| 摘要 |
An improved image building apparatus of the type in which a required image is built on a sheet of printing medium by thermally transferring coloring agent on a strip of ink donor medium by means of a printing head. An additional ink donor medium holding means in which a shorter length of ink donor medium than that of a conventional one is spanned between two cores is provided. In the case where there is a requirement for protecting against disclosure of secret items the additionally provided ink donor medium holding means is used to build an image.
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