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Wavelength-selective absorption filter

A wavelength selection and filter technology, applied in the field of optical filters, can solve the problems of impairing the color reproducibility of the display and the clarity of the image, and achieve the effect of less changes, reduced changes over time, and high definition

Inactive Publication Date: 2009-06-03
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] In addition, since the plasma display also emits neon orange light (near a wavelength of 600nm), if only the stability of the near-infrared absorption layer is maintained over time, there is a risk of impairing the vivid color reproducibility or image clarity of the display. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0161] (Making of base material)

[0162] Put polyethylene terephthalate resin with an intrinsic viscosity of 0.62dl / g into a twin-screw extruder, melt and extrude it from a T-shaped die at 290°C, and place it on a cooling rotating metal roll under static electricity. At the same time, it was solidified in close contact to obtain an unstretched sheet.

[0163] Then, the unstretched sheet was heated to 90° C. with a roll stretcher and stretched longitudinally by a factor of 3.5, and the following coating solution A was applied to both sides of the longitudinally stretched film so that The coating weight after drying on the stretched film reaches 0.5g / m 2, and made it pass under the hot air of 120 degreeC of wind speed 10m / sec for 20 seconds, and formed the intermediate coating layer. Next, it was heated to 140°C in a tenter, stretched laterally by 3.7 times, and then heat-treated at 235°C while relaxing it by 5% in the width (transverse) direction to obtain an intermediate co...

Embodiment 2

[0194] A wavelength selective absorption filter was obtained in the same manner as in Example 1 except that the following coating solution C was used. Furthermore, the mass ratio of the aromatic diiminium-based dye (a) to the azaporphyrin-based dye (b) in the wavelength selective absorption layer is (a) / (b)=100 / 17.

[0195] (Preparation of Coating Liquid C for Wavelength Selective Absorbing Layer)

[0196] Toluene, cyclopentanone, and resin were mixed in the following mass ratio, stirred under heating, and after dissolving the resin, pigment and surfactant were added, and stirred for more than 30 minutes. Then, undissolved matter was removed with a filter having a nominal filtration accuracy of 1 μm, and a coating solution C was prepared.

[0197] ・Toluene 40.088% by mass

[0198] · Cyclohexanone 40.088% by mass

[0199] ・Copolyester resin with fluorene skeleton 18.776% by mass

[0200] (manufactured by Canebo, O-PET, Tg=150°C)

[0201] ・Aromatic diiminium pigment 0.695% ...

Embodiment 3

[0248] (Preparation of Coating Liquid F for Near Infrared Absorbing Layer in Wavelength Selective Absorbing Layer)

[0249] Toluene, methyl ethyl ketone, and resin were mixed in the following mass ratio, stirred under heating, and after dissolving the resin, pigment and surfactant were added, and stirred for more than 30 minutes. Then, undissolved matter was removed with a filter having a nominal filtration accuracy of 1 μm, and a coating solution F was prepared.

[0250] ・Toluene 40.056% by mass

[0251] ・Methyl ethyl ketone 40.057% by mass

[0252] ・Acrylic resin 18.776% by mass

[0253] (manufactured by Mitsubishi Rayon, BR-80, Tg=105°C)

[0254] ・Aromatic diiminium pigment 0.695% by mass

[0255] (manufactured by Carlit Japan, CIR1085, counter ion: bis(trifluoromethanesulfonyl)imidic acid)

[0256] ・Phthalocyanine pigment 0.357% by mass

[0257] (manufactured by Nippon Catalyst, IR-10A)

[0258] ・Silicone-based surfactant 0.059% by mass

[0259] (Manufactured by Do...

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Abstract

This invention provides a wavelength-selective absorption optical filter that exhibits high level and broad absorption in a near infrared region, further absorbs neon light, and exhibits high light transmittance in other visible light region. The wavelength-selective absorption optical filter is less likely to cause a change in optical properties with the elapse of time and is highly durable. The wavelength-selective absorption optical filter comprises a transparent base material and a wavelength-selective absorption layer having a single or multilayer structure stacked on the base material. The wavelength-selective absorption layer comprises a resin, an near infrared absorptive coloring matter (A) and a coloring matter (B), and the wavelength-selective absorption optical filter has maximum absorption at a wavelength of 800 to 1200 nm and a wavelength of 550 to 620 nm. The wavelength-selective absorption optical filter is characterized in that one type of the near infrared absorptive coloring matter (A) is an aromatic diimmonium coloring matter (a) of which the counter ion is bis(trifluoromethansulfonyl)imidic acid, and one type of the coloring matter (B) is a porphyrin coloring matter or azaporphyrin coloring matter (b).

Description

technical field [0001] The present invention relates to an optical filter that absorbs near-infrared rays and neon light, and specifically relates to a wavelength-selective absorption filter that has broad absorption in the near-infrared region and also absorbs neon light and other visible light The light transmittance in the area is high, and even when stored under high temperature and high humidity, there is little change in optical characteristics over time, and it is excellent in durability. Background technique [0002] An optical filter having near-infrared absorption ability has properties of blocking near-infrared rays and passing visible light, and is used in various applications. [0003] In recent years, plasma displays have attracted attention as thin and large-screen displays. However, there is a problem that electronic equipment using near-infrared remote control may malfunction due to near-infrared rays emitted from the plasma display. Near infrared absorptio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/22C09B47/00C09B55/00C09B67/22C09K3/00
CPCC09B53/02G02B5/223B32B27/08C09B47/00G02B1/04G02B5/208
Inventor 森宪一吉见晃尾道晋哉泽崎真治森重地加男
Owner TOYOBO CO LTD
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