Photocopier

Wall Art and Photo Gifts from Science Photo Library

Photocopier

Photocopier in an office. Photocopiers produce black-and-white copies of documents. The document is placed on top facing down. Beneath is a positively charged photoconductive drum. A powerful light scrolls across the document. Photons are only reflected back from the light areas. These hit the drum. Because of its photoconductive properties, the drum loses the positive charge in those areas which are hit. So only the parts corresponding to dark areas on the paper remain positively charged. A fine, black negatively-charged powder called toner is added, which adheres to the positively charged areas. Paper is rolled over this and heated so that it bonds to the toner. A copy is made

Science Photo Library features Science and Medical images including photos and illustrations

Media ID 6468339

© ANDREW LAMBERT PHOTOGRAPHY/SCIENCE PHOTO LIBRARY

Book Copying Off Ice Printing Photocopier

EDITORS COMMENTS
This print from Science Photo Library showcases the intricate workings of a photocopier in an office setting. The image captures the essence of industrial technology and printing, shedding light on the fascinating process behind creating black-and-white copies of documents. In this snapshot, we witness the document being placed face down on top of a positively charged photoconductive drum. As a powerful light scrolls across the document, photons are reflected back only from the lighter areas. These photons then hit the drum, causing it to lose its positive charge in those specific regions. Consequently, only parts corresponding to dark areas on the paper remain positively charged. To complete this remarkable transformation, fine black toner powder with negative charges is added onto these positively charged areas on the drum. The toner adheres precisely to these sections, forming an exact replica of what was initially placed on top. The final step involves rolling paper over this toned drum and applying heat so that it bonds securely with the toner particles. Through this meticulous process, a perfect copy is created before our eyes. This awe-inspiring photograph encapsulates both artistry and innovation within one frame – showcasing how technology seamlessly merges with everyday tasks like photocopying in today's modern world.

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