Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1982-03-12
1984-10-16
McElheny, Jr., Donald E.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
G11B 700
Patent
active
044778910
ABSTRACT:
An optical playback system is used to recover data recorded in an elongated information track, comprising undulations representative of the data, on a surface of a record medium. The data is recorded over two substantially different frequency bands, for example, a video signal may be recorded over a high frequency deviation range and a sound signal may be recorded over a low frequency deviation range. The optical playback system is provided with a dual response characteristic. The response of the system to the low frequency signals is improved by utilizing a properly oriented linearly polarized readout light beam for recovering the low frequency signals, by using a light source that provides a relatively short wavelength light beam, and by providing an input stop for varying the effective numerical aperture of the objective lens and an output stop which is matched to the shape of the input stop.
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McElheny Jr. Donald E.
RCA Corporation
Roehling Jerald E.
Tripoli Joseph S.
Whitacre Eugene M.
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