US3889383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of machining printed-circuit boards and/or working patterns for such printed-circuit boards
Assignee: Siemens AG
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Filing: 1973-09-25
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Granted: 1975-06-17
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Expires: 1993-09-25
Abstract
Abstract A method of minimizing errors in the machining of printedcircuit boards, machining patterns, printing tools or the like is disclosed. First, the variations of the actual or basic grid of the existing printed-circuit board or the like from a given theoretical reference grid are determined; thereafter, the reference point of the machining operations is selected on the basis of said variations such that the actual variation between actual and theoretical reference grid is minimal.
Inventors
- 👤 Alfred Jahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:53
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/0008; H05K2203/00; H05K2203/05; H05K2203/0548; H05K2203/056; H05K3/0011; H05K3/0044; H05K3/0047
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
209 words
A method of machining printed circuit boards wherein each desired site of a machining operation is located on one of a plurality of fixed points in an actual machining pattern, said fixed point being located with respect to a theoretical grid crossing point of a reference grid system established for each said printed circuit board, said board reference grid being initially congruent with the reference placement grid of a machining device on which are to be located the actual sites of the machining operations of said device, comprising determining the deviation in terms of direction and numerical value in one coordinate direction of each desired machining pattern site in a row with respect to a row of said theoretical reference crossing points on said printed circuit board reference grid; selecting one of said desired points as the basic reference point for locating said machining operation relative to said machining device reference placement grid, shifting said selected basic reference point and the corresponding crossing point of said printed circuit reference grid relative to said machining device tool placement grid to minimize the variation between each of said desired points to be adopted as a machining site and the corresponding grid row crossing point of said machining device reference placement grid.
Claim 2
Independent Claim
209 words
A method of machining printed circuit boards wherein each desired site of a machining operation is located on one of a plurality of fixed points in an actual machining pattern, said fixed point being located with respect to a theoretical grid crossing point of a reference grid system established for each said printed circuit board, said board reference grid being initially congruent with the reference placement grid of a machining device on which are to be located the actual sites of the machining operations of said device, comprising determining the deviation in terms of direction and numerical value in one coordinate direction of each desired machining pattern site in a row with respect to a row of said theoretical reference crossing points on said printed circuit board reference grid; selecting one of said desired points as the basic reference point for locating said machining operation relative to said machining device reference placement grid, shifting said selected basic reference point and the corresponding crossing point of said printed circuit reference grid relative to said machining device tool placement grid to minimize the variation between each of said desired points to be adopted as a machining site and the corresponding grid row crossing point of said machining device reference placement grid.
Claim 3
Dependent Claim
89 words
The method as set forth in claim 1, wherein for each shift of the machining site in a second coordinate direction to another of said fixed points located relative to a second row of reference grid crossing points, said steps of determining, selecting and shifting are repeated for said fixed points in said second row relative to said theoretical row of grid crossing points to reduce variation between said fixed points in said second row and said machine device reference placement grid separately for each row of fixed points.
Claim 4
Dependent Claim
34 words
The method as set forth in claim 1, characterized by the fact that the selection of said zero reference point takes place through corresponding reference markings located on tools for printing the printed-circuit boards.
References Cited (Backward Citations)
US3686764A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |