fénymásolás

Fénymásolás, also known as photocopying or xerography, is a reproduction process that produces a quick copy of a document or image using a light source and a toner-based electrophotographic technology. The process typically involves a heated roller that melts the toner onto the paper, creating a permanent copy. This technology was invented by Chester Carlson in 1938 and commercially introduced by Xerox in the 1950s.

The basic principle of fénymásolás relies on the property of photoconductivity, where certain materials become electrically conductive when exposed to light. In a photocopier, a light source illuminates the original document, and the reflected light is projected onto a charged drum coated with a photoconductive material. Areas of the drum that correspond to dark or inked areas on the original document remain uncharged, while areas corresponding to white or blank spaces become discharged.

A fine, charged powder called toner is then attracted to the charged areas of the drum. When a sheet of paper is rolled over the drum, the toner adheres to the paper. Finally, the toner on the paper is fused into place by heat and pressure, creating a permanent copy of the original document. Fénymásolás has become an indispensable tool in offices, schools, and homes for its speed and convenience in replicating documents.