US4965208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inspection of multipattern circuit boards
Assignee: Nokia Bell Labs
•
Filing: 1988-01-19
•
Granted: 1990-10-23
•
Expires: 2008-01-19
Abstract
Abstract Circuit boards with advantageous properties are produced through the addition of a fluorescent dye. The presence of the dye allows an expeditious inspection of the metallic pattern on the circuit board by induced fluorescence. If the circuit board is two-sided, to maintain the effectiveness of the dye, a material such as a light scattering composition is added to the circuit board substrate.
Inventors
- 👤 Frank H. Blitchington
- 👤 Edwin A. Chandross
- 👤 Lloyd Shepherd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:23
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/28; G01R31/302; G01R31/308; G01R31/309; C; C09; C09K; C09K11/00; C09K11/06; H; H05; H05K; H05K1/00; H05K1/02; H05K1/0266; H05K1/0269; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0373; H05K2203/00; H05K2203/12; H05K2203/122; H05K2203/16; H05K2203/161; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31529
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
161 words
A patterned substrate comprising a first metal pattern overlying a substrate and a second metal pattern on the side of said substrate opposing said overlying metal pattern wherein the thickness of said substrate is less than about 1.25 mm and said substrate includes a light scattering medium, and said substrate further includes a dye capable of fluorescing upon interacting with light, wherein said dye is distributed in regions of said substrate underlying or overlying said first metal pattern and said second metal pattern, and wherein said dye has a chemical structure represented by a member chosen from the group consisting of (1) ##STR3## and (2) ##STR4## where Y is SO 3 G, (G is an alkali metal cation), or H, R 1 and R 2 are individually hydrogen, methyl, or ethyl, and R 3 is a lower alkyl, p-tolyl, xylyl, or hydrogen, and Z - is Cl - , Br - , I - , NO 3 - , or p-toluenesulfonate.
Claim 2
Dependent Claim
161 words
A patterned substrate comprising a first metal pattern overlying a substrate and a second metal pattern on the side of said substrate opposing said overlying metal pattern wherein the thickness of said substrate is less than about 1.25 mm and said substrate includes a light scattering medium, and said substrate further includes a dye capable of fluorescing upon interacting with light, wherein said dye is distributed in regions of said substrate underlying or overlying said first metal pattern and said second metal pattern, and wherein said dye has a chemical structure represented by a member chosen from the group consisting of (1) ##STR3## and (2) ##STR4## where Y is SO 3 G, (G is an alkali metal cation), or H, R 1 and R 2 are individually hydrogen, methyl, or ethyl, and R 3 is a lower alkyl, p-tolyl, xylyl, or hydrogen, and Z - is Cl - , Br - , I - , NO 3 - , or p-toluenesulfonate.
Claim 3
Dependent Claim
14 words
The patterned substrate of claim 1 wherein said light scattering medium comprises titanium dioxide.
Claim 4
Dependent Claim
14 words
The patterned substrate of claim 1 wherein said substrate comprises a cured epoxy resin.
Claim 5
Dependent Claim
15 words
The patterned substrate of claim 3 wherein said dye is chemically bound to said substrate.
Claim 6
Dependent Claim
14 words
The patterned substrate of claim 4 wherein said light scattering medium comprises titanium dioxide.
Claim 7
Dependent Claim
20 words
The patterned substrate of claim 4 wherein said first metal pattern and said second metal pattern comprise copper metal patterns.
Claim 8
Dependent Claim
34 words
The patterned substrate of claim 1 wherein said dye denominated (1) is employed where R 1 , R 2 and R 3 are hydrogen and where said dye is reacted with bisphenol-A diglycidyl ether.
Claim 9
Dependent Claim
195 words
A process for detecting flaws in a first metal pattern which is formed on a substrate that has a second metal pattern on the side of said substrate opposing said metal pattern comprising the steps of illuminating said substrate with a source of electromagnetic radiation, detecting the resulting fluorescence from said substrate, and further processing said substrate on the basis of said detection wherein the thickness of said substrate is less than about 1.25 mm and said substrate includes a electromagnetic radiation scattering medium, and said substrate includes a dye capable of fluorescing, wherein said dye is distributed in regions of said substrate underlying or overlying said first metal pattern and said second metal pattern, and wherein said dye comprises a material having a chemical structure represented by a member chosen from the group consisting of (1) ##STR5## and (2) ##STR6## where Y is SO 3 G or hydrogen, G is an alkali metal cation, R 1 and R 2 are individually hydrogen, methyl, or ethyl, and R 3 is a lower alkyl, p-tolyl, xylyl, or hydrogen, and Z - is Cl - , Cr - , I - , NO 3 - or p-toluenesulfonate.
Claim 10
Dependent Claim
195 words
A process for detecting flaws in a first metal pattern which is formed on a substrate that has a second metal pattern on the side of said substrate opposing said metal pattern comprising the steps of illuminating said substrate with a source of electromagnetic radiation, detecting the resulting fluorescence from said substrate, and further processing said substrate on the basis of said detection wherein the thickness of said substrate is less than about 1.25 mm and said substrate includes a electromagnetic radiation scattering medium, and said substrate includes a dye capable of fluorescing, wherein said dye is distributed in regions of said substrate underlying or overlying said first metal pattern and said second metal pattern, and wherein said dye comprises a material having a chemical structure represented by a member chosen from the group consisting of (1) ##STR5## and (2) ##STR6## where Y is SO 3 G or hydrogen, G is an alkali metal cation, R 1 and R 2 are individually hydrogen, methyl, or ethyl, and R 3 is a lower alkyl, p-tolyl, xylyl, or hydrogen, and Z - is Cl - , Cr - , I - , NO 3 - or p-toluenesulfonate.
Claim 11
Dependent Claim
12 words
The process of claim 7 wherein said scattering medium comprises titanium dioxide.
Claim 12
Dependent Claim
13 words
The process of claim 7 wherein said substrate comprises a cured epoxy resin.
Claim 13
Dependent Claim
14 words
The process of claim 9 wherein said dye is chemically bound to said substrate.
Claim 14
Dependent Claim
12 words
The process of claim 10 wherein said scattering medium comprises titanium dioxide.
Claim 15
Dependent Claim
19 words
The process of claim 10 wherein said first metal pattern and said second metal pattern comprise copper metal patterns.
Claim 16
Dependent Claim
33 words
The process of claim 7 wherein said dye denominated (1) is employed, where R 1 , R 2 and R 3 are hydrogen and where said dye is reacted with bisphenol-A diglycidyl ether.
References Cited (Backward Citations)
US4152723A
Cited
US4774188A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-22 | 1994-04-23 | 1994-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-22 | 1998-04-23 | 1998-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-22 | 2002-04-23 | 2002-10-23 | $7700.00 | Window Closed / Lapsed |