JP7203456B1 - Infrared transmission filters and films for decorating infrared transmission filters - Google Patents

Abstract

An object of the present invention is to provide an infrared transmission filter that can be designed. An infrared transmission filter (8) comprising a black layer (81) having infrared transmission properties, a pearl layer (82) containing a pearl pigment, and a design layer (83), wherein at least part of the infrared transmission filter (8) includes a black layer. 81 , pearl layer 82 , and design layer 83 are arranged in this order in the thickness direction of infrared transmission filter 8 . The design layer 83 contains a colorant (for example, pigment, dye) capable of absorbing light of a certain wavelength among visible light. [Selection drawing] Fig. 1

Description

The present invention relates to an infrared transmission filter and a film for decorating the infrared transmission filter.

2. Description of the Related Art It is known to use an infrared transmission filter in a light receiving part of a remote controller, an infrared receiving part of a mobile phone, and the like. An infrared transmission filter can block visible light by absorbing it and transmit light in the infrared (for example, near-infrared) region. By using an infrared transmission filter in devices such as remote controls (for example, remote control receivers) and mobile phones (for example, infrared receivers for mobile phones), the effects of visible light on devices (for example, malfunctions) can be suppressed. can. Infrared transmission filters are sometimes called visible light cut filters because they perform such a function.

Infrared transmission filters are generally black in color because they absorb visible light. Regarding such an infrared transmission filter that has been attempted, for example, Patent Document 1 discloses a full-surface panel transfer material comprising an infrared transmission filter layer and a watermark pattern layer containing a pearl pigment on the infrared transmission filter layer. Have been described.

JP-A-7-56011

An object of the present invention is to provide an infrared transmission filter that can be designed. Another object of the present invention is to provide a film for decorating an infrared transmission filter.

In order to solve this problem, the present invention has the configuration of item 1 below.

Item 1
a black layer having infrared transparency;
a pearl layer containing a pearl pigment;
An infrared transmission filter comprising a design layer,
In at least part of the infrared transmission filter, the black layer, the pearl layer, and the design layer are arranged in this order in the thickness direction of the infrared transmission filter.
Infrared transmission filter.
Here, the “design layer” means a layer containing a colorant (for example, pigment, dye) capable of absorbing light of a certain wavelength among visible light.
The expression "the black layer, the pearl layer, and the design layer are arranged in this order in the thickness direction of the infrared transmission filter" means between the black layer and the pearl layer and between the pearl layer and the design layer. allows other layers to be present in at least one of That is, in the infrared transmission filter according to Item 1, another layer may or may not be present between at least one of the black layer and the pearl layer and between the pearl layer and the design layer. .

According to item 1, since the infrared transmission filter includes a black layer having infrared transmission properties, it is possible to absorb visible light while transmitting infrared rays. Therefore, for example, it is possible to prevent malfunction of a device (specifically, a device equipped with an infrared transmission filter) caused by the transmission of visible light.

Moreover, since the infrared transmission filter includes the pearl layer, reflected light (for example, interference light) can be generated. Specifically, the pearl pigment in the pearl layer can generate reflected light.

Moreover, since the infrared transmission filter further includes a design layer, the design layer can function as a color filter. Specifically, the design layer can function as a color filter that absorbs a certain wavelength of visible light included in reflected light from the pearl pigment. As a result, designs can be applied to the infrared transmission filter.

It is preferable that the present invention further include the configuration of item 2 and subsequent items below.

Item 2
Item 2. The infrared transmission filter according to item 1, wherein the design layer comprises a layer composed of a plurality of dots.

According to item 2, since the design layer has a layer composed of a plurality of dots, it is possible to design using dots. For example, the plurality of dots includes a first color dot, a second color dot, and a third color dot, and the colors of these (i.e., the first color dot, the second color dot, and the third color dot) are When the combination is the three primary colors of subtractive color mixture, since subtractive color mixture is possible, designs using subtractive color mixture (for example, designs such as pictures and photographs that undergo color separation) can be applied.

Item 3
Item 3. The infrared transmission filter according to Item 1 or 2, wherein the design layer comprises a solid layer.
Here, the "solid layer" means a solid layer in which voids (which can be said to be through holes that constitute the design) may be formed.

According to item 3, since the design layer has a solid layer, it is possible to design using solid printing.

Item 4
Item 4. The infrared transmission filter according to any one of Items 1 to 3, further comprising a substrate having transparency.

According to Item 4, since the infrared transmission filter includes a base material, for example, when the black layer, the pearl layer, the design layer, and the base material are arranged in this order in the thickness direction of the infrared transmission filter, the black layer and the pearl A layer and a design layer can be protected with a substrate. Moreover, since the substrate has transparency, the design layer can be visually recognized through the substrate.

On the other hand, when the black layer, base material, pearl layer, and design layer are arranged in this order in the thickness direction of the infrared transmission filter, the black layer can be protected by the base material.

Item 5
The infrared transmission filter according to any one of claims 1 to 4, which has infrared transmission properties over its entire surface.

According to item 5, the infrared transmission filter has infrared transmission properties over the entire surface, that is, does not have a layer that does not have infrared transmission properties (hereinafter sometimes referred to as "infrared cut layer"). can reduce the cost of forming the

Item 6
Item 6. The infrared transmission filter according to any one of Items 1 to 5, wherein the pearl layer comprises a solid layer.
Here, too, the “solid layer” means a solid layer that may have voids formed therein.

According to item 6, since the pearl layer has a solid layer, compared to the case where the halftone dot area ratio (that is, the ratio of the area covered with dots to the unit area) is less than 100%, the black layer The influence of the color of the design layer on the color of the design layer can be reduced.

Item 7
A film for decorating an infrared transmission filter (hereinafter sometimes referred to as a "decorating film"),
a pearl layer containing a pearl pigment;
A design layer that directly or indirectly overlaps at least part of the pearl layer,
the film.

According to Item 7, since the decorative film includes a pearl layer containing a pearl pigment, reflected light (for example, interference light) can be generated.

Moreover, since the decorative film further includes a design layer, the design layer can function as a color filter. Specifically, the design layer can function as a color filter that absorbs a certain wavelength of visible light included in reflected light from the pearl pigment.

As a result, the decorating film can decorate an infrared transmitting filter, for example, an undecorated infrared transmitting filter.

It is a schematic sectional drawing of the infrared transmission filter in this embodiment. (a) and (b) are partially enlarged views of the infrared transmission filter of the present embodiment with the black layer and the pearl layer omitted. (a) is a schematic view of the infrared transmission filter (specifically, the infrared transmission filter with the black layer and the pearl layer omitted) with the design layer placed in front, when viewed in the vertical direction, that is, a schematic plane It is a diagram. On the other hand, (b) is a schematic cross-sectional view of the infrared transmission filter (specifically, the infrared transmission filter from which the black layer and the pearl layer are omitted) cut along the IIb cutting line shown in (a). . FIG. 2 is a schematic cross-sectional view (partially enlarged version) of an infrared transmission filter according to the present embodiment; FIG. 3 differs from FIG. 2(b) in that the black layer and the pearl layer are not omitted in FIG. 3, whereas they are omitted in FIG. 2(b). It is a schematic sectional view of the film for decoration in this embodiment. It is a schematic sectional drawing (partially enlarged version) of the infrared transmission filter which concerns on the modification of this embodiment. It is a schematic sectional drawing of the infrared transmission filter which concerns on the modification of this embodiment. It is a schematic sectional drawing of the infrared transmission filter which concerns on the modification of this embodiment. FIG. 4 is a schematic cross-sectional view of a decorative film according to a modified example of the present embodiment; It is a schematic sectional drawing of the infrared transmission filter which concerns on the modification of this embodiment.

Embodiments of the present invention will be described below.

<1. Infrared Transmission Filter>
As shown in FIG. 1 , the infrared transmission filter 8 of this embodiment includes a black layer 81 , a pearl layer 82 and a design layer 83 . In other words, the infrared transmission filter 8 is not only composed of the black layer 81 but also has the pearl layer 82 and the design layer 83 . The infrared transmissive filter 8 further comprises a substrate 84 , ie a substrate film 84 . The infrared transmission filter 8 further includes a layer (hereinafter, “peripheral layer”) 85 provided so as to surround the black layer 81 when the infrared transmission filter 8 is viewed in the vertical direction.

In at least a portion of infrared transmission filter 8 , black layer 81 , pearl layer 82 , design layer 83 , and substrate 84 are arranged in this order in the thickness direction of infrared transmission filter 8 . That is, these (specifically, the black layer 81 , the pearl layer 82 , the design layer 83 , and the base material 84 ) are arranged in this order in the direction perpendicular to the infrared transmission filter 8 . Here, the expression "the black layer 81, the pearl layer 82, the design layer 83, and the base material 84 are arranged in this order in the thickness direction of the infrared transmission filter 8" means between the black layer 81 and the pearl layer 82. , and between the pearl layer 82 and the design layer 83 and between the design layer 83 and the base material 84, at least one other layer is allowed to exist. The same applies to other expressions including the statement "arranged in this order".

<1.1. Black layer>
The infrared transmission filter 8 includes a black layer 81 having infrared transmission properties. Since the infrared transmission filter 8 includes the black layer 81 that transmits infrared rays, it can absorb visible light while transmitting infrared rays. Therefore, for example, it is possible to prevent the occurrence of malfunction of the device (specifically, the device equipped with the infrared transmission filter 8) caused by the transmission of visible light. The color of the black layer 81 is of course not limited to completely achromatic black, and may have some tint.

The shape of the black layer 81, specifically, the shape of the black layer 81 when the infrared transmission filter 8 is viewed in the perpendicular direction can be appropriately set. The size of the black layer 81 is preferably smaller than the size of the substrate 84 when the infrared transmission filter 8 is viewed in the vertical direction.

The black layer 81 is preferably a solid layer. Here, "solid layer" means a solid layer. That is, it is preferable that the black layer 81 is solid.

Although the thickness of the black layer 81 is not particularly limited, it is preferably 1 μm to 50 μm, for example. The black layer 81 may have a single-layer structure or a multi-layer structure.

The black layer 81 can contain resin. Examples of resins include natural resins, acrylic resins, styrene-acrylic resins, styrene-maleic acid-based resins, styrene-maleic acid-acrylic resins, cellulose nitrate, polyamide resins, polyurethane resins, polyester resins, polyvinyl chloride, and the like. can be mentioned. These can be used alone or in combination of two or more.

Black layer 81 may contain a colorant. As the colorant, a colorant having excellent near-infrared transmittance can be used. For example, it is possible to use a coloring agent having excellent transparency to at least one wavelength in the wavelength range of 800 nm to 1300 nm, preferably at least one wavelength in the wavelength range of 830 nm to 1250 nm. Incidentally, the coloring agent may be a pigment or a dye.

The black layer 81 may further include additives. Examples of additives include antifoaming agents, leveling agents, lubricants, and the like. These can be used alone or in combination of two or more.

The black layer 81 can be formed with ink. The ink can contain, for example, a solvent in addition to the components that can be contained in the black layer 81 (specifically, the above-described resin, colorant, etc.). Examples of the solvent include organic solvents (eg, hydrocarbon-based solvents, ketone-based solvents, ester-based solvents, glycol-based solvents, etc.), water, and the like. Examples of ink for forming the black layer 81 include IR inks manufactured by Seiko Advance, such as IR BLACK NX, IR BLACK OL, IR BLACK Modified A, IR BLACK PEX, IR BLACK BN, and IR BLACK FLAT. .

<1.2. Pearl layer>
The infrared transmission filter 8 has a pearl layer 82 . Since the infrared transmission filter 8 includes the pearl layer 82, reflected light (for example, interference light) can be generated. Specifically, the pearl pigment in the pearl layer 82 can generate reflected light.

Pearl layer 82 is preferably in contact with at least both black layer 81 and design layer 83 . In other words, the pearl layer 82 preferably connects at least the black layer 81 and the design layer 83 between the black layer 81 and the design layer 83 .

The shape of the pearl layer 82, specifically, the shape of the pearl layer 82 when the infrared transmission filter 8 is viewed in the perpendicular direction can be appropriately set. The size of the pearl layer 82 is preferably smaller than the size of the substrate 84 when the infrared transmission filter 8 is viewed in the vertical direction.

Pearl layer 82 is preferably a solid layer. Here, the "solid layer" means a solid layer in which voids may be formed. That is, it is preferable that the pearl layer 82 is solid. When the pearl layer 82 is a solid layer, the influence of the color of the black layer 81 on the color of the design layer 83 can be reduced compared to the case where the halftone dot area ratio is less than 100%.

Although the thickness of the pearl layer 82 is not particularly limited, it is preferably 1 μm to 50 μm, for example. The pearl layer 82 may have a single-layer structure or a multi-layer structure.

The thickness of the pearl layer 82 may be the same as the thickness of the black layer 81 , greater than the thickness of the black layer 81 , or less than the thickness of the black layer 81 .

The pearl layer 82 can contain resin. Examples of resins include natural resins, acrylic resins, styrene-acrylic resins, styrene-maleic acid-based resins, styrene-maleic acid-acrylic resins, cellulose nitrate, polyamide resins, polyurethane resins, polyester resins, polyvinyl chloride, and the like. can be mentioned. These can be used alone or in combination of two or more.

Pearl layer 82 contains a pearl pigment. Since the pearl layer 82 contains the pearl pigment, the pearl pigment can generate reflected light (for example, interference light).

A pearl pigment is a pigment capable of exhibiting pearl luster. The pearl pigment may be of so-called interference type, so-called coloring type, or so-called composite type. One kind or two or more kinds of pearl pigments can be used.

The pearl pigment preferably comprises a substrate and a metal oxide covering the substrate. Examples of base materials for pearl pigments include mica, glass, bismuth oxychloride, alumina, and silica. Examples of metal oxides include anatase-type titanium oxide, rutile-type titanium oxide, and iron oxide. The pearl pigment may further comprise an organic colored layer. That is, the pearl pigment may be further coated with an organic colored layer.

Since the size (for example, particle size) of the pearl pigment affects the near-infrared transmittance, it is preferable to set the size of the pearl pigment appropriately in consideration of the near-infrared transmittance.

The content of the pearl pigment is preferably 0.5% by mass or more, more preferably 1.0% by mass or more, still more preferably 2.0% by mass or more, and further preferably 3.0% by mass or more in 100% by mass of the ink. preferable. The content of the pearl pigment is preferably 30% by mass or less, more preferably 25% by mass or less, still more preferably 20% by mass or less, and even more preferably 15% by mass or less in 100% by mass of the ink. This is because the near-infrared transmittance tends to increase as the pearl pigment content decreases.

The pearl layer 82 may further contain additives. Examples of additives include antifoaming agents, leveling agents, lubricants, and the like. These can be used alone or in combination of two or more.

The pearl layer 82 can be formed with ink. The ink can contain, for example, a solvent in addition to the components that can be included in the pearl layer 82 (specifically, pearl pigment, resin, etc.). Examples of the solvent include organic solvents (eg, hydrocarbon-based solvents, ketone-based solvents, ester-based solvents, glycol-based solvents, etc.), water, and the like.

<1.3. Design layer>
The infrared transmission filter 8 has a design layer 83 . Since the infrared transmission filter 8 includes the design layer 83, the design layer 83 can function as a color filter. Specifically, the design layer 83 can function as a color filter that absorbs a certain wavelength of visible light included in reflected light from the pearl pigment. As a result, the infrared transmission filter 8 can be designed.

The design layer 83 can be provided on the base material 84 . Specifically, the design layer 83 can be provided on one of both surfaces of the substrate 84 .

The design layer 83 directly or indirectly overlaps at least a portion of the pearl layer 82 . Above all, it is preferable that the design layer 83 directly overlaps at least a portion of the pearl layer 82 .

The shape of the design layer 83, specifically the shape of the design layer 83 when the infrared transmission filter 8 (or the design layer 83) is viewed in the perpendicular direction, can be appropriately set according to the design. Of course, the size of the design layer 83 when the infrared transmission filter 8 is viewed in the perpendicular direction may be smaller than or equal to the size of the substrate 84 .

As shown in FIGS. 2 and 3, the design layer 83 includes a first color pattern layer composed of a plurality of first color dots 831 and a second color pattern layer composed of a plurality of second color dots 832. Prepare. The second color pattern layer may or may not overlap at least a portion of the first color pattern layer. Here, "the second color pattern layer overlaps at least a part of the first color pattern layer" means that both (that is, the first color pattern layer and the This means that the first color dots 831 and the second color dots 832 are mixed in the region where the second color pattern layer) overlaps. Incidentally, at least one of the second color dots 832 may overlap at least one of the first color dots 831 in this area. In FIG. 2, the black layer 81 and the pearl layer 82 are omitted so that the structure of the design layer 83 can be easily understood. Since the design layer 83 includes the first color pattern layer and the second color pattern layer, it is possible to mix colors, thereby making it possible to apply a wide range of designs (for example, designs such as patterns, pictures, and photographs).

In addition to this, the design layer 83 is composed of a plurality of third color dots 833 which may overlap at least a portion of the first color pattern layer and/or at least a portion of the second color pattern layer. A third color pattern layer is further provided. When the combination of colors of the first color dot 831, the second color dot 832, and the third color dot 833 is, for example, the three primary colors of subtractive color mixture, subtractive color mixture is possible. , a design that undergoes color separation, such as a picture or a photograph).

The spread of the first color pattern layer, the second color pattern layer and the third color pattern layer can be set independently according to the design. Here, the spread of the first color pattern layer, the second color pattern layer and the third color pattern layer means the spread of these layers when the infrared transmission filter 8 (or the design layer 83) is viewed in the perpendicular direction. means.

Although the first-color dots 831, second-color dots 832, and third-color dots 833 are shown as circular, their shape may be, for example, rectangular, polygonal, or otherwise. may be in the shape of The shapes of the first color dots 831, the second color dots 832, and the third color dots 833 can be set independently.

The halftone dot area ratio of the first color pattern layer, that is, the ratio of the area covered with the first color dots 831 to the unit area can be appropriately set according to the design, and can be, for example, 1% to 99%. . Here, "(the halftone dot area ratio) is 1% to 99%" means that the halftone dot area ratio falls within 1% or more and 99% or less. Therefore, for example, a first color pattern layer with a halftone dot area ratio of 30% and a first color pattern layer with a halftone dot area ratio ranging from 10% to 90% are "(halftone dot area ratio) 1% to 99% I would like to decline just in case that it falls under "is". The dot area ratio may be 5% or more, 10% or more, 20% or more, 30% or more, or 40% or more. , 50% or more, 60% or more, 70% or more, 80% or more, or 90% or more. The halftone dot area ratio may be 95% or less, or may be 90% or less. Note that the first color pattern layer may have a halftone dot area ratio that differs depending on the part, like dot gradation.

The explanation of the halftone dot area ratio of the second color pattern layer is the explanation of the halftone dot area ratio of the first color pattern layer (explanation that the halftone dot area ratio value and the halftone dot area ratio may differ depending on the part) ), so it is omitted. Therefore, the explanation of the halftone dot area ratio of the first color pattern layer can also be treated as the explanation of the halftone dot area ratio of the second color pattern layer. The explanation of the halftone dot area ratio of the third color pattern layer is also omitted for the same reason. Therefore, the explanation of the halftone dot area ratio of the first color pattern layer can also be treated as the explanation of the halftone dot area ratio of the third color pattern layer. The halftone dot area ratios of the first color pattern layer, the second color pattern layer and the third color pattern layer can be set independently.

The first-color dots 831, the second-color dots 832, and the third-color dots 833 have different colors, each of which is selected from the group consisting of cyan, magenta, and yellow. Preferably. Since these colors are the three primary colors of subtractive color mixing, subtractive color mixing is possible by combining these colors. can be done.

Specifically, the color that the first-color dots 831 exhibit is not particularly limited, but is preferably one selected from the group consisting of cyan, magenta, and yellow. The color exhibited by the second-color dots 832 is also not particularly limited, but should be one selected from the group consisting of cyan, magenta, and yellow, and should be a different color from the first-color dots 831. is preferred. The color of the third-color dots 833 is also not particularly limited, but is one selected from the group consisting of cyan, magenta, and yellow, and is different from the first-color dots 831 and the second-color dots 832. preferably a bright color.

The first color dots 831, the second color dots 832, and the third color dots 833 can contain resin. Examples of resins include natural resins, acrylic resins, styrene-acrylic resins, styrene-maleic acid-based resins, styrene-maleic acid-acrylic resins, cellulose nitrate, polyamide resins, polyurethane resins, polyester resins, polyvinyl chloride, and the like. can be mentioned. These can be used alone or in combination of two or more. The resins of the first color dots 831, the second color dots 832, and the third color dots 833 may be the same or different.

The first-color dots 831, the second-color dots 832, and the third-color dots 833 contain colorants capable of absorbing certain wavelengths of visible light. Examples of the coloring agent include cyan coloring agent, magenta coloring agent, and yellow coloring agent, when the color is used as an index. Incidentally, the coloring agent may be a pigment or a dye. Among them, pigments are preferred. One or more colorants can be used in the first color dots 831, the second color dots 832, and the third color dots 833.

Specifically, although the color of the coloring agent for the first color dots 831 is not particularly limited, it is preferably one selected from the group consisting of cyan, magenta, and yellow. The color of the coloring agent of the second color dots 832 is also not particularly limited, but is one selected from the group consisting of cyan, magenta, and yellow, and is the same as the color of the coloring agent of the first color dots 831. are preferably different colors. The color of the coloring agent of the third-color dots 833 is also not particularly limited, but is one selected from the group consisting of cyan, magenta, and yellow, and is also the color of the coloring agent of the first-color dots 831. , the color of the second color dot 832 is also preferably different.

The first color dots 831, the second color dots 832, and the third color dots 833 may further contain additives. Examples of additives include antifoaming agents, leveling agents, lubricants, and the like. These can be used alone or in combination of two or more. The additives of the first color dots 831, the second color dots 832, and the third color dots 833 may be the same or different.

The first color dots 831, the second color dots 832, and the third color dots 833 can be formed with ink. The ink contains, in addition to the components (specifically, resin, colorant, etc.) that can be contained in these dots (that is, the first color dots 831, the second color dots 832, and the third color dots 833), for example, a solvent. be able to. Examples of the solvent include organic solvents (eg, hydrocarbon-based solvents, ketone-based solvents, ester-based solvents, glycol-based solvents, etc.), water, and the like.

<1.4. Substrate>
The infrared transmission filter 8 has a transparent base material 84 . Since the infrared transmission filter 8 includes the base material 84 , the black layer 81 , the pearl layer 82 and the design layer 83 can be protected by the base material 84 . Moreover, since the base material 84 has transparency, the design layer 83 can be visually recognized through the base material 84 . In addition, the base material 84 also has infrared transmittance.

Examples of the base material 84 include polyester film, polyolefin film, polystyrene film, polycarbonate film, and polyimide film. Examples of polyester films include polyethylene terephthalate film (PET film) and polyethylene naphthalate film (PEN film). Examples of polyolefin films include polyethylene films and polypropylene films. The polyester constituting the polyester film may be a homopolymer or a copolymer.

One side or both sides of the base material 84 may be subjected to an easy-adhesion treatment. That is, the base material 84 may have, for example, a plastic layer and an easy-adhesion layer on at least one surface of the plastic layer. The plastic layer may have a single layer structure or a multilayer structure.

The thickness of the base material 84 is, for example, preferably 10 μm or more, more preferably 30 μm or more. The thickness of the base material 84 may be, for example, 1000 μm or less, 700 μm or less, 500 μm or less, or 300 μm or less.

<1.5. Peripheral layer>
The infrared transmission filter 8 further includes a layer surrounding the black layer 81 when the infrared transmission filter 8 is viewed in the vertical direction, that is, a peripheral layer 85 . When the infrared transmission filter 8 is viewed in the vertical direction, the edge of the peripheral layer 85 (strictly speaking, the inner edge) overlaps the edge of the black layer 81 (strictly speaking, the outer edge), wholly or partially. They may overlap or may not overlap. Note that the peripheral layer 85 can be provided on the base material 84 .

The peripheral layer 85 may or may not have infrared transparency. Here, whether or not the peripheral layer 85 has infrared transmittance can be determined, for example, in the region in which the peripheral layer 85 of the infrared transmission filter 8 is formed, the transmittance of near infrared rays, specifically within the wavelength range of 800 nm to 1300 nm. It can be determined that the peripheral layer 85 has infrared transmittance when the transmittance of at least one wavelength, preferably at least one wavelength of 830 nm to 1250 nm, is 50% or more.

The peripheral layer 85 can contain resin. Examples of resins include natural resins, acrylic resins, styrene-acrylic resins, styrene-maleic acid-based resins, styrene-maleic acid-acrylic resins, cellulose nitrate, polyamide resins, polyurethane resins, polyester resins, polyvinyl chloride, and the like. can be mentioned. These can be used alone or in combination of two or more.

Peripheral layer 85 may contain a colorant. For example, when the peripheral layer 85 has infrared transmittance, a colorant having excellent near-infrared transmittance can be used as the colorant. For example, it is possible to use a coloring agent having excellent transparency to at least one wavelength in the wavelength range of 800 nm to 1300 nm, preferably at least one wavelength in the wavelength range of 830 nm to 1250 nm. Incidentally, the coloring agent may be a pigment or a dye.

The peripheral layer 85 may further contain additives. Examples of additives include antifoaming agents, leveling agents, lubricants, and the like. These can be used alone or in combination of two or more.

The peripheral layer 85 can be formed with ink. The ink can contain, for example, a solvent in addition to components that can be contained in the peripheral layer 85 (specifically, resin, colorant, etc.). Examples of the solvent include organic solvents (eg, hydrocarbon-based solvents, ketone-based solvents, ester-based solvents, glycol-based solvents, etc.), water, and the like. Examples of ink for forming the peripheral layer 85 include IR inks manufactured by Seiko Advance, such as IR BLACK NX, IR BLACK OL, IR BLACK Modified A, IR BLACK PEX, IR BLACK BN, and IR BLACK FLAT. .

In order to form the peripheral layer 85, ink having the same composition as the ink for forming the black layer 81 may be used. That is, the composition of the peripheral layer 85 may be the same as the composition of the black layer 81 . In this case, since a common ink can be used for the peripheral layer 85 and the black layer 81, the peripheral layer 85 and the black layer 81 can be printed together, and as a result, the number of man-hours can be reduced. can.

<1.5. Infrared transparency and design>
In the infrared transmission filter 8, at least the black layer 81, the pearl layer 82, and the design layer 83 are arranged in this order in the thickness direction of the infrared transmission filter 8. It is preferable that the transmittance of light of at least one wavelength within the wavelength range of 1300 nm, preferably at least one wavelength within the wavelength range of 830 nm to 1250 nm, is 50% or more. Here, "at least" in "the region where at least the black layer 81, the pearl layer 82, and the design layer 83 are arranged in this order in the thickness direction of the infrared transmission filter 8" means "the black layer 81, the pearl layer 82, and Just in case, I refuse to modify the design layer 83". This transmittance is more preferably 55% or higher, and even more preferably 60% or higher.

The infrared transmission filter 8 preferably has infrared transmission properties over the entire surface. Specifically, the infrared transmission filter 8 has a near-infrared transmittance over the entire surface, specifically at least one wavelength in the wavelength range of 800 nm to 1300 nm, preferably at least one wavelength in the wavelength range of 830 nm to 1250 nm. It is preferred that the ratio is 50% or more. Since the infrared transmission filter 8 has infrared transmission properties over the entire surface, that is, does not include a layer that does not have infrared transmission properties (that is, an infrared cut layer, for example, the peripheral layer 85 that does not have infrared transmission properties described above), The cost for forming the layer can be reduced.

The design applied to the infrared transmission filter 8 is not particularly limited. The design may be, for example, a pattern such as a pattern, pattern, picture, photograph, or figure, or may be a symbol such as a letter, a code, or a mark, and two or more of these may be used. may be any combination of Also, it may be plain.

<2. Method for producing an infrared transmission filter>
In the infrared transmission filter 8, for example, the design layer 83 is formed by printing ink on the base material 84 and drying it, and the ink is printed on the base material 84 on which the design layer 83 is formed and dried. By printing ink on the pearl layer 82 and drying it, the black layer 81 is formed. If necessary, ink is printed and dried to form the peripheral layer 85. can be created by the following procedure. The printing method for each layer is not particularly limited, and examples thereof include screen printing, rotary screen printing, flexographic printing, gravure printing, and inkjet printing. The printing method for each layer (specifically, the design layer 83, the pearl layer 82, the black layer 81, and the peripheral layer 85) can be determined independently. The printing method for each layer (for example, the first color pattern layer, the second color pattern layer, the third color pattern layer, etc.) constituting the design layer 83 can also be determined independently. Among them, screen printing is preferable.

<3. Example of using an infrared transmission filter>
Infrared transmission filter 8 can be used, for example, in devices such as infrared cameras and infrared sensors.

<4. Decorative film>
As shown in FIG. 4 , the decorative film 80 of this embodiment includes a pearl layer 82 , a design layer 83 and a substrate 84 . The decorative film 80 further includes a peripheral layer 85 . In at least part of the decorative film 80, the pearl layer 82, the design layer 83, and the substrate 84 are arranged in this order in the thickness direction of the decorative film 80.

That is, the decorative film 80 has the same structure as the infrared transmission filter 8 except that the black layer 81 is not provided. Therefore, the description of the structure and members of the decorative film 80 (specifically, the pearl layer 82, the design layer 83, the base material 84, and the peripheral layer 85) is the same as the description of the structure and members of the infrared transmission filter 8. Omitted due to duplication. Therefore, the description of the structure, members, etc. of the infrared transmission filter 8 can also be treated as the description of the structure, members, etc. of the decorative film 80 .

The decorative film 80 can be used to decorate an infrared transmitting filter, such as an undecorated infrared transmitting filter. As an undecorated infrared transmission filter, for example, a black infrared transmission filter can be mentioned.

When using the decorating film 80, the decorating film 80 can be arranged so that the decorating film 80 is in front of the infrared transmitting filter (for example, the undecorated infrared transmitting filter). At this time, the base material 84 of the decorative film 80 can be placed in front. That is, the pearl layer 82 of the decorative film 80 can be arranged closer to the infrared transmission filter than the base material 84 .

In order to decorate the infrared transmission filter, for example, the decorative film 80 may be adhered to the infrared transmission filter with an adhesive or adhesive. As a method, for example, a method of adhering the peripheral layer 85 of the decorative film 80 and the infrared transmission filter with an adhesive, an adhesive, or a double-sided tape (for example, a double-sided adhesive tape) can be used. On the other hand, when the infrared transmission filter is fitted in the equipment, the decorative film 80 can be fitted in the equipment in the same manner as the infrared transmission filter so that the decorative film 80 is in front of the infrared transmission filter. good. In this case, although it is not necessary to use an adhesive, adhesive, or double-sided tape, they may be attached using an adhesive, adhesive, or double-sided tape.

<4. Various modifications can be made to this embodiment>
Various modifications can be made to the embodiment described above. For example, one or more of the following modifications can be selected to modify the present embodiment described above.

In the present embodiment described above, the configuration in which the infrared transmission filter 8 includes the base material 84 has been described (see FIG. 1). However, this embodiment is not limited to this configuration. For example, infrared transmission filter 8 may not include substrate 84 . Similarly, the decorative film 80 does not have to include the substrate 84 either.

In the present embodiment described above, the configuration in which the infrared transmission filter 8 includes the peripheral layer 85 has been described (see FIG. 1). However, this embodiment is not limited to this configuration. For example, infrared transmission filter 8 may not include peripheral layer 85 . Similarly, the decorative film 80 may not have the peripheral layer 85 either.

In the above-described embodiment, it has been described that the pearl layer 82 is a solid layer. However, this embodiment is not limited to this configuration. For example, the pearl layer 82 is provided so as to surround not only the solid layer but also the solid layer (specifically, the pearl layer 82 is provided so as to surround the solid layer when the infrared transmission filter 8 is viewed in the perpendicular direction). , may further comprise a layer composed of a plurality of dots. The layer composed of dots may form a dot gradation together with the solid layer. Of course, the dots can contain components that can be included in the pearl layer 82 (specifically, pearl pigments, resins, etc.).

In the above embodiment, the design layer 83 is composed of the first color pattern layer, the second color pattern layer, and the third color pattern layer, but the present embodiment is not limited to this.
For example, the design layer 83 may further include a fourth color pattern layer composed of a plurality of fourth color dots. The description of the fourth color pattern layer and the fourth color dots (for example, shape, halftone dot area ratio, color, possible components, ink, etc.) overlaps with the description of the first color pattern layer and the first color dots 831. omitted. Therefore, the description of the first color pattern layer and the first color dots 831 can also be treated as the description of the fourth color pattern layer and the fourth color dots. Among the dots of the first color 831, the dots of the second color 832, the dots of the third color 833, and the dots of the fourth color, when the dots of the first color 831 are printed first on the substrate 84, these dots are Among them, it is preferable that the first color dot 831 has the lowest saturation and the lowest lightness. Black can be given as a color that the first color dots 831 exhibit. At this time, ink having the same composition as the ink for forming the black layer 81 may be used to form the first color dots 831 . That is, the composition of the first color dots 831 may be the same as the composition of the black layer 81 . In this case, since the common ink can be used for the first color dots 831 and the black layer 81, the number of inks can be reduced. Incidentally, in this case (specifically, when the first-color dots 831 are printed first on the substrate 84), the colors exhibited by the second-color dots 832 are the group consisting of cyan, magenta, and yellow. and the color exhibited by the third-color dots 833 is one selected from the group consisting of cyan, magenta, and yellow, and is a different color from the second-color dots 832. , and the color exhibited by the fourth color dot is one selected from the group consisting of cyan, magenta, and yellow, and the second color dot 832 and the third color dot 833 are different colors. Preferably.
On the other hand, as shown in FIG. 5, the design layer 83 may be composed only of the first color pattern layer.
Other examples can also be given. For example, the design layer 83 is an example provided with a solid layer. Here, the "solid layer" means a solid layer in which voids may be formed. In this case, the design layer 83 may be composed of a solid layer, or the design layer 83 may be provided with a solid layer and a layer composed of a plurality of dots. Regarding the latter, for example, the design layer 83 is provided so as to surround the solid layer and the solid layer (specifically, the design layer 83 is provided so as to surround the solid layer when the infrared transmission filter 8 is viewed in the perpendicular direction. ), further comprising a layer of dots. Here, the layer composed of a plurality of dots may be composed of, for example, a first color pattern layer, may be composed of a first color pattern layer and a second color pattern layer, and may be composed of a first color pattern layer and a second color pattern layer. It may be composed of a pattern layer, a second color pattern layer, and a third color pattern layer, and may be composed of a first color pattern layer, a second color pattern layer, a third color pattern layer, and a fourth color pattern layer. may be Note that the layer composed of a plurality of dots may form a dot gradation together with the solid layer. The solid layer and dots can contain components that can be included in the design layer 83 (specifically, resin, colorant, etc.). In this way, when the design layer 83 has a solid layer, it is possible to design using solid printing.

In the embodiment described above, in at least part of the infrared transmission filter 8, the black layer 81, the pearl layer 82, the design layer 83, and the base material 84 are arranged in this order in the thickness direction of the infrared transmission filter 8. Although the configuration has been described (see FIGS. 1 and 3), the present embodiment is not limited to this configuration.
For example, as shown in FIG. 6, in at least a portion of infrared transmission filter 8, substrate 84, black layer 81, pearl layer 82, and design layer 83 are arranged in this order in the thickness direction of infrared transmission filter 8. good too. In the case where the design layer 83 has a solid layer in which voids are formed, and the pearl layer 82 also has a solid layer in which voids are formed, at least part of the voids in the design layer 83 are the voids in the pearl layer 82. It preferably overlaps at least partially (this is not shown). That is, when the infrared transmission filter 8 is viewed in the perpendicular direction, the black layer 81 (strictly speaking, part of the black layer 81) can be visually recognized through at least part of the design layer 83. It is preferable that Thereby, the black layer 81 can be utilized in the design.
On the other hand, as shown in FIG. 7, in at least part of the infrared transmission filter 8, a black layer 81, a base material 84, a pearl layer 82, and a design layer 83 are arranged in this order in the thickness direction of the infrared transmission filter 8. good too. In the case where the design layer 83 has a solid layer in which voids are formed, and the pearl layer 82 also has a solid layer in which voids are formed, at least part of the voids in the design layer 83 are the voids in the pearl layer 82. It preferably overlaps at least partially (this is not shown). That is, when the infrared transmission filter 8 is viewed in the perpendicular direction, at least a part of the design layer 83 is passed through the base material 84 (strictly, part of the base material 84) and the black layer 81 (strictly, a part of the base material 84). A part of the black layer 81) is preferably configured to be visible. Thereby, the black layer 81 can be utilized in the design.

In the present embodiment described above, in at least part of the decorative film 80, the pearl layer 82, the design layer 83, and the substrate 84 are arranged in this order in the thickness direction of the decorative film 80. explained (see FIG. 4). However, this embodiment is not limited to this configuration. For example, as shown in FIG. 8, in at least part of the decorative film 80, the substrate 84, the pearl layer 82, and the design layer 83 may be arranged in this order in the thickness direction of the decorative film 80. .

In the present embodiment described above, regarding the layer having a design, only the design layer 83 directly or indirectly overlaps at least part of the pearl layer 82 (see FIG. 1). However, this embodiment is not limited to this configuration. For example, a layer having a design other than the design layer 83 may directly or indirectly overlap other portions of the pearl layer 82 .

Although the configuration in which the infrared transmission filter 8 includes a clear layer has not been described in the above-described embodiment, the infrared transmission filter 8 may further include a clear layer. For example, the infrared transmission filter 8 may further include a clear layer 88, as shown in FIG. In this case, in at least part of the infrared transmission filter 8, the clear layer 88, the black layer 81, the pearl layer 82, the design layer 83, and the base material 84 are arranged in this order in the thickness direction of the infrared transmission filter 8. can. The clear layer 88 can have transparency. The clear layer 88 can contain resin. Clear layer 88 preferably does not contain a coloring agent. Examples of coloring agents include pigments and dyes. The clear layer 88 may further contain additives. Examples of additives include antifoaming agents, leveling agents, lubricants, and the like. These can be used alone or in combination of two or more. The clear layer 88 may be formed by printing, for example, or by lamination (for example, lamination of adhesive films). Similarly, the decorative film 80 may also include a clear layer (for example, a clear layer 88).

EXAMPLES The present invention will be described in detail below with reference to Examples, but the present invention is not limited only to these Examples. Parts and % in the examples mean parts by mass and % by mass, respectively, unless otherwise specified.

<Method for measuring near-infrared transmittance>
The near-infrared transmittance, specifically the transmittance of light with wavelengths of 850 nm, 940 nm, 1100 nm, and 1200 nm, was measured with an ultraviolet-visible-near-infrared spectrophotometer V-570 (manufactured by JASCO Corporation).

<Comparative Example 1_IR Black>
A solid black ink layer was formed on a substrate film (HK33WF manufactured by Higashiyama Film Co., Ltd.) by screen-printing black ink (IR BLACK BN manufactured by Seiko Advance Co., Ltd.). A test filter was produced by such a procedure.
The test filter had a transmittance of 87.0% at a wavelength of 940 nm.

<Example 1_KMCY + Pearl + IR Black>
A solid black ink layer is formed by screen-printing black ink (IR BLACK BN manufactured by Seiko Advance Co., Ltd.) on a base film (HK33WF manufactured by Higashiyama Film Co., Ltd.), and on the black ink layer, A magenta ink (specifically, an ink containing a magenta pigment) is screen-printed to form a solid magenta ink layer, and a cyan ink (specifically, an ink containing a cyan pigment) is applied on the magenta ink layer. ) is screen-printed to form a solid cyan ink layer, and a solid yellow ink layer is formed by screen-printing a yellow ink (specifically, an ink containing a yellow pigment) on the cyan ink layer. to form a solid pearl layer on the yellow ink layer by screen-printing a white pearl-containing ink, and on the pearl layer, a solid black by screen-printing the above-mentioned black ink An ink layer was formed. A test filter was produced by such a procedure. The pearl pigment used in the white pearl-containing ink was "Spectraval White" (manufactured by Merck). This pearl pigment was used at 15% by mass based on 100% by mass of ink.
The test filter had a transmittance of 59.6% at a wavelength of 850 nm, a transmittance of 64.1% at a wavelength of 940 nm, a transmittance of 68.1% at a wavelength of 1100 nm, and a transmittance of 73.5% at a wavelength of 1200 nm. . Although these transmittances are lower than those of the test filter of Comparative Example 1, they are values that can be used as an infrared transmission filter.

<Example 2_KMCY + Pearl>
A test filter was produced in the same procedure as in Example 1, except that no black ink layer was formed on the pearl layer. It should be noted that this test filter can be positioned as an example in which the decorative film of the present invention is embodied.
The transmittance of this test filter at a wavelength of 940 nm was 67.7%. According to this result, the transmittance does not decrease significantly by stacking this test filter on an undecorated infrared transmitting filter (for example, a black infrared transmitting filter). Therefore, this test filter can be used to decorate an infrared transmission filter.

8... Infrared transmission filter, 81... Black layer, 82... Pearl layer, 83... Design layer, 831... First color dot, 832... Second color dot, 833... Third color dot, 84... Base material, 85... Periphery Layer, 80... Decorative film, 88... Clear layer

Claims (5)

a black layer having infrared transparency;
a pearl layer containing a pearl pigment;
An infrared transmission filter comprising a design layer,
further comprising a substrate having transparency,
In at least part of the infrared transmission filter, the black layer, the pearl layer , the design layer , and the substrate are arranged in this order in the thickness direction of the infrared transmission filter,
The design layer includes a first color pattern layer made up of a plurality of first color dots and a second color pattern layer made up of a plurality of second color dots, and the second color pattern layer comprises the second color pattern layer. overlaps at least a portion of the one-color pattern layer,
The design layer further comprises a third color pattern layer composed of a plurality of third color dots, overlapping at least a portion of the first color pattern layer and/or at least a portion of the second color pattern layer. ,
The design layer further comprises a fourth color pattern layer composed of a plurality of fourth color dots,
Among the dots of the first color, the dots of the second color, the dots of the third color, and the dots of the fourth color, the dots of the first color are first printed on the substrate;
Among the dots of the first color, the dots of the second color, the dots of the third color, and the dots of the fourth color, the first color dots have the lowest saturation and the lightness of the first color dots. lowest,
The infrared transmission filter has a design composed of at least the first color pattern layer , the second color pattern layer, the third color pattern layer, and the fourth color pattern layer, and the design includes: including at least one of patterns, designs, drawings, photographs, and symbols;
Infrared transmission filter. An infrared transmission filter according to claim 1, wherein the design layer comprises a solid layer. 3. The infrared transmission filter according to claim 1, which has infrared transmission properties over the entire surface. An infrared transmission filter according to any one of claims 1 to 3, wherein said pearl layer comprises a solid layer. A film for decorating an infrared transmission filter,
a pearl layer containing a pearl pigment;
a design layer directly or indirectly overlapping with at least part of the pearl layer,
further comprising a substrate having transparency,
The design layer includes a first color pattern layer made up of a plurality of first color dots and a second color pattern layer made up of a plurality of second color dots, and the second color pattern layer comprises the second color pattern layer. overlaps at least a portion of the one-color pattern layer,
The design layer further comprises a third color pattern layer composed of a plurality of third color dots, overlapping at least a portion of the first color pattern layer and/or at least a portion of the second color pattern layer. ,
The design layer further comprises a fourth color pattern layer composed of a plurality of fourth color dots,
Among the dots of the first color, the dots of the second color, the dots of the third color, and the dots of the fourth color, the dots of the first color are first printed on the substrate;
Among the dots of the first color, the dots of the second color, the dots of the third color, and the dots of the fourth color, the first color dots have the lowest saturation and the lightness of the first color dots. lowest,
The film has a design composed of at least the first color pattern layer , the second color pattern layer , the third color pattern layer, and the fourth color pattern layer, and the design includes patterns, including at least one of patterns, drawings, photographs, and symbols;
Films (except when the design layer contains a luster pigment) .

Images