Optical head and disk unit

Details Optical head and disk unit Optical head and disk unit

2006-01-31

2006-01-31

Korzuch, William (Department: 2653)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S013330, C369S300000

Reexamination Certificate

active

06992968

ABSTRACT:
An optical head and a disk unit are provided, in which the height and the weight of the optical head are reduced to enable a disk unit of small size and high recording density. The optical head has 2-group lenses containing a first lens arranged on a side of a semiconductor laser and a second lens arranged to face a recording layer of an optical disk, and an optical axis of the objective lens is arranged in parallel to the recording layer. The optical head can be reduced in height and the weight according to the constitution.

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Kittaka et al., “Near-Field Objective With Radial Grin Rodlens”, International Symposium on Optical Memory, 2000.

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