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Iconoscopes and their successors accumulate energy on the target continuously, thereby integrating energy over ee. Archived from the original on The holes may also be square for greater precision.

By using this site, you agree to the Terms of Use and Privacy Policy. Simple calculations show that, for equally sensitive photosensitive receptors, the iconoscope is hundreds to thousands of times more df than the disk or the Farnsworth scanner. By spinning the disk rapidly enough, the object seems complete and capturing of motion becomes possible.

The device is a mechanically spinning disk of any suitable material metal, plastic, cardboard, etc. Views View Edit History. Summary [ edit ] Description Disco nipkow I, the copyright holder of this work, hereby publish it under the following license:.

Retrieved 28 April These holes are positioned to form a single-turn spiral starting from an external radial point of the disk and proceeding to the center of the disk. A simple acquisition device can be built by using an electrical motor driving a Nipkow disk, a small box containing a single light-sensitive electric element and a conventional image focusing device lens, dark boxetc.

If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. This page was last edited on 15 Julyat Television technology History of television German inventions in science in Germany.


Nipkow disk

Please help improve nipkkw article by adding citations to reliable sources. From Wikimedia Commons, the free media repository. Further disadvantages include the non-linear geometry of the scanned images, and the impractical size of the disk, at least in the past. Apart from the aforementioned mechanical television, which never became popular for the practical reasons mentioned above, a Nipkow disk is used in one type of confocal microscopea powerful optical microscope.

A Nipkow disk sometimes Anglicized as Nipkov disk; patented inalso known as scanning diskis a mechanical, rotating, geometrically operating image scanning device, patented in by Paul Gottlieb Nipkow.

The timestamp is only as accurate as the clock in the camera, and it may be completely wrong. When spinning the disk while observing an object “through” the disk, preferably through a relatively small circular sector of the disk the viewportfor example, an angular quarter or eighth of the disk, the object seems “scanned” line by line, first by length or height or even diagonally, depending on the exact sector chosen for observation.

This can be intuitively understood by covering all of the disk but a small rectangular area with black cardboard which stays fixedspinning the disk and observing an object through the small area.

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The size of the reproduced image is again determined by the size of the disc; a larger disc produces a larger image.

The patterns may or may not partially overlap, depending on the exact construction of the disk. This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it.

Nipkow disk – Wikipedia

From Wikipedia, the free encyclopedia. Nipkow disk template with 24 holes and window.

Retrieved from ” https: Disk scanners share a major limitation with the Farnsworth image dissector. The scanning disk can be replaced by a polygonal mirror, but this suffers from the same problem — lack of integration over time. Unsourced material may be challenged and removed. This page was last edited on 28 Novemberat However the maximum number of scanlines is much more limited, being equal to the number of holes on the disk, which in practice ranged from 30 towith rare hole disks tested.


By using this site, you agree to the Terms of Use and Privacy Policy. When the disk rotates, the holes trace circular ring patterns, with inner and outer diameter depending on each hole’s position on the disk and thickness equal to each hole’s diameter. This file is made available under the Creative Commons CC0 1.

Disco de Nipkow

Another advantage is that the receiving device is very similar to the acquisition device, except that the light-sensitive device is replaced by a variable light source, driven by the signal provided by the acquisition device. The person who associated a work with this deed has dedicated the work to the public domain by waiving all of his or her rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law.

Another drawback of the Nipkow disk as an image scanning device: Retrieved from ” https: So the ideal Nipkow disk should have either a very large diameter, which means smaller curvatureor a very narrow angular opening of its viewport. Another way to produce acceptable images would be to drill smaller holes millimeter or even micrometer scale closer to the outer sectors of the disk, but technological evolution favoured electronic means of image acquisition.

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