Optical pick device capable of being compatible with different thickness optical recording medium

The device has an inner area, an annular lens area and an outer area centred at a vertex. The annular lens area has a ring shape and divides the inner area from the outer area. The inner area, the annular lens area and the outer area have aspherical shapes so that, in the case of reading the first m...

Full description

Saved in:
Bibliographic Details
Main Author RYU CHANGHUN,CHUNG JONGSAM,LEE CHOLWU
Format Patent
LanguageEnglish
Published 22.03.2006
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
Online AccessGet full text

Cover

More Information
Summary:The device has an inner area, an annular lens area and an outer area centred at a vertex. The annular lens area has a ring shape and divides the inner area from the outer area. The inner area, the annular lens area and the outer area have aspherical shapes so that, in the case of reading the first medium, light transmitted through the inner area and the outer area is focused into a single light spot by which information is read from the information recording surface of the first medium. The light transmitted through the annular lens area is scattered so as not to be focused on the information recording surface of the first medium. In the case of reading the second medium, the light transmitted through the inner area and the annular lens area is focused into a single light spot by which information is read from the information recording surface of the second medium. The light transmitted through the outer lens area is scattered so as not to be focused on the information recording surface of the second medium.
Bibliography:Application Number: CN2001119558