| 摘要 |
A grid for use in a linear electron beam tube such as an IOT or TWT includes a g rid section 3 and a focus electrode 4 between which is included an accommodation por tion 5. The grid is mounted in the tube by a mounting flange 6 around its outer peripher y. During use, the grid section 3 becomes hot and consequently expands but the mounting fl ange 6 remains relatively cool being connected to a relatively massive structure. Thin flexible strips 9 of the accommodation section 5 permit movement between the mounting flange 6 a nd the grid section 3 due to differential thermal expansion, thus minimising distortion to the grid section which might otherwise occur if it were connected directly to the mountin g flange 6 and hence fixed in its outer diameter length.
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