JPS5590190A - Defect detector - Google Patents
Defect detectorInfo
- Publication number
- JPS5590190A JPS5590190A JP16228778A JP16228778A JPS5590190A JP S5590190 A JPS5590190 A JP S5590190A JP 16228778 A JP16228778 A JP 16228778A JP 16228778 A JP16228778 A JP 16228778A JP S5590190 A JPS5590190 A JP S5590190A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- defect
- binary
- inspected object
- comp
- 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
Abstract
PURPOSE: To detect with high precision the existence of a defect on the surface of an inspected object by coding accurately a fine defect signal into a binary signal by comparing a pickup signal with different fixed threshold levels.
CONSTITUTION: An inspected object irradiated uniformly is picture-taken by pickup unit TV such as a television camera and its pickup signal is coded into a binary signal by comparators COMP1∼COMPn differing in fixed threshold level. Next, the binary-coded signal is inputted to one terminal of OR circuit OG by way of FF1∼FFn counting pulses and NAND circuits NG1∼NGn, and the output of comparator COMP0 is led to the other terminal. As a result, when no defect resides on the surface of the inspected object, OR circuit OG generates only one pulse, but when a defect exists, it outputs not less than two pulses. In this way, a fine defect signal can also be code into a binary signal and, therefore, a fine defect can be detected with high precision.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16228778A JPS5590190A (en) | 1978-12-27 | 1978-12-27 | Defect detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16228778A JPS5590190A (en) | 1978-12-27 | 1978-12-27 | Defect detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5590190A true JPS5590190A (en) | 1980-07-08 |
Family
ID=15751610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16228778A Pending JPS5590190A (en) | 1978-12-27 | 1978-12-27 | Defect detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5590190A (en) |
-
1978
- 1978-12-27 JP JP16228778A patent/JPS5590190A/en active Pending
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