An optical security component intended to be observed in reflection, with the naked eye, via at least a first observation face, comprising: - a dielectric first layer that is at least partially transparent in the visible and that has a first refractive index (n 1), - a reflective second layer that forms a reflective interface with said first layer in at least a first region, wherein: - said reflective interface comprises at least a first optical structure with first elementary surfaces (I 1) and second elementary surfaces (I 2), the contours of said first and second elementary surfaces being complementary seen from above, - the first elementary surfaces (I 1) follow the profile of a first one-dimensional array (ML 1) of first cylindrical microlenses (L 1) that are identical to one another and periodically arranged in a first direction (Δ 1), with a first period (p 1); - the second elementary surfaces (I 2) follow the profile of a second one-dimensional array (ML 2) of second cylindrical microlenses (L 2) that are identical to one another, said second array being superposed on said first array (ML 1), the curvature of said second cylindrical microlenses being lower than those of said first cylindrical microlenses; - said first elementary surfaces (I 1) or said second elementary surfaces (I 2) have contours forming, seen from above, recognizable and identical micro-images arranged periodically in a second direction and with a second period, the optical component generating, in reflection and under the effect of a tilting movement about an axis perpendicular to said first direction, a magnification and a movement of said first micro-images via Moire magnification. - a dielectric first layer that is at least partially transparent in the visible and that has a first refractive index (n 1), - a reflective second layer that forms a reflective interface with said first layer in at least a first region, - said reflective interface comprises at least a first optical structure with first elementary surfaces (I 1) and second elementary surfaces (I 2), the contours of said first and second elementary surfaces being complementary seen from above, - the first elementary surfaces (I 1) follow the profile of a first one-dimensional array (ML 1) of first cylindrical microlenses (L 1) that are identical to one another and periodically arranged in a first direction (Δ 1), with a first period (p 1); - the second elementary surfaces (I 2) follow the profile of a second one-dimensional array (ML 2) of second cylindrical microlenses (L 2) that are identical to one another, said second array being superposed on said first array (ML 1), the curvature of said second cylindrical microlenses being lower than those of said first cylindrical microlenses; - said first elementary surfaces (I 1) or said second elementary surfaces (I 2) have contours forming, seen from above, recognizable and identical micro-images arranged periodically in a second direction and with a second period, the optical component generating, in reflection and under the effect of a tilting movement about an axis perpendicular to said first direction, a magnification and a movement of said first micro-images via Moire magnification.