Writing and erasing information by varying the temperature of an

Details Writing and erasing information by varying the temperature of an Writing and erasing information by varying the temperature of an

1994-01-19

1995-11-21

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 13, 369116, 369 59, G11B 700

Patent

active

054694221

ABSTRACT:
Irradiation of the optical disk medium is pulsized to achieve reading, erasing and recording with binarized read power and write power; setting of erase power is dispensed with to shorten the process required to adjust the optical head; and the shapes of pits formed on the optical disk medium are optimized by varying the switching time between the write power and the read power to improve the CNR of read signals and the jitter characteristic.
Division is accomplished by a logical circuit into an area A in which a variation from the erase temperature to the write temperature is to take place, area B in which the write temperature is to be kept constant, area C in which a variation from the write temperature to the erase temperature is to take place, and area D in which the erase temperature is to be kept constant to generate, from data to be recorded and a clock pulse having a frequency equal to an integral multiple of the bit clock thereof, a recording signal representing the timing of laser irradiation.
This recording signal is supplied to a pulse current drive circuit to be converted into a pulse current for varying the laster irradiation power alternately between read power and write power, and the pulse current, to which a biasing direct current corresponding to the read power is added, is supplied to a laser diode.

REFERENCES:
patent: 4718053 (1988-01-01), Sato et al.
patent: 4839861 (1989-06-01), Ikegawa et al.
patent: 5276670 (1994-01-01), Nogami et al.
patent: 5289453 (1994-02-01), Ohno et al.
patent: 5321672 (1994-06-01), Miyamoto et al.
patent: 5353270 (1994-10-01), Iimura
patent: 5381396 (1995-01-01), Tanaka et al.
Patent Disclosure Gazettes of No. 1989-43816 and No. 1989-59633.

Affiliated with

Also associated with

Rating

Writing and erasing information by varying the temperature of an does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Writing and erasing information by varying the temperature of an, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Writing and erasing information by varying the temperature of an will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1143370