US 12,287,500 B2
Optical filter, method for manufacturing same, and optical module
Tomoya Matsuda, Osaka (JP); Yudai Numata, Osaka (JP); Masato Katsuda, Osaka (JP); and Shoichi Matsuda, Osaka (JP)
Assigned to NITTO DENKO CORPORATION, Osaka (JP)
Appl. No. 17/911,902
Filed by NITTO DENKO CORPORATION, Osaka (JP)
PCT Filed Mar. 15, 2021, PCT No. PCT/JP2021/010417
§ 371(c)(1), (2) Date Sep. 15, 2022,
PCT Pub. No. WO2021/187434, PCT Pub. Date Sep. 23, 2021.
Claims priority of application No. 2020-045671 (JP), filed on Mar. 16, 2020; and application No. 2020-163409 (JP), filed on Sep. 29, 2020.
Prior Publication US 2023/0129841 A1, Apr. 27, 2023
Int. Cl. G02B 5/20 (2006.01); G02B 5/02 (2006.01)
CPC G02B 5/206 (2013.01) [G02B 5/0242 (2013.01); G02B 5/208 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An optical filter, comprising:
a matrix and fine particles dispersed in the matrix,
wherein the fine particles have a parameter Ds that is not smaller than 8.0 and not larger than 30, the parameter Ds being given by Ds=λ/(B·cos θ·Ra) found from a USAXS pattern, where λ is the wavelength of a X-ray, θ is half of the scattering angle 2θ (rad) giving the peak of the scattering intensity, B is the half width of the peak (FWHM, rad), and Ra is the average particle diameter of the fine particles,
wherein the fine particles form at least a colloidal amorphous array so as not to cause Bragg reflection, and
wherein the optical filter exhibits a white color.