Patent US4705745A successfully refreshed from Google Patents.
US4705745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic materials and color proofing system
Assignee: Kodak Graphics Holding Inc
•
Filing: 1986-03-03
•
Granted: 1987-11-10
•
Expires: 2006-03-03
Abstract
Abstract A radiation-sensitive element for half tone color proofing adapted to be exposed by scanning with four independently modulated sources of radiation emitting at different wavelengths within the range 550 to 900 nm, the element comprising a substrate bearing at least four separate imaging media coated thereon, said imaging media including: (1) an imaging medium capable of forming a yellow image upon imagewise exposure and processing, (2) an imaging medium capable of forming a magenta image upon imagewise exposure and processing, (3) an imaging medium capable of forming a cyan image upon imagewise exposure and processing, and (4) an imaging medium capable of forming a black or a balancing black image upon imagewise exposure and processing, each imaging medium having a maximum spectral sensitivity at a wavelength different from that of the maximum sensitivity of the other imaging media such that after exposure and processing super-imposed yellow, magenta, cyan and black or balancing black images are formed, each image being attributable to the imagewise exposure of the respective source. Three layer elements of forming yellow, magenta and cyan images may be used for preparing half-tone full color images. Exposure apparatus comprising at least three independently modulated sources, preferably semi conductor sources emitting in the region of 550 to 900 nm may be used for imaging.
Inventors
- 👤 Jonathan P. Kitchin
- 👤 Stephen R. Powers
- 👤 Keith A. Penfound
- 👤 Peter J. Finn
- 👤 Michael G. Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:30
CPC Classifications
G; G03; G03C; G03C1/00; H; H04; H04N; H04N1/00; H04N1/46; H04N1/50; H04N1/502; G03C1/494; G03C1/498; G03C1/49881; G03C7/00; G03C7/28; G03C7/30; G03C7/3041; G03C8/00; G03C8/02; G03C8/08; G03F; G03F3/00; G03F3/10; G03F3/107
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
117 words
A radiation-sensitive element suitable for the preparation of half-tone colour proofs comprising a substrate bearing at least four separate imaging media coated as layers thereon, said imaging media including: (1) an imaging medium capable of forming a yellow image upon imagewise exposure and processing, (2) an imaging medium capable of forming a magenta image upon imagewise exposure and processing, (3) an imaging medium capable of forming a cyan image upon imagewise exposure and processing, and (4) an imaging medium capable of forming a black image or a balancing black upon imagewise exposure and processing, each imaging medium having a maximum spectral sensitivity at a wavelength different from that of the maximum sensitivity of the other imaging media.
Claim 2
Dependent Claim
117 words
A radiation-sensitive element suitable for the preparation of half-tone colour proofs comprising a substrate bearing at least four separate imaging media coated as layers thereon, said imaging media including: (1) an imaging medium capable of forming a yellow image upon imagewise exposure and processing, (2) an imaging medium capable of forming a magenta image upon imagewise exposure and processing, (3) an imaging medium capable of forming a cyan image upon imagewise exposure and processing, and (4) an imaging medium capable of forming a black image or a balancing black upon imagewise exposure and processing, each imaging medium having a maximum spectral sensitivity at a wavelength different from that of the maximum sensitivity of the other imaging media.
Claim 3
Dependent Claim
77 words
An element as claimed in claim 1, in which each imaging medium has a sensitivity at the wavelength of the maximum spectral sensitivity of the other imaging media which is not significant so that upon image-wise exposure of the element to radiation of a wavelength corresponding to the maximum spectral sensitivity of one of said imaging media of sufficient intensity to cause image formation in that medium, image formation will be confined to said one imaging medium.
Claim 4
Dependent Claim
33 words
An element as claimed in claim 2, in which the light sensitive media each contain silver halide emulsions with maximum spectral sensitivity at different wavelengths chosen from the region 550 to 900 nm.
Claim 5
Dependent Claim
45 words
An element as claimed in claim 3 in which the wavelength corresponding to the maximum spectral sensitivity of one of said imaging media differs from the wavelength corresponding to the maximum spectral sensitivity of all of said other imaging media by at least 20 nm.
Claim 6
Dependent Claim
36 words
An element as claimed in claim 2, in which the sensitivities of the media (at the wavelength of maximum spectral sensitivity) decrease from the medium of shortest wavelength sensitivity to the medium of longest wavelength sensitivity.
Claim 7
Dependent Claim
17 words
An element as claimed in claim 5, in which the sensitivity decrease is at least 10 times.
Claim 8
Dependent Claim
63 words
An element as claimed in claim 1, in which the sensitometric contrast of each imaging medium is sufficiently high that the difference between the exposure required to give a density which is 5% of the maximum density above fog and the exposure required to give a density which is 90% of the maximum density above fog is less than 1.5 log exposure units.
Claim 9
Dependent Claim
40 words
An element as claimed claim 1, in which the dye images are formed by imaging processes selected from the group consisting of the silver dye-bleach process, the color coupler process, the dye diffusion transfer process, and the dry silver process.
Claim 10
Dependent Claim
37 words
An element as claimed in claim 8, which is overcoated with a filter selected from the group consisting of a bleachable filter medium absorbing ultraviolet and/or blue and/or green light and a filter containing yellow colloidal silver.
Claim 11
Dependent Claim
28 words
An element as in claim 9, which is of the silver dye-bleach type which additionally contains a yellow or magenta azo dye in the colloidal silver filter medium.
Claim 12
Dependent Claim
16 words
An element as claimed in claim 1 in which each imaging medium is a single layer.
Claim 13
Dependent Claim
49 words
An element as claimed in claim 1 in which the image forming media are coated on the substrate in the following order: (1) Black or Balancing black image forming medium (2) Yellow or cyan image forming medium (3) Cyan or yellow image forming medium (4) Magenta image forming medium.
Claim 14
Dependent Claim
48 words
A process of forming a half-tone colour image comprising exposing a material as claimed in claim 1 to four independently modulated sources of radiation which sources are selected such that each source emits radiation at a wavelength corresponding to the wavelength of maximum sensitivity of a respective medium.
Claim 15
Dependent Claim
26 words
A process as claimed in claim 13, in which the sources are selected from light emitting diodes, infrared emitting diodes, semi-conductor lasers and any combination thereof.
Claim 16
Dependent Claim
32 words
A process as claimed in claim 13 in which the intensities of the sources at the film plane increase from the source of shortest wavelength to the source of longest wavelength radiation.
Claim 17
Dependent Claim
16 words
A process as claimed in claim 15 in which the increase is at least 20 times.
Claim 18
Dependent Claim
38 words
A process as claimed in claim 13 in which there are a plurality of independently modulated sources of radiation emitting at one or more of the wavelengths corresponding to the wavelength of maximum sensitivity of a respective medium.
Claim 19
Dependent Claim
180 words
A process for producing a coloured half-tone image comprising providing a light sensitive element comprising a substrate bearing three separate imaging media coated as layers thereon, said imaging media consisting of: (1) an imaging medium capable of forming a yellow image upon imagewise exposure and processing, (2) an imaging medium capable of forming a magenta image upon imagewise exposure and processing, and (3) an imaging medium capable of forming a cyan image upon imagewise exposure and processing, each imaging medium having a maximum spectral sensitivity at a wavelength different from that of the maximum spectral sensitivity of the other imaging media and a sensitivity at the wavelength of maximum spectral sensitivity of any of said other imaging media which is not significant compared to the maximum sensitivity of said other media, exposing said element to three independently modulated sources each emitting radiation of a wavelength corresponding to the wavelength of maximum sensitivity of a respective imaging medium, said exposure being conducted in raster fashion, each of said sources emitting radiation in the wavelength range of 550 nm to 900 nm.
Claim 20
Dependent Claim
180 words
A process for producing a coloured half-tone image comprising providing a light sensitive element comprising a substrate bearing three separate imaging media coated as layers thereon, said imaging media consisting of: (1) an imaging medium capable of forming a yellow image upon imagewise exposure and processing, (2) an imaging medium capable of forming a magenta image upon imagewise exposure and processing, and (3) an imaging medium capable of forming a cyan image upon imagewise exposure and processing, each imaging medium having a maximum spectral sensitivity at a wavelength different from that of the maximum spectral sensitivity of the other imaging media and a sensitivity at the wavelength of maximum spectral sensitivity of any of said other imaging media which is not significant compared to the maximum sensitivity of said other media, exposing said element to three independently modulated sources each emitting radiation of a wavelength corresponding to the wavelength of maximum sensitivity of a respective imaging medium, said exposure being conducted in raster fashion, each of said sources emitting radiation in the wavelength range of 550 nm to 900 nm.
Claim 21
Dependent Claim
21 words
A process as claimed in claim 18 in which the wavelength separation between any two sources is at least 20 nm.
Claim 22
Dependent Claim
62 words
A process as claimed in claim 18 in which sensitometric contrast of each imaging medium is sufficiently high that the difference between the exposure required to give a density which is 5% of the maximum density above fog and that exposure required to give a density which is 90% of the maximum density above fog is less than 2.0 log exposure units.
Claim 23
Dependent Claim
18 words
A process as claimed in claim 20 in which said difference is less than 1.5 log exposure unites.
Claim 24
Dependent Claim
40 words
A process as claimed in claim 18 in which each of the image media contains two silver halide emulsions of different speeds such that the plot of density against log exposure for the image media exhibits a point of inflexion.
References Cited (Backward Citations)
US3324023A
Cited
US3598583A
Cited
US3672898A
Cited
US4425417A
Cited
US4416522A
Cited
US4520093A
Cited
US4610949A
Cited
US4571373A
Cited
US4600669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-09 | 1991-05-11 | 1991-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-09 | 1995-05-11 | 1995-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-09 | 1999-05-11 | 1999-11-10 | $7700.00 | Window Closed / Lapsed |