Patents Assigned to Konica Minolta Optp, Inc.
  • Objective lens and optical pickup device
    Patent number: 8406111
    Abstract: Provided are an objective lens with enhanced transmittance and an optical pickup apparatus which can record and/or reproduce information properly for three kinds of discs with different recording densities, even if a single lens is used as the objective lens. When all the expressions (1) to (3) are satisfied, excellent aberration characteristics can be obtained for the three kinds of discs: ?0.02?m1?0.02 (1); 0?(WD1?WD2)?1.57 m2+0.123 or 1.57 m2+0.24?(WD1?WD2)?0.7 (2); and 0?(WD1?WD3)?1.79 m3+0.333 or 1.66 m3+0.508?(WD1?WD3)?0.7 (3).
    Type: Grant
    Filed: July 21, 2009
    Date of Patent: March 26, 2013
    Assignee: Konica Minolta Optp, Inc.
    Inventors: Kiyono Tateyama, Kentarou Nakamura