US5012346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illumination system for a film scanner
Assignee: Eastman Kodak Co
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Filing: 1989-10-16
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Granted: 1991-04-30
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Expires: 2009-10-16
Abstract
Abstract An illumination system for a film scanner is disclosed which comprises a light source and optics for providing a line of light on a film. Light transmitted through the film is imaged onto photosensor elements such as CCD arays. In order to obtain a high quality electronic image, a xenon light source is used, color filters are included in the system to control the spectral content of the light provided to the film gate, and an integrating cylinder is used to provide a line of diffuse light on the film.
Inventors
- 👤 Donald DeJager
- 👤 Andrew F. Kurtz
- 👤 David Kessler
- 👤 Leslie G. Moore, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:23
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/024; H04N1/028; H04N1/02815; H04N1/0282; H04N1/0284; G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/54; G03B27/542; H04N5/00; H04N5/222; H04N5/253; H04N9/00; H04N9/11
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
139 words
An illumination system for a film scanner, said system being adapted to provide a line of illumination on a film which is supported for movement in a film gate of the scanner, said system comprising: a light source which is adapted to provide a light beam along an optical path in said system; filter means for receiving said light beam from said source and for controlling the spectral content of light issuing therefrom for different types of film, said filter means including shaping filter means selectively insertable in said light path for substantially conforming at least one spectral region to the peak spectral density of a corresponding film dye in a particular type of film; and an integrating cylinder for receiving said light beam from said filter means and for producing a line of diffuse illumination on said film.
Claim 2
Dependent Claim
139 words
An illumination system for a film scanner, said system being adapted to provide a line of illumination on a film which is supported for movement in a film gate of the scanner, said system comprising: a light source which is adapted to provide a light beam along an optical path in said system; filter means for receiving said light beam from said source and for controlling the spectral content of light issuing therefrom for different types of film, said filter means including shaping filter means selectively insertable in said light path for substantially conforming at least one spectral region to the peak spectral density of a corresponding film dye in a particular type of film; and an integrating cylinder for receiving said light beam from said filter means and for producing a line of diffuse illumination on said film.
Claim 3
Dependent Claim
16 words
An illumination system, as defined in claim 1, wherein said light source is a xenon lamp.
Claim 4
Dependent Claim
26 words
An illumination system, as defined in claim 1, wherein said filter means includes a base density filter which can be selectively inserted in said optical path.
Claim 5
Dependent Claim
33 words
An illumination system, as defined in claim 1, wherein said shaping filter means further confines said one spectral region to a passband corresponding to the spectral dye density of said corresponding film dye.
Claim 6
Dependent Claim
42 words
An illumination system, as defined in claim 1, wherein said shaping filter means conforms the peak sensitivity of at least the red spectral passband to a spectral region substantially corresponding to the peak density of the cyan dye of a selected film.
Claim 7
Dependent Claim
42 words
An illumination system, as defined in claim 5, wherein said shaping filter means includes an infrared cut filter which operates to conform the peak sensitivity of said red spectral passband to the peak density of the cyan dye of a print film.
Claim 8
Dependent Claim
60 words
An illumination system, as defined in claim 5, wherein said shaping filter means includes a notch filter having a transmission null between green and red and an infrared cut filter, and said notch and cut filters operating together to conform the peak sensitivity of said red spectral passband to the peak sensitivity of the cyan dye of a negative film.
Claim 9
Dependent Claim
41 words
An illumination system, as defined in claim 1, wherein said integrating cylinder has an elongated cylindrical light integrating cavity having diffusely reflecting walls, and said cylinder includes an output slit communicating with said cavity through which the line of illumination exits.
Claim 10
Dependent Claim
37 words
An illumination system, as defined in claim 8, wherein the integrating cavity is about 38 mm long by about 20 mm in diameter, and the output slit is about 30 mm long by about 2 mm wide.
Claim 11
Dependent Claim
16 words
An illumination system, as defined in claim 1, wherein said filter means includes a hot mirror.
Claim 12
Dependent Claim
24 words
An illumination system, as defined in claim 1, wherein relay lenses are located in said optical path on opposite sides of said filter means.
Claim 13
Dependent Claim
31 words
An illumination system, as defined in claim 1, wherein optical means are located in said optical path between said filter means and said integrating cylinder for focussing light in said cylinder.
Claim 14
Dependent Claim
18 words
An illumination system, as defined in claim 12, wherein said optical means includes a pair of condensing lenses.
References Cited (Backward Citations)
US3212417A
Cited
US3241440A
Cited
US3647955A
Cited
US3944739A
Cited
US3988537A
Cited
US4013355A
Cited
US4009489A
Cited
US4264193A
Cited
US4226522A
Cited
US4321630A
Cited
US4396834A
Cited
US4422100A
Cited
US4568984A
Cited
US4506300A
Cited
US4833532A
Cited
US4639787A
Cited
US4690564A
Cited
US4624555A
Cited
US4755875A
Cited
US4797711A
Cited
US4856905A
Cited
US4868383A
Cited
US4864408A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-29 | 1994-10-29 | 1995-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-29 | 1998-10-29 | 1999-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-29 | 2002-10-29 | 2003-04-30 | $7700.00 | Window Closed / Lapsed |