A sectional view of an image orthicon is shown in the below figure. It has three main sections: image section, scanning section and electron. In television: Electron tubes such as the Orthicon, the Image Orthicon, and the Vidicon. The operation of the camera tube is based on the photoconductive. A video imaging system utilizing a high sensitive image orthicon camera tube has been set up and applied to x‐ray diffraction topography using the.

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TV Camera Tubes | Question and Answer

The later Vidicon tube and its descendants see below do not exhibit this effect, and so could not be used for broadcast purposes until special “detail correction” circuitry could be developed. The electron image produced at the photocathode is made to move towards the target plate located at imagd short distance from it.

The multiplier also permits the use of an external amplifier of lower gain. Any vacuum tube which operates using image orthicon camera tube focused beam of electrons, ” cathode rays “, is known as a cathode ray tube CRT.

Secondary electrons are produced by the impact of the photo-electrons image orthicon camera tube the target and these are collected by the fine mesh screen which is held at a definite small positive potential with respect to the target.

The image orthocon tube was at one point colloquially referred to as an “Immy”. Successive stages of the electron multiplier are camrra symmetrically around and back of the first stage.

An International History of the Formative Years. It will be appreciated that when the beam moves from a less positive portion of the target to a more positive portion, the signal output voltage across the load resistor changes in the positive direction. Due to its wide spectral responseit is labelled as panchromatic selenium vidiconhence the achronym ‘pasecon’. These reflected electrons return down the cathode image orthicon camera tube tube toward the first dynode of the electron multiplier surrounding the electron gun which is at high potential.


While still a part of Philips, the company purchased EEV’s English Electric Valve lead oxide camera tube business, and gained a monopoly in lead-oxide tube production. As a result, potential at every point on the photoconductive side will vary. Its surface consists of cadmium selenide trioxide CdSeO 3. The result is expressed in inches and is usually though not always rounded to a convenient image orthicon camera tube – hence the approximation.

The alignment coils are for initial adjustment of the direction of electron beam. Therefore secondary electrons are attracted to the dynodes at progressively higher positive potentials; five stages image orthicon camera tube multiplication lmage used.

On the other hand, inZworykin shared some patent rights with the German licensee company Telefunken.

Image orthicon

Zworykin, who describes it at Chicago. John Wiley and Sons. The target is nearly at ground potential with a small positive charge, thus when the electrons reach the target at low speed they are absorbed without ejecting more electrons.

The other types had semiconducting targets which did not have this problem. These are not to be confused with the extension tubes used for close-up photography in hand held cameras.

The type of electrode used for the measurements depends The center think local image orthicon camera tube of one of those helices is like a line of force of inage magnetic field.

The entire electron image is deflected and a scanning aperture permits only those electrons emanating from a very small area of the photocathode to be captured by the detector at any given time. In Junethe scientific journal Nature published a letter in which Alan Archibald Campbell-Swintonfellow of the Royal Famera UKdiscussed how a fully electronic television system could be realized by camega cathode ray tubes or “Braun” tubes, after iage inventor, Karl Braun as both imaging and display devices.

English Electric Valve Company, January Light from the scene to be televised is focused on the photocathode surface by a lens image orthicon camera tube and acmera optical image thus formed results in the image orthicon camera tube of electrons from each point on the photocathode in proportion to the incident light intensity.


European Patent Office, Patent No. The number of reflected electrons is a linear measure of the target’s original positive charge, which, in turn, is image orthicon camera tube measure of brightness. The grid 4 voltage is adjusted to produce uniform deceleration of electrons for the entire target area.

As indicated in the figure, positive accelerating potentials of 80 to volts are applied to grid 2, grid 3, and grid 4 which is connected internally to the metalized conductive coating on the inside wall of the tube. A tubee focused beam of electrons a cathode ray is generated image orthicon camera tube the electron gun at ground potential and accelerated by the anode the first dynode of the electron multiplier around the gun at a high positive voltage approx.

The tube is shown in figure. Strange from EMI[17] and by H. At a very bright point on a captured image, a great preponderance of electrons is ejected from the photosensitive plate.

File:Image orthicon (superorthicon) – Wikimedia Commons

Previous color stripe systems had used colors where the color circuitry was able to separate the colors purely from the orticon amplitudes of the signals. Thus the contributing image orthicon camera tube could be separated without any reference electrodes in the tube. They had excellent resolution compared to Image Orthicons, but lacked the artificially sharp edges of IO tubes, which caused some of the viewing audience to perceive them as softer.