US3825351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic surface inspection device for running object
Assignee: Nippon Steel Nisshin Co Ltd
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Filing: 1973-01-19
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Granted: 1974-07-23
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Expires: 1993-01-19
Abstract
Abstract A device for automatically detecting defects on the surface of a running flat object by optically scanning the surface and converting the presence of the defects into variations in electrical signals, characterized in that the configuration of an optical system associated with the device is adapted to be changed as desired without changing the characteristics of the optical system.
Inventors
- 👤 T Seki
- 👤 S Kawamura
- 👤 I Maeda
- 👤 A Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 21:39
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89; G01N21/8901
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
217 words
A device for automatic inspection of the surface of a running object comprising a pair of parabolic mirrors opposed to each other, each having a straight vertical section and a parabolic horizontal section, a polyhedral rotary mirror having a plurality of faces for reflecting and radiating a laser beam in a number of directions, said pair of parabolic mirrors being placed above a planar object to be inspected, said polyhedral rotary mirror being positioned at the focal point of one of said parabolic mirrors, said flat object being scanned by said laser beam in a straight line in a transverse direction to the direction of feed of said flat object after being reflected by said one parabolic mirror, and light receiving means for receiving and detecting said laser beam including flaw signals from the surface of the running object after being reflected by the other of said parabolic mirrors, said light receiving means being positioned at the focal point of the other of said parabolic mirrors, the longitudinal axes of said parabolic mirrors and the face of said polyhedral mirror being tilted at the same angle to the perpendicular axis of said flat running object thereby to change the configuration of the optical system as desired without affecting in any way the characteristics of the optical system.
Claim 2
Independent Claim
217 words
A device for automatic inspection of the surface of a running object comprising a pair of parabolic mirrors opposed to each other, each having a straight vertical section and a parabolic horizontal section, a polyhedral rotary mirror having a plurality of faces for reflecting and radiating a laser beam in a number of directions, said pair of parabolic mirrors being placed above a planar object to be inspected, said polyhedral rotary mirror being positioned at the focal point of one of said parabolic mirrors, said flat object being scanned by said laser beam in a straight line in a transverse direction to the direction of feed of said flat object after being reflected by said one parabolic mirror, and light receiving means for receiving and detecting said laser beam including flaw signals from the surface of the running object after being reflected by the other of said parabolic mirrors, said light receiving means being positioned at the focal point of the other of said parabolic mirrors, the longitudinal axes of said parabolic mirrors and the face of said polyhedral mirror being tilted at the same angle to the perpendicular axis of said flat running object thereby to change the configuration of the optical system as desired without affecting in any way the characteristics of the optical system.
Claim 3
Dependent Claim
45 words
A device as defined in claim 1 wherein the longitudinal axis of one of said parabolic mirrors and the face of said polyhedral rotary mirror are tilted in the same direction at an angle of 15* to the perpendicular axis of said flat running object.
Claim 4
Dependent Claim
16 words
A device as defined in claim 2 wherein said parabolic mirrors face said flat running object.
Claim 5
Dependent Claim
18 words
A device as defined in claim 2 wherein said parabolic mirrors face away from said flat running object.
Claim 6
Independent Claim
188 words
A device for automatic inspection of the surface of a running flat object comprising a parabolic mirror having a straight vertical section and a parabolic horizontal section, a polyhedral rotary mirror having a plurality of faces for reflecting and radiating a laser beam in a number of directions, which is positioned at the focal point of said parabolic mirror, said flat object being scanned in a straight line in a transverse direction to the direction of feed of said flat object by the laser beam reflected by said parabolic mirror, and light receiving means for receiving and detecting said laser beam including flaw signals on the surface of the running object after being again reflected by said parabolic mirror, said light receiving means being positioned at the focal point of the parabolic mirror, in which the longitudinal axis of said parabolic mirror and the face of said polyhedral rotary mirror are tilted at the same angle to the perpendicular axis of said flat running flat object thereby to change the configuration of the optical system as desired without affecting in any way the characteristic of the optical system.
Claim 7
Independent Claim
188 words
A device for automatic inspection of the surface of a running flat object comprising a parabolic mirror having a straight vertical section and a parabolic horizontal section, a polyhedral rotary mirror having a plurality of faces for reflecting and radiating a laser beam in a number of directions, which is positioned at the focal point of said parabolic mirror, said flat object being scanned in a straight line in a transverse direction to the direction of feed of said flat object by the laser beam reflected by said parabolic mirror, and light receiving means for receiving and detecting said laser beam including flaw signals on the surface of the running object after being again reflected by said parabolic mirror, said light receiving means being positioned at the focal point of the parabolic mirror, in which the longitudinal axis of said parabolic mirror and the face of said polyhedral rotary mirror are tilted at the same angle to the perpendicular axis of said flat running flat object thereby to change the configuration of the optical system as desired without affecting in any way the characteristic of the optical system.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |