KR102486738B1 - High Heat Resistant Infrared Absorption Filter and Method for Manufacturing Thereof - Google Patents

Abstract

Disclosed are a high heat resistance infrared absorbing filter and a manufacturing method thereof.
According to one embodiment of the present invention, a mixing process of mixing a transparent polymer, a dye and a crosslinking agent absorbing light in the infrared wavelength band with a solvent, and a filtration process of filtering impurities in the mixture that has undergone the mixing process Characterized by including It provides a method for preparing an infrared absorbing polymer solution.

Description

High Heat Resistant Infrared Absorption Filter and Method for Manufacturing Thereof

The present invention relates to a high heat resistance infrared absorbing filter and a method for manufacturing the same.

The contents described in this part merely provide background information on the present embodiment and do not constitute prior art.

As images are taken, processed, and processed in various fields such as vehicles and vehicles, the processed images are used. Image sensors such as Complementary Metal Oxide Semiconductor are used.

An image sensor receives light and converts it into an electrical signal. The light sensitivity of such an image sensor is distributed not only in the visible light band but also in the infrared band and the ultraviolet band. Accordingly, the image sensor responds sensitively to infrared rays or ultraviolet rays as well as visible light. If the light incident on the image sensor is not separately processed, the color of the processed image sensed by the image sensor by infrared rays is changed, making it difficult to smoothly recognize the image.

Accordingly, a filter absorbing infrared rays or ultraviolet rays is disposed at a front end of the image sensor (in a direction in which light is incident). As the infrared absorption filter absorbs infrared rays or ultraviolet rays at the front end of the image sensor, only visible light may be incident to the image sensor.

A conventional infrared absorbing filter includes a polymer film or polymer layer in which infrared or ultraviolet absorbing particles are dispersed, and absorbs infrared or ultraviolet rays using the film or layer. Such a polymer film or polymer layer is shown in FIG. 12 .

12 is a view showing an infrared absorbing polymer film and an infrared absorbing polymer film in an infrared absorbing filter manufactured by a conventional manufacturing method.

As shown in FIG. 12 (a), infrared absorbing particles 1220 are dispersed and disposed in a polymer film or polymer layer 1210.

However, as shown in FIG. 12 (b), the corresponding film or layer in the conventional infrared absorbing filter is heated during an environmental test or an accelerated life test, and the dispersed infrared absorbing particles agglomerate with each other in the polymer ( Migration) is a phenomenon that occurs. As the infrared absorbing particles are aggregated in the film or layer during the manufacturing process, the infrared absorbing efficiency of the conventional infrared absorbing filter including the film or layer is lowered. Accordingly, the quality of a sensing image of an image sensor including a conventional infrared absorption filter is degraded.

An object of the present invention is to provide an infrared absorbing filter that improves infrared and ultraviolet absorbing efficiency by preventing aggregation of infrared absorbing dyes and a manufacturing method thereof.

According to one aspect of the present invention, a mixing process of mixing a transparent polymer, a dye and a crosslinking agent absorbing light in the infrared wavelength band with a solvent, and a filtration process of filtering impurities in the mixture that has undergone the mixing process Characterized in that it comprises A method for preparing an infrared absorbing polymer solution is provided.

According to one aspect of the present invention, the crosslinking agent is crosslinked by irradiation with radiation.

According to one aspect of the present invention, the radiation is characterized in that beta (β) rays.

According to one aspect of the present invention, a coating process of coating one surface of a transparent substrate with an infrared absorbing polymer solution prepared by any one of claims 1 to 3, an irradiation process of irradiating radiation with the infrared absorbing polymer solution, and the above A first coating process of coating an anti-reflection (AR) layer on an infrared absorbing polymer layer that has undergone an irradiation process, and an infrared reflective coating (IR: It provides a method for manufacturing an infrared filter, characterized in that it comprises a second coating process of coating the infrared-reflection) layer.

According to one aspect of the present invention, the transparent substrate is characterized in that it has a transmittance equal to or higher than a predetermined reference value for light in all wavelength bands.

According to one aspect of the present invention, an infrared filter manufactured by the above method is provided.

According to one aspect of the present invention, a mixing process of mixing a transparent polymer, a dye and a crosslinking agent absorbing light in an infrared wavelength band with a solvent, a filtration process of filtering impurities in a mixture that has undergone the mixing process, and a mixture that has undergone the filtration process It provides a method for manufacturing an infrared absorbing polymer film, characterized in that it comprises a casting process for casting in the form of a film.

According to one aspect of the present invention, the crosslinking agent is crosslinked by irradiation with radiation.

According to one aspect of the present invention, the radiation is characterized in that beta (β) rays.

According to one aspect of the present invention, the first coating process of coating an overcoating layer on both sides of the infrared absorbing polymer film prepared by the above method and the coating in the direction in which light first enters the infrared absorbing polymer film A second coating process of coating an anti-reflection (AR) layer on the overcoating layer and a third coating process of coating an infrared-reflection (IR) layer on the overcoating layer coated in the other direction, and It provides an infrared filter manufacturing method comprising an irradiation process of irradiating radiation with the infrared absorbing polymer film.

According to one aspect of the present invention, the overcoating layer improves the adhesion between the infrared absorbing polymer film and the antireflection coating layer or the infrared absorbing polymer film and the infrared reflective coating layer, or protects the infrared absorbing polymer film. .

According to one aspect of the present invention, the infrared ray absorbing polymer film is characterized in that it has transmittance equal to or higher than a predetermined reference value for light in all wavelength bands.

According to one aspect of the present invention, the irradiation process of irradiating radiation with the infrared absorbing polymer film prepared by the above method and the first coating process of coating an overcoating layer on both sides of the infrared absorbing polymer film, respectively, and light A second coating process of coating an anti-reflection (AR) layer on the overcoating layer coated in the first incident direction of the infrared absorbing polymer film and an infrared reflective coating (IR: Infrared-Reflection) provides a method for manufacturing an infrared filter, characterized in that it comprises a third coating process for coating the layer.

According to one aspect of the present invention, the overcoating layer improves the adhesion between the infrared absorbing polymer film and the antireflection coating layer or the infrared absorbing polymer film and the infrared reflective coating layer, or protects the infrared absorbing polymer film. .

According to one aspect of the present invention, the infrared ray absorbing polymer film is characterized in that it has transmittance equal to or higher than a predetermined reference value for light in all wavelength bands.

According to one aspect of the present invention, an infrared filter manufactured by the above method is provided.

As described above, according to one aspect of the present invention, there is an advantage in that the infrared and ultraviolet absorption efficiency of the infrared absorption filter can be improved by preventing the aggregation of the infrared absorption dye contained therein.

1 is a flowchart illustrating a method of manufacturing an infrared absorbing polymer film according to an embodiment of the present invention.
2 is a view showing an infrared absorbing polymer film according to an embodiment of the present invention.
3 is a flowchart illustrating a method of manufacturing an infrared absorbing filter according to a first embodiment of the present invention.
4 is a flowchart illustrating a method of manufacturing an infrared absorbing filter according to a second embodiment of the present invention.
5 is a view showing an infrared absorbing filter manufactured by a manufacturing method according to a first or second embodiment of the present invention.
6 is a view showing an infrared absorbing polymer film in an infrared absorbing filter manufactured by a manufacturing method according to a first or second embodiment of the present invention.
7 is a flowchart illustrating a method of preparing an infrared absorbing polymer solution according to an embodiment of the present invention.
8 is a flowchart illustrating a method of manufacturing an infrared absorption filter according to a third embodiment of the present invention.
9 is a view showing an infrared absorbing filter manufactured by a manufacturing method according to a third embodiment of the present invention.
10 is a view showing an infrared absorbing polymer film in an infrared absorbing filter manufactured by a manufacturing method according to a third embodiment of the present invention.
11 is a graph showing infrared and ultraviolet absorption rates of a conventional infrared absorption filter and an infrared absorption filter according to an embodiment of the present invention.
12 is a view showing an infrared absorbing polymer film and an infrared absorbing polymer film in an infrared absorbing filter manufactured by a conventional manufacturing method.

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention. Like reference numerals have been used for like elements throughout the description of each figure.

Terms such as first, second, A, and B may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention. The terms and/or include any combination of a plurality of related recited items or any of a plurality of related recited items.

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no intervening element exists.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. It should be understood that terms such as "include" or "having" in this application do not exclude in advance the possibility of existence or addition of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification. .

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs.

Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

In addition, each configuration, process, process or method included in each embodiment of the present invention may be shared within a range that does not contradict each other technically.

1 is a flowchart illustrating a method of manufacturing an infrared absorbing polymer film according to an embodiment of the present invention.

The infrared ray absorbing polymer film is included in a filter for absorbing infrared rays and ultraviolet rays, and absorbs infrared rays and ultraviolet rays above a predetermined level. For example, an infrared absorbing polymer film filters infrared and ultraviolet rays, such as an infrared absorption filter that filters infrared rays and ultraviolet rays or a band pass filter that filters out wavelengths other than a specific wavelength band (eg, 905 nm). It is included in various filters for

A filter including an infrared absorbing polymer film is mainly disposed in front of an image sensor (CCD or CMOS) for image processing (the infrared ray absorbing filter is based on the direction in which light is incident), and transmits infrared rays and ultraviolet rays incident to the image sensor. filter Infrared and ultraviolet rays are sensed together with visible light in an image sensor, and must be removed because they distort the quality of an image sensed by the image sensor. A filter containing an infrared absorbing polymer film is included in devices that directly capture images, such as smartphones or digital cameras, as well as devices that acquire images by being included in various devices such as mobile means such as autonomous vehicles or satellites. Such an infrared absorbing polymer film is manufactured by the following process.

A transparent polymer, a dye and a crosslinking agent are mixed with a solvent (S110).

The transparent polymer is a polymer having a light transmittance of light, in particular, a visible light wavelength band higher than a predetermined reference value, for example, COP (Cyclo-Olefin Polymer), COC (Cyclo-Olefin Copolymer), polymid or polycarbonate. (PC: Polycarbonate) and the like.

The dye is a component having a property of absorbing light in an infrared wavelength band, and is mixed with a transparent polymer and absorbs infrared rays irradiated to the film within the film. For example, the dye may be implemented with a diimmonium-based compound, squaraine dye, cyanine dye, or phthalocyanine dye.

The crosslinking agent causes a crosslinking reaction when irradiated with radiation, in particular, beta rays, thereby crosslinking between polymers in polymers or between polymers in polymers and dyes. A crosslinking agent is added, and by a crosslinking reaction caused by the crosslinking agent afterwards, the dye is fixed to the crosslinking network formed by the crosslinking agent and cannot migrate. The crosslinking agent may be included in an amount of about 1% relative to the amount of the transparent polymer and the dye.

The crosslinking agent is implemented as TAC, TAIC or TMPTMA, etc., and has strong heat resistance, causing a crosslinking reaction only to radiation and not reacting to other external stimuli such as heat. Accordingly, there is no need to provide a stimulus other than radiation to induce a crosslinking reaction of the crosslinking agent, so that the problem of changing the properties of the transparent polymer (polymers within the polymer) due to an external stimulus does not occur. Since the crosslinking agent causes a crosslinking reaction by radiation having strong energy, the reaction may occur even when irradiated for a short time (eg, several milliseconds (ms) to several seconds (s)). Accordingly, the production yield of an infrared absorbing polymer film, an infrared absorbing polymer solution or an infrared absorbing filter to be described later can be remarkably improved. In addition, radiation having strong energy (several to several tens of kGY) may cause a crosslinking reaction between the polymer and the crosslinking agent in the transparent polymer regardless of molecular bonds (eg, double bonds) between molecules in the transparent polymer or bonds between specific components. Therefore, there is no restriction on the type of transparent polymer included in the manufacture of an infrared absorbing polymer film or the like. That is, the transparent polymer only needs to be a polymer having a light transmittance in the visible light wavelength range equal to or greater than a predetermined reference value, and there are no restrictions such as having to include molecules having specific molecular bonds or having a bonding structure between specific components. Furthermore, since the crosslinking agent causes a crosslinking reaction by radiation, it can cause a crosslinking reaction between the transparent polymer and the dye as well as the transparent polymer.

Since the crosslinking agent causes a crosslinking reaction by radiation having strong energy, the crosslinking reaction occurs only by irradiation of radiation even if a separate additive such as an initiator is not included.

In addition to the transparent polymer, dye, and crosslinking agent, additional additives may be further included. For example, a dispersant may be added to increase the dispersity of the dye in the infrared absorbing polymer film to be prepared.

The transparent polymer, dye, crosslinking agent, and further additives are mixed together with the solvent.

Filter impurities in the mixed solution (S120).

Impurities may be included in the process of mixing the transparent polymer, dye, crosslinking agent, and additives with the solvent. Since these impurities deteriorate the performance of the infrared absorbing polymer film to be produced, they must be removed. Thus, the mixed solution undergoes an impurity filtering process.

The filtered solution is cast in the form of a film (S130).

The solution filtered from impurities is cast in the form of a film. The solution may be cast in the form of a film by coating the corresponding solution on a base film or substrate and then drying the solution. As this is cast, a polymer film that absorbs infrared and ultraviolet rays, including the dye, emits the light of the dye, and transmits light other than infrared and ultraviolet rays is cast. However, this process is not necessarily limited to casting the solution in the form of a film, and the solution may be cast in the form of a film through various processes.

An infrared absorbing polymer film prepared through the above process is shown in FIG. 2 .

2 is a view showing an infrared absorbing polymer film according to an embodiment of the present invention.

The infrared absorbing polymer film 200 includes a dye 220 and a crosslinking agent 230 evenly dispersed in the transparent polymer 210 cast in the form of a film. As such, since the infrared absorbing polymer film 200 includes the crosslinking agent 230 as well as the dye 220 in the film, it is possible to prevent the dye 220 from aggregating during the manufacturing process of the filter including the film 200. there is.

3 is a flow chart showing a method of manufacturing an infrared absorption filter according to a first embodiment of the present invention, and FIG. 5 is an infrared absorption filter manufactured by a manufacturing method according to a first or second embodiment of the present invention. It is an illustrated drawing.

An overcoat layer is coated on both sides of the infrared absorbing polymer film 200 (S310). Overcoating layers 510a and 510b are coated on both surfaces of the infrared absorbing polymer film 200 in a direction in which light is irradiated. The overcoating layers 510a and 510b are directly coated on the infrared absorbing polymer film 200, (thermally) protect the infrared absorbing polymer film 200 in a subsequent process to improve (thermal) reliability, and antireflection to be coated later. Adhesion between the coating 520, the infrared reflective coating 530, and the infrared absorbing polymer film 200 is improved. In addition, the overcoating layer has a transmittance higher than a certain standard value for light in all wavelength bands, and transmits most of any light without absorption or reflection.

An anti-reflection coating layer 520 is coated on the overcoating layer 510a in the direction in which light first enters (S320).

In order to prevent light incident on the filter from being reflected without being incident on the filter, an anti-reflection coating layer (AR) is placed on the overcoating layer 510a in the direction in which the light first enters based on the infrared absorbing polymer film 200. , 520) is coated. The anti-reflection coating layer 520 first contacts light in the infrared absorption filter 500 and allows light to enter the filter while minimizing reflection.

An infrared reflective coating layer 530 is coated on the remaining overcoating layer 510b (S330).

A significant portion of infrared rays and ultraviolet rays are absorbed in the infrared absorbing polymer film 200, but there may be infrared rays and ultraviolet rays that pass through some of the film. In order to prevent the remaining infrared rays from passing through the filter, the infrared rays are placed on the overcoating layer 510b. A reflection coating layer (IR: Infrared-Reflection, 530) is coated. Infrared rays or ultraviolet rays transmitted through the infrared absorbing polymer film 200 are reflected by the infrared reflective coating layer 530 and proceed to the infrared absorbing polymer film 200 again, and are absorbed by the infrared absorbing polymer film 200 . Accordingly, the infrared or ultraviolet absorption rate of the infrared absorption filter 500 is improved by the infrared reflective coating layer 530 . In addition, the coating of the anti-reflection coating layer 520 is performed at a high temperature. When the infrared reflective coating layer 530 does not exist on the opposite side of the anti-reflection coating layer 520 based on the infrared absorbing polymer film 200, the infrared absorption is absorbed by the high temperature. A problem in which the polymer film 200 is bent occurs. To prevent this problem, an infrared reflective coating layer 530 is coated on the overcoating layer 510b.

Radiation is irradiated to the infrared absorbing polymer film 200 (S340). Since the anti-reflection coating layer 520 is a layer that prevents most of the light from being reflected, it does not affect the propagation of radiation. Since the overcoating layers 510a and 510b transmit light in all wavelength bands, they also do not affect the propagation of radiation. In addition, since the infrared reflective coating layer 530 only reflects infrared rays or ultraviolet rays and transmits light in the rest of the wavelength band, the infrared reflective coating layer 530 also does not affect the propagation of radiation. Therefore, no matter which direction radiation is radiated from the infrared absorbing polymer film 200 coated with each of the layers 510 to 530, the radiation can be radiated to the infrared absorbing polymer film.

The crosslinking agent included in the film 200 causes a crosslinking reaction by radiation. Since radiation can transmit up to several cm, even after all of the coating layers 510 to 530 are coated on the infrared absorbing polymer film 200 to form a filter, the radiation penetrates each coating layer 510 to 530 to the film 200. this can be investigated. That is, the crosslinking reaction may occur by irradiation of radiation right after the infrared absorbing polymer film 200 is manufactured, or may occur after the filter including the infrared absorbing polymer film 200 is all manufactured.

Radiation is irradiated to the infrared absorbing polymer film 200, and the infrared absorbing polymer film 200 changes as shown in FIG.

6 is a view showing an infrared absorbing polymer film in an infrared absorbing filter manufactured by a manufacturing method according to a first or second embodiment of the present invention.

When the infrared absorbing polymer film 200 is irradiated with radiation, the crosslinking agent 610 in the film causes a crosslinking reaction. Accordingly, the polymers of the transparent polymer 210 or the polymers of the transparent polymer 210 and the dye 220 are crosslinked in the infrared absorbing polymer film 600 irradiated with radiation. As such, the dye 220 may be fixed while being dispersed within the film 600 by the cross-linking network formed by the cross-linking agent 610 .

When the overcoating layer 510 or each of the antireflection layers 520 and 530 is coated on the transparent polymer in the infrared absorbing polymer film 200 and heat is applied from the outside to the infrared absorbing polymer film 200, the dye 220 becomes a transparent polymer It is not fixed within the 210 and flows, and the dyes 220 stick together. When the dyes are agglomerated, the infrared absorbing polymer filter 500 has a problem in that the infrared absorption rate is significantly lowered. In addition, light passing through the infrared absorbing polymer film 200 is scattered and the transmittance of light incident to the film is reduced. This lowers the transmittance of visible light as well as infrared light passing through the film, which may affect the sensing result of the image sensor. The infrared absorbing polymer film 200 includes a crosslinking agent 230 therein so that the crosslinking agent 230 is irradiated with radiation to form a crosslinking network, thereby preventing the dye 220 from flowing and allowing it to be fixed in a dispersed state. .

In addition, the crosslinking agent 610 has relatively superior thermal reliability compared to the polymer 210 . The finally manufactured infrared absorbing polymer filter 500 must secure different thermal reliability depending on the application to be used. For example, when the infrared absorbing polymer filter 500 is applied to a smartphone, it should be able to maintain at a temperature of 85 to 120° C. for about 120 hours without any change in performance. As another example, when the infrared absorbing polymer filter 500 is used for image acquisition in a moving means such as a vehicle, it must be maintained at a temperature equal to or higher than the above-described temperature for a long time without performance change. As such, the infrared absorbing polymer filter 500 needs to secure thermal reliability so that performance change does not occur for a long time at a high temperature. Conventional infrared absorbing polymer filters have difficulties in securing such thermal reliability. However, the infrared absorbing polymer filter 500 not only includes the overcoating layers 520a and 520b, but also the infrared absorbing polymer film 600, which is essential for infrared absorption, further includes a crosslinking agent 610 having excellent thermal reliability. It is possible to secure higher thermal reliability than before.

4 is a flow chart showing a method for manufacturing an infrared absorption filter according to a second embodiment of the present invention, and FIG. 5 is an infrared absorption filter manufactured by a manufacturing method according to a first or second embodiment of the present invention. It is an illustrated drawing.

Radiation is irradiated to the infrared absorbing polymer film 200 (S410). First, radiation is irradiated to the infrared absorbing polymer film 200 manufactured by the method shown in FIG. 1 . When irradiated with radiation, the infrared absorbing polymer film 200 changes to the infrared absorbing polymer film 600 shown in FIG. 6 and has a fixed state in which the dye 210 is dispersed.

An overcoat layer is coated on both sides of the infrared absorbing polymer film 200 (S420).

An anti-reflection coating layer 520 is coated on the overcoating layer 510a in the direction in which light first enters (S430).

An infrared reflective coating layer 530 is coated on the remaining overcoating layer 510b (S440).

7 is a flowchart illustrating a method of preparing an infrared absorbing polymer solution according to an embodiment of the present invention. Manufacturing of the infrared absorbing polymer solution according to an embodiment of the present invention is similar to the manufacturing of the infrared absorbing polymer film 200 shown in FIG. 1, and goes through a mixing process (S710) and a filtering process (S720) as follows. However, since it is not manufactured in the form of a film, the casting process is not included.

A transparent polymer, a dye and a crosslinking agent are mixed with a solvent (S710).

Impurities in the mixed solution are filtered (S720).

8 is a flow chart showing a method for manufacturing an infrared absorption filter according to a third embodiment of the present invention, and FIG. 9 is a view showing an infrared absorption filter manufactured by a manufacturing method according to a third embodiment of the present invention. to be.

The transparent substrate 920 is coated with an infrared absorbing polymer solution (S810).

The transparent substrate 920 is a substrate that provides a space on which the infrared absorbing polymer solution can be coated, and means a substrate that transmits light including at least infrared rays and visible rays above a predetermined reference value. A representative example of the transparent substrate 920 is a glass substrate. The infrared absorbing polymer solution may be coated on the transparent substrate 920 by spin coating, but is not necessarily limited thereto, and slot die coating, dip coating, or spray coating. Coating), flow coating (Flow Coating), screen printing (Screen Printing) can be coated by various methods. By coating the infrared absorbing polymer solution, the infrared absorbing polymer layer 910 is formed on the transparent substrate 920 . By coating the infrared absorbing polymer solution on the transparent substrate 920 in the direction in which light is incident, the transparent substrate can perform the same operation as the infrared absorbing film.

Before the infrared absorbing polymer solution is coated on the transparent substrate 920, the base coating layer 930 is first coated on the transparent substrate 920 in the direction in which the light is irradiated, and then the infrared ray absorbing layer 930 is coated on the base coating layer 930. An absorbent polymer solution may be coated. Similar to the overcoating layer 510, the base coating layer 930 improves adhesion between the transparent substrate 920 and the infrared absorbing polymer solution.

Radiation is irradiated to the infrared absorbing polymer layer 910 (S820). Radiation is irradiated to the infrared absorbing polymer layer 910 coated on the transparent substrate 920, and the crosslinking agent in the film causes a crosslinking reaction. Accordingly, the dye in the infrared absorbing polymer layer 910 may be fixed in a dispersed state.

An antireflection coating layer 940 is coated on the infrared absorbing polymer layer 910 (S830). The reason why the anti-reflection coating layer 940 is coated is the same as the reason why the anti-reflection coating layer 520 is coated, so repeated description is omitted.

An infrared reflective coating layer 950 is coated on the remaining transparent substrate 920 not coated with the infrared absorbing polymer solution. The reason why the infrared reflective coating layer 950 is coated is also the same as the reason why the infrared reflective coating layer 530 is coated, so repeated description is omitted.

10 is a view showing an infrared absorbing polymer film in an infrared absorbing filter manufactured by a manufacturing method according to a third embodiment of the present invention.

Since the transparent polymer 1010 in the infrared absorbing polymer layer 910 is coated in a solution form on a transparent substrate, the width is inevitably narrower than that of the infrared absorbing polymer film 200 or 600 . The density of the dye 220 in the infrared absorbing polymer layer is relatively higher than that of the infrared absorbing polymer film. Accordingly, in the infrared absorbing filter prepared from the infrared absorbing polymer solution according to the conventional method, the degree of concentration of the dye becomes relatively severe. For this reason, the infrared absorption filter manufactured according to the conventional method has a very low infrared or ultraviolet absorption rate.

On the other hand, since the dye 220 is dispersed and fixed by the crosslinking agent 610, even if the width of the infrared absorbing polymer layer 1010 is narrow, the infrared absorbing filter 910 may have excellent infrared or ultraviolet absorbance.

In particular, the infrared absorption rate and the ultraviolet absorption rate of the infrared absorption filter are supported by FIG. 11 .

11 is a graph showing infrared and ultraviolet absorption rates of a conventional infrared absorption filter and an infrared absorption filter according to an embodiment of the present invention.

As shown in FIG. 11 (a), the ultraviolet transmittance of the conventional infrared absorption filter shows a value close to 40% in the ultraviolet region (380 nm or less), whereas, as shown in FIG. 11 (b), according to an embodiment of the present invention It can be seen that the UV transmittance of the infrared absorbing filter significantly drops to close to 20% after radiation is irradiated and the crosslinking agent forms a crosslinked network. That is, as the infrared absorbing film according to an embodiment of the present invention is prepared by including a crosslinking agent together with a polymer and a dye, it can be confirmed that the infrared absorbing filter including the film significantly improves the ultraviolet ray absorbency as well as the infrared ray absorbent. .

1, 3, 4, 7 and 8 describe that each process is sequentially executed, but this is merely an example of the technical idea of one embodiment of the present invention. In other words, those skilled in the art to which an embodiment of the present invention pertains may change and execute the order described in each drawing or perform one or more processes of each process without departing from the essential characteristics of an embodiment of the present invention. Since various modifications and variations can be applied by executing in parallel, FIGS. 1, 3, 4, 7, and 8 are not limited to a time-series order.

Meanwhile, the processes shown in FIGS. 1, 3, 4, 7 and 8 can be implemented as computer readable codes on a computer readable recording medium. A computer-readable recording medium includes all types of recording devices in which data that can be read by a computer system is stored. That is, computer-readable recording media include storage media such as magnetic storage media (eg, ROM, floppy disk, hard disk, etc.) and optical reading media (eg, CD-ROM, DVD, etc.). In addition, the computer-readable recording medium may be distributed to computer systems connected through a network to store and execute computer-readable codes in a distributed manner.

The above description is merely an example of the technical idea of the present embodiment, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present embodiment. Therefore, the present embodiments are not intended to limit the technical idea of the present embodiment, but to explain, and the scope of the technical idea of the present embodiment is not limited by these embodiments. The scope of protection of this embodiment should be construed according to the claims below, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of rights of this embodiment.

200, 600: infrared absorbing polymer film
210, 1010: transparent polymer
220: dye
230, 610: crosslinking agent
500, 900: infrared absorbing polymer filter
510, 940: overcoating layer
520, 950: anti-reflection coating layer
530: infrared reflective coating layer
910: infrared absorbing polymer layer
920: transparent substrate
930: base coating layer

Claims (16)

A mixing process of mixing a transparent polymer, a dye that absorbs light in an infrared wavelength band, and a crosslinking agent with a solvent; and
Including a filtration step of filtering impurities in the mixture that has undergone the mixing step,
The crosslinking agent causes a crosslinking reaction only with radiation, crosslinks between polymers in a polymer or crosslinks between a polymer and a dye,
The transparent polymer is implemented with any one of COP (Cyclo-Olefin Polymer), COC (Cyclo-Olefin Copolymer), polymid and polycarbonate (PC: Polycarbonate),
The dye is embodied by any one of a Diimmonium-based compound, a squaraine dye, a cyanine dye, and a phthalocyanien dye,
The crosslinking agent is embodied in only one of TAC, TAIC, or TMPTMA to cause a crosslinking reaction only with radiation, and is included by a predetermined error range at 1% compared to the amount of the transparent polymer and the dye. Infrared absorbing polymer solution, characterized in that manufacturing method. delete According to claim 1,
the radiation,
A method for producing an infrared absorbing polymer solution, characterized in that it is beta (β) ray. A first coating process of coating one surface of the transparent substrate with the infrared absorbing polymer solution prepared by any one of claims 1 and 3;
an irradiation process of irradiating radiation with the infrared absorbing polymer solution;
a second coating process of coating an anti-reflection (AR) layer on the infrared absorbing polymer layer that has undergone the irradiation process; and
A third coating process of coating an infrared-reflection (IR) layer on one surface of the remaining transparent substrate not coated with the infrared absorbing polymer solution.
Infrared filter manufacturing method comprising a. According to claim 4,
The transparent substrate,
A method for manufacturing an infrared filter, characterized in that it has a transmittance higher than a preset reference value for light in all wavelength bands. An infrared filter manufactured by the method of claim 4. A mixing process of mixing a transparent polymer, a dye that absorbs light in an infrared wavelength band, and a crosslinking agent with a solvent;
a filtration step of filtering impurities in the mixture that has undergone the mixing step; and
Including a casting process of casting the mixture that has undergone the filtration process in the form of a film,
The crosslinking agent causes a crosslinking reaction only with radiation, crosslinks between polymers in a polymer or crosslinks between a polymer and a dye,
The transparent polymer is implemented with any one of COP (Cyclo-Olefin Polymer), COC (Cyclo-Olefin Copolymer), polymid and polycarbonate (PC: Polycarbonate),
The dye is embodied by any one of a Diimmonium-based compound, a squaraine dye, a cyanine dye, and a phthalocyanien dye,
The crosslinking agent is implemented with only one of TAC, TAIC, or TMPTMA to cause a crosslinking reaction only with radiation, and is included by a predetermined error range at 1% compared to the amount of the transparent polymer and the dye. Infrared absorbing polymer film, characterized in that manufacturing method. delete According to claim 7,
the radiation,
A method for manufacturing an infrared absorbing polymer film, characterized in that beta (β) rays. A first coating process of coating an overcoating layer on both sides of the infrared absorbing polymer film prepared by any one of claims 7 and 9;
a second coating process of coating an anti-reflection (AR) layer on the overcoating layer coated in a direction in which light first enters the infrared absorbing polymer film;
A third coating process of coating an infrared-reflection (IR) layer on the overcoating layer coated in the other direction; and
Irradiation process of irradiating radiation with the infrared absorbing polymer film
Infrared filter manufacturing method comprising a. According to claim 10,
The overcoating layer,
The infrared filter manufacturing method, characterized in that to improve the adhesion between the infrared absorbing polymer film and the anti-reflection coating layer or the infrared absorbing polymer film and the infrared reflective coating layer or to protect the infrared absorbing polymer film. According to claim 10,
The infrared absorbing polymer film,
A method for manufacturing an infrared filter, characterized in that it has a transmittance higher than a preset reference value for light in all wavelength bands. An irradiation process of irradiating radiation with an infrared absorbing polymer film prepared by any one of claims 7 and 9;
A first coating process of coating an overcoating layer on both sides of the infrared absorbing polymer film, respectively;
a second coating process of coating an anti-reflection (AR) layer on the overcoating layer coated in a direction in which light first enters the infrared absorbing polymer film; and
The third coating process of coating an IR (Infrared-Reflection) layer on the overcoating layer coated in the other direction
Infrared filter manufacturing method comprising a. According to claim 13,
The overcoating layer,
The infrared filter manufacturing method, characterized in that to improve the adhesion between the infrared absorbing polymer film and the anti-reflection coating layer or the infrared absorbing polymer film and the infrared reflective coating layer or to protect the infrared absorbing polymer film. According to claim 13,
The infrared absorbing polymer film,
A method for manufacturing an infrared filter, characterized in that it has a transmittance higher than a preset reference value for light in all wavelength bands.

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