Patent US4870291A successfully refreshed from Google Patents.
US4870291A
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Splice inspection method and apparatus using light inclined at a prescribed angle
Assignee: Fujifilm Holdings Corp
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Filing: 1989-01-04
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Granted: 1989-09-26
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Expires: 2009-01-04
Abstract
Abstract A method for inspecting a tape splice for defects in which the splice region between two sheets is irradiated with a light beam, the tapes are longitudinally conveyed relative to the light beam, a one-dimensional light detector means receives the portion of the light beam transmitted or reflected by a linear region of the sheets inclined at a prescribed angle to the transverse direction of the sheets, and the presence/absence of a splice defect is discriminated from change or lack of change in the quantity of light received by the light detector means; and an apparatus for carrying out this method.
Inventors
- 👤 Youichi Hayashi
- 👤 Kazuo Kubota
- 👤 Masaaki Sakaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:21
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89; G01N21/8901; G01N21/8903; G11; G11B; G11B23/00; G11B23/02; G11B23/113; G11B23/20; G11B23/26
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
116 words
In a method of inspecting for defects in a splice between the ends of two elongate sheets of the same width comprising the steps of irradiating a splice region of said sheets with a light beam, longitudinally conveying the sheets relative to the light beam, receiving by means of a one-dimensional light detector the portion of the light beam transmitted or reflected by said sheets, and discriminating the quality of the splice from changes in the quantity of received light, the improved method wherein the light received by said one-dimensional light detector is that reflected or transmitted by a linear region of the sheets inclined at a prescribed angle to the transverse direction of the sheets.
Claim 2
Dependent Claim
116 words
In a method of inspecting for defects in a splice between the ends of two elongate sheets of the same width comprising the steps of irradiating a splice region of said sheets with a light beam, longitudinally conveying the sheets relative to the light beam, receiving by means of a one-dimensional light detector the portion of the light beam transmitted or reflected by said sheets, and discriminating the quality of the splice from changes in the quantity of received light, the improved method wherein the light received by said one-dimensional light detector is that reflected or transmitted by a linear region of the sheets inclined at a prescribed angle to the transverse direction of the sheets.
Claim 3
Dependent Claim
16 words
A method as defined in claim 1 wherein said prescribed angle is between 2° and 30°.
Claim 4
Dependent Claim
18 words
A method as defined in claim 1 wherein said prescribed angle is between minus 2° and minus 30°.
Claim 5
Dependent Claim
23 words
A method as defined in claim 1 wherein said sheets are a leader tape and a magnetic tape spliced by a splicing tape.
Claim 6
Independent Claim
103 words
An apparatus for inspecting for defects in a splice between the ends of two elongate sheets of the same width comprising means for irradiating a splice region of said sheets with a light beam, means for longitudinally conveying the elongate sheets relative to the light beam, one-dimensional light detector means for detecting the portion of the light beam transmitted or reflected by a linear region of the sheets inclined at a prescribed angle to the transverse direction of the sheets, and means for discriminating the quality of the splice from changes in the quantity of the light received by said one-dimensional detector means.
Claim 7
Independent Claim
103 words
An apparatus for inspecting for defects in a splice between the ends of two elongate sheets of the same width comprising means for irradiating a splice region of said sheets with a light beam, means for longitudinally conveying the elongate sheets relative to the light beam, one-dimensional light detector means for detecting the portion of the light beam transmitted or reflected by a linear region of the sheets inclined at a prescribed angle to the transverse direction of the sheets, and means for discriminating the quality of the splice from changes in the quantity of the light received by said one-dimensional detector means.
Claim 8
Dependent Claim
20 words
An apparatus as defined in claim 5 wherein said one-dimensional light detector is capable of detecting only total light quantity.
Claim 9
Dependent Claim
16 words
An apparatus as defined in claim 5 wherein said one-dimensional light detector is a charge-coupled device.
Claim 10
Dependent Claim
16 words
An apparatus as defined in claim 5 wherein said prescribed angle is between 2° and 30°.
Claim 11
Dependent Claim
18 words
An apparatus as defined in claim 5 wherein said prescribed angle is between minus 2° and minus 30°.
Claim 12
Dependent Claim
23 words
An apparatus as defined in claim 5 wherein said sheets are a leader tape and a magnetic tape spliced by a splicing tape.
Claim 13
Dependent Claim
15 words
An apparatus as defined in claim 5 wherein said discriminating means is an 8-bit microcomputer.
Claim 14
Dependent Claim
26 words
An apparatus as defined in claim 5 wherein said irradiating means has a diffusion plate through which the light is passed before impinging on said sheets.
Claim 15
Dependent Claim
15 words
An apparatus as defined in claim 5 wherein said irradiating means produces a linear beam.
Claim 16
Dependent Claim
22 words
An apparatus as defined in claim 5 wherein said irradiating means a spot beam which raster scans said sheets at high density.
Claim 17
Dependent Claim
23 words
An apparatus as defined in claim 5 wherein said discriminating means sounds a buzzer when it discriminates that a splice defect is present.
Claim 18
Dependent Claim
24 words
An apparatus as defined in claim 5 wherein said discriminating means lights a light-emitting diode when it discriminates that a splice defect is present.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |