US5400313A
Expired / Lapsed
US
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Optical data storage system and method with reduced heat buildup
Assignee: Mitsubishi Electric Corp
•
Filing: 1992-11-09
•
Granted: 1995-03-21
•
Expires: 2012-11-09
Abstract
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.
Inventors
- 👤 Karl A. Belser
- 👤 Jerry E. Hurst, Jr.
- 👤 Michael R. Madison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:49
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/004; G11B7/0045; G11B11/00; G11B11/10; G11B11/105; G11B11/10502; G11B11/1053; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B20/1423; G11B20/1426; G11B11/10504; G11B11/10506
Claims Analysis
Total Claims: 72
Claim 1
Independent Claim
101 words
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.
Claim 2
Dependent Claim
101 words
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.
Claim 3
Dependent Claim
16 words
The system of claim 1, wherein the duration of the pulse is 15 nanoseconds or less.
Claim 4
Dependent Claim
25 words
The system of claim 1, wherein four or more marks are formed in a connecting manner, and the overlap occurs on a nonleading edge mark.
Claim 5
Dependent Claim
25 words
The system of claim 1, wherein four or more marks are formed in a connecting manner and the overlap occurs on a leading edge mark.
Claim 6
Dependent Claim
22 words
The system of claim 1, wherein the width of the overlap is equal to one-half of the diameter of the circular marks.
Claim 7
Dependent Claim
22 words
The system of claim 1, wherein the width of the overlap is equal to two-thirds of the diameter of the circular marks.
Claim 8
Dependent Claim
22 words
The system of claim 1, wherein the width of the overlap is equal to one-third of the diameter of the circular marks.
Claim 9
Dependent Claim
39 words
The system of claim 1, wherein one of the two marks which overlap is formed by a pulsed radiation beam at a reduced power level compared to the power level used to form the other marks in the run.
Claim 10
Independent Claim
88 words
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.
Claim 11
Independent Claim
88 words
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.
Claim 12
Dependent Claim
16 words
The method of claim 9, wherein the duration of the pulse is 15 nanoseconds or less.
Claim 13
Dependent Claim
25 words
The method of claim 9, wherein four or more marks are formed in a connecting manner and the overlap occurs on a nonleading edge mark.
Claim 14
Dependent Claim
25 words
The method of claim 9, wherein four or more marks are formed in a connecting manner and the overlap occurs on a leading edge mark.
Claim 15
Dependent Claim
22 words
The method of claim 9, wherein the width of the overlap is equal to one-half of the diameter of the circular marks.
Claim 16
Dependent Claim
22 words
The method of claim 9, wherein the width of the overlap is equal to two-thirds of the diameter of the circular marks.
Claim 17
Dependent Claim
22 words
The method of claim 9, wherein the width of the overlap is equal to one-third of the diameter of the circular marks.
Claim 18
Dependent Claim
39 words
The method of claim 9, wherein one of the two marks which overlap is formed by a pulsed radiation beam at a reduced power level compared to the power level used to form the other marks in the run.
Claim 19
Dependent Claim
146 words
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.
Claim 20
Dependent Claim
146 words
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.
Claim 21
Dependent Claim
39 words
The system of claim 17, wherein at least one of the filler marks is formed by a pulsed radiation beam at a reduced power level compared to the power level used to form the leading and trailing edge marks.
Claim 22
Dependent Claim
87 words
The system of claim 17, wherein a radiation beam of a first power level is used to form a single unconnected circular mark, a radiation beam of a second power level is used to form the leading and trailing edge marks, and a radiation beam of a third power level is used to form the filler marks, the second power level being 95-99% of the first power level, the third power level being greater or equal to 50% and less than 70% of the first power level.
Claim 23
Dependent Claim
25 words
The system of claim 17, wherein the diameter of the filler mark is substantially one-third of the diameter of the leading and trailing edge marks.
Claim 24
Dependent Claim
25 words
The system of claim 17, wherein the diameter of the filler mark is substantially two-thirds of the diameter of the leading and trailing edge marks.
Claim 25
Dependent Claim
25 words
The system of claim 17, wherein the diameter of the filler mark is substantially one-half of the diameter of the leading and trailing edge marks.
Claim 26
Dependent Claim
16 words
The system of claim 17, wherein the duration of the pulse is 15 nanoseconds or less.
Claim 27
Independent Claim
140 words
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.
Claim 28
Independent Claim
140 words
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.
Claim 29
Dependent Claim
39 words
The method of claim 24, wherein at least one of the filler marks is formed by a pulsed radiation beam at a reduced power level compared to the power level used to form the leading and trailing edge marks.
Claim 30
Dependent Claim
87 words
The method of claim 24, wherein a radiation beam of a first power level is used to form a single unconnected circular mark, a radiation beam of a second power level is used to form the leading and trailing edge marks, and a radiation beam of a third power level is used to form the filler marks, the second power level being 95-99% of the first power level, the third power level being greater or equal to 50% and less than 70% of the first power level.
Claim 31
Dependent Claim
25 words
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.
Claim 32
Dependent Claim
25 words
The method of claim 24, wherein the diameter of the filler mark is substantially two-thirds of the diameter of the leading and trailing edge marks.
Claim 33
Independent Claim
25 words
The method of claims 24, wherein the diameter of the filler mark is substantially one-half of the diameter of the leading and trailing edge marks.
Claim 34
Dependent Claim
16 words
The method of claim 24, wherein the duration of the pulse is 15 nanoseconds or less.
Claim 35
Independent Claim
158 words
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.
Claim 36
Independent Claim
158 words
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.
Claim 37
Dependent Claim
70 words
The method of claim 31, wherein circular marks which overlap by less than half the diameter of the circular mark are formed with one of the marks formed by a pulsed radiation beam of the first power level and the remaining mark formed by a pulsed radiation beam of a third power level, the third power level less than the first power level but greater than the second power level.
Claim 38
Dependent Claim
33 words
The method of claim 32, wherein circular marks which overlap by less than half the diameter of the circular marks have an overlap width equal to one-third the diameter of the circular marks.
Claim 39
Dependent Claim
25 words
The method of claim 31, wherein the second power level is greater or equal to 80% and less than 90% of the first power level.
Claim 40
Dependent Claim
26 words
The method of claim 31, wherein three or more marks are formed in a connecting manner and an overlap occurs only on a nontrailing edge mark.
Claim 41
Dependent Claim
26 words
The method of claim 31, wherein three or more marks are formed in a connecting manner and an overlap occurs only on a nonleading edge mark.
Claim 42
Dependent Claim
35 words
The method of claim 31, wherein a single nonconnecting circular mark is formed by a pulsed radiation beam of a third power level, the third power level greater than the first and second power levels.
Claim 43
Dependent Claim
22 words
The method of claim 31, wherein the width of the overlap is equal to one-half of the diameter of the circular marks.
Claim 44
Dependent Claim
22 words
The method of claim 31, wherein the width of the overlap is equal to two-thirds of the diameter of the circular marks.
Claim 45
Dependent Claim
16 words
The method of claim 31, wherein the duration of the pulse is 15 nanoseconds or less.
Claim 46
Dependent Claim
174 words
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.
Claim 47
Dependent Claim
174 words
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.
Claim 48
Dependent Claim
70 words
The system of claim 41, wherein circular marks which overlap by less than half the diameter of the circular mark are formed with one of the marks formed by a pulsed radiation beam of the first power level and the remaining mark formed by a pulsed radiation beam of a third power level, the third power level less than the first power level but greater than the second power level.
Claim 49
Dependent Claim
33 words
The system of claim 42, wherein circular marks which overlap by less than half the diameter of the circular mark have an overlap width equal to one-third the diameter of the circular marks.
Claim 50
Dependent Claim
15 words
The system of claim 41, wherein the duration the pulse is 15 nanoseconds or less.
Claim 51
Dependent Claim
25 words
The system of claim 41, wherein the second power level is greater or equal to 80% and less than 90% of the first power level.
Claim 52
Dependent Claim
26 words
The system of claim 41, wherein three or more marks are formed in a connecting manner and an overlap occurs only on a nontrailing edge mark.
Claim 53
Dependent Claim
26 words
The system of claim 41, wherein three or more marks are formed in a connecting manner and an overlap occurs only on a nonleading edge mark.
Claim 54
Dependent Claim
35 words
The system of claim 41, wherein a single nonconnecting circular mark is formed by a pulsed radiation beam of a third power level, the third power level greater than the first and second power levels.
Claim 55
Dependent Claim
22 words
The system of claim 41, wherein the width of the overlap is equal to one-half of the diameter of the circular marks.
Claim 56
Dependent Claim
22 words
The system of claim 41, wherein the width of the overlap is equal to two-thirds of the diameter of the circular marks.
Claim 57
Independent Claim
90 words
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.
Claim 58
Independent Claim
90 words
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.
Claim 59
Dependent Claim
22 words
The method of claim 51, wherein the width of the overlap is equal to two-thirds of the diameter of the circular marks.
Claim 60
Dependent Claim
22 words
The method of claim 51, wherein the width of the overlap is equal to one-third of the diameter of the circular marks.
Claim 61
Dependent Claim
16 words
The method of claim 53, wherein the duration of the pulse is 15 nanoseconds or less.
Claim 62
Dependent Claim
25 words
The method of claim 53, wherein four or more marks are formed in a connecting manner and the overlap occurs on a nonleading edge mark.
Claim 63
Dependent Claim
25 words
The method of claim 51, wherein four or more marks are formed in a connecting manner and the overlap occurs on a leading edge mark.
Claim 64
Dependent Claim
22 words
The method of claim 51, wherein the width of the overlap is equal to one-half of the diameter of the circular marks.
Claim 65
Dependent Claim
102 words
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.
Claim 66
Dependent Claim
102 words
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.
Claim 67
Dependent Claim
22 words
The system of claim 58, wherein the width of the overlap is equal to one-half of the diameter of the circular marks.
Claim 68
Dependent Claim
22 words
The system of claim 58, wherein the width of the overlap is equal to two-thirds of the diameter of the circular marks.
Claim 69
Dependent Claim
22 words
The system of claim 58, wherein the width of the overlap is equal to one-third of the diameter of the circular marks.
Claim 70
Dependent Claim
16 words
The system of claim 58, wherein the duration of the pulse is 15 nanoseconds or less.
Claim 71
Dependent Claim
25 words
The system of claim 58, wherein four or more marks are formed in a connecting manner and the overlap occurs on a nonleading edge mark.
Claim 72
Dependent Claim
25 words
The system of claim 58, wherein four or more marks are formed in a connecting manner and the overlap occurs on a leading edge mark.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1998-03-20 | 1998-09-19 | 1999-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-20 | 2002-09-19 | 2003-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-20 | 2006-09-19 | 2007-03-21 | $7700.00 | Window Closed / Lapsed |