 9 27 is a graph showing the relationship between the transmittance of the filter lens in the optical lens of the 9th embodiment of the present disclosure and the wavelength. Table 27 shows the transmittance values ​​of the filter lens of the 9th embodiment at wavelengths of 350nm to 1050nm, wherein the incident angles of the light incident on the filter lens of the 9th embodiment are 0 degrees, 30 degrees and 40 degrees respectively.

[0240]

[0241]

[0242]

[0243]

[0244]

[0245]

[0246] Please refer to Table 28 again, which shows the values ​​of Wt50v, |dWt50v3|, |dWt50v4|, T3540, T4563, T6065, T70105, T45, T50, T63, T85 and T94 of the filter lens in the optical lens of the 9th embodiment when the incident angles are 0 degrees, 30 degrees and 40 degrees.

[0247]

[0248]

[0249] <10th Embodiment>

[0250] The optical lens of the tenth embodiment includes at least four optical lenses, at least one of which is a filter lens. The filter lens has a near-infrared light filter coating, the near-infrared light filter coating has at least one low refractive index film layer and at least one high refractive index film layer, and the near-infrared light filter coating is a high refractive index film layer and a low refractive index film layer alternately stacked. In addition, at least one of the at least four optical lenses may include a blue glass material, the filter lens may be made of glass, and the filter lens may have at least one aspherical surface.

[0251] Please refer to Table 29, which shows the values ​​of tLs, otLs, itLs, tTk, LtTk, HtTk, LtTk / HtTk, otTk, itTk, otTk / itTk, NL, NH and NH-NL of the near-infrared light filtering coating of the filter lens of the tenth embodiment, wherein the near-infrared light filtering coating of the tenth embodiment is arranged on the object side surface and the image side surface of the filter lens, the total number of layers of the near-infrared light filtering coating of the filter lens tLs=76, the total number of layers of the near-infrared light filtering coating on the object side surface of the filter lens otLs=36, and the total number of layers of the near-infrared light filtering coating on the image side surface of the filter lens itLs=40.

[0252]

[0253] Please refer to Table 30 and Table 31. Table 30 shows the details of each layer of the near-infrared light filtering coating on the object-side surface of the filter lens of the tenth embodiment, and Table 31 shows the details of each layer of the near-infrared light filtering coating on the image-side surface of the filter lens of the tenth embodiment, wherein "H" in Table 30 and Table 31 represents a high refractive index film layer, and "L" represents a low refractive index film layer.

[0254]

[0255]

[0256]

[0257]

[0258] Please refer to Fig.10 With Table 32, Fig.10 3 is a graph showing the relationship between the transmittance of the filter lens in the optical lens of the tenth embodiment of the present disclosure and the wavelength. Table 32 shows the transmittance values ​​of the filter lens of the tenth embodiment at wavelengths of 350nm to 1050nm, wherein the incident angles of the light incident on the filter lens of the tenth embodiment are 0 degrees, 30 degrees and 40 degrees respectively.

[0259]

[0260]

[0261]

[0262]

[0263]

[0264]

[0265] Please refer to Table 33 again, which shows the values ​​of Wt50v, |dWt50v3|, |dWt50v4|, T3540, T4563, T6065, T70105, T45, T50, T63, T85 and T94 of the filter lens in the optical lens of the tenth embodiment when the incident angles are 0 degrees, 30 degrees and 40 degrees.

[0266]

[0267]

[0268] <11th embodiment>

[0269] The optical lens of the 11th embodiment includes at least four optical lenses, and the at least four optical lenses are respectively a first optical lens, a second optical lens, a third optical lens and a fourth optical lens from the object side to the image side of the optical lens. At least one of the at least four optical lenses is a filter lens. The filter lens has a near-infrared light filtering coating, and the near-infrared light filtering coating has at least one low refractive index film layer and at least one high refractive index film layer, and the near-infrared light filtering coating is a high refractive index film layer and a low refractive index film layer alternately stacked. In addition, at least one of the at least four optical lenses may include a blue glass material, the filter lens may be made of glass, and the filter lens may have at least one aspherical surface.

[0270] Please refer to Fig.11 With Table 34, Fig.11 34 is a graph showing the relationship between the transmittance and wavelength of the optical lens of the 11th embodiment of the present disclosure. Table 35 is the transmittance value of the optical lens of the 11th embodiment at a wavelength of 350nm to 1050nm, wherein the incident angle of the light incident on the optical lens of the 11th embodiment is 0 degree.

[0271]

[0272]

[0273]

[0274]

[0275]

[0276]

[0277] Please refer to Table 35 again, which shows the values ​​of Wt50v, |dWt50v3|, |dWt50v4|, T3540, T4563, T6065, T70105, T45, T50, T63, T85 and T94 of the optical lens of the 11th embodiment when the incident angle is 0 degree.

[0278]

[0279]

[0280] <12th embodiment>

[0281] The optical lens of the twelfth embodiment includes at least four optical lenses, and the at least four optical lenses are respectively a first optical lens, a second optical lens, a third optical lens and a fourth optical lens from the object side to the image side of the optical lens. At least one of the at least four optical lenses is a filter lens. The filter lens has a near-infrared light filtering coating, and the near-infrared light filtering coating has at least one low refractive index film layer and at least one high refractive index film layer, and the near-infrared light filtering coating is a high refractive index film layer and a low refractive index film layer alternately stacked. In addition, at least one of the at least four optical lenses may include a blue glass material, the filter lens may be made of glass, and the filter lens may have at least one aspherical surface.

[0282] Please refer to Fig.12 With Table 36, Fig.12 3 is a graph showing the relationship between the transmittance and wavelength of the optical lens of the 12th embodiment of the present disclosure. Table 36 is the transmittance values ​​of the optical lens of the 12th embodiment at wavelengths of 350nm to 1050nm, wherein the incident angle of the light incident on the optical lens of the 12th embodiment is 0 degrees.

[0283]

[0284]

[0285]

[0286]

[0287]

[0288]

[0289] Please refer to Table 37 again, which shows the values ​​of Wt50v, |dWt50v3|, |dWt50v4|, T3540, T4563, T6065, T70105, T45, T50, T63, T85 and T94 of the optical lens of the twelfth embodiment when the incident angle is 0 degree.

[0290]

[0291]

[0292] <13th embodiment>

[0293] The optical lens of the 13th embodiment includes seven optical lenses, and the seven optical lenses are respectively a first optical lens, a second optical lens, a third optical lens, a fourth optical lens, a fifth optical lens, a sixth optical lens and a seventh optical lens from the object side to the image side of the optical lens. At least one of the first to seventh optical lenses is a filter lens. The filter lens has a near-infrared light filtering coating, and the filter lens of the optical lens of the 13th embodiment can be any one of the filter lenses of the first to 12th embodiments, and its near-infrared light filtering coating can also be configured on a relatively flat surface of the optical lens in combination with the near-infrared light filtering coating of any one of the first to 12th embodiments. In addition, at least one of the seven optical lenses can include a blue glass material, the filter lens can be made of glass, and the filter lens can have at least one aspherical surface.

[0294] Please refer to Table 38, which shows the surface configuration of the optical lenses in the optical lens of the 13th embodiment.

[0295]

[0296]

[0297] In Table 38, L1 to L7 represent the first optical lens, the second optical lens, the third optical lens, the fourth optical lens, the fifth optical lens, the sixth optical lens and the seventh optical lens respectively, R1 represents the object side surface of each optical lens, R2 represents the image side surface of each optical lens, and “*” indicates the best coating surface shape.

[0298] As shown in Table 38, the first optical lens is made of glass, and the near-infrared light filtering coating of the 13th embodiment can be arranged on the image side surface of the first optical lens, the image side surface of the third optical lens, the object side surface of the fourth optical lens and the image side surface of the fourth optical lens.

[0299] Although the present disclosure has been disclosed in the above implementation mode, it is not intended to limit the present disclosure. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of the present disclosure should be determined by the attached claims.

Claims

1. An optical lens, characterized in that: Include: At least four optical lenses, which are respectively a first optical lens, a second optical lens, a third optical lens and a fourth optical lens from the object side to the image side of the optical lens; At least one of the at least four optical lenses is a filter lens, the filter lens has a near-infrared light filtering coating, the filter lens is made of glass, and the filter lens has at least one aspherical surface; The near-infrared light filtering coating has at least one low refractive index film layer and at least one high refractive index film layer, and the near-infrared light filtering coating is a stacking of the high refractive index film layer and the low refractive index film layer alternately; The wavelength of the filter lens at 50% transmittance of long-wavelength visible light is Wt50v, the wavelength difference between 0 degree and 30 degree incident at 50% transmittance of long-wavelength visible light is dWt50v3, the average transmittance of the filter lens at a wavelength of 600nm to 650nm is T6065, and the average transmittance of the filter lens at a wavelength of 700nm to 1050nm is T70105, which meets the following conditions: 650nm≤Wt50v; |dWt50v3|≤20nm; 90% ≤ T6065; and T70105≤5％。 2. The optical lens according to claim 1, wherein: The total number of layers of the near-infrared light filtering coating is tLs, which meets the following conditions: 40≤tLs≤200.

3. The optical lens according to claim 2, wherein: The total thickness of the near-infrared light filtering coating is tTk, which meets the following conditions: 4000nm≤tTk≤10000nm.

4. The optical lens according to claim 3, characterized in that: The total thickness of the low refractive index film layer is LtTk, and the total thickness of the high refractive index film layer is HtTk, which meets the following conditions: 1.0≤LtTk / HtTk≤2.

0.

5. The optical lens according to claim 1, wherein: The near-infrared light filtering coating is disposed on the object side surface and the image side surface of the filtering lens. The total number of layers of the near-infrared light filtering coating on the object side surface of the filtering lens is otLs, and the total number of layers of the near-infrared light filtering coating on the image side surface of the filtering lens is itLs, which meets the following conditions: otLs≤40; and itLs≤40.

6. The optical lens according to claim 5, characterized in that: The total thickness of the near-infrared light filtering coating on the object side surface of the filtering lens is otTk, and the total thickness of the near-infrared light filtering coating on the image side surface of the filtering lens is itTk, which meets the following conditions: 0.1≤otTk / itTk≤10.

7. The optical lens according to claim 1, wherein: The refractive index of the high refractive index film layer is NH, and the refractive index of the low refractive index film layer is NL, which meets the following conditions: 0.5≤NH-NL.

8. The optical lens according to claim 1, wherein: The filter lens has a wavelength difference of dWt50v4 at 50% transmittance of long wavelength visible light at 0 degrees and 40 degrees, which meets the following conditions: |dWt50v4|≤40nm.

9. The optical lens according to claim 1, wherein: The average transmittance of the filter lens at a wavelength of 350nm to 400nm is T3540, which meets the following conditions: T3540≤3％。 10. The optical lens according to claim 1, wherein: The transmittance of the filter lens at a wavelength of 850nm is T85, which meets the following conditions: T85≤3％。 11. The optical lens according to claim 10, wherein: The transmittance of the filter lens at a wavelength of 940nm is T94, which meets the following conditions: T94≤3％。 12. The optical lens according to claim 1, wherein: The near infrared light filtering coating is arranged on the image side surface of the filtering lens.

13. The optical lens according to claim 12, wherein: The filtering lens is the first optical lens.

14. The optical lens according to claim 1, wherein: The horizontal displacement of the filter lens at the maximum effective diameter position is SAG, and the center thickness of the filter lens is CT, which satisfies the following conditions: |SAG / CT|≤0.

7.

15. The optical lens according to claim 14, wherein: The horizontal displacement of the filter lens at the maximum effective diameter position is SAG, and the curvature radius of the filter lens at the center position is Rc, which satisfies the following conditions: |SAG / Rc|≤0.

1.

16. An imaging device, characterized in that: Include: The optical lens as claimed in claim 1; and An electronic photosensitive element is arranged on an imaging surface of the optical lens.

17. An electronic device, characterized in that: Include: The imaging device as claimed in claim 16.

18. An optical lens, characterized in that: Include: At least four optical lenses, which are respectively a first optical lens, a second optical lens, a third optical lens and a fourth optical lens from the object side to the image side of the optical lens; Wherein, at least one of the at least four optical lenses is a filter lens, the filter lens has a near-infrared light filtering coating, and at least one of the at least four optical lenses comprises a blue glass material; The near-infrared light filtering coating has at least one low refractive index film layer and at least one high refractive index film layer, and the near-infrared light filtering coating is a stacking of the high refractive index film layer and the low refractive index film layer alternately; The wavelength of the filter lens at 50% transmittance of long-wavelength visible light is Wt50v, the wavelength difference between 0 degree and 30 degree incident at 50% transmittance of long-wavelength visible light is dWt50v3, the average transmittance of the filter lens at wavelengths of 450nm to 630nm is T4563, and the average transmittance of the filter lens at wavelengths of 700nm to 1050nm is T70105, which meets the following conditions: 650nm≤Wt50v; |dWt50v3|≤20nm; 85% ≤ T4563; and T70105≤3％。 19. The optical lens according to claim 18, wherein: The total thickness of the low refractive index film layer is LtTk, and the total thickness of the high refractive index film layer is HtTk, which meets the following conditions: 1.4≤LtTk / HtTk.

20. The optical lens according to claim 19, wherein: The total number of layers of the near-infrared light filtering coating is tLs, which meets the following conditions: 65≤tLs.

21. The optical lens according to claim 20, wherein: The total thickness of the near-infrared light filtering coating is tTk, which meets the following conditions: tTk≤6500nm.

22. The optical lens according to claim 21, wherein: The filter lens has a wavelength difference of dWt50v4 at 50% transmittance of long wavelength visible light at 0 degrees and 40 degrees, which meets the following conditions: |dWt50v4|≤40nm.

23. The optical lens according to claim 18, wherein: The average transmittance of the filter lens at a wavelength of 450nm to 630nm is T4563, which meets the following conditions: 70％≤T4563。 24. The optical lens according to claim 23, wherein: The transmittance of the filter lens at a wavelength of 450nm is T45, which meets the following conditions: 80％≤T45。 25. The optical lens according to claim 24, wherein: The transmittance of the filter lens at a wavelength of 500nm is T50, which meets the following conditions: 80％≤T50。 26. The optical lens according to claim 25, wherein: The transmittance of the filter lens at a wavelength of 630nm is T63, which meets the following conditions: 80％≤T63。 27. The optical lens according to claim 26, wherein: The near infrared light filtering coating is arranged on the image side surface of the filtering lens, and the filtering lens comprises the blue glass material.

28. The optical lens according to claim 18, wherein: The total number of layers of the near-infrared light filtering coating is tLs, the total thickness of the near-infrared light filtering coating is tTk, the total thickness of the low refractive index film layer is LtTk, the total thickness of the high refractive index film layer is HtTk, the wavelength of the filtering lens at 50% transmittance of long-wavelength visible light is Wt50v, the wavelength difference between 0 degrees and 30 degrees of incidence at 50% transmittance of long-wavelength visible light of the filtering lens is dWt50v3, the wavelength difference between 0 degrees and 40 degrees of incidence at 50% transmittance of long-wavelength visible light of the filtering lens is The value is dWt50v4, the average transmittance of the filter lens at a wavelength of 450nm to 630nm is T4563, the average transmittance of the filter lens at a wavelength of 600nm to 650nm is T6065, the average transmittance of the filter lens at a wavelength of 700nm to 1050nm is T70105, the horizontal displacement of the filter lens at the maximum effective diameter position is SAG, the center thickness of the filter lens is CT, and the curvature radius of the filter lens at the center position is Rc, which meets the following conditions: 65≤tLs≤100; 6000nm≤tTk≤6200nm; 1.4≤LtTk / HtTk≤1.6; 670nm≤Wt50v≤690nm; 0≤|dWt50v3|≤15nm; 0≤|dWt50v4|≤35nm; 95％≤T4563≤100％； 95％≤T6065≤100％； 0％≤T70105≤1％； |SAG / CT|≤0.2; and |SAG / Rc|≤0.

02.

29. An imaging device, characterized in that: Include: The optical lens as claimed in claim 18; and An electronic photosensitive element is arranged on an imaging surface of the optical lens.

30. An electronic device, characterized in that: Include: The imaging device as claimed in claim 29.

Images