Diffraction optical element, molding die for the optical...

Details Diffraction optical element, molding die for the optical... Diffraction optical element, molding die for the optical...

2011-03-22

2011-03-22

Edun, Muhammad N (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112040, C369S112100, C369S044120

Reexamination Certificate

active

07911921

ABSTRACT:
A diffraction optical element is provided to reduce harmful lights and also suppress deterioration in the optical characteristics of the element. The diffraction optical element22is formed with a plurality of diffraction gratings17′, 18′, 19′ and20′. From these diffraction gratings, there are selected the diffraction gratings18′, 19′ and20′ whose groove apex angles are less than a predetermined angle. The diffraction gratings18′, 19′ and20′ has chamfer surfaces18c′, 19c′ and20c′ formed on the lower side of respective slanted surfaces18a′, 19a′ and20a′. The chamfer surfaces18c′, 19c′ and20c′ are slanted to the slanted surfaces18a′, 19a′ and20a′, respectively.

REFERENCES:
patent: 6097863 (2000-08-01), Chowdhury
patent: 7315419 (2008-01-01), Taira et al.
patent: 2001/0038503 (2001-11-01), Nakai
patent: 2002-189114 (2002-07-01), None

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