Patent US5493077A successfully refreshed from Google Patents.
US5493077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed wiring board having a blind via
Assignee: Ibiden Co Ltd
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Filing: 1994-11-22
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Granted: 1996-02-20
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Expires: 2014-11-22
Abstract
Abstract Disclosed is a printed wiring board 1 with a through hole 5 in which a hollow portion 7 wider than both an upper opening 5A and a lower opening 5A is formed, and a solder resist film 9 is formed at the hollow portion 7 so as to firmly adhere to an inner wall of the through hole 5. Thereby, it can prevent the solder resist film 9 from being dropped out from the through hole 5 and electrical check of circuit patterns on the printed wiring board 1 can be efficiently conducted while directly setting a checker pin 13 of a checker into the through hole 5.
Inventors
- 👤 Akihiro Demura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:16
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/0094; H05K3/40; H05K3/42; H05K1/00; H05K1/02; H05K1/0266; H05K1/0268; H05K2201/00; H05K2201/09; H05K2201/09209; H05K2201/095; H05K2201/0959; H05K2201/09818; H05K2201/09827; H05K2203/00; H05K2203/07; H05K2203/0756; H05K2203/0759; H05K3/30; H05K3/32; H05K3/34; H05K3/3452
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
88 words
A printed wiring board having a board, a penetration hole formed in the board in which a conductive layer is formed on an inner wall of the penetration hole and on both an upper and a lower peripheries of the penetration hole to form a through hole, the printed wiring board comprising: a film, mainly composed of photosensitive resin, located in the through hole and adhered only at a substantially central position of an inner wall in the through hole, so that the film blinds the through hole.
Claim 2
Dependent Claim
88 words
A printed wiring board having a board, a penetration hole formed in the board in which a conductive layer is formed on an inner wall of the penetration hole and on both an upper and a lower peripheries of the penetration hole to form a through hole, the printed wiring board comprising: a film, mainly composed of photosensitive resin, located in the through hole and adhered only at a substantially central position of an inner wall in the through hole, so that the film blinds the through hole.
Claim 3
Dependent Claim
58 words
The printed wiring board according to claim 1, wherein a diameter of the through hole at the central position is wider than both an upper opening of the through hole positioned on an upper side of the printed wiring board and a lower opening of the through hole positioned on a lower side of the printed wiring board.
Claim 4
Dependent Claim
25 words
The printed wiring board according to claim 2, wherein the film is formed at the central position of an inner wall in the through hole.
Claim 5
Dependent Claim
22 words
The printed wiring board according to claim 1, wherein the film is formed from liquid composition including photosensitive resin and thermosetting resin.
Claim 6
Dependent Claim
32 words
The printed wiring board according to claim 4, wherein the liquid composition is solder resist composition which is utilized for forming solder resist films on both sides of the printed wiring board.
Claim 7
Dependent Claim
32 words
The printed wiring board according to claim 3, wherein the printed wiring board has a circuit pattern on the upper side thereof, the circuit pattern including lands for mounting electric components thereon.
Claim 8
Dependent Claim
29 words
The printed wiring board according to claim 6, wherein the film is figured in an arc shape which is projected toward the upper side of the printed wiring board.
Claim 9
Dependent Claim
17 words
The printed wiring board according to claim 6, wherein the film is figured in a flat shape.
Claim 10
Dependent Claim
29 words
The printed wiring board according to claim 6, wherein the film is figured in an arc shape which is projected toward the lower side of the printed wiring board.
Claim 11
Dependent Claim
40 words
The printed wiring board according to claim 1, wherein the through hole is figured in a tapered hole with an opening area which gradually becomes narrower from an upper side of the printed wiring board toward a lower side thereof.
Claim 12
Dependent Claim
32 words
The printed wiring board according to claim 10, wherein the printed wiring board has a circuit pattern on the upper side thereof, the circuit pattern including lands for mounting electric components thereon.
Claim 13
Dependent Claim
29 words
The printed wiring board according to claim 11, wherein the film is figured in an arc shape which is projected toward the upper side of the printed wiring board.
Claim 14
Dependent Claim
17 words
The printed wiring board according to claim 11, wherein the film is figured in a flat shape.
Claim 15
Dependent Claim
29 words
The printed wiring board according to claim 11, wherein the film is figured in an arc shape which is projected toward the lower side of the printed wiring board.
Claim 16
Dependent Claim
40 words
The printed wiring board according to claim 1, wherein the through hole is figured in a straight hole with an opening area which is equal on both an upper side of the printed wiring board and a lower side thereof.
Claim 17
Dependent Claim
32 words
The printed wiring board according to claim 15, wherein the printed wiring board has a circuit pattern on the upper side thereof, the circuit pattern including lands for mounting electric components thereon.
Claim 18
Dependent Claim
29 words
The printed wiring board according to claim 16, wherein the film is figured in an arc shape which is projected toward the upper side of the printed wiring board.
Claim 19
Dependent Claim
17 words
The printed wiring board according to claim 16, wherein the film is figured in a flat shape.
Claim 20
Dependent Claim
29 words
The printed wiring board according to claim 16, wherein the film is figured in an arc shape which is projected toward the lower side of the printed wiring board.
References Cited (Backward Citations)
JPH02144988A
Cited
US5387493A
Cited
US5113315A
Cited
JPH04328894A
Cited
JPH05273760A
Cited
US5342999A
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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) | 1999-02-19 | 1999-08-21 | 2000-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-19 | 2003-08-21 | 2004-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-19 | 2007-08-21 | 2008-02-20 | $7700.00 | Window Closed / Lapsed |