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 Title: |
US3976383:
Visual method of locating faults in printed circuit boards
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Olsen, Oliver Albert; Old Bridge, NJ
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| Assignee: |
The Bendix Corporation, Teterboro, NJ
other patents from BENDIX CORPORATION(NOW ALLIED-SIGNAL INC.) (59445) (approx. 2,841)
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| Published / Filed: |
1976-08-24
/ 1975-02-28
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| Application Number: |
US1975000553943
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| IPC Code: |
Advanced:
G01N 21/88;
G01R 31/28;
G01R 31/309;
Core:
more...
IPC-7:
G01B 9/08;
G01N 21/16;
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| ECLA Code: |
G01N21/88B; G01R31/28B4; G01R31/309;
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| U.S. Class: |
Current:
356/393;
356/237.5;
356/394;
Original:
356/166;
356/168;
356/237;
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| Field of Search: |
356/164,165,166,168,237
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| Priority Number: |
| 1975-02-28 |
US1975000553943 |
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| Abstract: |
A method of visually detecting defects in a printed circuit board comprising preparing a mask with a light blocking pattern corresponding to the desired printed circuit, illuminating the printed circuit board through the mask with the light of a color complimentary to the color of the printed circuit board and with the light blocking pattern in registry with the printed circuit and inspecting the printed circuit board for light reflected from defects in the printed circuit not present in the light blocking pattern on the mask. The defects are readily apparent as bright spots on a dark background.
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| Attorney, Agent or Firm: |
Cuoco, Anthony F. ;
Hartz, S. H. ;
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| Primary / Asst. Examiners: |
McGraw, Vincent P.;
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| Family: |
None
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First Claim:
Show all 7 claims |
What is claimed is:
1. A method of visually detecting defects in a printed circuit on a printed circuit board, comprising preparing a mask with a light blocking pattern corresponding to the desired printed circuit, illuminating the printed circuit board through the mask with a light of a color complimentary to the color of the printed circuit board and with the light blocking pattern in registry with the printed circuit, and inspecting the printed circuit board for light reflected from defects in the printed circuit not present in the light blocking pattern on the mask.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
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| Description: |
Show description
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| Forward References: |
Show 8 U.S. patent(s) that reference this one
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