Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1996-05-16
1997-11-25
Edun, Muhammad N.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369112, 369 4411, G11B 712
Patent
active
056919700
ABSTRACT:
An optical pickup for high-density recording/reproducing, which can read the information recorded at a close interval to exceed the limit of a given cut-off frequency, includes an objective lens having divided portions for respectively transmitting a zero-order optical component and .+-.1st-order diffracted components. To detect a signal for reproduction, a focusing lens is used for focusing the zero-order component and .+-.1st-order diffracted components passing back through the objective lens so as to mutually interfere. Stable high-density optical recording/reproduction can be realized regardless of the numerical aperture of the objective lens and the optical wavelength.
REFERENCES:
patent: 5579298 (1996-11-01), Opheij et al.
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Edun Muhammad N.
Samsung Electronics Co,. Ltd.
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