Hologram optical device, compatible optical pickup including...

Details Hologram optical device, compatible optical pickup including... Hologram optical device, compatible optical pickup including...

2011-08-30

2011-08-30

Lamb, Christopher R (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112150

Reexamination Certificate

active

08009543

ABSTRACT:
A hologram optical device, a compatible optical pickup including the hologram optical device, and an optical information storage medium system including the compatible optical pickup are provided. The hologram optical device includes: a first hologram area having a hologram that is asymmetric with respect to an optical axis to diffract an incident light in a 0thorder diffractive light and a 1storder diffractive light, wherein light spots are formed by focusing the 0thorder and 1storder diffractive lights using a lens. Accordingly, a light spot of the 1storder diffractive light is formed at a position separated from an optical axis of the lens when a light spot formed by the 0thorder diffractive light is formed on the optical axis of the lens.

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International Search Report and Written Opinion of the International Searching Authority issued on May 26, 2008, in counterpart International Application No. PCT/KR2008/000927 (11 pages).

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