Inactivating device and optical filter
AssigneeUshio Denki Kabushiki Kaisha
InventorHideaki Yagyu
Life of this patent
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Abstract
An inactivating device includes: an ultraviolet light source to emit ultraviolet light, a main light-emission wavelength band of the ultraviolet light being at least partly included in a range from 200 nm to 230 nm inclusive; and an optical filter including a multilayer dielectric film, wherein with respect to the ultraviolet light incident at an incidence angle of 0 degrees, the optical filter has a band in which the ultraviolet light in a range of wavelengths from 190 nm to 235 nm inclusive is transmitted, and a wavelength λ5 at which transmittance of the optical filter indicates 5% is longer than or equal to 236 nm and shorter than 245 nm.
Claims7
An inactivating device comprising:
- an ultraviolet light source to emit ultraviolet light, a main light-emission wavelength band of the ultraviolet light being at least partly included in a range from 200 nm to 230 nm inclusive;
- and
- an optical filter including a multilayer dielectric film, the ultraviolet light generated by the ultraviolet light source being incident on the optical filter,
- wherein with respect to the ultraviolet light incident at an incidence angle of 0 degrees, the optical filter:
- has a band in which the ultraviolet light in a range of wavelengths from 190 nm to 235 nm inclusive is transmitted,
- has a transmittance greater than 5% at a wavelength of 235 nm, and
- has a wavelength λ5 that is longer than or equal to 237 nm and shorter than 245 nm, wherein the wavelength λ5 is defined as a wavelength at which the transmittance of the optical filter is 5%, and
- wherein in a distribution of a relative intensity for each angle component of radiant flux of the ultraviolet light generated by the ultraviolet light source and incident on the optical filter, the incidence angle at which the relative intensity shows a peak value is included in a range from 10 degrees to 50 degrees inclusive.
An optical filter included in an inactivating device, the inactivating device comprising an ultraviolet light source to emit ultraviolet light, a main light-emission wavelength band of the ultraviolet light being at least partly included in a range from 200 nm to 230 nm inclusive, the optical filter including:
- a multilayer dielectric film, the ultraviolet light generated by the ultraviolet light source being incident on the optical filter,
- wherein with respect to ultraviolet light incident at an incidence angle of 0 degrees on the optical filter, the optical filter:
- has a band in which the ultraviolet light in a range of wavelengths from 190 nm to 235 nm inclusive is transmitted,
- has a transmittance greater than 5% at a wavelength of 235 nm, and
- has a wavelength λ5 that is longer than or equal to 237 nm and shorter than 245 nm,
- wherein the wavelength λ5 is defined as a wavelength at which the transmittance of the optical filter is 5%, and
- wherein in a distribution of a relative intensity for each angle component of radiant flux of the ultraviolet light generated by the ultraviolet light source and incident on the optical filter, the incidence angle at which the relative intensity shows a peak value is included in a range from 10 degrees to 50 degrees inclusive.
Dependencies are inferred from the claim text.