| 摘要 |
PROBLEM TO BE SOLVED: To prevent bulb spacers from being prostrated in the tube axial direction and to increase the diameter of an electron gun structure as far as the inner diameter of a bulb neck permits by adding rigidity increasing means to the leg sections of the bulb spacers having a spring action at fold sections and holding an electron gun on a bulb neck inner face. SOLUTION: A plurality of bulb spacers 20 made of a spring material are balanced with each other by their spring forces and fix an electron gun structure 10 in a bulb neck. Embossments 21 are added to the leg sections of the bulb spacers 20. Even when the gap between a bulb neck inner face and the electron gun structure 10 is narrow and strong stress is applied to the bulb spacers 20 from the bulb neck inner face, the leg sections 17 of the bulb spacers 20 have sufficient rigidity, thus most of the stress is absorbed by the springs of the tip fold sections of the bulb spacers 20, the leg sections 17 of the bulb spacers 20 are not warped, and the bulb spacers 20 are prevented from being prostrated in the tube axial direction to approach an electron beam orbit.
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