Title:
OPTICAL FILTER AND STERILIZATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/112940
Kind Code:
A1
Abstract:
The present invention provides an optical filter which is capable of effectively transmitting ultraviolet light that has a wavelength of 220 nm to 225 nm, while suppressing transmission of ultraviolet light that has a wavelength of 240 nm to 320 nm. An optical filter 1 according to the present invention is provided with a transparent base material 2 and a multilayer dielectric film 3 that contains hafnium oxide and is arranged on the transparent base material 2; and if Ic is the diffraction intensity of a diffraction peak of the (1 1 1) crystal plane associated with a cubic hafnium oxide crystal, Im is the diffraction intensity of a diffraction peak of the (-1 1 1) crystal plane associated with a monoclinic hafnium oxide crystal, and Ia is the diffraction intensity of a diffraction peak associated with an amorphous hafnium oxide, the crystallization parameter P obtained by formula (1) is 0.7 or more. (1): P = (2 × Ic + Im)/(Ic + Im + Ia)
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Inventors:
HIMEI YUSUKE (JP)
Application Number:
PCT/JP2022/045959
Publication Date:
June 22, 2023
Filing Date:
December 14, 2022
Export Citation:
Assignee:
NIPPON ELECTRIC GLASS CO (JP)
International Classes:
G02B5/28; A61L2/10
Foreign References:
| JP2019115525A | 2019-07-18 | |||
| JP2013068885A | 2013-04-18 |
Attorney, Agent or Firm:
OSAKA FRONT (JP)
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