Objective lens, optical head and optical information...

Details Objective lens, optical head and optical information... Objective lens, optical head and optical information...

2007-09-18

2007-09-18

Korzuch, William (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C359S656000, C359S719000, C359S804000

Reexamination Certificate

active

10663596

ABSTRACT:
A light beam emitted from a light source is focused by an objective lens onto an information recording surface of an optical information recording medium. The objective lens has a substantially truncated-cone-shaped portion on its surface on the side of the optical information recording medium. This makes it possible to prevent interference with a DVD-RAM cartridge and ensure optical compatibility with a BD and a DVD.

REFERENCES:
patent: 6744568 (2004-06-01), Kitamura et al.
patent: 2002/0097508 (2002-07-01), Wada et al.
Makoto Itonaga, (2001), “Optical design for compatible lens between DVD and the next generation video disk system”,Journal of the Magnetics Society of Japan, vol. 25, No. 3-2, pp. 446-450.

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