Heat sensitive copying machine

Details Heat sensitive copying machine Heat sensitive copying machine

1988-07-22

1990-01-02

Howell, Janice A.

Radiant energy

With infrared or thermal pattern recording

Thermal copying of documents

2503161, 355 41, G03C 566

Patent

active

048915173

ABSTRACT:
A copying machine for making a hard copy of an original comprises an image sensor for reading an image of the original to provide image signals, a memory for memorizing the image signals after or before processing the image signals for necessary corrections, and a printer for printing an image on a copying sheet according to the image signal after image processing. Preferably, a thermal printing head and a heat sensitive sheet are used. The copying machine is compact and either is incorporated in a portable overhead projector or is used as a writing board copy machine. In the former case, the image sensor is disposed in a supporting arm for supporting an image projection lens assembly above a base section of the overhead projector on which a transparent original is placed. The image sensor reads a reflecting original to provide image signals and the thermal printing head prints a mirror image of the reflecting original on a transparent heat sensitive sheet according to the image signals provided by the image sensor, thereby providing a transparent secondary original instantly for projection. In the latter case, the machine includes a pattern projector for projecting a light pattern which will be deformed on the remote original according to position of the copying machine, whereupon a correcting circuit provides a correction signal. The heat sensitive sheet is formed with indicia near front and rear diagonally opposite edges, symmetrically with respect to the center of the sheet, to indicate at least the surface of the sheet to which a heat sensitive material layer is applied.

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