Information recording system capable of preventing overwriting

Details Information recording system capable of preventing overwriting Information recording system capable of preventing overwriting

1990-09-28

1992-03-31

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4411, G11B 700

Patent

active

051013967

ABSTRACT:
In an information recording system, a semiconductor laser is energized in response to a drive current which is modulated in accordance with a recording signal in a recording mode so that a modulated laser beam is generated from the semiconductor laser. The modulated laser beam is focused on an optical disk and is reflected from the optical disk and the reflected laser beam is detected by an photo-detector. A detection signal from the detector is compared with a predetermined threshold level which is set in accordance with the peak intensity by a binary circuit and a relationship between the recording signal and an output signal from the binary circuit is detected by a detection circuit. In an overwrite mode in which the laser beam is focused on pit or pits on the optical disk, an overwrite detection signal is generated from the detection circuit and the overwrite detection signal is mounted by a counter circuit. When the counter circuit counts a predetermined count value, the counter citcuit generates a recording inhibition signal for preventing the semiconductor laser from generating the modulated laser beam.

REFERENCES:
patent: 4570251 (1986-02-01), Yokota et al.
patent: 4651706 (1986-12-01), Batalden et al.
patent: 4858219 (1989-08-01), Yoshikawa
patent: 4956832 (1990-09-01), Miyasaka
patent: 4982347 (1991-01-01), Yokota

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