Electrographic recording process
AssigneeEastman Kodak Company
InventorCarl B. Gibbons
Life of this patent
Estimating the term…
Abstract
A recording process is disclosed in which an X-ray sensitive photoconductive element exhibiting persistent conductivity and a charge sensitive, dry processable recording material are sandwiched between a pair of electrodes. A source of potential is applied across the electrodes and the photoconductive element is briefly exposed to an imagewise pattern of X-ray radiation forming a latent image in the recording material. Allowing the current to continue to flow through the sandwich after the X-ray exposure is terminated increases the sensitivity of the recording process by a factor of up to 100. The latent image is then amplified and rendered visible by uniformly heating the entire recording material.
Claims9
An electrographic recording process comprising the steps of:
- a. positioning a persistent conductivity, X-ray sensitive photoconductive element adjacent a charge sensitive recording element containing a reducible metal compound in a binder;
- b. exposing the photoconductive element to an imagewise pattern of X-ray radiation while simultaneously applying an electrical potential across the photoconductive and recording elements said potential being of a magnitude sufficient to produce a latent image in the recording element;
- c. terminating the exposure of the photoconductive element and continuing the application of potential for a period of up to 300 seconds;
- and
- d. heating the entire recording element substantially uniformly to render the latent image visible.
An electrographic recording process comprising the steps of:
- a. positioning a persistent conductivity, X-ray sensitive photoconductive element adjacent a charge sensitive recording element containing a reducible metal compound in a binder;
- b. exposing the photoconductive element to an imagewise pattern of X-ray radiation while simultaneously applying an electrical potential of at least about 3 kilovolts across said photoconductive and recording elements, said potential being of a magnitude sufficient to produce a latent image in the areas of the recording element corresponding to the exposed areas of the photoconductive element;
- c. terminating the exposure of the photoconductive element and continuing the application of potential for a period of up to 300 seconds;
- and
- d. heating the entire recording element substantially uniformly to render the latent image visible.
An electrographic recording process comprising the steps of:
- a. positioning a persistent conductivity, X-ray sensitive photoconductive element adjacent a charge sensitive recording element containing a reducible metal compound in a binder;
- b. exposing the photoconductive element to an imagewise pattern of X-ray radiation while simultaneously applying an electrical potential across the photoconductive and recording elements, said potential being of a magnitude sufficient to produce a latent image in the areas of the recording element corresponding to the exposed areas of the photoconductive element;
- c. terminating the exposure of the photoconductive element and continuing the application of potential until a charge density of from approximately 1 microcouloumb/cm.sup.2 to 1 millicouloumb/cm.sup.2 is produced in the areas of the recording element containing said latent image;
- and
- d. heating the entire recording element substantially uniformly to render said latent image visible.
An electrographic process comprising the steps of:
- a. positioning a persistent conductivity, X-ray sensitive photoconductive element adjacent a charge sensitive recording element containing a reducible metal compound in a binder;
- b. exposing the photoconductive element to an imagewise pattern of X-ray radiation while simultaneously applying an electrical potential of at least about 3 kilovolts across the photoconductive and recording elements, said potential being of a magnitude sufficient to produce a latent image in the areas of the recording element corresponding to the exposed areas of the photoconductive element;
- c. terminating the exposure of the photoconductive element and continuing the application of potential until a charge density of from approximately 1 microcouloumb/cm.sup.2 to 1 millicouloumb/cm.sup.2 is produced in the areas of the recording element containing said latent image;
- and
- d. heating the entire recording element substantially uniformly to render said latent image visible.
Dependencies are inferred from the claim text.