Information recording apparatus and information reproducing...

Details Information recording apparatus and information reproducing... Information recording apparatus and information reproducing...

2011-05-10

2011-05-10

Chow, Van N (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C359S035000, C359S868000

Reexamination Certificate

active

07940629

ABSTRACT:
Information light modulated and emitted by a modulation element is led to a recording medium through a Fourier transform optical system and an optical path shifter. An interference image is recorded on the recording medium by interference of the information light and reference light. A deflection unit of the optical path shifter has a pair of prisms. Optical path of information light transmitted through the respective prisms are shifted in parallel in a direction perpendicular to an optical axis of the Fourier transform optical system. By rotating the deflection unit around the optical axis, it is possible to shift the optical path of the information light around the optical axis while shifting the optical path in the direction perpendicular to the optical axis. Therefore, it is unnecessary to perform complicated control and it is possible to multiply record an interference image accurately with an information recording apparatus having a simple structure.

REFERENCES:
patent: 6058232 (2000-05-01), Lee et al.
patent: 2006/0215286 (2006-09-01), Okada et al.
H. Horimai et al., “Holographic Medium about to Take Off: 20 Gigabyte to be realized in 2006”, Nikkei Electronics, Nikkei Business Publications, Inc., Jan. 17, 2005, No. 891, pp. 105-114; Together with an English-language translation of relevant parts.

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