US3734628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for detecting surface defects of moving bodies
Assignee: JFE Engineering Corp
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Filing: 1971-11-12
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Granted: 1973-05-22
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Expires: 1991-11-12
Abstract
Abstract In a method of detecting a surface defect of a moving body deposited with non-uniformly distributed oil films wherein the surface of the moving body is scanned with light, the light reflected by the surface is converted into an electrical signal, and the electrical signal exceeding a predetermined level is derived out as a defect signal the improvement wherein, a scanning light of a wavelength having a high transmissibility for the oil film is formed, a uniform film of the oil is applied on the surface of the moving body, and the surface coated with the uniform thickness of oil film is scanned with the high transmissibility scanning light.
Inventors
- 👤 K Michishita
- 👤 Y Okami
- 👤 T Emura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:01
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
119 words
In a method of detecting a surface defect of a moving body wherein the surface of a moving body deposited with non-uniformly distributed oil films such as skin pass oil or rust preventing oil is scanned with light, the light reflected by said surface is converted into an electrical signal, and the electrical signal exceeding a predetermined level is derived out as a defect signal, the improvement which comprises the steps of producing a scanning light within a predetermined range of wavelengths having a high transmissibility for said oil film, applying a uniform film of said oil on the surface of said moving body, and scanning said surface coated with said uniform film of oil with said scanning light.
Claim 2
Dependent Claim
119 words
In a method of detecting a surface defect of a moving body wherein the surface of a moving body deposited with non-uniformly distributed oil films such as skin pass oil or rust preventing oil is scanned with light, the light reflected by said surface is converted into an electrical signal, and the electrical signal exceeding a predetermined level is derived out as a defect signal, the improvement which comprises the steps of producing a scanning light within a predetermined range of wavelengths having a high transmissibility for said oil film, applying a uniform film of said oil on the surface of said moving body, and scanning said surface coated with said uniform film of oil with said scanning light.
Claim 3
Dependent Claim
15 words
The method according to claim 1 comprising detecting a surface defect of a metal strip.
Claim 4
Dependent Claim
18 words
The method according to claim 1 comprising passing a light through a filter to produce said scanning light.
Claim 5
Dependent Claim
23 words
The method according to claim 1 comprising producing a scanning light having a wavelength within the range of 4 to 6 Mu .
Claim 6
Dependent Claim
134 words
In an apparatus for detecting a surface defect of a moving body deposited with non-uniformly distributed oil films such as skin pass oil or rust preventing oil wherein a said surface is scanned with light, the light reflected by said surface is converted into an electrical signal, the improvement which comprises means for producing a scanning light within a predetermined range of wavelengths having a high transmissibility for said oil film, means for applying a uniform film of said oil on the entire surface of said moving body, means for scanning said surface coated with said uniform oil film with said scanning light, and a photoelectric converter disposed to receive said scanning light reflected by said scanned coated surface for producing an electrical signal representing the condition of the surface of said moving body.
Claim 7
Dependent Claim
134 words
In an apparatus for detecting a surface defect of a moving body deposited with non-uniformly distributed oil films such as skin pass oil or rust preventing oil wherein a said surface is scanned with light, the light reflected by said surface is converted into an electrical signal, the improvement which comprises means for producing a scanning light within a predetermined range of wavelengths having a high transmissibility for said oil film, means for applying a uniform film of said oil on the entire surface of said moving body, means for scanning said surface coated with said uniform oil film with said scanning light, and a photoelectric converter disposed to receive said scanning light reflected by said scanned coated surface for producing an electrical signal representing the condition of the surface of said moving body.
Claim 8
Dependent Claim
21 words
The apparatus according to claim 5 wherein said means for producing said scanning light comprises a light source and a filter.
Claim 9
Dependent Claim
18 words
The apparatus according to claim 5 wherein said means for applying said oil film comprises a squeeze roller.
Claim 10
Dependent Claim
18 words
The apparatus according to claim 5 wherein said means for applying said oil film comprises oil spray nozzles.
Claim 11
Dependent Claim
30 words
The apparatus according to claim 5 wherein said means for producing a scanning light produces a scanning light having a wavelength within the range of 4 to 6 Mu .
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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |