Optical recording/reproducing apparatus

Details Optical recording/reproducing apparatus Optical recording/reproducing apparatus

2005-07-05

2005-07-05

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C369S044320

Reexamination Certificate

active

06914730

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 farthest 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.

REFERENCES:
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I. Ichimura, et al.; “O plue E”; Sharp; pp 175-181; vol. 22; No. 2; Feb. 2000 (with partial English translation).

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