Optical pickup deformable mirror

摘要

The present invention provides an optical pickup deformable mirror used for correcting a spherical aberration caused by a difference in thickness of a cover glass of a recording medium, wherein the optical pickup deformable mirror is deformed into a rotation-symmetrical surface obtained by rotating a curve represented by the following expression f(r):f(r)=ar2+g(r) where r is the distance from the axis of rotational symmetry, a is an actual number except for 0, and g(r) satisfies |g(r)|<=1 mum.