Image orthicon definition is – a camera tube that is similar to the iconoscope or the orthicon and uses secondary emission and electron multiplication to produce . 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. Define image orthicon. image orthicon synonyms, image orthicon pronunciation, image orthicon translation, English dictionary definition of image orthicon. n.
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In detail, coils in a deflection othicon extend some distance beyond the neck of the tube, and lie close to the flare of the bulb; they have a truly distinctive appearance.
This tube is a combination of the image dissector and the Emitron.
Although the optical format size bears no relationship to any physical parameter of the sensor, its use means that a lens that would have been used with say a four thirds inch camera tube will give roughly the same angle of view when used with a solid-state sensor with an optical format of four thirds of an inch.
While the electrons are traveling, the helices essentially don’t matter. An orticon orthicon camera can take television pictures by candlelight because of the more ordered light-sensitive area and the presence of an electron multiplier at the base of the tube, which operated as a high-efficiency amplifier.
The screen potential limits the excursion of the target and ensures complete stability at all light levels. It was also easier to manufacture and produced a very clear image. Only one tube was used in the camera, instead of a tube for each color, as was standard for color cameras used in television broadcasting. The beam irthicon aligned with the focusing magnetic field by means of a small transverse magnetic field produced by external coils located at the gun end of the focusing coil.
It also has a logarithmic light sensitivity curve similar to the human eye. The photosensitive target in these tubes suffered from the limitation that the light ortjicon had to rise to a particular level before any video output resulted. Retrieved July 9, A review of some television pick-up tubes.
Image Orthicon | Definition of Image Orthicon by Merriam-Webster
Proceedings of the Physical Society. The light came from either an illuminator mounted around the target, or in more professional cameras from a light source on the base of the tube and guided to the target by light piping.
The latter consists of a thin glass disc with a fine mesh screen mounted very closely to it on the photo-cathode side. This differs from the size of the sensitive area of the target which is typically two thirds of the size of the overall diameter. Views Read Edit View history. Afterand the introduction of the diode-gun Plumbicon tube, the resolution of both types was so high, compared to the maximum imgae of the broadcasting standard, that the Saticon’s resolution imave became moot.
He’s making a quiz, and checking it twice As a result, the Trinicon featured a larger dynamic range of operation. This is maintained at a potential a few volts positive with respect to the wall coating.
Video camera tube
The output from the detector is an electric current whose magnitude is a measure of the brightness of the corresponding area of the image. Thus the contributing images could be separated without any reference electrodes in the tube. We all scream for The multiplier also permits the use of an external amplifier of lower gain.
Retrieved from ” https: Each photosensitive granule constitutes a tiny capacitor that accumulates and stores electrical charge in response to the light striking it. A description of a CRT imaging device also ortyicon in a patent application filed by Edvard-Gustav Schoultz in France in Augustand published in although a working device was not demonstrated until some years later.
Multiplier Section 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.
Ortnicon 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.
Electrons inside these long focus coils take helical paths as they travel along the length of the tube. At this point the electrons lose speed and get deflected by the horizontal and vertical deflection coils, effectively scanning the target.
The fluctuating voltage coupled out to a video amplifier can be used to reproduce the scene being imaged. Proceedings of the IRE, volume 27, issue 9. Definition of image orthicon. 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 multiplier gives an overall multiplication from the five stages of between and 2, The target end of the wall coating grid No.