Optical pickup apparatus

Details Optical pickup apparatus Optical pickup apparatus

1997-10-15

1999-03-30

Huber, Paul W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 58, G11B 700

Patent

active

058897496

ABSTRACT:
In an optical pickup apparatus which can be commonly used for a plurality of optical disks having different thickness values, thickness t of a optical transparent plane plate for thickness compensation is set by means of skew ray formula so that the amount of spherical aberration caused by the optical system is lowered, thus allowing accurate focusing for each of a plurality of optical disks having different thickness values. Spherical aberration S.A. is given by expression of S.A..ident.S'.sub.k -S'.sub.k0, wherein S'.sub.k is computed by expression of S'.sub.k =Ax.sub.k -(X'.sub.k /Y'.sub.k)Ay.sub.k. Here, by setting S'.sub.k -S'.sub.k0 =minimal value, the geometric thickness of the plane plate 8 can be determined.

REFERENCES:
patent: 5097464 (1992-03-01), Nishiuchi et al.
patent: 5235581 (1993-08-01), Miyagawa et al.

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