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US 12,181,697 B2Granted
Optical filter
AssigneeAGC Inc.
InventorsKazuhiko Shiono, Takashi Nagata
Life of this patent
Estimating the term…
Abstract
An optical filter, includes: a substrate, a dielectric multilayer film 1 laid on or above one major surface of the substrate, and a dielectric multilayer film 2 laid on or above the other major surface of the substrate, in which the substrate includes a near infrared ray absorbing glass and a resin film, the resin film includes a resin and a pigment (NIR1), and the optical filter satisfies all of spectral characteristics (i-1) to (i-3), (i-6) to (i-8), and (i-10) to (i-13).
Claims14
An optical filter, comprising:
- a substrate,
- a dielectric multilayer film 1 laid on or above one major surface of the substrate, and
- a dielectric multilayer film 2 laid on or above the other major surface of the substrate, wherein
- the substrate comprises a near infrared ray absorbing glass and a resin film,
- the resin film has a thickness of 10 μm or less,
- the resin film comprises a resin and a pigment (NIR1), and
- the optical filter satisfies all of the following spectral characteristics (i-1) to (i-3), (i-6) to (i-8), and (i-10) to (i-13):
- (i-1) in a spectral transmittance curve at an incident angle of 0 degrees, an average transmittance T450-600(0deg)AVE at a wavelength of 450 nm to 600 nm is 80% or more,
- (i-2) in a spectral transmittance curve at an incident angle of 50 degrees, an average transmittance T450-600(50deg)AVE at the wavelength of 450 nm to 600 nm is 80% or more,
- (i-3) an absolute value of a difference between the average transmittance T450-600(0deg)AVE and the average transmittance T450-600(50deg)AVE is 5% or less,
- (i-6) in the spectral transmittance curve at an incident angle of 0 degrees, a maximum transmittance T450-600(0deg)MAX at the wavelength of 450 nm to 600 nm is 90% or more,
- (i-7) in the spectral transmittance curve at an incident angle of 0 degrees, a wavelength IR50(0deg) at which a transmittance is 50% is in a range of 610 nm to 650 nm,
- (i-8) in the spectral transmittance curve at an incident angle of 50 degrees, a wavelength IR50(50deg) at which a transmittance is 50% is in the range of 610 nm to 650 nm,
- (i-10) in the spectral transmittance curve at an incident angle of 0 degrees, a maximum transmittance T1000-1200(0deg)MAX at a wavelength of 1,000 nm to 1,200 nm is 5% or less,
- (i-11) in the spectral transmittance curve at an incident angle of 50 degrees, a maximum transmittance T1000-1200(50deg)MAX at the wavelength of 1,000 nm to 1,200 nm is 5% or less,
- (i-12) the transmittance T450(0deg)/the maximum transmittance T1000-1200(0deg)MAX≥25, and
- (1-13) the transmittance T450(50deg)/the maximum transmittance T1000-1200(50deg)MAX≥10.
14 more elements
Dependencies are inferred from the claim text.