Solid-state image capture element optical filter and application thereof
An object of the present invention is to provide a solid-state image capture element optical filter having excellent visible light transmission characteristics with reduced incidence angle dependence even in the near-ultraviolet wavelength region, in which the defects of conventional optical filters such as near-infrared cut filters are improved; and a device comprising the optical filter. The solid-state image capture element optical filter of the present invention comprises: a transparent resin substrate comprising a compound (X) having an absorption maximum in a wavelength range of 300 to 420 nm and a compound (Y) having an absorption maximum in a wavelength range of 600 to 800 nm; and a near infrared-reflecting film on at least one side of the substrate.
1. A solid-state image capture element optical filter, comprising:
a transparent resin substrate which comprises a compound (X) having an absorption maximum in a wavelength range of 300 to 420 nm and a compound (Y) having an absorption maximum in a wavelength range of 600 to 800 nm; and
a near infrared-reflecting film on at least one side of said substrate;
wherein
an average transmittance in a wavelength range of 800 nm to 1,000 nm is at most 1%,
wherein the average transmittance in the wavelength range of 800 nm to 1,000 nm is measured under a condition that an incidence angle of incoming light is perpendicular to the optical filter.
2. The solid-state image capture element optical filter according to claim 1 , wherein said compound (X) is at least one selected from the group consisting of azomethine-based compounds, indole-based compounds, benzotriazole-based compounds and triazine-based compounds.
3. The solid-state image capture element optical filter according to claim 1 , wherein a maximum absolute value (U) of a difference between the transmittance in the vertical direction in a wavelength region of ±20 nm from a wavelength (H) at which the transmission of the optical filter is 50% in a wavelength region of 300 to 450 nm and a transmittance at 30° with respect to the vertical direction in the same wavelength region is less than 25%.
4. A solid-state imaging device, comprising the solid-state image capture element optical filter according to claim 1 .
5. A camera module, comprising the solid-state image capture element optical filter according to claim 1 .
6. The solid-state image capture element optical filter according to claim 1 , wherein an average transmittance in a wavelength range of 430 nm to 580 nm is 84% to 91%, wherein the average transmittance in the wavelength range of 430 nm to 580 nm is measured under a condition that an incidence angle of incoming light is perpendicular to the optical filter.