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OPTICAL FILTER, SOLID-STATE IMAGING ELEMENT, IMAGING DEVICE LENS AND IMAGING DEVICE

  • US 20140091419A1
  • Filed: 12/06/2013
  • Published: 04/03/2014
  • Est. Priority Date: 06/06/2011
  • Status: Active Grant
First Claim
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1. An optical filter comprising a near infrared ray absorbing layer having a near infrared ray absorbing dye (A) dispersed in a transparent resin (B), whereinthe near infrared ray absorbing dye (A) comprises a near infrared ray absorbing dye (A1) having a maximum absorption peak such that in an absorption spectrum of light in a wavelength region of from 400 to 1,000 nm as measured upon being dissolved in a solvent for dye having a refractive index (n20d) of less than 1.500, a peak wavelength is present in a region of from 695 to 720 nm, a full width at half maximum is not more than 60 nm, and when calculated with an absorbance at the peak wavelength being 1, a value obtained by dividing a difference between an absorbance at 630 nm and an absorbance at the peak wavelength by a wavelength difference between 630 nm and the peak wavelength is from 0.010 to 0.050;

  • the transparent resin (B) has a refractive index (n20d) of 1.54 or more; and

    the near infrared ray absorbing layer has a transmittance of visible light of from 450 to 600 nm of 70% or more, a transmittance of light in a wavelength region of from 695 to 720 nm of not more than 10%, and an amount of change D of transmittance expressed by the following equation (1) of not more than −

    0.8;


    D(%/nm)=[T700(%)−

    T630(%)]/[700(nm)−

    630(nm)] 



    (1)whereinin the equation (1), T700 is a transmittance at a wavelength of 700 nm in a transmission spectrum of the near infrared ray absorbing layer; and

    T630 is a transmittance at a wavelength of 630 nm in the transmission spectrum of the near infrared ray absorbing layer.

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