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Optical filter

An optical filter and wavelength technology, which is applied in the field of optical filters, can solve the problems of decreased sensing accuracy and achieve the effects of suppressing the influence of vein lines, small position-dependent contrast changes, and small incident angle dependence

Active Publication Date: 2021-03-23
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, small positional differences have a greater impact on the contrast of the fingerprint image, and the accuracy of sensing may decrease.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0237] Hereinafter, although an Example demonstrates this invention, this invention is not limited at all by the said Example. In addition, "part" and "%" mean "part by mass" and "% by mass" unless otherwise indicated. In addition, the measurement method of each physical property value and the evaluation method of a physical property are as follows.

[0238]

[0239] The molecular weight of the resin is measured by the following method (a), (b) or (c) in consideration of the solubility of each resin in a solvent and the like.

[0240] (a) Gel Permeation Chromatography (GPC) device (150C type, column: H type column produced by Tosoh (Tosoh) Company, developing solvent: o-dichlorobenzene) manufactured by Waters (WATERS) Company, The weight average molecular weight (Mw) and the number average molecular weight (Mn) of standard polystyrene conversion were measured.

[0241] (b) Using a GPC device manufactured by Tosoh (HLC-8220 type, column: TSKgelα-M, developing solvent: tetrahy...

Synthetic example

[0262] Compound (A) used in the following Examples and Comparative Examples was synthesized by a generally known method. As a common synthesis method, for example, Japanese Patent No. 3366697, Japanese Patent No. 2846091, Japanese Patent No. 2864475, Japanese Patent No. 3703869, Japanese Patent Laid-Open No. 60-228448, Japanese Japanese Patent Laid-Open No. 1-146846, Japanese Patent Laid-Open No. 1-228960, Japanese Patent No. 4081149, Japanese Patent Laid-Open No. 63-124054, "Phthalocyanine-Chemistry and Function-" (IPC, 1997 2007-169315), Japanese Patent Laid-Open No. 2009-108267, Japanese Patent Laid-Open No. 2010-241873, Japanese Patent No. 3699464, Japanese Patent No. 4740631, etc. Methods.

Synthetic example 1

[0264] The 8-methyl-8-methoxycarbonyltetracyclo[4.4.0.1 represented by the following formula (2) 2,5 .1 7,10 ] 100 parts of dode-3-ene (hereinafter also referred to as "DNM"), 18 parts of 1-hexene (molecular weight modifier), and 300 parts of toluene (a solvent for ring-opening polymerization reaction) were charged to a nitrogen-substituted reaction vessel, and the solution was heated to 80 °C. Then, 0.2 parts of a toluene solution (0.6 mol / L) of triethylaluminum as a polymerization catalyst and a toluene solution (0.025 mol / L) of methanol-modified tungsten hexachloride were added to the solution in the reaction vessel 0.9 parts, and the solution was heated and stirred at 80° C. for 3 hours, thereby performing a ring-opening polymerization reaction to obtain a ring-opening polymer solution. The polymerization conversion rate in the polymerization reaction was 97%.

[0265] [chemical 7]

[0266]

[0267] 1,000 parts of the ring-opening polymer solution obtained in the ab...

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Abstract

The present invention addresses the problem of providing an optical filter with which both excellent visible light transmittance and near-infrared cutting performance can be achieved even if there isan increase in the incident angle. The optical filter according to the present invention includes a base material (i) including a resin layer, and a dielectric multilayer film provided on at least oneside of the base material (i), the optical filter being characterized by satisfying the condition (Yb)>= {(Ya) + 80} nm where (Ya) nm represents the shortest wavelength according to which a transmittance as measured in a direction perpendicular to the surface of the optical filter for a wavelength of 570 - 625 nm is 50%, and (Yb) nm represents a wavelength according to which a reflectance as measured at an angle of 5 degrees relative to a direction perpendicular to the surface of the optical filter for a wavelength of 600 - 1000 nm is 50%.

Description

technical field [0001] The invention relates to an optical filter. Background technique [0002] In recent years, in bank's automatic teller machine (Automated Teller Machine, ATM), mobile phone, smart phone (smartphone), tablet (tablet), personal computer (personal computer, PC), etc., in order to identify the user, use The necessity of personal authentication with biometric patterns such as fingerprints, veins, voiceprints, and irises of users has increased. Among them, fingerprint is the biometric authentication method with the longest history and practical achievements. Fingerprint authentication devices using total reflection prisms have been put into use, but the current situation is that it is difficult to miniaturize, so it is not suitable for mobile terminals such as notebook personal computers, mobile phones, smartphones, and tablets. In view of such a situation, various fingerprint authentication devices have been developed in which thinness and miniaturization ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/20G02B5/22G02B5/26G02B5/28
CPCG02B5/20G02B5/26G02B5/28G02B5/22G02B5/201G02B5/223G02B1/04
Inventor 长屋胜也重冈大介
Owner JSR CORPORATIOON