Patent ID: 6191527
Filing Date: 2001-02-20
Classification: H01J

Abstract:
In a tube filament assembly of the type which includes a filament structure; a weld ring comprising a first surface to which the filament structure is attached and away from which the filament structure extends, with a skirt attached to the outer perimeter of the first surface and extending away from the first surface of the weld ring in a direction opposite from the filament structure; and a filament support means with a cylindrical surface and a top surface transverse to the cylindrical surface, with the cylindrical surface of the filament support means fitting into and attached to the skirt of the weld ring with the top surface of the filament support means located within the skirt, the improvement comprising:a cylinder extending from the top surface of the filament support means, the cylinder located so that it is the part of the filament support means to which the skirt is attached and the cylinder being sufficiently thin and yieldable to counteract the stress developed by differential thermal expansion of the parts and to prevent cracking of the attachment between the support cylinder and the weld ring.