Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1989-10-17
1992-10-13
Levy, Stuart S.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
3692753, 360 59, 360114, G11B 1112, G11B 1304, G11B 1110
Patent
active
051557142
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a recording method suitable for a magneto-optic recording system, and more particularly to a magneto-optic recording method capable of performing high speed accessing in addition to high density recording.
2. Description of the Related Art
Conventionally, magneto-optic disks have been well-known as a medium which utilizes the magneto-optic effect (Kerr effect) to perform recording and reproduction. The magneto-optic recording apparatus writes on the magneto-optic disk, and comprises a magnetic head placed over the top surface of a magneto-optic disk for generating an alternating magnetic field in response to a recording signal, and an optical pick-up placed under the magnetic head for beaming a laser onto the back surface of the magneto-optic disk. The data is written by the alternating magnetic field into the pit on the magneto-optic disk which is formed by the heat from the laser beam when the temperature of the medium rises to the Curie point or higher.
Magneto-optic recording is well-known for its high recording density, because the track density and line density are remarkably improved in comparison with the prior magnetic recording. In prior art magneto-optic recording, it is commonly known that data are written sequentially on the track.
However, with the above mentioned prior art magneto-optic recording, there remains the following problems to be solved:
(1) When data are written sequentially with a narrow space between pits, non-negligible thermal interference between the front and rear of the disk limits high density recording.
(2) When many data are sequentially written onto one track, the writing rate is limited by the frequency characteristics of the magnetic head employed and the capabilities of the magnetic head drive circuit. That is, the frequency characteristics of the magnetic head are much lower than those of the optical pick-up. This means that the speed of revolution of the magneto-optic disk has to be decreased. Therefore, a revolution waiting time for accessing data on a certain track becomes long, so that it is difficult to perform high speed accessing.
SUMMARY OF THE INVENTION
In order to overcome the above mentioned problems, an object of the present invention is to provide a magneto-optic recording method which is capable of performing high density recording as well as high speed accessing.
A magneto-optic recording method according to the present invention in order to achieve the above purposes is characterized in that in a magneto-optic recording method of writing onto a magneto-optic recording medium by a magnetic head, which performs magnetic field modulation in response to a recording signal, and an optical pick-up, a first group of data pits are recorded onto the above magneto-optic medium with a wider spacing than a predetermined pit recording spacing of data pits on the magneto-optic recording medium, and each pit of a second group of data pits are recorded between the neighboring data pits of the first group of data pits.
The data pits of the second data pit group have the same spacing as those of the first data pit group, and each data pit of the second data bit group is recorded spaced at least at the predetermined data pit recording interval from each neighboring pit of the first data pit group.
A recording signal recorded onto the first and second data pit groups may be adjusted to a frequency corresponding to the data pit recording intervals of the first and second data pit groups. Also, both the data pit recording intervals of the first and second data pit groups, and the frequency of the recording signal, may be determined in accordance with the frequency characteristics of the magnetic head.
The frequency of the recording signal is adjusted by the system clock pulse. The optical pick-up is operably controlled so as to scan separately each data pit of the first data pit group and each data pit of the second data pit group, by a separate disk revolution for the scanning of each gro
REFERENCES:
patent: 4858212 (1989-08-01), Tahahashi et al.
patent: 4901297 (1990-02-01), Komatsu et al.
patent: 4938915 (1990-07-01), Saito
patent: 4949198 (1990-08-01), Huijer et al.
Kananen Ronald P.
Levy Stuart S.
Rhoa Joseph A.
Sony Corporation
LandOfFree
Interleaving method for interleaved magneto-optic recording of a does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Interleaving method for interleaved magneto-optic recording of a, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interleaving method for interleaved magneto-optic recording of a will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1306463