The image orthicon (10) was developed during World War II to solve some of the problems of its predecessors in the camera-tube family. These included. Image orthicon definition, a camera tube, more sensitive than the orthicon, in which an electron image generated by a photocathode is focused on one side of a. Historical information about the start of the first television camera tubes. The huge 4,5″ EEV Image Orthicon with in front a 2/3″ Vidicon tube. This EEV.

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The remaining electrons are then deflected back into the anode, [43] [47] captured by a special grid[83] [84] [85] or deflected back into an electron multiplier. The target is constructed of a mosaic of electrically isolated metallic granules separated from a common plate by a thin layer of isolating material, so that the positive charge resulting from the secondary emission is stored in the granules.


Flemingand Hans Busch gave a complete mathematical lrthicon in Photoconductive It has three section: Principles of Operation Schematic arrangement of the 4. The result is an image painted in positive charge, with the brightest portions having the largest positive charge.

We think you have liked this presentation. On the other side of the ocean, the RCA team led by Albert Rose began working in on a low-velocity scanning beam device they dubbed the orthicon. The resultant current was dependent on the brightness of the image on the target. This differs from the size of the sensitive area of the target which is typically two thirds of the size of the overall diameter.

The return beam, comprising electrons which are not required for neutralising the charge on the target, travels back along approximately the same path as the outgoing electron beam and is directed into a five-stage electron multiplier where it is amplified to become the output video signal.

By using a Pyroelectric material such as Triglycene Sulphate TGS as imagd target, a vidicon sensitive over a broad portion of the infrared spectrum.

Video camera tube

Now the electron beam again starts scanning the photoconductive side of the film but this time the charge deposited by the beam in order to reduce its potential towards zero cathode potential will vary with time. These secondary electrons are collected by a wire-mesh screen, which is located in front of the target on the image side and is maintained at a slightly higher potential with respect to the target.

Visible light is only a small portion of this spectrum. Retrieved July 9, The image formed by the lens is split into three images by means of glass prisms. Archived from the original on Proceedings of the Physical Society.

Image orthicon | Define Image orthicon at

The target plate is made of a very thin sheet of glass and can store the charge received by it. The inside of tuhe glass face plate at the front is coated with a silver antimony coating sensitized with cesium, to serve as photocathode.

Proceedings of the Royal Society of London. Fast as a movie camera. Originally developed by Toshiba in as chalniconPasecon is a registered trademark of Heimann GmbH from Encyclopedia of Television, second edition.

The variation of resistance at each point across the surface of the material is utilized to develop a varying signal by scanning it uniformly with an electron beam. In a conventional magnetically deflected CRT, such as in a TV receiver tueb computer monitor, basically the vertical deflection coils are equivalent to coils wound around an horizontal axis. The original iconoscope was noisy, had a high ratio of interference to signal, and ultimately gave disappointing results, especially when compared to the high definition mechanical scanning systems then becoming available.

It is very costly camera tube and life time of this camera tube is nearly to hrs.

The construction of a plumbicon camera tube is similar to that of a standard vidicon except for the target material. Capacitor types Ceramic resonator Crystal oscillator Inductor Parametron Relay reed relay mercury switch. Step to home television. Proceedings of the Institute of Radio Engineers. The phenomenon known as magnetic focusing was discovered by A. CBS Labs invented the first outboard edge enhancement circuits to sharpen the edges of Plumbicon generated images.