US3661461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Co-irradiation system for producing positive images
Assignee: EIDP Inc
•
Filing: 1969-11-26
•
Granted: 1972-05-09
•
Expires: 1989-11-26
Abstract
Abstract Method for producing positive images by irradiating photoimageable and photodeactivatable compositions which are characterized by forming color on irradiation with light in a first wavelength range and by being deactivated against color formation on irradiation with light in a different second wavelength range. The method comprises simultaneously exposing such composition disposed as an image-capture surface to radiations in both wavelength ranges, with 1. THE DEACTIVATING RADIATION BEING APPLIED PATTERNWISE ACCORDING TO THE DESIRED IMAGE TO BE CAPTURED, 2. THE COLOR-FORMING RADIATION BEING APPLIED OVER THE ENTIRE SURFACE TO BE IMAGED, AND 3. THE INTENSITIES AND THE RELATIVE INTENSITIES OF THE TWO RADIATIONS BEING SUCH THAT I. THE DEACTIVATING RADIATION IS ITSELF EFFECTIVE FOR DEACTIVATION AND II. THE COLOR-FORMING RADIATION IS ITSELF EFFECTIVE TO CAUSE COLOR FORMATION IN OTHER THAN THE CO-STRUCK AREAS BUT IS INEFFECTIVE IN THE PRESENCE OF THE DEACTIVATING RADIATION IN THE CO-STRUCK AREAS TO CAUSE SUBSTANTIAL COLOR FORMATION. The composition used is a mixture of A. color forming components which are responsive to said first wavelength range and thereby produce a first photo-induced oxidation-reduction reaction, and B. deactivating components which are responsive to said second wavelength range and thereby produce a deactivating agent by a second oxidation-reduction reaction, said deactivating agent thus produced being a stronger reducing agent than the reductant member of the color-forming components and thereby preventing the color-forming reaction when the composition is subsequently exposed to the first wavelength range.
Inventors
- 👤 Rolf Dessauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:01
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/685; G03C1/72; G03C1/73; G03C1/732
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
14 words
THE DEACTIVATING RADIATION BEING APPLIED PATTERNWISE ACCORDING TO THE DESIRED IMAGE TO BE CAPTURED,
Claim 2
Dependent Claim
14 words
THE DEACTIVATING RADIATION BEING APPLIED PATTERNWISE ACCORDING TO THE DESIRED IMAGE TO BE CAPTURED,
Claim 3
Dependent Claim
13 words
THE COLOR-FORMING RADIATION BEING APPLIED OVER THE ENTIRE SURFACE TO BE IMAGED, AND
Claim 4
Dependent Claim
13 words
THE COLOR-FORMING RADIATION BEING APPLIED OVER THE ENTIRE SURFACE TO BE IMAGED, AND
Claim 5
Dependent Claim
118 words
The apparatus of claim 1 wherein the first radiation source is an ultraviolet source, the ultraviolet light including wavelengths usable by said photosensitive composition for color formation the second radiation source is a visible light source, the visible light including wavelengths usable by the photosensitive composition for deactivation, the modulator is an image-bearing film, a stencil or an electronically or magnetically controlled light valve for generating optical characters, there are also present interposed between the visible light source and the modulator (i) an optical filter that screens out wavelengths of light other than said usable wavelengths and (ii) a means for absorbing infrared radiation components from said visible light radiation sufficient to prevent thermal destruction of said modulator.
Claim 6
Dependent Claim
28 words
a first photoradiation source and means for directing said photoradiation in a color-forming wavelength in a substantially uniform flux density over the entire surface of the photosensItive composition,
Claim 7
Dependent Claim
28 words
a first photoradiation source and means for directing said photoradiation in a color-forming wavelength in a substantially uniform flux density over the entire surface of the photosensItive composition,
Claim 8
Dependent Claim
156 words
a second photoradiation source and means for directing said photoradiation in a deactivating wavelength range in a substantially uniform flux density over the entire surface of the photosensitive composition, 4 a radiation modulating means interposed between the surface of the photosensitive composition and the photoradiation from the second source so as to create a pattern of said photoradiation on said surface, said modulating means containing areas which are essentially transparent to said second radiation and areas which are essentially opaque to said radiation, said first and second radiation sources and directing means and said modulator being positioned with respect to the surface of the photosensitive composition and to each other such that a. both radiations in the absence of the modulator can irradiate the same total surface area to be imaged, and b. the modulator screens a positive image-creating portion of said second radiation without screening the first radiation from the photosensitive surface of said composition.
Claim 9
Dependent Claim
156 words
a second photoradiation source and means for directing said photoradiation in a deactivating wavelength range in a substantially uniform flux density over the entire surface of the photosensitive composition, 4 a radiation modulating means interposed between the surface of the photosensitive composition and the photoradiation from the second source so as to create a pattern of said photoradiation on said surface, said modulating means containing areas which are essentially transparent to said second radiation and areas which are essentially opaque to said radiation, said first and second radiation sources and directing means and said modulator being positioned with respect to the surface of the photosensitive composition and to each other such that a. both radiations in the absence of the modulator can irradiate the same total surface area to be imaged, and b. the modulator screens a positive image-creating portion of said second radiation without screening the first radiation from the photosensitive surface of said composition.
Claim 10
Dependent Claim
14 words
The apparatus of claim 1, said photosensitive com-position being a photoimageable and photodeactivatable compo-sition.
Claim 11
Dependent Claim
144 words
THE INTENSITIES AND THE RELATIVE INTENSITIES OF THE TWO RADIATIONS BEING SUCH THAT I. THE DEACTIVATING RADIATION IS ITSELF EFFECTIVE FOR DEACTIVATION AND II. THE COLOR-FORMING RADIATION IS ITSELF EFFECTIVE TO CAUSE COLOR FORMATION IN OTHER THAN THE CO-STRUCK AREAS BUT IS INEFFECTIVE IN THE PRESENCE OF THE DEACTIVATING RADIATION IN THE CO-STRUCK AREAS TO CAUSE SUBSTANTIAL COLOR FORMATION. THE COMPOSITION USED IS A MIXTURE OF A. COLOR FORMING COMPONENTS WHICH ARE RESPONSIVE TO SAID FIRST WAVELENGTH RANGE AND THEREBY PRODUCE A FIRST PHOTOINDUCED OXIDATION-REDUCTION REACTION, AND B. DEACTIVATING COMPONENTS WHICH ARE RESPONSIVE TO SAID SECOND WAVELENGTH RANGE AND THEREBY PRODUCE A DEACTIVATING AGENT BY A SECOND OXIDATION-REDUCTION REACTION, SAID DEACTIVATING AGENT THUS PRODUCED BEING A STRONGER REDUCING AGENT THAN THE REDUCTANT MEMBER OF THE COLORFORMING COMPONENTS AND THEREBY PREVENTING THE COLORFORMING REACTION WHEN THE COMPOSITION IS SUBSEQUENTLY EXPOSED TO THE FIRST WAVELENGTH RANGE.
Claim 12
Dependent Claim
144 words
THE INTENSITIES AND THE RELATIVE INTENSITIES OF THE TWO RADIATIONS BEING SUCH THAT I. THE DEACTIVATING RADIATION IS ITSELF EFFECTIVE FOR DEACTIVATION AND II. THE COLOR-FORMING RADIATION IS ITSELF EFFECTIVE TO CAUSE COLOR FORMATION IN OTHER THAN THE CO-STRUCK AREAS BUT IS INEFFECTIVE IN THE PRESENCE OF THE DEACTIVATING RADIATION IN THE CO-STRUCK AREAS TO CAUSE SUBSTANTIAL COLOR FORMATION. THE COMPOSITION USED IS A MIXTURE OF A. COLOR FORMING COMPONENTS WHICH ARE RESPONSIVE TO SAID FIRST WAVELENGTH RANGE AND THEREBY PRODUCE A FIRST PHOTOINDUCED OXIDATION-REDUCTION REACTION, AND B. DEACTIVATING COMPONENTS WHICH ARE RESPONSIVE TO SAID SECOND WAVELENGTH RANGE AND THEREBY PRODUCE A DEACTIVATING AGENT BY A SECOND OXIDATION-REDUCTION REACTION, SAID DEACTIVATING AGENT THUS PRODUCED BEING A STRONGER REDUCING AGENT THAN THE REDUCTANT MEMBER OF THE COLORFORMING COMPONENTS AND THEREBY PREVENTING THE COLORFORMING REACTION WHEN THE COMPOSITION IS SUBSEQUENTLY EXPOSED TO THE FIRST WAVELENGTH RANGE.
Claim 13
Dependent Claim
160 words
The apparatus of claim 3, said photoimageable and photodeactivatable composition comprising an admixture of A. a color-forming component comprising (1) an organic color generator and (2) a photoactivatable first oxidant which can oxidize the color generator to a colored com-pound on irradiating the said first oxidant with light of a first wavelength range, and B. a deactivating component comprising (1) a second photoactivatable oxidant which is activatable by light of a second wavelength range, is not an oxidant for the color generator but is reducible when activated by light of said second wavelength range, and (2) a reductant which is a reductant for the second oxidant but not for the first oxidant, said reductant being capable of reducing the second oxidant on irradiation by light of said second wavelength range to a second reductant which is a reductant for the photoactivated first oxidant, whereby the second reductant prevents the color forming reaction between the color generator and the first oxidant.
Claim 14
Dependent Claim
14 words
The apparatus of claim 2, said photosensitive composition being a photoimageable and photodeactivatable composition.
Claim 15
Dependent Claim
160 words
The apparatus of claim 5, said photoimageable and photodeactivatable composition comprising an admixture of A. a color-forming component comprising (1) an organic color generator and (2) a photoactivatable first oxidant which can oxidize the color generator to a colored compound on irradiating the said first oxidant with light of a first wavelength range, and B. a deactivating component comprising (1) a second photoactivatable oxidant which is activatable by light of a second wavelength range, is not an oxidant for the color generator but is reducible when activated by light of said second wavelength range, and (2) a reductant which is a reductant for the second oxidant but not for the first oxidant, said reductant being capable of reducing the second oxidant on irradiation by light of said second wavelength range to a second reductant which is a reductant for the photoactivated first oxidant, whereby the second reductant prevents the color forming reaction between the color generator and the first oxidant.
References Cited (Backward Citations)
US3085469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |