| CPC G02B 5/208 (2013.01) | 12 Claims |
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1. An optical filter comprising:
a first dielectric multilayer film;
a substrate comprising a near-infrared ray absorbing glass and a resin film; and
a second dielectric multilayer film in this order,
wherein the resin film comprises a near-infrared ray absorbing dye and a resin,
the near-infrared ray absorbing glass is a fluorophosphate glass comprising P, Cu, and F, and
the optical filter satisfies all of the following spectral characteristics (i-1) to (i-3), (i-5) to (i-7), and (i-13):
(i-1) an absolute value of a difference between an average transmittance T440-600(0deg)AVE at a wavelength of 440 nm to 600 nm and an incident angle of 0 degrees and an average transmittance T440-600(60deg)AVE at a wavelength of 440 nm to 600 nm and an incident angle of 60 degrees is 15% or less,
(i-2) the average transmittance T440-600(0deg)AVE is 75% or more,
(i-3) a wavelength IR_T50(0deg) at which a transmittance is 50% at an incident angle of 0 degrees is in a wavelength range of 580 nm to 640 nm,
(i-5) an average transmittance T800-1200(0deg)AVE at a wavelength of 800 nm to 1200 nm and an incident angle of 0 degrees is 5% or less,
(i-6) when the first dielectric multilayer film side is set as an incident direction, an average reflectance R1440-650(5deg)AVE at a wavelength of 440 nm to 650 nm and an incident angle of 5 degrees is 1.5% or less,
(i-7) when the first dielectric multilayer film side is set as an incident direction, an average reflectance R1850-1200(5deg)AVE at a wavelength of 850 nm to 1200 nm and an incident angle of 5 degrees is 60% or more,
(i-13) when the first dielectric multilayer film side is set as an incident direction, an absolute value of a difference between a wavelength IR_R50(0deg) at which a reflectance is 50% at an incident angle of 5 degrees in a wavelength range of 750 nm to 900 nm and a wavelength IR_T50(5deg) at which a transmittance is 50% at an incident angle of 5 degrees in a wavelength range of 580 nm to 640 nm is 160 nm or more.
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