WO2023058633A1 - 皮革調発光表示装置 - Google Patents
皮革調発光表示装置 Download PDFInfo
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- WO2023058633A1 WO2023058633A1 PCT/JP2022/037068 JP2022037068W WO2023058633A1 WO 2023058633 A1 WO2023058633 A1 WO 2023058633A1 JP 2022037068 W JP2022037068 W JP 2022037068W WO 2023058633 A1 WO2023058633 A1 WO 2023058633A1
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- light
- leather
- emitting display
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- emitting
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Images
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F13/00—Illuminated signs; Luminous advertising
- G09F13/04—Signs, boards or panels, illuminated from behind the insignia
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F13/00—Illuminated signs; Luminous advertising
- G09F13/04—Signs, boards or panels, illuminated from behind the insignia
- G09F13/12—Signs, boards or panels, illuminated from behind the insignia using a transparent mirror or other light reflecting surface transparent to transmitted light whereby a sign, symbol, picture or other is visible only when illuminated
Definitions
- the present invention relates to a light-emitting display device having a leather-like appearance for light-emitting characters, graphics, patterns, and the like.
- Patent Document 1 discloses a synthetic leather made by laminating a skin layer made of polyurethane resin on a raw cloth and having a visible light transmittance of 0.10 to 11.90% in the wavelength range of 380 to 780 nm.
- Patent Document 1 discloses a black fabric obtained by laminating a skin layer colored black with a black pigment (manufactured by DIC Corporation, trade name “Dylac L-1770”) on a raw fabric that is a black polyester knit. Disclosed is that a synthetic leather having a visible light transmittance of 0.17 to 0.20% in the wavelength range of 380 to 780 nm was obtained.
- Patent Document 1 discloses that a white polyester knit fabric is laminated with a skin layer colored white with a white pigment (trade name “Dylac L-1781” manufactured by DIC Corporation). It discloses that a white synthetic leather having a visible light transmittance in the wavelength range of 380 to 780 nm of 10.87 to 11.90% was obtained.
- Patent Document 2 discloses a light-transmissive artificial leather sheet using a transparent or translucent elastomer sheet.
- This artificial leather sheet has a smoke printed layer on the back or front surface of the elastomer sheet, and the outermost layer on the back surface of the elastomer sheet has a design such as characters, figures, patterns, or a combination thereof.
- a leather-like light-emitting display device that employs a light-transmissive artificial leather sheet having a mask-printed layer and having leather-patterned unevenness on the surface of the elastomer sheet.
- the present invention exhibits a highly concealable leather-like appearance in which the internal structure such as fibers is difficult to see through on the surface, and when the light source is turned on, characters, figures, patterns, etc., on the surface of the leather-like colored resin layer are excellently visible.
- a leather-like light-emitting display device capable of light-emitting display with high contrast and leather-like appearance, concealability of an internal structure, and high-visibility light-emitting display. do.
- One aspect of the present invention is a leather-like sheet that is a laminate of a colored resin layer forming an outer surface layer and a fiber base material, a light-emitting portion disposed under the leather-like sheet, and a portion from the colored resin layer to the light-emitting portion.
- the luminance Yb of the light emitting display area corresponding to the portion excluding the light shielding portion is 100 to 2,000 cd/m 2
- the Yb/Ya is 2.0 or more, showing a luminescence display, leather-like luminescence It is a display device. Note that the luminance indicates the brightness of light emitted per unit area (cd/m 2 ).
- the internal structure such as fibers exhibits a leather-like appearance that is difficult to see through on the surface, and when the light source is turned on, letters, figures, patterns, etc. can be excellently displayed on the surface of the colored resin layer of the leather-like sheet. It is possible to obtain a leather-like light-emitting display device capable of emitting light with high visibility and high contrast, and having a leather-like appearance, concealability of the internal structure, and high-visibility light-emitting display.
- the light-emitting display region has a light-emitting display region with a light-emitting portion turned off and a light-emitting display area having a lightness L * value of 5 or more and 15 or less, measured from the surface of the colored resin layer under the condition of using a D65 light source. is preferred.
- the luminance L * value of the light-emitting display region is within such a range, the leather-like light-emitting display device has a clearer contrast when lit, and has a concealing property to hide the internal structure and high visibility. It becomes easier to adjust so that both
- the colored resin layer has an average light transmittance of 15% or more in the entire visible light region with a wavelength of 380 to 780 nm, and an average light transmittance of 50% or more in the wavelength region of 680 to 780 nm.
- the contrast of the light-emitting display becomes clearer, and it becomes easier to adjust so as to have both concealing properties and high visibility.
- the average values of light transmittance are all arithmetic average values.
- the colored resin layer contains polyurethane and a first coloring agent dispersed in the polyurethane, and the average dispersed particle size of the first coloring agent is 400 nm or less.
- Mixing (compatibility) with polyurethane is preferable from the viewpoint that a colored resin layer that maintains high light transmittance even when colored in a dark color can be easily obtained.
- the light-shielding portion is a printed layer because it is easy to clearly form a light-shielding portion having excellent light-shielding properties that provides excellent contrast.
- the light-shielding portion contains carbon black, since the light-shielding portion exhibits a high light-shielding property, thereby easily obtaining a higher contrast.
- the fiber base material is a fiber structure containing fibers having an average fiber diameter of 1.0 to 10.0 ⁇ m, since higher contrast can be easily obtained.
- the light-emitting portion is a surface light-emitting device having a light emission intensity in the range of 500 to 40,000 cd/m 2 from the viewpoint that the brightness Ya and the brightness Yb can be easily adjusted as described above.
- the internal structure such as fibers exhibits a highly concealable leather-like appearance that is difficult to see through on the surface, and when the light source is turned on, letters, figures, patterns, etc. are displayed on the surface of the colored resin layer of the leather-like sheet. It is possible to obtain a leather-like light-emitting display device capable of emitting light with excellent visibility and high contrast, and having a leather-like appearance, concealability of the internal structure, and high-visibility light-emitting display.
- FIG. 1 is a partially enlarged schematic cross-sectional view of a leather-like light-emitting display device 100 according to an embodiment.
- FIG. 2 is a schematic top view of the leather-like light-emitting display device 100 of the embodiment.
- FIG. 3 is a schematic top view of a light source module including a surface-mounted substrate 53 on which a large number of LED devices 52 are surface-mounted, housed in the surface-emitting light source 50 of the embodiment.
- FIG. 4 is a partially enlarged schematic cross-sectional view of a leather-like light-emitting display device 110 of another embodiment.
- FIG. 5 is a partially enlarged schematic cross-sectional view of a leather-like light-emitting display device 120 of another embodiment.
- FIG. 6 is a partially enlarged schematic cross-sectional view of a leather-like light-emitting display device 130 of another embodiment.
- FIG. 7 shows the light transmittance spectra of the colored resin sheets (colored resin layers) obtained in Example 5 and Comparative Example 6 in the visible light region with a wavelength of 380 to 780 nm.
- FIG. 1 shows a partially enlarged schematic cross-sectional view of a leather-like light-emitting display device 100, which is a representative example of the leather-like light-emitting display device of this embodiment.
- 2A and 2B are schematic top views of the leather-like light-emitting display device 100, in which FIG. 2A shows the state when the light-emitting portion is turned off, and FIG. FIG.
- FIG 3 is a schematic top view of a light source module including a surface-mounted substrate 53 on which a large number of LED devices 52 are surface-mounted and housed in a surface-emitting light source 50, which is a light-emitting portion of the embodiment.
- 1 is a colored resin layer forming an outer surface layer
- 2 is a fiber base material
- 10 is a leather-like sheet that is a laminate of the colored resin layer 1 and the fiber base material 2.
- Reference numeral 50 denotes a surface emitting light source (light emitting unit) that emits light from a large number of LED devices 52 to illuminate the surface.
- Reference numeral 3 denotes a light shielding portion interposed in any layer between the colored resin layer 1 and the surface emitting light source 50 for partially restricting light transmission.
- the surface-emitting light source 50 includes a housing (not shown), a light source module including a surface-mounted substrate 53 on which a large number of LED devices 52 housed in the housing are surface-mounted, and a light-transmitting illumination cover 51 covering the light source module. , provided.
- the LED device 52 includes a blue LED device including a blue LED chip, a white LED device that combines a blue LED chip and a phosphor to emit white or incandescent light, a green LED device including only a green LED chip, and a red LED chip only. including a red LED device, a near-ultraviolet LED device that emits light by combining a near-ultraviolet LED chip and a phosphor, and an LED chip that emits red, green, or blue light. It can be used without particular limitation, such as a full-color LED device that changes the emission color by changing the light intensity of each color and changing the mixing ratio of the three colors.
- the light emitting unit may be a light emitting unit including a HID lamp (High Intensity Discharge lamp), a fluorescent lamp, a halogen lamp, an incandescent lamp, etc. as a light source instead of the LED device.
- a HID lamp High Intensity Discharge lamp
- the illumination cover 51 is a light-transmissive molded body molded into a shape according to the application.
- the lighting cover 51 has a textured shape, contains inorganic particles such as silica, and organic or inorganic pigments that serve as color filters on the light emitting surface, thereby diffusing the light emitted from the numerous LED devices 52, which are point light sources. It is preferably formed so as to emit surface light with uniform luminance.
- the type of transparent resin that is the main component used in the light-transmitting molded body is not particularly limited, but examples include acrylic resins, methacrylic resins, ABS resins, polyolefin resins, polycarbonate resins, silicone resins, and the like. is mentioned.
- the light-transmitting molded article includes transparent, translucent, and colored transparent molded articles.
- the average light transmittance of the light emitting surface of the lighting cover in the entire region of the visible light region with a wavelength of 380 to 780 nm is 5% or more, further 50% or more, particularly 85% or more, particularly 95% or more.
- a wavelength of 380 to 780 nm is 5% or more, further 50% or more, particularly 85% or more, particularly 95% or more.
- the surface emitting light source 50 includes multiple LED devices 52 and a surface mount substrate 53 on which the multiple LED devices 52 are mounted.
- the number of LED devices 52 mounted on the surface mount substrate 53 is appropriately selected according to the light emission intensity of each LED device and the brightness of the intended leather-like light-emitting display device so that the brightness can be adjusted as described later. be.
- the surface emitting light source 50 causes the light emitting surface of the lighting cover 51 to emit surface light.
- a current control unit such as an LED driver (not shown) is mounted on the surface mount board 53, for example.
- the LED driver a known LED driver having a constant current circuit for controlling the current value supplied to each LED device 52, a PWM control circuit for controlling brightness by pulse control, or the like is used without particular limitation.
- the type of such LED driver is appropriately selected according to the desired brightness of the leather-like light-emitting display device.
- the luminance Ya of the non-light-emitting display area corresponding to the light-shielding portion is 200 cd/m 2 or less, and the luminance of the light-emitting display region corresponding to the light-transmitting portion excluding the light-shielding portion.
- Yb is 100 to 2,000 cd/m 2 and Yb/Ya is not particularly limited as long as a leather-like light-emitting display device can be realized.
- the emission intensity of the surface emitting light source is, for example, in the range of 500 to 40,000 cd/m 2 because it is easy to adjust the luminance Ya and the luminance Yb as described above. Further, the surface emitting light source may have a function of adjusting the luminance as long as the above-mentioned relation of luminance can be obtained.
- the leather-like light-emitting display device 100 is formed by bonding the fiber base material 2 of the leather-like sheet 10 to the light-emitting surface of the illumination cover 51 of the surface-emitting light source 50 via the adhesive layer 60 . It is A light blocking portion 3 that partially restricts light transmission is interposed in any layer between the colored resin layer 1 and the surface emitting light source 50 .
- the light shielding part 3 is formed on the fiber base material 2 by printing characters, figures, patterns, etc. corresponding to the light emitting display area in white with ink containing a pigment such as a black pigment. Formation of the light shielding part is not limited to printing on such a fiber base material.
- the light shielding portion may be formed by bonding a transparent resin sheet printed with the light shielding portion to the fiber base material or the light emitting surface of the light emitting portion.
- the light shielding portion may be printed directly on the light emitting surface.
- the light-shielding portion may be formed by transferring a seal, without being limited to printing. In the case of forming the light-shielding portion by printing, it is particularly preferable from the viewpoint of excellent productivity because it is easy to clearly form the light-shielding portion that provides high contrast and the design can be easily changed.
- Screen printing, gravure printing, inkjet printing, and the like are examples of printing methods used for printing the light-shielding portion.
- screen printing is preferable from the viewpoint of being excellent in printing mass productivity because the light shielding portion can be stably formed at a relatively low cost.
- pigment inks containing highly concealing pigments such as carbon black and titanium oxide and binders such as acrylic resins
- dye inks containing dark dyes are used. It is preferable that the light-shielding portion contains carbon black because the dispersed particle diameter is large, thereby exhibiting high light-shielding properties and providing excellent contrast.
- the light shielding portion formed in this way is not particularly limited as long as a leather-like light-emitting display device exhibiting luminance Ya and luminance Yb as described above can be obtained.
- the film preferably has an average light transmittance of 0.05% or less, more preferably 0.02% or less.
- the thickness of the light shielding portion is not particularly limited, but it is preferably about 5 to 80 ⁇ m, more preferably about 20 to 50 ⁇ m.
- FIG. 4 is a partially enlarged schematic cross-sectional view of a leather-like light-emitting display device 110 of another embodiment.
- the light-shielding portion 3 is printed on the light-emitting surface of the lighting cover 51 that constitutes the surface-emitting light source 50 .
- FIG. 5 is a partially enlarged schematic cross-sectional view of a leather-like light-emitting display device 120 of still another embodiment.
- the light shielding portion 3 is formed by printing on one surface of the transparent resin layer (transparent resin sheet) 40 .
- the transparent resin layer 40 on which the light shielding portion 3 is printed is adhered to the fiber base material 2 via the adhesive layer 60 and to the light emitting surface of the lighting cover 51 via the adhesive layer 61 .
- the transparent resin layer 40 may have light diffusing properties.
- FIG. 6 is a partially enlarged schematic cross-sectional view of a leather-like light-emitting display device 130 of still another embodiment.
- leather-like light-emitting display device 130 includes leather-like sheet 10 similar to leather-like light-emitting display device 100 .
- the leather-like sheet 10 includes a light-shielding portion 3 in which characters, figures, patterns, etc. corresponding to the light-emitting display area are partially printed on the fiber base material 2 in white.
- the leather-like light-emitting display device 130 was manufactured using such a leather-like sheet 10 by in-mold decoration molding using injection molding as described below.
- the surface resin layer 1 is arranged to face the cavity surface of the mold, and the leather-like sheet 10 printed with the light shielding part 3 is accommodated in the mold for injection molding. Then, the mold for injection molding that has been clamped is filled with a molten resin of a light-transmissive resin, and the light-transmissive resin is laminated and integrated with the leather-like sheet 10 in which the light-shielding portion 3 is formed by cooling. Mold a resin molding. In this way, a light-transmitting leather-like cover 70 is manufactured in which the leather-like sheet 10 including the light-shielding portion 3 is laminated and integrated with the transparent resin layer (light-transmitting resin molding) 65 as shown in FIG. be.
- the leather-like light-emitting display device 130 is obtained by fixing the light-transmissive leather-like cover 70 to the surface of the lighting cover 51 constituting the surface-emitting light source 50 by means of an adhesive, a clamp, a screw, or the like.
- a transparent resin layer 65 may also have light diffusion properties.
- FIG. 2 is a schematic top view of the leather-like light-emitting display device 100.
- FIG. 2A shows an image when the surface emitting light source 50 is turned off
- FIG. 2B shows an image when the surface emitting light source 50 is turned on.
- the leather-like light-emitting display device 100 includes a light-emitting display region L, which is an unprinted region having outlines of numbers 1 to 5, and outlines of numbers 1 to 5 are printed in white. and a non-luminous display region NL corresponding to the light shielding portion 3 formed on the display panel.
- the luminance Ya of the non-light-emitting display region NL corresponding to the light-shielding portion 3 is 200 cd/m 2 or less
- the luminance Yb of the light-emitting display region L corresponding to the portion other than the light-shielding portion 3 is It is a leather-like light-emitting display device that exhibits light-emitting display and is adjusted so that Yb/Ya is 100 to 2,000 cd/m 2 and is 2.0 or more.
- the internal structure of the fiber or the like exhibits a highly concealable leather-like appearance that is difficult to see through on the surface, and when the light source is turned on, letters and text appear on the surface of the colored resin layer of the leather-like sheet. It is possible to obtain a leather-like light-emitting display device capable of displaying figures, patterns, etc., with high contrast and emitting light, and having both a leather-like appearance and high visibility.
- luminance Ya is adjusted to 200 cd/m 2 or less, luminance Yb is 100 to 2,000 cd/m 2 , and Yb/Ya is adjusted to 2.0 or more.
- the brightness Ya is 150 cd/m 2 or less, the brightness Yb is 200 to 1500 cd/m 2 , and Yb/Ya is adjusted to 2.5 or more, and more preferably,
- the brightness Ya is adjusted to 120 cd/m 2 or less, the brightness Yb is 140 to 450 cd/m 2 , and Yb/Ya is adjusted to 3.0 or more.
- the internal structure is likely to be seen through the surface when the light is turned off.
- the luminance Yb of the light-emitting display area is less than 100 cd/m 2 , the luminance of the light-emitting display area becomes too low, making it difficult to see characters, figures, and patterns, especially fine patterns. , the visibility decreases when the ambient illumination is high.
- the luminance Yb of the light-emitting display area exceeds 2,000 cd/m 2 , the luminance is too high, and fine patterns become blurred and difficult to see.
- the light-emitting display region has a light-emitting display region with a light-emitting portion turned off and a light-emitting display area having a lightness L * value of 5 or more and 15 or less, measured from the surface of the colored resin layer under the condition of using a D65 light source. is preferred.
- the brightness L * value of the light-emitting display area is in such a range, the contrast when lit becomes clearer, and a light-emitting display that conceals the internal structure and is excellent in visibility can be obtained. easier to adjust.
- the leather-like sheet used in this embodiment includes a fiber base material and a colored resin layer that forms an outer surface layer laminated on the fiber base material.
- the colored resin layer is a layer that forms an outer surface layer in which a coloring agent is dispersed in a light-transmitting resin, and is adjusted so as to transmit light emission when lit and to hide the internal structure from the surface of the leather-like light-emitting display device. layer.
- the resin that is the main component of the colored resin layer is not particularly limited as long as it is a light-transmitting resin having sufficient light-transmitting properties. % or more, and more preferably 70% or more.
- Specific examples of such light-transmitting resins include, for example, polyurethane, acrylic elastic, silicone elastic, polyamide elastic, polyester elastic, polystyrene elastic, and polyolefin elastic. Those used in the production of grain-finished leather-like sheets are preferably used.
- polyurethane is particularly preferable because it is easy to obtain a leather-like sheet having an excellent balance between light transmittance and leather-like tactile feel.
- polyurethane examples include polycarbonate-based polyurethane, polyether-based polyurethane, polyester-based polyurethane, polycarbonate/polyether-based polyurethane, polyester/polyether-based polyurethane, and the like.
- polycarbonate-based polyurethanes are particularly preferred because of their excellent durability and heat resistance.
- pigments and dyes with excellent dispersibility, particularly pigments and dyes that increase the transmittance of light in the range of 680 to 780 nm.
- pigments and dyes include reactive special pigments such as Milliken's Vivitint and Reactint, which have a polymer segment such as polyol attached to the chromophore and have a reactive functional group at the end of the segment; dispersion type perylene black and aniline black; organic pigments such as Pigment Yellow 73 and Pigment Red 5; polymerizable dyes into which a reactive polymerizable group is introduced; disperse dyes;
- reactive special pigments such as Vivitint and Reactint, in which a polymer segment such as polyol is bound to a chromophore, are particularly preferable.
- the polymer segment in the reactive special pigment contributes to improving compatibility with the colored resin layer.
- the resin that is the main component of the colored resin layer is polyurethane and the polymer segment is polyol
- the polymeric polyol unit, which is the soft segment of polyurethane, and the polymer segment, which is polyol exhibit good compatibility.
- the dispersibility in the colored resin layer is particularly improved.
- the dispersibility of the colored pigment can be further improved.
- the type of coloring pigment, the state of dispersion, and the surface emission intensity of the surface emission light source by adjusting the type of coloring pigment, the state of dispersion, and the surface emission intensity of the surface emission light source, the light emitted from the surface of the leather-like light emission display device can be sufficiently transmitted while the light emitted from the light emitting section is turned on. Adjust so that the internal structure of is highly concealable and has a leather-like appearance.
- the average dispersed particle size of the colorant is preferably 400 nm or less, more preferably 300 nm or less. It is preferable that they are mixed (compatible). When the average dispersed particle size of the colorant is too large, the particles of the colorant tend to scatter or reflect light with a long wavelength, and the average visible light transmittance in the red region with a wavelength of 680 to 780 nm as described later. It becomes difficult to maintain the value above 50%.
- the colored resin layer or the colored resin sheet for forming the colored resin layer a dark color or deep color in which the lightness L * value of the light emitting display region is 5 or more and 15 or less, or a lightness L * value of more than 15 is used.
- a moderately dark color of 35 or less is preferable because the contrast at the time of lighting becomes clearer and it is easy to adjust so as to easily obtain a light-emitting display with excellent concealability and visibility.
- the wavelength 680 when using a dark colored resin sheet with a lightness L * value of 5 or more and 15 or less, or a medium dark colored resin sheet with a lightness L * value of more than 15 and 35 or less, the wavelength 680
- the average value of visible light transmittance in the red region of ⁇ 780 nm is preferably 50% or more, more preferably 55 to 65%.
- the average value of the visible light transmittance in the red region with a wavelength of 680 to 780 nm of the colored resin sheet is 50% or more, so that a large amount of light in the red region with a wavelength of 680 to 780 nm, which is difficult to brighten the emission color, is transmitted. , the average value of light transmittance in the entire visible light region can be kept high.
- the average value of light transmittance in the entire visible light region with a wavelength of 380 to 780 nm is 15% or more. is preferably 15 to 26%.
- the colored resin sheet used in Example 3 described later which contains 10% by mass of VIVITINT BLACK856, has a lightness L * value of 7.9
- the colored resin sheet is a deep black colored resin sheet having an average light transmittance of 20.5% in the entire region.
- the colored resin sheet used in Comparative Example 3 described later which contains 2.0% by mass of carbon black shown in FIG.
- the dark colored resin sheet has an average light transmittance of 4.8% in the entire region.
- the average value of light transmittance in the entire visible light region with a wavelength of 380 to 780 nm is 25% or more, or even 25 to 35% is preferred.
- the colored resin sheet obtained in Example 4 described later which contains 5% by mass of dispersion type perylene black, has a lightness L * value of 23.7, and has a wavelength of 380 to 780 nm in the entire visible light region.
- the thickness of the colored resin layer or the colored resin sheet for forming the colored resin layer and the content of the colorant are adjusted according to the desired surface lightness L * value of the colored resin layer.
- the thickness of the colored resin layer and the content of the colorant is 30 to 90 ⁇ m, and the content of the colorant is 1 to 20 parts by mass with respect to 100 parts by mass of the resin.
- the colored resin layer may have a single-layer structure made of a resin composition with a uniform formulation, or may have a laminated structure made up of a plurality of layers made of resin compositions with different formulations.
- the fiber base material is not particularly limited, it is preferably a nonwoven fabric. Since the directions of the entangled fibers of the nonwoven fabric are random, the pattern of the fibers is difficult to see when light is transmitted through the nonwoven fabric, and thus the luminance uniformity of the luminescent display is excellent. On the other hand, if the fibers of the fiber base material are oriented in a specific direction, such as a knitted fabric or a woven fabric, the fiber structure is projected on the transmitted light when the light is transmitted, and the uniformity of the luminance of the light emitting display is reduced. Tend.
- thermoplastic resin having optical transparency is preferably used as the resin forming the fibers of the fiber base material.
- thermoplastic resins include, for example, polyester resins such as polyethylene terephthalate (PET), modified polyester resins such as modified PET obtained by copolymerizing these with trace monomer units; polyamide resins such as polyamide 66. various acrylic resins; and thermoplastic resins having fiber-forming properties such as olefin resins such as polyethylene and polypropylene. These may be used alone or in combination of two or more.
- the fiber form such as the fiber diameter, cross-sectional shape, and fiber length of the fiber forming the fiber base material is appropriately selected.
- the average fiber diameter is obtained by taking a scanning electron microscope (SEM) photograph of the cross section of the leather-like sheet at a magnification of 3000, randomly selecting 10 fiber cross sections, measuring the fiber diameter, and measuring the average fiber diameter. can be calculated from SEM
- additives specifically, anti-coloring agents, heat-resistant agents, flame retardants, lubricants, anti-fouling agents, may be added to the resin used in the production of the fiber base material, as long as the objects and effects of the present invention are not impaired.
- fluorescent brightening agents, matting agents, gloss improving agents, antistatic agents, fragrances, deodorants, catalysts, antibacterial agents, anti-mite agents, inorganic particles and the like may be blended as necessary.
- the resin used in the production of the nonwoven fabric is preferably uncolored or white fibers that do not substantially contain a coloring agent that colors the fibers, from the viewpoint of easily obtaining a leather-like sheet having high light transmittance.
- uncolored or white fibers mean fibers in which coloring agents such as coloring pigments and dyes are not mixed with raw materials before spinning.
- the fiber base material preferably contains an elastic polymer, preferably a light-transmitting, non-colored polymer elastic body in its internal voids.
- polymeric elastomers include polyurethane elastomers, acrylic elastomers, polyamide elastomers, polyester elastomers, polystyrene elastomers, and polyolefin elastomers.
- the polyurethane-based elastic body and the acrylic-based elastic body, and particularly the combination of the polyurethane-based elastic body and the acrylic-based elastic body are preferable from the viewpoint of excellent balance between light transmittance and mechanical properties.
- the polymeric elastic body is preferably a non-foamed body in order to maintain high light transmittance.
- the fiber base material is an entangled nonwoven fabric of ultrafine fibers composed of island components obtained by removing the sea component from the sea-island composite fiber entangled sheet, the fiber bundle formed by removing the sea component
- the interface between the ultrafine fiber and the air is replaced with the interface between the ultrafine fiber and the elastic polymer, thereby reducing the difference in refractive index and further improving the light transmittance. It is preferable from the point that it can be made.
- the content of the elastic polymer in the fibrous base material is preferably 1 to 50% by mass, more preferably 5 to 30% by mass.
- the porosity in the fiber base material is 70% by volume or less, further 60% by volume or less, and particularly 50% by volume or less, to achieve high translucency. It is preferable from the point of exhibiting.
- the thickness of the fiber base material is preferably 0.1 to 1.0 mm, more preferably 0.2 to 0.6 mm, from the viewpoint of easily obtaining a leather-like sheet with high light transmittance.
- a leather-like sheet is manufactured, for example, as follows. First, after forming a colored resin sheet to be a colored resin layer on a supporting base material such as release paper, an adhesive layer is formed on the surface of the colored resin sheet, the adhesive layer is attached to the fiber base material, and pressed if necessary. and glue. Then, a leather-like sheet is obtained by peeling off the release paper from the colored resin layer.
- a two-liquid curing type polyurethane resin adhesive, a hot-melt type polyurethane resin adhesive, etc. which have conventionally been used as adhesives in the production of leather-like sheets, are preferably used. .
- the thickness of the adhesive layer is not particularly limited, but is preferably 10 to 300 ⁇ m, for example.
- the amount of the adhesive is not limited, it is preferably an amount such that the basis weight after adhesion is about 50 to 100 g/m 2 .
- the thickness of the leather-like sheet thus obtained is not particularly limited, it is preferably, for example, about 0.02 to 10 mm, more preferably about 0.05 to 5 mm, from the viewpoint of sufficiently maintaining light transmittance.
- the leather-like sheet preferably has an apparent density of 0.03 to 1.5 g/cm 3 , more preferably 0.06 to 1.2 g/cm 3 .
- the leather-like sheet preferably has an average light transmittance of 2% or more, more preferably 2 to 20%, particularly 2 to 10%, in the entire visible light region with a wavelength of 380 to 780 nm. If the average value of the light transmittance in the entire visible light region with a wavelength of 380 to 780 nm is less than 2%, the light transmittance is low, so letters, figures, and patterns are formed by light on the surface of the colored resin layer. It tends to be difficult to display clearly.
- the lightness L * value of the surface of the leather-like sheet in the L * a * b * color system is preferably 40 or less, more preferably 25 or less.
- the leather-like sheet of the present embodiment preferably has an average light transmittance of 5% or more, more preferably 7 to 15%, in the red region with a wavelength of 680 to 780 nm.
- the average value of light transmittance in the red region with a wavelength of 680 to 780 nm of the leather-like sheet is 5% or more, so that a large amount of light in the red region, which is difficult to brighten the emission color, is transmitted, and the surface brightness L * Average light transmittance in the entire visible light region with a wavelength of 380 to 780 nm, even for dark colors with a value of 15 or less, or medium dark colors with a lightness L * value of more than 15 and 35 or less. It becomes easy to maintain light transmittance such that the value is, for example, 2% or more.
- the surface of the leather-like sheet has a lightness L * value of 15 or less, or a lightness L * value of 15 or less and 5 or more, and the leather-like sheet has a wavelength of 380 to 780 nm in the entire visible light region.
- the average value of the light transmittance is particularly preferably 2% or more. In the case of such a leather-like sheet, it is preferable from the viewpoint that it is particularly excellent in the balance between the light transmittance in which transmitted light becomes clear and the hiding property in a dark color.
- Such a leather-like light-emitting display device is preferably used as a light-emitting display device used for home appliances, lighting equipment, OA equipment, instrument panels of vehicles, aircraft, ships, and the like.
- it is preferably used as a light-emitting display device that has a high-class feel due to its leather-like visual texture and texture, and that can realize a variety of designs including the surroundings.
- a leather-like sheet was embedded in epoxy resin. Then, the colored resin sheet of the leather-like sheet embedded in the epoxy resin was sliced in the cross-sectional direction by an ultramicrotome to prepare a test piece. Then, the test piece was photographed with a transmission electron microscope ("H-800NA type” manufactured by Hitachi, Ltd. (10,000 to 100,000 times magnification)), and the average particle diameter of the coloring agent particles in a 10 ⁇ m square field of view. was calculated. The average particle diameter was obtained by taking the distance of the longest part of the particles as the particle diameter and arithmetically averaging the particle diameters of the particles within the field of view.
- H-800NA type manufactured by Hitachi, Ltd. (10,000 to 100,000 times magnification)
- the average particle size obtained at 10 points was arithmetically averaged to obtain the average dispersed particle size of the colorant.
- A was assigned when the colorant was dissolved and the outline could not be identified
- B was assigned when the average dispersed particle size was less than 400 nm
- C was assigned when the average dispersed particle size was 400 nm or more.
- the light transmittance in the wavelength range of 380 to 780 nm of the film of the colored resin sheet peeled from the release paper was measured with a spectrophotometer (U-3010 Spectrophotometer manufactured by HITACHI). Then, the arithmetic average value of the light transmittance in the entire visible light region of 380 to 780 nm and the arithmetic average value of the light transmittance in the entire red region of 680 to 780 nm were obtained.
- FIG. 7 shows the spectrum showing the light transmittance of the colored sheets obtained in Example 3 and Comparative Example 3 in the visible light region with a wavelength of 380 to 780 nm.
- the light transmittance of the leather-like sheet in the wavelength region of 380 to 780 nm was measured with a spectrophotometer (U-3010 Spectrophotometer manufactured by HITACHI). Then, the arithmetic average value of the light transmittance in the entire visible light region of 380 to 780 nm and the arithmetic average value of the light transmittance in the entire red region of 680 to 780 nm were obtained.
- the chromaticity of the surface of the colored resin sheet or the surface of the colored resin layer of the leather-like sheet was measured using a spectrophotometer (CM-3610d, Konica Minolta, D65 light source). Specifically, a standard white plate (aluminum oxide plate) was placed on the surface opposite to the surface of the colored resin sheet or leather-like sheet, set in a spectrophotometer, and colorimetrically measured. The lightness L * value in the L * a * b * color system was determined from the colorimetric values.
- CM-3610d Konica Minolta, D65 light source
- the thickness (mm) and basis weight (g/cm 2 ) were measured according to JIS L 1913, and the apparent density (g/cm 3 ) was calculated from these values.
- the average fiber diameter was measured by taking a scanning electron microscope (SEM) photograph of a cross section in the thickness direction of the leather-like sheet at a magnification of 3000, and randomly selecting 10 fiber cross sections to measure the fiber diameter.
- the diameter of the fiber is defined as the diameter of the circumscribed circle of the cross section of the selected fiber.
- the average value of the obtained 10 fiber diameters was calculated as the average fiber diameter.
- Example 1 Manufacture of leather-like seats
- a water-soluble thermoplastic polyvinyl alcohol resin was used as the sea component
- PET having a degree of modification with isophthalic acid of 6 mol % was used as the island component.
- a sea-island type filament was extruded from the spinneret at 260° C. using a melt composite spinning spinneret having 25 islands per fiber and a sea component/island component ratio of 25/75 (mass ratio). . Then, the pressure of the ejector was adjusted so that the spinning speed was 3700 m/min, and sea-island type conjugate long fibers with an average fineness of 2.1 dtex were collected on the net.
- the islands-in-the-sea composite long fibers collected on the net were lightly pressed with a metal roll having a surface temperature of 42° C. to suppress fluffing on the surface and peeled from the net. Then, the sheet separated from the net is passed between a checkered metal roll and a back roll having a surface temperature of 75° C. and hot-pressed .
- the obtained filament web was cross-wrapped to stack 8 sheets, and a needle breakage preventing oil was sprayed on this. Then, using a 6-barb needle with a distance from the tip of the needle to the barb of 3.2 mm, needle punching was performed alternately from both sides at a needle depth of 8.3 mm at a punch density of 3300 punch/cm 2 to obtain a basis weight of 320 g/m 2 . of entangled filament webs was obtained.
- the long fiber web was thermally shrunk by being immersed in hot water at 70°C for 14 seconds at a winding line speed of 10 m/min to obtain a densified entangled web.
- the densified entangled web was then impregnated with polyurethane as follows.
- a polyurethane emulsion (30% solids concentration) based on polycarbonate/ether polyurethane was impregnated into the densified entangled web. Then, it was dried in a drying oven at 150°C.
- the polyurethane-impregnated entangled web thus obtained was repeatedly dip-nipped in hot water at 95° C. to dissolve and remove the modified PVA, thereby containing 25 ultrafine long fibers with an average fineness of 0.1 dtex.
- a nonwoven fabric of ultrafine fibers in which the fiber bundles were three-dimensionally entangled was obtained.
- the nonwoven fabric was sliced and buffed to prepare a nonwoven fabric base material of superfine fibers having an apparent density of 0.50 g/cm 3 , a thickness of 0.35 mm, and an average fiber diameter of 3.0 ⁇ m.
- the nonwoven fabric substrate was impregnated with an acrylic elastic emulsion (RYUDYE-WBINDER 11KS-EN manufactured by DIC Corporation, solid content 30% by mass) at a pick-up rate of 100%.
- the fiber base material was obtained by drying for 10 minutes with a 100 degreeC dryer.
- the porosity of the fiber base material was 44%.
- a resin liquid for forming a colored resin layer was prepared by dispersing a black pigment (VIVITINT BLACK856, manufactured by Milliken) in a 30% by mass polyurethane DMF solution containing a non-yellowing polycarbonate-based polyurethane.
- the resin liquid contained 7.5% by mass of a black pigment based on the solid content of the non-yellowing polycarbonate-based polyurethane.
- After coating the prepared resin liquid on a release paper it was dried at 120° C. for 2 minutes to form a black colored resin sheet with a thickness of 60 ⁇ m. The resulting colored resin sheet was peeled off from the release paper.
- the resin liquid for forming the adhesive layer was a 30% by weight DMF solution of polycarbonate-based polyurethane.
- the adhesive layer on the release paper thus formed was placed in contact with one surface of the fiber base material, and pressed with a heating roll whose surface temperature was set to 75°C. After aging at 50° C. for 3 days, the release paper was peeled off to obtain a leather-like sheet having a black colored resin layer.
- the leather-like sheet thus obtained had a thickness of 0.31 mm, an apparent density of 1.07 g/cm 3 and a basis weight of 333 g/m 2 .
- a 40 pt (14.11 mm) size font of numbers 1 to 9 that will be the translucent part is outlined.
- a light-shielding portion was formed by screen printing with black ink using a screen plate. The film thickness of the formed light shielding portion was about 20 ⁇ m.
- a leather-like sheet with a light-shielding portion formed in a square area of 100 mm x 100 mm is set in the mold of an injection molding machine, and a transparent polycarbonate resin is injection-molded to a thickness of 1 mm on the same side as the light-shielding portion.
- a light-transmitting leather-like cover having a light-shielding portion was obtained.
- a surface emitting light source a surface emitting light source containing a large number of white LED devices having a square light emitting surface of 100 mm ⁇ 100 mm was prepared.
- This surface emitting light source has an adjusting range of luminance of the emitting surface of 0 to 40,000 cd/m 2 .
- Luminance L * value of light emitting region From the surface of the colored resin sheet of the leather-like light-emitting display device, the chromaticity of the light-emitting region was measured using a spectrophotometer (CM-25cG, manufactured by Konica Minolta). Specifically, with the surface emitting light source turned off, the color of the surface of the colored resin sheet in the portion corresponding to the light emitting display portion was measured to obtain the lightness L * value with the D65 light source.
- the light-emitting surface of the surface-emitting light source of the leather-like light-emitting display device was made to emit light.
- the white printed numbers are raised in the light emitting display region which is the translucent portion corresponding to the portion of the surface of the leather-like light emitting display device excluding the light shielding portion.
- luminous display In the state of emitting light, a spectroradiometer (two-dimensional type spectroradiometer SR-5000HS manufactured by Topcon Technohouse Co., Ltd.) is used in a dark room from a distance of 70 cm perpendicular to the light emitting surface. was measured.
- the average values of the brightness data for each pixel were calculated for the non-light-emitting display region corresponding to the light-shielding portion and the light-emitting display region corresponding to the light-transmitting portion, and the brightness Ya and the brightness Yb were obtained, respectively.
- Example 2 A leather-like sheet and a leather-like light-emitting display device were manufactured and evaluated in the same manner as in Example 1, except that the luminance of the surface-emitting light source was changed as shown in Table 1. Table 1 shows the results.
- Example 3 A leather-like sheet and a leather-like light-emitting display device were produced and evaluated in the same manner as in Example 1, except that the mixing ratio of the coloring agent in the colored resin sheet was changed as shown in Table 1. Table 1 shows the results.
- Example 4 A leather-like sheet and a leather-like light-emitting display device were produced and evaluated in the same manner as in Example 1, except that VIVITINT BLACK856 was changed to dispersion type perylene black. Table 1 shows the results.
- Example 5 A leather-like sheet and a leather-like light-emitting display device were manufactured and evaluated in the same manner as in Example 1, except that the luminance of the surface-emitting light source was changed as shown in Table 1. Table 1 shows the results.
- Example 1 A leather-like sheet and a leather-like light-emitting display device were produced and evaluated in the same manner as in Example 1, except that the fiber base material was changed from the PET nonwoven fabric to the PET knitted fabric. Table 1 shows the results.
- Example 2 A leather-like sheet was produced and evaluated in the same manner as in Example 1, except that the average fiber diameter of the fibers constituting the PET nonwoven fabric of the fiber base material was changed from 3.0 ⁇ m to 13.6 ⁇ m. Table 1 shows the results.
- a resin liquid for forming a colored resin sheet is prepared by dispersing a black pigment (carbon black, Dilac L-1770, manufactured by DIC Corporation) in a 30% by mass polyurethane DMF solution containing non-yellowing polycarbonate polyurethane. bottom.
- the resin liquid contained 2.0% by mass of carbon black based on the solid content of the non-yellowing polycarbonate-based polyurethane.
- a colored resin sheet having a thickness of 60 ⁇ m was formed in the same manner as in Example 1, and a leather-like sheet and a leather-like light-emitting display device were produced and evaluated in the same manner as in Example 1. Table 1 shows the results.
- Example 4 A leather-like sheet and a leather-like light-emitting display device were produced and evaluated in the same manner as in Example 1, except that the leather-like sheet was changed to only the colored resin sheet. Table 1 shows the results.
- the luminance Ya of the non-luminous display area is 200 cd/m 2 or less
- the luminance Yb of the luminous display area is 100 to 2,000 cd/m 2
- Yb/Ya is 2.0 or more. All of the leather-like light-emitting display devices obtained in Examples 1 to 5, which exhibited light-emitting display, were judged as A in the visibility evaluation.
- Comparative Examples 1 and 2 in which the luminance Ya of the non-light-emitting display region exceeded 200 cd/m 2 , were judged as B.
- the luminance Ya of the non-luminous display area is 200 cd/m 2 or less, and the luminance Yb of the luminous display area is 100 to 2,000 cd/m 2 .
- the leather-like light-emitting display device obtained in Comparative Example 3 was evaluated as C. Further, the luminance Ya of the non-luminous display region exceeds 200 cd/m 2 and the luminance Yb of the luminous display region exceeds 2,000 cd/m 2 , but Yb/Ya is 2.0 or more.
- the luminance Ya of the non-luminous display area is 200 cd/m 2 or less
- the luminance Yb of the luminous display area is 100 to 2,000 cd/m 2
- Yb/Ya is 2.0.
- the judgment of B was also given to the leather-like light-emitting display device obtained in Comparative Example 5, which exhibited the light-emitting display described above.
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Abstract
Description
エポキシ樹脂に皮革調シートを埋包した。そして、エポキシ樹脂に埋包された皮革調シートの着色樹脂シートを断面方向に超ミクロトームでスライスして試験片を作成した。そして、試験片を透過型電子顕微鏡((株)日立製作所製「H-800NA型」(倍率1万~10万倍))で撮影し、10μm四方の視野にある着色剤の粒子の平均粒子径を算出した。なお、平均粒子径は、粒子の最も長い部分の距離を粒子径とし、視野内の粒子の粒子径を算術平均して平均粒子径とした。10ケ所で得られた平均粒子径を算術平均し、着色剤の平均分散粒子径とした。また、着色剤が溶解して輪郭を特定できない場合をA、平均分散粒子径が400nm未満の場合をB、平均分散粒子径が400nm以上の場合をCと判定した。
離型紙から剥離した着色樹脂シートの皮膜の波長域380~780nmの光透過率を、分光光度計(HITACHI製 U-3010 Spectrophotometer)で測定した。そして、波長域380~780nmの可視光領域の全領域における、光透過率の相加平均値、及び680~780nmの赤色領域の全領域における、光透過率の相加平均値を求めた。一例として、図7に、実施例3及び比較例3で得られた着色シートの波長380~780nmの可視光領域の光透過率を示すスペクトルを示す。
皮革調シートの波長域380~780nmの光透過率を、分光光度計(HITACHI製 U-3010 Spectrophotometer)で測定した。そして、波長域380~780nmの可視光領域の全領域における、光透過率の相加平均値、及び680~780nmの赤色領域の全領域における、光透過率の相加平均値を求めた。
着色樹脂シートの表面または皮革調シートの着色樹脂層の表面の色度を、分光測色計(CM-3610d、コニカミノルタ製、D65光源)を用いて測色した。具体的には、着色樹脂シートまたは皮革調シートの表面の反対側の面に標準白板(酸化アルミニウム板)を配して分光測色計にセットし、測色した。測色値からL*a*b*表色系における明度L*値を求めた。
JIS L 1913に準じて、厚さ(mm)および目付け(g/cm2)を測定し、これらの値から見掛け密度(g/cm3)を算出した。
平均繊維直径は、皮革調シートの厚さ方向の断面の走査型電子顕微鏡(SEM)写真を3000倍で撮影し、繊維の断面をランダムに10個選択して繊維直径を測定した。なお、繊維直径は選択した繊維断面の外接円の直径をその繊維の繊維直径とした。得られた10個の繊維直径の平均値を算出し、平均繊維直径とした。
皮革調シートの厚さ方向の断面の走査型電子顕微鏡(SEM)写真を300倍で撮影し、真の厚さ方向の厚さを測定し、繊維基材の目付および基材に使用した原料の密度より、以下の式により繊維基材の空隙率を算出した。
・繊維基材の空隙率(体積%)=(1-(目付/原料の密度)/(厚さ/真の厚さ))×100
(皮革調シートの製造)
水溶性熱可塑性ポリビニルアルコール樹脂を海成分とし、イソフタル酸変性度6モル%のPETを島成分とした。繊維1本あたりの島数が25島で、海成分/島成分が25/75(質量比)となるような溶融複合紡糸用口金を用いて、海島型のフィラメントを260℃の口金より吐出した。そして、紡糸速度が3700m/minとなるようにエジェクター圧力を調整し、平均繊度2.1dtexの海島型複合長繊維をネット上に捕集した。そしてネット上に捕集された海島型複合長繊維を表面温度42℃の金属ロールで軽く押さえることにより表面の毛羽立ちを抑えてネットから剥離した。そして、ネットから剥離されたシートを、表面温度75℃の格子柄の金属ロールとバックロールとの間を通過させて熱プレスすることにより、表面の極細繊維が仮融着した目付31g/m2の長繊維ウェブを得た。
得られた皮革調シートを用いて、以下のようにして、皮革調発光表示装置を製造し、評価した。
皮革調発光表示装置の着色樹脂シートの表面から、発光領域の色度を、分光測色計(CM-25cG、コニカミノルタ製)を用いて測色した。具体的には、面発光光源を消灯させた状態で、発光表示部に対応する部分の着色樹脂シートの表面を測色し、D65光源での明度L*値を求めた。
皮革調発光表示装置の面発光光源の発光面を発光させた。面発光光源を点灯させることにより、皮革調発光表示装置の表面の遮光部を除く部分に対応する透光部である発光表示領域において、白抜きにするように印刷された数字が浮きあがるように発光表示された。発光表示させた状態で、暗室内にて分光放射計((株)トプコンテクノハウス製の二次元タイプ分光放射計SR-5000HS)を用いて発光面に対し垂直に70cmの距離から、発光表示装置の発光面の輝度を測定した。そしてピクセル毎の輝度のデータを、遮光部に対応する非発光表示領域及び透光部に対応する発光表示領域のそれぞれで、平均値を算出し、それぞれ輝度Ya、輝度Ybとした。
視認性を自動車ユーザー10人に、以下の基準に基づいて判定させた。そして、多数決で判定を決定した。
A:面発光光源を点灯させたときに、発光表示領域の数字が非発光表示領域に対してコントラスト高く表示されており、全ての数字が一目で明瞭に認識された。また、消灯したときには、表面から内部の構造が透けて見えなかった。
B:面発光光源を点灯したときに、発光表示領域の数字が非発光表示領域に対してコントラスト高く表示されており、全ての数字が一目で明瞭に認識された。しかし、消灯したときには、表面から内部の構造が透けて見えた。
C:面発光光源を点灯したときに、発光表示領域の数字が非発光表示領域に対してコントラスト低く表示されており、数字が一目で明瞭に認識されにくい印象であった。一方、消灯したときには、表面から内部の構造が透けて見えなかった。
D:面発光光源を点灯させたときに、発光表示領域の数字が非発光表示領域に対してコントラスト高く表示されていたが、輝度が高すぎるため、細部が認識されにくい印象であった。また、消灯したときには、表面から内部の構造が透けて見えた。
面発光光源の輝度を表1に示したように変更した以外は、実施例1と同様にして皮革調シート及び皮革調発光表示装置を製造し、評価した。結果を表1に示す。
着色樹脂シート中の着色剤の配合割合を表1に示したように変更した以外は、実施例1と同様にして皮革調シート及び皮革調発光表示装置を製造し、評価した。結果を表1に示す。
VIVITINT BLACK856を分散タイプのペリレンブラックに変更した以外は、実施例1と同様にして皮革調シート及び皮革調発光表示装置を製造し、評価した。結果を表1に示す。
面発光光源の輝度を表1に示したように変更した以外は、実施例1と同様にして皮革調シート及び皮革調発光表示装置を製造し、評価した。結果を表1に示す。
繊維基材をPET不織布からPET編物に変更した以外は、実施例1と同様にして皮革調シート及び皮革調発光表示装置を製造し、評価した。結果を表1に示す。
繊維基材のPET不織布を構成する繊維の平均繊維直径を、3.0μmから13.6μmに変更した以外は、実施例1と同様にして皮革調シートを製造し、評価した。結果を表1に示す。
無黄変ポリカーボネート系ポリウレタンを含有する30質量%ポリウレタンDMF溶液に、黒色顔料(カーボンブラック、ダイラックL-1770、DIC(株)製)を分散させた着色樹脂シートを形成するための樹脂液を調製した。なお、樹脂液には無黄変ポリカーボネート系ポリウレタンの固形分に対して、カーボンブラック2.0質量%が配合されていた。以下、実施例1と同様にして、厚さ60μmの着色樹脂シートを形成し、また、実施例1と同様にして皮革調シート及び皮革調発光表示装置を製造し、評価した。結果を表1に示す。
皮革調シートを、着色樹脂シートのみに変更した以外は、実施例1と同様にして皮革調シート及び皮革調発光表示装置を製造し、評価した。結果を表1に示す。
面発光光源の輝度を表1に示したように変更した以外は、比較例4と同様にして皮革調シート及び皮革調発光表示装置を製造し、評価した。結果を表1に示す。
2 繊維基材
3 遮光部
10 皮革調シート
40 透明樹脂層
50 面発光光源
51 照明カバー
52 LED装置
53 表面実装基板
60,61 接着層
65 透明樹脂層
70 光透過性皮革調カバー
100,110,120 皮革調発光表示装置
L 発光表示領域
NL 非発光表示領域
Claims (10)
- 外表層を形成する着色樹脂層と繊維基材との積層体である皮革調シートと、前記皮革調シートの下層に配された発光部と、前記着色樹脂層から前記発光部までの間の何れかの層に介在する光透過を部分的に制限する遮光部と、を含み、
前記着色樹脂層の表面から測定された、前記遮光部に対応する非発光表示領域の輝度Yaが200cd/m2以下であり、前記遮光部を除く部分に対応する発光表示領域の輝度Ybが100~2,000cd/m2であり、Yb/Yaが2.0以上である、発光表示を示す皮革調発光表示装置。 - 前記発光部を消灯させた状態で、前記着色樹脂層の前記表面からD65光源を用いた条件で測定された、前記発光表示領域の明度L*値が5以上15以下である請求項1に記載の皮革調発光表示装置。
- 前記着色樹脂層は、波長380~780nmの可視光領域の全領域における、光透過率の平均値が15%以上であり、波長680~780nmの領域における、光透過率の平均値が50%以上である、請求項1または2に記載の皮革調発光表示装置。
- 前記着色樹脂層は、ポリウレタンと、前記ポリウレタンに分散された第1の着色剤とを含み、前記第1の着色剤の平均分散粒子径が400nm以下である、請求項2または3に記載の皮革調発光表示装置。
- 前記第1の着色剤が、分子レベルで前記ポリウレタンと混和している、請求項4に記載の皮革調発光表示装置。
- 前記第1の着色剤が、発色団にポリマーセグメントを結合させた顔料である請求項4または5に記載の皮革調発光表示装置。
- 前記遮光部は、印刷された層である、請求項1~6の何れか1項に記載の皮革調発光表示装置。
- 前記遮光部はカーボンブラックを含む、請求項1~7の何れか1項に記載の皮革調発光表示装置。
- 前記繊維基材は、平均繊維直径1.0~10.0μmの繊維を含む繊維構造体である、請求項1~8の何れか1項に記載の皮革調発光表示装置。
- 前記発光部は、500~40,000cd/m2の範囲の発光強度を有する面発光装置である、請求項1~9の何れか1項に記載の皮革調発光表示装置。
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