Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
2000-01-06
2000-09-12
Edun, Muhammad
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4412, 369 93, 369 4423, G11B 712
Patent
active
061187496
ABSTRACT:
An optical pickup apparatus includes a light source for emitting a light flux; and a converging optical system having a first, second, and third divided surface, which are divided in the order named from the vicinity of an optical axis of the converging optical system, for converging the light flux emitted from the light source, wherein a beam spot passing through the first and third divided surfaces is formed onto a first optical information recording medium having a transparent substrate whose thickness is t1, and a beam spot passing through the first and second surfaces is formed onto a second optical information recording medium having a transparent substrate whose thickness is t2 that is more than t1. The optical pickup apparatus further includes an image sensor for receiving a light flux reflected from the first and/or second optical information recording medium.
REFERENCES:
patent: 5446565 (1995-08-01), Komma et al.
patent: 5835283 (1998-11-01), Yamanaka
patent: 5966364 (1999-10-01), Kamatani
Arai Norikazu
Saito Shin'ichiro
Yamazaki Hiroyuki
Edun Muhammad
Konica Corporation
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