| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical pickup capable of completely eliminating a stray light generated when a multilayer information recording medium is subjected to recording/reproducing, an optical recording device, an optical reproducing device, and an optical recording/reproducing device. <P>SOLUTION: In a section obtained by viewing a detection optical system from a track direction, when a reading light is converged in the m-th recording layer of a recording medium, a front light shielding means 11 is arranged between the convergence spot fm of its reflected light Lm by a detection convergent lens 6 and the convergent spot fm+1 of a stray luminous flux from an m+1-th layer, a rear light shielding means 12 is arranged between the convergence spot fm and the convergent spot fm-1 of a stray luminous flux from an m-1-th layer, and only a signal luminous flux Lm reaches a light receiving element 8 through both light shielding means. <P>COPYRIGHT: (C)2007,JPO&INPIT |
