Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Two or more radiation-sensitive layers containing other than...
Reexamination Certificate
2001-04-27
2002-08-20
Le, Hoa Van (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Two or more radiation-sensitive layers containing other than...
C430S359000, C430S383000
Reexamination Certificate
active
06436620
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a silver halide image that varies in color depending on the viewing condition.
BACKGROUND OF THE INVENTION
It is known in the art that photographic display materials are utilized for advertising as well as decorative displays of photographic images. Since these display materials are used in advertising, the image quality of the display material is critical in expressing the quality message of the product or service being advertised. Further, a photographic display image needs to be high impact, as it attempts to draw consumer attention to the display material and the desired message being conveyed. Typical applications for display material include product and service advertising in public places such as airports, buses and sports stadiums, movie posters and fine art photography. The desired attributes of a quality, high impact photographic display material are a slight blue density minimum, durability, sharpness and flatness.
Further, prior art display material typically comprises a still image that is backside illuminated. It is widely known that the human eye is sensitive to motion and that the human eye and brain is attracted to motion and thus display materials integrating motion into an display is highly effective method for advertisement. Prior art motion displays typically consist of a series of still illuminated images that are scrolled back and forth on a take up roll.
Prior art silver halide display materials typically utilize yellow, magenta and cyan dyes to create an image. In a typical yellow, magenta and cyan imaging system the color gamut is limited and fixed once the image is exposed and developed. In order to change colors, another display would have to be generated and separately shown.
Bourdelais et al in U.S. Pat. No. 6,030,756 discusses imaging layers containing silver halide and dye forming couplers applied to both sides of a translucent base for a display material. While the display material in U.S. Pat. No. 6,030,756 provides an excellent image that can be displayed without the need for a backlight source, the image color is fixed. There remains a need in the display market to change the color appearance of the display without having to create a new display or to use expensive electronics devices.
McInerney et al in U.S. Pat. Nos. 5,679,139; 5,679,140; 5,679,141; and 5,679,142 teach the shape of preferred subtractive dye absorption shapes for use in four color, C,M,Y,K based ink-jet prints.
McInerney et al in EP 0 825 488 teaches the shape of preferred subtractive cyan dye absorption shape for use in silver halide based color prints.
Kitchin et al in U.S. Pat. No. 4,705,745 teaches the preparation of a photographic element for preparing half-tone color proofs comprising four separate imaging layers capable of producing cyan, magenta, yellow, and black images.
Powers et al in U.S. Pat. No. 4,816,378, teaches an imaging process for the preparation of color half-tone images that contain cyan, magenta, yellow, and black images. The use of the black dye does little to improve the gamut of color reproduction.
Haraga et al in EP 0 915 374 A1 teaches a method for improving image clarity by mixing ‘invisible’ information in the original scene with a color print and reproducing it as an infrared dye, magenta dye, or as a mixture of cyan magenta and yellow dyes to achieve improved color tone and realism. The addition of the resulting infrared, magenta, or black dye does little to improve the gamut.
In spite of the foregoing teachings, the coupler sets which have been employed in silver halide color imaging have not provided the ability to change color within the same imaging element. There remains a need to change color based on reflected or transmitted light. Viewing
It has been proposed in U.S. Pat. No. 5,866,282 (Bourdelais et al) to utilize a composite support material with laminated biaxially oriented polyolefin sheets as a photographic imaging material. In U.S. Pat. No. 5,866,282, biaxially oriented polyolefin sheets are extrusion laminated to cellulose paper to create a support for silver halide imaging layers. The biaxially oriented sheets described in U.S. Pat. No. 5,866,282 have a microvoided layer in combination with coextruded layers that contain white pigments such as TiO
2
above and below the microvoided layer. In the composite imaging support structure described in U.S. Pat. No. 5,866,282 the silver halide imaging layers are applied to the white, reflecting side of the base that has a spectral transmission less than 15%.
Prior art photographic transmission display materials with incorporated diffusers have light sensitive silver halide emulsions coated directly onto a gelatin coated clear polyester sheet. Incorporated diffusers are necessary to diffuse the light source used to backlight transmission display materials. Without a diffuser, the light source would reduce the quality of the image. Typically, white pigments are coated in the bottom most layer of the imaging layers. Since light sensitive silver halide emulsions tend to be yellow because of the gelatin used, as a binder for photographic emulsions minimum density areas of a developed image will tend to appear yellow. A yellow white reduces the commercial value of a transmission display material because the image viewing public associates image quality with a whiter whites. It would be desirable if a transmission display material with an incorporated diffuser could have a more blue white since a white that is slightly blue is perceptually preferred as the whitest white.
Prior art photographic transmission display materials with incorporated diffusers have light sensitive silver halide emulsions coated directly onto a gelatin subbed clear polyester sheet. TiO
2
is added to the bottom most layer of the imaging layers to diffuse light so well that individual elements of the illuminating bulbs utilized are not visible to the observer of the displayed image. However, coating TiO
2
in the imaging layer causes manufacturing problems such as increased coating coverage which requires more coating machine drying and a reduction in coating machine productivity as the TiO
2
requires additional cleaning of coating machine. Further, as higher amounts of TiO
2
are used to diffuse high intensity backlighting systems, the TiO
2
coated in the bottom most imaging layer causes unacceptable light scattering reducing the quality of the transmission image. It would be desirable to eliminate the TiO
2
from the image layers while providing the necessary transmission properties and image quality properties.
It has been proposed in U.S. Pat. No. 6,017,685 (Bourdelais et al.) to utilize biaxially oriented polyolefin microvoided sheet laminated to polyester for a display base. In U.S. Pat. No. 6,017,685, the incorporated voided layer diffuses the illumination light source avoiding the problems with incorporated TiO
2
as a diffuser screen. Disclosed in U.S. Pat. No. 6,017,685 are yellow, magenta and cyan dyes formed by silver halide process and thus the silver halide image disclosed in U.S. Pat. No. 6,017,685 has a limited dye gamut compared to printed inks. Further, the display image disclosed in U.S. Pat. No. 6,017,685 is intended for a still image, one that is inserted into a light frame and projects a uniform, still image.
In has been proposed in U.S. Pat. Nos. 5,689,372; 5,737,087 and 5,639,580 to provide a reflective imaging member that provides motion. While these patents provide an image with a sense of motion they require the use of multiple image layers that have to critically aligned with each other in the presence of a lenticular screen. The motion is generated as the print material is viewed from various angles. While these images provide both depth and motion, they are very expensive to produce and require great skill to properly align the multiple images. There remains a need to for an imaging element that can provide a sense of motion or change in the image without the expense or high level of skill required aligning multiple images.
PROBLEM TO BE S
Aylward Peter T.
Bourdelais Robert P.
Camp Alphonse D.
Eastman Kodak Company
Leipold Paul A.
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