[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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A tri-electrode-vidicon has a target structure comprising a transparent substrate and a plurality of red, green and blue striped optical filters.
This paper gives a theoretical anlysis of the system using the striped filters in complementary colors in order to increase the sensitivity of the tri-electrode-vidicon. It is assumed that the spectral distributions of the sensitivity of the vidicon and the illumination are uniform and that the color separation filters have the ideal characteristics.
As a result of the investigation it is pointed out that the chrominance and luminance signals have to be generated separately to maintain better signal to noise ratio and it is concluded that the combination of the filter striped of yellow, magenta and cyan is the best system for improving the signal to noise ratio, increasing the sensitivity and obtaining the balanced mixing in tri-electrode-vidicon color cameras.

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Resolution and other fundamental characteristics of equi-angular-velocity and constant-line-velocity spiral scanning television systems are compared, and the development of the system as well as the results of the measurement of an experimental spiral scanning closed circuit television system is discussed.
In the experimental system, the scanning beam moves with an equiangular velocity from the periphery of the picture screen towards the center and the spacing between the contiguous scanning lines is fixed.
A 1-inch vidicon tube in the camera and an 8-inch CRT in the monitor are employed, and the pair of deflection coils for each tube are made to have almost the same inductance.
It is found by the measurement that the tangential resolution, i. e. the resolution along the direction of beam scanning, in the central portion of the screen is about 350 lines when the video transmission bandwidth is limited to 900 kHz.

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[in Japanese]

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