US4839497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling apparatus and method
Assignee: Hewlett Packard Development Co LP
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Filing: 1987-09-03
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Granted: 1989-06-13
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Expires: 2007-09-03
Abstract
Abstract An apparatus and method for drilling holes in printed wiring boards formed of a plurality materials wherein two or more laser beams are combined along a common path and preferably focussed on the desired drilling site. The wavelengths of the lasers are selected such that they are each rapidly absorbed and therefor vaporized at least one of said materials. The laser beams are preferably focussed by a beam combining mirror. The lasers can be controlled to provide simultaneous or sequential emission of the laser beams.
Inventors
- 👤 Nott G. Sankar
- 👤 Victor T. Pileeki
- 👤 George A. Zahaykevich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:54
CPC Classifications
B; B23; B23K; B23K26/00; B23K26/02; B23K26/06; B23K26/0604; B23K26/0613; B23K26/36; B23K26/38; B23K26/382; B23K26/40; H; H05; H05K; H05K3/00; H05K3/0011; H05K3/0017; H05K3/0026; H05K3/0032; H05K3/0038; B23K2103/00; B23K2103/16; B23K2103/166; B23K2103/172; B23K2103/30; B23K2103/42; B23K2103/50; B23K2103/52; H05K2203/00; H05K2203/10; H05K2203/107; H05K2203/108
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
80 words
A method of drilling holes in a printed wiring board which comprises a first material and a second material comprising: generating a first laser beam; generating a second laser beam having a wavelength different from the wavelength of said first laser beam wherein said first laser beam and said second laser beam are selected to maximize vaporization of said first and second materials respectively; and directing said first laser beam and said second laser beam along a common beam path.
Claim 2
Independent Claim
80 words
A method of drilling holes in a printed wiring board which comprises a first material and a second material comprising: generating a first laser beam; generating a second laser beam having a wavelength different from the wavelength of said first laser beam wherein said first laser beam and said second laser beam are selected to maximize vaporization of said first and second materials respectively; and directing said first laser beam and said second laser beam along a common beam path.
Claim 3
Dependent Claim
28 words
A method of drilling holes in a printed wiring board as in claim 1 further comprising the step of: focussing said directed beams on said printed wiring board.
Claim 4
Dependent Claim
23 words
A method of drilling holes in a printed wiring board as in claim 1 wherein said directed beams are focussed by a lens.
Claim 5
Dependent Claim
21 words
A method of drilling holes in a printed wiring board as in claim 3 wherein said lens is a zinc-selenium lens.
Claim 6
Dependent Claim
25 words
A method of drilling holes in a printed wiring board as in claim 1 wherein said laser beams are directed by a beam combining mirror.
Claim 7
Dependent Claim
26 words
A method of drilling holes in a printed wiring board as in claim 1 wherein said printed wiring board is a copper clad, glass reinforced polymer.
Claim 8
Dependent Claim
24 words
A method of drilling holes in a printed wiring board as in claim 1 wherein said printed wiring board is a kevlar reinforced polymer.
Claim 9
Dependent Claim
32 words
A method of drilling holes in a printed wiring board as in claim 1 further comprising the step of controlling the generation of said first laser beam and said second laser beam.
Claim 10
Dependent Claim
21 words
A method of drilling holes in a printed wiring board as in claim 8 wherein said laser beams are generated simultaneously.
Claim 11
Dependent Claim
21 words
A method of drilling holes in a printed wiring board as in claim 8 wherein said laser beams are generated sequentially.
Claim 12
Dependent Claim
25 words
A method of drilling holes in a printed wiring board as in claim 1 wherein said first laser beam is generated by a ruby laser.
Claim 13
Dependent Claim
25 words
A method of drilling holes in a printed wiring board as in claim 1 wherein said first laser beam is generated by an eximer laser.
Claim 14
Dependent Claim
26 words
A method of drilling holes in a printer wiring board as in claim 1 wherein said second laser beam is generated by a CO 2 laser.
Claim 15
Dependent Claim
25 words
A method of drilling holes in a printed wiring board as in claim 1 wherein said second laser beam is generated by a YAG laser.
Claim 16
Dependent Claim
37 words
A method of drilling holes in a printed wiring board as in claim 1 wherein said first laser beam is generated by a ruby laser and said second laser beam is generated by a CO 2 laser.
Claim 17
Dependent Claim
25 words
A method of drilling holes in a printed wiring board as in claim 15 wherein said laser beams are directed by a beam combining mirror.
Claim 18
Dependent Claim
33 words
A method of drilling holes in a printed wiring board as in claim 16 wherein said beam combining mirror substantially reflects said ruby laser beam and substantially transmits said CO 2 laser beam.
Claim 19
Dependent Claim
27 words
A method of drilling holes in a printed wiring board as in claim 1 wherein said printed wiring board is a glass reinforced epoxy clad with copper.
Claim 20
Dependent Claim
27 words
A method of drilling holes in a printed wiring board as in claim 1 wherein said printed wiring board is a glass reinforced polyimide clad with copper.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |