Disc-thickness-and-warp detecting apparatus

Details Disc-thickness-and-warp detecting apparatus Disc-thickness-and-warp detecting apparatus

1996-10-17

1998-07-28

Swann, Tod R.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 94, 369 4426, 369120, G11B 713

Patent

active

057870624

ABSTRACT:
A disc-thickness-and-warp detecting apparatus includes a light source for emitting rays onto a peripheral portion of an optical disc; a photo-detector having a plurality of photo-detecting portions separated corresponding to the direction of tracks formed on the disc, for detecting rays emitted from the light source and reflected by the disc; an adding circuit for generating a sum-signal by adding the detection-signals from the respective photo-receiving portions; and a subtracting circuit for generating a difference-signal by performing the subtraction of the detection-signals from the respective photo-receiving portions. The apparatus uses such common detecting means to detect the distance between the disc surface and the signal-recording surface and a warp of the disc.

REFERENCES:
patent: 5430701 (1995-07-01), Ito et al.
patent: 5553052 (1996-09-01), Oono et al.
patent: 5555232 (1996-09-01), Kobayashi et al.
patent: 5621717 (1997-04-01), Finkelstein et al.

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