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US 12,454,619 B2Granted
Optical filter and imaging device
AssigneeAGC Inc.
InventorsShoko Suzuki, Kazuhiko Shiono, Sayuri Yamada, Hiroki Hotaka
Life of this patent
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Abstract
An optical filter, including a first absorption layer containing a near-infrared absorbing dye and a transparent resin. The optical filter also includes a reflection layer. The first absorption layer has a thickness of 0.3 μm to 10 μm. The optical filter satisfies conditions described in the disclosure. An imaging apparatus including the optical filter.
Claims15
An optical filter, comprising:
- a first absorption layer comprising a near-infrared absorbing dye and a transparent resin;
- and a reflection layer,
- wherein the first absorption layer has a thickness of 0.3 μm to 10 μm, and
- wherein the optical filter satisfies the following (ii-2) to (ii-6):
- (ii-2) an average transmittance T435-480ave0° of light in a wavelength range of 435 to 480 nm is 70% or more at an incident angle of 0 degrees,
- (ii-3) an average transmittance T490-580ave0° of light in a wavelength range of 490 to 580 nm is 84% or more at an incident angle of 0 degrees,
- (ii-4) an average transmittance T800-900ave60° of light in a wavelength range of 800 to 900 nm is 0.1% or less at an incident angle of 60 degrees,
- (ii-5) a maximum transmittance T800-900max60° of light in a wavelength range of 800 to 900 nm is 2.1% or less at an incident angle of 60 degrees, and
- (ii-6) a wavelength λSHT20-0° that is a shorter wavelength of wavelengths showing a transmittance of 20% at an incident angle of 0 degrees is in a wavelength range of 640 to 690 nm, and a difference between a wavelength λSHT20-30° that is a shorter wavelength of wavelengths showing a transmittance of 20% at an incident angle 30 degrees and the wavelength λSHT20-0° is 10 nm or less.
6 more elements
Dependencies are inferred from the claim text.