Optical recording/reproducing apparatus

Details Optical recording/reproducing apparatus Optical recording/reproducing apparatus

2011-03-01

2011-03-01

Psitos, Aristotelis (Department: 2627)

Optical: systems and elements

Lens

Including a nonspherical surface

C369S112240, C369S044320

Reexamination Certificate

active

07898748

ABSTRACT:
An optical recording/reproducing apparatus is arranged so that, upon recording or reproducing a recording medium having a plurality of recording layers, the gap of the lens groups at the time of forming a converged light spot on this first recording layer is DIS (1), the gap of the lens groups at the time of forming the converged light spot on the N-th layer (the furthest layer from the surface of the recording medium) is DIS (N) and the neutral point of the spherical-aberration correcting mechanism is set at a position satisfying the following expression: lens group gap dst (3)=((DIS (1)+DIS (N))/2.

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