JPS6443746A - Through hole inspecting method for printed wiring board - Google Patents
Through hole inspecting method for printed wiring boardInfo
- Publication number
- JPS6443746A JPS6443746A JP20062187A JP20062187A JPS6443746A JP S6443746 A JPS6443746 A JP S6443746A JP 20062187 A JP20062187 A JP 20062187A JP 20062187 A JP20062187 A JP 20062187A JP S6443746 A JPS6443746 A JP S6443746A
- Authority
- JP
- Japan
- Prior art keywords
- hole
- transmitted
- light
- printed wiring
- wiring board
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/956—Inspecting patterns on the surface of objects
- G01N21/95692—Patterns showing hole parts, e.g. honeycomb filtering structures
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
PURPOSE:To speedily and securely inspect a through hole defect by allowing slight light which is transmitted through a printed wiring board to reach a defect position of a through hole inner peripheral wall where the surface is not plated with copper and inspecting the light visually. CONSTITUTION:A positive film 4 which cuts off transmitted light from only a through hole 1 including a land as an area to be inspected is arranged on the reverse surface of the printed wiring board 3 whose through hole 1 is plated with copper 2. Further, a negative film 5 which cuts off transmitted light except from the through hole 1 including the land as the area to be inspected is arranged on the top surface of the board 3. Then it is confirmed visually that the slight light which is transmitted through the board 3 from below reaches the defect position 6 where the inner peripheral wall of the through hole 1 is not plated with the copper 2. In this case, the transmitted light is the slight light transmitted through the board 3, so it is no glaring and the defect is easy to inspected, so that the inspection is performed speedily and securely.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20062187A JPS6443746A (en) | 1987-08-11 | 1987-08-11 | Through hole inspecting method for printed wiring board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20062187A JPS6443746A (en) | 1987-08-11 | 1987-08-11 | Through hole inspecting method for printed wiring board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6443746A true JPS6443746A (en) | 1989-02-16 |
Family
ID=16427421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20062187A Pending JPS6443746A (en) | 1987-08-11 | 1987-08-11 | Through hole inspecting method for printed wiring board |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6443746A (en) |
-
1987
- 1987-08-11 JP JP20062187A patent/JPS6443746A/en active Pending
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