Optical filters and their matching composite layers

Abstract

To provide an optical filter and a matching composite layer thereof for enabling a design to meet a wider variety of different requirements.SOLUTION: A matching composite layer includes a plurality of first refraction layers, a plurality of second refraction layers, and a plurality of third refraction layers. A refractive index of the second refraction layer is greater than a refractive index of the first refraction layer and is less than a refractive index of the third refraction layer. Any two of the adjacent second refraction layers sandwich the first refraction layer and are sandwiched between two of the third refraction layers, thereby jointly defining a bidirectional incremental module. The number of bidirectional incremental modules included in the matching composite layer is at least M, and the M bidirectional incremental modules are stacked in sequence and arranged. M is a positive integer, and M is greater than three.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to filters, particularly optical filters and their matching composite layers.

Background Art

[0002] Conventional optical filters generally have a structure in which a plurality of refractive layers are sequentially laminated, and there is a large difference between the two types of refractive indices. However, the configuration of conventional optical filters is gradually becoming unable to meet modern diverse needs. Therefore, the inventor of the present invention considered that the above-mentioned drawbacks could be improved, and in combination with the application of scientific principles, proposed the present invention that effectively improves the above-mentioned drawbacks through reasonable design.

Summary of the Invention

Problems to be Solved by the Invention

[0003] Embodiments of the present invention provide an optical filter and its matching composite layer, and aim to effectively improve the drawbacks that may occur in conventional optical filters.

Means for Solving the Problems

[0004] Embodiments of the present invention disclose an optical filter comprising: a substrate; a coupling layer formed on the substrate having a refractive index of less than 1.42; and a matching composite layer formed on the coupling layer and having N sequentially stacked film layers, where N is a positive integer. The N film layers each comprise: a plurality of first refractive layers each having a first refractive index greater than the refractive index of the coupling layer; a plurality of second refractive layers each having a second refractive index greater than the first refractive index; and a plurality of third refractive layers each having a third refractive index greater than the second refractive index. The matching composite layer is defined as a first film layer, with one of the third refractive layers in contact with the coupling layer. The matching composite layer is defined as a second film layer, with one of the first refractive layers in contact with the first film layer. The matching composite layer is defined as an Nth film layer, with one of the first refractive layers located at an end away from the coupling layer. In the portion of the matching composite layer sandwiched between the second film layer and the N film layer, one first refractive layer is sandwiched inside any two adjacent second refractive layers, and two third refractive layers are sandwiched between them on the outside, and these are collectively defined as a bidirectional incremental module. The number of these bidirectional incremental modules included in the matching composite layer is at least M, and they are arranged in a continuous stack. M is a positive integer, and M is greater than 3. The optical filter can have a reflectance of 10% or less for light rays incident at an angle of 60 degrees from the normal direction and with wavelengths between 400 nm and 650 nm.

[0005] Embodiments of the present invention also disclose an optical filter, the optical filter comprising a substrate, a coupling layer formed on the substrate, and a matching composite layer formed on the coupling layer and sequentially stacked, wherein N is a positive integer. The N film layers each comprise a plurality of first refractive layers having a first refractive index greater than the refractive index of the coupling layer, a plurality of second refractive layers each having a second refractive index greater than the first refractive index, and a plurality of third refractive layers each having a third refractive index greater than the second refractive index. The matching composite layer is defined as a first film layer, with one of the third refractive layers in contact with the coupling layer. The matching composite layer is defined as a second film layer, with one of the first refractive layers in contact with the first film layer. The matching composite layer is defined as an Nth film layer, with one of the film layers located at the end away from the coupling layer. In the portion of the matching composite layer sandwiched between the second film layer and the N film layer, one first refractive layer is sandwiched inside any two adjacent second refractive layers, and two third refractive layers are sandwiched between them on the outside, and these are collectively defined as a bidirectional incremental module. Here, the number of bidirectional incremental modules included in the matching composite layer is at least M, and they are arranged in a continuous stack. M is a positive integer, and M is greater than 3.

[0006] Embodiments of the present invention further disclose a matching composite layer of an optical filter, the matching composite layer comprising N film layers, which are sequentially stacked and are a positive integer. The N film layers comprise a plurality of first refractive layers, each having a first refractive index; a plurality of second refractive layers, each having a second refractive index greater than the first refractive index; and a plurality of third refractive layers, each having a third refractive index greater than the second refractive index. One of the third refractive layers located at one end of the matching composite layer is defined as the first film layer. The matching composite layer is defined as a second film layer, with one of the first refractive layers in contact with the first film layer. One of the film layers located at the other end of the matching composite layer is defined as the Nth film layer. In the portion of the matching composite layer sandwiched between the second film layer and the N film layer, one first refractive layer is sandwiched between two adjacent second refractive layers, and two third refractive layers are sandwiched between them on the outside, and these are collectively defined as a bidirectional incremental module. The number of these bidirectional incremental modules included in the matching composite layer is at least M, and they are arranged in a continuous stack. M is a positive integer, and M is greater than 3.

[0007] Based on the above, the optical filter and its matching composite layer disclosed in the embodiments of the present invention are formed by stacking M of the bidirectional incremental modules in succession, which differs from conventional methods. As a result, the refractive index of each bidirectional incremental module gradually increases in both directions from the first refractive layer, thereby adjusting the refractive index distribution of the entire matching composite layer, and enabling the optical filter to be designed to meet a wider variety of different requirements.

[0008] To further understand the features and technical content of the invention, please refer to the detailed description of the present invention and the accompanying drawings below. However, the accompanying drawings provided are for reference and illustrative purposes only and are not intended to limit the scope of the claims of the present invention. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic plan view of an optical filter according to an embodiment of the present invention. [Figure 2] Figure 1 is a detailed layout diagram. [Figure 3] Figure 2 is a schematic diagram of simulation tests performed at different angles of the optical filter. [Modes for carrying out the invention]

[0010] Embodiments of the “optical filter and matching composite layer” disclosed herein will be described below. Those skilled in the art will be able to understand the merits and effects of the present invention from the published content herein. The present invention can be carried out or applied by other different embodiments. Each section herein can also be modified and altered in equal measure from various viewpoints or applications, as long as it does not deviate from the spirit of the invention. Furthermore, the drawings of the present invention are for simple and schematic purposes only and do not indicate actual dimensions. Further technical details of the present invention will be described in the following embodiments, but the published content does not limit the present invention. Furthermore, the term “or” as used herein may include any one or more combinations of the relevant items, depending on the actual situation.

[0011] Throughout this specification, terms such as “first,” “second,” and “third” may be used to describe various components and signals, but it should be understood that these components and signals should not be limited by these terms. These terms are primarily used to distinguish one component from another, or one signal from another. Furthermore, the term “or” as used herein may, as appropriate, include any one or a combination of the relevant enumerated items.

[0012] Please refer to Figures 1 to 3. These are embodiments of one embodiment of the present invention. This embodiment reveals an optical filter 1000, which preferably has a flat plate-like structure. In this embodiment, the optical filter 1000 can be applied to visible light (for example, 420 nm to 720 nm).

[0013] In this embodiment, the optical filter 1000 includes a substrate 200, a bonding layer 300 formed on the substrate 200, and a matching composite layer 100 formed on the bonding layer 300. The substrate 200 is, for example, a glass substrate, such as blue glass (or IR cut glass). The matching composite layer 100 is bonded to the substrate 200 via the bonding layer 300, but the present invention is not limited thereto. For example, in other embodiments of the present invention not shown, the matching composite layer 100 can be used in combination with other components.

[0014] Specifically, the matching composite layer 100 has N film layers 10 that are stacked sequentially. Preferably, the N film layers 10 are stacked along their thickness direction H, and the side edges of the N film layers 10 are aligned with each other, and further preferably with the side edges of the bonding layer 300. N is a positive integer (for example, N is limited to 30 to 80), and in this embodiment, N is described as 44 (that is, in this embodiment, the plurality of film layers 10 and the bonding layer 300 are described as a total of 45 layers), but the present invention is not limited thereto.

[0015] Furthermore, the N film layers 10 are classified into a plurality of first refractive layers 10-1, a plurality of second refractive layers 10-2, and a plurality of third refractive layers 10-3 based on their refractive index. Each of the first refractive layers 10-1 has a first refractive index greater than that of the bonding layer 300. Each of the second refractive layers 10-2 has a second refractive index greater than that of the first refractive index, and each of the third refractive layers 10-3 has a third refractive index greater than that of the second refractive index.

[0016] Furthermore, to facilitate understanding of the overall arrangement of the matching composite layer 100, the multiple film layers 10 can also be described in the order of their stacking. That is, the matching composite layer 100 is in contact with the bonding layer 300 by one third refractive layer 10-3 and is defined as the first film layer 1. The matching composite layer 100 is in contact with the first film layer 1 by one first refractive layer 10-1 and is defined as the second film layer 2. The matching composite layer 100 is located at the end away from the bonding layer 300 by one film layer 10 and is defined as the nth film layer N. Here, the nth film layer N is described using the first refractive layer 10-1 in this embodiment, but in other embodiments of the present invention not shown, the nth film layer N may be made of other materials (for example, the second refractive layer 10-2 or the third refractive layer 10-3) as required by the actual requirements.

[0017] In this embodiment, the refractive index of the bonding layer 300 is less than 1.42 (for example, 1.35 to 1.42), the first refractive index is 1.35 to 1.58, the second refractive index is 1.62 to 1.93, and the third refractive index is 2.0 to 2.8. That is, in this embodiment, the optical filter 1000 employs and stacks four optical layers having different refractive indices, thereby providing a wider variety of optical arrangements and structures.

[0018] For the purpose of making this embodiment easier to understand, the bonding layer 300, the first refractive layer 10-1, the second refractive layer 10-2, and the third refractive layer 10-3 will be described below using one example material, but the present invention is not limited thereto. The bonding layer 300 may be, for example, a magnesium fluoride (MgF2) layer, the first refractive layer 10-1 may be, for example, a silicon dioxide (SiO2) layer, the second refractive layer 10-2 may be, for example, an aluminum oxide (Al2O3) layer, and the third refractive layer 10-3 may be, for example, a titanium dioxide (TiO2) layer, but the present invention is not limited thereto. For example, in other embodiments of the present invention not shown, the bonding layer 300 is not limited to a material with a refractive index of less than 1.42, and the bonding layer 300 may be made of other materials (for example, any of the first refractive layer 10-1, the second refractive layer 10-2, or the third refractive layer 10-3) as required by the actual requirements. In other words, the first refractive index may be less than or equal to the refractive index of the bonding layer 300.

[0019] Furthermore, in the portion of the matching composite layer 100 sandwiched between the second film layer 2 and the N film layer N, one first refractive layer 10-1 is sandwiched inside any two adjacent second refractive layers 10-2, and two third refractive layers 10-3 are sandwiched between them on the outside, thus collectively defining a bidirectional incremental module 10a.

[0020] Furthermore, the number of bidirectional incremental modules 10a included in the matching composite layer 100 is at least M, and these are arranged in a continuous stack. In this embodiment, the M bidirectional incremental modules 10a arranged in a continuous stack are from the third film layer 3 to the N-1 film layer N-1 of the matching composite layer 100. M is a positive integer greater than 3, and in this embodiment, M is described as 10, but the present invention is not limited thereto. That is, in this embodiment, M is described as being greater than N / 5, but in other embodiments of the present invention not shown, M may be greater than N / 4.

[0021] As a result, in any one of the bidirectional incremental modules 10a, when any one of the second refractive layers 10-2 is sandwiched between one of the first refractive layers 10-1 and one of the third refractive layers 10-3, a distribution showing a gradual increase in refractive index can be exhibited.

[0022] Based on the above, in the present embodiment, the optical filter 1000 forms M mutually continuously stacked bidirectional incremental modules 10a different from the conventional ones, and the refractive index of each bidirectional incremental module 10a gradually increases in both directions opposite to each other from the first refractive layer 10-1. As a result, the refractive index distribution of the entire matching composite layer 100 is adjusted, and further enables the optical filter 1000 to be designed according to more diverse different requirements.

[0023] To further explain, when the optical filter 1000 disclosed in the present embodiment is incident in a state deflected between 30 degrees and 60 degrees with respect to a vertically incident light source (for example, light having a wavelength of 400 nm to 720 nm), in order to have a low reflectance, it is preferable that the matching composite layer 100 satisfies at least a part of the following arrangement conditions, but the present invention is not limited thereto.

[0024] In this embodiment, each of the bidirectional incremental modules 10a has a module thickness T10a, and the thickness is preferably 320 nm to 380 nm. Further, in this embodiment, the plurality of bidirectional incremental modules 10a each adopt different module thicknesses T10a (for example, 376.49 mm, 364.05 mm, 372.95 mm, 354.67 mm, 332.94 mm, 324.5 mm, 325.44 mm, 326.12 mm, 325.09 mm, and 336.59 mm). However, the module thicknesses T10a of any two of the bidirectional incremental modules 10a can be adjusted to be different or the same according to actual needs, but the present invention is not limited thereto.

[0025] Furthermore, in order to precisely control the optical filter 1000 within a predetermined thickness to achieve a preferable optical effect, any two adjacent bidirectional incremental modules 10a share one common third refractive layer 10-3 and have a shared thickness T10a-1 in this embodiment. Furthermore, the sum of the module thicknesses T10a of the plurality of bidirectional incremental modules 10a exceeds the total thickness T100 of the matching composite layer 100. The sum of the shared thicknesses T10a-1 of the plurality of bidirectional incremental modules 10a is 20% to 25% of the sum of the plurality of module thicknesses T10a, whereby the total thickness T100 of the matching composite layer 100 can be effectively controlled. In this embodiment, the sum of the module thicknesses T10a of the plurality of bidirectional incremental modules 10a can be controlled to be 105% to 140% of the total thickness T100 of the matching composite layer 100, but the present invention is not limited thereto.

[0026] From another perspective, in order for each of the bidirectional incremental modules 10a to achieve a preferable optical effect by its refractive index increasing in both directions, it is preferable that each of the bidirectional incremental modules 10a satisfies at least some of the following arrangement conditions, but the present invention is not limited thereto.

[0027] Specifically, in each of the bidirectional incremental modules 10a, the thicknesses of the two second refractive layers 10-2 are smaller than the thickness of the first refractive layer 10-1 and the thickness of any one of the third refractive layers 10-3. The difference in thickness between the two second refractive layers 10-2 is less than 10 nm, and the difference in thickness between the two third refractive layers 10-3 is less than 15 nm. Furthermore, in multiple bidirectional incremental modules 10a, the difference between the minimum and maximum thickness of the first refractive layer 10-1 does not exceed 15 nm.

[0028] More specifically, in this embodiment, the coupling layer 300 and the matching composite layer 100 of the optical filter 1000 are arranged in the specific configuration shown in Figure 2, and the results of corresponding simulation tests are shown in Figure 3.

[0029] As a result, as shown in curve A30 of Figure 3, the optical filter 1000 can have a reflectance of 1% or less (e.g., about 0.69%) for light rays incident at a 30-degree angle from the normal direction with a wavelength of 400 nm to 720 nm. For example, as shown in curve A40 of Figure 3, the optical filter 1000 can have a reflectance of 1.5% or less (e.g., about 1.1%) for light rays incident at a 40-degree angle from the normal direction with a wavelength of 400 nm to 720 nm. Furthermore, as shown in curve A60 of Figure 3, the optical filter 1000 can have a reflectance of 10% or less (e.g., about 7.2%) for light rays incident at a 60-degree angle from the normal direction with a wavelength of 400 nm to 650 nm. In addition, curve A0 of Figure 3 shows the reflectance of the optical filter 1000 for light rays incident along the normal direction.

[0030] [Technical Effects of Embodiments of the Present Invention] As described above, the optical filter and its matching composite layer disclosed in the embodiments of the present invention form M bidirectional incremental modules that are stacked continuously with respect to each other, unlike conventional designs, and the refractive index of each bidirectional incremental module increases gradually in the opposite direction from the first refractive layer, thereby adjusting the refractive index distribution of the entire matching composite layer and enabling the optical filter to be designed to meet a wider variety of different requirements.

[0031] The information disclosed above represents only preferred embodiments of the present invention and does not limit the scope of the claims. Therefore, all equivalent technical modifications made based on the specifications and accompanying drawings of the present invention are included within the scope of the claims. [Explanation of Symbols]

[0032] 1000 Optical Filters 100 Matching Composite Layers 10 membrane layers 10-1 The first refractive layer 10-2 The second refractive layer 10-3 The third refractive layer 1. First film layer 2. Second film layer 3. Third film layer Nth layer N-1 The N-1 film layer 10a Bidirectional Incremental Module 200 circuit boards 300 bonding layer T10a module thickness T10a-1 Shared Thickness T100 Total Thickness H thickness direction A0, A30, A40, A50, A60 curve

Claims

1. circuit board and A bonding layer formed in contact with the substrate and having a refractive index of less than 1.42, A matching composite layer having N positive integer film layers formed in contact with the aforementioned bonding layer and sequentially stacked, An optical filter equipped with, The N film layers in the matching composite layer are A plurality of first refractive layers, each having a first refractive index greater than the refractive index of the bonding layer, A plurality of second refractive layers, each having a second refractive index greater than the first refractive index, A plurality of third refractive layers, each having a third refractive index greater than the second refractive index, Includes, The matching composite layer is defined as a first film layer, having one third refractive layer in contact with the bonding layer; the matching composite layer is defined as a second film layer, having one first refractive layer in contact with the first film layer; and the matching composite layer is defined as an Nth film layer, having one first refractive layer located at an end away from the bonding layer. In the portion of the matching composite layer located in contact with the second film layer and the N film layer, one first refractive layer is sandwiched between any two adjacent second refractive layers, and two third refractive layers are sandwiched between them on the outside, thereby jointly defining a bidirectional incremental module. The number of the bidirectional incremental modules included in the matching composite layer is at least M, and they are arranged in a continuous stack, where M is a positive integer and M is greater than 3. The optical filter can have a reflectance of 10% or less for light rays incident at a 60-degree angle from the normal direction and having a wavelength of 400 nm to 650 nm. An optical filter characterized by the following features.

2. The optical filter according to claim 1, wherein any two adjacent bidirectional incremental modules share one third refractive layer, and N is between 30 and 80.

3. The optical filter according to claim 1, wherein any two adjacent bidirectional incremental modules share one third refractive layer, each bidirectional incremental module has a module thickness, and the sum of the module thicknesses of the plurality of bidirectional incremental modules exceeds the total thickness of the matching composite layer.

4. The optical filter according to claim 1, wherein any two adjacent bidirectional incremental modules share one third refractive layer, each bidirectional incremental module has a module thickness, and the sum of the module thicknesses of the plurality of bidirectional incremental modules is 105% to 140% of the total thickness of the matching composite layer.

5. The optical filter according to claim 1, wherein any two adjacent bidirectional incremental modules share one third refractive layer, the third refractive layer has a shared thickness, each bidirectional incremental module has a module thickness, and the sum of the shared thicknesses of the plurality of bidirectional incremental modules is 20% to 25% of the sum of the module thicknesses of the plurality of modules.

6. The optical filter according to any one of claims 3 to 5, wherein the module thickness of each of the bidirectional incremental modules is 320 nm to 380 nm.

7. The optical filter according to claim 1, wherein in each of the bidirectional incremental modules, the thicknesses of the two second refractive layers are each smaller than the thickness of the first refractive layer and smaller than the thickness of any one of the third refractive layers.

8. The optical filter according to claim 1, wherein in a plurality of the bidirectional incremental modules, the difference between the minimum and maximum thickness of the first refractive layer is 15 nm or less.

9. The optical filter according to claim 1, wherein in each of the bidirectional incremental modules, the difference in thickness between the two second refractive layers is less than 10 nm.

10. The optical filter according to claim 1, wherein in each of the bidirectional incremental modules, the difference in thickness between the two third refractive layers is less than 15 nm.

11. The optical filter according to claim 1, wherein the refractive index of the bonding layer is 1.35 to 1.42, the first refractive index is 1.35 to 1.58, the second refractive index is 1.62 to 1.93, and the third refractive index is 2.0 to 2.

8.

12. circuit board and A bonding layer formed in contact with the substrate, A matching composite layer having N positive integer film layers formed in contact with the aforementioned bonding layer and sequentially stacked, Equipped with, The N film layers in the matching composite layer are A plurality of first refractive layers, each having a first refractive index greater than the refractive index of the bonding layer, A plurality of second refractive layers, each having a second refractive index greater than the first refractive index, A plurality of third refractive layers, each having a third refractive index greater than the second refractive index, Includes, The matching composite layer is defined as a first film layer, having one third refractive layer in contact with the bonding layer; the matching composite layer is defined as a second film layer, having one first refractive layer in contact with the first film layer; and the matching composite layer is defined as an Nth film layer, having one film layer located at an end away from the bonding layer. In the portion of the matching composite layer located in contact with the second film layer and the N film layer, one first refractive layer is sandwiched between any two adjacent second refractive layers, and these are sandwiched between two outer third refractive layers, thereby jointly defining a bidirectional incremental module. The number of the bidirectional incremental modules included in the matching composite layer is at least M, and they are arranged in a continuous stack, where M is a positive integer and M is greater than 3. An optical filter characterized by the following features.

13. The optical filter according to claim 12, wherein any two adjacent bidirectional incremental modules share one third refractive layer, and N is between 30 and 80.

14. The optical filter according to claim 12, wherein any two adjacent bidirectional incremental modules share one third refractive layer, each bidirectional incremental module has a module thickness, and the sum of the module thicknesses of the plurality of bidirectional incremental modules exceeds the total thickness of the matching composite layer.

15. The optical filter according to claim 12, wherein in each of the bidirectional incremental modules, the thicknesses of the two second refractive layers are each smaller than the thickness of the first refractive layer and smaller than the thickness of any one of the third refractive layers, and in each of the bidirectional incremental modules, the difference in thickness between the two second refractive layers is less than 10 nm and the difference in thickness between the two third refractive layers is less than 15 nm.

16. The optical filter according to claim 15, wherein in a plurality of the bidirectional incremental modules, the difference between the minimum and maximum thickness of the first refractive layer is 15 nm or less.

17. A matching composite layer comprising N film layers, where N is a positive integer, which are stacked sequentially. The N film layers are, A plurality of first refractive layers, each having a first refractive index, A plurality of second refractive layers, each having a second refractive index greater than the first refractive index, A plurality of third refractive layers, each having a third refractive index greater than the second refractive index, Equipped with, A third refractive layer located at one end of the matching composite layer is defined as the first film layer, the matching composite layer is in contact with the first film layer by a first refractive layer and is defined as the second film layer, and a film layer located at the other end of the matching composite layer is defined as the Nth film layer. In the portion of the matching composite layer located in contact with the second film layer and the N film layer, one first refractive layer is sandwiched between any two adjacent second refractive layers, and two third refractive layers are sandwiched between them on the outside, thereby jointly defining a bidirectional incremental module. The number of the bidirectional incremental modules included in the matching composite layer is at least M, and they are arranged in a continuous stack, where M is a positive integer and M is greater than 3. A matching composite layer characterized by the following features.

18. The matching composite layer according to claim 17, wherein any two adjacent bidirectional incremental modules share one third refractive layer, and N is between 30 and 80.

19. The matching composite layer according to claim 17, wherein any two adjacent bidirectional incremental modules share one third refractive layer, the third refractive layer having a shared thickness, each bidirectional incremental module having a module thickness, and the sum of the shared thicknesses of the plurality of bidirectional incremental modules is 20% to 25% of the sum of the module thicknesses of the plurality of modules.

20. The matching composite layer according to claim 19, wherein any two adjacent bidirectional incremental modules share one third refractive layer, each bidirectional incremental module has a module thickness, the sum of the module thicknesses of the plurality of bidirectional incremental modules is 105% to 140% of the total thickness of the matching composite layer, and the module thickness of each bidirectional incremental module is 320 nm to 380 nm.

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