Color photographic element containing three silver halide layers sensitive to infrared
AssigneeMinnesota Mining and Manufacturing Company
InventorsSharon M. Simpson, John M. McQuade, John R. Boon
Life of this patent
Estimating the term…
Abstract
Full color photographic images are produced by exposure of a radiation-sensitive element comprising at least three silver halide emulsion layers. At least two silver halide emulsion layers are sensitized to infrared radiation. Selectively absorptive filter layers and/or differential sensitivities between emulsion layers are used to prevent exposure of other layers to radiation used to expose a single layer.
Claims37
A photographic element capable of providing a full color image without exposure to radiation within the visible region of the electromagnetic spectrum comprising
- (a) a substrate, and
- (b) on one side of said substrate at least three silver halide emulsion layers, each of said silver halide emulsion layers being associated with a different color photographic coupler, each of said couplers being capable of forming a different color dye upon reaction with an oxidized color photographic developer,
- said three silver halide emulsion layers comprising, in order from the substrate to the surface of said photographic element, a first emulsion sensitized to a portion of the infrared region of the electromagnetic spectrum, a second emulsion sensitized to a portion of the infrared region of the electromagnetic spectrum which is of a shorter wavelength than the portion to which said first emulsion is sensitized, and a third emulsion sensitized to a portion of the infrared region of the electromagnetic spectrum which is of a shorter wavelength than the portion to which said second emulsion is sensitized, and said three silver halide emulsion layers having a construction selected from the group consisting of:
- (1) each of the three layers having a contrast between 0.5 and 12 and differing from each other in photographic speed such that, at an optical density of 1.3, the speed of the third emulsion is at least 0.2 logE units faster than the second emulsion layer, and the second emulsion is at least 0.2 logE units faster than the first emulsion layer,
- (2) between said first and second emulsion layers is a filter layer absorbing infrared radiation in a range overlapping the region of maximum sensitivity of said second emulsion layer without absorbing more than forty percent of the infrared radiation to which said first emulsion layer is sensitized, and between said second emulsion layer and said third emulsion layer is a filter layer absorbing radiation in a range overlapping the region of maximum sensitivity of said third emulsion layer without absorbing more than forty percent of the infrared radiation to which said second layer is sensitized, and
- (3) directly between two layers comprising either said first and second emulsion layers or said second and third emulsion layers a filter layer absorbing radiation in a range overlapping the region of maximum sensitivity the one of the two layers further away from the substrate without absorbing more than forty percent of the infrared radiation to which the other of said two layers is sensitized and the other pair of emulsion layers comprising said second and third emulsion layers and said first and second emulsion layers, respectively, having a contrast between 0.5 and 12 and differing in speed from each other so that at an optical density of 1.3, the speed of the emulsion layer farthest from the substrate in said other pair of emulsion layers is at least 0.2 logE units faster than the speed of the emulsion layer closest to the substrate in said other pair of emulsion layers.
A photosensitive element capable of providing a full color image with exposure of at least two silver halide emulsion layers to radiation within the infrared region of the electromagnetic spectrum comprising
- (a) a substrate, and
- (b) on one side of said substrate at least three silver halide emulsion layers, each of said silver halide emulsion layers being associated with a means for providing a different color dye image,
- said three silver halide emulsion layers comprising, in order towards the surface of said photographic element to be exposed, a first emulsion sensitized to a portion of the infrared region of the electromagnetic spectrum, a second emulsion sensitized to a portion of the infrared region of the electromagnetic spectrum which is of a shorter wavelength than the portion to which said first emulsion is sensitized, and a third emulsion sensitized to a portion of the electromagnetic spectrum which is of a shorter wavelength than the portion to which said second emulsion is sensitized, and said three silver halide emulsion layers having a construction selected from the group consisting of:
- (1) each of the three layers having a contrast between 0.5 and 12 and the first two layers differing from each other in photographic speed such that, at an optical density of 1.3, speed of the second emulsion layer, and the second emulsion is at least 0.2 logE units faster than the first emulsion layer, and
- (2) between said first and second emulsion layers is a filter layer absorbing infrared radiation in a range overlapping the region of maximum sensitivity of said second emulsion layer without absorbing more than forty percent of the infrared radiation to which said first emulsion layer is sensitized.
A photosensitive element capable of providing a full color image exposure of at least two silver halide emulsion layers to radiation within the infrared region of the electromagnetic spectrum comprising
- (a) a substrate, and
- (b) on one side of said substrate at least three silver halide emulsion layers, each of said silver halide emulsion layers being associated with a means for providing a
- different color dye image, said three silver halide emulsion layers comprising, a first emulsion sensitized to a portion of the infrared region of the electromagnetic spectrum, a second emulsion sensitized to a portion of the infrared region of the electromagnetic spectrum which is of a shorter wavelength than the portion to which said first emulsion is sensitized, and a third emulsion sensitized to a portion of the electromagnetic spectrum which is of a shorter wavelength than the portion to which said second emulsion is sensitized, and said three silver halide emulsion layers having a construction selected from the group consisting of:
- (1) each of the three layers having a contrast between 0.5 and 12 and the first two layers differing from each other in photographic speed such that, at an optical density of 1.3, the speed of the second emulsion layer, is at least 0.2 logE units faster than the first emulsion layer, and
- (2) between said first and second emulsion layers is a filter layer absorbing infrared radiation in a range overlapping the region of maximum sensitivity of said second emulsion layer without absorbing more than forty percent of the infrared radiation to which said first emulsion layer is sensitized.
A color photographic element comprising at least three silver halide emulsion layers on a substrate, each of said three silver halide emulsion layers being capable of forming a single color image of a different color dye, said three silver halide emulsion layers comprising, in any order, a first silver halide emulsion layer sensitized to a portion of the infrared region of the electromagnetic spectrum, a second silver halide emulsion layer sensitized to a different portion of the infrared region of the electromagnetic spectrum, the wavelengths of maximum spectral sensitivity for said first and second layer differing by at least 15 nm, and a third silver halide emulsion layer sensitized to a third portion of the electromagnetic spectrum, the wavelength of maximum spectral sensitivity for said third layer differing by at least 15 nm from the wavelengths of maximum spectral sensitivity of said first and second layers, the sensitivities of each of said three silver halide emulsion layers being such that between any two layers having their maximum sensitivity in the infrared, the emulsion layer having the shorter wavelength of maximum spectral sensitivity has a speed which is at least 0.2 logE units faster than the other of said any two layers.
Dependencies are inferred from the claim text.