Abstract
We proposed a new structure of a grating holder in an optical pickup to reduce angular displacement of the grating with expansion or shrinkage of adhesives fixing the holder.The holder has a square shape and a slit at each of four corners.The central portion of the holder deforms in the direction opposite to the rotational direction of the outer portion,so that this structure can reduce angular displacement of the grating.Our calculated result shows that the angular displacement of the grating is less than 0.1 ° with slits in 40-70% depth of the holder height.
