Record receiver having plural interactive leaves or a colorless – Having plural interactive leaves
Patent
1990-04-30
1992-12-29
Hess, Bruce H.
Record receiver having plural interactive leaves or a colorless
Having plural interactive leaves
428195, 428913, 428914, B41M 5035, B41M 526
Patent
active
051751399
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of heat transfer printing and a heat transfer sheet for use in the method, and more particularly to an improvement in a method of heat transfer printing in which an image signal is transmitted by a thermal head to a heat migratable dye layer on one surface of a heat transfer sheet, and the heat transfer sheet is pressed against a sheet to which the image is to be printed to heat-migrate the image of the dye of the dye layer to the sheet to which the image is to be printed, and to an improved heat transfer sheet used for the method.
BACKGROUND ART
A method of heat transfer printing and a heat transfer sheet of this kind are disclosed, for example, in U.S. Patent No. 4,650,494. According to this method of heat transfer printing, an excellent monocolor or multicolor image can be formed simply and at high speed on an image receiving sheet to which the image is to be printed, and it is possible to obtain a multicolor image having particularly excellent continuous tone and equal quality to that of a color photograph. The heat transfer sheet to be used for the method of heat transfer printing of this kind is designed so that a dye layer having substantially the same size as the entire shape of the sheet to which the image is to be printed (that is, always constant size irrespective of the size, shape or the like of a portion on which the transferred image is formed) is provided on a substrate film.
However, in the conventional heat transfer sheet, in the case where an image is transferred to an image receiving sheet wherein a portion on which the transferred image is formed is located in a part of the surface of the image receiving sheet (in other words, the image forming portion is disposed locally), the dye layer of the heat transfer sheet is used only for a portion corresponding to the aforesaid image forming portion and other dye layer portions are not used. This is uneconomical, and in addition, the peripheral portion of the formed transferred image is contaminated by the unused portion of the dye layer.
The present invention has been accomplished in order to overcome the aforementioned problem. It is an object of the present invention to provide a method of heat transfer printing, which can minimize occurrence of a wasteful dye layer portion even when the image is transferred to the image receiving sheet whose image forming portion is disposed locally, and the peripheral portion of the transferred image is not contaminated. The present invention further provides a heat transfer sheet used for the method.
DISCLOSURE OF THE INVENTION
According to the present invention, there is provided a method of heat transfer printing in which a heat transfer sheet is provided which comprises a substrate film and heat migratable dye layers of at least one color, provided on one surface of said substrate film, the dye layer of the heat transfer sheet is heated according to an image signal, and the heat transfer sheet is pressed against a printing sheet to which an image is to be printed to heat-migrate the image of the dye of the dye layers to the printing sheet, characterized in that each of the dye layers is provided in a specific local area of the substrate film, corresponding to a local area of the printing sheet in which the image is to be formed, and the dye of the dye layers is migrated to the local area of the printing sheet.
According to another aspect of the present invention, there is provided a heat transfer sheet in which heat-migratable dye layers of at least one color are provided in a spaced relation on one surface of a substrate film, characterized in that the dye layers are provided in a specific local area of the substrate film corresponding to a local area of a printing sheet in which an image is to be formed.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view showing one embodiment of a heat transfer sheet according to the present invention;
FIG. 2 is a sectional view taken on line II--II of FIG. 1;
FIGS. 3 to 6 are respectively pl
REFERENCES:
patent: 4021591 (1977-05-01), De Vries et al.
Ando Jitsuhiko
Nakamura Masayuki
Oshima Katsuyuki
Dai Nippon Insatsu Kabushiki Kaisha
Hess Bruce H.
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