Image-forming medium coated with microcapsule layer for forming image
AssigneePENTAX Corporation
InventorsMinoru Suzuki, Kazuyuki Shimbo, Yutaka Igari
Life of this patent
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Abstract
In an image-forming medium, a sheet of paper is coated with a layer of microcapsules which is composed of a binder material and a plurality of microcapsules filled with dye and uniformly distributed in the binder material. The binder material exhibits a predetermined thermal melting point, and the microcapsules exhibit a pressure-breaking characteristic so as to be squashed and broken under a predetermined pressure when said binder material is thermally softened or melted. When a leuco-pigment-based dye is used, a color developer is substituted for the binder material.
Claims40
An image-forming medium comprising:
- a substrate;
- and
- a layer of microcapsules, coated over said substrate, composed of a binder material and a plurality of microcapsules filled with one of a dye and ink and uniformly distributed in said binder material;
- wherein said binder material exhibits a predetermined thermal melting point, and said microcapsules exhibit a pressure-breaking characteristic so as to be squashed and broken under a predetermined pressure when said binder material is thermally softened or melted.
An image-forming medium comprising:
- a substrate;
- and
- a layer of microcapsules, coated over said substrate, including first and second microcapsule layer sections, said second microcapsule layer section being formed on said substrate, said first microcapsule layer section being formed on said second microcapsule layer section, said first microcapsule layer section being composed of a first binder material, and a first type of microcapsules filled with one of a first dye and ink and uniformly distributed in said first binder material, said second microcapsule layer section being composed of a second binder material, and a second type of microcapsules filled with one of a second dye and ink and uniformly distributed in said second binder material;
- wherein said first binder material exhibits a first predetermined thermal melting point, and said first type of microcapsules exhibits a first pressure-breaking characteristic so as to be squashed and broken under a first predetermined pressure when said first binder material is thermally softened or melted, and
- wherein said second binder material exhibits a second predetermined thermal melting point higher than said first thermal melting point, and said second type of microcapsules exhibits a second pressure-breaking characteristic so as to be squashed and broken under a second predetermined pressure lower than said first predetermined pressure when said second binder material is thermally softened or melted.
An image-forming medium comprising:
- a substrate;
- and
- a layer of microcapsules, coated over said substrate, composed of a color developer, a first type of microcapsules filled with one of a first leuco-compound-based dye and ink and uniformly distributed in said color developer, and a second type of microcapsules filled with one of a second leuco-compound-based dye and ink and uniformly distributed in said color developer, said color developer exhibiting a predetermined thermal melting point,
- wherein said first type of microcapsules exhibits a first pressure-breaking characteristic so as to be squashed and broken under a first predetermined temperature higher than said predetermined thermal melting point and a first predetermined pressure when said color developer is thermally softened or melted, and
- wherein said second type of microcapsules exhibits a second pressure-breaking characteristic so as to be squashed and broken under a second predetermined temperature higher than said first predetermined temperature and a second predetermined pressure lower than said first predetermined pressure when said color developer is thermally softened or melted.
Dependencies are inferred from the claim text.