US4634281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the inspection of continuous sheets of material
Assignee: Lasor Laser Sorter GmbH
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Filing: 1984-10-24
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Granted: 1987-01-06
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Expires: 2004-10-24
Abstract
Abstract The inspection for surface deformation of flat glass is carried out by the flying-spot method wherein the beam of light is thrown by a rotating mirror 13 onto a folding mirror 6 which reflects the light onto the continuous sheet of glass 2 to be inspected. The reflected light beam 4 strikes a light-diffusing plate 1 disposed ahead of the receiver 11. The area of the light-diffusing plate 1 on which the beam of light impinges when the sheet of glass 2 is free of defects is opaque. On this opaque area there are disposed in a spaced relationship two photodiodes 7 between which a light bar formed by the scanning light beam extends. When the thickness of the flat glass 2 varies gradually, light will strike one of the photodiodes 7. The pulse so triggered controls a tracking mechanism 50 which adjusts the folding mirror 6 so that the light bar again extends between the photodiodes 7.
Inventors
- 👤 Peter Eikmeyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:25
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89; G01N21/892; G01N21/896
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
197 words
Apparatus for the inspection of a continuous sheet of a light-transmissive material which may have defects comprising: a light source for supplying a light beam; first and second movable mirror means, said first movable mirror means being associated with said light source for directing a beam of light to said second movable mirror means for reflecting the light beam onto the sheet of material to be inspected; receiver means for receiving the reflected light comprising a plurality of light-responsive transducer means and a housing including light-diffusing means; the reflected light beam falling on an opaque area of said light-diffusing means, when the continuous sheet of material is free of defects; at least one of said light-responsive transducer means being disposed with respect to said reflected light beam after said light-diffusing means and forming a defect-detecting transducer; a plurality of said light-responsive transducer means being spaced relative to each other in the direction of travel of the continuous sheet of material within said opaque area of said light-diffusing means; and control means responsive to said transducer means located within said opaque area for re-positioning said second mirror means in response to gradual thickness changes of the light-transmissive material.
Claim 2
Dependent Claim
197 words
Apparatus for the inspection of a continuous sheet of a light-transmissive material which may have defects comprising: a light source for supplying a light beam; first and second movable mirror means, said first movable mirror means being associated with said light source for directing a beam of light to said second movable mirror means for reflecting the light beam onto the sheet of material to be inspected; receiver means for receiving the reflected light comprising a plurality of light-responsive transducer means and a housing including light-diffusing means; the reflected light beam falling on an opaque area of said light-diffusing means, when the continuous sheet of material is free of defects; at least one of said light-responsive transducer means being disposed with respect to said reflected light beam after said light-diffusing means and forming a defect-detecting transducer; a plurality of said light-responsive transducer means being spaced relative to each other in the direction of travel of the continuous sheet of material within said opaque area of said light-diffusing means; and control means responsive to said transducer means located within said opaque area for re-positioning said second mirror means in response to gradual thickness changes of the light-transmissive material.
Claim 3
Dependent Claim
31 words
Apparatus according to claim 1, in which said control means includes tracking means for re-positioning said second mirror means, said tracking means comprising an electric motor and an extremely geared-down transmission.
Claim 4
Dependent Claim
16 words
Apparatus according to claim 1, in which said control means comprises a three-level action closed loop.
Claim 5
Dependent Claim
28 words
Apparatus according to claim 1, in which said light-diffusing means comprises an opaque sheet applied to a light-diffusing plate as a stop for blocking the reflected light beam.
Claim 6
Dependent Claim
18 words
Apparatus according to claim 4, in which the position of said stop on said light-diffusing plate is adjustable.
Claim 7
Dependent Claim
43 words
Apparatus according to claim 1, in which said second mirror means comprises a folding mirror of the optical path and said light-responsive transducer means located in said opaque area provide signals having amplitudes representing a measure for the re-positioning of the folding mirror.
Claim 8
Dependent Claim
13 words
Apparatus according to claim 1, in which said light source comprises a laser.
Claim 9
Dependent Claim
16 words
Apparatus according to claim 1, in which said first movable mirror means comprises a rotatable mirror.
Claim 10
Dependent Claim
19 words
Apparatus according to claim 1, in which said two transducers means located in said opaque area comprise two photodiodes.
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) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |