Photographic elements containing direct-positive emulsions and processes for their use
AssigneeEastman Kodak Company
InventorsRobert A. Silverman, Harry A. Hoyen
Life of this patent
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Abstract
Photographic elements particularly adapted for forming direct-positive images are disclosed in which a radiation-sensitive core-shell emulsion layer and a silver halide emulsion layer incapable of forming a surface latent image within the direct-positive exposure latitude of the first emulsion layer and containing a grain population capable of internally trapping photolytically generated electrons are both present. The photographic elements are capable of exhibiting increased covering power, greater maximum density, and increased speed.
Claims23
A photographic element particularly adapted to forming a direct-positive image comprised of
- a support and, located on said support,
- a first, radiation-sensitive emulsion layer containing core-shell silver halide grain population having a coefficient of variation of less than 20%, and
- a second silver halide emulsion layer substantially incapable of forming a surface latent image within the direct-positive exposure latitude of the first emulsion layer and containing a second grain population capable of internally trapping photolytically generated electrons,
- said second grain population having an average diameter less than 70% that of said first grain population, and
- said first and second silver halide grain populations being present in a weight ratio of from 5:1 to 1:5.
Dependencies are inferred from the claim text.