Masakazu Fukushima

Saturation of Zn2SiO4 : Mn luminescence under intense vuv excitation

Output luminescence of Zn2SiO4 : Mn phosphor saturates under intense vacuum ultraviolet radiation having a relatively high excitation duty ratio. The saturation is attributed to the depletion of activators at the ground level. This depletion originates from the long decay time constant of the phosphor. The saturation mechanism is explained analytically using a simple model, and the conditions for efficient phosphor excitation are derived.

A flat gas-discharge panel TV with good color saturation

A flat 8-in diagonal gas-discharge color-TV has been fabricated and operated at 5 fL in white with a luminous efficiency of 0.05 lm/W. The contrast ratio was measured at better than 300:1, owing to the special configuration of the discharge cell, and also the careful adjustment of gas loading conditions. The CIE chromaticity coordinates for red, green, and blue (R,G,B) exhibited in the panel were, respectively, (0.56,0.31), (0.22,0.68), and (0,17,0.14)-- reasonably good values considering those of NTSC. The electrical and optical properties of the panel as well as the techniques for real-time TV picture display are discussed.

A positive column discharge memory panel for color TV display

The dc gas-discharge display panel introduced combines internal memory characteristics with the positive column discharge, yielding high luminance and efficiency. The nature of the memory function is based on shifts in the discharge path between display and auxiliary discharge spaces. Because of this operating principle, the panel has a switching time as fast as 10 µs, enabling use of the panel for real-time color TV displays with 64 gray levels.

A DC gas-discharge display panel for automobiles

A simple color instrument panel has been developed for automobile use that has a self-scanning function realized through a dc gas discharge. The panel, 120 mm × 270 mm × 5 mm in size, includes four separate bar graphs for the speedometer, tachometer, fuel gauge, and temperature gauge, as well as two digitmeters for the speedometer and odometer or trip distance display. Turn signals are also displayed. During fabrication of the panel all electrodes are screen printed simultaneously on a glass substrate using conductive ink. The anode and cathode electrodes are arranged reciprocally, and are connected to two busses and to two or four busses, respectively. Phosphors for the color display are deposited on nonglare front glass and are excited by UV radiation emitted by a negative glow discharge in a mixture of He + Xe.

Electrostatic focusing and electrostatic deflection systems with reduced aperture aberrations

Electrostatic focusing and electrostatic deflection (SS) electron beam systems have been investigated to increase the resolution of SS camera tubes. SS camera tubes have pattern electrodes formed on their inner walls. The pattern electrodes comprise deflection electrodes and a cylindrical electrode. The deflection electrodes form a band around the inner wall at one end of the tube. Four leads project longitudinally from this band, dividing the cylindrical electrode into four parts. An octopole lens is created around the leads of the deflection electrodes. To increase tube resolution, the electron optical characteristics were evaluated, taking into account the effects of the octopole lens. It was revealed that, due to the octopole lens, the aberration spot is not isotropic and its diameter is about three times that produced by a cylindrical lens. New pattern electrodes with zig‐zag shaped leads were devised. It was found that the aberration spot became almost round and its diameter was reduced to the value...

High-efficiency, high-luminance gas-discharge mode for color TV display

High-efficiency and high-luminance are obtained at the transition from Townsend discharge to normal glow discharge, i.e., at subnormal glow discharge mode. Also found is that efficiency increases with shorter pulse duration tA and is inversely proportional to the mean discharge current. On the contrary, luminance increases by shorterning tA and has a maximum. Experiments are carried out with short pulsed voltage ranging from 20 to 1000 ns.

A DC-Gas Discharge Display Device for Data Information Systems

A very simple flat display device is presented for data information systems. This device has a self-scanning function achieved through a dc gas-discharge. The display panel for this device consists of two glass plates; anodes are formed on one plate and a black film and cathodes on the other. The anodes and cathodes are perpendicular to each other and are separated by the barriers formed in parallel between the anodes. All fabrication steps are performed by using screen-printing technology. The cathodes are connected to 32 busses and a time serial 32-phase pulse voltage is applied. Conversely, continuous scan and display pulse voltages are applied for a self-scanning operation and an information dispaly, respectively, to each anode.

Magnetic Focusing and Electrostatic Deflecting Camera Tubes with Twisted Pattern Yokes

Curved Arrow型パターンヨークの作る偏向電界を変数分離法を用いて求め, MS型撮像管のツイスト角および電子銃部近傍に設けた無偏向部分の最適条件について検討した.従来報告されているツイスト角は0°あるいは90°のもののみであったが, 今回の解析結果では30。近くで偏向収差に基づく電子ビームの広がりが最小となり, 解像度一様性を従来より向上できることが明らかになった.また, 無偏向部分の付加は中心解像度の向上に有効であることがわかった.解析に基づいて開発した2/3インチMS型撮像管は良好な解像度特性を示し, 諸特性の解析値と測定値が良く対応した.このことによって, MS型撮像管の最適化設計条件を確立することができた.