There is provided an optical reproduction apparatus and an optical recording
and reproduction apparatus which can improve a CNR and can read at high speed.
The center portion of a laser light emitted from a semiconductor laser is shaded
by a light shading portion of a first light shade, and its peripheral portion is
condensed and irradiates a super-resolution film of an optical disk. The center
portion of a reflected light from the optical disk is mainly made of a signal component,
and a noise component almost disappears. Thus, the reflected light from the optical
disk is separated into the center portion and its peripheral portion, and the reflected
light made of the signal component of the center portion is used for signal reproduction,
so that the CNR can be increased.
