Photocopying – Projection printing and copying cameras – With developing
Patent
1992-08-27
1993-07-27
Hayes, Monroe H.
Photocopying
Projection printing and copying cameras
With developing
355266, 430138, G03B 2732, G03B 2752
Patent
active
052314502
ABSTRACT:
A printer for forming an image by image-wise exposure of a layer of chromogenic microcapsules. The observable image produced in accordance with the present invention may have a three-dimensional topographical structure, such as to form the bumps of the braille alphabet, or to replicate the surface variations and texture of brush strokes of a conventional painting. A locally variable attractive field plate having an operable surface is provided for receiving an image in a layer of chromogenic microcapsules. A plurality of individually controllable attractive field sources are provided, each in operable connection with a corresponding discrete location of the operable surface. Each individually controllable attractive field source is controlled to selectively apply and vary a respective local attractive field associated with each corresponding discrete location of the operable surface. A plurality of field attractive microcapsules are supplied to be attracted to the discrete locations of the operable surface so as to form a layer of field attractive microcapsules having a thickness. The thickness depends on the respective local attractive field associated with each corresponding discrete location of the operable surface. A three-dimensional structure of the layer of field attractive microcapsules having a varying thickness can be formed by selectively applying a different local attractive field at two or more corresponding discrete locations of the operable surface. This three-dimensional structure can be image-wise exposed to form a latent image. Upon developing and curing, an observable image is produced.
REFERENCES:
patent: 4865943 (1989-09-01), Wright
patent: 4996552 (1991-02-01), Sangyoji et al.
patent: 5050531 (1991-09-01), Sakai
patent: 5097286 (1992-03-01), Sakai
patent: 5142337 (1992-08-01), Karidis et al.
Daniels John J.
Hayes Monroe H.
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