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.

Author: Dagal Fenrijora
Country: Bolivia
Language: English (Spanish)
Genre: Politics
Published (Last): 11 April 2018
Pages: 251
PDF File Size: 18.30 Mb
ePub File Size: 5.13 Mb
ISBN: 873-7-22664-984-3
Downloads: 58645
Price: Free* [*Free Regsitration Required]
Uploader: Dukree

January 10,p. The side of this film facing cathode is coated with a very thin layer of photoconductive material amorphous selenium. Unsourced material may be challenged and removed.

Early sensors were of lower resolution and performance than picture tubes, and were initially relegated to consumer-grade video recording equipment.

A sharply focused beam of electrons a cathode ray is generated by the electron gun at ground potential and accelerated by the anode the first dynode of the electron multiplier around the gun image orthicon camera tube a high positive i,age approx.

If the three levels were the same, then that part of the scene was green. A image orthicon camera tube to solid-state image sensors rendered much of that equipment and the investments behind it obsolete and required new equipment ogthicon to work well image orthicon camera tube solid-state sensors, just as the old equipment was optimized for tube-sourced video.

Those entities had a substantial investment in not imate tube cameras, but also in the ancillary equipment needed to correctly process tube-derived video. This comment has been removed by a blog administrator.

Its surface consists of selenium with trace amounts of arsenic and tellurium added SeAsTe to make the signal more stable.

Please help improve this section by adding citations to reliable sources. Museum of the Broadcast Television Camera.

TOP Related Articles  3407F EBOOK DOWNLOAD

Draw and explain image orthicon camera tube in detail with advantages and disadvantages.

At this point the electrons lose speed and get deflected by image orthicon camera tube horizontal and vertical deflection coils, effectively image orthicon camera tube the target. In a magnetically focused camera tube there are electrostatically focused vidiconsthe vertical deflection coils are above and below the tube, instead of being on both sides of it.

The life and times of A D Blumlein. The beam is focused at the target by the magnetic field of the external focusing coil and the electrostatic field of the wall coating grid No. The optical system of the image dissector focuses an image onto a photocathode mounted inside a high vacuum.

Image orthicon

Since the plate is thin, this charge pattern also appears on the other side away from screen of the plate. The secondary emission at the target produces a pattern of positive charges corresponding image orthicon camera tube by point with the light distribution of the original scene camers the thinness of the target allows this charge pattern to be reproduced immediately on its reverse side, i.

The super-Emitron is a image orthicon camera tube of image orthicon camera tube image dissector and the Emitron. United States Patent Office. The latter is essentially a magnetic lens ; it focuses the “crossover” between the CRT’s cathode and G1 electrode, where the electrons pinch together and diverge again onto the screen. Light from the scene to be televised is focused on the photocathode surface by a lens system and the optical image thus formed results in the release of electrons from each point on the photocathode in proportion to the incident light intensity.

Resolution of the order of lines can be achieved under practical conditions. Retrieved March 25, The resultant signal was immune to most extraneous signal “crosstalk” from other parts of the target, and could yield extremely detailed images.


For descriptive purposes, the tube may be divided into three ca,era, the image image orthicon camera tube, the scanning section and the multiplier section, as shown above.

This configurations allows the use of a straight camera tube, because the scene to be transmitted, the charge storage plate, and the electron gun can be aligned one after the other.

File:Image orthicon (superorthicon) scheme.png

While the iconoscope and the intermediate orthicon used capacitance between a multitude of small but discrete light sensitive collectors and image orthicon camera tube isolated signal plate for reading video information, the image orthicon employed direct charge readings from a continuous electronically charged collector. Julian—Gregorian uncertainty CS1 errors: John Wiley orthicob Sons.

Thus the target behaves as a capacitor in series with PIN diode. Once it exits the electron gun, its inertia makes the beam move away from the dynode towards the back side of the target. An image of the scene to be televised is focused by an optical lens lrthicon on to the photo-cathode and image orthicon camera tube photo-electrons to be emitted.

Video camera tube – Wikipedia

September 5,p. The beam is aligned with the focusing magnetic field by means of a small transverse magnetic field image orthicon camera tube by external coils located at the gun end of the focusing coil. This tube is a combination of the image dissector camea the Emitron.

Focusing a tube with this kind of coil is simply a matter of trimming the coil’s current.