Typewriting machines – Typing by other than type-face or type-die – Thermal
Patent
1998-03-02
2000-01-04
Eickholt, Eugene
Typewriting machines
Typing by other than type-face or type-die
Thermal
40012004, 4002403, 347172, B41J 2325, B41J 3100
Patent
active
060102586
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a picture display system for displaying an image formed on a transparent sheet by light irradiated thereon from its rear surface.
The present invention is also an invention relating to an image forming apparatus for forming a color picture on the transparent sheet used in the picture display system.
The present invention is further an invention relating to an ink ribbon holding ink to be transferred to the transparent sheet by the picture forming apparatus.
BACKGROUND ART
A sublimation type color printer has been proposed which forms a color picture on a transferred medium such as a transparent sheet or the like by sublimating yellow, magenta and cyan inks provided on an ink ribbon by a thermal head. The transparent sheet on which a color picture is formed by the printer is generally a sheet for use in a display apparatus such as an OHP (Overhead Projector) apparatus or the like. This conventional display apparatus is an apparatus which irradiates rays of light from a light source on the transparent sheet from a rear surface thereof to project rays of light representing a picture formed on the transparent sheet on a screen.
It is an object of the present invention to provide a new display system different from such display apparatus. It is also an object of the present invention to provide an ink ribbon and a color printer most suitable for realizing the new display system.
DISCLOSURE OF THE INVENTION
The display system includes an image forming apparatus for forming a color image on a transparent sheet and a display apparatus for displaying the color image formed on the transparent sheet. The above image forming apparatus has a first process for forming a color image layer based on the color image on a rear surface of the transparent sheet by sublimating a dye containing each color components of yellow, magenta and cyan on an ink ribbon, and a second process for forming a white layer on a rear surface side of the color image layer by sublimating a dye having a color component of white on the ink ribbon after the first process. The display apparatus irradiates irradiation light from a rear surface side, where the white layer is formed, of the transparent sheet, and displays the color image on a front surface side of the transparent sheet by making the irradiation light transmit through the white layer and the color image layer.
The image forming apparatus of the display system according to the present invention includes an ink ribbon drive means for driving the ink ribbon, a storage means for storing a tension control data used for controlling a tension of the ink ribbon, and a control means for, based on a tension control data stored in the storage means, controlling the ink ribbon drive means so that tension of the ink ribbon should be set to a first tension value in the first process and controlling the ink ribbon drive means so that tension of the ink ribbon should be set to a second tension value in the second process.
In the display system according to the present invention, the second tension value is larger than the first tension value.
The image forming apparatus of the display system according to the present invention includes a transparent sheet drive means for driving the transparent sheet by one line amount in the first and second processes, and the control means controls the transparent sheet drive means and the ink ribbon drive means so that the white layer should be formed on a rear surface of the color image layer having a uniform thickness.
The image forming apparatus of the display system according to the present invention includes a storage means for storing a first reference head voltage and a second reference head voltage which are to be supplied to the thermal head as a reference head voltage, a head drive means for controlling, based on the image data and the first and second reference head voltages, a head voltage which is to be supplied to the thermal head for sublimating a dye of the ink ribbon, and a control means for contr
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Nishi Yuji
Tomita Seijiro
Umezu Mitsuo
Eickholt Eugene
Maioli Jay H.
Sony Corporation
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