Patent ID: 7258912

Claim:
A hard laminated film comprising a layer A and a layer B of specific compositions deposited alternately, wherein the crystal structure of layer A differs from the crystal structure of layer B, the thickness of layer A per layer is two or more times that of layer B per layer, the thickness of layer B per layer is 0.5 nm or more, and the thickness of layer A per layer is 200 nm or less, wherein said layer A and said layer B have the compositions shown below: Layer A: (Cr 1-α X α )(B a C b N 1-a-b-c O c ) e wherein, X is one, two or more elements selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Mo, W, Al and Si, and 0≦α≦0.9, 0≦a≦0.15, 0≦b≦0.3, 0≦c≦0.1, 0.2≦e≦1.1 (α is the atomic ratio of X, and a, b, c are respectively the atomic ratios of B, C, O,). Layer B: B 1-s-t C s N t wherein, 0≦s≦0.25, (1-s-t)/t≦1.5 (s, t are respectively the atomic ratios of C and N,). or, Si 1-x-y C x N y wherein, 0<x≦0.25, 0.5≦(1-x-y)/y≦1.4 (x, y are respectively the atomic ratios of C and N). or, C 1-u N u wherein 0≦u≦0.6 (u is the atomic ratio of N).