Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1988-03-28
1991-08-20
Levy, Stuart S.
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
369 54, 369 58, 369116, G11B 7095, G11B 700
Patent
active
050420224
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an optical disk recording/reproducing apparatus wherein an optical disk is used as the recording medium to effect data recording and reproduction.
BACKGROUND
An opto-magnetic disk has been known as the large capacity recording medium permitting data re-writing. The data writing, reading and erasure to and from the opto-magnetic disk are usually performed with the use of a laser beam emitted by a laser diode. Heretofore, at the time of data writing or erasure, the laser diode remains energized during the periods other than the periods during which the laser beam irradiation is actually required, with the result that the life of the laser diode is short and the demanded guarantee time cannot be satisfied.
The tracks on the opto-magnetic disk are each divided into a plurality of sections, each of which is provided with a gap region for absorbing temporary errors, with the data being recorded in synchronism with each sector as one unit to effect data management or control on the sector basis.
With the opto-magnetic disk apparatus in which the opto-magnetic disk is employed as the recording medium and the data are recorded and/or reproduced by a laser diode, problems are presented as to the life of the laser diode and the reduction in the effective disk capacity, with the gap region provided in each track sector on the opto-magnetic disk representing an ineffective recording region.
It is therefore an object of the present invention to provide an optical disk recording/reproducing apparatus enabling the life of the laser diode to be lengthened and the disk capacity to be effectively utilized.
SUMMARY OF THE INVENTION
For accomplishing the above object, the present invention is applied to an opto-magnetic disk apparatus employing, for example, an opto-magnetic disk as the recording medium, and the optical disk recording/reproducing apparatus according to the present invention is characterized in that an opto-magnetic disk having pit regions with servo pits and data regions on which data will be written, that are alternately provided along the circumferential direction, is revolved at a constant angular velocity, reference clocks are formed in synchronism with said pits on the basis of the detection output obtained upon detecting said servo pits, and in that a laser diode is driven by pulses in synchronism with said reference clocks to write or erase data to or from said data region.
According to the present invention, the laser diode is driven by pulses at the timing of the reference clocks synchronized with the servo pits in the pit region of the opto-magnetic disk so that the data synchronized for the disk in its entirety may be written in each data region. The data thus written are erased on the bit-by-bit basis by driving the laser diode with pulses at the timing of the aforementioned reference clocks.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view showing recording patterns of the opto-magnetic disk employed in an embodiment of the present invention;
FIG. 2 is a schematic view showing the constitution of each track in the above embodiment;
FIG. 3 is a schematic view showing the construction of each pit region;
FIG. 4 is a schematic view showing the arrangement of the pits existing along the radial direction of the disk;
FIG. 5 is a block diagram showing the,, overall construction of an embodiment of the opto-magnetic disk apparatus according to the present invention;
FIG. 6 is a circuit diagram showing a typical construction of a laser drive circuit in the above embodiment;
FIG. 7 is a timing chart for understanding the operation of the aforementioned laser drive circuit;
FIG. 8 is a circuit diagram showing another typical construction of the laser drive circuit in the above embodiment;
FIG. 9 is a timing chart for understanding the operation of the laser drive circuit shown in FIG. 8;
FIG. 10 is a block diagram showing the overall construction of a modified embodiment of the opto-magnetic disk according to the present invention;
FIG. 11 is a
REFERENCES:
patent: 4685097 (1987-08-01), Van der Put
patent: 4733385 (1988-03-01), Henmi et al.
patent: 4744074 (1988-05-01), Imanaka et al.
patent: 4764913 (1988-08-01), Sasaki et al.
patent: 4783776 (1988-11-01), Ishigaki et al.
patent: 4796250 (1989-01-01), Kobayashi et al.
Levy Stuart S.
Nguyen Hoa
Sony Corporation
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