Abstract: A cleaning solution containing a compound represented by formula (1), a compound represented by formula (2), and water; and an inkjet printer cleaning method using the same. R1—O(EO)m(PO)nH??(1) R2—O(EO)LH??(2) In formula (1), R1 represents a linear or branched C1-C30 alkyl group. EO represents an ethyleneoxy group, and PO represents a propyleneoxy group. m and n each independently represent an integer of 1-5. m:n, which is the ratio between m and n, is at least 1:2 and smaller than 3:2. In formula (2), R2 represents a linear or branched C1-C30 alkyl group, or an aryl group. EO represents an ethyleneoxy group. L represents an integer of at least 10. Formula (1): R1—O(EO)m(PO)nH. Formula (2): R2—O(EO)LH.

Abstract: There is provided a line head assembly including: a line head having a first head, a second head and a third head arranged in a first direction, a tank positioned at a location above the line head. Each of the first head, the second head and the third head includes a first intra-head channel including a first pressure chamber and a first nozzle, a first supply port, and a first discharge port. The tank includes: a first supply channel connected to the first supply port of the first head, the first supply port of the second head and the first supply port of the third head, and a first discharge channel connected to the first discharge port of the first head, the first discharge port of the second head and the first discharge port of the third head.

Abstract: A plastic lens 1 for spectacles includes: a plastic base 2; and a dielectric multilayer film 4 formed on a film formation surface M of the base 2. The dielectric multilayer film 4 includes one or more low refractive index dielectric layers 6, one or more high refractive index dielectric layers 8, and an antibacterial layer 10. The antibacterial layer 10 is a dielectric layer containing metal ion-carrying zeolite, and is disposed closer to an air side than all of the low refractive index dielectric layers 6 and all of the high refractive index dielectric layers 8 are. A physical film thickness of the antibacterial layer 10 is less than 50 nm.

Abstract: A plastic optical product 1 includes optical multilayer films 6 formed via intermediate films 4 on both surfaces of a plastic base 2. In each optical multilayer film 6, SiO2 layers 10 made of SiO2 and ZrO2 layers 12 made of ZrO2 alternate such that a total number of the SiO2 layers 10 and the ZrO2 layers 12 is eight and a layer closest to the base 2 is the ZrO2 layer. The optical multilayer film 6 has a physical film thickness of not less than 480 nm and not greater than 530 nm. A total of physical film thicknesses of all the SiO2 layers 10 is not less than 350 nm and not greater than 440 nm. The ZrO2 layer 12 that is a first layer L1 closest to the base 2 has a physical film thickness of not less than 5 nm and not greater than 12 nm.

Abstract: A plastic optical product 1 includes optical multilayer films 6 formed via intermediate films 4 on both surfaces of a plastic base 2. In each optical multilayer film 6, SiO2 layers 10 made of SiO2 and ZrO2 layers 12 made of ZrO2 alternate such that a total number of the SiO2 layers 10 and the ZrO2 layers 12 is seven and a layer closest to the base 2 is the SiO2 layer. The SiO2 layer 10 disposed at a third layer L3 counting from the base 2 has a physical film thickness of not less than 210 nm and not greater than 270 nm. The ZrO2 layer 12 disposed at a second layer L2 counting from the base 2 has a physical film thickness of not less than 7 nm and not greater than 12 nm.

Abstract: An optical plastic product has an optical multilayer film formed on one or both surfaces of a base made of plastic, directly or via an intermediate film, wherein the optical multilayer film includes a tensile-stress high-refractive-index layer having tensile stress as internal stress and made of a high refractive index material, and a low refractive index layer made of a low refractive index material, and the tensile-stress high-refractive-index layer is disposed with a physical film thickness of not greater than 10 nm, in a first layer as counted from the base side in the optical multilayer film.

Abstract: The optical product includes an optical multilayer film which is disposed on one surface or both surfaces of a base directly or via an intermediate film. The optical multilayer film is obtained by alternately disposing an SiO2 layer and a ZrO2 layer, forming nine layers in total, such that a first layer counting from the base is the SiO2 layer. The optical thickness of the SiO2 layer as the first layer is not greater than 0.120×?/4 when a design wavelength is ? (500 nm), the optical thickness of the ZrO2 layer as a second layer is not less than 0.400×?/4, the optical thickness of the SiO2 layer as a third layer is not less than 0.230×?/4, and the optical thickness of the SiO2 layer as a seventh layer is not less than 0.450×?/4.

Abstract: An ink which comprises a water-insoluble colorant, a dispersant, a polymer resin, and water. The polymer resin is one of four monomers which are methacrylic acid and three monomers selected respectively from among C1- to C4-alkyl methacrylates, C6- to C10-alkyl acrylates, and unsaturated C2- to C4-alkyl methacrylates; and a reactive emulsifier having a radical-polymerizable double bond in the molecule. An ink-jet recording method in which the ink is used; a recording medium to which the ink has been adhered; and an ink-jet printer including a vessel filled with the ink.

Abstract: A plastic spectacle lens includes at least a plastic base. In the plastic spectacle lens, a difference between a highest transmittance and a lowest transmittance for light in a range of wavelengths of not less than 400 nm and not greater than 780 nm, is not greater than 10 points, and an internal transmittance of the base for light in a range (visible range) of wavelengths of not less than 380 nm and not greater than 780 nm is not less than 80% over the entirety of the range of the wavelengths.

Abstract: A cleaning solution containing a compound represented by formula (1), a compound represented by formula (2), and water; and an inkjet printer cleaning method using the same. R1—O(EO)m(PO)nH??(1) R2—O(EO)LH??(2) In formula (1), R1 represents a linear or branched C1-C30 alkyl group. EO represents an ethyleneoxy group, and PO represents a propyleneoxy group. m and n each independently represent an integer of 1-5. m:n, which is the ratio between m and n, is at least 1:2 and smaller than 3:2. In formula (2), R2 represents a linear or branched C1-C30 alkyl group, or an aryl group. EO represents an ethyleneoxy group. L represents an integer of at least 10. Formula (1): R1—O(EO)m(PO)nH. Formula (2): R2—O(EO)LH.

Abstract: A spectacle lens includes an optical multilayer film formed on at least one surface of a base. The spectacle lens is formed such that, in a reflectance distribution in a visible region, maximal values appear in a range of wavelengths that are not less than 440 nm and not greater than 460 nm and in a range of wavelengths that are not less than 620 nm and not greater than 640 nm. A blue light ray cutting rate calculated by using a calculation formula described in Japanese Industrial Standards “JIS T7333 Appendix C” is not less than 7% (preferably not less than 8%) in the spectacle lens. A YI value is not greater than 6 in the spectacle lens.

Abstract: A cleaning liquid including a compound represented by the following formula (1): (CH3)3C—R—O(C4H8O)L—(C3H6O)m—(C2H4O)n—H??(1) and water; and a method of cleaning an ink-jet printer using the cleaning liquid. In the formula (1), R represents a linear or branched C1 to C5 hydrocarbon group, and L, m, and n each represent the average number of repeats, and L?0, m?0, n>0, and (L+m)/n=1.5/1 to 1/1.5.

Abstract: In a neutral density filter, a base is formed from plastic, and a light absorbing film having a plurality of layers is disposed on at least one surface of the base. The light absorbing film includes a first layer from the base side that is a SiO2 layer or an Al2O3 layer. The light absorbing film includes one or more NiOx layers formed from NiOx (x is not less than 0 and not greater than 1). At least one of the NiOx layers is disposed between a base-side adjacent layer adjacent to the at least one of the NiOx layers on the base side, and an opposite-side adjacent layer which is formed from a material different from the base-side adjacent layer and which is adjacent to the at least one of the NiOx layers on the opposite side.

Abstract: An optical plastic product has an optical multilayer film formed on one or both surfaces of a base made of plastic, directly or via an intermediate film, wherein the optical multilayer film includes a tensile-stress high-refractive-index layer having tensile stress as internal stress and made of a high refractive index material, and a low refractive index layer made of a low refractive index material, and the tensile-stress high-refractive-index layer is disposed with a physical film thickness of not greater than 10 nm, in a first layer as counted from the base side in the optical multilayer film.

Abstract: A plastic spectacle lens includes at least a plastic base. In the plastic spectacle lens, a difference between a highest transmittance and a lowest transmittance for light in a range of wavelengths of not less than 400 nm and not greater than 780 nm, is not greater than 10 points, and an internal transmittance of the base for light in a range (visible range) of wavelengths of not less than 380 nm and not greater than 780 nm is not less than 80% over the entirety of the range of the wavelengths.

Abstract: A cleaning liquid including a compound represented by the following formula (1): (CH3)3C—R—O(C4H8O)L—(C3H6O)m—(C2H4O)n—H ??(1) and water; and a method of cleaning an ink-jet printer using the cleaning liquid. In the formula (1), R represents a linear or branched C1 to C5 hydrocarbon group, and L, m, and n each represent the average number of repeats, and L?0, m?0, n>0, and (L+m)/n=1.5/1 to 1/1.5.

Abstract: The optical product includes an optical multilayer film which is disposed on one surface or both surfaces of a base directly or via an intermediate film. The optical multilayer film is obtained by alternately disposing an SiO2 layer and a ZrO2 layer, forming nine layers in total, such that a first layer counting from the base is the SiO2 layer. The optical thickness of the SiO2 layer as the first layer is not greater than 0.120×?/4 when a design wavelength is ? (500 nm), the optical thickness of the ZrO2 layer as a second layer is not less than 0.400×?/4, the optical thickness of the SiO2 layer as a third layer is not less than 0.230×?/4, and the optical thickness of the SiO2 layer as a seventh layer is not less than 0.450×?/4.

Abstract: In a neutral density filter, a base is formed from plastic, and a light absorbing film having a plurality of layers is disposed on at least one surface of the base. The light absorbing film includes a first layer from the base side that is a SiO2 layer or an Al2O3 layer. The light absorbing film includes one or more NiOx layers formed from NiOx (x is not less than 0 and not greater than 1). At least one of the NiOx layers is disposed between a base-side adjacent layer adjacent to the at least one of the NiOx layers on the base side, and an opposite-side adjacent layer which is formed from a material different from the base-side adjacent layer and which is adjacent to the at least one of the NiOx layers on the opposite side.

Abstract: It is an object to provide an optical product and the like which have antireflective performance, require less number of types of materials for film formation, have a simple film structure which makes film formation easy and reduces costs, and have sufficient heat resistance. In the optical product, an optical multilayer film having a five-layer structure in which SiO2 and ZrO2 are alternately layered is provided on one or both of surfaces of a base. With a layer closest to the base being a first layer, a quotient obtained by dividing a physical thickness of a fourth layer that is ZrO2 by a physical thickness of a second layer that is ZrO2 is greater than or equal to 1 and not greater than 4.

Abstract: An optical product (spectacle lens) according to the present invention includes a base having a convex surface and a concave surface, and an optical multilayer film formed on at least the concave surface of the base. The optical multilayer film has, in total, six layers in which a first layer is closest to the base, and a layer formed of zirconium dioxide and a layer formed of silicon dioxide are alternately layered such that the first layer is the layer formed of zirconium dioxide. A physical film thickness of a fourth layer formed of silicon dioxide is greater than or equal to 10 nm and not greater than 22 nm. A sum of physical film thicknesses of the first layer formed of zirconium dioxide and a second layer formed of silicon dioxide is greater than or equal to 35 nm and not greater than 45 nm.