Matsushita Electric Industrial Co., Ltd.

Matsushita Toshiba Picture Display Co., Ltd.

Hiroji Morimoto

Katsuyo Iwasaki

Koji Nishiyama

Kenichiro Taniwa

Akira Satou

Yasufumi Wada

Akira Hayashi

Keiji Matsuo

A plurality of magnet rings for correcting a convergence are arranged in a tube axis direction with spacers interposed therebetween, on an outer circumferential surface of a neck. A velocity modulation coil for modulating a scanning velocity in a horizontal direction of an electron beam is placed so that a position of the velocity modulation coil in the tube axis direction is overlapped with those of the magnet rings. At least one of the spacers is made of only a magnetic substance. Alternatively, at least one of the spacers is made of a magnetic substance, and the outermost surface in a radius direction of the spacer made of a magnetic substance is covered with a non-metallic material. Because of this, the magnetic field formed by the velocity modulation coil can be intensified without disturbing the magnetic field of the magnet rings of a CPU.

Cathode-ray tube apparatus with magnetic spacers between magnetic rings

A deflection coil for deflecting an electron beam emitted from an electron gun is provided outside a cathode-ray tube in which the electron gun is housed, and a phosphor screen is formed. The cathode-ray tube further includes a velocity modulation coil for modulating a horizontal scanning velocity of an electron beam, a first magnetic substance surrounding an outer circumference of the cathode-ray tube from outside the velocity modulation coil, and a second magnetic substance surrounding the outer circumference of the cathode-ray tube between the deflection coil and the first magnetic substance. Because of this, the sensitivity of velocity modulation can be enhanced effectively with a simple configuration while deflection distortion is prevented.

Cathode-ray tube apparatus

A focusing electrode and a final accelerating electrode accommodate, respectively, a first and a second field forming electrode in positions set back from a first and a second aperture of their end faces opposed to each other. The first and the second field forming electrode have three electron beam passage apertures disposed in an in-line arrangement. When the in-line direction is an X-axis direction, a direction perpendicular to the in-line direction is a Y-axis direction and the center of a central electron beam passage aperture formed in the first field forming electrode is X&equals;0 and Y&equals;0, the central electron beam passage aperture has a shape that passes through the intersection points of the X-axis and the Y-axis with a curve represented by the equation (X/R1) &plus;(Y/R2) &equals;1 (where R1 and R2 are constants) and that has an area smaller than the area encircled by the curve.

In-line type electron gun and color picture tube apparatus using the same

An inline electron gun and a color cathode ray tube provided with the inline electron gun for reducing the manufacturing cost for an assembly jig of the electron gun, for example, that might be generated with a change in the size of the cathode ray tube and for realizing a favorable static convergence property is provided. The inline gun includes a first flat plate electrode, a second flat plate electrode, two cylindrical electrodes at least is used. An opening geometry of outer passage holes provided in the first flat plate electrode and the second flat plate electrode is configured by combining an inner curve and an outer curve, which have different degrees. The opening geometries of the outer passage holes are symmetric with respect to a line. At least one of the outer curves and the inner curves in the outer passage holes have different degrees.

Inline electron gun and color cathode ray tube

A cathode-ray tube comprising an electron gun ( ) disposed in the neck portion ( ) of a funnel ( ), a deflection yoke ( ) having a horizontal deflection coil ( ) and a vertical deflection coil ( ) mounted on the outer surface of the funnel ( ) in a position closer to the front panel than the electron gun ( ), and a speed modulation coil ( ) mounted on the outer surface of the neck portion ( ). The speed modulation coil ( ) is so disposed that the end part thereof on the front panel side is closer to the electron gun ( ) than the end part of the horizontal deflection coil ( ) facing the electron gun ( ) and closer to the front panel side the end part of the electron gun ( ) facing the front panel. A desired speed modulation effect can be attained because the speed modulation magnetic field ( ) of the speed modulation coil ( ) does not interfere with the deflection magnetic field and can be prevented from disappearing by causing by causing an eddy current in a top unit ( ).

Growing community of inventors

Kashihara, Japan

Hiroji Morimoto