Recording or playback devices for optical information carriers h

Details Recording or playback devices for optical information carriers h Recording or playback devices for optical information carriers h

1996-03-27

1999-07-13

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 4437, 369 58, G11B 7095

Patent

active

059236264

ABSTRACT:
The present invention to provides for information carriers of different storage densities, a recording and/or playback device which is compatible or can be used for different optical information carriers despite a functional relationship which to be satisfied between the size of the information memory location or pit size and the size of the light spot, without changing the wavelength of the laser used or changing the numerical aperture of the objective lens. In order to operate optical information carriers of different storage densities, use is made of an optical system which has a wavelength and numerical aperture matched to the highest storage density, provides a plurality of secondary beams matched to the respective track width, and has a number of secondary beam detector pairs which corresponds to the number of different information carriers. The information or data signal of an optical information carrier of relatively low storage density in the compatible recording and/or playback device is then reconstructed by detecting the rise in the signal of the information carrier which is detected from the information carrier by the main beam.

REFERENCES:
patent: 4532522 (1985-07-01), Tsunoda et al.
patent: 5140577 (1992-08-01), Ohsato
patent: 5184340 (1993-02-01), Kachi et al.

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