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US 12,704,766 B2Granted
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.
Claims22
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, light transmittance on a short wavelength side of a near-infrared light peak wavelength region, including 1550 nm and extending from 1450 nm to 1650 nm, is reduced from light transmittance at a short wavelength end at 1450 nm of the near-infrared light peak wavelength region as a wavelength is decreased from 1450 nm at least to 1350 nm, 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 at 1650 nm of the near-infrared light peak wavelength region as the wavelength is increased from 1650 nm at least to 1750 nm,
- wherein light transmittance in the near-infrared light peak wavelength region is greater than or equal to 60%.
2 more elements
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, 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 at least to 1350 nm, 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 at least to 1750 nm,
- wherein light transmittance in the near-infrared light peak wavelength region is greater than or equal to 60%, and
- wherein 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 to a short wavelength end of the visible light wavelength region, 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 to a long wavelength end of the visible light wavelength region.
3 more elements
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, 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 at least to 1350 nm, 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 at least to 1750 nm,
- wherein light transmittance in the near-infrared light peak wavelength region is greater than or equal to 60%.
3 more elements
Dependencies are inferred from the claim text.