Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1996-08-23
1998-08-11
Huber, Paul W.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
430 5, G11B 700, G03F 900
Patent
active
057937338
ABSTRACT:
A polarizing beam-splitter comprises an optically isotropics crystalline substrate and a birefringent material layer made of an oriented polydiacetylene film formed on the optically isotropic crystalline substrate. A periodic grating photo-mask is formed in the birefringent material layer by an area that is changed into a different color phase when an ultra violet light is irradiated in a predetermined pattern on the birefringent material layer and by an area in which the color remains unchanged. The periodic grating photo-mask has a diffraction efficiency for the orientation of the oriented polydiacetylene film in the area that is changed into a different color phase which is lower than that in the area in which the color is unchanged.
REFERENCES:
patent: 5178978 (1993-01-01), Zanoni et al.
patent: 5493555 (1996-02-01), Kimura et al.
Fukuda Atsuo
Hayashi Yoshio
Ishikawa Ken
Nakao Satoru
Suzuki Takaaki
Huber Paul W.
Sankyo Seiki Mfg. Co. Ltd.
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