Light-shielding film for optical element and optical element having light-shielding film

A coating material comprising:

• a resin;
• dye;
• and
• inorganic particles,
• wherein the coating material comprises such content of the dye and the inorganic particles that an average of extinction coefficient of a coating film for light having wavelengths ranging from 400 to 700 nm is 0.03 or more and 0.15 or less, the coating film being formed by hardening the coating material,
• wherein a content of the dye in the coating film is 13 wt % or more and 50 wt % or less,
• wherein the inorganic particles comprise titania having an average particle diameter of 100 nm or less and silica particles, and
• wherein the inorganic particles further comprise (i) no inorganic black particles each having a degree of blackness of 0.7 or more, or (ii) inorganic black particles each having a degree of blackness of 0.7 or more so that a content of the inorganic black particles in the coating film is 9.76 wt % or less.

An optical element comprising a base material and a light-shielding film on the base material,

• wherein the light-shielding film comprises a resin, dye, and inorganic particles,
• wherein the light-shielding film has an average thickness of 2 μm or more and 30 μm or less, and
• wherein the light-shielding film comprises such content of the dye and the inorganic particles that has an average of extinction coefficient of the light-shielding film for light having wavelengths ranging from 400 to 700 nm is 0.03 or more and 0.15 or less,
• wherein a content of the dye in the coating film is 13 wt % or more and 50 wt % or less,
• wherein the inorganic particles comprise inorganic non-black particles each having a refractive index (nd) of 2.2 or more, the non-black particles having an average particle diameter of 100 nm or less and silica particles, and
• wherein a content of inorganic black particles each having a degree of blackness of 0.7 or more is 0 wt % or more and 9.76 wt % or less.

An optical element comprising a base material and a light-shielding film on the base material,

• wherein the light-shielding film comprises a resin, dye, and inorganic particles,
• wherein the light-shielding film has an average thickness of 2 μm or more, and
• wherein the light-shielding film comprises such content of the dye and the inorganic particles that has an average of extinction coefficient of the light-shielding film for light having wavelengths ranging from 400 to 700 nm is 0.03 or more and 0.15 or less,
• wherein the content of the dye in the coating film is 13 wt % or more and 50 wt % or less, and
• wherein the inorganic particles comprise titania having an average particle diameter of 100 nm or less and silica particles, and
• wherein a content of inorganic black particles each having a degree of blackness of 0.7 or more is 0 wt % or more and 9.76 wt % or less.