Optical filter

Abstract

An optical filter includes a substrate, a bonding layer formed on the substrate, and a matching composite layer formed on the bonding layer. The matching composite layer includes a plurality of first refractive layers, a plurality of second refractive layers, and a plurality of third refractive layers. The number of the second refraction layers is smaller than that of the first refraction layers and smaller than that of the third refraction layers. The refractive index of the first refraction layer is larger than that of the bonding layer, and the refractive index of the second refraction layer is larger than that of the first refraction layer and smaller than that of the third refraction layer. One first refraction layer is clamped between the inner sides of the two adjacent second refraction layers, and the outer sides of the two adjacent second refraction layers are clamped between the two third refraction layers, so that a two-way progressive increase module is jointly defined. Therefore, the optical filter is provided with the two-way increasing module, so that the overall refractive index distribution is adjusted, and more different requirements can be met.

Description

Technical Field

[0001] The present invention relates to a filter, in particular to an optical filter. Background Art

[0002] Existing optical filters often use multiple refractive layers stacked in sequence, and the difference between the two refractive indices they have is relatively large. However, the configuration and structure of existing optical filters have gradually failed to meet the different needs of today. Therefore, the inventors believe that the above defects can be improved, and have devoted themselves to research and applied scientific principles, and finally proposed a reasonable design and effective improvement of the above defects of the present invention. Summary of the invention

[0003] An embodiment of the present invention provides an optical filter, which can effectively improve the defects that may occur in the existing optical filter.

[0004] The embodiment of the present invention discloses an optical filter, which includes: a substrate; a bonding layer formed on the substrate, and the refractive index of the bonding layer is less than 1.42; and a matching composite layer formed on the bonding layer, and the matching composite layer has N film layers stacked in sequence, N is a positive integer; wherein the N film layers include: 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; wherein the number of the plurality of second refractive layers is less than the number of the plurality of first refractive layers; and a plurality of third refractive layers, each having a third refractive index greater than the second refractive index; wherein the number of the plurality of second refractive layers is less than the number of the plurality of third refractive layers; wherein the matching composite layer is connected to the bonding layer with a third refractive layer and is defined as a first film layer; the matching composite layer is configured with a first refractive layer at the end away from the bonding layer and is defined as an Nth film layer; wherein a first refractive layer is sandwiched between the inner sides of two adjacent second refractive layers, and two third refractive layers are sandwiched between them on the outer sides, thereby collectively defining a bidirectional incremental module.

[0005] Preferably, a second refractive layer away from the bidirectional increasing module is sandwiched between a first refractive layer and a third refractive layer, thereby collectively defining a unidirectional increasing module.

[0006] Preferably, a first refractive layer is arranged between the bidirectional increasing module and the first film layer, and the unidirectional increasing module is connected to the Nth film layer.

[0007] Preferably, the bidirectional increasing module is located adjacent to the first film layer, and the unidirectional increasing module is located adjacent to the Nth film layer.

[0008] Preferably, the number and thickness of the film layers arranged between the bidirectional increasing module and the first film layer are different from the number and thickness of the film layers arranged between the unidirectional increasing module and the Nth film layer.

[0009] Preferably, the thickness of the bidirectional increasing module is 165% to 180% of the thickness of the unidirectional increasing module, and the thickness of any second refractive layer of the bidirectional increasing module is greater than the thickness of the second refractive layer of the unidirectional increasing module.

[0010] Preferably, the refractive index of the bonding layer is between 1.35 and 1.42, the first refractive index is between 1.45 and 1.52, the second refractive index is between 1.62 and 1.71, and the third refractive index is between 2.2 and 2.8.

[0011] Preferably, N is further defined as being between 30 and 50, and the number of the plurality of second refractive layers is defined as only three.

[0012] The embodiment of the present invention also discloses an optical filter, which includes: a substrate; a bonding layer formed on the substrate, and the refractive index of the bonding layer is less than 1.42; and a matching composite layer formed on the bonding layer, and the matching composite layer has N film layers stacked in sequence, N is a positive integer; wherein the N film layers include: a plurality of first refractive layers, each having a first refractive index greater than the refractive index of the bonding layer; a second refractive layer, 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; wherein the matching composite layer is connected to the bonding layer with a third refractive layer and is defined as a first film layer; the matching composite layer is configured with a first refractive layer at the end away from the bonding layer and is defined as an Nth film layer; wherein the second refractive layer is sandwiched between a first refractive layer and a third refractive layer, and thus together defined as a unidirectional incremental module.

[0013] Preferably, N is further defined as being between 30 and 50, and the number of the second refractive layer is defined as only a single one.

[0014] The embodiment of the present invention further discloses an optical filter, which includes: a substrate having a first plate surface and a second plate surface respectively located on opposite sides thereof; a bonding layer formed on the first plate surface of the substrate, and the refractive index of the bonding layer is less than 1.42; and a matching composite layer formed on the bonding layer and the second plate surface of the substrate, and the matching composite layer has a plurality of film layers, which include: 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; wherein the number of the plurality of second refractive layers is less than the number of the plurality of first refractive layers; and a plurality of third refractive layers, each having a second refractive index greater than the second refractive index. a third refractive index; wherein the number of the plurality of second refractive layers is less than the number of the plurality of third refractive layers; wherein the plurality of film layers include N forward film layers sequentially stacked on the combining layer and M reverse film layers sequentially stacked on the second plate surface, wherein N and M are both positive integers; the N forward film layers are connected to the combining layer via a third refractive layer and are defined as a first forward film layer; the N forward film layers are configured with a first refractive layer at the end away from the combining layer and are defined as an Nth forward film layer; wherein, among the N forward film layers, a first refractive layer is sandwiched between the inner sides of two adjacent second refractive layers and are sandwiched between the outer sides by two third refractive layers, thereby collectively defining a bidirectional incremental module.

[0015] Preferably, among the N positive film layers, a second refractive layer away from the two-way progressive module is sandwiched between two third refractive layers, thereby collectively defining a two-way progressive sub-module.

[0016] Preferably, among the N positive film layers, a first refractive layer is disposed between the bidirectional increasing module and the first positive film layer, and the bidirectional increasing sub-module is connected to the Nth positive film layer.

[0017] Preferably, among the M back-facing film layers, two adjacent second refractive layers are sandwiched between a first refractive layer on their inner sides and two third refractive layers on their outer sides, thereby collectively defining a bidirectional incremental module.

[0018] Preferably, the thickness of the bidirectional increasing modules of the M rear film layers is 90% to 110% of the thickness of the bidirectional increasing modules of the N front film layers.

[0019] Preferably, the distance between the bidirectional increasing modules of the M rear-facing film layers and the second panel surface is 90% to 110% of the distance between the bidirectional increasing modules of the N front-facing film layers and the first panel surface.

[0020] Preferably, among the M back-facing film layers, a second refractive layer away from the substrate is sandwiched between a first refractive layer and a third refractive layer, thereby collectively defining a one-way incremental module.

[0021] Preferably, M back-facing film layers are connected to the second board surface with a first refractive layer and are defined as a first back-facing film layer, and M back-facing film layers are also configured with a first refractive layer at the end away from the second board surface and are defined as an Mth back-facing film layer; among the M back-facing film layers, a first refractive layer and a third refractive layer are configured between the bidirectional increasing module and the first back-facing film layer, and the unidirectional increasing module is connected to the Mth back-facing film layer.

[0022] Preferably, another bidirectional increasing module is configured between the M back-facing film layers and the unidirectional increasing module, which is defined by two adjacent second refractive layers sandwiching a first refractive layer on the inner side and two third refractive layers on the outer side.

[0023] Preferably, the refractive index of the bonding layer is between 1.35 and 1.42, the first refractive index is between 1.45 and 1.52, the second refractive index is between 1.62 and 1.71, and the third refractive index is between 2.2 and 2.8.

[0024] Preferably, the difference between N and M is not greater than 5, and N and M are each further defined as being between 10 and 30, and the number of the plurality of second refractive layers is defined as only eight.

[0025] In summary, the optical filter disclosed in the embodiment of the present invention is formed differently from the conventional bidirectional increasing module, and the refractive index of the bidirectional increasing module can be gradually increased from its first refractive layer toward two opposite directions, so as to adjust the overall refractive index distribution of the matching composite layer, thereby helping the optical filter to be designed to meet more diverse different needs.

[0026] Furthermore, the optical filter disclosed in the embodiment of the present invention can also be formed with the unidirectional incremental module to facilitate adjustment of the overall refractive index distribution of the matching composite layer, thereby facilitating the optical filter to be designed to meet more diverse requirements.

[0027] To further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, such description and drawings are only used to illustrate the present invention and are not intended to limit the protection scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 FIG. 1 is a schematic plan view of an optical filter according to a first embodiment of the present invention.

[0029] Figure 2 for Figure 1 Specific configuration diagram.

[0030] Figure 3It is a schematic plan view of an optical filter according to the second embodiment of the present invention.

[0031] Figure 4 for Figure 3 Specific configuration diagram.

[0032] Figure 5 It is a plan view schematic diagram of an optical filter according to the third embodiment of the present invention.

[0033] Figure 6 for Figure 5 Specific configuration diagram.

[0034] Figure 7 for Figure 5 Schematic diagram of simulation test of optical filter at different angles. DETAILED DESCRIPTION

[0035] The following is an explanation of the implementation of the "optical filter" disclosed in the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only simple schematic illustrations and are not depicted according to actual dimensions. It is stated in advance. The following implementations will further explain the relevant technical contents of the present invention in detail, but the disclosed contents are not intended to limit the scope of protection of the present invention.

[0036] It should be understood that, although the terms "first", "second", "third", etc. may be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are mainly used to distinguish one component from another component, or one signal from another signal. In addition, the term "or" used herein may include any one or more combinations of the associated listed items depending on the actual situation.

[0037] [Example 1]

[0038] See also Figure 1 and Figure 2 As shown, it is the first embodiment of the present invention. This embodiment discloses an optical filter 1000, which is preferably in a flat sheet structure. The optical filter 1000 in this embodiment can be applied to visible light (eg, 420 nanometers to 680 nanometers).

[0039] 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, and the matching composite layer 100 is bonded to the substrate 200 through the bonding layer 300, but the present invention is not limited thereto.

[0040] 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, and the side edges of the N film layers 10 are aligned with each other, and are preferably further aligned with the side edges of the bonding layer 300. Furthermore, N is a positive integer (e.g., N can be limited to between 30 and 50), and N is described as 37 in this embodiment (that is, the plurality of film layers 10 and the bonding layer 300 are described as a total of 38 layers in this embodiment), but the present invention is not limited thereto.

[0041] Further, the N film layers 10 can be divided 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 according to the refractive index. 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.

[0042] In addition, to facilitate understanding of the overall configuration of the matching composite layer 100, the plurality of film layers 10 may also be described by their stacking order; that is, the matching composite layer 100 is connected to the bonding layer 300 with a third refractive layer 10-3 and is defined as a first film layer 1; and the matching composite layer 100 is configured with the first refractive layer 10-1 at the end away from the bonding layer 300 and is defined as an Nth film layer N.

[0043] In this embodiment, the refractive index of the bonding layer 300 is less than 1.42 (e.g., between 1.35 and 1.42), the first refractive index may be between 1.45 and 1.52, the second refractive index may be between 1.62 and 1.71, and the third refractive index may be between 2.2 and 2.8. In other words, the optical filter 1000 in this embodiment uses four optical layers with different refractive indices for stacking, thereby providing a more diverse optical configuration and structure.

[0044] It should be additionally explained that, for the sake of understanding 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 a feasible 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.

[0045] Furthermore, the number of the plurality of second refractive layers 10-2 is less than the number of the plurality of first refractive layers 10-1, and is also less than the number of the plurality of third refractive layers 10-3. In this embodiment, the number of the plurality of second refractive layers 10-2 is limited to only three, and the three second refractive layers 10-2 are used to match part of the first refractive layer 10-1 and part of the third refractive layer 10-3, so as to respectively form a bidirectional increasing module 10a and a unidirectional increasing module 10b, but the present invention is not limited thereto. For example, in other embodiments not shown in the present invention, the number of the second refractive layers 10-2 can be adjusted to two or more than four according to design requirements; or, the matching composite layer 100 can be configured with only the bidirectional increasing module 10a, and the unidirectional increasing module 10b can be omitted.

[0046] In this embodiment, two adjacent second refractive layers 10-2 are sandwiched between one first refractive layer 10-1 on the inner side and two third refractive layers 10-3 on the outer side, thereby defining the two-way increasing module 10a. In other words, in the two-way increasing module 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, so that its refractive index can present a distribution of gradually increasing.

[0047] As described above, the optical filter 1000 formed in this embodiment is different from the conventional bidirectional increasing module 10a, and the refractive index of the bidirectional increasing module 10a can be gradually increased from its first refractive layer 10-1 toward two opposite directions, so as to adjust the overall refractive index distribution of the matching composite layer 100, thereby helping the optical filter 1000 to be designed to meet more diverse different needs.

[0048] Furthermore, the position of the one-way increasing module 10b in this embodiment is preferably far away from the position of the two-way increasing module 10a. Specifically, a second refractive layer 10-2 far away from the two-way increasing module 10a is sandwiched between a first refractive layer 10-1 and a third refractive layer 10-3, and thus is collectively defined as the one-way increasing module 10b, so that its refractive index can present a distribution of gradually increasing.

[0049] Accordingly, the optical filter 1000 in this embodiment may further be formed with the unidirectional increasing module 10b, so that the structure and configuration of the bidirectional increasing module 10a and the unidirectional increasing module 10b can be matched (such as: the unidirectional increasing module 10b and the bidirectional increasing module 10a are respectively located at opposite ends of the matching composite layer 100) to facilitate adjustment of the overall refractive index distribution of the matching composite layer 100, thereby helping the optical filter 1000 to be designed to meet more diverse different needs.

[0050] It should be additionally explained that, except for the unidirectional increasing module 10b and the bidirectional increasing module 10a, the remaining film layers 10 of the matching composite layer 100 are configured such that the first refractive layers 10-1 and the third refractive layers 10-3 are stacked alternately with each other (that is, any one of the first refractive layers 10-1 is sandwiched between two adjacent third refractive layers 10-3).

[0051] Furthermore, in order for the optical filter 1000 disclosed in this embodiment to have a smaller average reflectivity when it is rotated to a 30-degree offset from the vertically incident light source, the bidirectional increasing module 10a and the unidirectional increasing module 10b preferably meet at least part of the following configuration conditions, but are not limited thereto.

[0052] The bidirectional increasing module 10a is located adjacent to the first film layer 1, while the unidirectional increasing module 10b is adjacent to the Nth film layer N. Furthermore, the number and thickness of the film layers 10 disposed between the bidirectional increasing module 10a and the first film layer 1 are preferably different from the number and thickness of the film layers 10 disposed between the unidirectional increasing module 10b and the Nth film layer N.

[0053] Specifically, a first refractive layer 10-1 (e.g., the second film layer 2) is disposed between the bidirectional increasing module 10a and the first film layer 1, and the unidirectional increasing module 10b (with its third refractive layer 10-3) is connected to the Nth film layer N. In other words, the bidirectional increasing module 10a in this embodiment is the third film layer 3 to the seventh film layer 7, and the unidirectional increasing module 10b is the N-3th film layer N-3 to the N-1th film layer N-1.

[0054] Furthermore, in this embodiment, the thickness T10a of the bidirectional increasing module 10a is 165% to 180% of the thickness T10b of the unidirectional increasing module 10b, and the thickness T10-2a of any one of the second refractive layers 10-2 of the bidirectional increasing module 10a is greater than the thickness T10-2b of the second refractive layer 10-2 of the unidirectional increasing module 10b.

[0055] In more detail, the combination layer 300 and the matching composite layer 100 of the optical filter 1000 are formed by Figure 3 The specific configuration shown, after conducting corresponding simulation experimental results, can have an average reflectivity of less than 1% when facing a vertically incident light source (such as visible light) and being rotated to an incidence angle of 30 degrees.

[0056] [Example 2]

[0057] See also Figure 3 and Figure 4 As shown, this is the second embodiment of the present invention. Since this embodiment is similar to the above-mentioned first embodiment, the similarities between the two embodiments will not be described in detail, and the differences between this embodiment and the above-mentioned first embodiment are roughly described as follows:

[0058] In this embodiment, N is further limited to be between 30 and 50, and the number of the second refractive layer 10-2 is limited to only one. The single second refractive layer 10-2 is sandwiched between one first refractive layer 10-1 and one third refractive layer 10-3, and is further defined as the one-way increasing module 10b. That is, the number of the plurality of film layers 10 used in the optical filter 1000 in this embodiment can be the same as that in the first embodiment, but the optical filter 1000 in this embodiment is not configured with the two-way increasing module 10a (such as: Figure 1 ).

[0059] It should be additionally explained that, except for the one-way incremental module 10b, the remaining film layers 10 of the matching composite layer 100 are configured such that the first refractive layers 10-1 and the third refractive layers 10-3 are stacked alternately with each other (that is, any one of the first refractive layers 10-1 is sandwiched between two adjacent third refractive layers 10-3).

[0060] In more detail, the combination layer 300 and the matching composite layer 100 of the optical filter 1000 are formed by Figure 4 The specific configuration shown, after conducting corresponding simulation experimental results, can have an average reflectivity of less than 2% when facing a vertically incident light source (such as visible light) and being rotated to an incidence angle of 30 degrees.

[0061] Accordingly, the optical filter 1000 in this embodiment is formed with the unidirectional increasing module 10b, and the structure and configuration of the unidirectional increasing module 10b can be combined to facilitate adjusting the overall refractive index distribution of the matching composite layer 100, thereby helping the optical filter 1000 to be designed to meet more diverse different needs.

[0062] [Example 3]

[0063] See also Figures 5 to 7 As shown, it is the third embodiment of the present invention. Since this embodiment is similar to the above-mentioned first embodiment, the similarities between the two embodiments will not be repeated, and the differences between this embodiment and the above-mentioned first embodiment are roughly described as follows:

[0064] In this embodiment, the substrate 200 has a first surface 201 and a second surface 202 located on opposite sides thereof, and the bonding layer 300 is formed on the first surface 201 of the substrate 200, and the matching composite layer 100 is formed on the bonding layer 300 and the second surface 202 of the substrate 200. The matching composite layer 100 has a plurality of film layers 10, including 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, and the first refractive layers 10-1, the second refractive layers 10-2, and the third refractive layers 10-3 are substantially the same as those in the first embodiment, and are not described in detail herein.

[0065] Furthermore, the plurality of film layers 10 in this embodiment can be divided into N front film layers 10F sequentially stacked on the bonding layer 300, and M back film layers 10B sequentially stacked on the second plate surface 202. Wherein, N and M are both positive integers, the difference between N and M is preferably not greater than 5, and N and M are further defined as being between 10 and 30; and in this embodiment, N is equal to M and each is 22, but the present invention is not limited thereto.

[0066] To facilitate understanding of the overall configuration of the matching composite layer 100, the N forward film layers 10F and the M back film layers 10B can also be described by stacking order. That is, the N forward film layers 10F are connected to the bonding layer 300 with one third refractive layer 10-3, and are defined as a first forward film layer F1. The N forward film layers 10F are configured with one first refractive layer 10-1 at the end away from the bonding layer 300, and are defined as an Nth forward film layer FN. Furthermore, the M back film layers 10B are connected to the second board surface 202 with one first refractive layer 10-1, and are defined as a first back film layer B1, and the M back film layers 10B are configured with another first refractive layer 10-1 at the end away from the second board surface 202, and are defined as an Mth back film layer BM.

[0067] In this embodiment, the number of the plurality of second refractive layers 10-2 is limited to only eight, and three of the second refractive layers 10-2 are arranged in the N forward film layers 10F and are used to match part of the first refractive layer 10-1 and part of the third refractive layer 10-3, thereby respectively constituting a two-way incremental module 10a and a two-way incremental sub-module 10c; and the other five of the second refractive layers 10-2 are arranged in the M rear film layers 10B and are used to match part of the first refractive layer 10-1 and part of the third refractive layer 10-3, thereby respectively constituting two two-way incremental modules 10a and a unidirectional incremental module 10b, but the present invention is not limited thereto.

[0068] For example, in other embodiments not shown in the present invention, the number of the second refractive layers 10-2 can be adjusted to more than two according to design requirements; or, the bidirectional increasing sub-module 10c can be omitted among the N positive film layers 10F, and at least one of the bidirectional increasing modules 10a and / or the unidirectional increasing module 10b can be omitted among the M back film layers 10B according to design requirements.

[0069] Among the N positive film layers 10F, two adjacent second refractive layers 10-2 are sandwiched by a first refractive layer 10-1 on the inner side and sandwiched by two third refractive layers 10-3 on the outer side, thereby collectively defining the bidirectional incremental module 10a. Furthermore, among the N positive film layers 10F, a second refractive layer 10-2 far from the bidirectional incremental module 10a is sandwiched by two third refractive layers 10-3, thereby collectively defining the bidirectional incremental sub-module 10c.

[0070] Specifically, among the N positive film layers 10F, a first refractive layer 10-1 is disposed between the two-way increasing module 10a and the first positive film layer F1, and the two-way increasing sub-module 10c is connected to the Nth positive film layer FN. In other words, the two-way increasing module 10a and the two-way increasing sub-module 10c are respectively located at opposite ends of the corresponding N positive film layers 10F.

[0071] Among the M back-facing film layers 10B, two adjacent second refractive layers 10-2 are sandwiched between one first refractive layer 10-1 on the inner side and two third refractive layers 10-3 on the outer side, thereby collectively defining a bidirectional incremental module 10a. Furthermore, among the M back-facing film layers 10B, one second refractive layer 10-2 away from the substrate 200 is sandwiched between one first refractive layer 10-1 and one third refractive layer 10-3, thereby collectively defining a unidirectional incremental module 10b.

[0072] Specifically, among the M back-facing film layers 10B, one of the two-way increasing modules 10a and the first back-facing film layer B1 is provided with one of the first refractive layer 10-1 and one of the third refractive layer 10-3, and the one-way increasing module 10b is connected to the Mth back-facing film layer BM. In other words, one of the two-way increasing modules 10a and the one-way increasing module 10b are respectively located at the opposite ends of the corresponding M back-facing film layers 10B, and another two-way increasing module 10a is provided between the two, which is also defined by the first refractive layer 10-1 being sandwiched between the inner sides of two adjacent second refractive layers 10-2 and being sandwiched between two third refractive layers 10-3 on the outer sides.

[0073] In addition, among the M back-facing film layers 10B, only one first refractive layer 10 - 1 may be sandwiched between two of the two-way increasing modules 10 a , so as to enhance the mutual coordination effect between the two two-way increasing modules 10 a .

[0074] From another perspective, the thickness of each of the two-way increasing modules 10a of the M back film layers 10B is 90% to 110% of the thickness of the two-way increasing modules 10a of the N front film layers 10F. Furthermore, the distance between the two-way increasing modules 10a adjacent to the substrate 200 and the second board surface 202 among the M back film layers 10B is 90% to 110% of the distance between the two-way increasing modules 10a of the N front film layers 10F and the first board surface 201.

[0075] It should be additionally explained that, except for the bidirectional increasing module 10a, the unidirectional increasing module 10b, and the bidirectional increasing sub-module 10c, the remaining film layers 10 of the matching composite layer 100 are configured such that the first refractive layers 10-1 and the third refractive layers 10-3 are stacked alternately with each other (for example, any one of the first refractive layers 10-1 is sandwiched between two adjacent third refractive layers 10-3).

[0076] As described above, in the present embodiment, the optical filter 1000 configures the matching composite layer 100 on opposite sides of the substrate 200, respectively, so as to adjust the overall refractive index distribution of the matching composite layer 100 through the use of the bidirectional increasing module 10a, the unidirectional increasing module 10b, and the bidirectional increasing sub-module 10c, thereby facilitating the design of the optical filter 1000 to meet more diverse needs.

[0077] Furthermore, if Figure 7 As shown, curve A1 and curve B1 are the simulation test results of the optical filter 1000 of this embodiment at different angles, while curve A2 and curve B2 are the simulation test results of the existing optical filter at different angles which only has multiple refractive layers stacked in one direction of the plate and does not use the bidirectional increasing module 10a, the unidirectional increasing module 10b, and the bidirectional increasing sub-module 10c.

[0078] It can be seen that the optical filter 1000 of this embodiment can reduce the reflection by about 2.8% and effectively reduce ripples within the range of 435 nanometers (nm) to 630 nanometers, and the low reflection range is also widened by about 70 nanometers. In other words, when the overall spectrum falls within the range of 435 nanometers to 630 nanometers, the optical filter 1000 of this embodiment will have a better effect than the existing optical filter, and can even expand the applicable spectrum range to 400 nanometers to 700 nanometers.

[0079] [Technical Effects of Embodiments of the Invention]

[0080] In summary, the optical filter disclosed in the embodiment of the present invention is formed differently from the conventional bidirectional increasing module, and the refractive index of the bidirectional increasing module can be gradually increased from its first refractive layer toward two opposite directions, so as to adjust the overall refractive index distribution of the matching composite layer, thereby helping the optical filter to be designed to meet more diverse different needs.

[0081] Furthermore, the optical filter disclosed in the embodiment of the present invention can also be formed with the unidirectional incremental module to facilitate adjustment of the overall refractive index distribution of the matching composite layer, thereby facilitating the optical filter to be designed to meet more diverse requirements.

[0082] In addition, the optical filter disclosed in the embodiment of the present invention can also be formed with the bidirectional increasing module and the unidirectional increasing module, so that the structure and configuration of the bidirectional increasing module and the unidirectional increasing module can be matched (such as: the unidirectional increasing module and the bidirectional increasing module are respectively located at opposite ends of the matching composite layer) to facilitate adjustment of the overall refractive index distribution of the matching composite layer, thereby helping the optical filter to be designed to meet more diverse different needs.

[0083] The contents disclosed above are only preferred feasible embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention's specification and drawings are included in the patent scope of the present invention.

Claims

1. An optical filter, characterized in that: The optical filter comprises: a substrate; a bonding layer formed on the substrate, wherein the refractive index of the bonding layer is less than 1.42; and a matching composite layer formed on the combining layer, and the matching composite layer has N film layers stacked in sequence, where N is a positive integer; wherein the N film layers include: a plurality of first refractive layers, each having a first refractive index, the first refractive index being greater than the refractive index of the combining layer; a plurality of second refractive layers, each having a second refractive index greater than the first refractive index; wherein the number of the plurality of second refractive layers is less than the number of the plurality of first refractive layers; and A plurality of third refractive layers, each having a third refractive index greater than the second refractive index; wherein the number of the plurality of second refractive layers is less than the number of the plurality of third refractive layers; The matching composite layer is connected to the combining layer with the third refractive layer and is defined as a first film layer; the matching composite layer is configured with the first refractive layer at the end away from the combining layer and is defined as an Nth film layer; Wherein, two adjacent second refraction layers have one first refraction layer sandwiched between their inner sides, and two adjacent second refraction layers are sandwiched between their outer sides by two third refraction layers, thereby jointly defining a bidirectional incremental module.

2. The optical filter according to claim 1, characterized in that A second refractive layer far away from the bidirectional increasing module is sandwiched between a first refractive layer and a third refractive layer, thereby collectively defining a unidirectional increasing module.

3. The optical filter according to claim 2, characterized in that A first refractive layer is arranged between the bidirectional increasing module and the first film layer, and the unidirectional increasing module is connected to the Nth film layer.

4. The optical filter according to claim 2, characterized in that The bidirectional increasing module is located adjacent to the first film layer, and the unidirectional increasing module is located adjacent to the Nth film layer.

5. The optical filter according to claim 4, characterized in that The number and thickness of the film layers arranged between the bidirectional increasing module and the first film layer are different from the number and thickness of the film layers arranged between the unidirectional increasing module and the Nth film layer.

6. The optical filter according to claim 2, characterized in that The thickness of the bidirectional increasing module is 165% to 180% of the thickness of the unidirectional increasing module, and the thickness of any one of the second refractive layers of the bidirectional increasing module is greater than the thickness of the second refractive layer of the unidirectional increasing module.

7. The optical filter according to claim 1, characterized in that The refractive index of the bonding layer is between 1.35 and 1.42, the first refractive index is between 1.45 and 1.52, the second refractive index is between 1.62 and 1.71, and the third refractive index is between 2.2 and 2.

8.

8. The optical filter according to claim 1, characterized in that N is further defined as being between 30 and 50, and the number of the plurality of said second refractive layers is defined as only three.

9. An optical filter, characterized in that: The optical filter comprises: a substrate; a bonding layer formed on the substrate, wherein the refractive index of the bonding layer is less than 1.42; and a matching composite layer formed on the combining layer, and the matching composite layer has N film layers stacked in sequence, where N is a positive integer; wherein the N film layers include: a plurality of first refractive layers, each having a first refractive index, the first refractive index being greater than the refractive index of the combining layer; a second refractive layer 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 connected to the combining layer with the third refractive layer and is defined as a first film layer; the matching composite layer is configured with the first refractive layer at the end away from the combining layer and is defined as an Nth film layer; The second refractive layer is sandwiched between one of the first refractive layer and one of the third refractive layer, and thus they are collectively defined as a one-way incremental module.

10. The optical filter according to claim 9, characterized in that N is further defined as being between 30 and 50, and the number of the second refractive layer is defined as only a single one.

11. An optical filter, characterized in that: The optical filter comprises: A substrate having a first surface and a second surface located on opposite sides of the substrate; a bonding layer formed on the first surface of the substrate, wherein the bonding layer has a refractive index less than 1.42; and A matching composite layer is formed on the bonding layer and the second surface of the substrate, and the matching composite layer has a plurality of film layers, and the plurality of film layers include: A plurality of first refractive layers, each having a first refractive index, wherein the first refractive index is greater than the refractive index of the combining layer; a plurality of second refractive layers, each having a second refractive index greater than the first refractive index; wherein the number of the plurality of second refractive layers is less than the number of the plurality of first refractive layers; and A plurality of third refractive layers, each having a third refractive index greater than the second refractive index; wherein the number of the plurality of second refractive layers is less than the number of the plurality of third refractive layers; The plurality of film layers include N positive film layers sequentially stacked on the bonding layer and M negative film layers sequentially stacked on the second plate surface, where N and M are both positive integers; the N positive film layers are connected to the bonding layer with one third refractive layer, and are defined as a first positive film layer; the N positive film layers are configured with one first refractive layer at the end away from the bonding layer, and are defined as an Nth positive film layer; Among the N positive film layers, two adjacent second refractive layers are sandwiched by one first refractive layer on their inner sides, and two adjacent second refractive layers are sandwiched by two third refractive layers on their outer sides, thereby collectively defining a bidirectional incremental module.

12. The optical filter according to claim 11, characterized in that Among the N positive film layers, a second refractive layer far away from the two-way increasing module is sandwiched between two third refractive layers, and thus collectively defined as a two-way increasing sub-module.

13. The optical filter according to claim 12, characterized in that Among the N positive film layers, a first refractive layer is disposed between the bidirectional increasing module and the first positive film layer, and the bidirectional increasing sub-module is connected to the Nth positive film layer.

14. The optical filter according to claim 11, characterized in that Among the M back-facing film layers, two adjacent second refractive layers are sandwiched between one first refractive layer on their inner sides and are sandwiched between two third refractive layers on their outer sides, thereby collectively defining a bidirectional incremental module.

15. The optical filter according to claim 14, characterized in that The thickness of the bidirectional increasing modules of the M rear film layers is 90% to 110% of the thickness of the bidirectional increasing modules of the N front film layers.

16. The optical filter according to claim 14, characterized in that The distance between the bidirectional increasing modules of the M rear-facing film layers and the second plate surface is 90% to 110% of the distance between the bidirectional increasing modules of the N front-facing film layers and the first plate surface.

17. The optical filter according to claim 14, characterized in that Among the M back-facing film layers, a second refractive layer away from the substrate is sandwiched between a first refractive layer and a third refractive layer, thereby collectively defining a one-way incremental module.

18. The optical filter according to claim 17, characterized in that The M back-facing film layers are connected to the second board surface with one of the first refractive layers and are defined as a first back-facing film layer, and the M back-facing film layers are also configured with one of the first refractive layers at the end away from the second board surface and are defined as an Mth back-facing film layer; among the M back-facing film layers, a first refractive layer and a third refractive layer are configured between the two-way increasing module and the first back-facing film layer, and the unidirectional increasing module is connected to the Mth back-facing film layer.

19. The optical filter according to claim 17, characterized in that Another bidirectional increasing module is configured between the M back-facing film layers and the unidirectional increasing module. The bidirectional increasing module is defined by two adjacent second refractive layers having a first refractive layer sandwiched on the inner side and two third refractive layers sandwiched on the outer side.

20. The optical filter according to claim 11, characterized in that The refractive index of the bonding layer is between 1.35 and 1.42, the first refractive index is between 1.45 and 1.52, the second refractive index is between 1.62 and 1.71, and the third refractive index is between 2.2 and 2.

8.

21. The optical filter according to claim 11, characterized in that The difference between N and M is not greater than 5, and N and M are each further defined as being between 10 and 30, and the number of the plurality of second refractive layers is defined as only eight.

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