US4383262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser data recording method
Assignee: Fujifilm Holdings Corp
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Filing: 1981-03-12
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Granted: 1983-05-10
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Expires: 2001-03-12
Abstract
Abstract A laser data recording method in which data is recorded on a heat mode recording material with high sensitivity and low laser power. A scanned laser beam is adjusted to have a substantially circular configuration on the recording material with a diameter defined at an intensity value of 1/e 2 of approximately one scanning line pitch on the recording material. The laser beam is intensity modulated in such a manner that the ratio of the laser beam intensity in the "on" state to the laser beam intensity in the "off" state is in a range of 1:0.24 to 1:0.53, more preferably 1:0.25 to 1:0.50.
Inventors
- 👤 Masaru Noguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:23
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/24; G; G06; G06K; G06K15/00; G06K15/02; G06K15/028; G06K15/029; G11; G11B; G11B7/00; G11B7/12; G11B7/125; G11B7/24; G11B7/241; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
154 words
A laser data recording method in which data is recorded on a data recording material by scanning and modulating a laser beam, comprising the steps of: generating a scanning laser beam on said data recording material, said scanning laser beam having a substantially circular configuration and a diameter defined at an intensity value of 1/e 2 of said laser beam of approximately twice a scanning line pitch on said data recording material; and intensity modulating said scanning laser beam in such a manner that a ratio of a laser beam intensity in an "on" state to a laser beam intensity in an "off" state is in a range of from 1:0.24 to 1:0.53 producing a varying voltage bias such that D<Dx<2D, where Dx acts as the dot size in the scanning direction and D is a recording width obtained when scanning exposure is carried out continuously between adjacent dot positions of said recording material.
Claim 2
Dependent Claim
154 words
A laser data recording method in which data is recorded on a data recording material by scanning and modulating a laser beam, comprising the steps of: generating a scanning laser beam on said data recording material, said scanning laser beam having a substantially circular configuration and a diameter defined at an intensity value of 1/e 2 of said laser beam of approximately twice a scanning line pitch on said data recording material; and intensity modulating said scanning laser beam in such a manner that a ratio of a laser beam intensity in an "on" state to a laser beam intensity in an "off" state is in a range of from 1:0.24 to 1:0.53 producing a varying voltage bias such that D<Dx<2D, where Dx acts as the dot size in the scanning direction and D is a recording width obtained when scanning exposure is carried out continuously between adjacent dot positions of said recording material.
Claim 3
Dependent Claim
38 words
The laser data recording method of claim 1 wherein said ratio of said laser beam intensity in the "on" state to said laser beam intensity in the "off" state is in a range of from 1:0.25 to 1:0.50.
Claim 4
Dependent Claim
47 words
The laser data recording method of claim 1 or claim 2 wherein a size Dy in a direction perpendicular to the scanning direction of said laser beam of a dot is smaller than the size Dx of said dot in a direction parallel to said scanning direction.
References Cited (Backward Citations)
US4015221A
Cited
US4225873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-09 | 1986-11-08 | 1987-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-09 | 1990-11-08 | 1991-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-09 | 1994-11-08 | 1995-05-10 | $7700.00 | Window Closed / Lapsed |