US4620235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disc film scanning apparatus
Assignee: Eastman Kodak Co
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Filing: 1984-06-25
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Granted: 1986-10-28
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Expires: 2004-06-25
Abstract
Abstract A method of and apparatus for scanning annularly arranged images on a disc film arranged for rotation about its axis so as to present sequentially the images at a scanning station, is provided. To correct for keystone distortion of a scanned image, a dove prism or equivalent mirror box is located on the optical axis and is rotated about such axis at half the speed of rotation of the disc.
Inventors
- 👤 Peter B. Watt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:30
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/04; H04N1/10; G; G02; G02B; G02B27/00; G02B27/64; G02B27/642; H04N2201/00; H04N2201/04; H04N2201/0402; H04N2201/0424
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
102 words
A method of effecting line by line scanning of a rectangular image area of a plurality of such areas located annularly on a rotatable disc film, the method comprising the steps of: (a) indexing the disc about its axis to present the first of such areas at a scanning station, (b) forming an image of a line of the rectangular image area on a linear CCD array in the scanning station, and (c) moving the image so formed in a direction perpendicular to the linear CCD array to present images of successive lines of the rectangular image area on the CCD array.
Claim 2
Independent Claim
102 words
A method of effecting line by line scanning of a rectangular image area of a plurality of such areas located annularly on a rotatable disc film, the method comprising the steps of: (a) indexing the disc about its axis to present the first of such areas at a scanning station, (b) forming an image of a line of the rectangular image area on a linear CCD array in the scanning station, and (c) moving the image so formed in a direction perpendicular to the linear CCD array to present images of successive lines of the rectangular image area on the CCD array.
Claim 3
Dependent Claim
40 words
A method as claimed in claim 1 wherein the disc is rotated about its axis and optical means are arranged to correct the angular motion of the image of the rectangular image area to rectilinear motion perpendicular to the array.
Claim 4
Dependent Claim
41 words
A method as claimed in claim 2 wherein the image is formed by an objective lens and the optical means comprises a dove prism or equivalent mirror box located on the optical axis and at one side of the objective lens.
Claim 5
Dependent Claim
33 words
A method as claimed in claim 3 wherein the dove prism or equivalent mirror box is rotated in the same sense as and at half the angular speed of rotation of the disc.
Claim 6
Dependent Claim
53 words
A method as claimed in claim 3 or 4 wherein, upon completion of the scan of each rectangular image area, the dove prism or equivalent mirror box is returned to a start position whilst the disc is rotated further about its axis to present a next rectangular image area at the scanning station.
Claim 7
Dependent Claim
19 words
A method as claimed in claim 1 wherein the CCD array is longer than the image of a line.
Claim 8
Independent Claim
78 words
An apparatus for line by line scanning disc films, the apparatus comprising a scanning station, means for line by line scanning of an image annularly arranged on the disc at the scanning station, optical means for imaging the line scan on a CCD array, a dove prism or equivalent mirror box located on the optical axis, and means for rotating the disc about its axis and for rotating, at half speed, the dove prism about the optical axis.
Claim 9
Independent Claim
78 words
An apparatus for line by line scanning disc films, the apparatus comprising a scanning station, means for line by line scanning of an image annularly arranged on the disc at the scanning station, optical means for imaging the line scan on a CCD array, a dove prism or equivalent mirror box located on the optical axis, and means for rotating the disc about its axis and for rotating, at half speed, the dove prism about the optical axis.
Claim 10
Dependent Claim
25 words
An apparatus as claimed in claim 7 further including a CCD array longer in length than the length of the image of a scanned line.
References Cited (Backward Citations)
FR1299525A
Cited
US3442575A
Cited
US3441334A
Cited
US3715497A
Cited
US3647961A
Cited
US4094576A
Cited
US4144542A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-27 | 1990-04-28 | 1990-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-27 | 1994-04-28 | 1994-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-27 | 1998-04-28 | 1998-10-28 | $7700.00 | Window Closed / Lapsed |