Hi-Vision products have become very popular as the technology has been developed. Consequently, there is a growing demand for a Hi-Vision video camera View-Finder. We have developed a monochrome CRT that can be used as a Hi-Vision View-Finder. In this paper, we will discuss the key technologies of this CRT.
(1) Steps taken to improve resolution.
(a) Improved glass bulb which can take a high voltage.
(b) Improved phosphor screen.
(c) Improved electron gun.
(2) Steps taken to improve circuitry. We have developed :
(a) A wide band video circuit, a stable deflection circuit, and a high-voltage circuit.
(b) A precision beam correction method based on a unique digital circuit.
We have achieved our target specification for this prototype and have confirmed that the CRT can be used for Hi-Vision View-Finder applications.
