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Disco de Nipkow – Wikipedia, a enciclopedia libre

The scanning disk can be replaced by a polygonal mirror, but this suffers from the same problem — lack of integration over time. The resolution along a Nipkow disk’s scanline is potentially very high, being an analogue scan. 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.

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.

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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.

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A lens projects an image of the scene in front of it directly onto the disk. Summary [ edit ] Description Disco nipkow The acquisition part of the system was not much better, requiring very powerful lighting of the subject. Description Disco nipkow The patterns may or may not partially overlap, depending on the exact construction of the disk.

Further disadvantages include the non-linear geometry of the scanned images, and the impractical size of the disk, at disxo in the past. 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. When the disk rotates, the holes trace circular ring patterns, with inner and dixco diameter depending on each hole’s position on the disk and thickness equal to each hole’s diameter.


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From Wikipedia, the free encyclopedia. One of the advantages of using a Nipkow disk is that the image sensor that is, the device converting light to electric signals can be as simple as a single photocell or photodiodesince at each instant only a very small area a pixel is visible through the disk and viewportand so decomposing an image into lines is done almost by itself with little need for scanline timing, and very high scanline resolution.

Articles needing additional references from March All articles needing additional references. 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. Please help improve this article by adding citations to reliable sources.

Nipkow disk

In other projects Wikimedia Commons. Dlsco 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. The devices using them were also noisy and heavy with very low picture quality and a great deal of flickering. By using this site, you agree to the Terms of Use and Privacy Policy. Nipkow disk template with 24 holes and window.

By spinning the disk rapidly enough, the object seems complete dde capturing of motion becomes possible.

This page was last edited on 15 Julyat 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. 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. Simple calculations show that, for equally sensitive photosensitive receptors, the iconoscope is hundreds to thousands of times more sensitive than the disk or the Farnsworth scanner.

The device is a mechanically spinning disk of any suitable material metal, plastic, cardboard, etc. Another serious disadvantage lay with reproducing images at the receiving end of the transmission diisco was also accomplished diaco a Nipkow disk. If the sensor is made to control a light behind a second Nipkow disk rotating synchronously at mipkow same speed and in the same direction, the image will be reproduced line-by-line. So the ideal Nipkow disk should have either a very large diameter, which means smaller curvature nikpow, or a very narrow angular opening of its viewport.


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Disco de Nipkow

The scanning system simply “picks off” the accumulated charge as it sweeps past each site on the target. Unsourced material may be challenged and removed. Retrieved 28 April Light is conveyed into the sensing system as the small aperture scans over the entire field of view. 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.

Some means of synchronizing the disks on the two devices must also be devised several options are possible, ranging from manual to electronic control signals. From Wikimedia Commons, the free media repository. The size of the reproduced image is again determined by the size of the disc; a larger disc produces a larger image.

The holes may also be square for greater precision. This page was last edited on 28 Novemberat Iconoscopes and their successors accumulate energy on the target continuously, thereby integrating energy over time.

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The timestamp is only as accurate as the clock in the camera, and it may be completely wrong. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.

The actual amount of light gathered is instantaneous, occurring through a nipkiw small aperture, and the net yield is only a microscopic percentage of the incident energy.

Retrieved from ” https: These facts helped immensely in building the first mechanical television accomplished nipkoq the Scottish inventor John Logie Bairdas well as the first “TV-Enthusiasts” communities and even experimental image radio broadcasts in the s. Views View Edit History. Retrieved from ” https: Disk scanners share a major limitation with the Farnsworth image dissector.