US3736065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation sensitive means for detecting optical flaws in glass
Assignee: Eastman Kodak Co
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Filing: 1972-05-09
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Granted: 1973-05-29
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Expires: 1992-05-09
Abstract
Abstract Apparatus for detecting flaws in a continuously moving ribbon of float-formed glass, comprising optical elements constructed and arranged to direct scanning beams of light through the glass ribbon, and which, in combination with associated discriminating means, afford a system which detects discrepancies in the transmission of light in the region of a flaw contained in the glass. In addition to the optical elements, the disclosed apparatus comprises a flaw marking unit and a control unit. Information as to the exact nature and location of marked flaws in the inspected glass may be stored in a computer, in the order of severity of the flaw. The apparatus claimed is particularly adapted to detect ream and wave flaws.
Inventors
- 👤 C J Cushing
- 👤 K C Schwind
- 👤 Neut R D Vander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:13
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89; G01N21/892; G01N21/896
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
178 words
In apparatus for detecting wave and ream defects, and like imperfections, in a sheet of glass as it is moved along a predetermined path, optical means having an optical axis and operable continuously to scan said sheet of glass, comprising: means for optically producing a pair of spaced, outgoing scanning beams from a single source, one for the detection of ream defects and the other for the detection of wave defects; means for optically displacing said spaced scanning beams to direct the latter to one side of the optical axis of said optical means; means for directing said displaced beams through said sheet of glass; means for reflecting said displaced beams for return through said sheet of glass and to the other side of the optical axis of said optical means; means for causing each of said displaced return beams to impinge on suitably disposed photodetectors individual to the beams; and processing circuit means associated with said photodetectors and effective to detect, and distinguish between, disruptions in said light beams as caused by such ream and wave defects.
Claim 2
Dependent Claim
178 words
In apparatus for detecting wave and ream defects, and like imperfections, in a sheet of glass as it is moved along a predetermined path, optical means having an optical axis and operable continuously to scan said sheet of glass, comprising: means for optically producing a pair of spaced, outgoing scanning beams from a single source, one for the detection of ream defects and the other for the detection of wave defects; means for optically displacing said spaced scanning beams to direct the latter to one side of the optical axis of said optical means; means for directing said displaced beams through said sheet of glass; means for reflecting said displaced beams for return through said sheet of glass and to the other side of the optical axis of said optical means; means for causing each of said displaced return beams to impinge on suitably disposed photodetectors individual to the beams; and processing circuit means associated with said photodetectors and effective to detect, and distinguish between, disruptions in said light beams as caused by such ream and wave defects.
Claim 3
Dependent Claim
108 words
Apparatus according to claim 1, and further characterized in that said means for optically producing said outgoing scanning means comprises a source of light; stop means positioned for impingement by said light and including a pair of spaced, generally parallel slit apertures disposed to one side of the optical axis of said system to form a pair of spaced beams; and a scanning mirror rotatable about a pivot on said optical axis and positioned to receive said pair of spaced beams in a region thereof disposed to one side of said pivot, said mirror upon rotation transforming said pair of spaced beams into said spaced, outgoing scanning beams.
Claim 4
Dependent Claim
169 words
Apparatus according to claim 1, and further characterized in that said means for optically producing said spaced scanning beams comprises: means for forming a collimated beam of light; light stop means disposed in said beam of light and including a pair of spaced, generally parallel slits for forming a pair of spaced beams; focusing lens means aligned with said optical axis and interposed in the path of said spaced beams in such position that said beams pass through said lens means to one side of said optical axis; and scanning mirror means positioned to receive light from said focusing lens means, and being mounted for rotation about an axis located on said optical axis; said mirror means and said lens means being further positioned to focus said outgoing beams on said sheet of glass; and said mirror further being positioned for impingement by said return beams to the other side of said optical axis followed by reflection of said return beams through said focusing lens means onto said photodetectors.
Claim 5
Dependent Claim
37 words
Apparatus according to claim 1, and characterized in that said means for producing said scanning beams is effective to displace one of said outgoing beams further from said optical axis than the other of the outgoing beams.
Claim 6
Dependent Claim
92 words
Apparatus according to claim 4 and further characterized in that the path traversed by said one outgoing beam is such that it is reflected back through said glass in a region substantially spaced from its region of its initial passage through the glass, thereby being effective in the detection of ream flaws, and the path traversed by the other of said outgoing beams is such that it is reflected through substantially the same region of glass as it is caused to pass initially, thereby being effective in the detection of wave flaws.
Claim 7
Dependent Claim
31 words
Apparatus according to claim 5 and further characterized in that scanning is effected by a planar, rotational mirror having its center of rotation on the optical axis of the optical means.
Claim 8
Dependent Claim
187 words
Optical means having an optical axis and operable continuously to scan a sheet of glass, in the detection of ream and wave defects, and like imperfections, in such a sheet of glass aS it is moved along a predetermined path, comprising: means for producing a pair of spaced, outgoing scanning beams, one beam for the detection of ream defects and the other beam for the detection of wave defects; means for optically displacing said spaced scanning beams to one side of the optical axis of said optical means; means for directing said displaced beams through said sheet of glass; means for reflecting said displaced beams for return through said sheet of glass and to the other side of the optical axis of said optical means, said one scanning beam and its reflected counterpart being transmitted through said glass at substantially spaced regions of the latter, said other scanning beam and its reflected counterpart being transmitted through said glass in substantially the same regions of the latter; and means for causing each of said displaced return beams to impinge on suitably disposed photodetectors individual to the reflected beams.
Claim 9
Dependent Claim
187 words
Optical means having an optical axis and operable continuously to scan a sheet of glass, in the detection of ream and wave defects, and like imperfections, in such a sheet of glass aS it is moved along a predetermined path, comprising: means for producing a pair of spaced, outgoing scanning beams, one beam for the detection of ream defects and the other beam for the detection of wave defects; means for optically displacing said spaced scanning beams to one side of the optical axis of said optical means; means for directing said displaced beams through said sheet of glass; means for reflecting said displaced beams for return through said sheet of glass and to the other side of the optical axis of said optical means, said one scanning beam and its reflected counterpart being transmitted through said glass at substantially spaced regions of the latter, said other scanning beam and its reflected counterpart being transmitted through said glass in substantially the same regions of the latter; and means for causing each of said displaced return beams to impinge on suitably disposed photodetectors individual to the reflected beams.
Claim 10
Dependent Claim
38 words
The combination as set forth in claim 7, and further including processing circuit means associated with said photodetectors and effective to detect, and distinguish between, disruptions in said light beams as caused by such ream and wave defects.
Claim 11
Dependent Claim
41 words
The combination as set forth in claim 7, and characterized in that said means for producing said scanning beams is effective to displace one of said outgoing scanning beams further from said optical axis than the other of the outgoing beams.
Claim 12
Dependent Claim
41 words
The combination as set forth in claim 7, and characterized in that the recited regions of impingement of said one beam and its reflected counterpart are spaced a distance greater than the widths of either a typical ream or wave defect.
References Cited (Backward Citations)
US3081665A
Cited
US3245306A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |