أنبوب الفيديكون ذو الثنائي السليكوني الضوئي .. كتاب التلفزيون الملون والعادي

6-2 Videcon tube with a silicon optical diode: This type is distinguished by the fact that the target plate is made of silicon type N - it is small in size (Fig. Infrared, the target plate contains about 30,000 photodiodes. The conductivity of each diode increases with the increase in the light intensity in each A corresponding element in the image, so the passing of the scanning beam over each of them leads to a change in the intensity of the current passing through the image output load resistance, and this change ranges between (4-200 nano Ambien

Export pipe specification model (Plumbecon):

cathode voltage .. volts

The second network voltage is 300 volts

The electrode signal voltage is 45 volts

The voltage of the fourth network is 500 volts

Beam current 150 - 300nA nA Focusing and deflection coils current 12kV Focusing current 120mA (FOCUS)

Line current (P-P) 160mA Frame current (P-P) 25mA

Face surface temperature 20-45 m. Vital current (P-P). Network (1) 50 volts

Darkening current - 1.5 nA gamma or conversion specification 0.050.95

The maximum response is 500 nano farad, the number of lines is 600 TV lines

Note: (-) ie from top to bottom

7-2 The camera tube is a Trinicon type, which is a special type of videocon tubes with a lens diameter of (1 inch) (25 mm) Figure (2) - (18) and gives two signals at the output, namely the luminance signal (Y).

Figure (18-2) A studio camera equipped with a single tube, which produces good images and has a monitoring screen during shooting.
. The color signal is according to the NTSC system. The main difference that distinguishes the Trinicon from the Videocon Figure (2) - (19) - is the target board assembly that consists of: 1 - the front lens for protection only 2 - three color filters 3 - the mask 4 - the indicator pole ( (Index) 5 - The photosensitive layer, which contains (280) filter units (red - green - blue - vertically arranged - and the two most important elements in the target plate are the three-color filters and the indicator pole. The three photofiltration groups separate the incoming image light into Its three primary colors - if we assume that the image color is green only, then the light passes through the green filter lines and only green output signal pulses are generated - and the same thing happens if there is a red or blue color - and in white light the output signal is continuous
The scanning beam scans the target board at a rate of (0.22 microseconds) for each line. This is what corresponds to the frequency (4.5) megahertz in the transmission method (NTSC) and for the compatibility and color synchronization to occur, it forms a reference page difference by means of a square wave generator in each horizontal line, which combines the three color signals in a way that leads to preserving this compatibility and synchronization in sending and receiving. This signal consists of the luminance signal and the color signal