Information reading and recording apparatus

Details Information reading and recording apparatus Information reading and recording apparatus

2005-09-13

2005-09-13

Young, W. R. (Department: 2653)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112240

Reexamination Certificate

active

06944111

ABSTRACT:
An information reading and recording apparatus includes a super-resolution cut-off filter having an annular metal reflection film at its center portion and disposed immediately before one of two objective lenses with a higher NA. When reading DVD, the one objective lens with a higher NA with the super-resolution cut-off filter disposed therebefore is positioned at the optical path. When reading CD, the other objective lens with a lower NA is positioned at the optical path. The laser beam reflected by a disk follows backward the incoming optical path to pass through a half mirror, and is received by a photo-detector to be converted into an electrical signal.

REFERENCES:
patent: 6660986 (2003-12-01), Matsumoto et al.

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