| 摘要 |
A lamp ballast wherein a magnetic core and coil assembly is encased within a housing and is spaced from the housing with a suitable filler material filling the space between the magnetic core and coil assembly and the housing. The magnetic core and coil assembly is suspended within the housing having an open top, being spaced from the sides and bottom thereof by suspension means. The housing or casing is then partially filled with the suitable filler material in liquid form, to a level wherein at least a portion of the magnetic core and coil assembly is immersed in the filler material. After the filler material has hardened to an extent that it will support the core and coil assembly, portions of the suspension means are removed such that when the housing is completely filled with the filler material the core and coil assembly will be completely surrounded by the filler material and the suspension means will not extend from the core and coil assembly to the casing. Thus, the suspension means does not provide a surface joining the casing and the core and coil assembly along which moisture entering the casing may reach the core and coil assembly.
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