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US 5,400,313 AGranted
Optical data storage system and method with reduced heat buildup
AssigneeInternational Business Machines Corporation
InventorsKarl A. Belser, Jerry E. Hurst, Jr., Michael R. Madison
Life of this patent
Estimating the term…
Abstract
An optical data storage system records pulse width modulated data as a series of contiguous and overlapping circular marks. A minimum number of circular marks are used to record the desired run length. Circular marks which overlap by greater or equal to one half the diameter of the circular mark are recorded using two different laser power levels. The result is that thermal buildup in the medium is kept to a minimum and the edge transitions are accurately positioned.
Claims64
An optical data storage system comprising:
- an optical data storage medium;
- a radiation source for directing a radiation beam to the medium;
- a movement device for moving the medium relative to the radiation beam;
- and
- a controller connected to the radiation source for pulsing the radiation beam to form substantially circular marks on the medium, the marks forming runs of variable length wherein the length of the runs corresponds to digital data, a run of three or more connecting marks having an overlap occurring on two of the marks in the run and not overlapping the remaining marks in the run.
2 more elements
A method for optical data storage comprising the steps of:
- moving an optical data storage medium relative to a radiation source;
- directing a radiation beam from the radiation source to the medium;
- and
- pulsing the radiation beam to form substantially circular marks on the medium, the marks forming runs of variable length wherein the length of the runs correspond to digital data, forming a run of three or more connecting marks, overlapping two of the marks in the run and not overlapping the remaining marks in the run.
1 more element
An optical data storage system comprising:
- an optical data storage medium;
- a radiation source for directing a radiation beam to the medium;
- a movement device for moving the medium relative to the radiation beam;
- and
- a controller connected to the radiation source for pulsing the radiation beam to write substantially circular marks on the medium, the marks forming runs of variable length wherein the length of the runs correspond to digital data, three or more circular marks comprising a run having a leading edge mark, a trailing edge mark, and at least one intermediate filler mark, wherein one of the filler marks is comprised of a circular mark having a diameter less than the diameter of the leading and trailing edge marks and which is contiguous with the surrounding marks, the controller including a filler mark device for producing the filler mark of a reduced diameter.
2 more elements
A method for optical data storage comprising the steps of:
- moving an optical data storage medium relative to a radiation source;
- directing a radiation beam from the radiation source to the medium;
- and
- using a controller to pulse the radiation beam to form substantially circular marks on the medium, the marks forming runs of variable length wherein the length of the runs correspond to digital data, three or more circular marks comprising a run having a leading edge mark, a trailing edge mark, and at least one intermediate filler mark, wherein one of the filler marks is comprised of a circular mark having a diameter less than the diameter of the leading and trailing edge marks and which is contiguous with the surrounding marks, the controller including a filler mark device for producing the filler mark of a reduced diameter.
1 more element
The method of claim 62, wherein the diameter of the filler mark is substantially one-third of the diameter of the leading and trailing edge marks.
A method for optical data storage comprising the steps of:
- moving an optical data storage medium relative to a radiation source;
- directing a radiation beam from the radiation source to the medium;
- and
- pulsing the radiation beam to form substantially circular marks on the medium, the marks forming runs of variable length wherein the length of the runs correspond to digital data, the pulsed radiation beam having a first power level and a second power level less than the first power level, a run having two or more circular marks, wherein two of the marks overlap each other by greater than or equal to one-half the diameter of the circular mark, is formed with one of the two overlapping marks formed by a pulsed radiation beam of a first power level and the remaining one of the two overlapping marks formed by a pulsed radiation beam of the second power level, the overlap containing at most two marks.
1 more element
An optical data storage system comprising:
- an optical data storage medium;
- a radiation source having a plurality of power levels, for directing a radiation beam to the medium;
- a movement device for moving the medium relative to the radiation beam;
- and
- a controller connected to the radiation source for pulsing the radiation beam to form substantially circular marks on the medium, the marks forming runs of variable length wherein the length of the runs correspond to digital data, the pulsed radiation beam having a first power level and a second power level less than the first power level, a run having two or more circular marks, wherein two of the marks overlap each other by greater than or equal to one-half the diameter of the circular mark, is formed with one of the two overlapping marks formed by a pulsed radiation beam of a first power level and the remaining one of the two overlapping marks formed by a pulsed radiation beam of the second power level, the overlap containing at most two marks.
2 more elements
A method for optical data storage comprising the steps of:
- moving an optical data storage medium relative to a radiation source;
- directing a radiation beam from the radiation source to the medium;
- and
- pulsing the radiation beam to form substantially circular marks on the medium, the marks forming runs of variable length wherein the length of the runs correspond to digital data, three or more marks written in a connecting manner having an overlap occurring on a nontrailing edge mark and having no overlap occurring on a trailing edge mark.
1 more element
An optical data storage system comprising:
- an optical data storage medium;
- a radiation source for directing a radiation beam to the medium;
- a movement device for moving the medium relative to the radiation beam;
- and
- a controller connected to the radiation source for pulsing the radiation beam to form substantially circular marks on the medium, the marks forming runs of variable length wherein the length of the runs correspond to digital data, three or more marks written in a connecting manner are written with an overlap occurring on a nontrailing edge mark and having no overlap occurring on a trailing edge mark.
2 more elements
Dependencies are inferred from the claim text.