Dynamic information storage or retrieval – Storage medium structure – Layered
Reexamination Certificate
2006-08-29
2006-08-29
Young, Wayne (Department: 2627)
Dynamic information storage or retrieval
Storage medium structure
Layered
C369S112250
Reexamination Certificate
active
07099264
ABSTRACT:
The invention discloses a flat-plate lens to be built in an optical recording medium for improving the image-forming characteristics of the recording medium. The flat-plate lens of the invention comprises a layered thin film having a periodical structure in the direction of thickness thereof corresponding to a wavelength slightly longer than the wavelength of the light used for recording and retrieving information into and from the recording medium. The thin film of a periodical structure is formed by alternate lamination of pluralities of layers two materials having different refractive indices such as a combination of MgF2and ZnS. When the thin film having such a periodical structure is formed with good uniformity allover the surface, the image-forming performance on the recording layer can be uniform irrespective of the position on the flat-plate lens.
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Fukaya Toshio
Tominaga Junji
National Institute of Advanced Industrial Science and Technology
Pham Van T.
Wenderoth , Lind & Ponack, L.L.P.
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