JP7169703B1 - 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 applied with a wide range of designs (for example, designs such as patterns, pictures, and photographs). A black layer (81) having infrared transmittance and a design layer (82) directly or indirectly overlapping with at least part of the black layer (81), wherein the design layer (82) is composed of a plurality of first color dots. comprising a first color pattern layer and a second color pattern layer made up of a plurality of second color dots overlapping at least a part of the first color pattern layer, the first color dots containing a pearl pigment; An infrared transmission filter, wherein the second color dots contain pearlescent pigments. [Selection diagram] 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

The transfer material for a full-surface panel described in Patent Document 1 has a large restriction on the width of the design. This is because the watermark layer is formed with a single ink. Therefore, it is difficult to apply a design that undergoes color separation, such as a picture or a photograph, to a transfer destination panel using this full-panel transfer material.

SUMMARY OF THE INVENTION An object of the present invention is to provide an infrared transmission filter that can be applied with a wide range of designs (for example, designs such as patterns, pictures, and photographs). 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 design layer that directly or indirectly overlaps with at least part of the black layer,
The design layer comprises 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 overlapping at least part of the first color pattern layer. with
The first color dots contain a pearl pigment,
wherein the second color dots contain a pearl pigment;
Infrared transmission filter.
Here, "the second color pattern layer composed of a plurality of second color dots""overlaps at least a part of the first color pattern layer" means that when the design layer is viewed in the perpendicular direction, It means that dots of the first color and dots of the second color coexist in a region where both (that is, the first color pattern layer and the second color pattern layer) are overlapped. In this region, at least one second color dot may overlap at least one first color dot.

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 further includes a design layer, the infrared transmission filter can have a design.

Moreover, since the design layer includes the first color pattern layer containing the pearl pigment and the second color pattern layer containing the pearl pigment, which overlaps at least a part of the first color pattern layer, color mixing is possible, This makes it possible to apply a wide range of designs (for example, designs such as patterns, pictures, and photographs). As a result, the design can be imparted to the equipment by attaching the infrared transmission filter to the equipment.

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

Item 2
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. ,
wherein the third color dots contain a pearl pigment;
Item 2. The infrared transmission filter according to item 1.
Here, "the third color pattern layer composed of a plurality of third color dots""overlaps at least a portion of the first color pattern layer and/or at least a portion of the second color pattern layer". means that, when the design layer is viewed in the perpendicular direction, in a region where the third color pattern layer overlaps at least one of the first color pattern layer and the second color pattern layer, the dots of the third color and the dots of the first color It means that at least one of color dots and second color dots are mixed. In this region, at least one third color dot may overlap at least one first color dot and/or at least one second color dot.

According to item 2, since the design layer includes a third color pattern layer containing a pearl pigment that at least partially overlaps the first color pattern layer and/or the second color pattern layer, color mixing is possible. , which can further expand the range of designs. For example, if the combination of colors of the first-color dots, the second-color dots, and the third-color dots is three primary colors for additive color mixture, additive color mixture is possible, thereby further expanding the range of designs. .

Item 3
3. The infrared transmission filter according to claim 1, further comprising a substrate having transparency.

According to Item 3, since the infrared transmission filter includes a base material, for example, when the black 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 design layer are used as the base material. It can be protected with wood. 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, 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 4
Item 4. The infrared transmission filter according to any one of Items 1 to 3, which has infrared transmission properties over the entire surface.

According to item 4, 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 5
A film for decorating an infrared transmission filter (hereinafter sometimes referred to as a "decorating film"),
Equipped with a design layer,
The design layer comprises 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 overlapping at least part of the first color pattern layer. with
The first color dots contain a pearl pigment,
wherein the second color dots contain a pearl pigment;
the film.

According to item 5, since the film has a design layer, by decorating an undecorated infrared transmission filter (for example, a black infrared transmission filter) with this film, a design is imparted to the infrared transmission filter. be able to.

Moreover, since the design layer includes the first color pattern layer containing the pearl pigment and the second color pattern layer containing the pearl pigment and overlapping at least a part of the first color pattern layer, color mixing is possible, This makes it possible to apply a wide range of designs (for example, designs such as patterns, pictures, and photographs).

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 omitted. (a) is a schematic plan view of an infrared transmission filter (specifically, an infrared transmission filter without a black layer) viewed in the vertical direction with the design layer placed in front; . On the other hand, (b) is a schematic cross-sectional view of the infrared transmission filter (specifically, the infrared transmission filter without the black layer) cut along the IIb cutting line shown in (a). It is a schematic sectional view of the film for decoration in 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.

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 and a design layer 82 . That is, the infrared transmission filter 8 is not only composed of the black layer 81 but also has the design layer 82 . The infrared transmissive filter 8 further comprises a substrate 83 , ie a substrate film 83 . The infrared transmission filter 8 further includes a layer (hereinafter, “peripheral layer”) 84 provided so as to surround the black layer 81 when the infrared transmission filter 8 is viewed in the vertical direction.

In at least part of the infrared transmission filter 8 , the base material 83 , the design layer 82 , and the black layer 81 are arranged in this order in the thickness direction of the infrared transmission filter 8 . That is, these (specifically, the base material 83 , the design layer 82 , and the black layer 81 ) are arranged in this order in the direction perpendicular to the infrared transmission filter 8 . Here, the expression "the base material 83, the design layer 82, and the black layer 81 are arranged in this order in the thickness direction of the infrared transmission filter 8" means between the base material 83 and the design layer 82 and between the design layer 82 and the design layer 82. and/or between the black layer 81 and/or other layers. The same applies to other expressions including the statement "arranged in this order".

<1.1. Substrate>
The infrared transmission filter 8 has a transparent base material 83 . Since the infrared transmission filter 8 includes the base material 83 , the black layer 81 and the design layer 82 can be protected by the base material 83 . Moreover, since the base material 83 has transparency, the design layer 82 can be visually recognized through the base material 83 . Note that the base material 83 also has infrared transmittance.

Examples of the base material 83 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 83 may be subjected to an easy-adhesion treatment. That is, the base material 83 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 83 is, for example, preferably 10 μm or more, more preferably 30 μm or more. The thickness of base material 83 may be, for example, 1000 μm or less, 700 μm or less, 500 μm or less, or 300 μm or less.

<1.2. Design layer>
The infrared transmission filter 8 has a design layer 82 . Since the infrared transmission filter 8 further includes the design layer 82, the infrared transmission filter 8 can have a design. The design layer 82 has infrared transmittance.

The design layer 82 can be provided on the base material 83 . Specifically, the design layer 82 can be provided on one of both surfaces of the substrate 83 .

The design layer 82 directly or indirectly overlaps at least a portion of the black layer 81 . In particular, it is preferable that the design layer 82 directly overlaps at least a portion of the black layer 81 .

The shape of the design layer 82, specifically, the shape of the design layer 82 when the infrared transmission filter 8 (or the design layer 82) is viewed in the perpendicular direction can be appropriately set according to the design. Of course, the size of the design layer 82 when the infrared transmission filter 8 is viewed in the perpendicular direction may be smaller than or equal to the size of the substrate 83 .

As shown in FIG. 2 , the design layer 82 includes a first color pattern layer made up of a plurality of first color dots 821 and a second color pattern layer made up of a plurality of second color dots 822 . The second color pattern layer overlaps at least a portion of the first color pattern layer. Note that the black layer 81 is omitted in FIG. 2 so that the structure of the design layer 82 can be easily understood. Since the design layer 82 includes the first color pattern layer containing the pearl pigment and the second color pattern layer containing the pearl pigment, which overlaps at least a part of the first color pattern layer, color mixing is possible. This makes it possible to apply a wide range of designs (for example, designs such as patterns, pictures, and photographs). As a result, by attaching the infrared transmission filter 8 to the equipment, the design can be imparted to the equipment.

In addition, the design layer 82 overlaps at least a portion of the first color pattern layer and/or at least a portion of the second color pattern layer, and a third color pattern composed of a plurality of third color dots 823. Further comprising a layer. Since the design layer 82 includes the third color pattern layer, it is possible to mix colors, thereby further expanding the range of designs. For example, when the combination of colors of the first color dot 821, the second color dot 822, and the third color dot 823 is three primary colors of additive color mixture, additive color mixture is possible, thereby further expanding the range of designs. be able to.

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 82) is viewed in the perpendicular direction. means.

Although the first-color dots 821, second-color dots 822, and third-color dots 823 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 821, the second color dots 822, and the third color dots 823 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 821 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.

In particular, at least one of the pattern layers (specifically, the first color pattern layer, the second color pattern layer and the third color pattern layer) constituting the design layer 82 has a halftone dot area ratio of 50% or more. It is preferably 60% or more. It may be 70% or more, 80% or more, or 90% or more.

The colors exhibited by the first color dots 821, the second color dots 822, and the third color dots 823 are different from each other, and each is one selected from the group consisting of red, green, and blue. preferable. These colors are the three primary colors of additive color mixture, so additive color mixture is possible with these color combinations, which expands the range of designs (for example, designs such as patterns, pictures, and photographs can be used in the design layer). 82).

Specifically, the color that the first-color dots 821 exhibit is not particularly limited, but is preferably one selected from the group consisting of red, green, and blue. Although the color of the second color dots 822 is not particularly limited, it is preferably one selected from the group consisting of red, green, and blue and is a different color from the first color dots 821 . The color of the third-color dots 823 is also not particularly limited, but is one selected from the group consisting of red, green, and blue, and is different from the first-color dots 821 and the second-color dots 822. Preferably.

The first color dots 821, the second color dots 822, and the third color dots 823 contain pearl pigments. Since these contain pearl pigments, the pearl pigments can generate reflected light (for example, interference light). Therefore, additive color mixture is possible when the combination of colors exhibited by the first color dot 821, the second color dot 822, and the third color dot 823 is, for example, the three additive primary colors, i.e., the three primary colors of colored light, As a result, the range of designs can be further expanded (for example, designs such as patterns, pictures, and photographs can be applied to the design layer 82).

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 contents of the pearl pigment in the first color dots 821, the second color dots 822, and the third color dots 823 can be set independently.

The first color dots 821, the second color dots 822, and the third color dots 823 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 821, the second color dots 822, and the third color dots 823 may be the same or different.

The first color dots 821, the second color dots 822, and the third color dots 823 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 821, the second color dots 822, and the third color dots 823 may be the same or different.

The first color dots 821, the second color dots 822, and the third color dots 823 can be formed with ink. In addition to the components (specifically, the above-described pearl pigments, resins, etc.) that can be contained in these dots (that is, the first color dots 821, the second color dots 822, and the third color dots 823), the ink includes, for example, a solvent and the like. can include 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. Black layer>
As shown in FIG. 1, 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 83 when the infrared transmission filter 8 is viewed in the vertical direction.

The black layer 81 is preferably a solid layer. Here, the “solid layer” means a layer in which the black layer 81 has no gaps when the infrared transmission filter 8 is viewed in the vertical direction. 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 solvents include organic solvents (eg, hydrocarbon-based solvents, ketone-based solvents, ester-based solvents, glycol-based solvents), 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. .

<1.4. 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 84 . When the infrared transmission filter 8 is viewed in the vertical direction, the edge of the peripheral layer 84 (strictly speaking, the inner edge) completely or partially overlaps the edge of the black layer 81 (strictly speaking, the outer edge). They may overlap or may not overlap. Note that the peripheral layer 84 can be provided on the base material 83 .

The peripheral layer 84 may or may not have infrared transparency. Here, whether or not the peripheral layer 84 has infrared transmittance can be determined, for example, in the region in which the peripheral layer 84 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 84 has infrared transmittance when the transmittance of at least one wavelength, preferably at least one wavelength within the wavelength range of 830 nm to 1250 nm, is 50% or more.

The peripheral layer 84 may 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 peripheral layer 84 can contain a colorant. For example, when the peripheral layer 84 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.

Peripheral layer 84 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 peripheral layer 84 can be formed with ink. The ink can contain, for example, a solvent in addition to the components that can be included in the peripheral layer 84 (specifically, the above-described resins, colorants, and the like). Examples of solvents include organic solvents (eg, hydrocarbon-based solvents, ketone-based solvents, ester-based solvents, glycol-based solvents), water, and the like. Examples of ink for forming the peripheral layer 84 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 84, 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 84 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 84 and the black layer 81, the peripheral layer 84 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>
The infrared transmission filter 8 has a near-infrared transmittance, specifically, at least one wavelength in the wavelength range of 800 nm to 1300 nm, preferably in the wavelength range of 830 nm to 1250 nm, at least in the region where the black layer 81 and the design layer 82 overlap. It is preferable that the transmittance of light of at least one wavelength is 50% or more. Here, it should be noted that "at least" in "at least the area where the black layer 81 and the design layer 82 overlap" modifies "the black layer 81 and the design layer 82". 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, it does not have a layer that does not have infrared transmission properties (that is, an infrared cut layer, for example, the peripheral layer 84 that does not have infrared transmission properties described above), The cost for forming the layer can be reduced.

<2. Method for producing an infrared transmission filter>
For the infrared transmission filter 8, for example, the design layer 82 is formed by printing ink on the base material 83 and drying it, and the ink is printed on the base material 83 on which the design layer 82 is formed and dried. Thus, the black layer 81 is formed, and if necessary, the peripheral layer 84 is formed by printing the ink and drying it. 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 82, the black layer 81, and the peripheral layer 84) 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 82 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. 3 , the decorative film 80 of this embodiment includes a design layer 82 and a substrate 83 . Decorative film 80 further comprises peripheral layer 84 .

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 design layer 82, the base material 83, and the peripheral layer 84) overlaps with the description of the structure and members of the infrared transmission filter 8, and is omitted. do. 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 83 of the decorative film 80 may be placed in front. That is, the design layer 82 of the decorative film 80 may be arranged closer to the infrared transmission filter than the base material 83 . On the other hand, the design layer 82 of the decorative film 80 may be placed on the front side. That is, the base material 83 of the decorative film 80 may be arranged closer to the infrared transmission filter than the design layer 82 .

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 84 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 mentioned. 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, in at least part of the infrared transmission filter 8, the base material 83, the design layer 82, and the black layer 81 are arranged in this order in the thickness direction of the infrared transmission filter 8. (See Figure 1). However, this embodiment is not limited to this configuration. For example, as shown in FIG. 4 , in at least part of infrared transmission filter 8 , black layer 81 , substrate 83 , and design layer 82 may be arranged in this order in the thickness direction of infrared transmission filter 8 . In addition, as shown in FIG. 5 , the infrared transmission filter 8 may further include a clear layer 88 . In this case, the black layer 81 , the base material 83 , the design layer 82 , and the clear layer 88 can be arranged in this order in the thickness direction of the infrared transmission filter 8 in at least a portion of the infrared transmission filter 8 . 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 have a clear layer 88 .

In the present embodiment described above, the configuration in which the infrared transmission filter 8 includes the base material 83 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 83 . Similarly, the decorative film 80 does not have to include the substrate 83 either.

In the present embodiment described above, the configuration in which the infrared transmission filter 8 includes the peripheral layer 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 peripheral layer 84 . Similarly, the decorative film 80 may not have the peripheral layer 84 .

In the above embodiment, the design layer 82 has the third color pattern layer (see FIG. 1). However, this embodiment is not limited to this configuration. For example, the design layer 82 does not have to include the third color pattern layer.

In the present embodiment described above, it was explained that the design layer 82 is composed of a first color pattern layer, a second color pattern layer, and a third color pattern layer (see FIG. 1). However, this embodiment is not limited to this. For example, the design layer 82 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 821. omitted. Therefore, the description of the first color pattern layer and the first color dots 821 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 821, the dots of the second color 822, the dots of the third color 823, and the dots of the fourth color, when the dots of the first color 821 are printed first on the substrate 83, these dots are Among them, it is preferable that the first color dot 821 has the lowest saturation and the highest lightness. White can be mentioned as a color that the first color dots 821 exhibit. When the color of the first color dots 821 is white, the first color dots 821 can form highlights (in other words, the brightest white portion). At this time, the first color dots 821 preferably contain a white or silver pearl pigment. According to this, compared to highlights that can be represented by additive color mixture, it is possible to form beautiful (for example, low-saturation) white highlights. Incidentally, in this case (specifically, when the first color dots 821 are printed on the substrate 83 first), the color exhibited by the second color dots 822 is selected from the group consisting of red, green, and blue. The third color dot 823 is one selected from the group consisting of red, green, and blue, and is a different color from the second color dot 822, and the fourth color It is preferable that the color of the dots is one selected from the group consisting of red, green, and blue, and that both the second color dots 822 and the third color dots 823 are different colors.

In the above-described embodiment, regarding the layers having designs, only the design layer 82 directly or indirectly overlaps at least part of the black layer 81 (see FIG. 1). However, this embodiment is not limited to this configuration. For example, a layer other than the design layer 82 (for example, the same layer as the design layer 82 except that it is solid) may directly or indirectly overlap other portions of the black layer 81 .

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).

<Test Example 1_WRGB5mass%>
A solid white ink layer is formed by screen printing white ink on a substrate film (HK33WF manufactured by Higashiyama Film Co., Ltd.), and a solid white ink layer is formed by screen printing red ink on the white ink layer. A solid green ink layer is formed by screen-printing green ink on the red ink layer, and a solid green ink layer is formed on the green ink layer by screen-printing blue ink. A solid black ink layer was formed by screen-printing black ink (IR BLACK BN manufactured by Seiko Advance Co., Ltd.) on the blue ink layer. A test filter was produced by such a procedure. The pearl pigments used in the white, red, green and blue inks were as follows. In any ink, the pearl pigment was used at 5% by mass based on 100% by mass of the ink.
White ink “TWINCLEPEARL SXA” (manufactured by Nihon Koken Kogyo Co., Ltd.)
Red ink “TWINCLEPEARL RXB” (manufactured by Nihon Koken Kogyo Co., Ltd.)
Green ink "TWINCLEPEARL GXB" (manufactured by Nihon Koken Kogyo Co., Ltd.)
Blue ink “TWINCLEPEARL BSB” (manufactured by Nihon Koken Kogyo Co., Ltd.)
The test filter had a transmittance of 67.8% at a wavelength of 940 nm.

<Test Example 2_RGB5mass%>
A test filter was produced in the same procedure as in Test Example 1, except that the white ink layer was not formed. Specifically, red ink is screen-printed on a substrate film (HK33WF manufactured by Higashiyama Film Co., Ltd.) to form a solid red ink layer, and green ink is screen-printed on the red ink layer. A solid green ink layer is formed, blue ink is screen-printed on the green ink layer to form a solid blue ink layer, and black ink is screen-printed on the blue ink layer. A solid black ink layer was formed. Each ink used is the same as in Test Example 1.
The test filter had a transmittance of 71.9% at a wavelength of 940 nm.

<Test Example 3_WRGB10% by mass>
A test filter was produced in the same procedure as in Test Example 1, except that the pearl pigment in each ink was changed to 10% by mass.
The test filter had a transmittance of 57.2% at a wavelength of 940 nm.

<Test Example 4_RGB10mass%>
A test filter was produced in the same procedure as in Test Example 2, except that the pearl pigment in each ink was changed to 10% by mass.
The test filter had a transmittance of 63.1% at a wavelength of 940 nm.

<Transmittance of test filters prepared in Test Examples 1 to 4>
The 940 nm wavelength transmittance of these test filters was a value that could be used as an infrared transmission filter.

<Production of test filter in Test Example 5>
On the base film (HK33WF manufactured by Higashiyama Film Co., Ltd.), white ink is screen-printed to form a white ink layer, then red ink is screen-printed to form a red ink layer, and then green. A green ink layer is formed by screen-printing the ink, then a blue ink layer is formed by screen-printing the blue ink, and black ink (IR BLACK BN manufactured by Seiko Advance) is applied on the blue ink layer. was screen-printed to form a solid black ink layer. A test filter was produced by such a procedure. Table 1 shows the halftone dot area ratios of the white, red, green and blue ink layers. The pearl pigments used in the white, red, green and blue inks were as follows. In any ink, the pearl pigment was used at 10% by mass based on 100% by mass of the ink.
White ink “Spectraval White” (manufactured by Merck)
Red ink “Spectraval Red” (manufactured by Merck)
Green ink “Spectraval Green” (manufactured by Merck)
Blue ink “Spectraval Blue” (manufactured by Merck)

<Production of test filters in Test Examples 6 to 84>
According to Tables 1 and 2, a test filter was produced in the same procedure as in Test Example 5, except that the halftone dot area ratio was changed. It should be noted that Test Examples 6 to 84 include examples (examples corresponding to item 1 above) and comparative examples (examples not corresponding to item 1 above). . For example, among Test Examples 6 to 10, Test Examples 6, 7, 8, and 10 correspond to Examples, and Test Example 9 corresponds to Comparative Example. The reason why Test Example 9 corresponds to the comparative example is that the dots forming the red ink layer (that is, R) and the dots forming the blue ink layer (that is, B) are not mixed. Specifically, in the thickness direction of the test filter, a solid green ink layer (i.e., G) exists between the red ink layer (i.e., R) and the blue ink layer (i.e., B). (that is, G) separates the two, so the dots that constitute the red ink layer (that is, R) and the dots that constitute the blue ink layer (that is, B) are not mixed.

表１および２において、「Ｗ」は白インキ層、「Ｒ」は赤インキ層、「Ｇ」は緑インキ層、「Ｂ」は青インキ層を意味する。なお、網点面積率１００％で示された層はベタ層である。「－」で示された層は、その試験例では存在しない。 <Transmittance of test filters prepared in Test Examples 5 to 84>
Tables 1 and 2 show the near-infrared transmittance of these test filters.

In Tables 1 and 2, "W" means a white ink layer, "R" means a red ink layer, "G" means a green ink layer, and "B" means a blue ink layer. Note that the layer shown with a halftone dot area ratio of 100% is a solid layer. Layers marked with a "-" were not present in that test example.

The transmittance of these test filters was also a value that can be used as an infrared transmission filter.

8... Infrared transmission filter, 81... Black layer, 82... Design layer, 821... First color dot, 822... Second color dot, 823... Third color dot, 83... Base material, 84... Peripheral layer, 80... Addition Decorative film, 88... clear layer

Claims (3)

a black layer having infrared transparency;
An infrared transmission filter comprising a design layer that directly or indirectly overlaps at least part of the black layer,
further comprising a substrate having transparency,
The design layer comprises 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 overlapping at least part of the first color pattern layer. with
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. highest,
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, drawings, and photographs;
The first color dots contain a pearl pigment,
The second color dots contain a pearl pigment,
The third color dots contain a pearl pigment,
wherein the fourth color dot contains a pearl pigment;
Infrared transmission filter. An infrared transmission filter according to claim 1, having infrared transmission properties over the entire surface. A film for decorating an infrared transmission filter,
Equipped with a design layer,
further comprising a substrate having transparency,
The design layer comprises 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 overlapping at least part of the first color pattern layer. with
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. highest,
The first color dots contain a pearl pigment,
The second color dots contain a pearl pigment,
The third color dots contain a pearl pigment,
wherein the fourth color dot contains a pearl pigment;
the film.

Images