US4734550A
Expired / Lapsed
US
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Laser processing method
Assignee: New Energy and Industrial Technology Development Organization
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Filing: 1986-08-19
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Granted: 1988-03-29
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Expires: 2006-08-19
Abstract
Abstract A laser processing method comprises the steps of generating a pulsed laser beam having a substantially circular shape; modifying the beam to a substantially rectangular shape; and scribing the surface of a workpiece with the rectangular beam to form grooves therein. The scribing step may include scanning the surface with the beam in a predetermined pattern, and aligning two parallel sides of the rectangular beam in parallel with the direction of the scanning. The beam may be made square, or may have unequal sides with the longer sides preferably arranged in parallel with the scanning direction.
Inventors
- 👤 Seiji Imamura
- 👤 Noriaki Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:28
CPC Classifications
B; B23; B23K; B23K26/00; B23K26/08; B23K26/083; B23K26/0853; B23K26/02; B23K26/06; B23K26/064; B23K26/066; B23K26/073; B23K26/0732; B23K26/36; B23K26/362; B23K26/364
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
94 words
A laser processing method for scribing the surface of a workpiece, said method comprising: generating a laser beam; modifying said beam to have a substantially rectangular shape; and scribing said surface of said workpiece with said rectangular beam to form a groove in said surface, said scribing step including periodically moving said rectangular beam relative to and along said surface, each movement of said beam causing said beam to irradiate a portion of said surface to form said groove, each of said portions overlapping an adjacent one of said portions by a predetermined amount.
Claim 2
Dependent Claim
94 words
A laser processing method for scribing the surface of a workpiece, said method comprising: generating a laser beam; modifying said beam to have a substantially rectangular shape; and scribing said surface of said workpiece with said rectangular beam to form a groove in said surface, said scribing step including periodically moving said rectangular beam relative to and along said surface, each movement of said beam causing said beam to irradiate a portion of said surface to form said groove, each of said portions overlapping an adjacent one of said portions by a predetermined amount.
Claim 3
Dependent Claim
51 words
The laser processing method of claim 1, wherein said rectangular beam has a first set of parallel sides, and said scribing step includes moving said beam relative to said surface in a predetermined pattern while maintaining said first set of parallel sides substantially in parallel with the direction of said movement.
Claim 4
Dependent Claim
43 words
The method of claim 2, wherein said rectangular beam has a second set of parallel sides shorter than said first set of parallel sides, and said scribing step includes maintaining said second set of parallel sides substantially perpendicular to said direction of movement.
Claim 5
Dependent Claim
14 words
The method of claim 2, wherein said rectangular beam has sides of equal length.
Claim 6
Dependent Claim
36 words
The method of claim 2, wherein said beam modifying step includes, passing said beam through a rectangular aperture of a field stop to form said rectangular beam, and focusing said rectangular beam with a condenser lens.
Claim 7
Dependent Claim
24 words
The method of claim 2, wherein said beam modifying step includes transforming said beam to have a rectangular shape and substantially uniform energy density.
Claim 8
Dependent Claim
44 words
The method of claim 6, wherein said transforming step includes, enlarging the diameter of said laser beam with a collimator lens to cause said beam to have substantially uniform energy density; and passing said enlarged diameter beam through an aperture of a field stop.
Claim 9
Dependent Claim
24 words
The method of claim 5, wherein the focal length of said condenser lens is in the range of about 10 to about 15 mm.
References Cited (Backward Citations)
US3941973A
Cited
US4081654A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-29 | 1991-09-28 | 1992-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-29 | 1995-09-28 | 1996-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-29 | 1999-09-28 | 2000-03-29 | $7700.00 | Window Closed / Lapsed |