Sony Corporation

Koji Ichida

Yasunobu Amano

Yoichi Ohshige

Masahiko Mizuki

Naruhiko Endo

Hideo Tomita

Atsushi Matsuzaki

Satoshi Nakada

Yoshifumi Nakayama

Yuzuru Watanabe

Hiromu Inoue

Satoshi Ohno

A method and apparatus for detecting position deviation of an electron gun in which, by increasing the light utilization efficiency to render the field of sight lighter and by reducing the amount of reflected light from the grid surface, the reflected light from the electron beam emitting surface is lighter to enable an edge of an electron beam transmitting hole to be discerned accurately to detect the position deviation of the electron gun accurately. The linear polarized light is illuminated on the electron gun and the light reflected by this electron gun is observed by a light polarization unit to detect the position deviation between grids of the electron gun.

Method and apparatus for detection position deviation of electron gun

A color cathode-ray tube which increases the degree of freedom in designing its main electron lens, decreases the electron beam spot diameter, and achieves high resolution, in which the between the focusing electrode (15) applied with the focusing voltage (Vf) and the anode electrode (17) applied with the anode voltage (Va), there is provided an intermediate electrode (16) applied with the potential Vm which is higher than the focusing voltage (Vf) and lower than the anode voltage (Va), and the focusing electrode (15). These voltages are set by a dividing resistor (30).

Color cathode-ray tube

To propose a color cathode-ray tube which increases the degree of freedom in designing its main electron lens, decreases the electron beam spot diameter, and achieves high resolution, in which between the focusing electrode (15) applied with the focusing voltage (Vf) and the anode electrode (17) applied with the anode voltage (Va), there is provided the intermediate electrode (16) applied with the potential Vm which is higher than the focusing voltage (Vf) and lower than the anode voltage (Va), and the focusing electrode (15), the anode electrode (17) and the intermediate electrode (16) are respectively formed of cylindrical bodies each having an ellipse cross-section and closed by the electric field correcting electrode plates (25, 26, 27, 28) having three electron beam penetrating portions bored therethrough so as to be arrayed in an in-line fashion.

Color cathode-ray tube with intermediate electrode

An electron gun arrangement for color cathode-ray tubes comprising three cathodes for emitting electron beams, for example, for red, green and blue, and a main electron lens comprising three front electron lenses corresponding to the cathodes, respectively, and a back electron lens common to all the cathodes. Each front electron lens is formed with an aperture smaller than that of the back electron lens and is mounted so as to meet Fraunhofer conditions so that aberration is reduced. Electron beam transmitting apertures are formed in the grids forming the front electron lenses, respectively, with the respective center axes thereof parallel to each other, which makes it easy to manufacture the electron gun arrangement and enables accurate machining during manufacturing.

Electron gun for multigun cathode ray tube

A multi-beam projector incorporates a cathode ray tube for each of the primary colors red, green and blue, with each cathode ray tube having two electron beams, with all of said electron beams being horizontally and vertically deflected in synchronism with each other. Primary color video signals are supplied to one cathode of each cathode ray tube for generating a first beam, and a delayed primary color video signal is supplied to the second cathode of each cathode ray tube for generating a second beam spaced from the first beam by a predetermined interval. The interval spacing between the beam of the cathode ray tube for the blue primary color is wider than the interval between the electron beams for the other cathode ray tubes.

Growing community of inventors

Tokyo, Japan

Koji Ichida