Optical recording medium information reproducing apparatus

Details Optical recording medium information reproducing apparatus Optical recording medium information reproducing apparatus

1995-12-29

1997-09-09

Edun, Muhammad N.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 54, 369100, 369109, G11B 700

Patent

active

056663404

ABSTRACT:
An optical recording medium information reproducing apparatus comprises; an optical system irradiating a light beam onto an optical recording medium in such a manner that the formed light spot covering a plurality of mark regions such as a pit and a land formed on and along the track of the medium; a second optical system of image formation for forming real images for the mark regions and the track to make an image surface by receiving a reflected light from the light spot; photodetecters for detecting the real images with a plurality of light receiving areas arranged along the real images of the mark regions and the track; and a processing circuit for computing the output signal of the photodetecters at a signal representing a length of each mark region in the track direction. Therefore, an information signal recorded on the recording medium is exactly reproduced without any adverse influence due to variations of the time base caused by rotational variations or the like of the spindle motor.

REFERENCES:
patent: 5355361 (1994-10-01), Maeda
patent: 5430704 (1995-07-01), Maeda
patent: 5463608 (1995-10-01), Higuchi

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