Optical filter and imaging device

Abstract

The present invention provides a filter and imaging device constructed using glass that is difficult to cut and having sufficient bending strength. The filter (10) of the present invention sequentially comprises a first dielectric multilayer film (200), a resin layer (210), a near-infrared absorbing glass (100) and a third dielectric multilayer film (230), with a coefficient of thermal expansion of 80×10-7 / K to 120×10-7 / K and a fracture toughness of 0.35 MPa・√m to 0.55 MPa・√m. A first mirror layer (110) is disposed on the side of the second resin layer (210), and the line roughness of the first mirror layer (110) is less than 0.5 μm. A second mirror layer (120) is disposed on the side of the third dielectric multilayer film (230), and the line roughness of the second mirror layer (120) is less than 0.5 μm. The line roughness of region B of the crack layer (130) is greater than the line roughness of regions A and C.

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