Patent US5298977A successfully refreshed from Google Patents.
US5298977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Visual inspection method for part mounted on printed circuit board
Assignee: Panasonic Holdings Corp
•
Filing: 1992-10-07
•
Granted: 1994-03-29
•
Expires: 2012-10-07
Abstract
Abstract Three different color light beams which are converged to a single light spot on the surface of a circuit board at predetermined incident angles, are irradiated onto the top surface of an electronic part mounted on the circuit board, then distances between the positions of the top surface of the electronic part to which the light beams are irradiated respectively, from the single light spot on the surface of the circuit board are measured, and the height and an inclined angle of the top surface of the electronic part are computed in accordance with the relationship between the measured distances and the incident angles.
Inventors
- 👤 Keiji Shintani
- 👤 Hiroo Uchiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:38
CPC Classifications
H; H05; H05K; H05K13/00; H05K13/08; H05K13/081; H05K13/0815; H05K13/0817
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
A method of inspecting a circuit board on which an electronic part is mounted, comprising the steps of: directing three light beams having different colors from light sources onto a surface of a circuit board to be inspected at predetermined incident angles so that they are converged to a single light spot; irradiating said three light beams onto an electronic part mounted on said circuit board; measuring distances of positions on said electronic part to which said three light beams are irradiated respectively, from said single light spot on the surface of said circuit board; and computing a height and an inclined angle of said electronic parts in accordance with relationship between said measured distances and said incident angles.
Claim 2
Independent Claim
119 words
A method of inspecting a circuit board on which an electronic part is mounted, comprising the steps of: directing three light beams having different colors from light sources onto a surface of a circuit board to be inspected at predetermined incident angles so that they are converged to a single light spot; irradiating said three light beams onto an electronic part mounted on said circuit board; measuring distances of positions on said electronic part to which said three light beams are irradiated respectively, from said single light spot on the surface of said circuit board; and computing a height and an inclined angle of said electronic parts in accordance with relationship between said measured distances and said incident angles.
Claim 3
Dependent Claim
18 words
A method as set forth in claim 1, wherein said light sources are arranged along one straight line.
Claim 4
Dependent Claim
20 words
A method as set forth in claim 2, wherein said three light beams are irradiated in a line spot-like shape.
Claim 5
Dependent Claim
18 words
A method as set forth in claim 1, wherein said light beams are irradiated in a spot-like shape.
Claim 6
Dependent Claim
19 words
A method as set forth in claim 1, wherein said light sources are arranged at apices of a triangle.
Claim 7
Independent Claim
130 words
A method of inspecting a circuit board on which as electronic part is mounted, comprising the steps of: directing three light beams having different colors from light sources onto a surface of a circuit board to be inspected at predetermined incident angles so that they are converged to a single light spot; irradiating said three light beams onto a surface of a solder filler part of an electronic part mounted on said circuit board; measuring distances of positions on the surface of said fillet solder part to which said three light beams are irradiated respectively, from said single light spot on the surface of said circuit board; and computing a configuration of the surface of said solder fillet part in accordance relationship between said measured distances and said incident angles.
Claim 8
Independent Claim
130 words
A method of inspecting a circuit board on which as electronic part is mounted, comprising the steps of: directing three light beams having different colors from light sources onto a surface of a circuit board to be inspected at predetermined incident angles so that they are converged to a single light spot; irradiating said three light beams onto a surface of a solder filler part of an electronic part mounted on said circuit board; measuring distances of positions on the surface of said fillet solder part to which said three light beams are irradiated respectively, from said single light spot on the surface of said circuit board; and computing a configuration of the surface of said solder fillet part in accordance relationship between said measured distances and said incident angles.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-03-28 | 1997-09-27 | 1998-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-28 | 2001-09-27 | 2002-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-28 | 2005-09-27 | 2006-03-29 | $7700.00 | Window Closed / Lapsed |