Apparatus for playing optical recording media of different recor

Details Apparatus for playing optical recording media of different recor Apparatus for playing optical recording media of different recor

1991-07-29

1994-02-22

McElheny, Jr., Donald E.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4441, G11B 700

Patent

active

052894436

ABSTRACT:
An optical recording medium player reproduces a signal with lower intermodulation even in case of a reading laser beam for an optical recording medium is used having a wavelength different from a standard wavelength. The player comprises photoelectric converting means having a light receiving surface divided into central and peripheral regions, amplifying means for amplifying the output signals from the divided receiving surfaces, adding means for adding the outputs of each amplifying means, discriminating means for discriminating the type of a recording medium being played, and adjusting means for adjusting the sensitivities of signal processing systems including photoelectric converting means in accordance with the result of discrimination. Even in case the wavelength of reading laser beam of optical recording medium is different from the wavelength of reading laser beam as defined for a standard recording medium, it is possible to obtain a reproduction signal with less intermodulation.

REFERENCES:
patent: 4972400 (1990-11-01), Kuwabara et al.
patent: 5126988 (1992-06-01), Nishiguma et al.

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