Patent ID: 7622167
Filing Date: 2009-11-24
Classification: C09K,G02B

Abstract:
1. A polarizer composed of a film comprising a structure in which fine metallic particles is dispersed in a polymer matrix, wherein a polymer forming the polymer matrix is a translucent polymer having a light transmittance of 88% or more when measured thereof with a thickness of 1 mm and the film is uniaxially stretched, a domain formed with fine metallic particles has an average particle diameter of 100 nm or less and an aspect ratio (a ratio of a maximum length/a minimum length) of less than 1.5, wherein the fine metallic particles are gold fine particles or silver fine particles and the translucent polymer has uniaxial birefringence due to uniaxial stretching; and the polarizer has an absorption spectrum with an absorption peak at a given wavelength, measured when polarized light incidences thereon, wherein if an azimuth of an incident polarization plane is altered relative to the polarizer, the absorption peak wavelength shifts in accordance with an alteration in the azimuth, in a case where an azimuth of the incident polarization plane relative to the polarizer is altered, if an azimuth of the incident polarization plane is 0 degree when an absorption peak wavelength of an absorption spectrum that is measured is the longest wavelength, which is referred to as λ1, by definition, if an azimuth of the polarization plane is gradually increased from 0 degree, a value of the absorption peak wavelength shifts to the short wavelength side in accordance with the increase, when an azimuth of the incident polarization plane is 90 degrees, a value of the absorption peak wavelength is the shortest wavelength, which is referred to as λ2, by definition, and satisfying a relation of(λ1−λ2)=10 to 50 nm.