Chunghwa Picture Tubes, Ltd.

Der-Jyh Chang

Chun-Hsien Yeh

Kuo-Cheng Chen

In a cathode ray tube (CRT) having a glass envelope with a neck portion, a funnel portion and a display screen, or front panel, an electron gun disposed in the CRT's neck portion has a plurality of aligned electrodes, including a charged shield cup. The shield cup includes a plurality of contact springs disposed about the outer periphery thereof and engaging a conductive layer on the inner surface of the CRT's neck portion for supporting the electron gun and charging the shield cup to an electron accelerating, or anode, voltage. Also disposed on the outer periphery of the shield cup and engaging the inner conductive layer is a getter support member. To provide a zero resultant force applied to the shield cup by the three contact springs and the getter support member and maintain the electron gun coaxial with the CRT's centerline, the thickness or strength of the contact springs is established such that the resultant force of the contact springs on the shield cup provides a reaction force to, and compensates for, the force exerted by the getter support member on the shield cup.

Growing community of inventors

Taipei, Taiwan

Der-Jyh Chang