Eiichi Yamazaki

A Segmented Lens for Improving Color Television Dot Patterns

A new segmented lens has been designed and fabricated that is intended to replace a conventional, continuous-surface lens used in making color TV picture tubes. The lens is employed in the lighthouse during the phosphor dot screening process. Using the segmented lens, it has been possible to reduce beam landing errors by more than 50% in the new 110° deflection angle picture tubes. With this lens, the wide-angle tubes should be no more difficult to produce than ordinary 90° tubes, and when it is used in the manufacture of 90° tubes, pictures of unprecedented high quality are made possible.

A new high performance color picture tube the mask-focusing color tube

From a technical point of view improvements of color picture tube could be regarded as having reached their limits. In this respect we have found that the mask focusing tube can achieve this objective when they are combined with the black matrix technique, the high performance gun, dot screen structure, high matrix transparency and large electrode diameter. Two fold improvements of brightness and contrast have been obtained with two fold mask transparency, 22% higher matrix transparency and mask-focusing. 20–30% less deflection power, 70% less mask doming also have been achieved with 110 degree 36.5 mm neck diameter and 1∶2 mask focusing voltage ratio. 20% less spot diameter and sharp beam distribution have been obtained by new multi-stage focusing electron gun and delta arrangement 36.5 mm neck diameter.

Projection Display Series for High-Definition TV

High-definition TV is an expected next generation television broadcasting system, and the broadcast of which will start in 1990 in Japan. The system is also expected for the use of industrial application. For these requirement , 54-inch, 110-inch, and 200-inch projection displays have beep developed. The horizontal resolution of 1000 TV lines, the peak brightness of 410 cd/m2 (54-inch), and the contrast ratio of more than 100 for rear projection displays can be realized by the development of 9-inch dual focusing projection tube, high resolution projection lens, fine pitch high contrast rear screen and large output horizontal deflection circuit etc.

The New Brighter Mask-Focusing Picture Tube and its Peripheral System

In a color TV receiver employing a conventional shadow mask picture tube, only about a quarter of the emitted electron beams are used to energize the phosphor screen. For this reason, we have often experienced insufficient brightness with a large-screen color TV receiver. Phosphor material has been improved and the super black martix system has been devised to increase the brightness. These means, however, do not necessarily produce satisfying results. And if we want a brighter large-screen TV receiver, we must increase the high-voltage power.