Phase change recording apparatus having front and rear pulse cha

Details Phase change recording apparatus having front and rear pulse cha Phase change recording apparatus having front and rear pulse cha

1997-09-17

2000-03-28

Dinh, Tan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 59, 369124, G11B 709

Patent

active

060440554

ABSTRACT:
Where data are recorded onto a phase-change disk according to the MCAV (modified constant angular velocity) scheme to enable high-density recording and high-speed random access, marks and spaces are formed by using recording pulses having a front end pulse and a rear end pulse that are delayed so as to be suited to each of a low linear velocity zone and a high linear velocity zone. This is done by changing the pulse widths of the front end pulse and the rear end pulse by varying the positions of the rising edge and the falling edge of the front end pulse and the rear end pulse, respectively, that constitute the recording pulses. Thus, recording compensation suitable for each linear velocity is effected.

REFERENCES:
patent: 5150351 (1992-09-01), Ohno et al.
patent: 5291470 (1994-03-01), Nishiuchi et al.
patent: 5347505 (1994-09-01), Moritsugu et al.
patent: 5367514 (1994-11-01), Kobayashi et al.
patent: 5412626 (1995-05-01), Ohno et al.
patent: 5798996 (1998-08-01), Arai
patent: 5802032 (1998-09-01), Jacobs et al.
patent: 5848043 (1998-12-01), Takada et al.

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