| 摘要 |
本发明提供一种滤光器，其改良先前的近红外线截止滤光器等滤光器所具有的问题点，于透过波长区域的末端附近亦具有广视角、且可见光透过率与红外光线截止特性优异。所述滤光器具有含有近红外线吸收色素的透明树脂制基板、及形成于所述基板的至少一个面上的近红外线反射膜，且满足(A)~(C)的要件：(A)于波长430nm~580nm中，自滤光器的垂直方向所测定的透过率的平均值为75%以上。(B)于波长800nm~1000nm中，自滤光器的垂直方向所测定的透过率的平均值为20%以下。(C)于波长560nm~800nm中，自滤光器的垂直方向所测定的透过率变成10%的最长的波长的值(Za)、与自相对于滤光器的垂直方向为30°的角度所测定的透过率变成10%的最长的波长的值(Zb)的差的绝对值未满25nm。; the optical filter has a wide view angle near an end of a transmission wavelength region, and an excellent visible light transmittance and infrared cut-off property. The optical filter has a substrate made of a transparent resin containing a near-infrared absorption dye, and a near-infrared reflection film formed on at least one surface of the substrate. The optical filter satisfies conditions (A) to (C): (A) in wavelength of 430 to 580 nm, an average value of transmittance measured from a direction vertical to the optical filter is 75% or more; (B) in wavelength of 800 to 1000 nm, an average value of transmittance measured from a direction vertical to the optical filter is 20% or less; (C) in wavelength of 560 to 800 nm, an absolute value of the difference between a value (Za) of a longest wavelength in which the transmittance measured from a direction vertical to the optical filter becomes 10% and a value (Zb) of a longest wavelength in which the transmittance measured from an angle of 30° |
