Radiation imagery chemistry: process – composition – or product th – Color imaging process – Using identified radiation sensitive composition in the...
Reexamination Certificate
2000-06-05
2001-05-15
Le, Hoa Van (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Color imaging process
Using identified radiation sensitive composition in the...
C430S494000
Reexamination Certificate
active
06232050
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method for forming a color image by using an organic light emitting device as an exposure light source, and particularly relates to a method for forming a color image comprising digital exposure in accordance with image data using a linear organic light emitting device and development process to obtain an image.
BACKGROUND OF THE INVENTION
Laser diode (LD) and inorganic light emitting diode (LED) known as the light emitting device are well known as exposure light sources for writing on a photographic material. However, the emission wavelengths of LD and LED cannot be changed easily, in particular, there is almost no room of selection in the wavelength of blue light emitting device. The organic light emitting device has been eagerly studied since 1980 due to the advantage of a thin film light emitting device and the use as the exposure light source has been discussed. For example, as disclosed in JP-A-7-22649 (the term “JP-A” as used herein means an “unexamined published Japanese patent application”), it has been suggested to use the organic light emitting device for exposure of generally commercially available photographic films and films for instant cameras by means of a photorecording apparatus provided with a plurality of lines of organic light emitting devices arranged in dot array classified by luminescent colors. The organic light emitting device is easy to obtain arbitrary emission spectrum and arrange in dot array, and design with less moving parts is practicable, therefore, it can be preferably used as an exposure light source.
However, in a silver halide photographic material having at least three spectral sensitivities in the radiant rays of the region of from 400 to 900 nm, the emission spectrum of the exposure light source is particularly important, and there are problems that when exposure is performed using ordinary organic light emitting devices having broad half band widths, color turbidity (a negative photographic material) or color blank (a positive photographic material) are generated, and color reproduction of the image is deteriorated. It has been found that this phenomenon is attributed to the fact that when silver halide is spectrally sensitized with a sensitizing dye, a sensitivity peak acutely descending is generally formed on the longer wavelength side not on the short wavelength side, on the other hand, when an organic light emitting device is used, the emission spectrum is generally steep on the short wavelength side not on the long wavelength side.
SUMMARY OF THE INVENTION
In view of the above-described actual circumstances, an object of the present invention is to provide a method of obtaining a color image showing good color reproduction by the steps comprising exposing a photosensitive material in accordance with image data with an organic light emitting device and development processing the material.
Another object of the present invention is to provide a method for forming a color image with a thin and light weight exposure means with less moving parts.
The above object of the present invention has been attained by the following means.
(1) A method for forming a color image comprising exposing a color photographic material, wherein the color photographic material comprises a support having provided thereon at least (1) a photosensitive layer capable of forming a yellow image by imagewise exposure and processing, (2) a photosensitive layer capable of forming a magenta image by imagewise exposure and processing, and (3) a photosensitive layer capable of forming a cyan image by imagewise exposure and processing, each of said photosensitive layers is sensitive to the radiant rays in the range of from 380 to 900 nm, each photosensitive layer has different wavelength corresponding to the maximum spectral sensitivity, the maximum spectral sensitivities of photosensitive layers (1) to (3) gradually diminish from the photosensitive layer having the maximum spectral sensitivity at the shortest wavelength to the photosensitive layer having the maximum spectral sensitivity at the longest wavelength, and exposure is performed by using at least three organic light emitting devices, wherein said at least three organic light emitting devices are in dot array state each having peak wavelength of emission spectrum within the wavelength region corresponding to the spectral sensitivity of each photosensitive layer, and the emission strengths of emission spectra of said organic light emitting devices gradually increase from the organic light emitting device emitting light at the shortest wavelength region to the organic light emitting device emitting light at the longest wavelength region.
(2) The method for forming a color image as described in the above item (1), wherein the color photographic material further has the fourth photosensitive layer (sensitive to radiant rays in the range of from 380 to 900 nm) capable of forming or compensating for a black image by imagewise exposure and processing, and exposure is performed by further using the fourth dot array state organic light emitting device corresponding to the fourth photosensitive layer.
(3) The method for forming a color image as described in the above item (1) or (2), wherein the sensitivity difference between the photosensitive layer having the maximum spectral sensitivity at the shortest wavelength and the photosensitive layer having the maximum spectral sensitivity at the longest wavelength is larger than 0.2 log light exposure unit.
(4) The method for forming a color image as described in the above item (1), (2) or (3), wherein each dot of each dot array state organic light emitting device emits light in at least eight scattered levels and exposure of the photosensitive layer is performed correspondingly in at least eight scattered levels.
(5) The method for forming a color image as described in any of the above items (1) to (4), wherein the wavelengths corresponding to the maximum spectral sensitivities of said photosensitive layers of said color photographic material are at least 50 nm apart from one another.
REFERENCES:
patent: 4705745 (1987-11-01), Kitchin et al.
patent: 4824770 (1989-04-01), Kitchin et al.
patent: 5703436 (1997-12-01), Forrest et al.
Hirai Hiroyuki
Yokokawa Takuya
Fuji Photo Film Co. , Ltd.
Le Hoa Van
Sughrue Mion Zinn Macpeak & Seas, PLLC
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