Imaging lens and imaging apparatus
AssigneeFUJIFILM Corporation
InventorShinichi Shimotsu
Life of this patent
Estimating the term…
Abstract
An imaging lens including: a plurality of lenses; and a coating provided on at least a part of the plurality of lenses. In a near-infrared light wavelength region, by the coating, light transmittance on a short wavelength side of a near-infrared light peak wavelength region including 1550 nm is reduced from light transmittance at a short wavelength end of the near-infrared light peak wavelength region as a wavelength is decreased, and light transmittance on a long wavelength side of the near-infrared light peak wavelength region is reduced from light transmittance at a long wavelength end of the near-infrared light peak wavelength region as the wavelength is increased.
Claims19
An imaging lens comprising:
- a plurality of lenses;
- and
- a coating provided on at least a part of the plurality of lenses,
- wherein in a near-infrared light wavelength region, by the coating, light transmittance on a short wavelength side of a near-infrared light peak wavelength region including 1550 nm is reduced from light transmittance at a short wavelength end of the near-infrared light peak wavelength region as a wavelength is decreased, and light transmittance on a long wavelength side of the near-infrared light peak wavelength region is reduced from light transmittance at a long wavelength end of the near-infrared light peak wavelength region as the wavelength is increased,
- light transmittance in the near-infrared light peak wavelength region is greater than or equal to 60%, and
- in a visible light wavelength region, by the coating, light transmittance on a short wavelength side of a visible light peak wavelength region including a range of 500 nm to 650 nm is reduced from light transmittance at a short wavelength end of the visible light peak wavelength region as the wavelength is decreased, and light transmittance on a long wavelength side of the visible light peak wavelength region is reduced from light transmittance at a long wavelength end of the visible light peak wavelength region as the wavelength is increased.
An imaging lens comprising:
- a plurality of lenses;
- a coating provided on at least a part of the plurality of lenses, and
- an optical filter switching unit capable of arranging at least one of a first optical filter decreasing light transmittance of at least a part of visible light or a second optical filter decreasing light transmittance of at least a part of near-infrared light, on an optical path,
- wherein in a near-infrared light wavelength region, by the coating, light transmittance on a short wavelength side of a near-infrared light peak wavelength region including 1550 nm is reduced from light transmittance at a short wavelength end of the near-infrared light peak wavelength region as a wavelength is decreased, and light transmittance on a long wavelength side of the near-infrared light peak wavelength region is reduced from light transmittance at a long wavelength end of the near-infrared light peak wavelength region as the wavelength is increased,
- wherein light transmittance in the near-infrared light peak wavelength region is greater than or equal to 60%.
Dependencies are inferred from the claim text.