Recorded area detection to prevent information overwriting

Details Recorded area detection to prevent information overwriting Recorded area detection to prevent information overwriting

1993-08-18

1995-09-26

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Electrical modification or sensing of storage medium

369 54, 369 58, 369 48, 369124, 369116, G11B 700

Patent

active

054539714

ABSTRACT:
An apparatus for detecting an information recorded area on an information recording medium having the information recorded area and an information non-recorded area. The apparatus includes an optical head for radiating a light beam onto the information recording medium, a motor for rotating the information recording medium. In the apparatus, an electrical signal corresponding to a reflected light reflected by the information recording medium while the information recording medium is rotated is generated. The electrical signal corresponds to the information recorded in the information recorded area, and the electrical signal changes between a first potential level and a second potential level which is different from the first potential level. Further, in the apparatus, a threshold signal is generated by dropping the first potential level with a prescribed potential and raising the second potential level with the prescribed potential, and delaying the electrical signal. The electrical signal is compared with the threshold signal and a resulting signal is generated. The information recorded area on the information recording medium is detected based on the resulting signal.

REFERENCES:
patent: 4956832 (1990-09-01), Miyasaka
patent: 5060218 (1991-10-01), Chiyomatsu
patent: 5101396 (1992-03-01), Takeuchi et al.
patent: 5132954 (1992-07-01), Kulakowski et al.
patent: 5229985 (1993-07-01), Oshiba
patent: 5283779 (1994-02-01), Otsuki
patent: 5305298 (1994-04-01), Yokota

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