Tilt detection device including a light-shielding member of light at both sides in radial direction of the optical disk

摘要

A light-emitting element (40a; 50a) emits a light toward an optical disk (1). A plurality of light-receiving elements (40b; 50b) receives the light reflected from the optical disk (1). A light-shielding member (40d; 50d) is provided between the optical disk (1) and at least one of the light-emitting element (40a; 50a) and the light-receiving elements (40b; 50b) so as to shield parts of the light at both sides in a radial direction of the optical disk (1). A tilt of the optical disk (1) is detected according to an intensity distribution of the light on the light-receiving elements (40b; 50b). <IMAGE>