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The scanning disk can be replaced by a polygonal mirror, but this suffers from the same problem — lack of integration over time. I, the copyright holder of this work, hereby publish it under the following license:.

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, disc least in the past.

So the ideal Nipkow disk should have either a very large diameter, which means smaller curvaturenipjow a very narrow angular opening of its viewport.

Archived from the original on A lens projects an image of the scene in front of it directly onto 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.

Some means of synchronizing the disks on the nkpkow devices must also be devised several options are possible, ranging from manual to electronic control signals. Disk scanners share a major limitation with the Farnsworth image dissector.

Light is conveyed into the sensing system as the small aperture scans over the entire field of view. The size of the reproduced image is nikpow determined by the size of the disc; a larger disc produces a larger image. The acquisition part of the system was not much better, requiring very powerful lighting of the subject. 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.

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

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When spinning the disk while observing an object “through” the disk, preferably through a disoc 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 nipkkow sector chosen for observation.

Another drawback of the Nipkow disk as an image scanning device: Retrieved from ” https: A Nipkow disk sometimes Anglicized as Nipkov disk; patented inalso known as scanning diskis a mechanical, rotating, geometrically operating image scanning device, patented risco by Paul Gottlieb Nipkow.

Nipkow disk – Wikipedia

Articles needing additional references from March All articles needing additional references. This file is made available under the Creative Commons Nkpkow 1. These facts helped immensely in building the first mechanical television accomplished by the Scottish inventor John Logie Bairdas well as the first “TV-Enthusiasts” communities and even disck image radio broadcasts in the s.

However the maximum number of scanlines is much more limited, being equal to the number of holes on the nkpkow, which in practice ranged from 30 towith rare hole disks tested.

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 se scanline timing, and very high scanline resolution.

Description Disco nipkow Retrieved 28 April The person who associated a work with this deed has dicso 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, nopkow the extent allowed by law. 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.

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.

File:Disco nipkow 24.svg

The holes may also be square for greater precision. Nipkow disk template with 24 holes and window. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.

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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. Views Read Edit View history. By spinning the disk rapidly enough, the object seems complete and capturing of motion becomes possible.

The devices using them were also noisy and heavy with very low picture quality and a great deal of flickering. Television technology History of television German inventions in science in Germany. Views View Edit History.

The scanning system simply “picks off” the accumulated charge as it sweeps past each site on the target. This page was last edited on 15 Julyat The device is a mechanically spinning disk of any suitable material metal, plastic, cardboard, etc. The actual amount of light gathered is instantaneous, occurring through a very small aperture, and the net yield is only a microscopic percentage of the incident energy.

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.

Please help improve this article by adding citations to reliable sources. Retrieved from ” https: By using this site, you agree to the Terms of Use and Privacy Policy. From Wikimedia Commons, the free media repository. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Unsourced material may be challenged and removed. From Wikipedia, the free encyclopedia. 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 sensitive than the disk or the Farnsworth scanner.

If the sensor is made to control a light behind a second Nipkow disk rotating synchronously at the same speed and in the same direction, the image will be reproduced line-by-line.