Optical filter and matching composite layer thereof

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, and more particularly to optical filters and matching composite layers thereof. [Background technology]

[0002] Conventional optical filters generally have a structure in which multiple refractive layers are sequentially laminated, and there is a large difference between the two types of refractive index. However, the structure of conventional optical filters is gradually unable to meet the diverse needs of modern times. Therefore, the inventor of the present invention believes that the above-mentioned shortcomings can be improved, and has proposed the present invention, which effectively improves the above-mentioned shortcomings through rational design combined with the application of scientific principles. Summary of the Invention [Problem to be solved by the invention]

[0003] SUMMARY OF THE DISCLOSURE The present invention provides an optical filter and a matching composite layer, which effectively improves upon the shortcomings that may occur in conventional optical filters. [Means for solving the problem]

[0004] An embodiment of the present invention discloses an optical filter, the optical filter comprising: a substrate; a bonding layer formed on the substrate and having a refractive index less than 1.42; and a matching composite layer formed on the bonding layer and having N film layers stacked in sequence, N being a positive integer. The N film layers comprise 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, and a plurality of third refractive layers each having a third refractive index greater than the second refractive index. The matching composite layer is in contact with the bonding layer with one of the third refractive layers and is defined as a first film layer. The matching composite layer is in contact with the first film layer with one of the first refractive layers and is defined as a second film layer. The matching composite layer is disposed at an end remote from the bonding layer with one of the first refractive layers and is defined as an Nth film layer. In the portion of the matching composite layer sandwiched between the second film layer and the Nth film layer, one of the first refractive layers is sandwiched between any two adjacent second refractive layers on the inside and two of the third refractive layers are sandwiched between them on the outside, and these are jointly defined as 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. M is a positive integer and is greater than 3. The optical filter can have a reflectance of 10% or less for light incident at an angle of 60 degrees from the normal direction and having a wavelength of 400 nm to 650 nm.

[0005] An embodiment of the present invention also discloses an optical filter, the optical filter comprising: a substrate; a bonding layer formed on the substrate; and a matching composite layer formed on the bonding layer and having N film layers stacked in sequence, N being a positive integer. The N film layers comprise 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, and a plurality of third refractive layers each having a third refractive index greater than the second refractive index. The matching composite layer is in contact with the bonding layer with one of the third refractive layers and is defined as a first film layer. The matching composite layer is in contact with the first film layer with one of the first refractive layers and is defined as a second film layer. The matching composite layer is disposed at an end remote from the bonding layer with one of the film layers and is defined as an Nth film layer. In the portion of the matching composite layer sandwiched between the second film layer and the Nth film layer, the first refractive layer is sandwiched between any two adjacent second refractive layers on the inside and the third refractive layers are sandwiched between them on the outside, which are jointly defined as a bidirectional incremental module, where the number of the bidirectional incremental modules included in the matching composite layer is at least M, and the bidirectional incremental modules are stacked in series with each other, where M is a positive integer and is greater than 3.

[0006] An embodiment of the present invention further discloses a matching composite layer of an optical filter, the matching composite layer including N film layers stacked in sequence, where N film layers are a positive integer. The N film layers include 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. The third refractive layer located at one end of the matching composite layer is defined as a first film layer. The matching composite layer is in contact with the first film layer with the first refractive layer and is defined as a second film layer. The film layer located at the other end of the matching composite layer is defined as an Nth film layer. In the portion of the matching composite layer sandwiched between the second film layer and the Nth film layer, the first refractive layer is sandwiched between two adjacent second refractive layers on the inside and two third refractive layers on the outside, which are jointly defined as a bidirectional incremental module. The number of the bidirectional incremental modules included in the matching composite layer is at least M, and they are stacked consecutively with each other, where 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 embodiment of the present invention are formed by continuously stacking M of the bidirectional incremental modules, which are different from the conventional ones, so that the refractive index of each of the bidirectional incremental modules gradually increases from the first refractive layer in both directions, thereby adjusting the refractive index distribution of the entire matching composite layer, thereby enabling the optical filter to be designed to meet more diverse and different requirements.

[0008] In order to make the features and technical contents of the present invention more readily apparent, reference is made to the following detailed description of the present invention and the accompanying drawings, which are provided for reference and explanation only and are not intended to limit the scope of the present invention. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a schematic plan view of an optical filter according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a specific layout diagram of FIG. 1. [Diagram 3] 3A-3C are schematic diagrams of simulation tests performed at different angles of the optical filter of FIG. 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The following describes the embodiment of the "optical filter and its matching composite layer" disclosed in the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the disclosure of this specification. The present invention can be implemented or applied in other different embodiments. Each detail in this specification can be modified and changed based on various aspects or applications without departing from the spirit of the present invention. In addition, the drawings of the present invention are for simple and schematic illustration only and do not show actual dimensions. In the following embodiments, the technical matters related to the present invention will be further described, but the disclosed contents do not limit the present invention. In addition, the term "or" used in this specification may include any one or more combinations of related items according to the actual situation.

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

[0012] Please refer to Figures 1 to 3. These are one embodiment of the present invention. This embodiment discloses an optical filter 1000, which preferably has a flat plate structure. In this embodiment, the optical filter 1000 can be applied to visible light (e.g., 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, for example, blue glass (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 stacked in sequence. The N film layers 10 are preferably stacked along the thickness direction H, and the side edges of the N film layers 10 are aligned with each other and preferably aligned with the side edge 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 multiple 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] More specifically, 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 indices. Each of the first refractive layers 10-1 has a first refractive index greater than the refractive index of the bonding layer 300. Each of the second refractive layers 10-2 has a second refractive index greater than the first refractive index, and each of the third refractive layers 10-3 has a third refractive index greater than the second refractive index.

[0016] In addition, in order 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 lamination. That is, the matching composite layer 100 is in contact with the coupling layer 300 through one of the third refractive layers 10-3, and is defined as a first film layer 1. The matching composite layer 100 is in contact with the first film layer 1 through one of the first refractive layers 10-1, and is defined as a second film layer 2. The matching composite layer 100 is disposed at an end far from the coupling layer 300 through one of the film layers 10, and is defined as an 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 can also be selected from other materials (for example, the second refractive layer 10-2 or the third refractive layer 10-3) according to actual requirements.

[0017] In this embodiment, the refractive index of the bonding layer 300 is less than 1.42 (e.g., 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 indexes, thereby providing more diverse optical configurations and structures.

[0018] In order to facilitate understanding of the present embodiment, the bonding layer 300, the first refractive layer 10-1, the second refractive layer 10-2, and the third refractive layer 10-3 are described below using one possible material as an example, but the present invention is not limited thereto. The bonding layer 300 is, for example, a magnesium fluoride (MgF2) layer, the first refractive layer 10-1 is, for example, a silicon dioxide (SiO2) layer, the second refractive layer 10-2 is, for example, an aluminum oxide (Al2O3) layer, and the third refractive layer 10-3 is, for example, a titanium dioxide (TiO2) layer, but the present invention is not limited thereto. For example, in another embodiment of the present invention not shown, the bonding layer 300 is not limited to a material with a refractive index less than 1.42, and the bonding layer 300 can select 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) according to actual requirements. That is, 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 Nth film layer N, one of the first refractive layers 10-1 is sandwiched inside any two of the adjacent second refractive layers 10-2, and two of the third refractive layers 10-3 are sandwiched between them on the outside, thereby jointly defining a bidirectional incremental module 10a.

[0020] In addition, the number of the bidirectional incremental modules 10a included in the matching composite layer 100 is at least M, and they are arranged in a continuous stacking manner. In this embodiment, the M bidirectional incremental modules 10a arranged in a continuous stacking manner are from the third film layer 3 to the N-1th 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 can also be greater than N / 4.

[0021] As a result, in any one of the bidirectional incremental modules 10a, 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, thereby enabling the refractive index to exhibit a gradually increasing distribution.

[0022] Based on the above, in this embodiment, the optical filter 1000 forms M bidirectional incremental modules 10a that are stacked consecutively, which is different from the conventional method, and the refractive index of each bidirectional incremental module 10a gradually increases in opposite directions from the first refractive layer 10-1, thereby adjusting the refractive index distribution of the entire matching composite layer 100, and further enabling the optical filter 1000 to be designed according to more diverse different requirements.

[0023] To explain further, in order for the optical filter 1000 disclosed in this embodiment to have low reflectance when light from a perpendicularly incident light source (e.g., light having a wavelength of 400 nm to 720 nm) is incident at an angle of between 30 degrees and 60 degrees, it is preferable that the matching composite layer 100 satisfies at least some 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, which is preferably 320 nm to 380 nm. In addition, in this embodiment, the bidirectional incremental modules 10a 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), but 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 desired optical effect, any two adjacent bidirectional incremental modules 10a share one common third refractive layer 10-3 in this embodiment, and have a shared thickness T10a-1. More specifically, the sum of the module thicknesses T10a of the 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 bidirectional incremental modules 10a is 20% to 25% of the total thicknesses T10a of the bidirectional incremental modules 10a, so that 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 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 preferred optical effect through its bidirectionally increasing refractive index, it is preferable that each of the bidirectional incremental modules 10a satisfy 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 thicknesses of the first refractive layer 10-1 and 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. In addition, in the plurality of bidirectional incremental modules 10a, the difference between the minimum thickness and the maximum thickness of the first refractive layer 10-1 does not exceed 15 nm.

[0028] More specifically, the bonding layer 300 and the matching composite layer 100 of the optical filter 1000 are arranged as shown in FIG. 2 in this embodiment, and the corresponding simulation test is performed, and the results shown in FIG. 3 are obtained.

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

[0030] [Technical Effects of the Embodiments of the Present Invention] As described above, the optical filter and its matching composite layer disclosed in the embodiment of the present invention form M bidirectional incremental modules stacked consecutively with each other, which is different from the conventional bidirectional incremental modules, and the refractive index of each bidirectional incremental module gradually increases from the first refractive layer in the opposite direction, thereby adjusting the refractive index distribution of the entire matching composite layer, and further enabling the optical filter to be designed according to more diverse different requirements.

[0031] The above disclosure is merely a preferred embodiment of the present invention, and does not limit the scope of the claims of the present invention. Therefore, all equivalent technical modifications made based on the contents of the specification and accompanying drawings of the present invention shall be included in the scope of the claims of the present invention. [Explanation of symbols]

[0032] 1000 Optical Filters 100 Matching Composite Layers 10 membrane layers 10-1 First refractive layer 10-2 Second Refraction Layer 10-3 Third Refraction Layer 1. First membrane layer 2 Second membrane layer 3. Third membrane layer N Nth membrane layer N-1 N-1 membrane layer 10a Bidirectional Incremental Module 200 Substrates 300 bonding layer T10a module thickness T10a-1 Shared Thickness T100 Total Thickness H Thickness direction A0, A30, A40, A50, A60 curves

Claims

1. A substrate; a bonding layer formed on the substrate and having a refractive index of less than 1.42; a matching composite layer formed on the bonding layer and having N film layers stacked in sequence, N being a positive integer; An optical filter comprising: 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; Including, The matching composite layer is in contact with the bonding layer with one of the third refractive layers and is defined as a first film layer, the matching composite layer is in contact with the first film layer with one of the first refractive layers and is defined as a second film layer, and the matching composite layer is disposed at an end away from the bonding layer with one of the first refractive layers and is defined as an Nth film layer; In a portion of the matching composite layer located between the second film layer and the Nth film layer, any two adjacent second refractive layers have one first refractive layer sandwiched between them on the inside and two third refractive layers 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 the bidirectional incremental modules are arranged in a stacked manner in series with each other, 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 an angle of 60 degrees from the normal direction and having a wavelength of 400 nm to 650 nm. An optical filter comprising:

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

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

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

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

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

7. 2. The optical filter of 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. 2. The optical filter of claim 1, wherein a difference between a minimum thickness and a maximum thickness of the first refractive layer in a plurality of the bidirectional incremental modules is 15 nm or less.

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

8.

12. A substrate; a bonding layer formed on the substrate; a matching composite layer formed on the bonding layer and having N film layers stacked in sequence, N being a positive integer; 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; Including, The matching composite layer is in contact with the bonding layer with one of the third refractive layers and is defined as a first film layer, the matching composite layer is in contact with the first film layer with one of the first refractive layers and is defined as a second film layer, and the matching composite layer is disposed at an end away from the bonding layer with one of the film layers and is defined as an Nth film layer; In a portion of the matching composite layer located between the second film layer and the Nth film layer, any two adjacent second refractive layers are sandwiched between one first refractive layer and two adjacent 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 stacked consecutively with each other, where M is a positive integer and M is greater than 3. An optical filter comprising:

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

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

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

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

17. A matching composite layer comprising N film layers stacked in sequence, N being a positive integer, 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 The third refractive layer located at one end of the matching composite layer is defined as a first film layer, the matching composite layer is in contact with the first film layer with the first refractive layer and is defined as a second film layer, and the film layer located at the other end of the matching composite layer is defined as an Nth film layer; In a portion of the matching composite layer located between the second film layer and the Nth film layer, one of the first refractive layers is sandwiched between any two of the adjacent second refractive layers on the inside and two of the third refractive layers 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 stacked consecutively with each other, where M is a positive integer and M is greater than 3. . .the matching composite layer.

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

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

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

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