Matsushita Electric Industrial Co., Ltd.

Matsushita Electronics Corporation

Akira Hayashi

Shigeya Ashizaki

Masao Natsuhara

Hiroji Morimoto

Keiji Matsuo

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 ( ).

Cathode-ray tube

A shadow mask type color cathode ray tube fitted with an in-line type electron gun having a control grid of a quadrupole structure, wherein the control grid has an elongated rectangular hole having a horizontal diameter H and a vertical diameter V wherein the relationship expressed by 1&lt;H/V&lt;1.4 is established.

Growing community of inventors

Suita, Japan

Akira Hayashi