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 (MI) 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 (MI) 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. <EOS>