JPH09330612A - Near infrared ray absorbing panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight near infrared ray absorbing panel easy to machine and having a good color tone by sticking an absorbing layer dispersed with coloring matter having near infrared ray absorbing power in a transparent polymer resin and an electromagnetic wave shielding layer having a near infrared ray shielding effect and an electromagnetic wave shielding effect together. SOLUTION: An absorbing layer 1 dispersed with coloring matter having near infrared ray absorbing power in a transparent polymer resin and an electromagnetic wave shielding layer 2 having a near infrared ray shielding effect and/or an electromagnetic wave shielding effect are stuck together. A transparent polymer adhesive having high adhesive strength is preferably used. A board molded with coloring matter of nickel, aluminum, or diimonium having near infrared ray absorbing power and a polymer resin such as polymethyl methacrylate or copolymer polyester by fusion extrusion can be used for the absorbing layer 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a near-infrared absorbing panel that absorbs near-infrared rays generated from a video output device, a lighting fixture or the like and prevents malfunction of a remote controller operating in the near-infrared ray region. Further, the present invention relates to a near-infrared cut filter used for light-receiving sensitivity correction and color tone correction of a photodiode or a solid-state image sensor (CCD) camera used in a light-receiving element or an imaging element of an optical device.

[0002]

2. Description of the Related Art As a near-infrared ray absorbing panel, a filter formed by depositing a vapor deposition film on glass and a filter made of phosphate glass containing metal ions are known. However, the former uses interference, and therefore has problems such as obstacles to reflected light and inconsistency with luminosity, while the latter has problems such as hygroscopicity and complexity of manufacturing process. Further, the conventional glass filter has problems that it is heavy and easily broken, and it is difficult to perform processing such as bending. In order to solve these problems, many materials having characteristic absorption in the near infrared region have been proposed for the purpose of making filters plastic. For example, JP-A-6-2141
A panel in which a metal phthalocyanine compound is dissolved in a monomer of methyl methacrylate and then polymerized as described in 13 is known. Further, a near infrared absorption panel is also known in which a phthalocyanine-based compound, an anthraquinone-based compound, or a cyanine-based compound is kneaded in a molten resin and then extruded. However, these near-infrared absorbing panels all have poor color tone. If the color tone is bad,
For example, when used for a panel such as a color display,
There is a drawback that the image is difficult to see.

[0003]

DISCLOSURE OF THE INVENTION As a result of intensive studies made by the present inventors in view of the above-mentioned drawbacks of the prior art, as a result, an absorption layer in which a dye having near-infrared absorbing ability is dispersed in a transparent polymer resin is formed. We have found that a near-infrared absorbing panel, which has a structure in which an electromagnetic-wave shielding layer having a near-infrared shielding effect and / or an electromagnetic-wave shielding effect is laminated, can solve these drawbacks, and has conducted this research. It is a completed product, and its purpose is to be lightweight and easy to process,
Another object of the present invention is to provide a plastic near-infrared absorbing panel which has a good color tone and is suitable for a panel such as a color display.

[0004]

The above-mentioned object is to provide an absorption layer in which a dye having a near-infrared absorbing ability is dispersed in a transparent polymer resin and an electromagnetic wave having a near-infrared shielding effect and / or an electromagnetic shielding effect. This is achieved by a near-infrared absorbing panel having a structure in which a shielding layer is attached. That is, various dyes having near-infrared absorbing ability are blended according to the characteristics, and the near-infrared absorption range and the color tone in the visible light region can be adjusted according to the purpose, and the light-weight plastic near-infrared ray is easy to process. An absorption panel can be provided.

The present invention will be described in detail below.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The near infrared ray absorbing panel of the present invention comprises:
Characterized by having a structure in which an absorption layer in which a dye having a near-infrared absorbing ability is dispersed in a transparent polymer resin and an electromagnetic wave shielding layer having a near infrared ray shielding effect and / or an electromagnetic wave shielding effect are attached. It is a near infrared absorption panel.

The absorption layer in which a dye having a near-infrared absorbing ability is dispersed in a transparent polymer resin of the near-infrared absorbing panel of the present invention is a nickel-based, aluminum-based, diimonium-based or antimony having a near-infrared absorbing ability. It is possible to use a substrate formed by a melt-extrusion method from a dye such as a system-based or phthalocyanine-based dye and a polymer resin such as polymethylmethacrylate, copolyester, polyethylene terephthalate, polycarbonate, polystyrene, or triacetyl cellulose.

As the electromagnetic wave shielding layer having a near infrared ray shielding effect and / or an electromagnetic wave shielding effect of the near infrared ray absorbing panel of the present invention, a metal such as copper, gold, silver, aluminum or tin, or a metal salt thereof is used. Alternatively, a film formed by depositing or sputtering an oxide such as ITO on a transparent plastic film such as polyethylene terephthalate can be used.

Near-infrared rays, specifically a wavelength of 85, is particularly important as the characteristics required for the near-infrared absorbing panel.
Examples include absorption of light in the range of 0 nm to 1200 nm, transmission of light in the visible region, specifically, 400 nm to 700 nm, and color tone.

Of these characteristics, the absorption of near infrared rays is particularly important, but the other two characteristics are very important depending on the application. For example, when used as a near-infrared absorption panel that absorbs near-infrared rays generated from a video output device and prevents malfunction of a remote controller that operates in the near-infrared area, in addition to transparency in the visible area, this image is particularly important. When the output device has a color specification, the color tone is very important. That is, it is necessary to make the color difference for all colors before and after mounting the near-infrared absorbing panel extremely small, and specifically, it must have a gray or brown color tone. In this case, it is necessary to skillfully mix a plurality of dyes.

The dye used in the absorption layer of the near-infrared absorbing panel of the present invention may be any dye as long as it has absorption in the near-infrared region, for example, antimony-based, aluminum-based, diimonium-based, metal complex-based, Phthalocyanine dyes are particularly effective. Further, when these dyes have absorption in the visible light region, it is possible to adjust the color tone by using a color tone correcting dye. Phthalocyanine dyes are effective as such color tone correcting dyes.

The transparent polymer resin used as the binder of the dye in the absorption layer of the near infrared absorption panel of the present invention includes copolymerized polyester, polymethylmethacrylate,
Known transparent plastics such as polycarbonate, polystyrene, amorphous polyolefin, polyisocyanate, polyarylate, and triacetyl cellulose can be used. In addition, for example, in the field where high heat resistance is required, a highly heat resistant copolyester or polycarbonate is used, and in the field where high hardness is required, polymethylmethacrylate is used. Can be selected.

The above-mentioned aluminum-based and diimonium-based dyes having near-infrared absorbing ability are generally weak to heat. Therefore, using aluminum-based and diimonium-based dyes,
When a transparent polymer resin and an absorption layer are prepared by melt extrusion, particular attention must be paid to the molding temperature. In this case, it is important to select a polymer resin that can be molded at low temperature. Copolymerized polyester is particularly preferable as the resin that can be molded at low temperature, but low molecular weight polymethylmethacrylate is preferably used in the field where surface hardness is required.

In preparing the near-infrared absorbing panel of the present invention, it has a near-infrared shielding effect and / or an electromagnetic shielding effect with an absorption layer in which a dye having a near-infrared absorbing ability is dispersed in a transparent polymer resin. It is necessary to bond the electromagnetic wave shielding layer with an appropriate method. For this purpose, a polymer adhesive that is transparent and has high adhesive strength is preferably used. Examples of such polymer adhesives include two-component epoxy adhesives, unsaturated polyester, urethane adhesives, phenol resin adhesives, vinyl resin and acrylic acid adhesives. .

The near-infrared absorbing panel of the present invention comprises an absorbing layer in which a dye having a near-infrared absorbing ability is dispersed in the above-mentioned transparent polymer resin and an electromagnetic shielding effect having a near-infrared shielding effect and / or an electromagnetic shielding effect. Although it may be used only as a closed layer, it is usually used as a multilayer board in which an antireflection layer, a “glare” prevention layer and the like are used in combination with the layer. The antireflection layer prevents surface reflection and increases light transmittance. The "glare" prevention layer prevents "glare" of the electromagnetic shielding layer. Usually, a material obtained by subjecting a polyester film to vapor deposition or surface treatment is preferably used, but the material is not limited to this. It is also possible to use a single vapor-deposited film that also serves as an electromagnetic shielding layer and an antireflection layer.

Next, an embodiment of the present invention will be specifically described with reference to FIG.

[0017]

EXAMPLES Near-infrared absorption, visible region transmittance, and color tone in the examples were evaluated by the following methods.

(1) Near-infrared absorption By a spectrophotometer (best V-570 manufactured by JASCO Corporation),
The average value (Tr) of the light transmittance in wavelength 900nm-1200nm was measured, and it evaluated by (1-Tr).

(2) Visible range transmittance: wavelength 400 nm to 700 with the same spectrophotometer as in (1)
The average light transmittance (Tv) in nm was measured and evaluated by Tv.

(3) Color tone With respect to the color tone of D93 (X = 0.281, Y = 0.331), the color difference (ΔX, ΔY) between the normal and the case of passing through the near-infrared absorption panel is measured by a color difference meter ( It was measured with Minolta CM-1). The larger this number is, the less visible the corresponding color is.

Example 1 Polymethyl methacrylate was used as a resin, and a metal complex dye (SIR-128 manufactured by Mitsui Toatsu Co., Ltd.) was used as a dye capable of absorbing near infrared rays in an amount of 0.0018% by weight based on the polymer and a phthalocyanine dye. Dye (Nippon Shokubai Co., Ltd. e-ex color 803K) 0.0018% by weight based on the polymer
It was obtained by vapor-depositing ITO and a metal such as copper or silver, or an oxide thereof on a polyester film using a substrate having a thickness of 2 mm formed by a melt extrusion method at 240 ° C. as an absorption layer. A 200 μm thick film having a near-infrared absorption effect and an electromagnetic wave shielding effect is used as an electromagnetic wave shielding layer, and these are stuck together, and a “glare” antireflection layer and an antireflection layer obtained by subjecting a polyester film to a surface treatment are provided. Adhesion was performed to prepare a near infrared ray absorbing panel, and the characteristics were evaluated.

FIG. 2 shows the spectral characteristics of this near infrared absorption panel.
Shown in

The near infrared absorptivity of this panel was as good as 97%. The transparency in the visible region was 55%, which was high in transparency. Further, the color difference is ΔX = −0.0002, ΔY = −
It was as good as 0.0003.

Example 2 As a dye capable of absorbing near infrared rays, a metal complex dye (SIR-128 manufactured by Mitsui Toatsu Co., Ltd.) was used in an amount of 0.0 with respect to the polymer.
0.003% by weight of phthalocyanine dye (Eex Color 803K manufactured by Nippon Shokubai Co., Ltd.) with respect to the polymer.
A near-infrared absorbing panel was produced in the same manner as in Example 1 except that 2% by weight was used, and the characteristics were evaluated.

The near infrared absorptivity of this panel was as good as 97%. The transparency in the visible region was 60%, which was high in transparency. Further, the color difference is ΔX = −0.0008, ΔY = −
It was as good as 0.0010.

Example 3 As a dye capable of absorbing near infrared rays, a metal complex dye (SIR-128 manufactured by Mitsui Toatsu Co., Ltd.) was used in an amount of 0.0 with respect to the polymer.
042% by weight and 0.0% of phthalocyanine dye (Eex Color 803K manufactured by Nippon Shokubai Co.) with respect to the polymer.
A near-infrared absorbing panel was prepared in the same manner as in Example 1 except that the amount of 008% by weight was used, and the characteristics were evaluated.

The near infrared absorption of this panel was as good as 97%. The transparency in the visible region was 63%, which was high in transparency. Further, the color difference is ΔX = −0.00180, ΔY =
It was good at -0.00270.

Comparative Example 1 A metal complex dye (SIR-128 manufactured by Mitsui Toatsu Co., Ltd.) was used as a dye having a near-infrared absorbing ability in an amount of 0.0 with respect to a polymer.
05% by weight and an aluminum pigment (IRG manufactured by Nippon Kayaku Co., Ltd.
A near-infrared absorbing panel was prepared in the same manner as in Example 1 except that -002) was used in an amount of 0.03% by weight based on the polymer, and the characteristics were evaluated.

This panel had a good near-infrared absorption of 97% and a high transparency in the visible region of 65%.
The color difference was ΔX = 0.01380 and ΔY = 0.01250, which were poor.

Comparative Example 2 A near-infrared absorbing panel prepared by dissolving a commercially available metal phthalocyanine compound in a monomer of methyl metaallylate and then polymerizing the solution was evaluated.

The panel had a good near-infrared absorption of 99%, a visible region transmittance of 60% and a high transparency.
The color difference is ΔX = −0.01500, ΔY = −0.0110.
It was 0 and bad.

The above results are summarized in Table 1.

As is clear from Table 1, Comparative Example 1,
No. 2 has a poor color tone, and Comparative Example 2 has a low visible region transparency and a poor color tone. On the other hand, Examples 1 to 3 have excellent near-infrared absorptivity, high transparency in the visible region, and good color tone.

[0034]

As described above, the near-infrared absorbing panel of the present invention is excellent in near-infrared absorptivity, has a high visible region transmittance, and has a good color tone, and is generated from an image output device or a lighting fixture. A near-infrared absorbing panel that absorbs near-infrared rays and prevents malfunctions of remote controllers that operate in the near-infrared region, photodiodes and solid-state image sensors (CCD) used in light-receiving elements and image pickup elements of optical devices
It is suitable as a near-infrared cut filter used for correction of light-receiving sensitivity and color tone of a camera. The near-infrared absorbing panel of the present invention has a good color tone, and is particularly effective for panels such as color displays.

[Brief description of drawings]

FIG. 1 is a diagram showing a laminated state of a film of Example 1.

FIG. 2 is a graph of the transmittance of the film of Example 1 at each wavelength.

[Explanation of symbols]

1 Absorption layer in which a dye having near-infrared absorbing ability is dispersed in transparent polymer resin 2 Electromagnetic wave shielding layer having near infrared ray shielding effect and / or electromagnetic wave shielding effect 3 Antireflection layer 4 "Glittering" prevention layer

[Table 1]

Claims (2)

[Claims] 1. A structure in which an absorption layer in which a dye having a near-infrared absorbing ability is dispersed in a transparent polymer resin and an electromagnetic wave shielding layer having a near infrared ray shielding effect and / or an electromagnetic wave shielding effect are bonded together. Near-infrared absorption panel characterized by being. 2. The near-infrared absorption characterized in that the absorption layer according to claim 1 is a substrate formed by a melt extrusion method from a dye having near-infrared absorption ability and a polymer resin. panel.