Optical device for recording and reproducing information

Claim 1

An optical device for recording and reproducing information, comprising: a laser source means for emitting a laser beam; an objective lens for converging the laser beam emitted by said laser source means onto a surface of an optical information recording medium so as to write optical information on said recording medium; and a deflection means disposed between said laser source means and said objective lens for deflecting said emitted laser beam toward said objective lens; said deflection means comprising a deflection member having a deflection surface which deflects said emitted laser beam toward said objective lens, a partially spherical seat having a partially spherical surface thereof and an end surface thereof opposing said spherical surface, and a cylindrical hollow formed in a flat wall portion of a housing which supports said objective lens, said spherical surface centering a deflection point on said deflection surface of said deflection member which is mounted on said end surface of said spherical seat, said spherical seat being supported at said spherical surface thereof on an inner peripheral edge of said flat wall portion, said inner peripheral edge being defined by a wall of said flat wall portion defining said cylindrical hollow and an inner surface of said flat wall portion, said deflection member being attached to said end surface of said supported spherical seat such that said attached deflection member and said supported spherical seat can be pivoted around said deflection point.